quantitative pipette

Abstract

The utility model provides a kind of quantitative dropper, comprising: tube body, including pressing tube and the main body pipe connected with pressing tube, main body pipe is provided with the containing cavity for containing liquid, pressing tube is provided with quantitative pressing channel, one end of containing cavity and quantitative pressing channel are communicated, and the other end is provided with liquid outlet;Pressing assembly, including pressing cap and the piston rod connected with pressing cap, piston rod extends into quantitative pressing channel and and quantitative pressing channel sealing cooperation, pressing cap is set in pressing tube outer;Quantitative channel is formed between first protrusion and second protrusion for sliding protrusion to slide, one of pressing tube and pressing cap is provided with sliding protrusion, and the other is provided with quantitative channel, first protrusion is used to limit sliding protrusion in initial position, and second protrusion is used to limit sliding protrusion in quantitative position.The utility model is in the form that reagent tube top is provided with vesicle in prior art, can make the pressing stroke of pressing assembly larger, and pressing touch is better.

Description

Technical Field

[0001] This utility model belongs to the field of testing consumables technology, and in particular relates to a quantitative dropper. Background Technology

[0002] In biological or medical testing, testing personnel typically use reagent tubes to store and transfer reagents or liquid samples, adding the reagent or liquid sample into the reagent to be tested for analysis. When using existing reagent tubes for reagent or sample transfer, testing personnel often rely on manual judgment for quantitative pipetting or use vesicles on the reagent tubes to transfer liquids by pressing the vesicles, as exemplified by the reagent tubes and testing equipment claimed in CN220027061U.

[0003] Due to the limited size of existing vesicles, the pressing space is small, resulting in a poor pressing feel and requiring repeated pressing to complete typical liquid transfer needs. Because the vesicles are flexible, operators cannot ensure their fingers completely cover the vesicle when pressing. Furthermore, differences in pressing pressure among operators lead to variations in the amount of liquid squeezed out. Additionally, the operator cannot ensure consistent pressing strokes with each press, resulting in low liquid transfer accuracy with the metering dropper. Utility Model Content

[0004] The main purpose of this invention is to propose a quantitative dropper, which aims to solve the technical problems of poor pressing feel and low quantitative accuracy of existing quantitative droppers.

[0005] To achieve the above objectives, this utility model provides a quantitative dropper, the quantitative dropper comprising:

[0006] The tube body includes a pressing tube and a main tube connected to the pressing tube. The main tube is provided with a receiving cavity for containing liquid. The pressing tube is provided with a metering pressing channel. One end of the receiving cavity is connected to the metering pressing channel, and the other end is provided with a liquid outlet. The pressing assembly includes a pressing cap and a piston rod connected to the pressing cap. The piston rod extends into the metering pressing channel and is sealed with the metering pressing channel. The pressing cap is sleeved on the pressing tube. The limiting assembly includes a first protrusion, a second protrusion, and a sliding protrusion. A metering channel for sliding of the sliding protrusion is formed between the first protrusion and the second protrusion. One of the pressing tube and the pressing cap is provided with the sliding protrusion, and the other is provided with the metering channel. The first protrusion is used to limit the sliding protrusion to an initial position, and the second protrusion is used to limit the sliding protrusion to a metering position.

[0007] In this embodiment of the present invention, the quantitative channel is arranged around the piston rod, the radial section of the first protrusion gradually narrows towards the liquid outlet and forms a first limiting slope, the sliding protrusion is provided with a first slope, and the first limiting slope is used to abut against the first slope and limit the position to the initial position.

[0008] In this embodiment of the present invention, the radial cross section of the second protrusion gradually expands towards the liquid outlet and forms a second limiting slope. The sliding protrusion is provided with a second slope, and the second limiting slope is used to abut against the second slope and limit the position at a quantitative position.

[0009] In this embodiment of the utility model, the piston rod includes: a connecting platform connected to the pressing cover; and a rod body connected to the connecting platform, wherein the cross-sectional dimension of the connecting platform is larger than the cross-sectional dimension of the rod body, and the rod body is used to extend into the metering channel and seal with the metering channel.

[0010] In this embodiment of the invention, the piston rod further includes a sealing ring, and the rod body has an installation groove for engaging the sealing ring. The rod body is sealed and fitted with the metering channel through the sealing ring.

