Portable automatic pilot gasoline engine water pump device

Abstract

The application relates to a portable automatic water guiding gasoline engine water pump device, which comprises a water pump body and a water pumping pipe, the water pump body comprises a pump cavity shell, a water pumping impeller and a driving part, a self-water guiding device is arranged in the water pumping pipe, the self-water guiding device comprises a water guiding cylinder, a water guiding element arranged in the water guiding cylinder and a flexible shaft for driving the water guiding element to work, the water guiding element drives water to pass through the water guiding cylinder after rotating, a one-way flow structure is arranged between the circumferential outer wall of the water guiding cylinder and the circumferential inner wall of the water pumping pipe, the one-way flow structure controls water flow to enter the water pumping pipe in one direction, and the end portion of the flexible shaft away from the water guiding element is coaxially connected with the water pumping impeller. The self-water guiding device driven by the impeller is coaxially integrated in the water pumping pipe, the automatic water guiding function without manual pump priming is realized, and the starting convenience and operation efficiency are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of water pump priming technology, and in particular to a portable automatic priming gasoline engine water pump device. Background Technology

[0002] A gasoline engine water pump, also known as a "gasoline engine self-priming pump" or "gasoline water pump," is a water pump device powered by an internal combustion engine. It uses a gasoline engine to drive the pump impeller to pump water. This type of equipment is widely used in the water pump market due to its independence from electricity, mobility, and powerful performance.

[0003] Before starting a water pump, it is usually necessary to "prime" it (also called pump priming). The main reason is to expel the air in the pump chamber and use the liquid to establish an initial "vacuum" or pressure difference, thereby starting the normal pumping process. Priming before starting a water pump is usually done manually, which makes the use of the water pump more troublesome. Summary of the Invention

[0004] To facilitate water priming for the water pump and make it easier to use.

[0005] This application provides a portable automatic priming gasoline engine water pump device, which adopts the following technical solution:

[0006] A portable automatic water pump device for a gasoline engine includes a pump body and a water pipe. The pump body includes a pump housing, a water impeller rotatably disposed within the pump housing, and a drive unit that drives the water impeller to rotate. The pump housing is provided with a water inlet, and the water pipe is connected to the water inlet. The water inlet is coaxially disposed with the rotating shaft of the water impeller.

[0007] The pumping pipe is equipped with a self-priming water device;

[0008] The self-priming water device includes a water-priming cylinder, a water-priming component disposed inside the water-priming cylinder, and a flexible shaft that drives the water-priming component to operate; the water-priming component rotates to drive water through the water-priming cylinder;

[0009] A unidirectional flow structure is provided between the outer circumferential wall of the water inlet cylinder and the inner circumferential wall of the pumping pipe. The unidirectional flow structure controls the water flow to enter the pumping pipe in one direction. The end of the flexible shaft away from the water inlet component is coaxially connected to the pumping impeller.

[0010] By adopting the above technical solution, the impeller, driven by the drive unit, rotates and, through a flexible shaft transmission, drives the water priming component to rotate. Water passes through the priming cylinder and enters the pumping pipe. Due to the unidirectional flow structure, water is not lost. When the water level reaches the pump casing, the pump casing is filled with water, achieving automatic priming. No manual priming of the pump body is required, making the pump easy to use. This application's solution integrates a self-priming device within a coaxial pumping pipe, driven by the impeller through a flexible shaft, achieving the automatic priming function of the pump. This eliminates the traditional manual priming operation, making pump startup more convenient and efficient, especially improving the user experience in outdoor or temporary work scenarios without power or requiring frequent relocation.

[0011] Optionally, the water-guiding component is a spiral conveying rod, the outer circumferential wall of the spiral conveying rod movably contacts the inner wall of the water-guiding cylinder, and the flexible shaft coaxially fixes the spiral conveying rod.

