A droplet size switchable glue tip dropper

Abstract

The application discloses a glue head dropper with switchable liquid drop size, which is provided with a rubber air bag at one end and a tapered end at the other end, and is provided with a connecting pipe at the middle part of the outer tapered end, wherein the tapered end port is located in the connecting pipe and is provided with a tapered pipe on the tapered end port, a funnel-shaped pipe is fixed in the connecting pipe through a connecting rod, the center lines of the dropper, the connecting pipe, the tapered pipe and the funnel-shaped pipe are coincident, a tapered cover with a small end downward is arranged on the upper port of the funnel-shaped pipe, a liquid leakage hole is formed in the center of the tapered cover, a certain width gap is left between the tapered pipe and the tapered cover, and the inner cavity of the funnel-shaped pipe is composed of an upper cylindrical cavity and a lower cylindrical cavity which are connected into one body. The application can realize the drop addition of small liquid drops and can also realize the drop addition of conventional large liquid drops by using a slow liquid suction mode. The application has the advantages of simple structure, simple operation and low cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of laboratory instruments, and particularly relates to a glue head dropper with switchable droplet size. BACKGROUND

[0002] The glue head dropper is also called glue cap dropper, which is simple in structure and mainly used for transferring and adding small amount of liquid. Generally, the existing glue head dropper has single droplet size in use, and 20 drops are about 1 milliliter. In the actual application process, the glue head dropper may face the problem of needing to reduce the volume of single droplet for micro-dropping, and may also need to cooperate with multiple size droplets to complete dropping. The outlet pipe diameter of the glue head dropper determines the size of the droplet, and a single conventional glue head dropper is difficult to realize the switching of droplets of different sizes. The conventional way is to change the size of the droplet by selecting a dropper with different pipe diameters, which increases the operation steps and reduces the experimental efficiency. At present, there is an urgent need for a glue head dropper which can realize the switching of droplets of different sizes without replacing the dropper. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the shortcomings of the existing glue head dropper, and to provide a glue head dropper with switchable droplet size, which is simple in structure, convenient to operate and low in cost.

[0004] The technical scheme adopted to solve the above technical problem is as follows: a glue head dropper with switchable droplet size, one end of the dropper is provided with an air bag made of rubber, and the other end is a conical end, a connecting pipe and a conical pipe are connected to the conical end port of the dropper, the conical pipe is located in the connecting pipe, a funnel-shaped pipe is fixed below the conical pipe in the connecting pipe through a connecting rod, the center lines of the dropper, the connecting pipe, the conical pipe and the funnel-shaped pipe coincide, the inner diameter of the conical end port of the dropper = the inner diameter of the large end port of the conical pipe = the inner diameter of the connecting pipe, a conical cover with a small end downward is arranged on the upper end port of the funnel-shaped pipe, the conical cover is integrated with the funnel-shaped pipe, a leakage hole is processed in the center of the conical cover, a certain width gap is left between the conical pipe and the conical cover, the inner cavity of the funnel-shaped pipe is composed of an upper cylindrical cavity and a lower cylindrical cavity, the diameter of the upper cylindrical cavity > the inner diameter of the small end port of the conical pipe > the diameter of the leakage hole > the diameter of the lower cylindrical cavity, and the diameter of the upper cylindrical cavity = the inner diameter of the large end port of the conical cover.

[0005] As a preferred technical scheme, the inner diameter of the small end port of the conical pipe is 1 / 3 to 1 / 2 times the inner diameter of the large end port, and the taper is 30° to 60°.

[0006] As a preferred technical scheme, the diameter of the leakage hole is 1 / 5 to 1 / 4 times the inner diameter of the connecting pipe.

[0007] As a preferred technical scheme, the diameter of the upper cylindrical cavity is 2 / 3 to 4 / 5 times the inner diameter of the connecting pipe, and the length is 20 to 30 mm.

[0008] As a preferred technical scheme, the diameter of the lower cylindrical cavity is 1 / 6-1 / 4 times of the inner diameter of the connecting pipe, and the length is 20-30 mm.

[0009] As a preferred technical scheme, the gap width between the conical pipe and the conical cover is 2-4 mm.

