Quantitative dropper

Abstract

The quantitative dropper comprises a dropper body, a diaphragm, an elastic support, a push rod and a pressing cap, a dropping pipette head is formed at the lower end of the dropper body, the elastic support is fixedly arranged at the top end of the dropper body, the diaphragm covers an opening in the upper end of the dropper body and is fixedly clamped between the elastic support and the dropper body, and a through hole is formed in the center of the elastic support. The lower end of the push rod penetrates through the through hole and abuts against the diaphragm, the upper end of the push rod is sleeved with the pressing cap, the pressing cap and the push rod are fixedly connected, the elastic support comprises two vertical supporting arms extending upwards, limiting protruding parts are arranged on the two sides of the push rod respectively, the limiting protruding parts are close to the upper end of the push rod, and bent parts are formed at the upper ends of the two vertical supporting arms respectively. The two bent parts are arranged above the two limiting protruding parts, and an elastic reset assembly used for jacking the push rod is arranged between the two vertical supporting arms. The device has the characteristics of convenience in operation, simple structure, easiness in assembly, safety, reliability and the like.

Description

Technical Field

[0001] The invention relates to a dripping device, in particular to a quantitative dropper. Background Art

[0002] Quantitative droppers are often used in chemical and pharmaceutical laboratories. The structure of a conventional quantitative dropper can be found in the Chinese patent publication with the publication number CN204638220U, entitled "Quantitative Dropper", which describes: "A quantitative dropper 1 comprises: a quantitative tube 110, wherein a through cavity with a specified volume (the specified volume is 1 ml, 2 ml or 5 ml) is provided inside the quantitative tube 110 for quantitatively measuring liquid; an overflow tube 120, which is sleeved on the upper part of the quantitative tube 110 and connected to the outer wall of the quantitative tube 110, and a hole is formed between the quantitative tube 110 and the overflow tube 120. An overflow chamber 126 for storing liquid is formed between the overflow tube 120 and the overflow tube 120. A first opening 121 for connecting to a rubber head is provided at the top of the overflow tube 120. A rubber head 130 is provided at the first opening of the overflow tube 130 and is used to provide negative pressure to draw liquid into the quantitative dropper 1. When the rubber head 130 is squeezed, negative pressure is generated in the quantitative dropper 1, drawing liquid through the quantitative dropper 1. A specified volume of liquid can be measured through the quantitative tube 110. When the volume of the drawn liquid exceeds the capacity of the quantitative tube 1, the liquid enters the overflow chamber 126. This type of structure relies on the hollow rubber head to provide negative pressure. During use, the rubber head needs to be squeezed repeatedly, which is inconvenient for manual operation. In addition, for some piston-type droppers, the springs and other structures used therein are prone to pollution, rust and other hazards, and cannot meet the requirements of safe and reliable application. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a quantitative dropper which is convenient to operate, simple in structure, easy to assemble, safe and reliable, in view of the deficiencies in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] The cam is secured to the top of the tube and is adapted to engage the cam face of the push rod, the cam being secured to the top of the tube and adapted to engage the cam when the push rod is in engagement with the cam face.

[0006] Preferably, a first concave step is provided on both sides of the push rod, and a limit stop portion is formed on the opposite side of the two vertical arms. The limit stop portion is provided below the first concave step. When the push rod moves downward a preset distance, the first concave step abuts against the limit stop portion.

[0007] Preferably, there are bayonet holes on both sides of the push rod, and the elastic reset assembly includes two first elastic arms, the ends of the two first elastic arms are respectively clamped in the two bayonet holes, and when the push rod moves downward, the push rod drives the two first elastic arms to deform.

[0008] Preferably, the two first elastic arms are respectively provided on the two limiting and resisting portions, and the first elastic arms are in an inverted "L" shape.

[0009] Preferably, a second concave step is provided on both sides of the push rod, and the two second concave steps are respectively arranged below the two first concave steps. The elastic reset assembly includes two second elastic arms, and the ends of the two second elastic arms respectively abut against the two first concave steps. When the push rod moves downward, the push rod drives the two second elastic arms to deform.

[0010] Preferably, the second elastic support arm is "S"-shaped, and the second elastic support arm is provided on the elastic support.

