Burette dredging needle

Abstract

A burette dredging needle comprises a needle rod and a handle. The needle rod is in a slender cylinder shape and is provided with a plurality of transverse through holes. The longitudinal axis of the hole is vertically intersected with the longitudinal axis of the needle rod, and the long axis of the ellipse is parallel to the longitudinal axis of the needle rod. The length of the needle rod is 50-80 mm, and the diameter of the needle rod is 0.5-0.8 mm. The length of the short axis of the ellipse is 0.4-0.7 mm, and the length of the long axis of the ellipse is 0.6-1.5 mm. A sharp nozzle of an acid burette is often blocked by vaseline in the use process, and the dredging needle provided by the utility model is used for dredging the burette. The operation method comprises the following steps: filling the burette with water, vertically placing the burette, upwards poking the dredging needle into a drainage pipe from a sharp mouth of the drainage pipe of the burette, opening a cock of the burette, quickly pulling out the dredging needle, and squeezing vaseline blocking the sharp mouth of the burette into a hole of the dredging needle under the dual action of water pressure and downward movement of the dredging needle, so as to realize dredging of the dredging needle. And the dredge needle brings out of the burette.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical laboratory supplies, in particular to a burette unclogging needle. Background Art

[0002] Titration analysis is a commonly used quantitative analysis method that is simple, economical and accurate. It is of great significance in the fields of industry, agriculture, environmental protection, medicine and health.

[0003] Acid burettes are used to hold acidic and oxidizing solutions, while alkaline burettes are used to hold alkaline solutions. Acid burettes have a wider range of applications than alkaline burettes. While PTFE acid burettes have found some use today, traditional all-glass acid burettes are still widely used due to their low price.

[0004] Before using an all-glass acid burette, apply petroleum jelly (oil) between the burette stopper and sleeve to ensure smooth rotation and a watertight seal. Excessive or improper oiling can often cause the petroleum jelly to clog the tip of the burette drain tube, preventing the solution from flowing out. This common problem for beginners, who lack experience, is that petroleum jelly clogs their burettes.

[0005] The general method for dealing with the tip of the burette being blocked by vaseline is:

[0006] (1) Dredging with thin wire

[0007] This method is commonly used in most laboratories. A thin wire is inserted through the drainpipe nozzle into a burette. The wire dislodges the petroleum jelly blocking the nozzle, allowing the petroleum jelly to move away from the nozzle and into the drainpipe, allowing the solution in the burette to flow out. However, under the pressure of the solution in the burette, the petroleum jelly will move downward again, re-blocking the nozzle. Therefore, using a thin wire to unclog a drainpipe is rarely effective the first time. It requires repeated insertion and removal of the wire, allowing a thin layer of petroleum jelly to adhere to the wire each time, to slowly remove the petroleum jelly from the drainpipe.

[0008] (2) Soak in hot water

[0009] Dip the drainpipe tip in hot water to soften the vaseline. The pressure from the solution in the burette forces the softened vaseline out of the burette. This method requires hot water to be prepared in advance. Furthermore, when dipping the tip, the stopcock can be accidentally soaked in hot water, causing the vaseline to drain away and causing the burette to leak. Re-oiling the burette is then necessary.

[0010] (3) Press out the ear cleaning ball

[0011] Use an ear bulb to apply pressure to the top of the burette to force the Vaseline out through the tip. Alternatively, fill the burette with water and use the pressure of the water column to force the Vaseline out. These two methods are only suitable for minor blockages. If the blockage is severe or in winter when the Vaseline is hard, it will be difficult to unclog the burette.

