Four-stage fire pump powered by two-stroke gasoline engine

Abstract

The utility model discloses a four -stage fire pump of two -stroke gasoline engine power, it belongs to forest fire equipment field, and it solves the problem of existing technique equipment is heavy, and the poor convenience, and the start troublesome problem, and simultaneously its centrifugal pump adopts four -stage supercharging structure, and can effectively improve the delivery pressure. It mainly includes frame, be equipped with engine assembly and pump body assembly on the frame, be equipped with quick -detach structure between engine assembly and pump body assembly, engine assembly include engine and electric starting module, pump body assembly include centrifugal pump pump body, be equipped with pump cover on centrifugal pump pump body, be equipped with four cavity structure in centrifugal pump pump body, cavity structure inside be equipped with runner assembly and static wheel subassembly. The utility model discloses two -stroke gasoline engine and four -stage centrifugal pump are used in match, have compact structure, the characteristics of big power, after combining with four -stage pump body assembly, the whole machine is light in weight, and the jet flow is big, and the lift is high.

Description

Technical Field

[0001] This utility model relates to the field of gasoline engine technology, and more specifically, to a four-stage fire pump powered by a two-stroke gasoline engine. Background Technology

[0002] Existing four-stage centrifugal pumps are mostly driven by large-displacement four-stroke gasoline engines, which are bulky, heavy, and expensive, making them impossible for a single person to handle; for example, the four-stroke engine disclosed in application CN203594480U. For small mechanical equipment requiring liquid transfer, garden and forest firefighting tools, combining a two-stroke gasoline engine with the pump body has certain advantages. However, the traditional combination of a two-stroke gasoline engine and pump body may have some shortcomings, such as inflexible connection structure, making installation and maintenance difficult. Currently, there is a lack of a small, low-cost, lightweight, high-lift, four-stage booster centrifugal fire pump that can be handled by a single person. Utility Model Content

[0003] The purpose of this invention is to provide a four-stage fire pump powered by a two-stroke gasoline engine, in order to solve the problems of heavy equipment, poor convenience, and troublesome start-up in the existing technology, while increasing the pump head.

[0004] This utility model is achieved through the following technical solution: A four-stage fire pump powered by a two-stroke gasoline engine includes a frame on which an engine assembly and a pump body assembly are mounted, with a quick-release structure between the engine assembly and the pump body assembly. The engine assembly includes an engine and an electric start module. The pump body assembly includes a centrifugal pump body with a pump cover, and the centrifugal pump body has four chamber structures. A drive wheel assembly is located inside each chamber structure.

[0005] Furthermore, the centrifugal pump body is fixed to a pump shaft by a nut, and the pump shaft is sequentially provided with a splined shaft, a rolling bearing, a sealing structure, and a cavity structure.

[0006] Furthermore, the cavity structure includes a guide wheel and a stationary wheel assembly; the moving wheel assembly includes moving wheel I, moving wheel II, moving wheel III, and moving wheel IV; the stationary wheel assembly includes a flat stationary wheel, a concave stationary wheel I, and a concave stationary wheel II; moving wheel I is provided between the guide wheel and the flat stationary wheel; moving wheel II is provided between the flat stationary wheel and the concave stationary wheel I; moving wheel III is provided between the concave stationary wheel I and the concave stationary wheel II; and moving wheel IV is provided between the concave stationary wheel II and the pump cover.

[0007] Furthermore, the concave stationary wheel I and the concave stationary wheel II have groove structures on both end faces; the planar stationary wheel has a groove structure on one end face.

[0008] Furthermore, sealing rings are provided on the outer sides of the planar stationary wheel, concave stationary wheel I, and concave stationary wheel II.

[0009] Furthermore, keyways are provided on all three drive wheels: I, II, III, and IV; a flat key is provided on the pump shaft; the flat key and the keyway are matched and positioned for positioning.

[0010] Furthermore, the inner wall of the centrifugal pump body is a smooth cylindrical inner wall.

[0011] Furthermore, the electric start module includes a starter motor fixed to the engine; the starter motor is equipped with a start button; the starter motor is connected to a relay, which is connected to an external power source; the output shaft of the starter motor is equipped with a gear, which meshes with a rotor gear, and the rotor gear is connected to the engine.

[0012] Furthermore, the quick-release structure includes two buckles with grooves on their inner sides. The bottom ends of the two buckles are hinged together, and the top ends of the two buckles are connected by an opening and closing structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention utilizes a two-stroke gasoline engine paired with a four-stage centrifugal pump, featuring a compact structure and high power. When combined with the four-stage pump assembly, the entire unit is lightweight, with a large injection flow rate and high head. This invention employs a quick-disassembly structure, allowing for disassembly of the four-stage pump without tools. This invention also utilizes an electric start module, replacing the traditional manual start method of a two-stroke gasoline engine through a linkage logic of the start button. Starting is achieved simply by pressing the button, eliminating the need for strenuous operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the electric starter module structure of this utility model; Figure 3 This is an exploded view of the pump body assembly of this utility model; Figure 4 This is a sectional view of the pump body assembly of this utility model; Figure 5 This is a schematic diagram of the quick-release structure of this utility model.

