Foam liquid non-stop switching pipeline and foam conveying and rotating pump

Abstract

The foam liquid pipeline and the foam conveying and rotating pump are switched without shutdown, and the foam liquid is conveyed to the liquid adding outlet from the foam liquid pipeline by the pump. A three-way ball valve is arranged between the pump and the liquid adding outlet, the three-way ball valve comprises an inlet communicated with the pump, a first outlet communicated with the liquid adding outlet and a second outlet communicated with one end of the liquid return pipeline, and the three-way ball valve controls switching between the first outlet and the second outlet through rotation of a valve element of the three-way ball valve; the other end of the liquid return pipeline communicates with an inlet of the pump; when the valve element is switched to the second outlet, the foam liquid enters the liquid return pipeline through the three-way pipe, and internal circulation backflow is formed between the outlet and the inlet of the pump. According to the utility model, the three-way ball valve and the liquid return pipeline are additionally arranged, so that the internal circulation of the foam liquid can be realized under the condition that the output of the foam liquid needs to be stopped for a short time, the foam inlet pipeline and the foam outlet pipeline can be switched without shutdown, the liquid supply requirements of different foam fire fighting trucks are met, the workload of operators is reduced, and the fire extinguishing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of foam liquid switching pipeline and foam transfer pump without shutting down. Background Technology

[0002] Currently, existing foam transfer pumps mainly employ positive displacement pumps and gear pumps to meet the transportation needs of high-viscosity foam liquids. However, existing foam transfer pumps suffer from two major problems in practical applications:

[0003] Regarding outlet switching, when switching to the next fire truck after refilling one, the operator must first stop the foam transfer pump. This is because if the outlet is not closed before switching, the foam solution will flow everywhere under pressure, causing corrosion of firefighting equipment and resulting in significant waste of foam solution. Closing the outlet, however, will cause a sharp increase in pump pressure, easily damaging the equipment. Even foam transfer pumps equipped with pressure relief valves will still cause foam solution to splash when automatically depressurized due to excessive pressure, resulting in waste and environmental pollution. Therefore, the process of switching outlets by stopping the transfer pump significantly increases refilling time and affects firefighting efficiency.

[0004] Regarding the materials and usage limitations of the equipment, gear foam transfer pumps are typically made of stainless steel to avoid corrosion from the foam liquid. However, the gears made of this material have significant limitations; they cannot withstand prolonged or high-speed dry operation, otherwise gear seizure is highly likely, leading to complete equipment failure. Due to this limitation, the self-priming distance of the equipment cannot be too long, and once the foam liquid in the storage tank is pumped out, the machine must be stopped and the pump replaced. In emergency fire rescue scenarios, such cumbersome operating procedures not only easily lead to confusion and disorganization among rescue personnel, but also seriously delay firefighting opportunities and reduce firefighting efficiency. Summary of the Invention

[0005] This invention aims to solve existing problems by providing a non-stop foam liquid switching pipeline and foam transfer pump, which can meet the liquid supply needs of different foam fire trucks.

[0006] To achieve the above objectives, the technical solution adopted by this utility model includes a pump that transports foam liquid from a foam liquid pipeline to the liquid filling outlet. A three-way ball valve is provided between the pump and the liquid filling outlet. The three-way ball valve includes an inlet connected to the pump, a first outlet connected to the liquid filling outlet, and a second outlet connected to one end of the return liquid pipeline. The three-way ball valve controls the switching between the first and second outlets by rotating its valve core. The other end of the return liquid pipeline is connected to the pump inlet. When the valve core switches to the second outlet, the foam liquid enters the return liquid pipeline through the three-way pipe, forming an internal circulation backflow between the pump outlet and inlet. At this time, there is no foam liquid output from the liquid filling outlet.

[0007] The pump is a gear pump, which includes a driving gear and a driven gear that mesh with each other; the driving gear drives the driven gear to rotate and generate pressure, which outputs the foam liquid to the inlet of the three-way ball valve.

[0008] Among them, the driving gear and the driven gear are herringbone helical gears.

[0009] The driving gear is made of stainless steel, while the driven gear is made of polyetheretherketone (PEEK).

[0010] The engine that drives the pump and the three-way ball valve are connected to the controller. When the three-way ball valve is switched to the second outlet by remote / manual control, the controller synchronously reduces the engine speed, thereby reducing the pump's delivery efficiency.

