A mobile adaptive pressure-boosting fire pump system

Abstract

The present invention provides a mobile adaptive booster fire pump system, which belongs to the technical field of fire fighting equipment. With the development of cities, buildings are becoming more and more dense, and the height of buildings is also increasing. In some areas with narrow roads, fire trucks are difficult to deploy at the fire scene in a limited space, and the fixed water supply system at the scene also has problems such as insufficient pressure and insufficient distance. The present invention provides a mobile adaptive booster fire pump system, including a bracket, a fuel tank and a fire pump. The whole system has a high degree of integration, is easy to transport, store, deploy and move, can be quickly delivered to the fire scene, and can be quickly deployed and implemented in fire fighting scenarios with limited conditions, providing continuous and stable water pressure output, which is conducive to the rapid control of the fire.

Description

Technical Field

[0001] The invention belongs to the technical field of fire fighting equipment, and in particular relates to a mobile self-adaptive booster fire fighting pump system. Background Art

[0002] With the development of cities, buildings are becoming more and more densely packed and their heights are also increasing. In some areas with narrow roads, fire trucks are difficult to deploy at the fire scene in limited space. The fixed water supply system at the scene also has problems such as insufficient pressure and insufficient distance. At this time, a booster pump or relay pump system is needed.

[0003] Booster pumps or relay pumps are usually of two types: electric and oil-powered. For large-capacity electric booster pumps, the motor power is too large. On the one hand, the lines and capacity of the power supply at the fire scene are difficult to meet the use conditions; on the other hand, for safety reasons, the use of electricity at the fire scene itself may also be limited. In related technologies, large-capacity oil-powered booster pumps need to use high-power engines to provide sufficient boosting power. They are often large in size, heavy in weight, noisy, and have very high corresponding fuel consumption. However, at the actual fire scene, rapid deployment and fuel saving are crucial to fire control.

[0004] In actual fire rescue work, water source is of paramount importance. Due to the water pressure and location of the on-site fire hydrants, water source pressurization and relay are indispensable links. Among the existing related technologies, large-capacity, high-power booster fire pump systems are large in size, heavy in weight, and noisy in noise. In addition, the fuel consumption is also very high, and there is no extra space to set up a large fuel tank, which makes transportation, storage, deployment, and movement inconvenient. There are also problems such as short battery life and high noise during use, which is not conducive to fire rescue work. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a mobile adaptive booster fire pump system to solve the problems in the prior art that large-capacity, high-power booster fire fighting systems are inconvenient to transport, store, deploy, and move, and also have short battery life and affect the normal operation of the fire pump during refueling, which is not conducive to fire rescue work.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a mobile adaptive booster fire pump system, comprising a bracket, a fuel tank and a fire pump, wherein the fire pump and the fuel tank are mounted on the bracket, the fire pump comprises an engine, a coupling and a pump body, the pump body comprises a pump body, a main water inlet pipe and a main water outlet pipe, and the pump body is connected to the engine through the coupling and obtains power;

[0007] The oil tank comprises a first oil tank portion, a second oil tank portion and a third oil tank portion, wherein the first oil tank portion is located outside the pump body and the main water outlet pipe, the second oil tank portion is located outside the pump body and the main water inlet pipe, and the third oil tank portion is located above the pump body, the first oil tank portion and the second oil tank portion, and the first oil tank portion, the second oil tank portion and the third oil tank portion are connected to each other to form a cavity structure surrounding the pump body, the inner side of the cavity structure accommodates the pump body, and the outer side is a regular surface;

[0008] The tops of the first oil tank section and the second oil tank section are both provided with quick-insert sealing joints, and the bottom of the third oil tank section is also provided with a quick-insert sealing joint, which cooperates with the quick-insert sealing joints of the first oil tank section and the second oil tank section;

[0009] The first oil tank part is also provided with a through hole, one side of the through hole is aligned with the input shaft of the pump body, and the other side of the through hole is aligned with the output shaft of the engine, and the coupling passes through the through hole and connects the pump body and the engine;

[0010] The first oil tank section and the second oil tank section supply oil to the engine through the oil channels of the two two-channel interlocking valves respectively. The tops of the first oil tank section and the second oil tank section are both connected to air pressure balance pipes, which are respectively connected to the air pressure channels corresponding to the two-channel interlocking valves and then connected to the top of the third oil tank section.

[0011] An oil and gas filter is provided on the top of the third oil tank portion.

[0012] Optionally, it also includes an external oil tank, which includes an elastic diaphragm, a water inlet, an oil inlet and an oil outlet, the elastic diaphragm divides the interior of the external oil tank into an oil storage area and a water storage area, the water inlet is arranged at the upper part of the water storage area, the oil inlet and the oil outlet are respectively arranged at the upper part and the lower part of the oil storage area, and the oil outlet is connected to the third oil tank part and supplies oil to it.

[0013] Optionally, a direct cooling system is also included;

[0014] The direct cooling system includes a cooling water inlet pipe and a cooling water outlet pipe;

[0015] The cooling water inlet pipe draws water from the water outlet end of the pump body and flows into the engine;

[0016] One end of the cooling water outlet pipe is connected to the cooling water outlet of the engine, and the other end is connected to the water inlet end of the pump body.

[0017] Optionally, an indirect cooling system is also included;

[0018] The indirect cooling system includes a heat exchanger, an internal circulation loop, a circulation pump and an external circulation loop;

[0019] The circulation pump is located in the internal circulation loop and provides power for the internal circulation loop;

[0020] The inner circulation loop and the outer circulation loop both flow through the heat exchanger and perform heat exchange in the heat exchanger;

[0021] The internal circulation loop also flows through the engine and removes heat from the engine;

[0022] The external circulation loop draws water from the water outlet of the pump body, flows through the heat exchanger and flows out to the water inlet of the pump body after heat exchange.

[0023] Optionally, the pump body also includes a bypass diverter pipe and a diverter valve, one end of the bypass diverter pipe is connected to the main water inlet pipe, and the other end is connected to the main water outlet pipe. The diverter valve is arranged at the connection between the bypass diverter pipe and the main water inlet pipe, and is used to control the water at the main water inlet pipe to flow into the pump body or into the bypass diverter pipe.

