Miniature water pump with upper and lower laminated pistons

Abstract

The utility model discloses a miniature water pump with pistons stacked up and down, which comprises a first shell, a second shell, a valve plate, a valve cover, a tower-shaped piston piece, a piston frame, a motor arranged at the bottom of the first shell, a driving block and a steel needle shaft arranged between the driving block and the piston frame and used for transmission. At least three inserting holes are formed in the valve plate, a plurality of water inlet holes are formed in the periphery of each inserting hole, and an umbrella pin used for opening or closing the corresponding water inlet hole is inserted into each inserting hole. According to the utility model, the tower-shaped piston piece, the second shell and the valve plate respectively form a double-layer cavity design of a laminated structure, so that the separation of a water inlet laminated layer and a water outlet laminated layer is realized in a limited space, the noise generated in the working process is effectively reduced, the standard of high quality and high stability is met, the structure is simple, and the maintenance is easy.

Description

Technical field:

[0001] The utility model relates to the technical field of micro air pumps, in particular to a micro water pump with upper and lower laminated pistons. Background technology:

[0002] Diaphragm water pumps are oil-free, dry-running pumps that are widely used in areas requiring pure conveying media, such as laboratories, pharmaceuticals, food processing, chemicals, and the electronics industry. Their main feature is that they push the fluid through the deformation of the diaphragm rather than directly contacting the fluid, thus avoiding contamination of the fluid or the inside of the pump body. The main components of a diaphragm pump include the pump body, diaphragm, inlet and outlet valves, etc. The pump body consists of interconnected chambers, each separated by a diaphragm. The diaphragm can be made of materials such as rubber and fluororubber. The inlet and outlet valve bodies have one-way valves to ensure one-way in and out of the liquid. However, the existing liquid pumps have a complex structure and make a lot of noise during operation. They cannot be used in devices with high requirements for noise and stability, and the maintenance cost is high.

[0003] Currently, there is a relatively common micro water pump on the market. For example, Chinese utility model patent application with patent publication number CN206092363U discloses a micro water pump with a motor revolution count output. The micro water pump comprises: a pump body, a motor, and a revolution counting device. The motor is mounted outside the pump body, and the front and rear ends of the motor respectively have a front motor shaft and a rear motor shaft that rotate synchronously. The front motor shaft extends into the pump body as the drive shaft of the micro water pump, and the rear motor shaft is placed outside the pump body as a counting shaft. The revolution counting device is mounted on the rear motor shaft for counting and outputting the revolutions of the rear motor shaft. This utility model can output the revolutions of the micro water pump motor, thereby facilitating precise control of the micro water pump flow rate. It has a wide range of applications and is easy to maintain and install.

[0004] However, this existing micro water pump still has the following disadvantages:

[0005] This technical solution incorporates a revolution counter at the rear motor shaft, which counts and outputs the number of revolutions of the rear motor shaft, achieving a process where the motor's revolutions can be counted and output. However, the overall structure of this liquid pump remains common among existing diaphragm pumps, generating considerable internal noise during operation. This makes it unsuitable for use in devices requiring high noise and stability requirements, and also results in high maintenance costs.

[0006] In view of this, the inventors propose the following technical solutions. Utility model content:

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a micro water pump with upper and lower laminated pistons.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions: a micro water pump with upper and lower laminated pistons, comprising: a first shell, a second shell, a valve plate, a valve cover, a tower-shaped piston piece mounted on the second shell from top to bottom and extending into the first shell, a piston rack arranged in the first shell and used to push the tower-shaped piston piece to work, a motor arranged at the bottom of the first shell, a drive block arranged on the motor output shaft and located in the first shell, and a steel needle shaft arranged between the drive block and the piston rack and used for transmission, a water inlet valve port and a water outlet valve port are provided on the valve cover, at least three jacks are provided on the valve plate, a number of water inlet holes are provided around each of the jacks, and an umbrella ding for opening or closing the water inlet hole is inserted in each of the jacks.