[0012] By adopting the above technical solution, the water intake component is specifically selected as a spiral conveying rod that moves in contact with the inner wall of the water intake cylinder, which has a simple and reliable structure. When the flexible shaft drives the spiral conveying rod to rotate, it can effectively generate axial suction force, continuously conveying water upward into the pump chamber, thereby completing the water intake process quickly and stably. Moreover, this mechanical structure has low requirements for water quality and good adaptability.

[0013] Optionally, the unidirectional flow structure includes an installation ring, a support ring, a unidirectional plate, and a unidirectional elastic element. The inner ring of the installation ring is disposed on the outer wall of the water inlet cylinder, and the outer ring of the installation ring is disposed on the inner wall of the pumping pipe. The installation ring is provided with a unidirectional hole. The support ring is disposed inside the pumping pipe and is located on the side of the installation ring away from the water inlet end of the pumping pipe.

[0014] The one-way plate is slidably disposed between the mounting ring and the support ring, and the one-way elastic element drives the one-way plate to block the one-way hole.

[0015] By adopting the above technical solution, the unidirectional flow structure ensures that water can only enter the pumping pipe in one direction, preventing backflow of water in the pumping pipe and pump chamber during priming or when the pump stops. This helps maintain the vacuum or water seal within the pump chamber, ensuring not only the reliability of priming but also avoiding repeated priming, thus improving the pump's working efficiency and ease of operation. The mounting ring also provides support for the installation of the priming cylinder.

[0016] Optionally, the flexible shaft and the main shaft of the pumping impeller are connected by a connecting structure;

[0017] The connecting structure includes a connecting cylinder, a splined shaft, a reset elastic element, a bearing, and a drive ring plate. The drive ring plate rotates the outer wall of the connecting cylinder coaxially through the bearing, and the connecting cylinder coaxially fixes the flexible shaft. The splined shaft is set on the main shaft of the pumping impeller, and the connecting cylinder has a spline groove that matches the splined shaft. The spline groove has a release groove on the side away from the main shaft of the pumping impeller for the splined shaft to slide into.

[0018] The pump chamber shell includes an inlet shell wall near the water inlet pipe, and the water inlet is located in the middle of the inlet shell wall; the drive ring plate is provided with water passage holes, and the reset elastic element drives the drive ring plate to abut against the inlet shell wall to close all water passage holes.

[0019] By adopting the above technical solution, the connection structure achieves separable transmission linkage between the flexible shaft and the impeller main shaft. When automatic water priming is required, the splined shaft is located in the spline groove, and the drive unit drives the pumping impeller to rotate while simultaneously driving the flexible shaft to rotate. When the water pump enters normal pumping mode, the water pressure drives the ring plate to move, causing the splined shaft to disengage from the spline groove and be located in the disengagement groove, thereby stopping the operation of the self-priming device and avoiding its idling and power loss. This achieves both automatic function switching and optimized energy utilization.

[0020] Optionally, the spline shaft includes a spline portion and a fixed shaft that are coaxially fixed, and the reset elastic element is a reset spring. The reset spring is sleeved on the fixed shaft, and the outer diameter of the fixed shaft is smaller than the outer diameter of the spline portion.

[0021] A stabilizing sleeve is provided on the end face of the connecting sleeve facing the pumping impeller, and the return spring is sleeved on the stabilizing sleeve. The outer diameter of the stabilizing sleeve is larger than the outer diameter of the spline portion.

[0022] By adopting the above technical solution, the outer diameter of the stabilizing cylinder is larger than the outer diameter of the spline section, making it easier for the spline shaft to enter and exit the stabilizing cylinder. The return spring is sleeved outside the stabilizing cylinder, making it less likely to affect the sliding of the spline shaft. This results in smoother and more stable engagement and disengagement of the connection structure, reducing wear and jamming risks. It also enhances the reliability and durability of the automatic clutch function, ensuring the long-term stability of the entire automatic water intake system.

[0023] Optionally, a wire mesh cage is provided at the inlet end of the pumping pipe.

