Foam and water spray duplex fire extinguishing system with energy recovery and dry grinding prevention

Abstract

The utility model relates to a foam and water spray duplex fire extinguishing system with energy recovery and dry grinding prevention functions. The foam and water spray duplex fire extinguishing system comprises a proportional mixing device, a foam liquid cabinet and a control device, the proportional mixing device comprises a hydraulic unit, a foam liquid pump, a fire-fighting water header pipe, a mixed liquid header pipe and an electric three-way ball valve; the water outlet end of the foam liquid cabinet is connected with the electric three-way ball valve; and the control device is respectively connected with the foam liquid cabinet and the proportional mixing device. According to the hydraulic unit and the foam liquid pump, accurate proportion mixing of foam liquid and water can be achieved according to design calculation and matching type selection, a liquid outlet of the foam liquid pump is connected to the front end of the hydraulic unit, energy recovery and full mixing of the foam liquid are achieved, and a liquid inlet of the foam liquid pump is connected with the hydraulic unit through the electric three-way ball valve. Automatic switching of foam liquid and water can be achieved, and dry grinding and damage of the foam-free submerged pump are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fire extinguishing systems, in particular to a foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding functions. Background Art

[0002] Since the beginning of the 21st century, society has experienced rapid development, leading to an increasing demand for energy. Firefighting systems provide comprehensive fire safety assurance for these energy-related infrastructure. Oil-based firefighting, in particular, such as oil-immersed power transformers, converter station phase regulators, and their associated lubricating oil systems, are typically protected by firefighting systems such as water spray and foam spray. However, while water spray offers a better cooling effect, it is less effective at extinguishing oil fires and consumes a lot of water. Foam spray, on the other hand, is more effective at extinguishing oil fires, but less effective at cooling them. Furthermore, foam spray systems typically utilize premixed foam liquid, which limits both the extinguishing time and the shelf life of the premixed foam liquid. Therefore, a firefighting system combining the capabilities of a ready-mix foam spray and a water spray is needed to protect these oil-based energy facilities, achieving both efficient fire extinguishing and sufficient cooling.

[0003] The optimal foam fire extinguishing system is to store the foam liquid separately and then mix it with water in appropriate proportions during firefighting. This maximizes the storage capacity and extinguishing time of the foam liquid, extending its storage life, reducing operating costs, and reducing maintenance workload. As a key component of a foam fire extinguishing system, the foam proportioning device determines its performance.

[0004] Currently, commonly used mixing devices include pressure-type and balanced-type mixing devices. A pressure-type mixing device consists of a diaphragm-type foam tank and a mixing device. During operation, a portion of the firefighting water enters the tank, squeezes out the foam liquid, and then enters the mixing device, where it mixes with the main stream of firefighting water. The diaphragm in the foam tank of this device is made of rubber, which is susceptible to aging and damage from long-term immersion in the foam liquid, potentially causing failure during firefighting. Furthermore, the device is complex to maintain. A balanced-type mixing device consists of a foam pump, a drive unit, a mixing device, a balancing valve, and a control cabinet. The foam pump is typically driven by a motor, a water-discharge turbine, or a diesel generator set, and its start and stop are controlled by a dedicated power control cabinet. The mixing ratio of the foam liquid entering the mixing device is adjusted by a balancing valve. This device requires external power to drive the foam pump, or sacrifices a large amount of pressurized water to drive the turbine. This consumes a large amount of pressurized water, and the mixing ratio depends on a dedicated balancing valve, resulting in a complex structure and low reliability.

[0005] Therefore, a high-performance, high-reliability, low external energy dependence, simple structure, and precise mixing ratio proportional mixing device is needed for application in foam fire extinguishing systems, which can also form a foam-water spray dual fire extinguishing system. Utility Model Content

[0006] In response to the shortcomings of the existing technology, the present invention provides a dual foam and water spray fire extinguishing system with energy recovery and dry wear prevention. This dual fire extinguishing system does not require external power and uses fire water to drive the hydraulic unit, which drives the foam liquid pump unit to operate, outputting high-pressure foam liquid, which enters the main pipeline and mixes with the fire water. The mixed liquid flowing through the hydraulic unit continues to drive the foam liquid pump unit, and the hydraulic unit continuously provides the system with foam mixed liquid. When the foam liquid is used up, the system automatically controls the electric three-way ball valve at the front end of the foam pump to switch from the foam liquid passage to the water passage, allowing the fire water to enter the foam liquid pump unit to operate, thereby preventing the pump unit's flow components from dry wear and damage due to lack of foam liquid. The high-pressure foam liquid or water output by the foam liquid pump enters the front end or upstream of the hydraulic unit and continues to drive the hydraulic unit, realizing the recovery of driving energy. At the same time, the foam liquid can also be fully mixed with the fire water in the hydraulic unit to ensure the fire extinguishing effect.