[0009] Furthermore, in the above technical solution, the driving block is provided with an inclined hole for docking with the steel needle shaft, and the bottom of the inclined hole is integrally provided with a hemisphere for contacting the steel needle shaft.

[0010] Furthermore, in the above technical solution, the umbrella shank includes an insertion end for inserting into the socket, an umbrella edge integrally formed with the insertion end and capable of covering the water inlet hole, and a convex portion formed at the insertion end and interference-fitted into the socket, wherein the size of the convex portion is larger than the inner diameter of the socket.

[0011] Furthermore, in the above technical solution, the valve cover is installed on the valve plate, and a water inlet groove for communicating with the water inlet valve port is provided on the valve plate; at least three air bag cavities for alternating compression are provided on the tower-shaped piston plate, and correspondingly, at least three piston columns are provided on the piston rack, which are respectively interference fit and inserted into the first mounting hole at the bottom of the air bag cavity.

[0012] Furthermore, in the above technical solution, a water outlet collecting groove is provided between the bottom of the tower-shaped piston plate and the second shell, and at least three crescent-shaped water outlet valve plates opening downward and connected to the water outlet collecting groove are provided on the tower-shaped piston plate, and at least three drainage structures are provided at the bottom of the valve plate, which are respectively used to connect the airbag cavity and the crescent-shaped water outlet valve plate.

[0013] Furthermore, in the above technical solution, the drainage structure includes a first convex ring formed at the bottom of the valve plate and extending into the airbag cavity in an interference fit manner, a first protrusion block formed at the bottom of the valve plate and pressed against the crescent-shaped water outlet valve plate, and a first strip-shaped groove hole formed at the bottom of the valve plate and extending into the first convex ring and the first protrusion block; the water outlet collecting groove is located between the three airbag cavities, and a first drainage hole is provided in the center of the water outlet collecting groove, which is connected to the water outlet valve port and is used to drain water outward.

[0014] Furthermore, in the above technical solution, the bottom of the piston frame is protrudingly formed with a first sleeve portion that is sleeved on the steel needle shaft, and the inclined hole is eccentrically located on one side of the driving block.

[0015] Furthermore, in the above technical solution, the lower end of the valve plate is provided with at least three elastic snap arms extending downward and used to match and snap with the first shell, the outer wall of the first shell is provided with at least three positioning blocks for matching and snapping with the elastic snap arms, and the outer wall of the second shell is provided with at least three first positioning grooves for the elastic snap arms to pass through for positioning; the first positioning groove protrudes upward from the upper end face of the second shell, and the outer wall of the tower-shaped piston plate is provided with at least three second positioning grooves corresponding to the first positioning grooves.

[0016] Furthermore, in the above technical solution, a reinforcing rib is provided on the inner side of the elastic snap arm, wherein a first locking groove corresponding to the reinforcing rib is provided in the first positioning groove, and a first notch for the reinforcing rib to pass through is provided in the middle of the locking block; at least three third positioning grooves for accommodating the locking block and for the elastic snap arm to be inserted into the locking position are provided on the outer wall of the first shell, and a first gear bar for limiting the elastic snap arm is provided in the third positioning groove.

[0017] Furthermore, in the above technical solution, the motor is fixed to the bottom of the first shell by screws, and a first positioning column protruding from the upper end surface and inserted into the second shell for positioning is provided on the inner wall of the first shell, and a fourth positioning groove for the first positioning column to be inserted for positioning is provided on the second shell.