[0024] Optionally, it also includes a first pressure sensor, a second pressure sensor, a rotation speed sensor and a controller;

[0025] The first pressure sensor is located at the inlet of the main water inlet pipe, and the second pressure sensor is located at the water outlet of the pump body. The first pressure sensor and the second pressure sensor are used to detect the fluid pressure at their respective locations;

[0026] The speed sensor is located on the shaft of the coupling and is used to detect the speed of the engine output shaft;

[0027] The controller includes a wireless receiver and a plurality of electrical interfaces. The controller is connected to the engine via the electrical interfaces to control the engine. The wireless receiver is used to receive control signals transmitted from a remote controller.

[0028] Optionally, the angles of the bypass shunt pipe and the connection positions of the main water inlet pipe and the main water outlet pipe are all less than 30°;

[0029] The cross-sectional area ratio of the main water inlet pipe to the main water outlet pipe is between 1.2 and 1.8, the inner diameter of the bypass diverter pipe gradually decreases along the water flow direction, and at least one guide blade is provided at the inlet of the bypass diverter pipe.

[0030] Optionally, the engine is an aviation piston engine, including a body, an exhaust pipe, a protective cover and a silencer. The body is mounted on the bracket via a vibration-damping structure, and the protective cover is connected to the engine and completely wraps the exhaust pipe and the silencer inside.

[0031] Optionally, it also includes a roller and a handle, wherein the roller is arranged at the bottom of the bracket, and the handle is arranged at the side of the bracket.

[0032] Optionally, a battery module is also included, and the battery module is a rechargeable battery. The battery module is used to power the sensor and the controller, and the battery module can be charged when the engine is running.

[0033] As described above, the mobile adaptive booster fire pump system of the present invention has at least the following beneficial effects:

[0034] High integration and easy and rapid deployment. A mobile adaptive booster fire pump system of the present invention includes a bracket, a fuel tank and a fire pump. The fire pump and the fuel tank are both arranged on the bracket. The fuel tank is designed and laid out according to the system space, effectively utilizing the space on the bracket. The fuel tank capacity is larger, the entire system has a high degree of integration, a regular shape, and is easy to transport, store, deploy and move. It can be quickly delivered to the fire scene, and can be quickly deployed and implemented in fire-fighting scenarios with limited conditions, providing continuous and stable water pressure output, which is conducive to the rapid control of the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Shown is an overall schematic diagram of a mobile adaptive pressure-boosting fire pump system of the present invention.

[0036] Figure 2 Shown is an overall schematic diagram of a mobile adaptive pressure-boosting fire pump system of the present invention.

[0037] Figure 3 Shown is a schematic diagram of a mobile adaptive pressure-boosting fire pump system without an oil tank according to the present invention.

[0038] Figure 4 Shown is a schematic diagram of the oil tank portion of a mobile adaptive pressure-boosting fire pump system of the present invention.

[0039] Figure 5 Shown is a schematic diagram of a mobile adaptive pressure-boosting fire pump system excluding a third oil tank portion of the present invention.

[0040] Figure 6 Shown is a schematic diagram of the oil tank connection of a mobile adaptive booster fire pump system of the present invention.

[0041] Figure 7 Shown is a cross-sectional schematic diagram of a two-channel interlock valve.

[0042] Figure 8 Shown is a schematic diagram of a fire pump of a mobile adaptive pressure-boosting fire pump system of the present invention.

[0043] Fig. 9Shown is a schematic diagram of a fire pump of a mobile adaptive pressure-boosting fire pump system of the present invention.

[0044] Fig.10 Shown is a schematic top view of a fire pump of a mobile adaptive pressure-boosting fire pump system of the present invention.

[0045] Fig.11 Shown is a schematic diagram of direct cooling of a mobile adaptive booster fire pump system according to the present invention.

[0046] Fig.12 Shown is a schematic diagram of indirect cooling of a mobile adaptive booster fire pump system according to the present invention.

[0047] Fig.13 A schematic diagram showing the position of guide vanes of a mobile adaptive pressure-boosting fire pump system according to the present invention.

[0048] Among them: bracket 101, roller 1011, handle 1012, battery module 102, fuel tank 103, first fuel tank part 1031, through hole 10311, second fuel tank part 1032, third fuel tank part 1033, protective cover 104, vibration reduction structure 105, engine 11, body 111, exhaust pipe 112, silencer 113, exhaust outlet 1131, coupling 12, pump body 13, main water inlet pipe 131, main water outlet pipe 132, bypass shunt pipe 133, guide vane 1331, guide valve 134, direct cooling system 14, throttle valve 141, cooling Water outlet pipe 142, cooling water inlet pipe 143, indirect cooling system 15, throttle valve 2 151, heat exchanger 152, internal circulation loop 153, circulation pump 154, external circulation loop 155, controller 16, first pressure sensor 17, second pressure sensor 18, external oil tank 1034, elastic diaphragm 10341, water filling port 10342, oil filling port 10343, quick-plug sealing joint 1035, oil and gas filter 1036, air pressure balance pipe 1037, two-channel interlocking valve 1038, air pressure channel 10381, oil channel 10382, switching rod 10383. DETAILED DESCRIPTION

[0049] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0050] See also Figures 1 to 13. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0051] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0052] For this example, please refer to Figure 1-Figure 3 The oil tank 103 includes a first oil tank portion 1031, a second oil tank portion 1032 and a third oil tank portion 1033, wherein the first oil tank portion 1031 is located outside the pump body and the main water outlet pipe 132, the second oil tank portion 1032 is located outside the pump body and the main water inlet pipe 131, and the third oil tank portion 1033 is located above the pump body 13, the first oil tank portion 1031 and the second oil tank portion 1032, and the first oil tank portion 1031, the second oil tank portion 1032 and the third oil tank portion 1033 are connected to each other to form a cavity structure surrounding the pump body 13, the inner side of the cavity structure accommodates the pump body 13, and the outer side is a regular surface;

[0053] Combination Figure 5 The first oil tank part 1031 and the second oil tank part 1032 are both provided with a quick-insert sealing joint 1035 at the top, and the third oil tank part 1033 is also provided with a quick-insert sealing joint 1035 at the bottom, and cooperates with the quick-insert sealing joint 1035 of the first oil tank part 1031 and the second oil tank part 1032;