[0011] In this embodiment of the utility model, the quantitative dropper further includes a dropper head connected to the bottom of the main tube and a tube cap sealing the dropper head. The dropper head and the tube body are detachably connected, and the tube cap and the dropper head are detachably connected.

[0012] In this embodiment of the utility model, the tube cap includes: a cap body for inserting the dripper and being detachably connected to the dripper; a guide protrusion for guiding and engaging with the dripper; and a sealing post for extending into the dripper and sealingly engaging with the dripper.

[0013] In this embodiment of the invention, the dropper is provided with a flow guiding cavity, the cross-sectional dimensions of which gradually decrease towards the tube cap and form a flow guiding slope for guiding liquid; and / or, the dropper is provided with a vertical flow guiding protrusion, the flow guiding protrusion having a straight flow guiding surface, the extension direction of which is consistent with the axial direction of the metering dropper.

[0014] In this embodiment of the invention, the cross-sectional dimension of the pressing tube is smaller than that of the main tube, so that the main tube forms a limiting platform that abuts against the bottom surface of the pressing cover.

[0015] In this embodiment of the present invention, the pressing assembly further includes an elastic reset member housed within the pressing cover and sleeved outside the piston rod. The elastic reset member is used to drive the piston rod to reset from a fixed position to the initial position through the pressing cover under its own elastic force.

[0016] Through the above technical solution, the quantitative dropper provided by this utility model embodiment has the following beneficial effects:

[0017] When using a metering dropper to contain liquid, the first protrusion and the sliding protrusion work together to limit the pressing component relative to the tube body to the initial position. When the liquid in the containing cavity of the main tube needs to be transferred, the pressing component can be pressed to move it relative to the tube body towards the dispensing port. The piston rod located in the metering pressing channel moves relative to the metering pressing channel, compressing the gas in the metering pressing channel. The gas pressure in the containing cavity increases, causing the solution in the containing cavity to flow towards the outlet under the action of gas pressure until the second protrusion and the sliding protrusion come into contact. The second protrusion limits the sliding protrusion, which corresponds to the tube body, to the metering position, preventing the operator from pressing the pressing component further. This invention utilizes a pressing tube with a quantitative pressing channel at the top of the main tube to fully make use of the tube's empty space. Compared to the existing technology where a vesicle is set at the top of the reagent tube, this allows for a larger pressing stroke and a better pressing feel, improving the ease of use of the quantitative dropper. With the cooperation of the limiting component, it ensures that the pressing component is properly assembled relative to the tube while also ensuring the quantitative accuracy of the pressing component, avoiding situations where the quantitative accuracy is low due to different pressing forces or contact. Furthermore, the size of the quantitative pressing channel can be set according to the quantitative liquid requirements to meet different quantitative needs and avoid the need for multiple pressings.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a quantitative dropper according to an embodiment of the present invention;

[0021] Figure 2 This is an exploded structural diagram of a quantitative dropper according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of a quantitative dropper according to an embodiment of the present invention;

[0023] Figure 4 yes Figure 3 A partial structural diagram;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the dropper head of a quantitative dropper according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the cap of a quantitative dropper according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the piston rod structure of a quantitative dropper according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures

[0028] Label Name Label Name

[0029] 100 Quantitative Dropper 4 Second Protrusion

[0030] 1 Pipe body 41 second limiting slope

[0031] 11 Press tube 5 Sliding protrusion

[0032] 111 Quantitative pressing channel 51 First inclined surface

[0033] 12 Main tube 52 Second inclined plane

[0034] 121 Receptacle 6 Quantitative Channel

[0035] 122 Limiting Platform 7 Dropper

[0036] 2 Pressing assembly 71 Flow guide cavity

[0037] 21 Press cap 711 Guide slope

[0038] 22 Piston rod 72 Vertical drainage protrusion

[0039] 221 Connecting platform 721 Straight drainage surface

[0040] 222 rod body 8 tube cap

[0041] 223 Sealing ring 81 Cap body

[0042] 23 Elastic reset element 82 Guide protrusion

[0043] 3. First protrusion 83 sealing column

[0044] 31 First limiting inclined plane Detailed Implementation

[0045] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0046] The quantitative dropper according to this utility model is described below with reference to the accompanying drawings.

