An elastic pulling type dropper

Abstract

The present invention discloses an elastic pulling type dropper, which comprises a liquid storage tube, an annular sealing cover, an insertion ring body, a liquid discharge central tube, and an elastic pulling assembly; by the blocking of the flow limiting cover, the present invention avoids the drawback that most of the liquid is discharged from the liquid discharge central tube, resulting in the liquid inside the annular quantitative liquid storage cavity not being full. In this way, most of the liquid flows into the annular quantitative liquid storage cavity from the periphery of the flow limiting cover, making the annular quantitative liquid storage cavity filled with a quantitative amount of liquid, and the excess liquid is discharged from the gap between the flow limiting cover and the liquid discharge central tube, so that the excess liquid is discharged from the liquid discharge central tube, achieving stable quantitative liquid taking.

Description

Technical Field

[0001] The present invention relates to an elastic pulling type dropper. Background Art

[0002] A quantitative dropper is a device that extrudes liquid from the inside of a tube body. It is widely used in medical tests, especially for virus detection, and is an essential medical device. For example, for the detection of the novel coronavirus, existing quantitative droppers generally include a tube body and a dropper head. The dropper head is inserted into the upper opening of the tube body, and a liquid discharge tube for squeezing out the liquid is provided on the dropper head. In actual use, the tube body is generally filled with a reagent, and then the collected specimen to be tested is sent into the reagent in the tube body. Then, the dropper head is inserted into the upper end of the tube body to achieve a sealed connection. Then, the tube body is inverted, and the reagent containing the specimen in the tube body is squeezed out through the channel tube of the dropper head by force. In the patent with the publication number CN 214974114 U, a liquid storage cavity is provided to intercept the excess liquid. However, when the liquid is discharged in an inverted state, the liquid will concentrate and be discharged through the liquid discharge tube. As a result, the liquid in the liquid storage cavity has not been filled yet, and the liquid is discharged, making the discharged liquid inaccurate. In addition, the specific volume of the discharged liquid needs to be calculated by subtracting the liquid intercepted by the liquid storage cavity from the liquid inside the tube body, which cannot be intuitively reflected, and it is not convenient to control the volume. Summary of the Invention

[0003] Aiming at the deficiencies of the above-mentioned prior art, the problem solved by the present invention is to provide an elastic pulling type dropper that can discharge and separate liquids in an orderly manner and can intuitively control the quantity.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] An elastic pulling type dropper, comprising a liquid storage tube, an annular sealing cover, an extending ring body, a liquid discharging central tube, and an elastic pulling assembly; the lower end periphery of the annular sealing cover is provided with the extending ring body; a liquid discharging central tube is fixedly connected through the middle of the annular sealing cover; an annular quantitative liquid storage cavity is formed between the outer periphery of the liquid discharging central tube and the inner periphery of the extending ring body; the annular sealing cover is installed on the upper end periphery of the liquid storage tube; the extending ring body and the liquid discharging central tube are inserted into the liquid storage tube; the outer periphery of the extending ring body is hermetically connected with the inner periphery of the liquid storage tube; the elastic pulling assembly is installed on the liquid discharging central tube; the elastic pulling assembly includes a pull ring, a central connecting rod, a sealing telescopic ring, a limiting slide rod, a squeezing elastic body, a current limiting cover, a positioning ring body, an abutting convex block, and a limiting block; the pull ring is installed on the upper end periphery of the liquid discharging central tube; the sealing telescopic ring is installed between the lower end periphery of the pull ring and the upper end periphery of the liquid discharging central tube; the central connecting rod is installed at the inner axis of the liquid discharging central tube; the upper end of the central connecting rod is connected to the inner side of the pull ring, the lower end of the central connecting rod extends below the lower end of the liquid discharging central tube, and the lower end of the central connecting rod is connected to the middle inside of the current limiting cover; the longitudinal section of the current limiting cover is in a U-shaped structure; a liquid discharging hole is arranged in the middle of the lower end of the current limiting cover; the abutting convex blocks are respectively installed on both sides of the lower end of the liquid discharging central tube; the positioning ring body is installed on the inner periphery of the liquid storage tube; the limiting slide rods are arranged on both sides of the central connecting rod; limiting card slots are arranged on both sides inside the liquid discharging central tube; the limiting slide rods are slidably clamped on the limiting card slots; the limiting blocks are installed on both sides inside the upper end of the liquid discharging central tube; the squeezing elastic body is sleeved on the outer periphery of the central connecting rod, and the upper and lower ends of the squeezing elastic body are respectively elastically pressed between the limiting blocks and the limiting slide rods; when the pull ring is pulled upward, the upper end of the current limiting cover is driven to abut against the abutting convex blocks on both sides of the lower end of the liquid discharging central tube; when the pull ring moves downward, the squeezing elastic body presses the limiting slide rod to move downward, and at the same time drives the current limiting cover to downwardly abut against the upper end periphery of the positioning ring body.