[0054] The first oil tank portion 1031 is further provided with a through hole 10311, one side of the through hole 10311 is aligned with the input shaft of the pump body 13, and the other side is aligned with the output shaft of the engine 11, and the coupling 12 passes through the through hole 10311 and connects the pump body 13 and the engine 11;

[0055] Further integration Figure 6 and Figure 7The first oil tank section 1031 and the second oil tank section 1032 supply oil to the engine 11 through the oil channels 10382 of the two two-channel interlocking valves 1038 respectively. The tops of the first oil tank section 1031 and the second oil tank section 1032 are both connected with an air pressure balance pipe 1037. The two air pressure balance pipes 1037 are respectively connected to the air pressure channels 10381 corresponding to the two-channel interlocking valves 1038, and then connected to the top of the third oil tank section 1033.

[0056] An oil and gas filter 1036 is disposed on the top of the third oil tank portion 1033 .

[0057] Using water to extinguish fire is the most convenient and economical way to do firefighting. Buildings are generally required to be equipped with fire hydrant interfaces for firefighting water. However, with the development of cities, buildings are becoming more and more dense, and there are more and more high-rise buildings, making high-rise firefighting more difficult. The main reason is that high-rise firefighting requires high water pressure, which requires a stronger water pressure source. However, the fire hydrants that come with buildings are usually not equipped with such a strong pressure water source. This is due to technical reasons and economic considerations.

[0058] Usually, when spraying water on the lower floors of a building, the water source of a fire hydrant may be used directly. However, when spraying water on the middle and upper floors, in order to allow the water flow to reach the fire point, a booster pump or relay pump is generally added between the terminal fire sprinkler and the fixed fire hydrant water source. In the existing related technology, in order to obtain a better boosting effect, a high-power engine is generally used, which results in a large size and heavy weight of the booster pump, and a lot of noise during operation. In addition, due to the high power, the fuel consumption is also fast, and refueling is required from time to time, which affects the on-site fire fighting work. Moreover, the existing high-power engines and pump bodies are irregular in shape. After being integrated together, the entire system is huge in size, and it is inconvenient to transport and deploy, which has an adverse effect on fire control.

[0059] In the prior art, in order to meet the pressure requirements of the terminal fire extinguishing facilities, the general engine has a large power and high fuel consumption. Specifically in the application scenario of fire fighting, it is required to quickly deploy the booster pump and implement the fire fighting work. Therefore, the weight and volume of the booster pump and its supporting facilities are correspondingly limited. Under the combined influence of high fuel consumption, small volume and light weight, the fuel tank of the existing booster pump and its supporting facilities system is also designed to be relatively small. In continuous fire fighting, uninterrupted fuel replenishment is required. In specific operations, one way is to stop the engine for refueling, and the other is to keep the engine running for refueling.

[0060] Among them, the method of stopping the engine for refueling will inevitably lead to the interruption of the boost pump output, which will have a negative impact on fire control; while in the method of non-stop refueling, due to the volatile nature of gasoline, when refueling in the open, the oil and gas evaporate into the air and come into contact with the sparks of the high-temperature engine and exhaust system, which may cause danger. Especially at the fire scene, flammable and explosive items should be isolated, and frequent refueling will undoubtedly expose the volatile fuel directly to the air, seriously increasing the safety risks on site.

[0061] In order to provide sufficiently large boost performance, the engine and pump body are large in size, and the engine and pump body casings are irregular in shape. After the engine and pump body are integrated into the bracket, a large amount of space has been occupied, and the space utilization rate itself is not high. In addition, the engine itself has high power consumption. In order to improve the continuous output capacity, the capacity requirement of the fuel tank is also high. If a regular large fuel tank is added, the volume of the entire adaptive fire boosting system will be greatly expanded.

[0062] In this embodiment, the original space is fully utilized, and combined with the low space utilization rate due to the special shape of the engine and pump body, the fuel tank is designed into multiple parts. The internal cavity accommodates the pump body and part of the engine structure, and the outside forms a regular plane structure, making the storage and transportation of the entire system more convenient, and also easy to accommodate in the fire truck, so that it can be quickly delivered to the scene and provide continuous output.

[0063] Specifically, it includes improvements in structure and connection methods. Structurally, please refer to Figure 4 and Figure 5 The multiple oil tank parts are independently designed and modularly installed with each other. In the simplest implementation, the system includes only one oil tank part, namely the first oil tank part 1031. At this time, the pump body 13 and the engine 11 are respectively located on both sides of the first oil tank part 1031. The first oil tank part 1031 is provided with a through hole 10311, and the coupling 12 just passes through the through hole 10311 to connect the power of the pump body 13 and the engine 11. In the present embodiment, through the special layout of the pump body 13, the engine 11, the first oil tank portion 1031 and the coupling 12, full use is made of the fact that the engine 11 is a special-shaped structure and has a large volume, and the pump body 13 also has a large expansion volume because it needs to connect the inlet and outlet water pipes, but the coupling 12 connecting the two has a small diameter. The first oil tank portion 1031 is arranged between the pump body 13 and the engine 11, and a through hole 10311 is provided on the first oil tank portion 1031 to allow the coupling 12 to pass through. Without increasing the overall space occupancy of the system, the components are cleverly arranged and the structural characteristics of each component are fully utilized, thereby increasing the integration of the system and reducing the volume of the system, bringing convenience to the storage, transportation, and deployment of the entire system, which is of great significance for rapid rescue in emergency scenarios.

[0064] On the basis of the above-mentioned first oil tank part 1031, the present embodiment can further install the second oil tank part 1032 in a modular manner. The second oil tank part 1032 makes full use of the structure of the water pump. Specifically, the tail of the water pump is connected to the engine 11, and the first oil tank part 1031 has been installed on this side. The water inlet and outlet ends of the water pump largely occupy a side end and the opposite end of the second oil tank part 1032. However, the opposite side of the main water outlet pipe 132 of the water pump is relatively simple, without structures such as water pipes. The second oil tank part 1032 is arranged on this side. The second oil tank part 1032 can have a relatively regular structure to make full use of the space.

