Burette

Abstract

The utility model relates to a burette. The burette comprises a burette main body, a cock switch and a limiting structure, the burette main body comprises a matching part; the cock switch part is installed in the matching part, and the cock switch is provided with a groove. The limiting structure comprises a limiting piece and a fixing piece, the limiting piece is matched with the groove, and the limiting piece is arranged in the fixing piece. According to the technical scheme, the problem that the cock switch and the burette main body are not tightly matched in the prior art is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of experimental tools, and in particular to a burette. Background Art

[0002] A burette is a measuring vessel used to hold the titrant solution during the titration operation. The burette is a long, thin tubular container with a stopcock switch at one end and a scale indicating the measurement. There are two types of burettes: one is an acid burette and the other is an alkaline burette. The acid burette has a glass piston on its pointed glass tube, which can be loaded with acidic or oxidizing titrants, but not alkaline titrants, because alkaline titrants can cause the piston to adhere to the piston sleeve and make it difficult to rotate. The alkaline burette is used to hold alkaline solutions. The lower end of the tube is connected to a rubber tube, and glass beads are placed in the rubber tube to control the outflow of the solution. The lower end of the rubber tube is connected to a pointed glass tube. Any solution that can react with the rubber tube, such as potassium permanganate, iodine and other solutions, cannot be loaded into the alkaline burette.

[0003] The burette in the prior art (for example, the authorization announcement number is CN209198409U, and the name is: an acid burette) includes a glass tube body and a stopcock switch, and the stopcock switch is arranged through the glass tube body. The flow of the titrant solution can be controlled by rotating the stopcock switch. However, since the connection between the burette body and the stopcock switch is not tight enough, the titrant solution of this burette is easy to overflow from the connection between the glass tube body and the stopcock switch, which brings a safety hazard to the operator for the highly corrosive titrant solution. Utility Model Content

[0004] The present application provides a burette to solve the problem in the prior art that the stopcock switch and the burette body are not tightly matched.

[0005] A burette provided by the present application includes: a burette body, a cock switch and a limit structure. The burette body includes a matching portion. The cock switch is partially installed in the matching portion, and the cock switch has a groove. The limit structure includes a limit member and a fixing member, the limit member matches the groove, and the limit member is arranged in the fixing member.

[0006] In some embodiments, the fixing member is a hollow frustum, a first end of the fixing member has an annular plate, and a second end of the fixing member has a circular opening.

[0007] In some embodiments, the limiter is a circular ring with thickness, the limiter is arranged in the fixing member, the limiter and the annular plate abut against each other, the inner diameter of the limiter is smaller than the inner diameter of the annular plate, and the outer diameter of the limiter is smaller than or equal to the outer diameter of the annular plate.

[0008] In some embodiments, the thickness of the limiting member is equal to the width of the groove, the limiting member is an elastic member, and the inner diameter of the limiting member can be changed.

[0009] In some embodiments, the limiting member is detachably disposed in the fixing member, and the limiting member is made of polytetrafluoroethylene material or rubber material.

[0010] In some embodiments, the cock switch includes a frustum segment and a rotating handle, the rotating handle is connected to the frustum segment, a groove is circumferentially arranged on the frustum segment, and the groove divides the frustum segment into a first frustum segment and a second frustum segment.

[0011] In some embodiments, the second truncated cone segment is located inside the mating portion, the side wall of the second truncated cone segment fits the inner wall of the mating portion, the first truncated cone segment and the groove are located on the left side outside the mating portion, and the rotating handle is located on the right side outside the mating portion.

[0012] In some embodiments, the burette body further includes a tube portion, which is connected to the matching portion. The tube portion divides the matching portion into a first matching portion and a second matching portion, and the inner wall of the fixing member fits the outer wall of the first matching portion.

[0013] In some embodiments, the second truncated cone segment has a connecting channel, and the connecting channel is connected to the tube portion.

[0014] In some embodiments, scale markings are provided on the tube.