[0015] In the diagram: 1. Splined shaft; 2. Bearing retaining ring; 3. Rolling bearing; 4. Sealing structure; 5. Centrifugal pump body; 6. Guide wheel; 7. Driving wheel assembly; 8. Flat stationary wheel; 9. Concave stationary wheel I; 10. Sealing ring; 11. Concave stationary wheel II; 12. Flat key; 13. Fastening screw; 14. Pump shaft; 15. Pump cover; 16. Nut; 17. Frame; 18. Engine assembly; 19. Pump body assembly; 20. Quick-release structure; 21. External power interface; 22. Start button; 23. Relay; 24. Starter motor; 25. Rotor gear; 26. Snap-fit; 27. Opening and closing structure; 28. Groove. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, the directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the creation of this utility model.

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Example 1: A four-stage fire pump powered by a two-stroke gasoline engine, such as... Figures 1-5 As shown, the system includes a frame 17, on which an engine assembly 18 and a pump body assembly 19 are mounted. A quick-release structure 20 is provided between the engine assembly 18 and the pump body assembly 19. The engine assembly 18 includes an engine and an electric start module. The pump body assembly 19 includes a centrifugal pump body 5, which is fixed by fastening screws 13. A pump cover 15 is provided on the centrifugal pump body 5. The centrifugal pump body 5 has four cavity structures inside. A drive wheel assembly 7 is provided inside each cavity structure.

[0019] This four-stage fire pump, powered by a two-stroke gasoline engine, has achieved significant advantages in four core dimensions—power adaptability, pump performance, ease of operation, and maintenance efficiency—through structural optimization.

[0020] Example 2: A four-stage fire pump powered by a two-stroke gasoline engine, such as... Figure 3 and Figure 4As shown, the centrifugal pump body 5 is fixed to the pump shaft 14 by a nut 16. The pump shaft 14 is sequentially provided with a splined shaft 1, a rolling bearing 3, a sealing structure 4, and a cavity structure. A bearing retaining ring 2 is provided between the rolling bearing 3 and the centrifugal pump body. The cavity structure includes a guide wheel 6 and a stationary wheel assembly; the moving wheel assembly 7 includes moving wheel I, moving wheel II, moving wheel III, and moving wheel IV; the stationary wheel assembly includes a flat stationary wheel 8, a concave stationary wheel I 9, and a concave stationary wheel II 11; the guide wheel 6 and the flat stationary wheel 8 are provided with moving wheel I, forming a fourth cavity; the flat stationary wheel 8 and the concave stationary wheel I 9 are provided with moving wheel II, forming a third cavity; the concave stationary wheel I 9 and the concave stationary wheel II 11 are provided with moving wheel III, forming a second cavity; the concave stationary wheel II 11 and the pump cover 15 are provided with moving wheel IV, forming a first cavity. The concave stationary wheel I9 and the concave stationary wheel II11 have groove 28 structures on both end faces, and the planar stationary wheel 8 has a groove 28 structure on one end face. After multiple stationary wheels are axially installed, an annular groove can be formed on the inner side.

[0021] The four-chamber structure inside the pump body, combined with the combination of moving impeller I, moving impeller II, moving impeller III and moving impeller IV with flat stationary impeller 8, concave stationary impeller I9 and concave stationary impeller II11, can achieve four-stage pressurization of liquid. This structure can effectively reduce liquid flow resistance and achieve step-by-step pressurization, increase the liquid delivery pressure and flow rate per unit time, and meet the requirements of high-lift operation.

[0022] The planar stationary wheel 8, the concave stationary wheel I 9, and the concave stationary wheel II 11 are provided with sealing rings 10 on their outer sides, which can form a sealing cavity with the inner wall of the pump body.

[0023] The drive wheels I, II, III and IV are all provided with keyways; the pump shaft 14 is provided with a flat key 12; the flat key 12 is matched with the keyway for positioning.

[0024] The inner wall of the centrifugal pump body 5 is a smooth cylindrical inner wall without grooves, which can effectively reduce the weight of the pump body and facilitate casting, machining and maintenance.

[0025] The electric start module includes a starter motor 24, which is fixed to the engine. The starter motor 24 has a start button 22 and an external power interface 21. A relay 23 is connected to the starter motor 24 and is connected to an external power source. A gear is mounted on the output shaft of the starter motor 24, meshing with a rotor gear 25, which is mounted on a rotor. The rotor is mounted on one side of the engine's crankshaft. The electric start module replaces the traditional hand-operated start method of two-stroke gasoline engines. Users can start the engine simply by pressing a button, eliminating the need for strenuous operation, making it particularly suitable for high-frequency starting scenarios.