[0011] The engine throttle lever is connected to an electric push rod, and the high and low speed switching of the engine throttle lever is controlled by controlling the extension and retraction of the electric push rod.

[0012] This invention also provides a foam transfer pump, including any of the foam liquid switching pipelines described above. Compared with the prior art, this invention, by adding a three-way ball valve and a return pipeline, can achieve internal circulation of foam liquid when it is necessary to temporarily stop the output of foam liquid. It enables switching of the inlet and outlet foam pipelines without stopping the machine, meeting the liquid supply needs of different foam fire trucks, avoiding the hazards of foam splashing and equipment failure, reducing the workload of operators, and improving fire extinguishing efficiency.

[0013] In addition, the engine speed can be reduced in conjunction with the pump to prevent damage due to high pressure; at the same time, new gear materials are used to achieve gear self-lubrication and meet the equipment's dry-running resistance requirements. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] Figure 2 This is a structural schematic diagram of the output foam liquid state according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the internal circulation state of the foam liquid in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the gear pump.

[0018] See attached diagram: 1. Gear pump; 2. Three-way ball valve; 3. First outlet; 4. Second outlet; 5. Pump outlet; 6. Pump inlet; 7. Foam liquid pipeline; 8. Engine; 9. Speed ​​control valve; 10. Electric push rod; 11. Drive gear; 12. Driven gear; 13. Electrical control box; 14. Return pipeline. Detailed Implementation

[0019] The present invention will now be further described in conjunction with the accompanying drawings to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0020] See Figure 1 , Figure 1 The illustration shows an embodiment of the present invention: a foam transfer pump, including a non-stop switching pipeline. This embodiment mainly includes a pump that transports foam liquid from the foam liquid pipeline to the filling outlet (connected to a foam fire truck). Specifically, see [link to details]. Figure 4 In this embodiment, the pump is a gear pump, including a housing. Inside the housing are meshing drive gears and driven gears, both arranged vertically. The housing has a liquid inlet and a liquid outlet, which are horizontally connected to the meshing points of the drive gears and driven gears, respectively, forming a conveying path for the foam liquid. When the drive gear is driven to rotate by the engine (fuel engine), it drives the driven gear to rotate synchronously, thereby generating negative pressure to output the foam liquid from the foam liquid pipeline outlet to the filling outlet.

[0021] Furthermore, the drive gear and driven gear are herringbone helical gears. The drive gear is made of 304 stainless steel, and the driven gear is made of polyetheretherketone (PPEK). It can be used normally at a temperature of 160℃. It has the characteristics of self-lubrication, dry friction resistance, corrosion resistance, high strength and long service life, and can meet the dry running requirements when the liquid inlet is empty or when the liquid inlet pipe is replaced with foam liquid.

[0022] See Figure 1 A three-way ball valve is also installed between the pump and the liquid filling outlet. The three-way ball valve includes an inlet for connecting the foam liquid output by the pump, a first outlet for connecting the liquid filling outlet, and a second outlet (return outlet) facing the other direction. The second outlet connects downward to one end of the return liquid pipeline, while the other end of the return liquid pipeline connects to the pump inlet.

[0023] Furthermore, the three-way ball valve controls the switching between the first and second outlets by controlling the rotation of its valve core. The valve core has an internal T-shaped passage, which in turn forms three openings and two passages on the side wall. The three openings include a first end, a second end, and a third end perpendicular to the first and second ends. The two passages include a filling passage connecting the first and second ends, and a return passage connecting the third and first ends. See also Figure 2 When the first and second ends of the T-shaped passage in the valve core are connected to the inlet and first outlet of the three-way ball valve respectively (while the third end points to the upper inner wall of the three-way ball valve), the liquid filling passage is activated, and the foam liquid is delivered to the liquid filling outlet. See also Figure 3When the valve core rotates downwards by 90 degrees, connecting the first and third ends of its through-passage to the inlet and first outlet of the three-way ball valve (while its second end points to the upper inner wall of the three-way ball valve), the return flow path is activated, and the foam liquid is transported to the second outlet and flows downwards into the return pipeline. In use, when foam liquid needs to be supplied to a foam fire truck, the valve core of the three-way ball valve is connected to the filling passage, and the foam liquid is fed into the filling outlet / fire truck via the pump and the three-way ball valve. When it is necessary to switch the foam liquid, the outward output is stopped. The three-way ball valve is switched to the return flow mode via remote control or manual control by rotating it downwards by 90 degrees to activate the return flow path. The valve core connects to the pump outlet, one end of the return pipeline, and the other end of the return pipeline connects to the pump inlet, allowing the foam liquid to flow along the pump outlet - three-way ball valve - return pipeline - pump inlet, i.e., internal circulation between the pump inlet and outlet; at this time, there is no foam liquid output from the filling outlet. Preferably, the engine speed can be synchronously adjusted to a low speed to prevent the water pump from being damaged by high pressure. When it is necessary to restore the foam liquid output, the valve core is switched to the straight-through mode (activating the liquid filling passage) again via remote control or manual, the foam liquid is output again, and the speed control valve is simultaneously controlled to adjust the throttle lever to high speed.