[0024] By adopting the above technical solution, a mesh cage is installed at the inlet end of the pumping pipe to effectively filter large particles, weeds, and other impurities from the water. This prevents foreign objects from entering the self-priming device, impeller, or pump chamber, avoiding blockages, wear, or damage to critical components, thereby protecting the equipment, extending the pump's service life, and reducing maintenance requirements.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The portable automatic priming gasoline engine water pump device provided in this application achieves automatic priming without manual pumping by coaxially integrating a self-priming device driven by an impeller inside the pumping pipe, significantly improving start-up convenience and operating efficiency. Specifically, the spiral conveyor structure ensures stable and efficient water extraction; the unidirectional flow structure prevents backflow and maintains the priming effect; and the special clutch connection structure automatically stops the priming device during normal pumping, optimizing power distribution. Furthermore, the filter cage at the water inlet effectively prevents impurities from entering, protecting the core components of the equipment and enhancing the overall reliability and durability of the device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram showing the overall structure of the portable automatic priming gasoline engine water pump device according to an embodiment.

[0028] Figure 2 This is a partial cross-sectional view of the embodiment, mainly showing the structure inside the pump chamber shell and the water pumping pipe.

[0029] Figure 3 yes Figure 2 Enlarged view of point A.

[0030] Figure 4 yes Figure 2 Enlarged view of point B.

[0031] Figure 5 This is a structural diagram illustrating the support ring, one-way plate, circular plate, and one-way elastic element of the embodiment.

[0032] Explanation of reference numerals in the attached drawings: 1. Pump body; 11. Pump chamber shell; 111. Pump inlet; 112. Outlet; 113. Inlet shell wall; 12. Pump impeller; 13. Drive unit; 2. Pump pipe; 21. Net cage; 3. Self-priming device; 31. Priming cylinder; 32. Priming component; 321. Spiral conveying rod; 33. Flexible shaft; 4. Unidirectional flow structure; 41. Mounting ring; 411. Unidirectional hole; 42. Support ring; 43. Unidirectional plate; 431. Circular plate; 44. Unidirectional elastic component; 5. Connecting structure; 51. Connecting cylinder; 511. Spline groove; 512. Release groove; 52. Spline shaft; 521. Spline part; 522. Fixed shaft; 53. Reset elastic component; 54. Bearing; 55. Drive ring plate; 551. Water passage hole; 6. Stabilizing cylinder. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the accompanying drawings.

[0034] This application discloses a portable automatic priming gasoline engine water pump device. (Refer to...) Figure 1 , Figure 2 , Figure 3The portable automatic gasoline-powered water pump device includes a pump body 1 and a water suction pipe 2. The pump body 1 includes a pump housing 11, a water suction impeller 12 rotatably disposed within the pump housing 11, and a drive unit 13 that drives the water suction impeller 12 to rotate. The drive unit 13 is a gasoline engine, which does not require a power supply and is convenient for outdoor use.

[0035] Reference Figure 1 , Figure 2 , Figure 3 The pump housing 11 is provided with a water inlet 111 and a water outlet 112. The water inlet 111 is connected to the water inlet 111, and the water inlet 111 is coaxially arranged with the shaft of the water impeller 12. A mesh cage 21 is provided at the water inlet end of the water inlet pipe 2 to facilitate the connection of algae, branches and other debris.

[0036] Reference Figure 1 , Figure 2 , Figure 4 A self-priming device 3 is provided at the end of the water pipe 2 away from the water pump body 1. The self-priming device 3 includes a water inlet cylinder 31, a water inlet element 32, and a flexible shaft 33 that drives the water inlet element 32 to work. After the water inlet element 32 rotates, it drives water through the water inlet cylinder 31.

[0037] Reference Figure 1 , Figure 2 , Figure 4 The water inlet cylinder 31 is fixed to the end of the pumping pipe 2 away from the pump body 1. A one-way flow structure 4 is provided between the outer circumferential wall of the water inlet cylinder 31 and the inner circumferential wall of the pumping pipe 2, which controls the water flow to enter the pumping pipe 2 in one direction.