[0065] For connection methods, see Figure 6 The first fuel tank section 1031 and the second fuel tank section 1032 supply fuel to the engine 11 through two pipelines respectively, and the two pipelines can be independently controlled by two two-channel interlocking valves 1038. When the system only has the first fuel tank section 1031, it can still operate normally, and can be as lightweight and easy to deploy as possible; after the system adds the second fuel tank section 1032, the two fuel tank sections can back up each other. When one of the fuel tanks is refueled, the other fuel tank can supply fuel to the engine, avoiding the engine working while refueling or stopping for refueling. In addition, the second fuel tank section 1032 also multiplies the system's endurance and can improve the continuous output capacity of the fire extinguishing system. On this basis, when necessary, the two two-channel interlocking valves 1038 can also be used to cooperate in discharging the fuel in the tank.

[0066] In this embodiment, the main reason why the water pump has a special-shaped structure and occupies a large space is that the main water inlet pipe 131 and the main water outlet pipe 132 have extension directions, but the volume of the water pump body is relatively small, and the axis of the water pump body, the main water inlet pipe 131 and the main water outlet pipe 132 are almost located in the same horizontal plane, that is, the water pump mainly occupies a large space in the direction where the main water inlet pipe 131 and the main water outlet pipe 132 extend, while the upper and lower sides occupy less space. In the prior art, the upper side space of the water pump is almost unusable, and the volume of the oil tank increases significantly after being arranged separately. In this embodiment, the third oil tank part 1033 is arranged on the upper part of the pump body 13, the first oil tank part 1031 and the second oil tank part 1032, and the layout is further made use of the structural characteristics of the system components, effectively improving the space utilization rate, increasing the oil tank capacity, and improving the continuous output capacity of the system.

[0067] And the third oil tank part 1033 realizes hot-swap quick docking and disassembly with the first oil tank part 1031 and the second oil tank part through the quick plug sealing joint 1035, which greatly facilitates the deployment efficiency of the fire pump system. The characteristic of the quick plug sealing joint 1035 is that when the quick plug sealing joints 1035 at both ends are docked, the two docked parts will form a connecting loop, and when the docking ends are pulled out and separated, both ends will be automatically sealed. It belongs to the prior art and will not be repeated here. In the above embodiment, the three oil tank parts are modularly installed, and only the first oil tank part 1031 can be installed, and then the second oil tank part 1032 can be added, and then the third oil tank part 1033 can be added. Streamline the volume and install on demand; the first oil tank part 1031 and the second oil tank part 1032 can also form a backup between each other to achieve refueling without stopping the machine; the third oil tank part 1033 is located at the top and adopts a quick plug connection method, which can be quickly removed, leaving more maintenance space, convenient for maintenance and connection of the pump body pipeline.

[0068] When installing the third oil tank section 1033, first close the two-channel interlock valve 1038, at which time the oil channel 10382 of the two-channel interlock valve 1038 is closed and the air pressure channel 10381 is opened. If the third oil tank section 1033 is empty, the air pressure of the third oil tank section 1033 and the lower oil tank will be automatically balanced; if there is oil in the third oil tank section 1033, due to the gravity of the oil itself, the pressure between the upper and lower oil tanks needs to be automatically balanced through the air pipe, and at this time, the oil in the third oil tank section 1033 located at the upper part will automatically enter the oil tank located at the lower part; after the upper oil tank is installed, the two-channel interlock valve 1038 can be opened to supply oil to the engine.

[0069] See also Figure 7The two-channel interlocking valve 1038 includes an air pressure channel 10381 and an oil channel 10382. The two channels are interlocked and switched by the switching rod 10383. When one channel is opened, the other channel will be closed. The air pressure balance pipe 1037 cooperates with the air pressure channel 10381. When the oil channel 10382 is closed, the air pressure channel 10381 is opened, and an air pressure balance is formed between the upper oil tank and the lower oil tank. The oil in the upper oil tank can be added to the lower oil tank; when the oil channel 10382 of the two-channel interlocking valve 1038 is opened, the oil channel 10382 is connected and the air pressure channel 10381 is closed. At this time, when the oil tank in the lower part is consumed, the third oil tank part 1033 in the upper part will automatically replenish the lower oil tank accordingly, and the two oil tanks are substantially connected as a whole. In this case, when the oil in the lower tank is not consumed, even if there is only a small amount of oil in the lower tank and there is oil in the upper tank, the oil in the upper tank will not automatically flow into the lower tank, so that the amount of oil in the lower tank can be controlled as needed, so that the lower tank will not always be filled by the upper tank. Specifically, the oil channel 10382 of the two-channel interlock valve 1038 is closed to cut off the oil supply to the engine, and the air pressure channel 10381 is opened, and the upper tank will start to refuel the lower tank. The two-channel interlock valve 1038 can be switched at the right time to stop refueling to maintain the capacity of the lower tank and enter the oil supply mode.

[0070] While the internal air pressure of the multiple oil tanks is balanced, the oil and gas filter 1036 is also balanced with the external atmosphere. The oil and gas filter 1036 can filter the oil and gas in the air. When the engine absorbs oil or the oil and gas in the oil tank volatilize to form a pressure difference between the inside of the oil tank and the external atmosphere, the gas can enter or leave the oil tank through the oil and gas filter 1036. At the same time, the oil and gas filter 1036 can filter out the volatilized mixed oil and gas in the gas to prevent the oil and gas from overflowing to the outside, which not only avoids waste, but also avoids additional safety hazards for fire fighting.

[0071] For this example, please refer to Figure 2 , Figure 4 and Figure 6 , and also includes an external oil tank 1034, the external oil tank 1034 includes an elastic diaphragm 10341, a water injection port 10342, an oil injection port 10343 and an oil outlet, the elastic diaphragm 10341 divides the interior of the external oil tank 1034 into an oil storage area and a water storage area, the water injection port 10342 is arranged at the upper part of the water storage area, the oil injection port 10343 and the oil outlet are respectively arranged at the upper part and the lower part of the oil storage area, and the oil outlet is connected to the third oil tank part 1033 and supplies oil to it.