[0047] like Figures 1 to 7 As shown in the embodiment of this utility model, the quantitative dropper 100 includes a tube body 1, a pressing assembly 2, and a limiting assembly. The tube body 1 includes a pressing tube 11 and a main tube 12 connected to the pressing tube 11. The main tube 12 is provided with a receiving cavity 121 for containing liquid. The pressing tube 11 is provided with a quantitative pressing channel 111. One end of the receiving cavity 121 is connected to the quantitative pressing channel 111, and the other end is provided with a liquid outlet. The pressing assembly 2 includes a pressing cap 21 and a piston rod 22 connected to the pressing cap 21. The piston rod 22 extends into... The quantitative pressing channel 111 is sealed and fitted inside and with the pressing cover 21, which is sleeved on the outside of the pressing tube 11. The limiting component includes a first protrusion 3, a second protrusion 4 and a sliding protrusion 5. A quantitative channel 6 is formed between the first protrusion 3 and the second protrusion 4 for the sliding protrusion 5 to slide. One of the pressing tube 11 and the pressing cover 21 is provided with the sliding protrusion 5, and the other is provided with the quantitative channel 6. The first protrusion 3 is used to limit the sliding protrusion 5 to the initial position, and the second protrusion 4 is used to limit the sliding protrusion 5 to the quantitative position.

[0048] like Figure 3 As shown, the pressing component 2 is in its initial position relative to the tube body 1. At its highest point relative to the tube body 1, the pressing component 2 continues to press downwards until the sliding protrusion 5 abuts against the second protrusion 4, thus limiting the pressing component 2 to a quantitative position. At the quantitative position, the pressing component 2 is at its lowest point relative to the tube body 1, and further downward pressure cannot be applied. It should be noted that the quantitative dropper 100 in this embodiment is mainly used for sample or reagent transfer during nucleic acid detection. Sample solutions or reagent solutions used for nucleic acid detection can be placed in the receiving cavity 121. The pressing component 2 is located at the top of the tube body 1, and the outlet is located at the bottom of the tube body 1. The pressure cap and piston rod 22 in the pressing component 2 move synchronously during the pressing process. These two components can be connected as two independent parts, or they can be integrally molded, with the piston rod 22 integrally molded onto the pressure cap. The first protrusion 3 and the second protrusion 4 are spaced apart along the axial direction of the quantitative dropper 100.

[0049] When the metering dropper 100 is used to contain liquid, the pressing component 2 can be positioned relative to the tube body 1 in an initial position by the cooperation of the first protrusion 3 and the sliding protrusion 5. When the liquid in the receiving cavity 121 of the main tube 12 needs to be transferred, the pressing component 2 can be pressed to move relative to the tube body 1 towards the dispensing port. The piston rod 22 located in the metering pressing channel 111 moves relative to the metering pressing channel 111, compressing the gas in the metering pressing channel 111. The gas pressure in the receiving cavity 121 increases, causing the solution in the receiving cavity 121 to flow towards the outlet under the action of gas pressure until the second protrusion 4 and the sliding protrusion 5 come into contact. The second protrusion 4 limits the sliding protrusion 5 to the metering position relative to the tube body 1, preventing the operator from pressing the pressing component 2 further. In this embodiment, by setting a pressing tube 11 with a quantitative pressing channel 111 at the top of the main tube 12, the empty space of the tube body 1 is fully utilized. Compared with the form of setting a vesicle at the top of the reagent tube in the prior art, the pressing component 2 can have a larger pressing stroke and a better pressing feel, which can improve the ease of use of the quantitative dropper 100. With the cooperation of the limiting component, it can ensure that the pressing component 2 is assembled in place relative to the tube body 1, and at the same time, it can ensure the quantitative accuracy of the pressing component 2, avoiding the situation that the quantitative accuracy is not high due to different force or pressing contact. Furthermore, the size of the quantitative pressing channel 111 can be set according to the quantitative liquid requirements to meet different quantitative needs and avoid the need for multiple pressing.