[0012] (4) Dissolved in organic solvents such as ether, petroleum ether and chloroform

[0013] Drip an organic solvent such as ether, petroleum ether, or chloroform into the burette. Once the organic solvent fills the drain nozzle, close the stopcock and let it sit for 10 to 20 minutes to allow the organic solvent to slowly dissolve the petroleum jelly. Once the petroleum jelly is completely dissolved, drain the burette. Because organic solvents are toxic, flammable, and explosive, dissolving the petroleum jelly with organic solvents is not a good option. Furthermore, because the contact surface between the organic solvent and the petroleum jelly is small and stirring is not possible to aid dissolution, this method takes a long time. Furthermore, the organic solvent may dissolve the petroleum jelly applied to the stopcock, causing the burette to leak.

[0014] Therefore, we still need a simple, fast, environmentally friendly and effective method for unclogging the burette. Utility Model Content

[0015] In order to solve the problem of unclogging the tip of the existing burette drainage pipe after it is blocked, the utility model provides a burette unclogging needle to achieve the purpose of quickly and effectively unclogging the burette blocked by vaseline.

[0016] The technical solution adopted in this utility model is:

[0017] A burette unclogging needle comprises a needle rod and a handle. The needle rod is in the shape of an elongated cylinder and is provided with a plurality of transversely penetrating holes.

[0018] Furthermore, the cross section of the hole is elliptical, the longitudinal axis of the hole intersects the longitudinal axis of the needle rod at right angles, and the major axis of the ellipse is parallel to the longitudinal axis of the needle rod.

[0019] Furthermore, the needle rod has a length of 50-80 mm and a diameter of 0.5-0.8 mm.

[0020] Furthermore, the length of the elliptical minor axis of the cross section of the hole is 0.4-0.7 mm, and the length of the elliptical major axis is 0.6-1.5 mm.

[0021] Furthermore, the top end of the needle rod is a flat surface or a curved surface.

[0022] Furthermore, the shapes of the handle include ring, C-shape, rod-shape and spherical shape.

[0023] Furthermore, the needle rod is made of metal.

[0024] The burette unclogging needle proposed in the utility model has a plurality of holes extending through the needle shaft. When the unclogging needle is pulled out of the burette drain pipe, the vaseline in the drain pipe is squeezed into the holes under the dual effects of water pressure and the downward movement of the unclogging needle, and is then carried out of the burette by the unclogging needle. After the unclogging needle is pulled out, the vaseline on the unclogging needle is wiped off with paper or cloth, completing the unclogging work. The unclogging work is characterized by being fast and effective. If the vaseline in the burette is relatively small, the vaseline can be cleaned out in one go. If the amount of vaseline is relatively large, the above operation can be repeated several times, generally 2-3 times, to completely remove the vaseline.

[0025] Because the diameter of the dredging needle is small, the hole is designed to have an elliptical cylindrical shape to expand its volume and allow more vaseline to enter and be removed. Specifically, the hole has an elliptical cross-section, with the longitudinal axis of the hole perpendicular to the longitudinal axis of the needle shaft, and the long axis of the ellipse parallel to the longitudinal axis of the needle shaft. This elliptical cylindrical shape not only increases the volume of each hole, enhancing the dredging needle's ability to expel vaseline, but also makes it easier to remove the vaseline from the hole during wiping.

[0026] The needle rod length is 50-80mm. This length is compatible with the length of the burette drain tube. If the needle rod is too short, fewer holes can be set, and the ability to absorb vaseline is limited; if the needle rod is too long, it cannot be fully inserted into the burette drain tube, and the vaseline cannot be discharged.

[0027] The needle rod diameter is 0.5-0.8mm. This diameter is slightly smaller than the inner diameter of the tip of a typical burette, allowing the needle rod to be easily inserted from the tip into the drain pipe of the burette.

[0028] The short axis of the ellipse is 0.4-0.7mm, slightly smaller than the diameter of the needle rod, and the long axis of the ellipse is 0.6-1.5mm. This hole size can ensure that the needle rod has a certain strength and can also make the hole have a larger volume.

[0029] The top of the needle bar is flat or curved, which makes it less likely for the needle bar to injure people and is safer during use and storage.