[0006] Further, a guiding ring body is arranged on the inner periphery of the upper end of the current limiting cover; the upper end of the guiding ring body is located inside the lower end of the liquid discharging central tube.

[0007] Further, upper side rods are arranged on both sides of the upper end of the central connecting rod, and the outer ends of the upper side rods are connected to the inner side of the pull ring; lower side rods are arranged on both sides of the lower end of the central connecting rod, and the outer ends of the lower side rods are connected to the inner side of the current limiting cover.

[0008] Further, a sealing pressing ring is arranged on the upper end periphery of the positioning ring body; the current limiting cover downwardly abuts against the sealing pressing ring on the upper end periphery of the positioning ring body.

[0009] Further, an outwardly convex docking ring body is arranged on the outer periphery of the lower end of the pull ring; an inwardly concave annular table surface is arranged on the outer periphery of the upper end of the liquid discharging central tube; the outwardly convex docking ring body is in docking connection or separation with the inwardly concave annular table surface.

[0010] Furthermore, a plurality of abutting sealing rings are provided on the inner sides around the liquid storage tube; the outer sides around the lower end and the outer sides around the middle of the extending ring body abut against the inner sides around the abutting sealing rings.

[0011] Furthermore, the longitudinal section of the liquid storage tube is in a U-shaped structure.

[0012] The beneficial effects of the present invention are as follows:

[0013] When quantitative dripping is required in the present invention, first pull the pull ring, drive the flow-limiting cover to abut upward against the abutting bumps on both sides of the lower end of the liquid discharge central tube through the central connecting rod, then invert the whole structure, squeeze the liquid storage tube, and a small amount of liquid is discharged from the liquid discharge hole in the middle of the flow-limiting cover. The blocking of the flow-limiting cover avoids the disadvantage that most of the liquid is discharged from the liquid discharge central tube and the liquid inside the annular quantitative liquid storage cavity is not filled. In this way, most of the liquid flows into the annular quantitative liquid storage cavity from around the flow-limiting cover, making the annular quantitative liquid storage cavity filled with a quantitative amount of liquid, and the excess liquid is discharged from the gap between the flow-limiting cover and the liquid discharge central tube, so that the excess liquid is discharged from the liquid discharge central tube. Then, invert the whole structure again, so that the quantitative liquid located in the annular quantitative liquid storage cavity flows back into the liquid storage tube, and then release the pull ring. By squeezing the elastic body, the limiting sliding rod is pressed to move downward, and at the same time, the flow-limiting cover is driven to abut downward against the upper ends around the positioning ring body, so as to realize the sealing of the quantitative liquid inside the liquid storage tube. Finally, invert the whole structure again, squeeze the liquid storage tube so that the quantitative liquid inside it is discharged from the liquid discharge hole of the flow-limiting cover, and the quantitative liquid is then discharged from the liquid discharge central tube to the outside, thus realizing the collection of the quantitative liquid. Description of the Drawings

[0014] Figure 1 It is a schematic structural view of the flow-limiting cover of the present invention abutting upward against the abutting bumps on both sides of the lower end of the liquid discharge central tube.