[0072] In the previous embodiments, one of the important improvements is to cleverly modularize the design and layout of the fuel tank according to the structural shape of the engine and water pump, as well as the requirements for the layout of the inlet and outlet water pipes. Without increasing the original space occupancy of the system, the space utilization rate is fully developed, the fuel tank capacity is increased, and the endurance of the fire pump system is improved. At the same time, the appearance of the entire fire pump system is changed from irregular to more regular; the enclosed and detachable design of multiple fuel tanks also facilitates maintenance and deployment.

[0073] However, even so, the capacity of the oil tank is still limited, and it is difficult to meet the continuous high-power output in some fire-fighting scenarios. In this embodiment, the external oil tank 1034 can provide the system with continuous and continuous oil supply. The external oil tank 1034 can be transported and stored independently of the system, and can be large in volume and capacity. When oil supply is needed, water can be drawn from the main water outlet pipe 132 to allow the water flow to enter the water storage area. The pressure of the water flow squeezes the elastic diaphragm 10341, and the elastic diaphragm 10341 expands and squeezes the oil storage area. The oil in the oil storage area is pressurized into the third oil tank part 1033, and the air in the third oil tank part 1033 is discharged to the outside through the oil and gas filter 1036, thereby achieving continuous oil supply and oil tank pressure balance.

[0074] The beneficial effect of the above scheme compared to the prior art is that oil can be continuously supplied from an external large oil tank, and when supplying oil, the oil will not come into contact with the air, and no oil gas will evaporate into the air at the fire scene; in addition, there is no need to lift the oil tank or use an oil pump when refueling, but the water pressure of the main water outlet pipe 132 is directly used as power to achieve continuous and non-volatile refueling. When firefighting, local materials can be used for easy implementation, which provides a strong guarantee for firefighting work.

[0075] For further information, see Fig.11 , this embodiment also includes a direct cooling system 14;

[0076] The direct cooling system 14 includes a cooling water inlet pipe 143 and a cooling water outlet pipe 142;

[0077] The cooling water inlet pipe 143 draws water from the water outlet end of the pump body 13 and flows into the engine 11;

[0078] One end of the cooling water outlet pipe 142 is connected to the cooling water outlet of the engine 11 , and the other end is connected to the water inlet end of the pump body 13 .

[0079] During specific implementation, the cooling water pipe can be installed at the water outlet or water inlet of the pump body, or can be installed on the water outlet pipe and water inlet pipe of the pump body, which are essentially the same.

[0080] When the pump is in operation, the pressure at the main water outlet will be greater than the pressure at the main water inlet. At this time, a liquid pressure difference is formed at both ends of the cooling circuit, and water will automatically enter the cooling circuit from the main water outlet, flow through the engine, and then flow back to the main water inlet from the cooling water outlet, thus forming a cooling circuit, which continuously brings cold water into the engine for heat exchange, and can also automatically adjust the cooling water flow rate according to the engine power, that is, the pressure difference at both ends of the main water outlet and the main water inlet. The greater the power, the greater the pressure difference, and the greater the cooling water flow rate. The cooling circuit structure of this method is simple and completely spontaneous, and can also be automatically adjusted according to the engine power, with high reliability, low cost, and good heat exchange effect.

[0081] As a further solution of this embodiment, a throttle valve 141 can be provided in the cooling circuit as a flow control component to control the flow of the coolant, which has the effect of reducing the loss of the main boost circuit. Specifically, when the pressure difference between the outlet and inlet water of the pump is large, the flow of the cooling circuit will also be large accordingly, and may even far exceed the actual cooling water flow required by the engine. If it is not restricted at this time, the loss of the main circuit will increase unnecessarily.

[0082] Optionally, this embodiment also provides another cooling method, see Fig.12 , including an indirect cooling system 15;

[0083] The indirect cooling system 15 includes a heat exchanger 152, an internal circulation loop 153, a circulation pump 154 ​​and an external circulation loop 155;

[0084] The circulation pump 154 ​​is located in the inner circulation loop 153 and provides power for the inner circulation loop 153;

[0085] The inner circulation loop 153 and the outer circulation loop 155 both flow through the heat exchanger 152 and perform heat exchange in the heat exchanger 152;

[0086] The internal circulation loop 153 also flows through the engine 11 and removes heat from the engine 11;

[0087] The external circulation loop 155 draws water from the water outlet of the pump body 13 , flows through the heat exchanger 152 , and then flows out to the water inlet of the pump body 13 after heat exchange.

[0088] In the indirect cooling method, the coolant in the engine does not participate in the circulation of the fluid in the pump body. The flow power of the coolant in the engine is provided by the circulation pump, and the power of the external circulation is the same as that of the previous embodiment. The external water source of this embodiment does not enter the engine, but heat is exchanged through two coolant circulation loops. The advantage is that the application range is wider and the engine maintenance is simple.

[0089] Specifically, the engine's internal circulation cooling circuit is a self-contained system with closed flow, so oil or special coolant can be used. Compared with water, this type of coolant can effectively prevent corrosion and rust of components in the cooling circuit device, play a better protective role, and reduce engine maintenance costs. On the other hand, the water flow in the external circulation loop will not enter the engine, and in a fire-fighting environment with poor water quality, mud, microorganisms and algae in the water will not enter the engine. Therefore, its scope of use is wider and is almost not restricted by water quality.

[0090] As a further solution of this embodiment, a throttle valve 151 can be set in the external circulation loop as a flow control component to control the flow of the coolant. The effect of this is to reduce the loss of the main boost circuit. Specifically, when the difference between the outlet water pressure and the inlet water pressure of the pump is large, the flow of the cooling circuit will also be large accordingly, and may even far exceed the actual cooling water flow required by the engine. If it is not restricted at this time, the loss of the main circuit will increase unnecessarily.

[0091] For this example, please refer to Figure 8 The pump body 13 also includes a bypass shunt pipe 133 and a diversion valve 134. One end of the bypass shunt pipe 133 is connected to the main water inlet pipe 131, and the other end is connected to the main water outlet pipe 132. The diversion valve 134 is arranged at the connection between the bypass shunt pipe 133 and the main water inlet pipe 131, and is used to control the water inlet at the main water inlet pipe 131 to flow into the pump body 13 or into the bypass shunt pipe 133.

