Pneumatic small-flow foam proportional mixing and foaming system

Abstract

The invention belongs to the technical field of fire emergency, and discloses a pneumatic small-flow foam proportional mixing and foaming system. The pneumatic small-flow foam proportional mixing and foaming system comprises a compressed air driving unit, a fire fighting water pumping unit, a foam liquid pumping unit, a foam mixed liquid storage unit, a foam liquid pumping unit, a gas-liquid mixing unit and a system control unit. The pneumatic small-flow foam proportional mixing foaming system has good foaming performance and can be used in foam fire-fighting emergency. The foam generating system has a controllable rate function, is smaller in size compared with a traditional foam generating system and is suitable for a small space.

Description

Technical Field

[0001] The invention relates to the technical field of fire emergency response, in particular to a pneumatic small-flow foam proportion mixing foaming system. Background Art

[0002] There are various types of foam mixers used in foam fire extinguishing systems on the market. According to their different structures and working principles, they mainly include pipeline type, ring pump type, pressure type, balanced pressure type and metered injection type. The pipeline type has a very simple structure, is easy to install and use, and has a low cost, but has the disadvantages of large pressure loss and low adjustment accuracy; the ring pump system has a low cost and less daily maintenance work, but the foam mixing ratio is easily affected by the pump inlet and outlet pressure difference and the liquid level difference, which can easily form backflow and affect the foaming effect; the pressure type has a high degree of integration and a very stable foam mixing ratio, but the system debugging and maintenance are inconvenient, the sustainability is poor, and the specifications are relatively simple; the balanced pressure type has high mixing accuracy and a large applicable flow range, and can realize online replenishment of foam concentrate, but the cost is high, and the debugging work requires high professionalism and is relatively restrictive; the metered injection system is stable and reliable, can be debugged online, and has a wide applicability, but the operation and maintenance cost is high, the online control system is relatively complex, and the front-end power supply reliability requirements are high.

[0003] The above-mentioned foam proportioning mixers can all be used to mix foam liquid and water in proportion, but cannot directly form foam, and need to be formed through a foam generator. Combining the advantages and disadvantages of existing foam proportioning mixers, the present invention proposes a pneumatic small-flow foam proportioning and foaming system. Summary of the invention

[0004] The purpose of the present invention is to provide a pneumatic small-flow foam proportion mixing and bubbling system, which solves the problems mentioned in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pneumatic small flow foam proportion mixing foaming system, including a compressed air driving unit, a fire water pumping unit, a foam liquid pumping unit, a foam mixed liquid storage unit, a foam liquid pumping unit, a gas-liquid mixing unit and a system control unit;

[0006] The compressed air driving unit is driven by compressed air to provide power for the fire water plunger pump and the foam liquid plunger pump, and to transport air and foam mixed liquid to form bubbles;

[0007] The fire water pumping unit is driven by a compressed air driver to pump out fire water in proportion from the fire water tank;

[0008] The foam liquid pumping unit is driven by a compressed air driver to pump out the foam liquid from the foam liquid tank in proportion;

[0009] The foam mixed liquid storage unit fully mixes the pumped fire water with the foam liquid and stores the mixture;

[0010] The foam liquid pumping unit pumps out the foam mixed liquid from the foam mixed liquid storage unit through electric drive;

[0011] The gas-liquid mixing unit is used to mix the foam liquid with compressed air to form foam;

[0012] The system control unit is used to control the driving speed of the compressed air driving unit and the compressed air delivery speed, control the speed at which the foam liquid pumping unit pumps out the foam mixed liquid, and ensure that the speed at which the fire water pumping unit pumps out fire water, the speed at which the foam liquid pumping unit pumps out foam liquid, and the speed at which the foam liquid pumping unit pumps out the foam mixed liquid reach a balanced state.

[0013] Preferably, the gas-liquid mixing unit includes a mixing pipe, the inner wall of the mixing pipe is provided with a foam mixed liquid network, an annular groove is opened on the inner wall of the mixing pipe and on the right side of the foam mixed liquid network as a gas-liquid mixing chamber, a compressed air chamber is also opened on the mixing pipe and on the outside of the annular groove, a compressed air inlet is opened on the outer wall of the mixing pipe and is connected to the compressed air chamber, and evenly distributed air outlet holes are opened in the annular groove at positions corresponding to the compressed air chambers for compressed air discharge.

[0014] Preferably, the inner diameter of one end of the annular groove close to the foam mixed liquid passing network is larger than the inner diameter of the other end thereof, and the groove surface of the annular groove has a smooth transition.