[0015] Figure 2 It is a schematic structural view of the flow-limiting cover of the present invention abutting downward against the upper ends around the positioning ring body.

[0016] Figure 3 For the present invention Figure 1 is an enlarged structural view.

[0017] Figure 4 For the present invention Figure 2 is an enlarged structural view. Detailed Embodiments

[0018] The following further details the content of the present invention in conjunction with the drawings.

[0019] As Figures 1 to 4As shown in the figure, an elastic pulling type dropper includes a liquid storage tube 1, an annular sealing cover 2, an insertion ring body 3, a liquid discharge central tube 4, and an elastic pulling assembly 5; the lower end of the annular sealing cover 2 is provided with an insertion ring body 3 around its circumference; a liquid discharge central tube 4 is fixedly connected through the middle of the annular sealing cover 2; an annular quantitative liquid storage cavity 9 is formed between the outer sides of the liquid discharge central tube 4 and the inner sides of the insertion ring body 3 around its circumference; the annular sealing cover 2 is installed around the upper end of the liquid storage tube 1; the insertion ring body 3 and the liquid discharge central tube 4 are inserted into the liquid storage tube 1; the outer sides of the insertion ring body 3 are hermetically connected to the inner sides of the liquid storage tube 1 around its circumference; the elastic pulling assembly 5 is installed on the liquid discharge central tube 4; the elastic pulling assembly 5 includes a pull ring 51, a central connecting rod 52, a sealing expansion ring 54, a limiting slide bar 58, a squeezing elastic body 57, a current limiting cover 53, a positioning ring body 59, an abutting convex block 55, and a limiting block 56; the pull ring 51 is installed around the upper end of the liquid discharge central tube 4; a sealing expansion ring 54 is installed between the lower ends of the pull ring 51 and the upper end of the liquid discharge central tube 4 around its circumference; a central connecting rod 52 is installed at the inner axis of the liquid discharge central tube 4; the upper end of the central connecting rod 52 is connected to the inner side of the pull ring 51, the lower end of the central connecting rod 52 extends below the lower end of the liquid discharge central tube 4, and the lower end of the central connecting rod 52 is connected to the middle inside the current limiting cover 53; the longitudinal section of the current limiting cover 53 is in a U-shaped structure; a liquid discharge hole 531 is provided in the middle of the lower end of the current limiting cover 53; abutting convex blocks 55 are respectively installed on both sides of the lower end of the liquid discharge central tube 4; a positioning ring body 59 is installed around the inner circumference of the liquid storage tube 1; limiting slide bars 58 are provided on both sides of the central connecting rod 52; limiting card slots 41 are provided on both sides inside the liquid discharge central tube 4; the limiting slide bars 58 are slidably clamped on the limiting card slots 41; limiting blocks 56 are installed on both sides inside the upper end of the liquid discharge central tube 4; the squeezing elastic body 57 is sleeved around the outer side of the central connecting rod 52, and the upper and lower ends of the squeezing elastic body 57 are respectively elastically pressed between the limiting blocks 56 and the limiting slide bars 58; when the pull ring 51 is pulled upward, the upper end of the current limiting cover 53 is driven to abut against the abutting convex blocks 55 on both sides of the lower end of the liquid discharge central tube 4; when the pull ring 51 moves downward, the squeezing elastic body 57 presses the limiting slide bars 58 to move downward, and at the same time drives the current limiting cover 53 to abut downward against the upper end of the positioning ring body 59 around its circumference.