[0015] According to the technical solution of the present application, the burette body includes a matching part, the stopcock switch is at least partially installed in the matching part, the burette body is filled with a solution, the stopcock switch can control the circulation of the solution, the stopcock switch has a groove, and the limiting structure includes a limiting member and a fixing member, the limiting member and the groove cooperate to limit the stopcock switch, and at the same time can prevent the corrosive solution from overflowing from the position where the stopcock switch is connected to the matching part, the limiting member is arranged in the fixing member, and the fixing member can strengthen the matching effect of the limiting member and the groove, so that the stopcock switch and the burette body are closely matched, and at the same time play a role in limiting the limiting member. The technical solution of the present application effectively solves the problem of the stopcock switch and the burette body not being closely matched in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 The schematic diagram of the structure of the burette of the first embodiment of the present application is shown;

[0019] Figure 2 A schematic structural diagram of a fixing member according to a first embodiment of the present application is shown;

[0020] Figure 3 A schematic structural diagram of a position limiting member according to Embodiment 1 of the present application is shown;

[0021] Figure 4 A schematic diagram of the structure of the groove of the second embodiment of the present application is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. burette body; 11. fitting part; 12. tube part; 20. cock switch; 21. truncated cone section; 211. groove; 212. first truncated cone section; 213. second truncated cone section; 2131. connecting channel; 22. rotating handle; 30. limiting structure; 31. limiting member; 32. fixing member. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0027] like Figure 1As shown, the first embodiment relates to a burette, comprising: a burette body 10, a cock switch 20 and a limiting structure 30. The burette body 10 comprises a matching portion 11. The cock switch 20 is partially installed in the matching portion 11, and the cock switch 20 has a groove 211. The limiting structure 30 comprises a limiting member 31 and a fixing member 32, the limiting member 31 matches the groove 211, and the limiting member 31 is arranged in the fixing member 32.

[0028] According to the technical solution of the present embodiment, the burette body 10 includes a matching portion 11, the cock switch 20 is partially installed in the matching portion 11, the burette body 10 is filled with a solution, the cock switch 20 can control the circulation of the solution, the cock switch 20 has a groove 211, and the limiting structure 30 includes a limiting member 31 and a fixing member 32. The limiting member 31 and the groove 211 cooperate to limit the cock switch 20, and at the same time, can prevent the corrosive solution from overflowing from the position where the cock switch 20 is connected to the matching portion 11. The limiting member 31 is arranged in the fixing member 32, and the fixing member 32 can strengthen the matching effect of the limiting member 31 and the groove 211, so that the cock switch 20 and the burette body 10 are closely matched, and at the same time, the limiting member 31 is limited. The technical solution of the present embodiment effectively solves the problem of loose matching between the cock switch and the burette body in the prior art.

[0029] like Figure 2 As shown, in the technical solution of the first embodiment, the fixing member 32 is a hollow truncated cone, the first end of the fixing member 32 has an annular plate, and the second end of the fixing member 32 has a circular opening. The fixing member 32 has an accommodating space inside, and the circular opening allows the matching portion 11 to enter the fixing member 32, and the outer wall of the matching portion 11 can fit with the inner wall of the fixing member 32.

[0030] like Figure 3 As shown, in the technical solution of the first embodiment, the limiter 31 is a circular ring with thickness, the limiter 31 is arranged in the fixing member 32, the limiter 31 and the annular plate are pressed against each other, the inner diameter of the limiter 31 is smaller than the inner diameter of the annular plate, and the outer diameter of the limiter 31 is smaller than or equal to the outer diameter of the annular plate. The purpose of this arrangement is that after the limiter 31 is placed in the fixing member 32, the limiter 31 can press against the annular plate, and the annular plate can play a role in limiting the limiter 31. With the cooperation of the fixing member 32 and the plug switch 20, the limiter 31 is fixed.