[0050] Specifically, the quantitative channel 6 is arranged around the piston rod 22. The radial section of the first protrusion 3 gradually narrows towards the outlet and forms a first limiting slope 31. The sliding protrusion 5 is provided with a first slope 51. The first limiting slope 31 is used to abut against the first slope 51 and limit the position to the initial position. In this embodiment, the first protrusion 3 can be set at the top of the pressing tube 11 and surround the outer wall of the pressing tube 11. The piston rod 22 extends into the quantitative pressing channel 111 of the pressing tube 11. The pressing cover 21 is arranged around the outside of the pressing tube 11. By nesting from the inside to the outside, the pressing accuracy of the pressing assembly 2 can be ensured. In this embodiment, the first protrusion 3 shrinks from the outside to the inside. The first slope 51 and the first limiting slope 31 are in surface contact. When assembling the pressing assembly 2, the first slope 51 abuts against the first limiting slope 31. The sliding protrusion 5 is arranged around the inner wall of the pressing cover 21, which can ensure the limiting stability between the pressing assembly 2 and the tube body 1. In other embodiments, the first protrusion 3 may be arranged around the inner wall of the press cover 21.

[0051] In one embodiment, the radial cross-section of the second protrusion 4 gradually expands towards the outlet and forms a second limiting slope 41. The sliding protrusion 5 is provided with a second slope 52. The second limiting slope 41 is used to abut against the second slope 52 and limit the position at a quantitative position. In this embodiment, the first protrusion 3 and the second protrusion 4 are both arranged around the outer wall of the pressing tube 11, and the sliding protrusion 5 is arranged around the inner wall of the pressing cover 21. When the sliding protrusion 5 is in the quantitative position relative to the second protrusion 4, the second limiting slope 41 and the second slope 52 are in surface contact. The second limiting slope 41 can support the second slope 52, ensuring the limiting stability between the pressing assembly 2 and the tube body 1. In other embodiments, the first protrusion 3 and the second protrusion 4 can be arranged around the inner wall of the pressing cover 21, and the sliding protrusion 5 can be arranged around the outer wall of the pressing tube 11.

[0052] It should be noted that the piston rod 22 includes a connecting platform 221 and a rod body 222. The connecting platform 221 is connected to the pressing cover 21; the rod body 222 is connected to the connecting platform 221, and the cross-sectional dimension of the connecting platform 221 is larger than the cross-sectional dimension of the rod body 222. The rod body 222 is used to extend into the metering channel 6 and to seal with the metering channel 6. Figure 3 , Figure 4 and Figure 7 As shown, in this embodiment, the cross-section of the connecting platform 221 is multi-layered stepped. The middle position of the pressing cover 21 is provided with a multi-layered stepped groove that engages with the connecting platform 221. This groove can limit the movement of the pressing cover 21 and the piston rod 22 during the pressing process. The rod body 222 is connected to the bottom of the connecting platform 221. The rod body 222 is a slender cylindrical rod. The shape of the quantitative pressing channel 111 and the rod body 222 are adapted to each other, which can ensure a longer pressing stroke.

[0053] like Figure 7 As shown, the piston rod 22 also includes a sealing ring 223. The rod body 222 has an installation groove for engaging the sealing ring 223. The rod body 222 and the metering channel 6 are sealed together by the sealing ring 223. In this embodiment, the installation groove is located on the outer wall of the rod body 222, the sealing ring 223 is an O-ring, and the installation groove is located near the bottom of the rod body 222. By engaging the sealing ring 223 with the installation groove, the rod body 222 and the sealing ring 223 can fit tightly together, while also reducing the thickness of the sealing ring 223 protruding relative to the rod body 222. This ensures a good seal between the piston rod 22 and the metering pressing channel 111, while also avoiding excessive friction between the sealing ring 223 and the metering pressing channel 111, thus improving the smoothness of pressing the pressing assembly 2.

[0054] In one embodiment, the quantitative dropper 100 further includes a dropper 7 connected to the bottom of the main tube 12 and a cap 8 for sealing the dropper 7. The dropper 7 and the tube body 1 are detachably connected, and the cap 8 and the dropper 7 are also detachably connected. In this embodiment, the bottom of the main tube 12 is provided with an external thread section, and the dropper 7 is provided with an internal thread section that is threadedly engaged with the external thread section. The bottom of the dropper 7 may be provided with an external thread section, and the cap 8 may be provided with an internal thread section that is threadedly engaged with the dropper 7. To facilitate the installation and removal of the dropper 7 and the cap 8, the outer walls of the dropper 7 and the cap 8 may be provided with anti-slip textures. A swab or similar object can be placed into the main tube 12 by removing the dropper 7. In this embodiment, the detachable connection between the tube body 1, the dropper 7, and the cap 8 facilitates the use of the quantitative dropper 100, and the cap 8 seals the dropper 7, preventing the solution inside the quantitative dropper 100 from being contaminated by the outside.