[0011] Preferably, a first wedge-shaped portion with an upwardly inclined surface is formed at the end of the vertical support arm, and a second wedge-shaped portion with a downwardly inclined surface is formed at the end of the limiting protrusion.

[0012] Preferably, an inner step edge is formed on the inner side of the top end of the tube body, the edge of the diaphragm abuts against the inner step edge, and the elastic support is disc-shaped and is clamped on the inner side of the top end of the tube body.

[0013] Preferably, a plurality of fastening openings are evenly distributed on the outer wall of the top end of the tube body, and a plurality of buckles are formed on the edge of the elastic support, and the plurality of buckles are respectively fastened in the plurality of fastening openings.

[0014] Preferably, a sealing ring is formed on the edge of the diaphragm, and the diameter of the sealing ring is greater than the thickness of the diaphragm.

[0015] When the pressure on the push cap is pressed, the push rod presses down the diaphragm to deform the diaphragm, and the pressure in the tube increases, thereby causing the medicine to drip out through the dropper head. Conversely, when the user removes the pressure on the push cap, the push rod is reset upward under the action of the lifting elastic force applied by the elastic reset component, and the diaphragm is reset under its own elastic action, and negative pressure is generated in the tube body, thereby sucking in the medicine. Based on the above principle, the present invention realizes the functions of sucking in and dripping out the medicine, and the quantitative dropper adopts a pressing operation and does not use a hollow rubber head, which is convenient for users to hold and operate. At the same time, the quantitative dropper has a simple structure and is easy to assemble. It does not rely on the metal spring to reset, thus avoiding pollution caused by spring rust, and has better safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a stereoscopic image of a quantitative dropper;

[0017] Figure 2 This is an exploded view of the quantitative dropper;

[0018] Figure 3 This is a cross-sectional view of a quantitative dropper;

[0019] Figure 4 This is an exploded view of the diaphragm, elastic support, push rod and pressing cap;

[0020] Figure 5 This is the structural diagram after the elastic support and push rod are assembled;

[0021] Figure 6 This is the structural diagram after the elastic support and push rod are disassembled. DETAILED DESCRIPTION

[0022] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0023] The present invention discloses a quantitative dropper, combined with Figures 1 to 6As shown, it includes a tube body 1, a diaphragm 2, an elastic support 3, a push rod 4 and a pressing cap 5. The lower end of the tube body 1 is formed with a drip tube head 10. The elastic support 3 is fixed to the top of the tube body 1. The diaphragm 2 covers the upper end opening of the tube body 1, and the diaphragm 2 is clamped between the elastic support 3 and the tube body 1. A through hole 30 is opened at the center of the elastic support 3. The lower end of the push rod 4 passes through the through hole 30 and abuts against the diaphragm 2. The pressing cap 5 The cap 5 is sleeved on the upper end of the push rod 4 and the two are fixedly connected. The elastic support 3 includes two vertical support arms 31 extending upward. A limiting protrusion 40 is provided on both sides of the push rod 4. The limiting protrusion 40 is close to the upper end of the push rod 4. The upper ends of the two vertical support arms 31 are respectively formed with a bending portion 32. The two bending portions 32 are respectively arranged above the two limiting protrusions 40. An elastic reset component 33 for lifting the push rod 4 is provided between the two vertical support arms 31.

[0024] In the above structure, the dropper head 10 at the lower end of the tube body 1 is used to inhale and drip out the liquid medicine, the diaphragm 2 is clamped between the elastic support 3 and the tube body 1, and the lower end of the push rod 4 passes through the through hole 30 and abuts against the diaphragm 2. When the pressing cap 5 is pressed, the push rod 4 presses down the diaphragm 2 to deform the diaphragm 2, and the pressure in the tube body 1 increases, thereby causing the liquid medicine to drip out through the dropper head 10. Conversely, when the user removes the pressure on the pressing cap 5, the liquid medicine is discharged. Under the action of the lifting elastic force applied by the elastic reset component 33, the push rod 4 resets upward, the diaphragm 2 resets under its own elastic action, and negative pressure is generated in the tube body 1 to suck in the medicine. Based on the above principle, the present invention realizes the function of sucking in and dripping out the medicine. The quantitative dropper adopts a pressing operation and does not use a hollow rubber head, which is convenient for users to hold and operate. At the same time, the above-mentioned quantitative dropper has a simple structure and is easy to assemble. It does not rely on the metal spring to reset, avoids pollution caused by spring rust, and has better safety and reliability.

