Quantitative dropper structure

Abstract

The utility model discloses a quantitative dropper structure which comprises a tube body, a quantitative sleeve, a pressing cap and a spring, a first step tube head is formed at the upper end of the tube body, a second step tube head is formed at the upper end of the first step tube head, and a quantitative gap is formed between the lower end of the quantitative sleeve and the upper end of the tube body. A limiting mechanism is arranged between the second step pipe head and the quantitative sleeve and used for limiting the vertical moving stroke of the quantitative sleeve, the pressing cap covers the upper end of the quantitative sleeve and is matched with the quantitative sleeve in a clamped mode, a soft rubber piston rod extending downwards is arranged in the center of the pressing cap, and the spring is arranged on the outer side of the piston rod in a sleeving mode. The spring is clamped between the pressing cap and the second step pipe head, a sealing ring is formed on the outer side wall of the piston rod, pipe holes communicated with the pipe body are formed in the center of the first step pipe head and the center of the second step pipe head, the piston rod is inserted into the pipe holes, and the sealing ring is in sealing fit with the inner walls of the pipe holes. The utility model has the characteristics of high tightness, accurate liquid taking amount and the like.

Description

Technical Field

[0001] This utility model relates to droppers, and more particularly to a quantitative dropper structure. Background Technology

[0002] A dropper is a device that draws solutions using negative pressure. Common droppers typically use an air bladder as the negative pressure generating mechanism. However, manually squeezing the air bladder makes it difficult to achieve quantitative liquid dispensing. In addition, for some extractable droppers, the sealing effect directly affects the amount of solution drawn. If the sealing performance is poor, it will lead to inaccurate liquid dispensing, which will adversely affect experiments, preparation, and other work. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a quantitative dropper structure with high sealing and accurate liquid dispensing, addressing the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] A quantitative dropper structure includes a tube body, a quantitative sleeve, a pressing cap, and a spring. The upper end of the tube body forms a first stepped tube head, and the upper end of the first stepped tube head forms a second stepped tube head. The quantitative sleeve is fitted over the outside of the first and second stepped tube heads. A quantitative gap exists between the lower end of the quantitative sleeve and the upper end of the tube body. A limiting mechanism is provided between the second stepped tube head and the quantitative sleeve to restrict the vertical movement of the quantitative sleeve. The pressing cap covers the upper end of the quantitative sleeve, and the two are engaged. A downwardly extending soft rubber piston rod is provided at the center of the pressing cap. The spring is fitted over the outside of the piston rod and is sandwiched between the pressing cap and the second stepped tube head. A sealing ring is formed on the outer wall of the piston rod. A tube hole communicating with the tube body is provided at the center of the first and second stepped tube heads. The piston rod is inserted into the tube hole, and the sealing ring is in a sealing fit with the inner wall of the tube hole.

[0006] Preferably, the edge of the pressing cap is evenly distributed with multiple buckles, and a retaining ring is formed on the inner side of the upper opening of the metering sleeve, with the multiple buckles engaging with the lower end of the retaining ring.

[0007] Preferably, a tapered transition portion is formed between the pressing cap and the piston rod.

[0008] Preferably, the diameter of the first stepped pipe head is smaller than the diameter of the pipe body.

[0009] Preferably, the diameter of the second stepped pipe head is smaller than the diameter of the first stepped pipe head.

[0010] Preferably, the limiting mechanism includes a limiting protrusion formed on the outer wall of the second stepped tube head and an inner stepped ring formed on the inner wall of the metering sleeve. The inner stepped ring is located between the limiting protrusion and the upper end of the first stepped tube head, and is driven by the elastic force applied by the spring to abut against the limiting protrusion.

[0011] Preferably, the piston rod and the pressing cap are integrally formed.

[0012] In the quantitative dropper structure disclosed in this utility model, the lower end of the tube body is provided with a liquid dispensing head assembly, and the upper end of the tube body is sequentially provided with a first stepped head and a second stepped head. The quantitative sleeve is sleeved on the outside of the first stepped head and the second stepped head. The pressing cap is fixed to the upper end of the quantitative sleeve. After the piston rod at the center of the pressing cap is inserted into the tube hole at the center of the first stepped head and the second stepped head, the piston rod and the tube hole are sealed together by the sealing ring formed on the outer wall of the piston rod. Since the piston rod and the sealing ring are made of soft rubber, the sealing performance between the piston rod and the tube hole is effectively improved, and the accuracy of liquid dispensing is also improved. In addition, during processing, the quantitative sleeve and the piston rod can be injection molded using hard plastic and soft plastic respectively, and then the two are assembled. Compared with the two-color injection molding process, the processing technology of this utility model is simple and the application cost is lower. Attached Figure Description