[0038] A flexible shaft 33 is a mechanical transmission device that can bend freely within a certain range and transmit rotational motion and torque from one power source to another. Its core function is to achieve non-linear, angular, or spatially constrained transmission.

[0039] Reference Figures 1-4 The end of the flexible shaft 33 furthest from the water inlet 32 ​​is coaxially connected to the pumping impeller 12. The rotation of the pumping impeller 12 drives the water inlet 32 ​​to rotate. The water inlet 32 ​​is a spiral conveying rod 321, whose outer circumferential wall movably contacts the inner wall of the water inlet cylinder 31. The flexible shaft 33 coaxially fixes the spiral conveying rod 321. After the spiral conveying rod 321 rotates, it conveys water through the water inlet cylinder 31 and into the pumping pipe 2. The unidirectional flow structure 4 prevents water from easily flowing out of the pumping pipe 2.

[0040] Reference Figure 4The unidirectional flow structure 4 includes a mounting ring 41, a support ring 42, a unidirectional plate 43, and a unidirectional elastic element 44. The inner ring of the mounting ring 41 is sealed and fixed to the outer wall of the water inlet cylinder 31, and the outer ring of the mounting ring 41 is sealed and fixed to the inner wall of the pumping pipe 2. The mounting ring 41 has several unidirectional holes 411, which are evenly distributed around the axis of the mounting ring 41. The support ring 42 is located inside the pumping pipe 2, and the inner ring wall of the support ring 42 is fixed to the inner wall of the water inlet cylinder 31, and is located on the side of the mounting ring 41 away from the water inlet end of the pumping pipe 2.

[0041] Reference Figure 4 , Figure 5 The one-way plate 43 includes a circular plate 431 with several one-way holes 411. The one-way plate 43 is slidably disposed between the mounting ring 41 and the support ring 42. The one-way elastic element 44 is a one-way spring, with one end fixed to the one-way plate 43 and the other end fixed to the support ring 42. The one-way elastic element 44 drives the one-way plate 43 to seal all the one-way holes 411. After the water inlet is completed, during normal high-flow pumping, the water flow opens the one-way plate 43, allowing the water to enter the pumping pipe 2.

[0042] Reference Figure 3 The flexible shaft 33 and the main shaft of the pumping impeller 12 are connected by a connecting structure 5. The connecting structure 5 includes a connecting cylinder 51, a splined shaft 52, a reset elastic element 53, a bearing 54, and a drive ring plate 55.

[0043] Reference Figure 3 The drive ring plate 55 rotates coaxially with the outer wall of the connecting cylinder 51 via the bearing 54, and the connecting cylinder 51 is coaxially fixed with the flexible shaft 33. The spline shaft 52 is coaxially fixed with the main shaft of the pumping impeller 12. The spline shaft 52 includes a spline part 521 and a fixed shaft 522 that are coaxially fixed. The fixed shaft 522 is coaxially fixed with the pumping impeller 12, and the spline part 521 is used to connect with the connecting cylinder 51.

[0044] Reference Figure 3 The connecting cylinder 51 has a spline groove 511 that matches the spline part 521. A disengagement groove 512 is provided on the side of the spline groove 511 away from the main shaft of the impeller 12, allowing the spline shaft 52 to slide into it. When the spline part 521 is located within the spline groove 511, the impeller 12 rotates, causing the connecting cylinder 51 to rotate. When the spline part 521 is located within the spline groove 511, the impeller 12 rotates, and the spline part 521 idles within the disengagement groove 512, preventing the flexible shaft 33 from rotating, thereby disengaging the flexible shaft 33 from the impeller 12.