[0025] See Figure 2 、 Figure 5 and Figure 6 As shown, first concave steps 41 are respectively provided on both sides of the push rod 4, and limited position retaining portions 34 are respectively formed on the opposite sides of the two vertical support arms 31. The limited position retaining portions 34 are provided below the first concave steps 41. When the push rod 4 moves downward a preset distance, the first concave steps 41 abut against the limited position retaining portions 34.

[0026] In the above structure, the two bending portions 32 cooperate with the two limiting protrusions 40 to limit the push rod 4 in its upward movement, and the limiting stop portion 34 cooperates with the first concave step 41 to limit the push rod 4 in its downward movement.

[0027] In order to realize the elastic reset function, in this embodiment, the two sides of the push rod 4 are respectively provided with a bayonet 42, and the elastic reset component 33 includes two first elastic support arms 330, and the ends of the two first elastic support arms 330 are respectively clamped in the two bayonet 42. When the push rod 4 moves downward, the push rod 4 drives the two first elastic support arms 330 to deform.

[0028] Furthermore, the two first elastic arms 330 are respectively provided on the two limiting and resisting portions 34 , and the first elastic arms 330 are in an inverted “L” shape.

[0029] As a preferred embodiment, the push rod 4 is provided with a second concave step 43 on each side, and the two second concave steps 43 are respectively provided below the two first concave steps 41. The elastic reset assembly 33 includes two second elastic arms 331, and the ends of the two second elastic arms 331 respectively abut against the two first concave steps 41. When the push rod 4 moves downward, the push rod 4 drives the two second elastic arms 331 to deform. The second elastic arms 331 are "S"-shaped and are provided on the elastic support 3.

[0030] In the above structure, the elastic support 3, the first elastic support arm 330, and the second elastic support arm 331 are made of plastic injection molding. Compared with the use of metal springs, this embodiment integrates the support mechanism and the elastic mechanism into one, which is convenient for injection molding and will not cause rust pollution.

[0031] In this embodiment, a first wedge-shaped portion 310 with an upwardly inclined surface is formed at the end of the vertical support arm 31 , and a second wedge-shaped portion 400 with a downwardly inclined surface is formed at the end of the limiting protrusion 40 .

[0032] As a preferred embodiment, an inner step edge 11 is formed on the inner side of the top end of the tube body 1, and the edge of the diaphragm 2 abuts against the inner step edge 11. The elastic support 3 is disc-shaped and is clamped to the inner side of the top end of the tube body 1. Furthermore, a plurality of fastening openings 12 are uniformly distributed on the outer wall of the top end of the tube body 1, and a plurality of snaps 35 are formed on the edge of the elastic support 3, and the plurality of snaps 35 are respectively clamped in the plurality of fastening openings 12.

[0033] During assembly of this embodiment, the diaphragm 2 is first covered on the inner step edge 11, and then the elastic support 3 is snapped into the inner side of the top end of the tube body 1. Based on the matching relationship between the multiple clips 35 and the multiple fixing ports 12, the elastic support 3 is fixed, and under the clamping action of the elastic support 3 and the inner step edge 11, the diaphragm 2 is fixed. Then, the lower end of the push rod 4 can be passed through the through hole 30. Based on the cooperation of the first wedge-shaped portion 310 and the second wedge-shaped portion 400, the two limiting protrusions 40 are conveniently snapped into the bottom of the two bent portions 32. Then, the pressing cap 5 is sleeved on the upper end of the push rod 4, and the two are fixedly connected.

[0034] In order to reliably fix the diaphragm 2 and maintain the sealing degree of the edge position of the diaphragm 2, in this embodiment, a sealing ring 20 is formed on the edge of the diaphragm 2, and the diameter of the sealing ring 20 is greater than the thickness of the diaphragm 2.