[0007] The utility model has a proportional mixing device for energy recovery and anti-dry grinding, and is mainly composed of a hydraulic unit, a foam liquid pump, an electric three-way ball valve, a filter, inlet and outlet pressure sensors, a liquid flow sensor, a check valve, inlet and outlet flanges, pipelines and connecting cables.

[0008] The foam liquid cabinet of the utility model is composed of a body, a liquid outlet pipe and a control valve, a liquid adding valve, a sewage valve, an overflow pipe, a liquid level display and a sensor device, a liquid outlet filter, pipelines and cables.

[0009] In order to realize the automatic control and switching of the electric three-way ball valve, a control device needs to be set in the fire extinguishing system control cabinet to integrate the control elements and logic circuits used to control the electric three-way ball valve.

[0010] The electric three-way ball valve has three position states: when the system is on standby, the valve is at port a and position d; when foam fire is extinguished, the valve is in the connection between ports a and b; when water fire is extinguished or cleaned, ports c and b are connected.

[0011] Specifically, the present invention is achieved through the following technical solutions:

[0012] A foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding, including a proportioning mixing device, a foam liquid tank and a control device;

[0013] The proportioning mixing device includes a hydraulic unit, a foam liquid pump, a fire water main, a mixed liquid main and an electric three-way ball valve. The fire water main is connected to the water inlet of the hydraulic unit, the water outlet of the foam liquid pump is connected to the fire water main, the water inlet of the foam liquid pump is connected to the fire water main via an electric three-way ball valve, and the mixed liquid main is connected to the water outlet of the hydraulic unit.

[0014] The water outlet of the foam liquid tank is connected to an electric three-way ball valve;

[0015] The control device is connected to the foam liquid cabinet and the proportion mixing device respectively.

[0016] In order to monitor the water pressure on the main pipe in real time, a water inlet pressure sensor is provided on the fire water main pipe, and a mixed liquid end water flow sensor and a mixed liquid end pressure sensor are provided on the mixed liquid main pipe.

[0017] In order to prevent the foam liquid from flowing back, a foam liquid check valve is provided on the liquid outlet pipe connected to the fire water main at the water outlet end of the foam liquid pump.

[0018] In order to drive the foam liquid pump to work, the driving force is transmitted between the hydraulic unit and the foam liquid pump through a coupling.

[0019] In order to filter the fire water, a water supply filter is provided on the water supply branch pipe connecting the electric three-way ball valve and the fire water main.

[0020] In order to filter the foam liquid, a liquid supply filter is provided on the foam liquid pipe whose water outlet end of the foam liquid tank is connected to the electric three-way ball valve.

[0021] In order to replenish the liquid in time, a liquid level sensor is provided on the foam liquid cabinet.

[0022] The beneficial effects of the utility model are:

[0023] (1) Accurate mixing ratio, simple device structure, small space occupation and high reliability of the fire extinguishing system: Through the reasonable matching of the hydraulic unit and the foam liquid pump, the precise proportion of foam liquid mixing can be achieved, breaking the current technical state of the domestic foam fire extinguishing system that mainly stays at a large mixing ratio of 6%, 3%, etc., and a 1% mixing ratio can be adopted. In this way, the volume of the foam liquid storage device can be reduced to 1 / 3 or 1 / 6 of the existing volume, and no special proportion mixer and balancing valve are required, and no special power control cabinet is required for controlling the foam liquid pump drive device, making the space occupation of the whole fire extinguishing system smaller, which is particularly suitable for the installation of such fire extinguishing systems in some smaller places;

[0024] (2) The device has low dependence on external energy and no fire water loss: a non-discharge hydraulic unit is used to drive the foam liquid pump, and no additional electricity is required to drive the motor to drive the foam liquid pump, or the foam liquid pump is driven by an internal combustion engine, or the foam liquid pump is driven by a discharge-type turbine. This avoids dependence on external energy and multiple conversion losses, and there is no loss of fire water; the common motor-driven balanced proportional mixing device, the motor power of the foam liquid pump ranges from 15kW to tens of kW, and the energy dependence is high; the use of this device also brings a more compact structure to the entire proportional mixing device, without the need for additional inlet and outlet (drain) water pipes, oil pipes, lines, or even ventilation and smoke exhaust pipes, etc., making the fire equipment room cleaner and more convenient for daily management and maintenance;