[0015] Preferably, the gas-liquid mixing unit further comprises an annular limiting groove, a limiting ring, a telescopic motor, a movable pipe, a second air outlet hole, a sealing plate, a mixing shell, a pressure relief plate, a spring, a discharge pipe, a movable rod, a sealing block, and a liquid hole. The annular limiting groove is arranged on the inner wall of the annular groove. The limiting ring is in the annular limiting groove and is connected to the left and right walls of the annular limiting groove through the telescopic motor, so that the limiting ring can reciprocate along its axial direction. The outer wall of the movable pipe is fixedly connected to the inner wall of the limiting ring. The second air outlet hole is arranged at a position corresponding to the first air outlet hole on the movable pipe. The sealing plate is fixedly connected to the left opening of the movable pipe. A plurality of mixing shells are fixedly connected to the movable pipe. The inner wall is fixedly connected to the mixing shell, and the mixing shell is also fixedly connected to the sealing plate. A pressure relief plate is inserted in a hole opened on the inner side of the mixing shell near the sealing plate position, and the pressure relief plate and the mixing shell are also movably connected by a spring piece, so that the pressure relief plate can be partially separated from the hole where it is located under the pressure in the mixing shell. The outer side of the discharge pipe is fixedly connected to the inner wall of the annular groove and is on the right side of the annular limit groove. The discharge pipe is funnel-shaped, and a number of movable rods are fixedly connected to the inner wall of the discharge pipe, and each movable rod passes through the corresponding mixing shell and reaches the inside thereof. A sealing block is fixedly connected to one end of the movable rod away from the discharge pipe, and a liquid hole is opened at a position corresponding to the sealing block on the sealing plate, and the sealing block is inserted in the liquid hole.

[0016] Preferably, the gas-liquid mixing unit also includes a dispersion column and a central guide rod, wherein the central guide rod is fixedly connected to the center of the sealing plate away from the foam mixed liquid through-net, the central guide rod is conical in shape and the tip points in the direction of the discharge pipe, and a plurality of the dispersion columns are fixedly connected to the sealing plate and are located outside the central guide rod.

[0017] Preferably, the mixing shells are arranged in a ring shape with the axis of the movable tube as a reference.

[0018] Preferably, the thickness of the sealing plate is the same as the thickness of the sealing block and is smaller than the telescopic amount of the telescopic motor.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are:

[0020] 1. The pneumatic small flow foam proportion mixing foaming system has good foaming performance and can be used in foam fire emergency. The invention has a controllable rate function and is smaller in size than the traditional foam generating system, and is suitable for small spaces.

[0021] 2. The pneumatic small-flow foam proportion mixing system uses compressed air to efficiently drive the foam liquid and fire water to pre-mix to form a preliminary foam liquid mixture, and further mixes the mixture with air through a gas-liquid mixing unit to generate stable and efficient foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The working principle diagram of the system of the present invention is

[0023] Figure 2 A top view of the gas-liquid mixing unit of the present invention;

[0024] Figure 3 For the present invention Figure 2 Middle AA section;

[0025] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the pressure relief plate of the present invention;

[0027] Figure 6 The figure is a flowchart of the system workflow of the present invention.

[0028] In the figure: 1. compressed air drive unit; 2. system control unit; 3. foam liquid pumping unit; 4. fire water pumping unit; 5. foam mixture storage unit; 6. foam liquid pumping unit; 7. gas-liquid mixing unit; 71. mixing pipeline; 72. foam mixture network; 73. annular groove; 74. compressed air cavity; 75. compressed air inlet; 76. outlet hole 1; 8. annular limit groove; 9. limit ring; 10. telescopic motor; 11. movable pipe; 12. outlet hole 2; 13. sealing plate; 14. mixing shell; 15. pressure relief plate; 16. discharge pipe; 17. movable rod; 18. sealing block; 19. liquid hole; 20. dispersion column; 21. center guide rod; 22. spring. DETAILED DESCRIPTION

[0029] See also Figure 1-6 The present invention provides a technical solution: a pneumatic small flow foam proportion mixing and foaming system, which is used for pneumatic small flow foam proportion mixing and foaming.

[0030] Embodiment 1 comprises the following steps:

[0031] S1: Before using this system, turn on the compressed air storage bottle switch first, and the compressed air storage bottle should be connected to the compressed air drive unit 1 through a high-pressure hose.