[0020] As Figures 1 to 4 shown, in order to prevent the liquid from flowing back from between the current limiting cover 53 and the liquid discharge central tube 4 into the annular quantitative liquid storage cavity 9 when discharging a quantitative amount of liquid, further preferably, a diversion ring body 532 is provided on the inner side of the upper end of the current limiting cover 53 around its circumference; the upper end of the diversion ring body 532 is located inside the lower end of the liquid discharge central tube 4, so that through the diversion of the diversion ring body 532, the liquid will not flow back from between the current limiting cover 53 and the liquid discharge central tube 4 into the annular quantitative liquid storage cavity 9.

[0021] As Figures 1 to 4As shown, in order to facilitate the connection of the upper and lower ends of the central connecting rod 52 to the pull ring 51 and the flow-limiting cover 53, it is further preferred that upper side rods 521 are provided on both sides of the upper end of the central connecting rod 52, and the outer ends of the upper side rods 521 are connected to the inner side of the pull ring 51; lower side rods 522 are provided on both sides of the lower end of the central connecting rod 52, and the outer ends of the lower side rods 522 are connected to the inner side of the flow-limiting cover 53.

[0022] As Figures 1 to 4 As shown, in order to achieve the sealed abutment between the flow-limiting cover 53 and the positioning ring body 59, it is further preferred that a sealing abutment ring is provided around the upper end of the positioning ring body 59; the flow-limiting cover 53 abuts downward against the sealing abutment ring around the upper end of the positioning ring body 59.

[0023] As Figures 1 to 4 As shown, in order to enable the stable docking of the pull ring 51 and the liquid discharge central pipe 4, it is further preferred that an outwardly convex docking ring body 511 is provided on the outer side around the lower end of the pull ring 51; an inwardly concave annular table surface 42 is provided on the outer side around the upper end of the liquid discharge central pipe 4; the outwardly convex docking ring body 511 is docked and connected or separated from the inwardly concave annular table surface 42.

[0024] As Figures 1 to 4 As shown, in order to achieve the sealed abutment between the insertion ring body 3 and the liquid storage pipe 1, further, a plurality of abutment sealing rings 11 are provided on the inner side around the liquid storage pipe 1; the outer side around the lower end and the outer side around the middle of the insertion ring body 3 abut against the inner side around the abutment sealing rings 11. Further, the longitudinal section of the liquid storage pipe 1 is in a U-shaped structure.