[0010] The beneficial effects of the present application are as follows:

[0011] 1. The funnel-shaped pipe is arranged in the connecting pipe, the liquid suction rate is adjusted, a hollow is formed in the funnel-shaped pipe, the hollow can effectively prevent the liquid in the funnel-shaped pipe from rising, the liquid in the funnel-shaped pipe is discharged first when the air bag is squeezed, and the micro liquid drop discharge is realized. The funnel-shaped pipe can be filled with liquid by slowly sucking liquid, and no hollow is formed, the liquid drops are discharged from the funnel-shaped pipe and the annular cavity when the air bag is squeezed, and the conventional large liquid drop discharge is realized. The large and small liquid drop discharges can be realized by a single dropper.

[0012] 2. The connecting pipe has no flow dead zone, and is convenient to clean.

[0013] 3. The present application has the advantages of simple structure, easy operation and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the liquid drop size switchable glue head dropper of the present application.

[0015] Figure 2 is Figure 1 a partial enlarged view of A in the middle.

[0016] Wherein: the air bag 1, the dropper 2, the funnel-shaped pipe 3, the connecting pipe 4, the connecting rod 5, the conical pipe 6, the conical cover 7, the upper cylindrical cavity a, the lower cylindrical cavity b, the annular cavity c, the liquid leakage hole d. DETAILED DESCRIPTION

[0017] The present application will be further described in detail below in combination with the drawings and examples, but the present application is not limited to the following embodiments.

[0018] In Figure 1 , 2In the embodiment, the liquid droplet size switchable rubber head dropper is composed of an air bag 1, a dropper 2, a funnel-shaped tube 3, a connecting tube 4, a connecting rod 5 and a tapered tube 6. The dropper 2 is provided with the air bag 1 at one end and a tapered end at the other end, and the dropper 2 is integrated with the air bag 1. The material of the air bag 1 is rubber. The tapered end of the dropper 2 is connected with the connecting tube 4 and the tapered tube 6. The tapered tube 6 is located in the connecting tube 4. The funnel-shaped tube 3 is fixed in the connecting tube 4 through the connecting rod 5. An annular cavity c is formed between the funnel-shaped tube 3 and the connecting tube 4. The center lines of the dropper 2, the connecting tube 4, the tapered tube 6 and the funnel-shaped tube 3 coincide. The inner diameter of the tapered end of the dropper 2 is equal to the inner diameter of the large end of the tapered tube 6 and the inner diameter of the connecting tube 4. The inner cavity of the funnel-shaped tube 3 is composed of an upper cylindrical cavity a and a lower cylindrical cavity b. A tapered cap 7 with a small end downward is arranged on the upper end of the funnel-shaped tube 3. The inner diameter of the large end of the tapered cap 7 is equal to the diameter of the upper cylindrical cavity a. The funnel-shaped tube 3 is integrated with the tapered cap 7. A liquid leakage hole d is processed in the center of the tapered cap 7. A gap with a width of 4 mm is left between the tapered tube 6 and the tapered cap 7. The annular cavity c formed between the funnel-shaped tube 3 and the connecting tube 4 is connected with the inner cavity of the funnel-shaped tube 3 through the gap between the tapered tube 6 and the tapered cap 7. The diameter of the upper cylindrical cavity is greater than the inner diameter of the small end of the tapered tube, the diameter of the liquid leakage hole, and the diameter of the lower cylindrical cavity.

[0019] In the embodiment, the inner diameter of the small end of the tapered tube 6 is 5 / 12 times of the inner diameter of the large end. The taper is 45°. The diameter of the upper cylindrical cavity a is 11 / 15 times of the inner diameter of the connecting tube 4, and the length is 25 mm. The diameter of the lower cylindrical cavity b is 5 / 24 times of the inner diameter of the connecting tube 4, and the length is 25 mm. The diameter of the liquid leakage hole d is 9 / 40 times of the inner diameter of the connecting tube 4.

[0020] The working principle of the present application is as follows:

[0021] (1) Squeeze the air bag 1 to discharge the air in the dropper 2. Insert the connecting tube 4 below the liquid surface to be taken. Loosen part of the air bag 1. Slowly suck the liquid until the liquid surface reaches the upper end of the lower cylindrical cavity b of the funnel-shaped tube 3. Then suck the liquid at a faster speed. Since the cross-sectional area of the annular gap between the upper cylindrical cavity a of the funnel-shaped tube 3 and the connecting tube 4 is smaller than the cross-sectional area of the annular gap between the lower cylindrical cavity b and the connecting tube 4, the liquid level of the annular gap between the upper cylindrical cavity a of the funnel-shaped tube 3 and the connecting tube 4 rises faster. At the same time, the cross-sectional area of the upper cylindrical cavity a is larger than that of the lower cylindrical cavity b, and the liquid level of the upper cylindrical cavity a rises slower. When liquid appears in the small end of the tapered tube 6, stop sucking liquid. At this time, the upper cylindrical cavity a of the funnel-shaped tube contains air, and the lower cylindrical cavity b is filled with liquid.