[0035] Regarding the preferred fixing method between the pressing cap 5 and the push rod 4, in this embodiment, the top wall of the pressing cap 5 is formed with an inner sleeve 50, the inner wall of the inner sleeve 50 is formed with a plurality of slots 51, the inner sleeve 50 is sleeved on the upper end of the push rod 4, and a plurality of protrusions 44 are formed on the outer side of the upper end of the push rod 4, and the plurality of protrusions 44 are respectively clamped in the plurality of slots 51.

[0036] To protect the dropper head 10 , in this embodiment, a protective cap 13 is screwed onto the outer side of the dropper head 10 .

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quantitative dropper, characterized in that: The invention comprises a tube body (1), a diaphragm (2), an elastic support (3), a push rod (4) and a pressing cap (5); the lower end of the tube body (1) is formed with a dropper head (10); the elastic support (3) is fixed to the top end of the tube body (1); the diaphragm (2) covers the upper end opening of the tube body (1); and the diaphragm (2) is clamped between the elastic support (3) and the tube body (1); a through hole (30) is opened at the center of the elastic support (3); the lower end of the push rod (4) passes through the through hole (30) and abuts against the diaphragm (2); The pressing cap (5) is sleeved on the upper end of the push rod (4) and the two are fixedly connected. The elastic support (3) includes two vertical support arms (31) extending upward. A limiting protrusion (40) is provided on both sides of the push rod (4). The limiting protrusion (40) is close to the upper end of the push rod (4). The upper ends of the two vertical support arms (31) are respectively formed with a bending portion (32). The two bending portions (32) are respectively arranged above the two limiting protrusions (40). An elastic reset component (33) for lifting the push rod (4) is provided between the two vertical support arms (31).

2. The quantitative dropper according to claim 1, wherein A first concave step (41) is provided on both sides of the push rod (4), and a limit stop portion (34) is formed on the opposite side of the two vertical support arms (31). The limit stop portion (34) is provided below the first concave step (41). When the push rod (4) moves downward by a preset distance, the first concave step (41) abuts against the limit stop portion (34).

3. The quantitative dropper according to claim 2, wherein The push rod (4) is provided with a bayonet (42) on both sides, and the elastic reset assembly (33) includes two first elastic support arms (330). The ends of the two first elastic support arms (330) are respectively clamped in the two bayonet (42). When the push rod (4) moves downward, the push rod (4) drives the two first elastic support arms (330) to deform.

4. The quantitative dropper according to claim 3, wherein The two first elastic support arms (330) are respectively arranged on the two position-limiting and resisting portions (34), and the first elastic support arms (330) are in an inverted "L" shape.

5. The quantitative dropper according to claim 1, wherein The push rod (4) is provided with a second concave step (43) on both sides, and the two second concave steps (43) are respectively arranged below the two first concave steps (41). The elastic reset component (33) includes two second elastic support arms (331), and the ends of the two second elastic support arms (331) are respectively in contact with the two first concave steps (41). When the push rod (4) moves downward, the push rod (4) drives the two second elastic support arms (331) to deform.

6. The quantitative dropper according to claim 5, characterized in that The second elastic support arm (331) is in an "S" shape, and the second elastic support arm (331) is arranged on the elastic support seat (3).

7. The quantitative dropper according to claim 1, wherein The end of the vertical support arm (31) is formed with a first wedge-shaped portion (310) with an upwardly inclined surface, and the end of the position-limiting protrusion (40) is formed with a second wedge-shaped portion (400) with a downwardly inclined surface.

8. The quantitative dropper according to claim 1, wherein An inner step edge (11) is formed on the inner side of the top end of the tube body (1), and the edge of the diaphragm (2) abuts against the inner step edge (11). The elastic support (3) is disc-shaped and is clamped on the inner side of the top end of the tube body (1).

9. The quantitative dropper according to claim 8, wherein The outer wall of the top end of the tube body (1) is evenly distributed with a plurality of fastening openings (12), and the edge of the elastic support (3) is formed with a plurality of buckles (35), and the plurality of buckles (35) are respectively fastened in the plurality of fastening openings (12).

10. The quantitative dropper according to claim 1, wherein A sealing ring (20) is formed on the edge of the diaphragm (2), and the diameter of the sealing ring (20) is greater than the thickness of the diaphragm (2).

Images