High-tightness dropper

Abstract

The high-tightness dropper comprises a dropper body, a sealing inner sleeve, a spring and a barrel-shaped buckle cap, a dropper opening is formed in the upper end of the dropper body, the sealing inner sleeve is embedded in the dropper opening, the sealing inner sleeve and the dropper opening are tightly matched, the barrel-shaped buckle cap is arranged on the outer side of the upper end of the dropper body in a sleeved mode, and the spring is arranged in the barrel-shaped buckle cap. A piston rod extending downwards is arranged in the center of the top of the barrel-shaped buckle cap and inserted into the sealing inner sleeve, an inner sealing ring is arranged on the inner wall of the sealing inner sleeve in a protruding mode, the inner sealing ring and the sealing inner sleeve are integrally formed, the inner sealing ring is arranged on the outer side of the piston rod in a sleeving mode, and the inner sealing ring and the piston rod are matched in a sealing mode. The spring is arranged on the outer side of the piston rod in a sleeving mode, and the spring is connected between the upper end of the pipe body and the top of the barrel-shaped buckle cap in an abutting mode. The utility model has the characteristics of better tightness, higher quantification precision and the like.

Description

Technical Field

[0001] This utility model relates to a quantitative dropper, and more particularly to a dropper with high sealing performance. Background Technology

[0002] A dropper is a laboratory tool used to draw solutions. Existing droppers include piston-type structures, which use a spring to drive the piston rod upward, creating a negative pressure inside the dropper. This negative pressure draws the solution into the dropper through the nozzle assembly at the lower end. To ensure a tight seal around the piston rod, a sealing ring groove is required on its outer side. The sealing ring is confined within this groove. Although this type of structure is commonly used, the engagement strength between the sealing ring groove and the sealing ring is insufficient. Over time, the sealing ring can easily detach from the groove, resulting in poor sealing and affecting the accuracy of the dropper's liquid dispensing, thus failing to meet application requirements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a dropper with better sealing and higher quantitative accuracy, in order to address the shortcomings of the existing technology.

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

[0005] A high-sealing dropper includes a tube body, a sealing inner sleeve, a spring, and a barrel-shaped cap. The upper end of the tube body has an opening, and the sealing inner sleeve is embedded in the opening with a tight fit. The barrel-shaped cap is fitted onto the outer side of the upper end of the tube body. A piston rod extending downwards is provided at the center of the top of the barrel-shaped cap. The piston rod is inserted into the sealing inner sleeve. An inner sealing ring protrudes from the inner wall of the sealing inner sleeve and is integrally formed with the sealing inner sleeve. The inner sealing ring is fitted onto the outer side of the piston rod with a tight seal. The spring is fitted onto the outer side of the piston rod and abuts against the upper end of the tube body and the top of the barrel-shaped cap.

[0006] Preferably, the piston rod and the barrel-shaped cap are integrally formed.

[0007] Preferably, the inner wall of the pipe opening is provided with multiple vertical limiting grooves, and the outer wall of the sealing inner sleeve is formed with multiple vertical limiting protrusions. The vertical limiting protrusions correspond one-to-one with the vertical limiting grooves, and the vertical limiting protrusions are engaged in the vertical limiting grooves.

[0008] Preferably, the width of the vertical limiting groove gradually decreases from top to bottom, and the width of the vertical limiting protrusion gradually decreases from top to bottom.

[0009] Preferably, the inner wall of the barrel-shaped cap has multiple limiting protrusions that are arranged in a ring. The upper outer side of the tube body has an upper limiting step and a lower limiting step, and the multiple limiting protrusions are located between the upper limiting step and the lower limiting step.

[0010] Preferably, a quantitative step portion is formed on the outer side of the tube body, the quantitative step portion is located below the lower limit step portion, and the quantitative step portion is used to abut against the lower end of the barrel-shaped cap.