[0032] Furthermore, the compressed air storage bottle does not belong to the equipment of the present invention, but is an external device.

[0033] S2: Use the system control unit 2 to set the required foam flow rate and start the pneumatic small-flow foam proportion mixing system.

[0034] Furthermore, the system control unit 2 should include a PLC controller and a touch display screen.

[0035] Furthermore, the PLC controller can control the start and stop of the compressed air driving unit 1 and the foam liquid pumping unit 2 and the valve opening, and receive a liquid level feedback signal from the foam mixed liquid storage unit 5 .

[0036] Furthermore, the touch screen should display the foam output rate and the foam mixed liquid reserve.

[0037] S3: The system control unit 2 starts the compressed air driving unit 1 to premix the foam mixture.

[0038] Furthermore, the compressed air drive unit 1 is externally connected to a high-pressure gas cylinder through a high-pressure hose, and is internally connected to a gas-liquid mixing unit 7; the foam liquid pumping unit 3 and the fire water pumping unit 4 are connected through a stainless steel pipe; the foam liquid pumping unit 3 and the fire water pumping unit 4 are respectively connected to the foam mixed liquid storage unit 5 through a stainless steel pipe and a three-way joint.

[0039] Furthermore, in the foam mixture premixing stage, all valves in the compressed air drive unit 1 are fully opened and the drive speed reaches the maximum value.

[0040] Furthermore, the kinetic energy of the compressed air drive unit 1 comes from the pressure difference provided by the compressed air.

[0041] Furthermore, the foam mixture is a mixture of foam liquid and fire water in a ratio of 3:97, and the ratio of the foam liquid flow delivered by the foam liquid pumping unit 3 to the fire water flow delivered by the fire water pumping unit 4 is 3:97.

[0042] Furthermore, the foam mixed liquid is stored in the foam mixed liquid storage unit 5 .

[0043] S4: After the foam mixture in the foam mixture storage unit 5 reaches the preset value, the system control unit 2 adjusts each valve in the compressed air drive unit 1 to the corresponding foam output rate setting value, and starts the foam mixture pumping unit 6, and the operating power is the corresponding foam output rate power.

[0044] S5: The foam mixed liquid pumping unit 6 pumps the foam mixed liquid from the foam mixed liquid storage unit 5 to the gas-liquid mixing unit 7, and fully mixes it with the air delivered by the compressed air driving unit 1 to form foam.

[0045] Furthermore, the gas-liquid mixing unit 7 has a mesh structure inside (the structure of the gas-liquid mixing unit 7 is shown in FIG. Figure 2-5 shown).

[0046] The gas-liquid mixing unit 7 includes a mixing pipe 71, the inner wall of which is provided with a foam mixed liquid network 72, an annular groove 73 is provided on the inner wall of the mixing pipe 71 and on the right side of the foam mixed liquid network 72 as a gas-liquid mixing chamber, a compressed air chamber 74 is also provided on the mixing pipe 71 and on the outside of the annular groove 73, a compressed air inlet 75 is provided on the outer wall of the mixing pipe 71 and is connected to the compressed air chamber 74, and evenly distributed air outlet holes 76 are provided in the annular groove 73 at the position corresponding to the compressed air chamber 74 for compressed air discharge.

[0047] The foam mixture and the compressed gas are fully mixed in the gas-liquid mixing chamber to form bubbles.

[0048] Furthermore, the foam mixture inlet of the gas-liquid mixing unit 7 is fixedly connected to the foam mixture pumping unit 6 through a stainless steel pipe, the compressed air inlet is connected to the air outlet of the compressed air driving unit 1 through a hose, and the foam outlet is connected to an external spraying device.

[0049] S6: The low-multiplicity foam formed after passing through the gas-liquid mixing unit 7 is sprayed through external equipment to carry out fire emergency activities.

[0050] Furthermore, the above-mentioned external device does not belong to the present invention, and the external device may be a foam gun, a foam cannon, etc.

[0051] Embodiment 2: This embodiment differs from Embodiment 1 in that the inner diameter of one end of the annular groove 73 close to the foam mixture liquid through-net 72 is larger than the inner diameter of the other end thereof, and the groove surface of the annular groove 73 has a smooth transition.

[0052] Based on this embodiment, the inwardly expanded annular groove design allows the mixing pipe 71 to have sufficient mixing space, which helps to speed up the foam discharge speed.