[0026] The quick-release structure 20 includes two clips 26, such as Figure 5As shown, the inner side of the buckle 26 has a groove 28, the bottom ends of the two buckles 26 are hinged together, and the top ends of the two buckles 26 are connected by an opening and closing structure 27. The opening and closing structure 27 includes a lever, a connecting piece, and a tension knob; one end of the connecting piece is connected to the lever, and the other end is connected to the tension knob; the lever has a limiting block, and the lever is connected to the connecting piece through the limiting block. The limiting block has a rotating shaft hole, and an eccentric shaft is provided in the rotating shaft hole. The eccentric shaft is set on one of the buckles 26, and the other buckle 26 has a limiting platform, which cooperates with the tension knob. It can quickly separate the two parts without the need for complicated tools. When the pump body or engine malfunctions, it can be disassembled and repaired separately, avoiding the time cost of disassembling the whole unit. It is the same as in Embodiment 1.

[0027] In use, after connecting a 12V DC power supply to the power interface, pressing the start button 22 activates the relay 23. The current from the power supply is then transmitted to the starter motor 24 via the relay 23. The gear at the output end of the starter motor 24 meshes with the rotor gear 25, driving the rotor to rotate and thus starting the engine. After the engine is running stably, its output power is transmitted to the pump shaft 14 of the pump body assembly 19 through a transmission structure (not explicitly mentioned, but usually a coupling or pulley), driving the pump shaft 14 to rotate at high speed. The liquid first enters the cavity between the guide wheel 6 and the flat stationary wheel 8. The four-chamber moving wheel assembly 7 is connected in series by the pump shaft 14 and rotates synchronously. Under the action of power, the impeller of the moving wheel rotates, and the water flows into the first water chamber through the inlet direction, and then enters the second, third, and fourth chambers step by step, with each stage increasing the pressure. The high-pressure liquid after four stages of pressurization is discharged through the outlet channel of the centrifugal pump body 5 and delivered to the target scene, completing one complete liquid transportation cycle.

[0028] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A four-stage fire pump powered by a two-stroke gasoline engine, comprising a frame (17), characterized in that: The frame (17) is provided with an engine assembly (18) and a pump body assembly (19). A quick-release structure (20) is provided between the engine assembly (18) and the pump body assembly (19). The quick-release structure (20) includes two buckles (26). The buckles (26) have grooves (28) on their inner sides. The bottom ends of the two buckles (26) are hinged together, and the top ends of the two buckles (26) are connected by an opening and closing structure (27). The engine assembly (18) includes an engine and an electric start module. The pump body assembly (19) includes a centrifugal pump body (5). The centrifugal pump body (5) is provided with a pump cover (15). The centrifugal pump body (5) has four cavity structures. The cavity structures are provided with a drive wheel assembly (7).

2. The four-stage fire pump powered by a two-stroke gasoline engine according to claim 1, characterized in that: The centrifugal pump body (5) is fixed with a pump shaft (14) by a nut (16). The pump shaft (14) is provided with a spline shaft (1), a rolling bearing (3), a sealing structure (4) and a cavity structure in sequence.

3. The four-stage fire pump powered by a two-stroke gasoline engine according to claim 2, characterized in that: The cavity structure includes a guide wheel (6) and a stationary wheel assembly; the moving wheel assembly (7) includes moving wheel I, moving wheel II, moving wheel III and moving wheel IV; the stationary wheel assembly includes a flat stationary wheel (8), a concave stationary wheel I (9) and a concave stationary wheel II (11); the guide wheel (6) and the flat stationary wheel (8) are provided with moving wheel I; the flat stationary wheel (8) and the concave stationary wheel I (9) are provided with moving wheel II; the concave stationary wheel I (9) and the concave stationary wheel II (11) are provided with moving wheel III; the concave stationary wheel II (11) and the pump cover (15) are provided with moving wheel IV.

4. The four-stage fire pump powered by a two-stroke gasoline engine according to claim 3, characterized in that: The concave stationary wheel I (9) and the concave stationary wheel II (11) have groove structures on both ends; the planar stationary wheel (8) has a groove structure on one end.

5. The four-stage fire pump powered by a two-stroke gasoline engine according to claim 3, characterized in that: The planar stationary wheel (8), concave stationary wheel I (9) and concave stationary wheel II (11) are provided with sealing rings (10) on their outer sides.

6. The four-stage fire pump powered by a two-stroke gasoline engine according to claim 3, characterized in that: The drive wheel I, drive wheel II, drive wheel III and drive wheel IV are all provided with keyways; the pump shaft (14) is provided with a flat key (12); the flat key (12) is matched with the keyway for positioning.

7. The four-stage fire pump powered by a two-stroke gasoline engine according to claim 2, characterized in that: The inner wall of the centrifugal pump body (5) is a smooth cylindrical inner wall.

8. The four-stage fire pump powered by a two-stroke gasoline engine according to claim 1, characterized in that: The electric start module includes a starter motor (24) which is fixed on the engine; the starter motor (24) is provided with a start button (22); the starter motor (24) is connected to a relay (23) which is connected to an external power source; the output shaft of the starter motor (24) is provided with a gear, which meshes with a rotor gear (25) which is connected to the engine.

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