[0025] When quantitative dripping is required in the present invention, first pull the pull ring 51, drive the flow-limiting cover 53 to abut upward against the abutting bumps 55 on both sides of the lower end of the liquid discharge central tube 4 through the central connecting rod 52, then invert the whole structure, squeeze the liquid storage tube 1, and a small amount of liquid is discharged through the liquid discharge hole 531 in the middle of the flow-limiting cover 53. The flow-limiting cover 53 prevents most of the liquid from being discharged from the liquid discharge central tube 4, thus avoiding the drawback that the liquid inside the annular quantitative liquid storage cavity 9 is not full. In this way, through the blocking of the flow-limiting cover 53, most of the liquid flows into the annular quantitative liquid storage cavity 9 from the periphery of the flow-limiting cover 53, making the annular quantitative liquid storage cavity 9 filled with quantitative liquid. The excess liquid is discharged from the gap between the flow-limiting cover 53 and the liquid discharge central tube 4, and the excess liquid is discharged from the liquid discharge central tube 4. Then, invert the whole structure again, so that the quantitative liquid in the annular quantitative liquid storage cavity 9 flows back into the liquid storage tube 1. Then release the pull ring 51, and the elastic body 47 is squeezed to press the limit slide rod 58 to move downward, and at the same time drive the flow-limiting cover 53 to abut downward against the periphery of the upper end of the positioning ring body 59, so as to realize the sealing of the quantitative liquid inside the liquid storage tube 1. Finally, invert the whole structure again, squeeze the liquid storage tube 1 so that the quantitative liquid inside it is discharged from the liquid discharge hole 531 of the flow-limiting cover 53, and the quantitative liquid is then discharged from the liquid discharge central tube 4 to the outside, thus realizing the collection of the quantitative liquid.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An elastic pulling type dropper, characterized in that, It includes a liquid storage tube, an annular closing cover, an extending ring body, a liquid discharge central tube, and an elastic pulling assembly; the lower end of the annular closing cover is provided with an extending ring body around it; a liquid discharge central tube is fixedly connected through the middle of the annular closing cover; an annular quantitative liquid storage cavity is formed between the outer sides of the liquid discharge central tube and the inner sides of the extending ring body around it; the annular closing cover is installed around the upper end of the liquid storage tube; the extending ring body and the liquid discharge central tube are inserted into the liquid storage tube; the outer sides of the extending ring body are hermetically connected to the inner sides of the liquid storage tube; the elastic pulling assembly is installed on the liquid discharge central tube; the elastic pulling assembly includes a pull ring, a central connecting rod, a sealing telescopic ring, a limiting slide rod, a squeezing elastic body, a current limiting cover, a positioning ring body, an abutting convex block, and a limiting block; the pull ring is installed around the upper end of the liquid discharge central tube; a sealing telescopic ring is installed between the lower end around the pull ring and the upper end around the liquid discharge central tube; a central connecting rod is installed at the inner axis of the liquid discharge central tube; the upper end of the central connecting rod is connected to the inner side of the pull ring, the lower end of the central connecting rod extends below the lower end of the liquid discharge central tube, and the lower end of the central connecting rod is connected to the middle inside the current limiting cover; the longitudinal section of the current limiting cover is in a U-shaped structure; a liquid discharge hole is provided in the middle of the lower end of the current limiting cover; abutting convex blocks are respectively installed on both sides of the lower end of the liquid discharge central tube; a positioning ring body is installed around the inner circumference of the liquid storage tube; limiting slide rods are provided on both sides of the central connecting rod; limiting card slots are provided on both sides inside the liquid discharge central tube; the limiting slide rods are slidably clamped on the limiting card slots; limiting blocks are installed on both sides inside the upper end of the liquid discharge central tube; the squeezing elastic body is sleeved around the outer side of the central connecting rod, and the upper and lower ends of the squeezing elastic body are respectively elastically pressed between the limiting block and the limiting slide rod; when the pull ring is pulled upward, the upper end of the current limiting cover is driven to abut against the abutting convex blocks on both sides of the lower end of the liquid discharge central tube; when the pull ring moves downward, the squeezing elastic body presses the limiting slide rod to move downward, and at the same time drives the current limiting cover to abut downward against the upper end around the positioning ring body.

2. The elastic pulling type dropper according to claim 1, characterized in that, A flow guiding ring body is provided on the inner side around the upper end of the current limiting cover; the upper end of the flow guiding ring body is located inside the lower end of the liquid discharge central tube.

3. The elastic pulling type dropper according to claim 1, characterized in that, Upper side rods are provided on both sides of the upper end of the central connecting rod, and the outer ends of the upper side rods are connected to the inner side of the pull ring; lower side rods are provided on both sides of the lower end of the central connecting rod, and the outer ends of the lower side rods are connected to the inner side of the current limiting cover.

4. The elastic pulling type dropper according to claim 1, characterized in that, A sealing pressing ring is provided on the upper end around the positioning ring body; the current limiting cover abuts downward against the sealing pressing ring on the upper end around the positioning ring body.

5. The elastic pulling type dropper according to claim 1, characterized in that, An outward convex docking ring body is provided on the outer side around the lower end of the pull ring; an inward concave annular table surface is provided on the outer side around the upper end of the liquid discharge central tube; the outward convex docking ring body is docked and connected or separated from the inward concave annular table surface.

6. The elastic pulling type dropper according to claim 1, characterized in that, A plurality of abutting sealing rings are provided on the inner side around the liquid storage tube; the outer sides around the lower end and the outer sides around the middle of the extending ring body abut against the inner sides around the abutting sealing rings.

7. The elastic pulling type dropper according to claim 1, characterized in that, The longitudinal section of the liquid storage tube is in a U-shaped structure.

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