[0053] Embodiment 3: This embodiment is different from Embodiment 1 in that the gas-liquid mixing unit 7 further comprises an annular limiting groove 8, a limiting ring 9, a telescopic motor 10, a movable tube 11, an air outlet hole 12, a sealing plate 13, a mixing shell 14, a pressure relief plate 15, a spring 22, a discharge pipe 16, a movable rod 17, a sealing block 18 and a liquid hole 19; the annular limiting groove 8 is arranged on the inner wall of the annular groove 73; the limiting ring 9 is in the annular limiting groove 8 and is connected to the left and right walls of the annular limiting groove 8 through the telescopic motor 10, so that the limiting ring 9 can reciprocate along its axial direction; the outer wall of the movable tube 11 is fixedly connected to the inner wall of the limiting ring 9; an air outlet hole 12 is arranged at a position corresponding to the air outlet hole 1 76 on the movable tube 11; a sealing plate 13 is fixedly connected to the left opening of the movable tube 11; a plurality of mixing shells 14 are fixedly connected to the inner wall of the movable tube 11; and the mixing shell 14 is fixedly connected to the inner wall of the movable tube 11. The mixing shell 14 is also fixedly connected to the sealing plate 13, and each mixing shell 14 is arranged in a ring with the axis of the movable tube 11 as a reference. A pressure relief plate 15 is inserted into the hole opened on the inner side of the mixing shell 14 near the sealing plate 13, and the pressure relief plate 15 and the mixing shell 14 are also movably connected through a spring piece 22, so that the pressure relief plate 15 can be partially separated from the hole where it is located by the pressure in the mixing shell 14. The outer side of the discharge pipe 16 is fixedly connected to the inner wall of the annular groove 73 and is on the right side of the annular limit groove 8. The discharge pipe 16 is funnel-shaped, and a plurality of movable rods 17 are fixedly connected to the inner wall of the discharge pipe 16. Each movable rod 17 passes through the corresponding mixing shell 14 and reaches the inside thereof. A sealing block 18 is fixedly connected to one end of the movable rod 17 away from the discharge pipe 16, and a liquid hole 19 is opened at a position corresponding to the sealing block 18 on the sealing plate 13, and the sealing block 18 is inserted into the liquid hole 19.

[0054] The thickness of the sealing plate 13 is the same as that of the sealing block 18 and is smaller than the telescopic amount of the telescopic motor 10. When the telescopic motor 10 drives the movable tube 11 to move through the limit ring 9, the sealing block 18 can move at the liquid hole 19 to form a switch structure. When the sealing block 18 is separated from the liquid hole, the foam liquid can enter the mixing shell 14.

[0055] The gas-liquid mixing unit 7 also includes a dispersion column 20 and a central guide rod 21. The central guide rod 21 is fixedly connected to the center of the sealing plate 13 far away from the foam mixed liquid network 72. The central guide rod 21 is conical in shape and the tip points in the direction of the discharge pipe. Several dispersion columns 20 are fixedly connected to the sealing plate 13 and are located outside the central guide rod 21. The design of the dispersion column 20 helps to improve the efficiency of foam formation. The central guide rod 21 is used for the foam direction and can also be designed into a spiral columnar structure, which can allow the foam to quickly rush to the discharge pipe 16 accompanied by compressed gas.

[0056] When the gas-liquid mixing unit 7 is working, the foam mixed liquid enters through the left side of the mixing pipe 71, enters the annular groove 73 through the foam mixed liquid net 72, and the movable tube 11 is driven by the telescopic motor 10 through the limit ring 9 to perform telescopic movement. When the movable tube 11 moves toward the foam mixed liquid net 72, the air outlet hole 1 76 and the air outlet hole 2 12 are staggered, and the air outlet hole 1 76 is blocked by the movable tube 11. At the same time, the sealing block 18 is separated from the liquid hole 19, and the foam mixed liquid enters the mixing shell 14 through the liquid hole 19. When the movable tube 11 retracts, the sealing block 18 blocks the liquid hole 19, and the air outlet hole 1 76 and the air outlet hole 2 12 are opposite to each other. The compressed gas enters the mixing shell 14 and contacts the foam mixed liquid and rushes open the pressure relief plate 15. The rushed foam collides with the dispersion column 20 and is dispersed, and is discharged from the discharge pipe 16 accompanied by a high-speed airflow guided by the central guide rod 21.

