Foam proportion mixing system and fire fighting truck

Abstract

According to the foam proportional mixing system and the fire fighting truck, the water pressure of the outlet of the water pump under the rated working condition corresponds to the property of the corresponding flow, so that the needed water amount can be determined according to the detection result of the pressure sensor, the valve opening degree of the metering valve is adjusted according to the set foam proportion, and the flow of foam is controlled; therefore, the accurate foam mixing proportion can be ensured without arranging a flow meter, and the cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of fire fighting equipment, and in particular to a foam proportioning system and a fire fighting truck. Background Art

[0002] Fire trucks, also known as fire engines, are vehicles designed and manufactured to be suitable for firefighters to ride, equipped with various firefighting equipment or fire extinguishing agents, and used by firefighting forces to extinguish fires, assist in extinguishing fires, or for firefighting and rescue. Fire trucks can transport firefighters to the disaster site and provide them with a variety of tools for performing disaster relief tasks.

[0003] The foam proportioning system is the core part of the fire fighting equipment for producing foam mixture. It ensures that water and foam stock solution are mixed in a precise ratio to generate foam suitable for fire fighting. In order to keep the foam mixing ratio at the set value, the current foam proportioning system usually uses a foam flow meter and a water flow meter to detect the flow of water and foam respectively, and then calculates and controls the real-time flow of water and foam based on the detection results of the foam flow meter and the water flow meter.

[0004] However, since corresponding flow meters need to be configured for water and foam respectively, the cost of the flow meters is relatively high, which leads to an increase in the cost of the entire foam proportion mixing system. Utility Model Content

[0005] The purpose of the present application is to provide a foam proportion mixing system and a fire truck, which can ensure an accurate foam mixing ratio without setting a flow meter, thereby saving costs.

[0006] The embodiments of the present application can be implemented as follows:

[0007] In a first aspect, the utility model provides a foam proportioning system, comprising a water tank, a water inlet pipe, a foam tank, a foam inlet pipe, a water pump, a foam proportioning mixer and a liquid outlet pipe;

[0008] The water tank, the water inlet pipe, the water pump and the liquid outlet pipe are connected in sequence;

[0009] The foam tank, the foam inlet pipe and the foam inlet of the foam proportioning mixer are connected in sequence, and the outlet of the foam proportioning mixer is connected to the water inlet pipe;

[0010] Wherein, the liquid outlet pipe is provided with a pressure sensor, and the foam inlet pipe is provided with a metering valve; the pressure sensor is located at the outlet of the water pump, and the opening of the metering valve can be adjusted according to the detection result of the pressure sensor.

[0011] In an optional embodiment, the water inlet pipe is provided with a rear water inlet valve, and the rear water inlet valve is located on the upstream side of the connection position of the water inlet pipe with the foam proportioning mixer.

[0012] In an optional embodiment, the water tank is provided with an external water injection valve, the foam tank is connected to the foam external injection valve, and the liquid outlet pipe is connected to both the water outlet valve and the gun liquid outlet valve.

[0013] In an optional embodiment, the water inlet pipe is provided with a water suction port valve, and the water suction port valve is located between the connection between the foam proportioning mixer and the water inlet pipe and the inlet of the water pump.

[0014] In an optional embodiment, a foam inlet valve is provided on the foam inlet pipe, and the foam inlet valve is located on the upstream side of the metering valve.

[0015] In an optional embodiment, the water return pipe is connected between the liquid outlet pipe and the water inlet of the foam proportioning mixer.

[0016] In an optional embodiment, the water return pipe is provided with a foam injection valve.

[0017] In an optional embodiment, the return pipe includes a connected main pipe and two branch pipes, the main pipe is connected to the liquid outlet pipe, the two branch pipes are divided into a first branch pipe and a second branch pipe, the first branch pipe is connected to the water inlet of the foam proportioning mixer, the second branch pipe is connected to the water tank, the first branch pipe is provided with the foam injection valve, and the second branch pipe is provided with an internal water injection valve.

[0018] In an optional embodiment, a flushing pipe and a flushing valve arranged on the flushing pipe are connected between the liquid outlet pipe and the foam inlet pipe.

[0019] In an optional embodiment, the connection between the flushing pipe and the foam inlet pipe is located on the upstream side of the metering valve.

[0020] In a second aspect, the utility model provides a fire truck, comprising the foam proportion mixing system described in any one of the aforementioned embodiments.

[0021] Compared with the prior art, the beneficial effects of the embodiments of the present application include:

[0022] By knowing that the outlet water pressure of the water pump under rated working conditions corresponds to the corresponding flow rate, the required water volume can be determined based on the detection result of the pressure sensor, and the valve opening of the metering valve can be adjusted according to the set foam ratio to control the foam flow rate. This way, there is no need to set up a flow meter to ensure an accurate foam mixing ratio, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of a foam proportioning system is provided for an embodiment of the present application.