[0025] (3) Energy recovery and full mixing of foam liquid: The foam liquid pressurized by the foam liquid pump flows back to the front end of the hydraulic unit, which can provide driving force to the hydraulic unit again, realizing both the precise injection of foam liquid and energy recovery; the foam liquid entering the hydraulic unit can also be fully stirred and mixed with the fire water;

[0026] (4) It can prevent the foam liquid pump from being damaged due to lack of liquid and dry grinding: through the automatic switching of the electric three-way ball valve, especially when the foam liquid is used up, the system automatically switches to the water supply state, thus avoiding the foam liquid pump from being damaged due to lack of liquid and dry grinding; in the state of the simple foam liquid fire extinguishing system, it also automatically cleans the foam liquid pump to avoid the corrosion of the foam liquid remaining in the pump, pipeline and valve parts after the system is used up; in the foam-water spray dual fire extinguishing system, it automatically switches from the foam fire extinguishing state to the water spray fire extinguishing state, and there is almost no loss of water volume and water pressure;

[0027] (5) The integrated device is easy to connect and can be flexibly composed of a foam fire extinguishing system or a foam-water spray combined fire extinguishing system to meet the fire protection needs of different places. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding capabilities according to the present invention;

[0029] Figure 2 This is a working principle diagram of the utility model;

[0030] Figure 3 The three position states of the electric three-way ball valve of the utility model are shown in FIG. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0032] like Figure 1 The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding shown in the figure includes a proportioning mixing device 1, a foam liquid cabinet 2 and a control device 3. The control device 3 is connected to the foam liquid cabinet 2 and the proportioning mixing device 1 respectively, and is used to control the operation of each component.

[0033] Specifically, the proportion mixing device 1 includes a hydraulic unit 101, a foam liquid pump 102, a fire water main 111, a mixed liquid main 112 and an electric three-way ball valve 103. The fire water main 111 is connected to the water inlet end A of the hydraulic unit 101, and the fire water main 111 is provided with a water inlet end pressure sensor 104. The water outlet end of the foam liquid pump 102 is connected to the fire water main 111 through a liquid outlet pipe 116, and the liquid outlet pipe 116 is provided with a foam liquid stop valve. The return valve 110, the water inlet end of the foam liquid pump 102 is connected to the electric three-way ball valve through the merging branch pipe 115, the driving force is transmitted between the hydraulic unit 101 and the foam liquid pump 102 through the coupling 109, the mixed liquid main pipe 112 is connected to the water outlet end B of the hydraulic unit 101, and the mixed liquid main pipe 112 is provided with a mixed liquid end water flow sensor 105 and a mixed liquid end pressure sensor 106. The water outlet end of the foam liquid tank 2 is connected to the foam liquid tank 2 through the liquid outlet pipe 203 and the foam liquid pipe 210. , the liquid supply branch 114 is connected to the electric three-way ball valve 103, the foam liquid pipe 210 is provided with a liquid supply filter 209 and a liquid outlet valve 204, the body 201 of the foam liquid tank 2 is provided with a liquid level sensor 202, the liquid level sensor 202 has a high liquid level 202a and a low liquid level 202b, an overflow pipe 205 is provided in the body 201, and a liquid filling valve 206, a drain valve 207, and an overflow drain pipe 208 are provided at the bottom of the body 201. The electric three-way ball valve 103 is provided. The water supply branch pipe 113 is connected to the fire water main 111, and a water supply filter 107 is provided on the water supply branch pipe 113. The electric three-way ball valve 103 has four interfaces a, b, c, and d, among which the interface d is connected to the control device 3 through the electric valve actuator 108. The control cabinet 31 of the control device 3 is connected to each sensor through the signal line 32. The control cabinet 31 is connected to the electric valve actuator 108 through the control line 33, and the control cabinet 31 is connected to the power supply through the power line 34.