[0057] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic small flow foam proportion mixing foaming system, characterized by: It includes a compressed air driving unit, a fire water pumping unit, a foam liquid pumping unit, a foam mixed liquid storage unit, a foam liquid pumping unit, a gas-liquid mixing unit and a system control unit; The compressed air driving unit is driven by compressed air to provide power for the fire water plunger pump and the foam liquid plunger pump, and to transport air and foam mixed liquid to form bubbles; The fire water pumping unit is driven by a compressed air driver to pump out fire water in proportion from the fire water tank; The foam liquid pumping unit is driven by a compressed air driver to pump out the foam liquid from the foam liquid tank in proportion; The foam mixed liquid storage unit fully mixes the pumped fire water with the foam liquid and stores the mixture; The foam liquid pumping unit pumps out the foam mixed liquid from the foam mixed liquid storage unit through electric drive; The gas-liquid mixing unit is used to mix the foam liquid with compressed air to form foam; The system control unit is used to control the driving speed of the compressed air driving unit and the compressed air delivery speed, control the speed at which the foam liquid pumping unit pumps out the foam mixed liquid, and ensure that the speed at which the fire water pumping unit pumps out fire water, the speed at which the foam liquid pumping unit pumps out foam liquid, and the speed at which the foam liquid pumping unit pumps out the foam mixed liquid reach a balanced state.

2. A pneumatic small flow foam proportion mixing system according to claim 1, characterized in that: The gas-liquid mixing unit includes a mixing pipe, the inner wall of the mixing pipe is provided with a foam mixed liquid network, the inner wall of the mixing pipe and on the right side of the foam mixed liquid network is provided with an annular groove as a gas-liquid mixing chamber, a compressed air chamber is also provided on the mixing pipe and on the outside of the annular groove, a compressed air inlet is provided on the outer wall of the mixing pipe and is connected to the compressed air chamber, and evenly distributed air outlet holes are provided in the annular groove at positions corresponding to the compressed air chambers for compressed air discharge.

3. A pneumatic small flow foam proportion mixing system according to claim 2, characterized in that: The inner diameter of one end of the annular groove close to the foam mixed liquid passing net is larger than the inner diameter of the other end thereof, and the groove surface of the annular groove has a smooth transition.

4. A pneumatic small flow foam proportion mixing system according to claim 2, characterized in that: The gas-liquid mixing unit also includes an annular limiting groove, a limiting ring, a telescopic motor, a movable pipe, a second air outlet, a sealing plate, a mixing shell, a pressure relief plate, a spring, a discharge pipe, a movable rod, a sealing block, and a liquid hole. The annular limiting groove is arranged on the inner wall of the annular groove. The limiting ring is in the annular limiting groove and is connected to the left and right walls of the annular limiting groove through the telescopic motor, so that the limiting ring can reciprocate along its axial direction. The outer wall of the movable pipe is fixedly connected to the inner wall of the limiting ring. The movable pipe is provided with a second air outlet at a position corresponding to the first air outlet. The left opening of the movable pipe is fixedly connected to a sealing plate. A plurality of mixing shells are fixedly connected to the inner wall of the movable pipe. The mixing shell is also fixedly connected to the sealing plate, a pressure relief plate is inserted in a hole opened on the inner side of the mixing shell near the sealing plate, and the pressure relief plate and the mixing shell are also movably connected by a spring piece, so that the pressure relief plate can be partially separated from the hole where it is located under the pressure in the mixing shell, the outer side of the discharge pipe is fixedly connected to the inner wall of the annular groove and is on the right side of the annular limit groove, the discharge pipe is funnel-shaped, and a plurality of movable rods are fixedly connected to the inner wall of the discharge pipe, each movable rod passes through the corresponding mixing shell and reaches the inside thereof, and a sealing block is fixedly connected to one end of the movable rod away from the discharge pipe, a liquid hole is opened at a position corresponding to the sealing block on the sealing plate, and the sealing block is inserted in the liquid hole.

5. A pneumatic small flow foam proportion mixing system according to claim 4, characterized in that: The gas-liquid mixing unit also includes a dispersion column and a central guide rod. The central guide rod is fixedly connected to the center of the side of the sealing plate away from the foam mixed liquid network. The central guide rod is conical in shape and the tip points to the direction of the discharge pipe. Several dispersion columns are fixedly connected to the sealing plate and are located outside the central guide rod.

6. A pneumatic small flow foam proportion mixing system according to claim 5, characterized in that: The mixing shells are arranged in a ring shape with the axis of the movable tube as a reference.

7. A pneumatic small flow foam proportion mixing system according to claim 6, characterized in that: The thickness of the sealing plate is the same as that of the sealing block and is smaller than the telescopic amount of the telescopic motor.

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