[0055] like Figure 6 The cap 8 includes a cap body 81, a guide protrusion 82, and a sealing post 83. The cap body 81 is used for the insertion of the dropper 7 and is detachably connected to the dropper 7; the guide protrusion 82 guides and cooperates with the dropper 7; the sealing post 83 is used to extend into the dropper 7 and seal with the dropper 7. In this embodiment, the bottom of the cap body 81 is provided with a sealing post 83 that can extend into the dropper 7. By sealing the dropper 7 with the sealing post 83, it is ensured that the solution in the quantitative dropper 100 does not leak out. Moreover, the lateral sealing method of the sealing post 83 means that the production precision requirements of the quantitative dropper 100 are not high, making it easy to produce and providing a good sealing effect. In this embodiment, the number of guide protrusions 82 can be set according to actual usage requirements. In one embodiment, there are multiple guide protrusions 82, which are arranged at intervals around the sealing post 83.

[0056] It should be noted that the dripper 7 is provided with a flow guiding cavity 71. The cross-sectional dimensions of the flow guiding cavity 71 gradually narrow towards the cap 8, forming a flow guiding slope 711 for guiding the liquid. Furthermore, the dripper 7 is provided with a vertical flow guiding protrusion 72, which has a straight flow guiding surface 721. The extension direction of the straight flow guiding surface 721 is consistent with the axial direction of the metering dropper 100. In this embodiment, the cross-section of the flow guiding cavity 71 is inverted conical, which allows the liquid to be guided by the flow guiding slope 711. Simultaneously, the straight flow guiding surface ensures smooth liquid flow out of the dripper 7. To fully utilize the cavity space within the dripper 7, the vertical flow guiding protrusion 72 can be thin, and the number of vertical flow guiding protrusions 72 can be set according to actual usage requirements.

[0057] In one embodiment, the cross-sectional dimension of the pressing tube 11 is smaller than that of the main tube 12, so that the main tube 12 forms a limiting platform 122 that abuts against the bottom surface of the pressing cap 21. When the pressing component 2 is pressed relative to the tube body 1 to the quantitative position, the second protrusion 4 and the sliding protrusion 5 cooperate in a limiting manner, while the limiting platform 122 abuts against the bottom surface of the main tube 12, so that the tube body 1 and the pressing cap 21 form a double limiting, avoiding the situation where the limiting structure is unstable and the quantitative pipetting error is large. In this embodiment, the number of the first protrusion 3, the second protrusion 4 and the sliding protrusion 5 is one. In other embodiments, the number of the first protrusion 3, the second protrusion 4 and the sliding protrusion 5 can be set according to the actual use requirements.

[0058] like Figures 2 to 4 As shown, the pressing assembly 2 also includes an elastic reset member 23 housed within the pressing cover 21 and sleeved outside the piston rod 22. The elastic reset member 23 is used to reset the piston rod 22 from the metering position to the initial position through the pressing cover 21 under its own elastic force. In this embodiment, the elastic reset member 23 can be a spring. When the operator presses the pressing assembly 2 from the initial position, the pressing cover 21 squeezes and compresses the elastic reset member 23 until the pressing assembly 2 is pressed to the metering position. When the external force is removed, the elastic reset member 23, through its own elastic force, drives the pressing cover 21 and the piston rod 22 to the top and reset to the initial position. This facilitates subsequent operations of the metering dropper 100 and allows the metering dropper 100 to be reused.

[0059] It should be noted that, in one embodiment, the dripper 7 adopts a TIP tip design, which can be easily inserted into other tubes, reducing liquid residue at the mouth, and ensuring that the dripping liquid meets the design standard. The tube body 1 is a one-piece molded part with a tube capacity of 2.5ml. The stroke of the piston rod 22 can be 5mm, and the dripping volume is 24ul. The sealing ring 223 can be made of rubber. By fitting the sealing ring 223 onto the rod body 222 made of hard material, a longer pressing stroke is ensured, while the accuracy of the dripping volume can be controlled by ensuring the seal.