[0022] (2) The invention is moved out of the liquid surface, and the air bag 1 is continuously loosened. The liquid in the annular space between the funnel-shaped tube 3 and the connecting tube 4 rises into the dropper 2. When the upper end of the liquid in the annular space between the funnel-shaped tube 3 and the connecting tube 4 rises to the upper end of the funnel-shaped tube 3, the process is stopped. At this time, because there is air in the upper part of the cylindrical cavity a, the liquid in the lower part does not rise.

[0023] (3) The invention is moved to above the liquid to be added, and the position is adjusted so that the dropper 2 is vertical. The air bag is squeezed. The liquid in the lower cylindrical cavity b of the funnel-shaped tube 3 moves downward first and flows out from the lower port, forming tiny droplets. At the same time, the liquid surface in the annular space between the funnel-shaped tube 3 and the connecting tube 4 moves downward, gradually filling the annular space. The squeezing of the air bag 1 is stopped, and the liquid no longer flows out of the funnel-shaped tube 3. The flow rate is controlled by adjusting the squeezing rate.

[0024] The invention is provided with a funnel-shaped tube 3 in the connecting tube 4. By adjusting the liquid suction rate, a hollow is formed in the funnel-shaped tube 3, which can effectively prevent the liquid in the funnel-shaped tube 3 from rising. When the air bag 1 is squeezed, the liquid in the funnel-shaped tube 3 is discharged first, realizing the discharge of tiny droplets. By slowly sucking liquid, the funnel-shaped tube 3 is filled with liquid, and no hollow is formed. When the liquid is added by squeezing the air bag 1, the droplets are discharged from the funnel-shaped tube 3 and the annular cavity at the same time, realizing the discharge of conventional large droplets. A single dropper can realize the discharge of large and small droplets, which is simple to operate.

[0025] Example 2

[0026] In this embodiment, one end of the dropper 2 is provided with an air bag 1, and the other end is a tapered end. The dropper 2 and the air bag 1 are integrated. The material of the air bag 1 is rubber. The outer middle part of the tapered end of the dropper is provided with a connecting tube 4. The tapered end port of the dropper is located in the connecting tube 4, and a tapered tube is provided on the tapered end port. A funnel-shaped tube 3 is fixed in the connecting tube 4 by a connecting rod 5. An annular cavity c is formed between the funnel-shaped tube 3 and the connecting tube 4. The center lines of the dropper, the connecting tube 4, the tapered tube, and the funnel-shaped tube 3 coincide. The inner diameter of the tapered end port of the dropper = the inner diameter of the large end port of the tapered tube = the inner diameter of the connecting tube 4. The inner diameter of the small end port of the tapered tube 6 is 1 / 3 times the inner diameter of the large end port, and the taper is 30°. The inner cavity of the funnel-shaped tube 3 is composed of an upper cylindrical cavity a and a lower cylindrical cavity b. The diameter of the upper cylindrical cavity a is 2 / 3 times the inner diameter of the connecting tube 4, and the length is 20 mm. The diameter of the lower cylindrical cavity b is 1 / 6 times the inner diameter of the connecting tube 4, and the length is 20 mm. A small end downward tapered cover 7 is provided on the upper end port of the funnel-shaped tube 3. The inner diameter of the large end port of the tapered cover 7 = the diameter of the upper cylindrical cavity a. The funnel-shaped tube 3 and the tapered cover 7 are integrated. A liquid leakage hole d is processed in the center of the tapered cover 7. The diameter of the liquid leakage hole d is 1 / 5 times the inner diameter of the connecting tube 4. A gap with a width of 3 mm is left between the tapered tube 6 and the tapered cover 7. The annular cavity c between the funnel-shaped tube 3 and the connecting tube 4 is connected with the inner cavity of the funnel-shaped tube 3 through the gap between the tapered tube and the tapered cover 7.