[0011] In the high-sealing dropper disclosed in this utility model, the sealing inner sleeve is made of soft rubber and is embedded and fixed inside the tube opening. The piston rod is inserted into the sealing inner sleeve and seals with the inner sealing ring protruding from the inner wall of the sealing inner sleeve. When the user presses the barrel-shaped cap, the piston rod can slide up and down relative to the inner sealing ring. When the pressure on the barrel-shaped cap is released, the spring drives the piston rod to rise, creating a negative pressure in the tube and drawing the solution into the tube. Compared with the prior art that uses a sealing groove to restrict the sealing ring, this utility model can ensure that the sealing inner sleeve fits tightly with the tube and seals well with the piston rod, thereby achieving better sealing and higher quantitative accuracy. Attached Figure Description

[0012] Figure 1 An exploded view of a high-sealing dropper;

[0013] Figure 2 This is a cross-sectional view of a barrel-shaped buckle cap;

[0014] Figure 3 This is a diagram of the internal structure of a barrel-shaped buckle cap;

[0015] Figure 4 Structural diagram of the pipe body and sealing inner sleeve;

[0016] Figure 5 This is a three-dimensional view of the sealed inner sleeve. Detailed Implementation

[0017] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0018] This utility model discloses a high-sealing dropper, combined with... Figures 1 to 5As shown, it includes a tube body 1, a sealing inner sleeve 2, a spring 3, and a barrel-shaped cap 4. The upper end of the tube body 1 forms a tube opening 10. The sealing inner sleeve 2 is embedded in the tube opening 10 and the two are tightly fitted. The barrel-shaped cap 4 is fitted on the outer side of the upper end of the tube body 1. A piston rod 40 extending downward is provided at the center of the top of the barrel-shaped cap 4. The piston rod 40 is inserted into the sealing inner sleeve 2. The inner wall of the sealing inner sleeve 2 has a protruding inner sealing ring 20. The inner sealing ring 20 is integrally formed with the sealing inner sleeve 2. The inner sealing ring 20 is fitted on the outer side of the piston rod 40 and the two are sealed together. The spring 3 is fitted on the outer side of the piston rod 40 and abuts against the upper end of the tube body 1 and the top of the barrel-shaped cap 4.

[0019] In the above structure, the sealing inner sleeve 2 is made of soft rubber and is embedded and fixed inside the tube opening 10. The piston rod 40 is inserted into the sealing inner sleeve 2 and is sealed with the inner sealing ring 20 protruding from the inner wall of the sealing inner sleeve 2. When the user presses the barrel-shaped cap 4, the piston rod 40 can slide up and down relative to the inner sealing ring 20. When the pressing pressure on the barrel-shaped cap 4 is released, the spring 3 drives the piston rod 40 to rise, creating a negative pressure inside the tube body 1 and drawing the solution into the tube body 1. Compared with the existing technology that uses a sealing groove to restrict the sealing ring, this utility model can ensure that the sealing inner sleeve 2 is tightly fitted with the tube body 1 and can also seal well with the piston rod 40, thereby achieving better sealing and higher quantitative accuracy.

[0020] For ease of manufacturing, in this embodiment, the piston rod 40 and the barrel-shaped cap 4 are integrally formed. Specifically, the piston rod 40 and the barrel-shaped cap 4 can be injection molded from rigid plastic.

[0021] Regarding the preferred fitting method between the sealing inner sleeve 2 and the pipe opening 10, in this embodiment, the sealing inner sleeve 2 and the pipe body 1 are manufactured by a two-color injection molding process. In order to improve the tightness of the two-color injection molding, the inner wall of the pipe opening 10 is provided with a plurality of vertical limiting grooves 11, and the outer wall of the sealing inner sleeve 2 is formed with a plurality of vertical limiting protrusions 21. The vertical limiting protrusions 21 correspond one-to-one with the vertical limiting grooves 11, and the vertical limiting protrusions 21 are engaged in the vertical limiting grooves 11.

[0022] In the above structure, the corresponding insertion and matching of multiple vertical limiting protrusions 21 and multiple vertical limiting grooves 11 not only limits the angle of the sealing inner sleeve 2, but also increases the contact surface between the sealing inner sleeve 2 and the pipe opening 10, making the two more tightly and reliably combined. Specifically, the sealing inner sleeve 2 and the pipe body 1 are processed by a two-color injection molding process (hard rubber + soft rubber), which can make the sealing inner sleeve 2 and the pipe opening 10 have a higher degree of bonding.

