Soft-piston arrangement for a water pump

Abstract

The soft piston device of the water pump comprises a cylinder, a piston assembly arranged in the cylinder, and a water inlet one-way valve and a nozzle arranged at both ends of the cylinder, the piston assembly is located between the water inlet one-way valve and the nozzle, the piston assembly comprises a soft piston, the outer circumferential surface of the soft piston is in sliding fit with the inner wall of the cylinder, a deformation groove is arranged on the upper part of the soft piston, the soft piston can be preferentially elastically deformed at the deformation groove when descending, so that the gap between the soft piston and the inner wall of the cylinder is increased, the water flow resistance is reduced, the water flow amount is increased, and the drainage effect is optimized. Meanwhile, the support frame supports the middle part of the piston body and the position directly below the deformation groove, so that the soft piston is prevented from being excessively deformed when rising, and the sealing performance during water suction is ensured; the limiting seat is arranged away from the deformation groove, so that the soft piston can be guided to be controllably deformed along the groove when descending, the soft piston is prevented from collapsing as a whole, and the reliability of the reciprocating movement of the soft piston is improved.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and specifically to a soft piston device for water pumps. Background Technology

[0002] A manual water pump is a tool that is operated manually to pump or drain water.

[0003] A manual water pump disclosed in utility model patent application number 201720792149.7 includes a mounting cap, a cylinder, a mounting head, a water inlet, a connector, a connecting rod, a handle, a water outlet pipe, a water outlet connector, a water outlet, a piston, and a one-way valve. During operation, pulling the handle moves the piston upwards, opening the one-way valve and allowing water to enter the cylinder through the water inlet. Pressing the handle then moves the piston downwards, closing the one-way valve and allowing water to flow through the gap between the piston and the inner wall of the cylinder. Pulling the handle upwards again then discharges the water through the water outlet pipe. This process is repeated to achieve the pumping and draining action.

[0004] However, since the water flow in this technical solution relies on the gap between the piston and the cylinder for discharge, and in order to ensure that water can be effectively drawn in from the inlet when the piston moves upward, the piston usually has a certain degree of hardness to prevent it from deforming easily. However, this leads to the piston being too hard and deforming too little during the downward movement of the piston, resulting in a small gap between the piston and the inner wall of the cylinder. This can easily lead to high flow resistance and a small drainage volume. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a soft piston device for a water pump.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A flexible piston device for a water pump includes a cylinder, a piston assembly disposed within the cylinder, and inlet check valves and nozzles respectively disposed at both ends of the cylinder. The piston assembly is located between the inlet check valves and the nozzles. The nozzles have an outlet communicating with the interior of the cylinder. A drive rod for driving the piston assembly is slidably fitted on the nozzles. One end of the drive rod extends into the cylinder and connects to the piston assembly. The piston assembly includes a flexible piston. The outer circumferential surface of the flexible piston is slidably fitted with the inner wall of the cylinder. The upper part of the flexible piston has a deformation groove that facilitates elastic deformation of the flexible piston during its downward movement.

[0008] In this invention, the deformation groove is recessed on the upper end surface of the soft piston, and both ends of the deformation groove extend radially along the soft piston without penetrating the side wall of the soft piston.

[0009] In this invention, the soft piston has a piston connection hole in the middle, the drive rod passes through the piston connection hole and is fixedly connected to the soft piston, and there are two deformation grooves symmetrically arranged with the piston connection hole as the center.

[0010] In this invention, the piston assembly further includes a support frame for limiting the downward elastic deformation of the soft piston during its upward movement. The support frame is mounted on the drive rod and supports the bottom of the soft piston. The support frame and the drive rod are fixedly connected by support bolts.

[0011] In this invention, the support frame supports at least the position directly below the deformation groove corresponding to the soft piston.

[0012] In this invention, the piston assembly further includes a limiting seat sleeved on the drive rod and used to press against the top of the soft piston. The limiting seat is disposed away from the deformation groove and is located between the two deformation grooves.

[0013] In this utility model, the drive rod includes a sliding rod and a handle. The nozzle is provided with a sliding insertion hole through which the sliding rod slides. The lower end of the handle is fitted onto the upper end of the sliding rod. A fixing pin is inserted between the sliding rod and the handle to fix them together.

[0014] In this utility model, the limiting seat is fitted onto the lower end of the sliding rod. The support frame is provided with a mating slot for the sliding rod to be inserted and positioned. The bottom surface of the mating slot is provided with a mating through hole from top to bottom. The bottom of the sliding rod presses against the bottom surface of the mating slot. The screw of the support bolt passes through the mating through hole and is threaded into the mating screw hole inside the sliding rod.