[0025] Icons: 10-water tank; 11-external water injection valve; 20-foam tank; 30-water inlet pipe; 31-rear water inlet valve; 32-water suction valve; 40-foam inlet pipe; 41-metering valve; 42-foam inlet valve; 43-foam external injection valve; 50-discharge pipe; 51-pressure sensor; 52-gun discharge pipe; 53-water outlet pipe; 54-gun discharge valve; 55-water outlet valve; 60-foam proportioning mixer; 61-water pump; 70-return pipe; 71-main pipe; 72-first branch pipe; 73-second branch pipe; 74-foam ejection valve; 75-internal water injection valve; 80-flushing pipe; 81-flushing valve; 90-fire cannon. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Combine the following Figure 1 , some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] The embodiment of the present application discloses a foam proportion mixing system, which includes a water tank 10, a water inlet pipe 30, a water return pipe 70, a foam tank 20, a foam inlet pipe 40, a water pump 61, a foam proportion mixer 60 and a liquid outlet pipe 50;

[0034] The water tank 10, the water inlet pipe 30, the water pump 61 and the liquid outlet pipe 50 are connected in sequence;

[0035] The foam tank 20, the foam inlet pipe 40 and the foam inlet port of the foam proportion mixer 60 are connected in sequence, and the outlet of the foam proportion mixer 60 is connected to the water inlet pipe 30;

[0036] The water return pipe 70 is connected between the liquid outlet pipe 50 and the water inlet of the foam proportioning mixer 60;

[0037] Among them, the liquid outlet pipe 50 is provided with a pressure sensor 51, and the foam inlet pipe 40 is provided with a metering valve 41; the pressure sensor 51 is located at the outlet of the water pump 61, specifically, the pressure sensor 51 can be located between the outlet of the water pump 61 and the return pipe 70, and the opening of the metering valve 41 can be adjusted according to the detection result of the pressure sensor 51.

[0038] As mentioned above, since the outlet water pressure of the water pump 61 corresponds to the corresponding flow rate under the rated working condition, the required water volume can be determined according to the detection result of the pressure sensor 51, and the valve opening of the metering valve 41 is adjusted according to the set foam ratio, so as to control the foam flow rate, so that the accurate foam mixing ratio can be ensured without setting a flow meter, saving costs. It should be noted that the set foam mixing ratio is obtained through test data in the early stage, and is the foam mixing ratio required in actual use, for example, the foam mixing ratio setting value is 2%, 3% or 6%, etc.

[0039] Under the rated working condition of the water pump 61, the rated outlet pressure of the water pump 61 corresponds to a rated flow rate of the water pump 61. If the outlet flow rate of the water pump 61 is changed while the rotation speed of the water pump 61 remains unchanged, the outlet pressure of the water pump 61 will change accordingly. For example, if the water pump 61 originally has four outlets for water discharge, but it is reduced to only two outlets for water discharge, the pressure of the water pump 61 will change, and the change in pressure and the change in flow rate are in a one-to-one correspondence. Therefore, the outlet flow rate of the water pump 61 can be determined by the water pressure detected by the pressure sensor 51.

[0040] The metering valve 41 is a valve device designed to accurately control and measure the flow of a fluid (such as a liquid or a gas). The core function of the metering valve 41 is to ensure that the flow of the fluid flowing through accurately matches the set value (the fluid flow value required by the user). The flow control is achieved by controlling the opening of the metering valve 41. It can be understood that for a valve, when the pressure is determined, the larger the opening, the greater the flow. Therefore, the opening size of the metering valve 41 determines the foam flow from the foam inlet pipe 40 into the foam proportioning mixer 60.

[0041] When the specific amounts of water and foam can be controlled, the ratio between the two is the ratio required for foam mixing. Therefore, the specific amount of water can be determined only after detecting the outlet pressure of the water pump 61. After the firefighter selects a foam mixing ratio (for example, 2%) for use, the required foam flow rate can be obtained through the foam mixing ratio and the outlet flow rate of the water pump 61 determined according to the detection result of the pressure sensor 51, and then the opening of the metering valve 41 can be adjusted accordingly according to the required amount of foam, so that the foam and water can be mixed according to the set ratio (for example, 2%).

[0042] Of course, it is understandable that a rear water inlet valve 31 is provided on the water inlet pipe 30, and the rear water inlet valve 31 is located on the upstream side of the connection position of the water inlet pipe 30 with the foam proportioning mixer 60, so that the conduction or cutoff of the water inlet pipe 30 can be controlled accordingly by opening or closing the rear water inlet valve 31, so as to control whether the water in the water tank 10 needs to be used according to the actual working conditions.

