Anti-suck-back soft rubber head

Abstract

The utility model discloses an anti-suck-back soft rubber head, and relates to the technical field of droppers. Comprising a corrugated rubber head, the top of the rubber head is connected with a pressing block, the bottom end of the rubber head is connected with an installation block provided with a screw hole, the screw hole formed in the installation block is communicated with an inner cavity of the rubber head, the screw hole of the installation block is in threaded connection with a suction pipe, and a liquid suction hole is formed in the bottom of the suction pipe. The top end of the suction pipe is inserted with a hollow check block which is integrally T-shaped, and through holes communicated with an inner cavity of the check block are formed in the top end and the bottom end of the check block. According to the anti-suck-back soft rubber head, when the pressing force of the rubber head is too large, by arranging the belly head cavity, suck-back liquid can be contained, when the amount of the suck-back liquid is too large and the liquid which cannot be contained in the belly head cavity continues to move upwards, the liquid can be blocked by the check block, the part of liquid can be contained, and the solution is prevented from being sucked back into the rubber head.

Description

Technical Field

[0001] The utility model relates to the technical field of droppers, in particular to an anti-backflow soft rubber head. Background Art

[0002] A dropper is an essential instrument in any laboratory experiment. In laboratory experiments, a rubber-tipped dropper is often used to draw up liquid reagents and medicines. A dropper typically consists of a rubber cap and a glass tube. The glass tube is used to temporarily store the liquid, while the rubber cap is squeezed to create a vacuum and draw up the liquid.

[0003] Existing droppers absorb and squeeze out liquid by squeezing the rubber cap. When the rubber cap is squeezed too hard, the solution is sucked back into the rubber cap, causing contamination and corrosion of the rubber cap, which shortens the service life of the rubber-tipped dropper. Utility Model Content

[0004] The utility model provides an anti-backflow soft rubber head to solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a soft rubber head for preventing backflow, comprising a rubber head, the rubber head being corrugated, the top of the rubber head being connected to a pressing block, the bottom end of the rubber head being connected to a mounting block with a screw hole, the screw hole on the mounting block being connected to the inner cavity of the rubber head, the screw hole of the mounting block being threadedly connected to a straw with a liquid suction hole at the bottom, the upper end of the straw being provided with a spherical belly cavity, the top end of the straw being plugged with a stopper which is T-shaped as a whole and hollow inside, the top and bottom ends of the stopper being provided with through holes connected to its inner cavity.

[0006] Furthermore, the bottom end of the straw is detachably connected to a tube cap.

[0007] Furthermore, a tube cap is inserted into the bottom end of the straw, and a plug which can be inserted into the liquid suction hole is connected to the bottom inner wall of the tube cap.

[0008] Furthermore, one side of the pressing block is fixedly connected to the upper fixed block, one side of the mounting block is fixedly connected to the lower fixed block, the lower fixed block is provided with a vertical rod that movably passes through the upper fixed block, and a spring is provided between the lower fixed block and the upper fixed block and is sleeved on the vertical rod.

[0009] Furthermore, the bottom end of the vertical rod passes through the lower fixing block, and a threaded section is formed on the lower end portion of the vertical rod. The vertical rod is threadedly connected to a nut through the threaded section.

[0010] Furthermore, the outside of the straw is provided with scale lines.

[0011] Furthermore, the upper fixing sleeve of the straw is provided with a sealing gasket that fits with the bottom of the mounting block.

[0012] Compared with the prior art, the present invention provides an anti-backflow soft rubber head with the following beneficial effects:

[0013] 1. The anti-backflow soft rubber tip can accommodate the back-sucked liquid by setting a belly cavity when the pressure on the rubber tip is too large. When the amount of back-sucked liquid is too large and the liquid that cannot be accommodated in the belly cavity continues to move upward, it will be blocked by the block and accommodate this part of the liquid to prevent the solution from being sucked back into the rubber tip.

[0014] 2. The anti-backflow soft rubber head can protect the liquid suction hole of the rubber head by setting a pipe cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of the planar structure of the utility model;

[0017] Figure 3 This is an enlarged schematic diagram of point A of the present utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the straw and the rubber head of the utility model in the separated state.

[0019] In the figure: 1. Pressing block; 2. Rubber head; 3. Mounting block; 4. Straw; 5. Belly cavity; 6. Stopper; 7. Through hole; 8. Pipe cap; 9. Suction hole; 10. Plug; 11. Upper fixing block; 12. Lower fixing block; 13. Vertical pole; 14. Spring; 15. Threaded section; 16. Nut; 17. Scale line; 18. Sealing gasket. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-4The utility model discloses an anti-backflow soft rubber head, including a rubber head 2, the rubber head 2 is corrugated, the top of the rubber head 2 is connected to a pressing block 1, the bottom end of the rubber head 2 is connected to a mounting block 3 with a screw hole, the screw hole provided on the mounting block 3 is connected to the inner cavity of the rubber head 2, the screw hole of the mounting block 3 is threadedly connected to a straw 4 with a liquid suction hole 9 at the bottom, the upper end of the straw 4 is provided with a spherical belly cavity 5, the top end of the straw 4 is inserted with a stopper 6 which is T-shaped as a whole and hollow inside, and the top and bottom ends of the stopper 6 are provided with through holes 7 connected to its inner cavity.