[0045] Reference Figure 3The pump housing 11 includes an inlet housing wall 113 near the pump pipe 2, and a pump inlet 111 is located in the middle of the inlet housing wall 113. A plurality of water passage holes 551 are provided on the drive ring plate 55, and these holes are evenly distributed circumferentially along the axis of the drive ring plate 55. The reset elastic element 53 is a reset spring, which is sleeved on the fixed shaft 522. One end of the reset spring abuts against the end face of the connecting cylinder 51 facing the pump impeller 12, and the other end abuts against the main shaft of the pump impeller 12. By pressing against the connecting cylinder 51, the reset spring drives the drive ring plate 55 to abut against the inlet housing wall 113 to close all the water passage holes 551.

[0046] Reference Figure 3 The outer diameter of the fixed shaft 522 is smaller than the outer diameter of the spline portion 521, making it easier for the spline portion 521 to enter the release groove 512. The end face of the connecting cylinder 51 facing the pumping impeller 12 is integrally formed with a stabilizing cylinder 6. The return spring is sleeved on the outer wall of the stabilizing cylinder 6. The outer diameter of the stabilizing cylinder 6 is larger than the outer diameter of the spline portion 521, so that the elastic force of the return spring is stable.

[0047] The implementation principle of a portable automatic priming gasoline engine water pump device according to an embodiment of this application is as follows: Before starting the water pump, it needs to be primed. The user places the water pipe 2 with a mesh cage 21 into the water source and starts the gasoline engine. The gasoline engine drives the main shaft of the pumping impeller 12 to rotate. At this time, because the spline part 521 and spline groove 511 of the connecting structure 5 are in a meshing state, the power drives the screw conveyor 321 to rotate through the flexible shaft 33. The screw conveyor 321 pumps the water from the lower end of the priming cylinder 31 upwards. Due to the unidirectional flow structure 4, the water does not leak from the bottom of the pumping pipe 2, allowing the water surface to reach the pump chamber shell 11. The water flow slightly pushes open the drive ring plate 55 and the inlet shell wall 113, and the water flows into the pump chamber shell 11 through the water passage 551. Because the water flow rate of the screw conveyor is small, the stroke of the drive ring plate 55 being pushed open is small, and the spline part 521 and spline groove 511 are not completely disengaged, thus allowing the flexible shaft 33 to continue rotating. This process quickly removes air from the pump chamber and pipelines, achieving automatic priming.

[0048] During normal pumping, the pump chamber is filled with water, and the impeller begins to operate normally, generating strong suction pressure, causing a sudden increase in water pressure at the inlet casing wall 113. The high-pressure water pushes the drive ring plate 55 backward against the force of the return spring. This movement has two effects: First, the water passage 551 on the drive ring plate 55 opens, establishing the main water flow channel. Second, the water flow rate in the pumping pipe 2 increases, and the drive ring plate 55 is pushed open with a large stroke. The splined part 521 completely disengages from the spline groove 511 and enters the disengagement groove 512, causing the flexible shaft 33 to disengage from the pumping impeller 12. At this time, the splined shaft 52 disengages from the connecting cylinder 51, and the flexible shaft 33 and the screw conveyor rod 321 stop rotating, automatically stopping the self-priming function.