[0018] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: in the present invention, by opening a plurality of water inlet holes on the valve plate, an umbrella is inserted into the valve plate so that the umbrella can slide up and down to open or close the water inlet holes, thereby forming a one-way valve between the water inlet groove and the airbag cavity, and the tower-shaped piston plate is provided with a crescent-shaped water outlet valve plate, and the tower-shaped piston plate forms a double-layer cavity design with a laminated structure with the second shell and the valve plate, thereby realizing the separation of the water inlet laminate and the water outlet laminate in a limited space, effectively reducing the noise generated internally during operation, meeting the standards of high quality and high stability, and can be applied to devices with high requirements, and has a simple structure and is easy to maintain. Description of the drawings:

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the exploded structure of the utility model from another perspective;

[0022] Figure 4 It is a cross-sectional schematic diagram of the present utility model;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the mid-tower type piston piece of the utility model;

[0024] Figure 6 It is a cross-sectional schematic diagram of the driving block in the utility model;

[0025] Figure 7 It is a schematic diagram of the assembly of the valve plate and the umbrella shank in the utility model. Specific implementation method:

[0026] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0027] See Figures 1 to 7 As shown, a micro water pump with an upper and lower laminated piston is provided, which includes: a first housing 1, a second housing 2, a valve plate 3, a valve cover 4, a tower-shaped piston piece 5 mounted on the second housing 2 from top to bottom and extending into the first housing 1, a piston rack 6 arranged in the first housing 1 and used to push the tower-shaped piston piece 5 to work, a motor 7 arranged at the bottom of the first housing 1, a drive block 8 arranged on the output shaft of the motor 7 and located in the first housing 1, and a steel needle shaft 9 arranged between the drive block 8 and the piston rack 6 and used for transmission, a water inlet valve port 41 and a water outlet valve port 42 are provided on the valve cover 4, and at least three jacks 31 are provided on the valve plate 3, each of the jacks 31 is surrounded by a plurality of water inlet holes 32, and each of the jacks 31 is inserted with an umbrella 10 for opening or closing the water inlet hole 32. Here, a plurality of water inlet holes 32 are formed in the valve plate 3, and umbrellas 10 are inserted into the valve plate 3. The umbrellas 10 can slide up and down to open or close the water inlet holes 32. In this way, a one-way valve is formed between the valve plate 3 and the tower-shaped piston plate 5. External liquid entering through the water inlet valve port 41 can only flow in one direction from the water inlet groove 34 of the valve plate 3 to the airbag cavity 51 of the tower-shaped piston plate 5.

[0028] Combine Figure 6 As shown, the driving block 8 is provided with an inclined hole 81 for docking with the steel needle shaft 9, and the bottom of the inclined hole 81 is integrally provided with a hemisphere 82 for contacting the steel needle shaft 9. Here, the existing structure usually adopts a method of providing a steel ball in the inclined hole 81 to contact the steel needle shaft 9, but when the driving block 8 rotates rapidly, the steel ball will rub against the inner wall of the inclined hole 81 and the end of the steel needle shaft 9, which not only has a large friction force, but also generates a large noise, and the effect is not good. Compared with the existing structure, in the utility model, a hemisphere 82 is integrally protruded from the inclined hole 81 to form a low rolling resistance structure with the steel needle shaft 9, which not only reduces one component, but also greatly reduces the friction force and avoids the noise caused by friction.

[0029] Combine Figure 7 As shown, the shank 10 includes an insertion end 110 for insertion into the insertion hole 31, a rim 120 integrally formed with the insertion end 110 and capable of covering the water inlet hole 32, and a protrusion 130 formed on the insertion end 110 and inserted into the insertion hole 31 with an interference fit. The protrusion 130 is larger than the inner diameter of the insertion hole 31. The protrusion 130 serves to axially limit the shank 10, allowing it to slide up and down along the insertion hole 31 while preventing it from falling out of the insertion hole 31. When the shank 10 slides upward until the rim 120 covers the water inlet hole 32, the water inlet groove 34 and the airbag cavity 51 are closed. When the shank 10 slides downward until the rim 120 leaves the water inlet hole 32, the water inlet groove 34 and the airbag cavity 51 are connected.