[0092] In specific implementation, the adaptive fire boosting system is generally connected to the middle of the water pipe. Specifically, one end of the water pipe is connected to a fixed fire hydrant, and the other end is connected to the terminal water spraying device to provide it with a high-pressure water source. During the fire fighting process, sometimes it is necessary to spray water on the high area, and sometimes it is necessary to spray water on the low area, so the demand pressure at the end is generally dynamic.

[0093] In the above process, if the pressure of the fixed fire hydrant is sufficient, there is no need to increase the pressure. At this time, the fire pump can be stopped or removed. However, considering the urgency of the actual fire extinguishing scene and the dynamic nature of the water pressure demand, it is not advisable to remove the fire pump directly to connect the water pipe; on the other hand, if the fire pump is simply shut down and the water flow is allowed to pass through the fire pump, the blades in the pump and the engine connected to the blades will become the load of the water flow, thereby wasting the water flow energy; the fire pump can also be kept running, but this will increase the energy consumption of the system. The engine has high energy consumption and small fuel tank space. Saving energy consumption is very important to improve the continuous output capacity of the fire pump.

[0094] In this embodiment, the bypass diverter pipe and the diversion valve effectively solve the above problems. When boosting is required, the pump circuit is switched; when boosting is not required, the bypass diverter pipe circuit is switched. This takes into account both boosting and energy-saving effects, improves the continuous output capacity of the fire pump, and reduces the loss of water pressure during bypass diversion.

[0095] For this example, please refer to Fig.10 , the adaptive fire boost system also includes a first pressure sensor 17, a second pressure sensor 18, a rotation speed sensor and a controller 16;

[0096] The first pressure sensor 17 is located at the inlet of the main water inlet pipe 131, and the second pressure sensor 18 is located at the water outlet of the pump body 13. The first pressure sensor 17 and the second pressure sensor 18 are used to detect the fluid pressure at the respective positions;

[0097] The speed sensor is located on the shaft of the coupling 12 and is used to detect the speed of the output shaft of the engine 11;

[0098] The controller 16 includes a wireless receiver and a plurality of electrical interfaces. The controller 16 is connected to the engine 11 via the electrical interfaces to control the engine 11. The wireless receiver is used to receive control signals transmitted from a remote controller.

[0099] The adaptive fire-fighting boosting system of this embodiment includes two working modes: boosting and bypass. As for which mode to use, it needs to be comprehensively determined based on the water inlet pressure and the required pressure at the water outlet. The most primitive way is to manually sense the water pressure. If you think the original water inlet pressure is sufficient, switch to the bypass mode. If you think the original water inlet pressure is insufficient, switch to the boosting mode. This method is indeed feasible in some scenarios, but when the pipeline is complex, especially when the pipeline has no direct output but is connected to other pipelines, such as when there are multiple boosting systems in the middle of the pipeline, the operator cannot perceive the water pressure in the middle of the pipe.

[0100] In this embodiment, pressure sensors are added on both sides of the booster pump. The water pressure data is obtained by the pressure sensors, which makes it easier to determine the working mode required by the booster pump. At the same time, collecting water pressure data through sensors also makes it easier to monitor the pipeline, pump body, and conditions inside the pipe, thereby simplifying the pipeline loop inspection and troubleshooting process.

[0101] When in boost mode, the amount of boost required is determined based on the output water pressure requirement and the actual input water pressure, while the specific boost effect is determined by the engine speed. The higher the speed, the more boost. A speed sensor is installed on the shaft of the coupling to detect the engine speed, thereby obtaining the engine's output state, forming a closed loop between the control parameters and the actual action effect, which is conducive to the precise control of the engine power and speed, thereby adjusting the boost effect.

[0102] The controller is equipped with a wireless receiver, which can facilitate remote adjustment of the output power. For example, during the firefighting process, firefighters can carry the remote control with them and adjust the output power according to the height of the fire point to be extinguished without having to reach the side of the fire pump, which is conducive to the steady progress of the firefighting work.

[0103] For this example, please refer to Fig.10 The angles of the bypass diverter pipe 133 and the connection positions with the main water inlet pipe 131 and the main water outlet pipe 132 are all less than 30°.

[0104] A curved pipe will reduce the fluid pressure inside the pipe, and the smaller the angle of the bend, the more obvious the pressure reduction. One of the reasons is that when the fluid flows through the bend of the pipe, the fluid inside and outside the bend have different flow paths, resulting in speed differences between water molecules, and even forming dead water areas or vortex areas when flowing through the bend. The liquid in this area does not participate in the main flow, but keeps swirling, accelerating the friction between the liquids, causing particle collisions, and generating local energy losses.

[0105] For medium and low pressure fluids, the angle of the bend is generally required to be no less than 90°. Taking into account the application scenario of the fire pump of this embodiment, the fluid pressure in the pipe may be relatively large. When the bypass mode is in operation, a pipe connection angle of less than 30° is equivalent to an angle of the water flow direction greater than 150°. The water flow direction changes less, which is more conducive to maintaining the pressure in the water pipe and reducing the pressure loss caused by flowing through the bypass shunt pipe of the adaptive booster pump of this embodiment.

[0106] Furthermore, the axis of the bypass shunt pipe 133 can be an arc with continuous curvature. Similar to the above principle, the curvature of the pipe itself will also cause pressure loss to the fluid inside it. The smaller the bending angle and bending radius of the pipe, the greater the pressure loss. Curvature continuity means that the curve is continuous point by point, that is, the axis of the bypass shunt pipe is a smooth curve, thereby reducing the pressure loss of the fluid in the bypass shunt pipe to an acceptable level.

[0107] In addition, the arc-shaped pipeline can connect the two ends of the bypass diversion pipe to the main water inlet pipe and the main water outlet pipe in a tangential manner.

[0108] In this embodiment, the cross-sectional area ratio of the main water inlet pipe 131 to the main water outlet pipe 132 is between 1.2 and 1.8, the inner diameter of the bypass diverter pipe 133 gradually decreases along the water flow direction, and at least one guide blade 1331 is provided at the inlet of the bypass diverter pipe 133.