[0015] In this utility model, the soft piston is provided with a piston mounting hole, the support frame is provided with a limiting connection hole corresponding to the piston mounting hole, the limiting seat is provided with a limiting connection post protruding, and the lower end of the limiting connection post is inserted into the corresponding piston mounting hole and the limiting connection hole.

[0016] In this invention, a top groove is provided on the outer side of the nozzle.

[0017] The beneficial effects of this utility model are as follows: By providing a deformation groove on the upper part of the flexible piston, the flexible piston can preferentially deform elastically at the deformation groove when descending, thereby increasing the gap between the flexible piston and the inner wall of the cylinder, reducing water flow resistance, increasing water flow rate, and optimizing drainage effect; moreover, the deformation groove does not penetrate the side wall of the piston, allowing the flexible piston to meet both deformation requirements and structural sealing. Simultaneously, support frames and limiting seats are respectively provided at both ends of the flexible piston. The support frames support the middle part of the piston body and directly below the deformation groove, preventing excessive deformation when the flexible piston rises, thus ensuring sealing during water intake; secondly, the limiting seats are positioned to avoid the deformation groove, thereby guiding the piston to deform controllably along the groove when descending, preventing the entire flexible piston from collapsing, and improving the reliability of the reciprocating motion of the flexible piston. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 A three-dimensional view of a soft piston device;

[0020] Figure 2 Schematic diagram of the internal structure of the soft piston device Figure 1 ;

[0021] Figure 3 Schematic diagram of the internal structure of the soft piston device Figure 2 ;

[0022] Figure 4 Schematic diagram of piston assembly installation. Figure 1 ;

[0023] Figure 5 Schematic diagram of piston assembly installation. Figure 2 ;

[0024] Figure 6 This is a 3D view of the inlet check valve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0026] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0027] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0029] Reference Figure 1-6 A flexible piston device for a water pump includes a cylinder 1, a piston assembly disposed within the cylinder 1, and an inlet check valve 2 and a nozzle 3 respectively disposed at both ends of the cylinder 1. The nozzle 3 has an outlet 31 communicating with the interior of the cylinder 1. The piston assembly is located between the inlet check valve 2 and the nozzle 3. A drive rod 4 for driving the piston assembly is slidably fitted on the nozzle 3. One end of the drive rod 4 extends into the cylinder 1 and connects to the piston assembly, thereby driving the piston assembly to reciprocate. The piston assembly includes a flexible piston 5, which is... Made of silicone, the flexible piston 5 slides against the inner wall of the cylinder 1 on its outer periphery. A deformation groove 51 is provided on the upper part of the flexible piston 5 to facilitate elastic deformation during its descent. The deformation groove 51 is recessed on the upper end face of the flexible piston 5. The deformation groove 51 allows the portion of the flexible piston 5 corresponding to the groove to more easily deform elastically during descent, thereby increasing the gap between the flexible piston 5 and the cylinder 1. This increases the amount of water passing between the flexible piston 5 and the inner wall of the cylinder 1, thus enhancing drainage efficiency. Both ends of the deformation groove 51 extend radially along the flexible piston 5 but do not penetrate its sidewalls, ensuring the structural strength and sealing performance of the flexible piston 5.

[0030] In this embodiment, the soft piston 5 has a through piston connection hole 52 in the middle. The drive rod 4 passes through the piston connection hole 52 and is fixedly connected to the soft piston 5, so that when the drive rod 4 reciprocates, it drives the piston assembly to make linear reciprocating motion in the cylinder 1.

[0031] In this embodiment, there are two deformable grooves 51, which are symmetrically arranged with the piston connection hole 52 as the center. This allows the two ends of the flexible piston 5 with the deformable grooves 51 to more easily deform upwards elastically, so that water can flow better to the top of the piston assembly and out of the outlet 31.

[0032] In this embodiment, the piston assembly further includes a support frame 6 for limiting the downward elastic deformation of the soft piston 5 during its upward movement. The support frame 6 is mounted on the drive rod 4 and supports the bottom of the soft piston 5. The support frame 6 and the drive rod 4 are fixedly connected by support bolts 7. When the support frame 6 abuts against the bottom of the soft piston 5, it can effectively prevent excessive deformation of the soft piston 5 during its upward movement, thereby ensuring the sealing and stability of the soft piston 5 during its upward movement. This allows the piston assembly to effectively draw water from the inlet 211 into the cylinder 1 and drive the water inside the cylinder 1 to be discharged from the outlet 31.

[0033] In this embodiment, the support frame 6 supports at least the position directly below the deformation groove 51 corresponding to the soft piston 5, so that the part of the soft piston 5 corresponding to the deformation groove 51 is not easily deformed during the upward movement of the soft piston 5.