[0030] The valve cover 4 is mounted on the valve plate 3, which is provided with a water inlet groove 34 for communicating with the water inlet valve port 41. The tower-shaped piston plate 5 is provided with at least three airbag cavities 51 for alternating compression. Correspondingly, the piston holder 6 is provided with at least three piston posts 61, which are interference-fitted into first mounting holes 52 at the bottoms of the airbag cavities 51. Here, the tower-shaped piston plate 5 is provided with a crescent-shaped water outlet valve plate 54. The tower-shaped piston plate 5, the second housing 2, and the valve plate 3 form a double-layered cavity design, separating the water inlet and outlet cavities within a limited space and significantly reducing internal operating noise.

[0031] A water outlet collection groove 53 is provided between the bottom of the tower-shaped piston plate 5 and the second housing 2. The tower-shaped piston plate 5 is provided with at least three downwardly opening crescent-shaped water outlet valve discs 54 that communicate with the water outlet collection groove 53. The bottom of the valve plate 3 is provided with at least three drainage structures 33 that respectively connect the airbag cavity 51 with the crescent-shaped water outlet valve discs 54. The drainage structures 33 include a first protruding ring 331 formed on the bottom of the valve plate 3 and extending into the airbag cavity 51 in an interference fit manner; a first protruding block 332 formed on the bottom of the valve plate 3 and pressed against the crescent-shaped water outlet valve disc 54; and a first strip-shaped slot 333 formed on the bottom of the valve plate 3 and extending into the first protruding ring 331 and the first protruding block 332. The water outlet collection groove 53 is located between the three airbag cavities 51, and a first drainage hole 56 is provided at the center of the water outlet collection groove 53 that communicates with the water outlet valve port 42 and is used to drain water outward. Here, the piston rack 6 is used to alternately perform piston squeezing action on the three airbag cavities 51 of the tower-shaped piston plate 5, thereby continuously pumping the gas in the first shell 1 into the airbag cavity 51, and then discharged from the first drainage hole 56 through the water outlet collection groove 53, and utilizing the one-way valve function of the umbrella 10 and the crescent-shaped water outlet valve plate 54 to realize the unidirectional flow of water and complete the pressurized pumping of the liquid.

[0032] The bottom of the piston frame 6 is protrudingly formed with a first sleeve portion 67 that is sleeved on the steel needle shaft 9. The inclined hole 81 is eccentrically located on one side of the drive block 8. Here, the eccentrically arranged inclined hole 81 enables the steel needle shaft 9 to drive the piston frame 6 to swing when the drive block 8 rotates, continuously and alternately compressing the airbag cavity.

[0033] The lower end of the valve plate 3 is provided with at least three elastic snap arms 35 extending downward and used to match and snap with the first shell 1, and the outer wall of the first shell 1 is provided with at least three positioning blocks 15 for matching and snapping with the elastic snap arms 35. The outer wall of the second shell 2 is provided with at least three first positioning grooves 201 for the elastic snap arms 35 to pass through for positioning; the first positioning groove 201 protrudes upward from the upper end surface of the second shell 2, and the outer wall of the tower-shaped piston plate 5 is provided with at least three second positioning grooves 501 corresponding to the first positioning grooves 201.

[0034] A reinforcing rib 351 is provided on the inner side of the elastic snap arm 35, wherein a first locking groove 202 corresponding to the reinforcing rib 351 is provided in the first positioning groove 201, and a first notch 151 for the reinforcing rib 351 to pass through is provided in the middle of the locking block 15; at least three third positioning grooves 103 for accommodating the locking block 15 and for the elastic snap arm 35 to be inserted and locked are provided on the outer wall of the first shell 1, and a first gear bar 101 for limiting the elastic snap arm 35 is provided in the third positioning groove 103.