[0023] As a preferred embodiment, the width of the vertical limiting groove 11 gradually decreases from top to bottom, and the width of the vertical limiting protrusion 21 also gradually decreases from top to bottom. In this embodiment, a limiting groove and limiting protrusion that are wider at the top and narrower at the bottom are preferably matched. When the user presses the barrel-shaped cap 4, the connection between the vertical limiting protrusion 21 and the vertical limiting groove 11 becomes tighter, and the frictional force is greater, thereby better overcoming the influence of the reaction force during the elastic lifting process.

[0024] This embodiment has a limiting effect on the active stroke of the barrel-shaped buckle 4, combined with Figures 1 to 3 As shown, the inner wall of the barrel-shaped cap 4 has multiple limiting protrusions 41, which are arranged in a ring. The upper outer side of the tube body 1 has an upper limiting step 12 and a lower limiting step 13, and the multiple limiting protrusions 41 are all located between the upper limiting step 12 and the lower limiting step 13.

[0025] Furthermore, a quantitative step portion 14 is formed on the outer side of the tube body 1. The quantitative step portion 14 is located below the lower limit step portion 13. The quantitative step portion 14 is used to abut against the lower end of the barrel-shaped cap 4.

[0026] In the above structure, the upper limit step 12 and the lower limit step 13 limit the limiting protrusion 41, and the quantitative step 14 abuts against the lower end of the barrel-shaped cap 4, thereby controlling the movement of the barrel-shaped cap 4 and achieving the purpose of quantitative liquid dispensing.

[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 high seal dropper characterized in that, The utility model relates to a kind of piston rod and bucket-shaped buckle cap, including tube body (1), sealing inner sleeve (2), spring (3) and bucket-shaped buckle cap (4), the upper end of the tube body (1) is formed with pipe orifice (10), the sealing inner sleeve (2) is embedded in the pipe orifice (10) and is closely matched, the bucket-shaped buckle cap (4) is sleeved on the upper end outside of the tube body (1), the top center of the bucket-shaped buckle cap (4) is equipped with downwardly extending piston rod (40), the piston rod (40) is inserted in the sealing inner sleeve (2), the inner wall of the sealing inner sleeve (2) is protruded with inner sealing ring (20), the inner sealing ring (20) is integrally formed with the sealing inner sleeve (2), the inner sealing ring (20) is sleeved on the outside of the piston rod (40) and is sealedly matched, the spring (3) is sleeved on the outside of the piston rod (40), and the spring (3) is abutted between the upper end of the tube body (1) and the top of the bucket-shaped buckle cap (4).

2. The high seal dropper of claim 1, wherein, The piston rod (40) is integrally formed with the bucket-shaped buckle cap (4).

3. The high seal dropper of claim 1, wherein, The inner wall of the pipe orifice (10) is provided with a plurality of vertical limiting grooves (11), the outer side wall of the sealing inner sleeve (2) is formed with a plurality of vertical limiting convex edges (21), the vertical limiting convex edges (21) correspond to the vertical limiting grooves (11) one by one, and the vertical limiting convex edges (21) are clamped in the vertical limiting grooves (11).

4. The high seal dropper of claim 3, wherein, The width of the vertical limiting groove (11) gradually decreases from top to bottom, and the width of the vertical limiting convex edge (21) gradually decreases from top to bottom.

5. The high seal dropper of claim 1, wherein, The inner wall of the bucket-shaped buckle cap (4) is protruded to form a plurality of limiting convex buckles (41), and the plurality of limiting convex buckles (41) are annularly distributed, the upper end of the tube body (1) is formed with an upper limiting step portion (12) and a lower limiting step portion (13), and the plurality of limiting convex buckles (41) are located between the upper limiting step portion (12) and the lower limiting step portion (13).

6. The high seal-strength dropper of claim 5, wherein, The outer side of the tube body (1) is formed with a dosing step portion (14), and the dosing step portion (14) is located below the lower limiting step portion (13), and the dosing step portion (14) is used for abuttingly matching with the lower end of the bucket-shaped buckle cap (4).

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