[0030] The handles are available in various shapes, including ring, C, rod, and spherical. These handles facilitate gripping the needle, making it easier to operate and increase the overall size of the needle, making it less likely to be lost. The ring and C-shaped handles also make it easier to hang the needle on a hook for storage.

[0031] The needle bar is made of metal, which has appropriate strength and is suitable for making the needle bar.

[0032] The beneficial effects of the present invention are as follows:

[0033] (1) The burette unclogging needle can quickly and easily remove the vaseline that blocks the tip of the burette. Insert the unclogging needle from the tip of the drainpipe into the burette filled with water, and then quickly pull it out to complete the unclogging work.

[0034] (2) The dredging needle has a simple structure, is easy to make, and has a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the burette dredging needle of the utility model.

[0036] Figure 2 It is a schematic diagram of the hole structure of the burette dredging needle of the utility model.

[0037] In the figure: 1 - needle bar, 2 - handle, 3 - hole, 4 - longitudinal axis of the hole, 5 - longitudinal axis of the needle bar, 6 - major axis of the ellipse, 7 - minor axis of the ellipse. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0039] The embodiments described in this specification are merely examples of implementations of the invention, and the scope of protection of the present invention should not be considered limited to the specific forms described in the embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the concept of the present invention.

[0040] Example 1

[0041] (1) Unclogging needle

[0042] A burette unclogging needle comprises a needle rod 1 and a handle 2. The needle rod 1 is in the shape of an elongated cylinder and is provided with a plurality of transversely penetrating holes 3.

[0043] Furthermore, the cross section of the hole 3 is elliptical, the longitudinal axis 4 of the hole intersects the longitudinal axis 5 of the needle rod at right angles, and the major axis 6 of the ellipse is parallel to the longitudinal axis 5 of the needle rod.

[0044] Furthermore, the needle rod 1 has a length of 50 mm and a diameter of 0.5 mm.

[0045] Furthermore, the length of the elliptical minor axis 7 of the cross section of the hole is 0.4 mm, and the length of the elliptical major axis 6 is 0.6 mm.

[0046] Furthermore, the top end of the needle rod 1 is a plane.

[0047] Furthermore, the handle 2 is in the shape of a ring.

[0048] Furthermore, the needle rod 1 is made of metal.

[0049] (2) Dredging operation

[0050] Fill the burette with water, place it upright, and insert the dredging needle upward through the tip of the burette drain pipe into the drain pipe. At this time, the vaseline blocking the tip will be inserted into the drain pipe. Open the burette stopcock and quickly pull out the dredging needle. At this time, the vaseline will be squeezed into the dredging needle hole 3 under the combined effect of water pressure and the downward movement of the dredging needle, and will be carried out of the burette by the dredging needle. After removing the dredging needle, wipe off the vaseline in the dredging needle hole 3 with paper.

[0051] Example 2

[0052] (1) Unclogging needle

[0053] A burette unclogging needle comprises a needle rod 1 and a handle 2. The needle rod 1 is in the shape of an elongated cylinder and is provided with a plurality of transversely penetrating holes 3.

[0054] Furthermore, the cross section of the hole 3 is elliptical, the longitudinal axis 4 of the hole intersects the longitudinal axis 5 of the needle rod at right angles, and the major axis 6 of the ellipse is parallel to the longitudinal axis 5 of the needle rod.

[0055] Furthermore, the needle rod 1 has a length of 60 mm and a diameter of 0.6 mm.

[0056] Furthermore, the length of the elliptical minor axis 7 of the cross section of the hole is 0.5 mm, and the length of the elliptical major axis 6 is 0.8 mm.

[0057] Furthermore, the top end of the needle rod 1 is a plane.

[0058] Furthermore, the handle 2 is C-shaped.

[0059] Furthermore, the needle rod 1 is made of metal.

[0060] (2) Dredging operation

[0061] The dredging operation is the same as in Example 1.