[0031] In the technical solution of the first embodiment, the thickness of the limit member 31 is equal to the width of the groove 211, and the limit member 31 is an elastic member, and the inner diameter of the limit member 31 can change. The diameter of the fixing member 32 gradually increases from the annular plate to the circular opening, and the diameters of the first truncated cone section 212 and the second truncated cone section 213 of the plug switch 20 increase from left to right. The plug switch 20 is placed into the matching part 11 from the right side of the matching part 11, and the groove 211 and the first truncated cone section 212 of the plug switch 20 are exposed from the left side of the matching part 11. The limit structure 30 is sleeved on the circumferential outer side of the groove 211 and the first truncated cone section 212, so that the outer wall of the first truncated cone section 212 fits with the inner wall of the fixing member 32. The inner diameter of the limit member 31 is smaller than the diameter of the leftmost side of the first truncated cone section 212. Since the limit member 31 is an elastic member, the inner diameter of the limit member 31 can change, so as The limiting structure 30 moves to the right, and the inner diameter of the limiting member 31 increases due to the change in the diameter of the first truncated cone section 212. The thickness of the limiting member 31 is equal to the width of the groove 211. Therefore, as the limiting structure 30 continues to move to the right, the limiting member 31 can be stuck in the groove 211, and the groove 211 can prevent the limiting member 31 from moving left and right. At the same time, since the limiting member 31 is in a stretched state, the limiting member 31 has a force to retract inward (i.e., the inner diameter is reduced), and the limiting member 31 is more difficult to escape from the groove 211. It should be noted that the outer diameter of the limiting member 31 is larger than the leftmost diameter of the matching portion 11, which makes the right side of the limiting member 31 able to abut against the left side of the matching portion after the limiting member 31 is stuck in the groove 211, so the limiting member 31 can prevent the plug switch 20 from detaching from the matching portion 11. After the limiting member 31 and the groove 211 are tightly matched, the fixing member 32 is removed.

[0032] In the technical solution of the first embodiment, the limiter 31 is detachably arranged in the fixing member 32, and the limiter 31 is made of polytetrafluoroethylene or rubber. According to the corrosiveness of the titrant solution, the corresponding limiter 31 can be selected for adaptation. For example, for a highly corrosive titrant solution, the limiter 31 is made of polytetrafluoroethylene, and for a non-corrosive titrant solution, the limiter 31 is made of rubber. In order to facilitate the distinction between whether the titrant solution is acidic, alkaline or neutral, the limiter 31 can be set to different colors. This setting method can facilitate the operator to distinguish between titrant solutions of the same color. The words "acidic", "alkaline" or "neutral" can also be set on the limiter 31, which is more convenient to distinguish the properties of the titrant solution.

[0033] like Figure 1As shown, in the technical solution of the first embodiment, the cock switch 20 includes a truncated cone section 21 and a rotating handle 22, the rotating handle 22 and the truncated cone section 21 are connected, and a groove 211 is circumferentially arranged on the truncated cone section 21, and the groove 211 divides the truncated cone section 21 into a first truncated cone section 212 and a second truncated cone section 213. The cock switch 20 is matched with the matching portion 11, the matching portion 11 is located between the groove 211 and the rotating handle 22, and the second truncated cone section 213 is arranged in the matching portion 11. The groove 211 cooperates with the limiting structure 30 to fix the cock switch 20, and the rotating handle 22 is manually operated to rotate the cock switch 20, thereby realizing the control of the flow of the titrant solution.

[0034] like Figure 1 As shown, in the technical solution of the first embodiment, the second truncated cone section 213 is located in the matching part 11, the side wall of the second truncated cone section 213 is in contact with the inner wall of the matching part 11, the first truncated cone section 212 and the groove 211 are located on the left side of the outside of the matching part 11, and the rotating handle 22 is located on the right side of the outside of the matching part 11. The burette body 10 also includes a tube 12, which is connected to the matching part 11. The tube 12 divides the matching part 11 into a first matching part and a second matching part, and the inner wall of the fixing part 32 is in contact with the outer wall of the first matching part. The distance from the smallest diameter to the largest diameter of the fixing part is smaller than the distance from the smallest diameter to the largest diameter of the first matching part. This arrangement is to avoid the fixing part 32 from colliding with the tube 12 when the fixing part 32 moves to the right on the circumferential outer side of the matching part 11. The lower end of the tube 12 contracts radially inward and extends downward to form a pointed mouth, and the titrant solution flows out from the pointed mouth.

[0035] like Figure 1 As shown, in the technical solution of the first embodiment, the second truncated cone segment 213 has a connecting channel 2131, and the connecting channel 2131 is connected to the tube portion 12. The second truncated cone segment 213 is placed in the matching portion 11, and the connecting channel 2131 is connected to the tube portion 12, at which time the titrant solution can flow, and the second truncated cone segment 213 is driven to rotate by rotating the rotating handle 22 so that the connecting channel 2131 is not connected to the tube portion 12, and the flow of the titrant solution stops.