[0027] Embodiment 3

[0028] In this embodiment, one end of the dropper 2 is provided with the air bag 1, the other end is a tapered end, the dropper 2 is integrated with the air bag 1, the material of the air bag 1 is rubber, the outer middle part of the tapered end of the dropper 2 is provided with the connecting pipe 4, the tapered end port of the dropper 2 is located in the connecting pipe 4 and is provided with a tapered pipe on the tapered end port, the funnel-shaped pipe 3 is fixed in the connecting pipe 4 through the connecting rod 5, the annular cavity c is formed between the funnel-shaped pipe 3 and the connecting pipe 4, the center lines of the dropper, the connecting pipe 4, the tapered pipe and the funnel-shaped pipe 3 coincide, the inner diameter of the tapered end port of the dropper = the inner diameter of the large end port of the tapered pipe = the inner diameter of the connecting pipe 4, the inner diameter of the small end port of the tapered pipe 6 is 1 / 2 times of the inner diameter of the large end port, the taper is 60°, the inner cavity of the funnel-shaped pipe 3 is composed of the upper cylindrical cavity a and the lower cylindrical cavity b, the diameter of the upper cylindrical cavity a is 4 / 5 times of the inner diameter of the connecting pipe 4, the length is 30mm, the diameter of the lower cylindrical cavity b is 1 / 4 times of the inner diameter of the connecting pipe 4, the length is 30mm, the small end downward tapered cover 7 is arranged on the upper end port of the funnel-shaped pipe 3, the inner diameter of the large end port of the tapered cover 7 = the diameter of the upper cylindrical cavity a, the funnel-shaped pipe 3 is integrated with the tapered cover 7, the center of the tapered cover 7 is processed with the liquid leakage hole d, the hole diameter of the liquid leakage hole d is 3 / 8 times of the inner diameter of the connecting pipe 4, the gap with a width of 2mm is left between the tapered pipe 6 and the tapered cover 7, the annular cavity c formed between the funnel-shaped pipe 3 and the connecting pipe 4 is connected with the inner cavity of the funnel-shaped pipe 3 through the gap between the tapered pipe and the tapered cover 7.

Claims

1. A liquid droplet size switchable rubber tipped dropper, the dropper having one end provided with a rubber air bag and the other end being a tapered end, characterized in that: The taper port of the dropper is connected with a connecting tube and a taper tube, the taper tube is located in the connecting tube, a funnel-shaped tube is fixed below the taper tube in the connecting tube by a connecting rod, the center lines of the dropper, the connecting tube, the taper tube and the funnel-shaped tube coincide, the inner diameter of the taper port of the dropper = the inner diameter of the large port of the taper tube = the inner diameter of the connecting tube, a taper cover with a small end downward is arranged on the upper port of the funnel-shaped tube, the taper cover is integrated with the funnel-shaped tube, a liquid leakage hole is processed in the center of the taper cover, a certain width gap is left between the taper tube and the taper cover, the inner cavity of the funnel-shaped tube is composed of an upper cylindrical cavity and a lower cylindrical cavity, the diameter of the upper cylindrical cavity > the inner diameter of the small port of the taper tube > the diameter of the liquid leakage hole > the diameter of the lower cylindrical cavity, and the diameter of the upper cylindrical cavity = the inner diameter of the large port of the taper cover.

2. The liquid droplet size switchable glue-tipped dropper according to claim 1, wherein: The inner diameter of the small port of the taper tube is 1 / 3-1 / 2 times of the inner diameter of the large port, and the taper is 30-60°.

3. The liquid droplet size switchable glue-tipped dropper of claim 1, wherein: The diameter of the liquid leakage hole is 1 / 5-1 / 4 times of the inner diameter of the connecting tube.

4. The liquid droplet size switchable glue-tipped dropper of claim 1, wherein: The diameter of the upper cylindrical cavity is 2 / 3-4 / 5 times of the inner diameter of the connecting tube, and the length is 20-30 mm.

5. The liquid droplet size switchable glue-tipped dropper of claim 1, wherein: The diameter of the lower cylindrical cavity is 1 / 6-1 / 4 times of the inner diameter of the connecting tube, and the length is 20-30 mm.

6. The liquid droplet size switchable glue-tipped dropper of claim 1, wherein: The gap width between the taper tube and the taper cover is 2-4 mm.

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