[0013] Figure 1 This is a three-dimensional view of the quantitative dropper structure of this utility model;

[0014] Figure 2 This is an exploded view of the quantitative dropper structure of this utility model;

[0015] Figure 3 A three-dimensional view of the tube;

[0016] Figure 4 A structural diagram of the metering sleeve, the pressing cap, and the spring;

[0017] Figure 5 This is a structural diagram of a quantitative cannula. Detailed Implementation

[0018] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0019] This utility model discloses a quantitative dropper structure, combined with Figures 1 to 5As shown, it includes a tube body 1, a metering sleeve 2, a pressing cap 3, and a spring 4. The upper end of the tube body 1 forms a first stepped tube head 10, and the upper end of the first stepped tube head 10 forms a second stepped tube head 11. The metering sleeve 2 is sleeved on the outside of the first stepped tube head 10 and the second stepped tube head 11. A metering gap exists between the lower end of the metering sleeve 2 and the upper end of the tube body 1. A limiting mechanism is provided between the second stepped tube head 11 and the metering sleeve 2 to limit the vertical movement of the metering sleeve 2. The pressing cap 3 covers the... The upper end of the quantitative sleeve 2 is engaged with the other two parts. The center of the pressing cap 3 is provided with a downwardly extending soft rubber piston rod 30. The spring 4 is sleeved on the outside of the piston rod 30 and is sandwiched between the pressing cap 3 and the second stepped tube head 11. A sealing ring 31 is formed on the outer wall of the piston rod 30. The center of the first stepped tube head 10 and the second stepped tube head 11 is provided with a tube hole 12 that communicates with the tube body 1. The piston rod 30 is inserted into the tube hole 12, and the sealing ring 31 is sealed with the inner wall of the tube hole 12.

[0020] In the above structure, the lower end of the tube body 1 is provided with a liquid dispensing tube head assembly 14, and the upper end of the tube body 1 is provided with a first stepped tube head 10 and a second stepped tube head 11 in sequence. The metering sleeve 2 is sleeved on the outside of the first stepped tube head 10 and the second stepped tube head 11. The pressing cap 3 is fixed to the upper end of the metering sleeve 2. After the piston rod 30 at the center of the pressing cap 3 is inserted into the tube hole 12 at the center of the first stepped tube head 10 and the second stepped tube head 11, the liquid dispensing tube head 14 passes through the hole formed on the outside of the piston rod 30. The sealing ring 31 on the side wall ensures a sealing fit between the piston rod 30 and the tube hole 12. Since the piston rod 30 and the sealing ring 31 are made of soft rubber, the sealing performance between the piston rod 30 and the tube hole 12 is effectively improved, and the accuracy of liquid volume is also improved. In addition, during processing, the metering sleeve 2 and the piston rod 30 can be injection molded separately using hard plastic and soft plastic, and then the two can be assembled. Compared with the two-color injection molding process, the processing technology of this utility model is simple and the application cost is lower.

[0021] To reliably fix the pressing cap 3 to the upper end of the metering sleeve 2, in this embodiment, multiple snap fasteners 32 are evenly distributed along the edge of the pressing cap 3, and a retaining ring 20 is formed inside the upper opening of the metering sleeve 2. The multiple snap fasteners 32 are all engaged with the lower end of the retaining ring 20. For practical applications, please refer to... Figure 4 The edge of the pressing cap 3 is preferably provided with three buckles 32.

[0022] As a preferred embodiment, the piston rod 30 and the pressing cap 3 are integrally formed. This integrally formed structure is more convenient for processing and manufacturing. Meanwhile, to improve the stress resistance between the piston rod 30 and the pressing cap 3, in this embodiment, a tapered transition portion 33 is formed between the pressing cap 3 and the piston rod 30.

[0023] Please see Figure 2 The diameter of the first stepped pipe head 10 is smaller than the diameter of the pipe body 1. Furthermore, the diameter of the second stepped pipe head 11 is smaller than the diameter of the first stepped pipe head 10.

[0024] In the above structure, the diameters of the tube body 1, the first stepped tube head 10, and the second stepped tube head 11 decrease sequentially. This structure facilitates the setting of a limiting mechanism between the second stepped tube head 11 and the quantitative sleeve 2.