[0036] like Figure 1 As shown, in the technical solution of the first embodiment, a scale mark is provided on the tube 12. The scale mark facilitates the operator to determine the titration amount during titration, and can accurately replenish the titrant solution.

[0037] like Figure 4As shown, the difference between the technical solution of the second embodiment and the first embodiment is that the diameter of the groove 211 gradually decreases from the outside to the inside, and the thickness of the limiting member 31 gradually increases from the inside to the outside. The purpose of this arrangement is to facilitate the limiting member 31 to enter the groove 211. At the same time, the connection between the groove 211 and the first truncated cone segment 212 is rounded, and the connection between the groove 211 and the second truncated cone segment 213 is rounded to reduce the wear of the limiting member 31 during the cooperation. As the limiting structure 30 moves to the right, the limiting member 31 The inner diameter increases due to the change in the diameter of the first truncated cone section 212. The thickness of the limit member 31 corresponds to the diameter of the groove. The outer wall of the limit member 31 fits with the inner wall of the groove. Therefore, as the limit structure 30 continues to move to the right, the limit member 31 can be stuck in the groove 211. The groove 211 can prevent the limit member 31 from moving left and right. At the same time, since the limit member 31 is in a stretched state, the limit member 31 has a force to retract inward (that is, the inner diameter is reduced), and the limit member 31 is less likely to fall out of the groove 211.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A burette, characterized in that: include: A burette body (10), the burette body (10) comprising a matching portion (11); A plug switch (20), wherein the plug switch (20) is partially installed in the matching portion (11), and the plug switch (20) has a groove (211); A limiting structure (30), the limiting structure (30) comprising a limiting member (31) and a fixing member (32), the limiting member (31) being matched with the groove (211), and the limiting member (31) being arranged in the fixing member (32).

2. The burette according to claim 1, characterized in that The fixing member (32) is a hollow truncated cone, the first end of the fixing member (32) has an annular plate, and the second end of the fixing member (32) has a circular opening.

3. The burette according to claim 2, characterized in that The limiting member (31) is a circular ring with thickness. The limiting member (31) is arranged inside the fixing member (32). The limiting member (31) and the annular plate abut against each other. The inner diameter of the limiting member (31) is smaller than the inner diameter of the annular plate, and the outer diameter of the limiting member (31) is smaller than or equal to the outer diameter of the annular plate.

4. The burette according to claim 3, characterized in that The thickness of the limiting member (31) is equal to the width of the groove (211); the limiting member (31) is an elastic member; and the inner diameter of the limiting member (31) can be changed.

5. The burette according to claim 4, characterized in that The limiting component (31) is detachably arranged in the fixing component (32), and the limiting component (31) is made of polytetrafluoroethylene material or rubber material.

6. The burette according to claim 1, characterized in that The cock switch (20) comprises a truncated cone section (21) and a rotating handle (22), wherein the rotating handle (22) is connected to the truncated cone section (21), and a groove (211) is circumferentially arranged on the truncated cone section (21), wherein the groove (211) divides the truncated cone section (21) into a first truncated cone section (212) and a second truncated cone section (213).

7. The burette according to claim 6, characterized in that The second truncated cone section (213) is located inside the matching portion (11); the side wall of the second truncated cone section (213) is in contact with the inner wall of the matching portion (11); the first truncated cone section (212) and the groove (211) are located on the left side outside the matching portion (11); and the rotating handle (22) is located on the right side outside the matching portion (11).

8. The burette according to claim 7, characterized in that The burette body (10) further comprises a tube portion (12), wherein the tube portion (12) is connected to the matching portion (11), and the tube portion (12) divides the matching portion (11) into a first matching portion and a second matching portion, and the inner wall of the fixing member (32) is in contact with the outer wall of the first matching portion.

9. The burette according to claim 8, characterized in that The second frustum section (213) has a connecting channel (2131), and the connecting channel (2131) is in communication with the tube portion (12).

10. The burette according to claim 9, characterized in that The tube portion (12) is provided with scale markings.

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