[0034] In the present invention, the hydraulic unit 101 and the foam liquid pump 102 can also be an integrated device, and the driving force between the hydraulic unit 101 and the foam liquid pump 102 is transmitted through the internal transmission shaft without the need for an external coupling; water intake and liquid distribution are carried out through the internal flow channel and control valve, and the output of the foam mixture is realized;

[0035] The control cabinet 31 of the present invention can be a common control cabinet for the entire fire extinguishing system, or it can be a form in which the proportional mixing device control module and the fire extinguishing system control cabinet are independent of each other;

[0036] The electric three-way ball valve 103 of the present invention can be replaced by electrically controlled valves respectively provided on the water supply passage and the liquid supply passage. The electric three-way ball valve 103 can in turn be replaced by a pipeline tee, thereby realizing automatic switching of the liquid supply and water supply of the foam-water spray dual fire extinguishing system.

[0037] When the system is only a single foam fire extinguishing system, the water supply end valve can also be replaced by a manual valve; after the foam liquid is used up, the entire system stops; then the water supply end valve is manually opened, the foam liquid pump is started, and the foam liquid pump and pipelines, valves, etc. are cleaned.

[0038] The high-pressure foam liquid at the outlet of the foam liquid pump can also be connected to the water outlet B of the hydraulic unit. In this case, there is no energy recovery, and the foam liquid cannot be fully stirred and mixed. It can only meet the basic foam proportion mixing function requirements.

[0039] The hydraulic unit can be of vane type or impeller type, and the foam liquid pump can be of the form of a vane pump, a reciprocating piston pump, a water-lubricated axial piston pump, etc.

[0040] Combine Figure 2 、 Figure 3 As shown, during operation, the electric three-way ball valve is controlled by a control device, switching it to a closed or open position according to different signals. In the normal standby state, the electric three-way ball valve is in the closed position (i.e., position ad), preventing foam liquid from entering the foam liquid pump and preventing the foam liquid from corroding the foam liquid pump. In the event of a fire, the control system receives a fire alarm signal and the foam liquid tank liquid level signal is normal, i.e., above the low liquid level. At this time, the electric three-way ball valve switches to the open state of the foam liquid passage, i.e., ports ab are connected, and the foam liquid pump outputs foam liquid, which is mixed with fire water to output the foam mixture, enabling foam spray fire extinguishing. When the foam liquid in the foam liquid tank is used up, the foam liquid tank liquid level signal is at a low liquid level, and the flow and pressure signals at the hydraulic unit outlet are normal, the control system automatically controls the water inlet passage to open, i.e., port bc is connected, allowing fire water to enter the foam liquid pump, preventing dry wear and damage to the foam liquid pump and also allowing the foam liquid pump to be flushed. At this time, the entire system outputs only fire water, implementing water spray fire extinguishing.

[0041] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding, characterized by: It includes a proportioning mixing device, a foam liquid tank and a control device; The proportion mixing device comprises a hydraulic unit, a foam liquid pump, a fire water main, a mixed liquid main and an electric three-way ball valve, wherein the fire water main is connected to the water inlet of the hydraulic unit, the water outlet of the foam liquid pump is connected to the fire water main, the water inlet of the foam liquid pump is connected to the fire water main via an electric three-way ball valve, and the mixed liquid main is connected to the water outlet of the hydraulic unit; The water outlet of the foam liquid tank is connected to an electric three-way ball valve; The control device is connected with the foam liquid cabinet and the proportion mixing device respectively.

2. The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding according to claim 1 is characterized in that: The fire water main is provided with a water inlet pressure sensor.

3. The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding according to claim 2 is characterized in that: The mixed liquid main pipe is provided with a mixed liquid end water flow sensor and a mixed liquid end pressure sensor.

4. The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding according to claim 1 is characterized in that: A foam liquid check valve is arranged on a liquid outlet pipe connected to the fire water main pipe at the water outlet end of the foam liquid pump.

5. The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding according to claim 1 is characterized in that: The driving force is transmitted between the hydraulic unit and the foam liquid pump via a coupling.

6. The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding according to claim 1, characterized in that: A water supply filter is arranged on the water supply branch pipe connected to the electric three-way ball valve and the fire water main pipe.

7. The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding according to claim 1 is characterized in that: A liquid supply filter is arranged on the foam liquid pipe whose water outlet end of the foam liquid cabinet is connected to the electric three-way ball valve.

8. The foam and water spray dual fire extinguishing system with energy recovery and anti-dry grinding according to claim 7, characterized in that: The foam liquid tank is provided with a liquid level sensor.

Images