[0049] When the gasoline engine is turned off and the water pump stops working, the water in the pump chamber and the upper section of the water pipe 2 will try to flow backward under the action of gravity, but it will immediately push the one-way plate 43 back and seal the one-way hole 411. The drive ring plate 55 is pressed tightly against the water inlet shell wall 113 by the water pressure to seal the water passage hole 551, thereby effectively preventing water loss. This ensures that the pump chamber and the water pipe 2 can maintain a "water" state, creating conditions for the next rapid start.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A portable automatic priming gasoline engine water pump device, comprising a water pump body (1) and a water pumping pipe (2), characterized in that: The pump body (1) includes a pump chamber shell (11), a pump impeller (12) rotatably disposed in the pump chamber shell (11), and a drive unit (13) for driving the pump impeller (12) to rotate; the pump chamber shell (11) is provided with a pump inlet (111), the pump pipe (2) is connected to the pump inlet (111), and the pump inlet (111) is coaxially disposed with the rotating shaft of the pump impeller (12); The pumping pipe (2) is equipped with a self-priming water device (3); The self-priming water device (3) includes a water-priming cylinder (31), a water-priming component (32) disposed inside the water-priming cylinder (31), and a flexible shaft (33) that drives the water-priming component (32) to work; the water-priming component (32) drives water through the water-priming cylinder (31) after it rotates; A unidirectional flow structure (4) is provided between the outer circumferential wall of the water inlet cylinder (31) and the inner circumferential wall of the pumping pipe (2). The unidirectional flow structure (4) controls the water flow to enter the pumping pipe (2) in one direction. The end of the flexible shaft (33) away from the water inlet component (32) is coaxially connected to the pumping impeller (12).

2. The portable automatic priming gasoline engine water pump device according to claim 1, characterized in that: The water-guiding component (32) is a spiral conveying rod (321), the outer wall of the spiral conveying rod (321) is in contact with the inner wall of the water-guiding cylinder (31), and the flexible shaft (33) is coaxially fixed to the spiral conveying rod (321).

3. The portable automatic priming gasoline engine water pump device according to claim 1, characterized in that: The unidirectional flow structure (4) includes an installation ring (41), a support ring (42), a unidirectional plate (43), and a unidirectional elastic element (44). The inner ring of the installation ring (41) is disposed on the outer wall of the water inlet cylinder (31), and the outer ring of the installation ring (41) is disposed on the inner wall of the pumping pipe (2). The installation ring (41) is provided with a unidirectional hole (411). The support ring (42) is disposed inside the pumping pipe (2) and is located on the side of the installation ring (41) away from the water inlet end of the pumping pipe (2). The one-way plate (43) is slidably disposed between the mounting ring (41) and the support ring (42), and the one-way elastic element (44) drives the one-way plate (43) to block the one-way hole (411).

4. The portable automatic priming gasoline engine water pump device according to claim 1, characterized in that: The flexible shaft (33) and the main shaft of the pumping impeller (12) are connected by a connecting structure (5); The connecting structure (5) includes a connecting cylinder (51), a spline shaft (52), a reset elastic element (53), a bearing (54), and a drive ring plate (55). The drive ring plate (55) rotates the outer wall of the connecting cylinder (51) coaxially through the bearing (54). The connecting cylinder (51) is coaxially fixed with a flexible shaft (33). The spline shaft (52) is located on the main shaft of the pumping impeller (12). The connecting cylinder (51) has a spline groove (511) that matches the spline shaft (52). The spline groove (511) has a release groove (512) on the side away from the main shaft of the pumping impeller (12) for the spline shaft (52) to slide into. The pump chamber shell (11) includes an inlet shell wall (113) near the side of the pump pipe (2), and the pump inlet (111) is located in the middle of the inlet shell wall (113); the drive ring plate (55) is provided with a water passage hole (551), and the reset elastic member (53) drives the drive ring plate (55) to abut against the inlet shell wall (113) to close all the water passage holes (551).

5. The portable automatic priming gasoline engine water pump device according to claim 4, characterized in that, The spline shaft (52) includes a spline portion (521) and a fixed shaft (522) that are coaxially fixed. The reset elastic element (53) is a reset spring. The reset spring is sleeved on the fixed shaft (522). The outer diameter of the fixed shaft (522) is smaller than the outer diameter of the spline portion (521). The end face of the connecting cylinder (51) facing the pumping impeller (12) is provided with a stabilizing cylinder (6), and the reset spring is sleeved on the stabilizing cylinder (6). The outer diameter of the stabilizing cylinder (6) is larger than the outer diameter of the spline part (521).

6. The portable automatic priming gasoline engine water pump device according to claim 1, characterized in that: A wire mesh cage (21) is provided at the inlet end of the pumping pipe (2).

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