[0034] In this embodiment, the piston assembly further includes a limiting seat 8 sleeved on the drive rod 4 and used to press against the top of the soft piston 5. The limiting seat 8 is arranged to avoid the deformation groove 51 and is located between the two deformation grooves 51, so that when the soft piston 5 moves downward, the position of the soft piston 5 corresponding to the deformation groove 51 will preferentially undergo elastic buckling, thereby ensuring the deformation stability of the soft piston 5.

[0035] In this embodiment, the drive rod 4 includes a sliding rod 41 and a handle 42; the lower end of the sliding rod 41 is provided with a mating screw hole that mates with the support bolt 7, and the lower end of the handle 42 is fitted onto the upper end of the sliding rod 41. A fixing pin 43 is inserted between the sliding rod 41 and the handle 42 to fix them together, so that they will not slide relative to each other during use.

[0036] In this embodiment, the nozzle 3 is provided with a sliding insertion hole 32 through which the sliding rod 41 slides. The outer wall of the sliding rod 41 and the inner wall of the sliding insertion hole 32 slide together, so that the nozzle 3 provides a stable guiding effect for the movement of the drive rod 4.

[0037] In this embodiment, the limiting seat 8 is provided with an adaptable through hole 81 for the lower end of the sliding rod 41 to pass through, so that the limiting seat 8 is fitted onto the lower end of the sliding rod 41. The limiting seat 8 and the sliding rod 41 can be fixed together by adhesive. The support frame 6 is provided with a mating slot 61 for the sliding rod 41 to be inserted and positioned. The bottom surface of the mating slot 61 is provided with a mating through hole 62 running from top to bottom. The bottom of the sliding rod 41 presses against the bottom surface of the mating slot 61. The screw of the support bolt 7 passes through the mating through hole 62 and is threaded into the mating screw hole in the sliding rod 41, thereby combining the support frame 6 and the drive rod 4 together.

[0038] In this embodiment, the flexible piston 5 is provided with a piston mounting hole 53, the support frame 6 is provided with a corresponding limiting connection hole 63, and the limiting seat 8 is provided with a protruding limiting connection post 82. The lower end of the limiting connection post 82 is inserted into the corresponding piston mounting hole 53 and the limiting connection hole 63, so that the support frame 6, the limiting seat 8 and the flexible piston 5 are mutually positioned, thereby ensuring the quality of their assembly. Furthermore, there are two piston mounting holes 53, symmetrically arranged on both sides of the piston connection hole 52, and each piston mounting hole 53 corresponds to one limiting connection hole 63 and one limiting connection post 82. In addition, the limiting seat 8 is made of plastic. After the lower end of the limiting connection post 82 is inserted into the corresponding piston mounting hole 53 and the limiting connection hole 63, the lower end of the limiting connection post 82 can be heated and softened, and then the softened part can be shaped using a mold to form a riveting head, thereby better assembling and fixing the limiting seat 8 and the support frame 6 together.

[0039] In this embodiment, the one-way valve 2 includes a suction nozzle 21 and a flexible valve plate 22. The suction nozzle 21 is fixedly connected to the bottom of the cylinder 1, and has a water inlet 211 communicating with the interior of the cylinder 1. The flexible valve plate 22 is made of flexible rubber material and is disposed inside the suction nozzle 21. One end of the flexible valve plate 22 is connected to the suction nozzle 21, and the flexible valve plate 22 covers the water inlet 211 to control the unidirectional flow of water into the interior of the cylinder 1. Specifically, the suction nozzle 21 has a connecting protrusion 213, and the flexible valve plate 22 has a valve plate connecting hole through which the connecting protrusion 213 passes. A retaining ring 23 is fitted on the connecting protrusion 213 to press the flexible valve plate 22 onto the suction nozzle 21. The connecting protrusion 213 can be used to fix the retaining ring 23 onto the suction nozzle 21 by forming a riveting head.

[0040] When the piston assembly moves upward, the flexible valve plate 22 opens, allowing external liquid to enter the cylinder 1 through the inlet 211. When the piston assembly moves downward, the flexible valve plate 22, under pressure, tightly adheres to the inlet 211 to achieve a seal, preventing liquid backflow. At the same time, due to the increased pressure, the flexible piston 5, due to the elastic deformation of the deformation groove 51, increases the gap between it and the inner wall of the cylinder 1, making it easier for liquid to be discharged from between the flexible piston 5 and the inner wall of the cylinder 1 and flow to the outlet 31, thereby improving drainage efficiency.

[0041] In this embodiment, the suction nozzle 21 is provided with a lower slot 212, and the lower end of the cylinder 1 is inserted and fixed in the lower slot 212. The outer wall of the cylinder 1 and the groove wall of the lower slot 212 can be connected by a threaded connection, or by adhesive bonding. Alternatively, the outer wall of the cylinder 1 and the groove wall of the lower slot 212 can be first connected by a threaded connection and then reinforced by adhesive bonding. As long as the combination connection between them can be achieved, it is acceptable.