[0109] The flow rates at the main inlet and main outlet of the booster pump remain unchanged, but the pressures are different. Under conditions of high-speed flow and pressure changes, cave-like corrosion damage will occur on the metal surface in contact with the fluid. This often occurs in the high-speed decompression area of ​​the pump, where cavities are formed. The cavities are crushed in the high-pressure area and generate impact pressure, which destroys the protective film on the metal surface, accelerates the corrosion rate, and then gradually expands into caves.

[0110] The flow rate of the fluid flowing through the inlet and outlet of the pump is the same. If the suction pipe is designed with a large diameter and the outlet pipe is designed with a small diameter, the flow rate of the suction pipe will be smaller than that of the outlet pipe. This can reduce the hydraulic loss of the suction pipe and prevent cavitation of the pump body. On the other hand, the smaller outlet pipe diameter design is also conducive to reducing the diameter of the rear-end pipeline and reducing the material cost of the rear-end pipeline laying.

[0111] One end of the bypass shunt pipe is connected to the main water inlet pipe, and the other end is connected to the main water outlet pipe. The gradually decreasing inner diameter is conducive to the gradual transition from the cross-section of the main water inlet pipe to the cross-section of the main water outlet pipe, avoiding the impact of sudden changes in pipe diameter on the fluid pressure.

[0112] Guide vanes are also commonly used in the air outlets of automobile air conditioners. They are generally used to change the direction of the fluid and minimize the resistance caused by the reversing to the fluid. Specifically in this embodiment, the fluid pressure in the pipeline is much greater than that in the air conditioning scenario. The guide vanes are arranged at the entrance of the bypass shunt pipe. In addition to assisting in reversing and reducing the loss of flow path switching, they also have a certain degree of protection of the pipeline. A single guide vane is a sheet structure. The guide vane is arranged at the fluid reversing position and has a guiding effect on the direction of the fluid. When high-pressure water flows in, only one side of the pipeline will be greatly impacted. After the guide vanes are arranged, it is equivalent to cutting the original pipeline into multiple water flow channels. The impact force of the water is dispersed by the guide vanes and transmitted along the guide vanes to the surrounding of the pipe diameter, reducing the impact of the high-pressure water flow on one side of the pipeline. In specific implementation, the guide vanes can be set in a grid shape or a spaced sheet structure.

[0113] For this example, please refer to Figure 1 The engine 11 is an aviation piston engine, including a body 111, an exhaust pipe 112, a protective cover 104 and a silencer 113. The body 111 is installed on the bracket 101 through a vibration reduction structure 105. The protective cover 104 is connected to the engine 11 and completely wraps the exhaust pipe 112 and the silencer 113 inside.

[0114] In the prior art, considering the storage, transportation and deployment requirements of fire pumps, only ordinary engines with relatively regular appearance can be selected. Although such engines have more regular appearance, they are less efficient and heavier.

[0115] In this embodiment, the engine adopts an aviation piston engine, which has the characteristics of light weight, small size and high power. The engine is equipped with a silencer, and a protective cover is provided outside the silencer, which greatly reduces the noise of the engine when it is working. In addition, the exhaust pipe and the silencer are wrapped by the protective cover, which also improves safety and prevents on-site personnel from accidentally touching the exhaust pipe and other high-temperature components and being burned by high temperature due to emergency fire fighting situations.

[0116] In addition, taking into account the high-power and high-fuel consumption characteristics of aviation piston engines, combined with the structure of the pump body, the fuel tank is made into a special-shaped structure with an inner cavity. The internal cavity is cleverly used so that the pump body is located just in the inner cavity, while the outside of the fuel tank can be made into a regular structure. This not only increases the fuel tank capacity and improves the continuous output capacity, but also makes the overall appearance of the device more regular, which is convenient for storage and transportation, and facilitates rapid deployment at the fire scene.

[0117] Taking advantage of the special-shaped structure of aviation piston engines, clever layout and design are carried out to make full use of the unused space due to the special-shaped engine shape. Without changing the overall space occupied by the fire pump, the fire pump has lower mass and greater power than the fire pump of the prior art at the same volume.

[0118] There are many ways to implement the vibration reduction structure, such as using vibration reduction springs or rubber pads. The aviation piston engine vibrates greatly when it is working, and it is installed on a bracket. There are also other components on the bracket. The vibration reduction structure can reduce the vibration transmitted to the bracket, protect other components, and suppress noise to a certain extent.

[0119] For this example, please refer to Figure 1 , further comprising a roller 1011 and a handle 1012 , wherein the roller 1011 is disposed at the bottom of the bracket 101 , and the handle 1012 is disposed at the side of the bracket 101 .

[0120] The bracket is provided with multiple handles, and the handles with folding function can be used. When it needs to be moved, the handles can be unfolded, and when it does not need to be moved, the handles can be folded to reduce space occupation. The rollers can be set to facilitate movement. The adaptive booster fire pump system without rollers is difficult to move, and requires multiple people to lift or forklifts and other equipment to assist in moving, which makes it difficult to deploy in a fire, which is not conducive to fire rescue work.

[0121] For this example, please refer to Figure 1, further comprising a battery module 102, wherein the battery module 102 is a rechargeable battery, and the battery module 102 is used to power the sensor and the controller, and the battery module 102 can be charged when the engine 11 is running.

[0122] The system comes with a rechargeable battery to power the control system and sensors, and is charged by the engine. The entire system can operate without any external resources except water. It has a ready-to-use feature, which facilitates rapid deployment at the fire scene, further improving the efficiency of firefighting work.