[0022] Specifically, the bottom end of the straw 4 is detachably connected to a pipe cap 8 .

[0023] The bottom end of the pipette 4 is plugged with a pipe cap 8 , and the bottom inner wall of the pipe cap 8 is connected to a plug 10 that can be plugged into the liquid suction hole 9 .

[0024] In this embodiment, a protrusion may be formed at the bottom end of the inner wall of the tube cap 8 , and an annular groove may be formed on the outer wall of the straw 4 into which the protrusion is engaged, so as to improve the tightness of the connection between the tube cap 8 and the straw 4 .

[0025] After the tube cap 8 is inserted into the bottom end of the straw 4 , it can protect the liquid suction hole 9 of the straw 4 .

[0026] Specifically, one side of the pressing block 1 is fixedly connected to the upper fixed block 11, and one side of the mounting block 3 is fixedly connected to the lower fixed block 12. The lower fixed block 12 is provided with a vertical rod 13 that movably passes through the upper fixed block 11. A spring 14 is provided between the lower fixed block 12 and the upper fixed block 11 and is sleeved on the vertical rod 13.

[0027] In this embodiment, the rubber head 2 is corrugated. When the rubber head 2 is pressed by the pressing block 1, the upper fixed block 11 can slide relative to the vertical rod 13 and compress the spring 14. After the pressing block 1 is not pressed, the restoring force of the spring 14 facilitates the restoration of the rubber head 2.

[0028] Specifically, the bottom end of the vertical rod 13 passes through the lower fixing block 12 , and a threaded section 15 is formed at the lower end portion of the vertical rod 13 . The vertical rod 13 is threadedly connected to a nut 16 through the threaded section 15 .

[0029] In this embodiment, the threaded section 15 of the vertical rod 13 passes through the lower fixing block 12 and is threadedly connected to the nut 16 , so that the vertical rod 13 is installed on the lower fixing block 12 .

[0030] Specifically, a scale mark 17 is provided on the outside of the straw 4 .

[0031] In this embodiment, the scale line 17 is provided to facilitate the user to measure the content of the solution in the pipette 4 .

[0032] Specifically, a sealing gasket 18 is fixedly mounted on the straw 4 and is in contact with the bottom of the mounting block 3 .

[0033] In this embodiment, the sealing gasket 18 fits the bottom of the mounting block 3 and can seal the connection between the straw 4 and the mounting block 2 .

[0034] To sum up, the anti-backflow soft rubber head can accommodate the back-sucked liquid by setting the belly head cavity 5 when the pressure of the rubber head 2 is too great. When the amount of back-sucked liquid is too large and the liquid that cannot be accommodated by the belly head cavity 5 continues to move upward, it can be blocked by the block 6 and accommodate this part of the liquid to prevent the solution from being sucked back into the rubber head 2. By setting the tube cap 8, the liquid suction hole 9 of the rubber head 2 can be protected.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft rubber head for preventing backflow, comprising a rubber head (2), characterized in that: The rubber head (2) is corrugated, the top of the rubber head (2) is connected to a pressing block (1), the bottom of the rubber head (2) is connected to a mounting block (3) with a screw hole, the screw hole provided on the mounting block (3) is connected to the inner cavity of the rubber head (2), the screw hole of the mounting block (3) is threadedly connected to a straw (4) with a liquid suction hole (9) provided at the bottom, the upper end of the straw (4) is provided with a spherical belly cavity (5), the top of the straw (4) is plugged with a stopper (6) which is T-shaped as a whole and hollow inside, and the top and bottom of the stopper (6) are both provided with through holes (7) connected to the inner cavity thereof.

2. The anti-backflow soft rubber head according to claim 1, characterized in that: The bottom end of the straw (4) is detachably connected to a pipe cap (8).

3. The anti-backflow soft rubber head according to claim 2, characterized in that: The bottom end of the pipette (4) is plugged with a pipe cap (8), and the bottom inner wall of the pipe cap (8) is connected to a plug (10) that can be plugged into the liquid suction hole (9).

4. The anti-backflow soft rubber head according to claim 1, characterized in that: One side of the pressing block (1) is fixedly connected to the upper fixing block (11), and one side of the mounting block (3) is fixedly connected to the lower fixing block (12). A vertical rod (13) that movably passes through the upper fixing block (11) is mounted on the lower fixing block (12). A spring (14) that is sleeved on the vertical rod (13) is provided between the lower fixing block (12) and the upper fixing block (11).

5. The anti-backflow soft rubber head according to claim 4, characterized in that: The bottom end of the vertical rod (13) passes through the lower fixed block (12), and a threaded section (15) is formed on the lower end portion of the vertical rod (13). The vertical rod (13) is threadedly connected to a nut (16) through its threaded section (15).

6. The anti-backflow soft rubber head according to claim 1, characterized in that: The outside of the straw (4) is provided with scale lines (17).

7. The anti-backflow soft rubber head according to claim 1, characterized in that: The upper fixing sleeve of the straw (4) is provided with a sealing gasket (18) that fits the bottom of the mounting block (3).

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