[0024] Further, see Figure 1 For ease of use, this embodiment also includes a control system, including an electrical control box (controller). The electrical components inside the electrical control box can remotely control the operation of the three-way ball valve or the operation of the electric push rod.

[0025] Specifically, the engine driving the pump and the three-way ball valve are communicatively connected to the electrical control box. When the three-way ball valve is switched to the second outlet remotely or manually via the electrical control box, the engine speed is simultaneously reduced by operating the electrical control box, thereby reducing the pump's delivery efficiency. Furthermore, the engine throttle lever is connected to an electric push rod, which is communicatively connected to the electrical control box. The extension and retraction of the electric push rod can control the high and low speed switching of the engine throttle lever.

[0026] This embodiment, by adding a three-way ball valve and a return pipeline, enables internal circulation of foam liquid when it is necessary to temporarily stop the output of foam liquid. It allows switching between the inlet and outlet foam pipelines without shutting down the machine, meeting the liquid supply needs of different foam fire trucks, avoiding the hazards of foam splashing and equipment failure, reducing the workload of operators, and improving fire extinguishing efficiency. Furthermore, it can also reduce the speed of the matching engine to prevent pump damage due to high pressure; simultaneously, the use of new gear materials enables gear self-lubrication, meeting the equipment's dry-running resistance requirements. The implementation of this utility model has been described above with reference to the accompanying drawings and embodiments. The structures given in the embodiments do not constitute a limitation of this utility model. Those skilled in the art can make adjustments as needed, and various modifications or variations within the scope of the appended claims are all within the protection scope.

Claims

1. A foam fluid on-the-fly switching conduit comprising a pump that delivers foam fluid from a foam fluid conduit to a liquid addition outlet, characterized in that: A three-way ball valve is installed between the pump and the liquid filling outlet. The three-way ball valve includes an inlet that connects to the pump, a first outlet that connects to the liquid filling outlet, and a second outlet that connects to one end of the return liquid pipeline. The three-way ball valve controls the switching between the first outlet and the second outlet by rotating its valve core. The other end of the return liquid pipeline is connected to the pump inlet. When the valve core is switched to the second outlet, the foam liquid enters the return liquid line through the three-way pipe, forming an internal circulation backflow between the pump outlet and inlet. At this time, there is no foam liquid output from the liquid addition outlet.

2. The foam fluid on-the-fly switching conduit of claim 1, wherein: The pump is a gear pump, which includes a driving gear and a driven gear that mesh with each other; the driving gear drives the driven gear to rotate and generate pressure, which outputs the foam liquid to the inlet of the three-way ball valve.

3. The foam fluid on-the-fly switching conduit of claim 2, wherein: The driving gear and the driven gear are herringbone helical gears.

4. The foam fluid on-the-fly switching conduit of claim 2, wherein: The driving gear is made of stainless steel, while the driven gear is made of polyetheretherketone (PEEK).

5. The foam fluid on-the-fly switching conduit of any one of claims 1-4, wherein: The engine that drives the pump and the three-way ball valve are connected to the controller. When the three-way ball valve is switched to the second outlet by remote / manual control, the controller synchronously reduces the engine speed, thereby reducing the pump's delivery efficiency.

6. The foam fluid on-the-fly switching conduit of claim 5, wherein: The engine throttle lever is connected to an electric push rod, and the high and low speed switching of the engine throttle lever is controlled by controlling the extension and retraction of the electric push rod.

7. A foam transfer pump characterized by: Includes the foam liquid non-stop switching pipeline as described in any one of claims 1-6.

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