[0043] The water inlet pipe 30 is provided with a water suction valve 32, and the water suction valve 32 is located between the connection between the foam proportioning mixer 60 and the water inlet pipe 30 and the inlet of the water pump 61, and is therefore also located between the rear water inlet valve 31 and the inlet of the water pump 61. The water suction valve 32 is usually closed. When external water is needed, it is only necessary to connect the corresponding pipeline to the external water source and then open the water suction valve 32, so that the external water can be connected to the foam proportioning mixing system for use.

[0044] The water tank 10 is provided with an external water injection valve 11 , which is usually closed. When it is necessary to add water to the water tank 10 , it is only necessary to connect the pipeline and open the external water injection valve 11 to add water to the water tank 10 .

[0045] A foam inlet valve 42 is provided on the foam inlet pipe 40, and the foam inlet valve 42 is located on the upstream side of the metering valve 41. The foam inlet valve 42 is mainly used to control the foam to flow from the foam tank 20 into the foam proportioning mixer 60, that is, when it is opened, the foam can flow to the foam proportioning mixer 60, and when it is closed, the foam cannot flow to the foam proportioning mixer 60.

[0046] The return pipe 70 is provided with a foam ejection valve 74. When the foam ejection valve 74, the foam inlet valve 42, the rear water inlet valve 31 and / or the water suction port valve 32 are opened, as the water pump 61 runs, when the water flows through the narrow part (Venturi tube) of the foam ejection valve 74 at a certain pressure, the speed increases, causing the pressure in the area to decrease. This pressure drop forms a low-pressure area. The negative pressure generated in the low-pressure area can automatically introduce water into the foam proportioning mixer 60 to mix with the foam in a set proportion.

[0047] In more detail, the return pipe 70 includes a connected main pipe 71 and two branch pipes. The main pipe 71 is connected to the liquid outlet pipe 50. The two branch pipes are divided into a first branch pipe 72 and a second branch pipe 73. The first branch pipe 72 is connected to the water inlet of the foam proportioning mixer 60, and the second branch pipe 73 is connected to the water tank 10. The first branch pipe 72 is provided with a foam injection valve 74, and the second branch pipe 73 is provided with an internal water injection valve 75. When the internal water injection valve 75 is opened, water will flow into the water tank 10, thereby realizing the function of internal water recovery.

[0048] The pressure sensor 51 is located between the water inlet end of the main pipe 71 and the outlet of the water pump 61 , that is, the pressure sensor 51 is located between the return pipe 70 and the outlet of the water pump 61 .

[0049] In addition, a flushing pipe 80 and a flushing valve 81 arranged on the flushing pipe 80 are connected between the liquid outlet pipe 50 and the foam inlet pipe 40. After the fire extinguishing operation is completed, the foam liquid inlet valve 42 is closed and the foam flushing valve 81 is opened to flush the pipeline with clean water to remove residual foam liquid, prevent blockage, and keep the system unobstructed.

[0050] Among them, the connection between the flushing pipe 80 and the liquid outlet pipe 50 is located on the downstream side of the connection between the return pipe 70 and the liquid outlet pipe 50; the connection between the flushing pipe 80 and the foam inlet pipe 40 is located on the upstream side of the metering valve 41, so that the metering valve 41 and the devices on its downstream side can be cleaned.

[0051] Of course, in order to facilitate the replenishment of the foam in the foam tank 20, the foam tank 20 is connected to a foam external injection valve 43. Specifically, the foam external injection valve 43 is arranged on the foam inlet pipe 40 at the upstream side of the connection between the foam inlet pipe 40 and the flushing pipe 80. In this way, when the foam external injection valve 43 and the foam liquid inlet valve 42 are opened and the other valves are closed, the foam concentrate can be injected into the foam tank 20.

[0052] The liquid outlet pipe 50 is connected to both the water outlet valve 55 and the cannon liquid outlet valve 54. Specifically, the liquid outlet pipe 50 is connected to the cannon liquid outlet pipe 52 and the water outlet pipe 53. The cannon liquid outlet pipe 52 is connected to the fire cannon 90 and is provided with a cannon liquid outlet valve 54. The cannon liquid outlet valve 54 is used to control the start and stop of the fire cannon 90 spraying foam, and can quickly open or close the liquid circulation to respond to the immediate needs of the fire extinguishing operation and improve efficiency and safety. The water outlet pipe 53 directly leads to the outside world, and is provided with a water outlet valve 55. The water outlet valve 55 mainly controls the opening or closing of the function of directly discharging the liquid in the liquid outlet pipe 50 to the outside world, and also facilitates the discharge of the liquid containing foam after the flushing pipe 80.