[0035] The motor 7 is fixed to the bottom of the first shell 1 by screws 70. The inner wall of the first shell 1 is provided with a first positioning column 17 protruding from the upper end surface and inserted into the second shell 2 for positioning, and the second shell 2 is provided with a fourth positioning groove 27 for the first positioning column 17 to be inserted and positioned.

[0036] To sum up, in the present invention, a number of water inlet holes 32 are opened on the valve plate 3, and an umbrella 10 is inserted into the valve plate 3 so that the umbrella 10 can slide up and down to open or close the water inlet hole 32, thereby forming a one-way valve between the water inlet groove 34 and the airbag cavity 51, and the tower-shaped piston plate 5 is provided with a crescent-shaped water outlet valve plate 54. The tower-shaped piston plate 5 forms a double-layer cavity design with a laminated structure with the second shell 2 and the valve plate 3, respectively, which realizes the separation of the water inlet laminate and the water outlet laminate in a limited space, effectively reduces the noise generated internally during operation, meets the standards of high quality and high stability, can be applied to devices with high requirements, and has a simple structure and is easy to maintain.

[0037] The following is an example of the process of an airbag cavity 51 being stretched and compressed by the piston frame 6: when the airbag cavity 51 of the tower-shaped piston plate 5 is stretched and its volume increases, the liquid enters the water inlet groove 34 from the air inlet valve port 41 on the valve cover 4, further, the umbrella 10 on the valve plate 3 is pushed open and flows into the airbag cavity 51 of the tower-shaped piston plate 5. At this time, the crescent-shaped water outlet valve plate 54 will press against the first protrusion block 332, so that the liquid cannot enter the water outlet conduit from the first strip groove 333. When the airbag cavity 51 of the tower-shaped piston plate 5 is compressed and its volume is reduced, the umbrella 10 is squeezed to cover the water inlet hole 32, and the liquid in the water inlet groove 34 stops flowing into the airbag cavity 51. At this time, the liquid in the airbag cavity 51 is squeezed to flow into the first strip groove 333 of the valve plate 3, and the crescent-shaped water outlet valve plate 54 is lifted and opened. Further, the liquid will enter the water outlet collecting groove 53 and then be discharged outward through the first drain port 56 and the water outlet valve port 42 in sequence. In this way, the piston frame 6 repeatedly pushes the three airbag cavities 51 on the tower-shaped piston plate 5 to alternately stretch and compress them, realizing the water pump function.

[0038] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A micro water pump with upper and lower laminated pistons, comprising: A first housing (1), a second housing (2), a valve plate (3), a valve cover (4), a tower-shaped piston piece (5) mounted on the second housing (2) from top to bottom and extending into the first housing (1), a piston rack (6) arranged in the first housing (1) and used to push the tower-shaped piston piece (5) to work, a motor (7) arranged at the bottom of the first housing (1), a drive block (8) arranged on the output shaft of the motor (7) and located in the first housing (1), and a steel needle shaft (9) arranged between the drive block (8) and the piston rack (6) and used for transmission, a water inlet valve port (41) and a water outlet valve port (42) are provided on the valve cover (4), and the invention is characterized in that: At least three insertion holes (31) are provided on the valve plate (3), a plurality of water inlet holes (32) are provided around each insertion hole (31), and an umbrella (10) for opening or closing the water inlet hole (32) is inserted into each insertion hole (31).

2. A micro water pump with upper and lower laminated pistons according to claim 1, characterized in that: The driving block (8) is provided with an inclined hole (81) for docking with the steel needle shaft (9), and the bottom of the inclined hole (81) is integrally provided with a hemispherical body (82) for contacting the steel needle shaft (9).

3. The micro water pump with upper and lower laminated pistons according to claim 1, characterized in that: The umbrella shank (10) comprises an insertion end (110) for inserting into the insertion hole (31), an umbrella edge (120) integrally formed with the insertion end (110) and capable of covering the water inlet hole (32), and a convex portion (130) formed on the insertion end (110), wherein the size of the convex portion (130) is larger than the inner diameter of the insertion hole (31).