[0123] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0124] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A mobile adaptive pressure-boosting fire pump system, comprising a bracket (101), an oil tank (103) and a fire pump, wherein the fire pump and the oil tank (103) are mounted on the bracket (101), the fire pump comprises an engine (11), a coupling (12) and a pump body (13), the pump body (13) comprises a pump body, a main water inlet pipe (131) and a main water outlet pipe (132), the pump body (13) is connected to the engine (11) through the coupling (12) and obtains power, and is characterized in that: The oil tank (103) comprises a first oil tank portion (1031), a second oil tank portion (1032) and a third oil tank portion (1033); the first oil tank portion (1031) is located outside the pump body and the main water outlet pipe (132); the second oil tank portion (1032) is located outside the pump body and the main water inlet pipe (131); the third oil tank portion (1033) is located above the pump body (13), the first oil tank portion (1031) and the second oil tank portion (1032); the first oil tank portion (1031), the second oil tank portion (1032) and the third oil tank portion (1033) are connected to each other to form a cavity structure surrounding the pump body (13); the inner side of the cavity structure accommodates the pump body (13) and the outer side is a regular surface; The tops of the first oil tank section (1031) and the second oil tank section (1032) are both provided with quick-insert sealing joints (1035); the bottom of the third oil tank section (1033) is also provided with a quick-insert sealing joint (1035) which cooperates with the quick-insert sealing joints (1035) of the first oil tank section (1031) and the second oil tank section (1032); The first oil tank portion (1031) is further provided with a through hole (10311), one side of the through hole (10311) is aligned with the input shaft of the pump body (13), and the other side of the through hole (10311) is aligned with the output shaft of the engine (11), and the coupling (12) passes through the through hole (10311) and connects the pump body (13) and the engine (11); The first oil tank section (1031) and the second oil tank section (1032) supply oil to the engine (11) through the oil channels (10382) of the two two-channel interlocking valves (1038), respectively. The tops of the first oil tank section (1031) and the second oil tank section (1032) are both connected to an air pressure balance pipe (1037), and the two air pressure balance pipes (1037) are respectively connected to the air pressure channels (10381) corresponding to the two-channel interlocking valves (1038), and then connected to the top of the third oil tank section (1033); An oil and gas filter (1036) is provided on the top of the third oil tank portion (1033).

2. A mobile adaptive booster fire pump system according to claim 1, characterized in that: It also includes an external oil tank (1034), the external oil tank (1034) including an elastic diaphragm (10341), a water injection port (10342), an oil injection port (10343) and an oil outlet, the elastic diaphragm (10341) divides the interior of the external oil tank (1034) into an oil storage area and a water storage area, the water injection port (10342) is arranged at the upper part of the water storage area, the oil injection port (10343) and the oil outlet are respectively arranged at the upper part and the lower part of the oil storage area, and the oil outlet is connected to the third oil tank part (1033) and supplies oil to it.

3. A mobile adaptive booster fire pump system according to claim 1, characterized in that: Also included is a direct cooling system (14); The direct cooling system (14) comprises a cooling water inlet pipe (143) and a cooling water outlet pipe (142); The cooling water inlet pipe (143) draws water from the water outlet end of the pump body (13) and flows into the engine (11); One end of the cooling water outlet pipe (142) is connected to the cooling water outlet of the engine (11), and the other end is connected to the water inlet end of the pump body (13).

4. A mobile adaptive booster fire pump system according to claim 1, characterized in that: Also included is an indirect cooling system (15); The indirect cooling system (15) comprises a heat exchanger (152), an internal circulation loop (153), a circulation pump (154) and an external circulation loop (155); The circulation pump (154) is located in the internal circulation loop (153) and provides power for the internal circulation loop (153); The inner circulation loop (153) and the outer circulation loop (155) both flow through the heat exchanger (152) and perform heat exchange in the heat exchanger (152); The internal circulation loop (153) also flows through the engine (11) and removes heat from the engine (11); The external circulation loop (155) draws water from the water outlet of the pump body (13), passes through the heat exchanger (152), and after heat exchange, flows out to the water inlet of the pump body (13).

5. A mobile adaptive booster fire pump system as claimed in claim 1, characterized in that: The pump body (13) further comprises a bypass shunt pipe (133) and a diversion valve (134); one end of the bypass shunt pipe (133) is connected to the main water inlet pipe (131), and the other end is connected to the main water outlet pipe (132); the diversion valve (134) is arranged at the connection between the bypass shunt pipe (133) and the main water inlet pipe (131), and is used to control the water inlet at the main water inlet pipe (131) to flow into the pump body (13) or into the bypass shunt pipe (133).

6. A mobile adaptive booster fire pump system as claimed in claim 5, characterized in that: It also includes a first pressure sensor (17), a second pressure sensor (18), a rotation speed sensor and a controller (16); The first pressure sensor (17) is located at the inlet of the main water inlet pipe (131), and the second pressure sensor (18) is located at the water outlet of the pump body (13), and the first pressure sensor (17) and the second pressure sensor (18) are used to detect the fluid pressure at the respective locations; The rotation speed sensor is located on the shaft of the coupling (12) and is used to detect the rotation speed of the output shaft of the engine (11); The controller (16) comprises a wireless receiver and a plurality of electrical interfaces. The controller (16) is connected to the engine (11) via the electrical interfaces to control the engine (11). The wireless receiver is used to receive control signals transmitted by a remote controller.

7. A mobile adaptive booster fire pump system as claimed in claim 6, characterized in that: The angles at which the bypass diverter pipe (133) is connected to the main water inlet pipe (131) and the main water outlet pipe (132) are all less than 30°; and / or, The ratio of the cross-sectional area of ​​the main water inlet pipe (131) to that of the main water outlet pipe (132) is between 1.2 and 1.8, the inner diameter of the bypass diverter pipe (133) gradually decreases along the water flow direction, and at least one guide vane (1331) is provided at the inlet of the bypass diverter pipe (133).

8. A mobile adaptive booster fire pump system according to any one of claims 1 to 7, characterized in that: The engine (11) is an aviation piston engine, comprising a body (111), an exhaust pipe (112), a protective cover (104) and a silencer (113); the body (111) is mounted on the bracket (101) via a vibration reduction structure (105); the protective cover (104) is connected to the engine (11) and completely encloses the exhaust pipe (112) and the silencer (113) therein.

9. A mobile adaptive booster fire pump system according to any one of claims 1 to 7, characterized in that: It also comprises a roller (1011) and a handle (1012), wherein the roller (1011) is arranged at the bottom of the bracket (101), and the handle (1012) is arranged at the side of the bracket (101).

10. A mobile adaptive booster fire pump system according to any one of claims 1 to 7, characterized in that: It also includes a battery module (102), which is a rechargeable battery. The battery module (102) is used to power the sensor and the controller. The battery module (102) can be charged when the engine (11) is running.

Images