[0053] Of course, it is understandable that the pressure sensor 51, the water pump 61 and the opening adjustment of each valve are realized by a controller, and the controller can be integrated into a unit module of the vehicle controller of the fire truck. The driver can set different foam mixing ratio gears (such as 2%, 3%, etc.) by operating the buttons on the console. When a certain gear is set, the water pump 61 controls the pump outlet pressure by adjusting the engine speed and its own speed, and synchronously adjusts the metering valve 41, thereby controlling the entire foam ratio mixing system and adjusting the flow rate of the foam liquid sprayed from the fire monitor 90.

[0054] The so-called "upstream side" and "downstream side" are divided according to the flow path of the fluid, the upstream side refers to the side of a certain element on the flow path that is closer to the source (foam tank 20 or water tank 10) than another element, and the downstream side refers to the side of a certain element on the flow path that is farther away from the source (foam tank 20 or water tank 10) than another element.

[0055] In addition, an embodiment of the present application also discloses a fire truck, which includes the foam mixing ratio system of the above embodiment and thus also has corresponding structure and beneficial effects, which will not be described in detail here.

[0056] In summary, the embodiments of the present application disclose a foam proportion mixing system and a fire truck. Through the property that the outlet water pressure of the water pump 61 corresponds to the corresponding flow rate under rated working conditions, the required water volume can be determined according to the detection result of the pressure sensor 51, and the valve opening of the metering valve 41 is adjusted according to the set foam ratio, thereby controlling the flow rate of the foam. In this way, there is no need to set up a flow meter to ensure an accurate foam mixing ratio, thereby saving costs.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A foam proportioning system, characterized in that: It comprises a water tank (10), a water inlet pipe (30), a foam tank (20), a foam inlet pipe (40), a water pump (61), a foam proportioning mixer (60) and a liquid outlet pipe (50); The water tank (10), the water inlet pipe (30), the water pump (61) and the liquid outlet pipe (50) are connected in sequence; The foam tank (20), the foam inlet pipe (40) and the foam inlet port of the foam proportion mixer (60) are connected in sequence, and the outlet of the foam proportion mixer (60) is connected to the water inlet pipe (30); The liquid outlet pipe (50) is provided with a pressure sensor (51), and the foam inlet pipe (40) is provided with a metering valve (41); the pressure sensor (51) is located at the outlet of the water pump (61), and the opening of the metering valve (41) can be adjusted according to the detection result of the pressure sensor (51).

2. The foam proportioning system according to claim 1, characterized in that: The water inlet pipe (30) is provided with a rear water inlet valve (31), and the rear water inlet valve (31) is located on the upstream side of the position where the water inlet pipe (30) is connected to the foam proportioning mixer (60); and / or, The water tank (10) is provided with an external water injection valve (11), the foam tank (20) is connected to a foam external injection valve (43), and the liquid outlet pipe (50) is connected to both the water outlet valve (55) and the gun liquid outlet valve (54).

3. The foam proportioning system according to claim 1, characterized in that: The water inlet pipe (30) is provided with a water suction port valve (32), and the water suction port valve (32) is located between the connection point between the foam proportioning mixer (60) and the water inlet pipe (30) and the inlet of the water pump (61).

4. The foam proportioning system according to claim 1, characterized in that: The foam inlet pipe (40) is provided with a foam inlet valve (42), and the foam inlet valve (42) is located on the upstream side of the metering valve (41).

5. The foam proportioning system according to claim 1, characterized in that: It also comprises a water return pipe (70), wherein the water return pipe (70) is connected between the liquid outlet pipe (50) and the water inlet of the foam proportioning mixer (60).

6. The foam proportioning system according to claim 5, characterized in that: The water return pipe (70) is provided with a foam injection valve (74).

7. The foam proportioning system according to claim 6, characterized in that: The return pipe (70) comprises a connected main pipe (71) and two branch pipes. The main pipe (71) is connected to the liquid outlet pipe (50). The two branch pipes are divided into a first branch pipe (72) and a second branch pipe (73). The first branch pipe (72) is connected to the water inlet of the foam proportioning mixer (60), and the second branch pipe (73) is connected to the water tank (10). The first branch pipe (72) is provided with the foam injection valve (74), and the second branch pipe (73) is provided with an internal water injection valve (75).

8. The foam proportioning system according to claim 1, characterized in that: A flushing pipe (80) and a flushing valve (81) arranged on the flushing pipe (80) are connected between the liquid outlet pipe (50) and the foam inlet pipe (40).

9. The foam proportioning system according to claim 8, characterized in that: The connection point between the flushing pipe (80) and the foam inlet pipe (40) is located on the upstream side of the metering valve (41).

10. A fire truck, characterized in that: The foam proportioning system comprises the foam proportioning system according to any one of claims 1 to 9.

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