[0060] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A quantitative dropper, characterized in that, The metering dropper (100) includes: The tube body (1) includes a pressing tube (11) and a main tube (12) connected to the pressing tube (11). The main tube (12) is provided with a receiving cavity (121) for containing liquid. The pressing tube (11) is provided with a quantitative pressing channel (111). One end of the receiving cavity (121) is connected to the quantitative pressing channel (111), and the other end is provided with a liquid outlet. The pressing assembly (2) includes a pressing cover (21) and a piston rod (22) connected to the pressing cover (21). The piston rod (22) extends into the quantitative pressing channel (111) and is sealed to the quantitative pressing channel (111). The pressing cover (21) is sleeved on the pressing tube (11). The limiting component includes a first protrusion (3), a second protrusion (4), and a sliding protrusion (5). A metering channel (6) for sliding of the sliding protrusion (5) is formed between the first protrusion (3) and the second protrusion (4). One of the pressing tube (11) and the pressing cover (21) is provided with the sliding protrusion (5), and the other is provided with the metering channel (6). The first protrusion (3) is used to limit the sliding protrusion (5) to an initial position, and the second protrusion (4) is used to limit the sliding protrusion (5) to a metering position.

2. The quantitative dropper according to claim 1, characterized in that, The quantitative channel (6) is arranged around the piston rod (22). The radial section of the first protrusion (3) gradually narrows towards the liquid outlet and forms a first limiting slope (31). The sliding protrusion (5) is provided with a first slope (51). The first limiting slope (31) is used to abut against the first slope (51) and limit the position to the initial position.

3. The quantitative dropper according to claim 2, characterized in that, The radial section of the second protrusion (4) gradually expands towards the liquid outlet and forms a second limiting slope (41). The sliding protrusion (5) is provided with a second slope (52). The second limiting slope (41) is used to abut against the second slope (52) and limit the position at a quantitative position.

4. The quantitative dropper according to claim 1, characterized in that, The piston rod (22) includes: The connecting platform (221) is connected to the pressing cover (21); A rod (222) is connected to the connecting platform (221). The cross-sectional dimension of the connecting platform (221) is larger than that of the rod (222). The rod (222) is used to extend into the quantitative channel (6) and seal with the quantitative channel (6).

5. The quantitative dropper according to claim 4, characterized in that, The piston rod (22) also includes a sealing ring (223). The rod body (222) has an installation groove for engaging the sealing ring (223). The rod body (222) is sealed and fitted with the metering channel (6) through the sealing ring (223).

6. The quantitative dropper according to any one of claims 1 to 5, characterized in that, The quantitative dropper (100) also includes a dropper (7) connected to the bottom of the main tube (12) and a tube cap (8) sealing the dropper (7). The dropper (7) and the tube body (1) are detachably connected, and the tube cap (8) and the dropper (7) are detachably connected.

7. The quantitative dropper according to claim 6, characterized in that, The cap (8) includes: Cap (81) is used for the insertion of the dropper (7) and for detachable connection with the dropper (7); The guide protrusion (82) is guided and cooperates with the dropper (7); A sealing post (83) is used to extend into the dripper (7) and seal with the dripper (7).

8. The quantitative dropper according to claim 6, characterized in that, The dripper (7) is provided with a flow guiding cavity (71), and the cross-sectional dimensions of the flow guiding cavity (71) gradually decrease towards the tube cap (8) to form a flow guiding slope (711) for guiding liquid. And / or, The dripper (7) is provided with a vertical drainage protrusion (72), and the drainage protrusion is provided with a straight drainage surface (721). The extension direction of the straight drainage surface (721) is consistent with the axial direction of the metering dropper (100).

9. The quantitative dropper according to any one of claims 1 to 5, characterized in that, The cross-sectional dimension of the pressing tube (11) is smaller than that of the main tube (12), so that the main tube (12) forms a limiting platform (122) that limits and abuts against the bottom surface of the pressing cover (21).

10. The quantitative dropper according to any one of claims 1 to 5, characterized in that, The pressing assembly (2) further includes an elastic reset member (23) housed within the pressing cover (21) and sleeved outside the piston rod (22). The elastic reset member (23) is used to drive the piston rod (22) from the quantitative position back to the initial position through the pressing cover (21) under its own elastic force.

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