[0042] In this embodiment, the nozzle 3 is provided with an upper slot 33, and the upper end of the cylinder 1 is inserted and fixed in the upper slot 33. The outer wall of the cylinder 1 and the groove wall of the upper slot 33 can be connected by a threaded connection, or they can be connected by adhesive bonding. Alternatively, the outer wall of the cylinder 1 and the groove wall of the upper slot 33 can be first connected by a threaded connection and then reinforced by adhesive bonding. As long as they can be connected in combination, it is acceptable.

[0043] In this embodiment, a top groove 34 is provided on the outer side of the nozzle 3. The top groove 34 can cooperate with an external connector to fix the water pump in place. For example, when the water pump in this embodiment is used on a kayak, the connector is a rope. One end of the rope is wrapped around the top groove 34 and then tied in a knot to fix it. The rope is mutually constrained and positioned by cooperating with the top groove 34. Then the other end of the rope is tied to the kayak, which can prevent the water pump from falling into the water from the kayak during use due to water flow impact or operation shaking and thus not being able to be quickly retrieved.

[0044] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A flexible piston device for a water pump, comprising a cylinder (1), a piston assembly disposed within the cylinder (1), and an inlet check valve (2) and a nozzle (3) respectively disposed at both ends of the cylinder (1), wherein the piston assembly is located between the inlet check valve (2) and the nozzle (3), the nozzle (3) is provided with an outlet (31) communicating with the interior of the cylinder (1), and a drive rod (4) for driving the piston assembly is slidably fitted on the nozzle (3), one end of the drive rod (4) extending into the cylinder (1) and connected to the piston assembly; characterized in that: The piston assembly includes a soft piston (5), the outer peripheral surface of which slides in contact with the inner wall of the cylinder (1), and the upper part of the soft piston (5) is provided with a deformation groove (51) that facilitates the elastic deformation of the soft piston (5) during its downward movement.

2. The flexible piston device for a water pump according to claim 1, characterized in that: The deformation groove (51) is recessed on the upper end surface of the soft piston (5). Both ends of the deformation groove (51) extend radially along the soft piston (5) and do not penetrate the side wall of the soft piston (5).

3. The flexible piston device for a water pump according to claim 1, characterized in that: The soft piston (5) has a piston connection hole (52) in the middle. The drive rod (4) passes through the piston connection hole (52) and is fixedly connected to the soft piston (5). There are two deformation grooves (51) and they are symmetrically arranged with the piston connection hole (52) as the center.

4. The flexible piston device of the water pump according to any one of claims 1-3, characterized in that: The piston assembly also includes a support frame (6) for limiting the downward elastic deformation of the soft piston (5) during upward movement. The support frame (6) is mounted on the drive rod (4) and supports the bottom of the soft piston (5). The support frame (6) and the drive rod (4) are fixedly connected by support bolts (7).

5. The flexible piston device for a water pump according to claim 4, characterized in that: The support frame (6) supports at least the position directly below the deformable groove (51) corresponding to the soft piston (5).

6. The flexible piston device for a water pump according to claim 4, characterized in that: The piston assembly also includes a limiting seat (8) sleeved on the drive rod (4) and used to press against the top of the soft piston (5). The limiting seat (8) is arranged to avoid the deformation groove (51) and is located between the two deformation grooves (51).

7. The flexible piston device for a water pump according to claim 4, characterized in that: The drive rod (4) includes a sliding rod (41) and a handle (42). The nozzle (3) is provided with a sliding insertion hole (32) through which the sliding rod (41) slides. The lower end of the handle (42) is fitted onto the upper end of the sliding rod (41). A fixing pin (43) is inserted between the sliding rod (41) and the handle (42) to fix them together.

8. The flexible piston device for a water pump according to claim 7, characterized in that: The limiting seat (8) is fitted onto the lower end of the sliding rod (41). The support frame (6) is provided with a mating slot (61) for the sliding rod (41) to be inserted and positioned. The bottom surface of the mating slot (61) is provided with a mating through hole (62) running from top to bottom. The bottom of the sliding rod (41) presses against the bottom surface of the mating slot (61). The screw of the support bolt (7) passes through the mating through hole (62) and is threaded into the mating screw hole in the sliding rod (41).

9. The flexible piston device for a water pump according to claim 6, characterized in that: The soft piston (5) is provided with a piston mounting hole (53), the support frame (6) is provided with a limiting connection hole (63) corresponding to the piston mounting hole (53), the limiting seat (8) is provided with a limiting connection post (82) protruding, and the lower end of the limiting connection post (82) is inserted into and cooperates with the corresponding piston mounting hole (53) and the limiting connection hole (63).

10. The flexible piston device of the water pump according to claim 1, characterized in that: The nozzle (3) has a top groove (34) on its outer side.

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