[0062] Example 3

[0063] (1) Unclogging needle

[0064] A burette unclogging needle comprises a needle rod 1 and a handle 2. The needle rod 1 is in the shape of an elongated cylinder and is provided with a plurality of transversely penetrating holes 3.

[0065] Furthermore, the cross section of the hole 3 is elliptical, the longitudinal axis 4 of the hole is perpendicular to the longitudinal axis 5 of the needle rod, and the major axis 6 of the ellipse is parallel to the longitudinal axis 5 of the needle rod.

[0066] Furthermore, the needle rod 1 has a length of 70 mm and a diameter of 0.7 mm.

[0067] Furthermore, the length of the elliptical minor axis 7 of the cross section of the hole is 0.6 mm, and the length of the elliptical major axis 6 is 1.2 mm.

[0068] Furthermore, the top end of the needle rod 1 is a curved surface.

[0069] Furthermore, the handle 2 is in the shape of a rod.

[0070] Furthermore, the needle rod 1 is made of metal.

[0071] (2) Dredging operation

[0072] Fill the burette with water, place it upright, and insert the dredging needle upward through the tip of the burette drain pipe into the drain pipe. At this time, the vaseline blocking the tip will be pushed into the drain pipe. Open the burette stopcock and quickly pull out the dredging needle. At this time, the vaseline will be squeezed into the dredging needle hole 3 under the combined effect of water pressure and the downward movement of the dredging needle, and will be carried out of the burette by the dredging needle. After removing the dredging needle, wipe off the vaseline in the dredging needle hole 3 with a cloth.

[0073] If there is a lot of Vaseline in the tube, repeat the above operation several times until all the Vaseline in the burette is removed.

[0074] Example 4

[0075] (1) Unclogging needle

[0076] A burette unclogging needle comprises a needle rod 1 and a handle 2. The needle rod 1 is in the shape of an elongated cylinder and is provided with a plurality of transversely penetrating holes 3.

[0077] Furthermore, the cross section of the hole 3 is elliptical, the longitudinal axis 4 of the hole intersects the longitudinal axis 5 of the needle rod at right angles, and the major axis 6 of the ellipse is parallel to the longitudinal axis 5 of the needle rod.

[0078] Furthermore, the needle rod 1 has a length of 80 mm and a diameter of 0.8 mm.

[0079] Furthermore, the length of the elliptical minor axis 7 of the cross section of the hole is 0.7 mm, and the length of the elliptical major axis 6 is 1.4 mm.

[0080] Furthermore, the top end of the needle rod 1 is a curved surface.

[0081] Furthermore, the handle 2 is spherical in shape.

[0082] Furthermore, the needle rod 1 is made of metal.

[0083] (2) Dredging operation

[0084] The dredging operation is the same as in Example 3.

Claims

1. A burette unclogging needle, comprising a needle shaft (1) and a handle (2), characterized in that: The needle rod (1) is in the shape of an elongated cylinder and is provided with a plurality of transversely penetrating holes (3).

2. The burette dredging needle according to claim 1, characterized in that: The cross section of the hole (3) is elliptical, the longitudinal axis (4) of the hole intersects the longitudinal axis (5) of the needle rod at right angles, and the major axis (6) of the ellipse is parallel to the longitudinal axis (5) of the needle rod.

3. The burette dredging needle according to claim 1, characterized in that: The needle rod (1) has a length of 50-80 mm and a diameter of 0.5-0.8 mm.

4. The burette dredging needle according to claim 2, characterized in that: The length of the elliptical minor axis (7) of the cross section of the hole (3) is 0.4-0.7 mm, and the length of the elliptical major axis (6) is 0.6-1.5 mm.

5. The burette dredging needle according to claim 1, characterized in that: The top end of the needle rod (1) is a flat surface or a curved surface.

6. The burette dredging needle according to claim 1, characterized in that: The shapes of the handle (2) include ring, C, rod and spherical.

7. The burette dredging needle according to claim 1, 2, 3, 4 or 5, characterized in that: The needle rod (1) is made of metal.

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