4. The micro water pump with upper and lower laminated pistons according to claim 1, characterized in that: The valve cover (4) is mounted on the valve plate (3), and the valve plate (3) is provided with a water inlet groove (34) for communicating with the water inlet valve port (41); the tower-shaped piston plate (5) is provided with at least three airbag cavities (51) for alternate compression, and correspondingly, the piston rack (6) is provided with at least three piston columns (61) which are respectively interference-fitted and inserted into the first mounting holes (52) at the bottom of the airbag cavities (51).

5. The micro water pump with upper and lower laminated pistons according to claim 1, characterized in that: A water outlet collecting groove (53) is provided between the bottom of the tower-shaped piston plate (5) and the second housing (2), and at least three crescent-shaped water outlet valve plates (54) opening downward and communicating with the water outlet collecting groove (53) are provided on the tower-shaped piston plate (5), and at least three drainage structures (33) are provided at the bottom of the valve plate (3) for communicating the airbag cavity (51) with the crescent-shaped water outlet valve plates (54), respectively.

6. The micro water pump with upper and lower laminated pistons according to claim 5, characterized in that: The drainage structure (33) comprises a first convex ring (331) formed at the bottom of the valve plate (3) and extending into the airbag cavity (51) in an interference fit manner, a first protruding block (332) formed at the bottom of the valve plate (3) and pressed against the crescent-shaped water outlet valve plate (54), and a first strip-shaped slot (333) formed at the bottom of the valve plate (3) and extending into the first convex ring (331) and the first protruding block (332); the water outlet collecting groove (53) is located between the three airbag cavities (51), and a first drainage hole (56) is provided at the center of the water outlet collecting groove (53), which is in communication with the water outlet valve port (42) and is used for draining water outward.

7. The micro water pump with upper and lower laminated pistons according to claim 2, characterized in that: The bottom of the piston frame (6) is protrudingly formed with a first sleeve portion (67) sleeved on the steel needle shaft (9), and the inclined hole (81) is eccentrically located on one side of the driving block (8).

8. A micro water pump with upper and lower laminated pistons according to any one of claims 1 to 6, characterized in that: The lower end of the valve plate (3) is provided with at least three elastic snap-fit arms (35) extending downward and used for matching and snapping with the first shell (1); the outer wall of the first shell (1) is provided with at least three positioning blocks (15) used for matching and snapping with the elastic snap-fit arms (35); the outer wall of the second shell (2) is provided with at least three first positioning grooves (201) for the elastic snap-fit arms (35) to pass through for positioning; the first positioning grooves (201) protrude upward from the upper end surface of the second shell (2); and the outer wall of the tower-shaped piston plate (5) is provided with at least three second positioning grooves (501) positioned corresponding to the first positioning grooves (201).

9. The micro water pump with upper and lower laminated pistons according to claim 8, characterized in that: A reinforcing rib (351) is provided on the inner side of the elastic snap arm (35), wherein a first locking groove (202) corresponding to the locking rib (351) is provided in the first positioning groove (201), and a first notch (151) for the reinforcing rib (351) to pass through is provided in the middle of the locking block (15); at least three third positioning grooves (103) for accommodating the locking block (15) and for the elastic snap arm (35) to be inserted and locked are provided on the outer wall of the first shell (1), and a first gear bar (101) for limiting the position of the elastic snap arm (35) is provided in the third positioning groove (103).

10. A micro water pump with upper and lower laminated pistons according to any one of claims 1 to 6, characterized in that: The motor (7) is fixed to the bottom of the first housing (1) by means of screws (70); a first positioning column (17) protruding from the upper end surface and inserted into the second housing (2) for positioning is provided on the inner wall of the first housing (1); and a fourth positioning groove (27) for the first positioning column (17) to be inserted and positioned is provided on the second housing (2).

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