[0025] Regarding the preferred structure of the limiting mechanism, in conjunction with Figures 2 to 5 As shown, the limiting mechanism includes a limiting protrusion 13 formed on the outer wall of the second stepped tube head 11 and an inner stepped ring 21 formed on the inner wall of the metering sleeve 2. The inner stepped ring 21 is located between the limiting protrusion 13 and the upper end of the first stepped tube head 10. The inner stepped ring 21 is driven to abut against the limiting protrusion 13 by the elastic force applied by the spring 4.

[0026] In the above structure, the limiting protrusion 13 is integrally formed on the outer wall of the second stepped tube head 11. Simultaneously, the inner stepped ring 21 is integrally formed with the metering sleeve 2 and protrudes inwards from the metering sleeve 2. For ease of installation, the lower edge of the inner stepped ring 21 can be provided with a beveled portion, allowing the inner stepped ring 21 to more easily pass over the limiting protrusion 13 and be confined between the limiting protrusion 13 and the upper end of the first stepped tube head 10. When the user presses the pressing cap 3, it needs to overcome the elastic force of the spring 4. The inner stepped ring 21 is located on the limiting protrusion 13... The spring 4 pushes the pressing cap 3 upwards. Under the action of the elastic force, the quantitative sleeve 2 and the pressing cap 3 rise synchronously and draw the solution into the tube body 1 until the inner step ring 21 abuts against the limiting protrusion ring 13, completing the quantitative aspiration function. During this process, the smooth movement between the various mechanisms not only facilitates manual operation, but also, based on the integrally formed piston rod 30, the pressing cap 3 and the sealing ring 31, can make the sealing degree at the piston connection higher and the liquid volume more accurate.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. All modifications, equivalent substitutions or improvements made within the technical scope of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A dosing pipette structure, characterized in that, The application relates to a quantitative feeding device, which comprises a tube body (1), a quantitative sleeve (2), a pressing cap (3) and a spring (4), wherein the upper end of the tube body (1) is formed with a first stepped tube head (10), the upper end of the first stepped tube head (10) is formed with a second stepped tube head (11), the quantitative sleeve (2) is sleeved outside the first stepped tube head (10) and the second stepped tube head (11), a quantitative gap is formed between the lower end of the quantitative sleeve (2) and the upper end of the tube body (1), a limiting mechanism is arranged between the second stepped tube head (11) and the quantitative sleeve (2), the limiting mechanism is used for limiting the up-down movement stroke of the quantitative sleeve (2), the pressing cap (3) is connected with the upper end of the quantitative sleeve (2) in a clamping mode, a soft rubber piston rod (30) extending downward is arranged at the center of the pressing cap (3), the spring (4) is sleeved outside the piston rod (30), the spring (4) is clamped between the pressing cap (3) and the second stepped tube head (11), a sealing ring (31) is formed on the outer wall of the piston rod (30), the center of the first stepped tube head (10) and the second stepped tube head (11) is arranged with a tube hole (12) connected with the tube body (1), the piston rod (30) is inserted into the tube hole (12), and the sealing ring (31) is sealingly connected with the inner wall of the tube hole (12).

2. The dosing dropper structure according to claim 1, wherein A plurality of buckles (32) are uniformly distributed on the edge of the pressing cap (3), and a clamping ring (20) is formed on the inner side of the upper end opening of the quantitative sleeve (2), wherein the buckles (32) are clamped on the lower end of the clamping ring (20).

3. The dosing dropper structure of claim 1, wherein, A tapered transition part (33) is formed between the pressing cap (3) and the piston rod (30).

4. The dosing dropper structure of claim 1, wherein, The diameter of the first stepped tube head (10) is smaller than that of the tube body (1).

5. The dosing dropper structure of claim 4, wherein, The diameter of the second stepped tube head (11) is smaller than that of the first stepped tube head (10).

6. The dosing dropper structure of claim 5, wherein, The limiting mechanism comprises a limiting convex ring (13) formed on the outer wall of the second stepped tube head (11) and an inner stepped ring (21) formed on the inner wall of the quantitative sleeve (2), the inner stepped ring (21) is located between the limiting convex ring (13) and the upper end of the first stepped tube head (10), and the inner stepped ring (21) is driven to abut against the limiting convex ring (13) by the elastic force of the spring (4).

7. The dosing dropper structure of claim 1, wherein, The piston rod (30) and the pressing cap (3) are integrally formed.

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