Burette capable of accurately controlling flow rate

Abstract

In order to solve the problems that a burette is small in adjustment precision of the titration flow rate, inconvenient to clean and the like, the utility model provides a burette capable of accurately controlling the flow rate, the burette comprises a tube body and a titration adjuster arranged at the lower part of the tube body, and the titration adjuster comprises a plug sleeve and a plug column arranged in the plug sleeve. A plurality of groups of longitudinal flow channels are arranged on the plug sleeve in the diameter direction of the pipe body, each group of longitudinal flow channels vertically penetrate through the plug sleeve, a slotted hole is further formed in the plug sleeve, one end of the slotted hole is closed, the other end of the slotted hole is open, the plug hole is horizontally distributed in the radial direction of the pipe body, and the plurality of groups of longitudinal flow channels are communicated with the slotted hole; according to the device, the titration flow velocity is determined according to the number of the blocked longitudinal flow channels, the adjustment precision is high, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of burettes, in particular to a burette for accurately controlling flow velocity. Background Art

[0002] The most commonly used burette in the laboratory is an acid burette with a ground glass stopper at the bottom of the burette. In actual use, this burette has the following main problems:

[0003] 1. The operation is inconvenient and it is easy to leak. The main reason is that when turning the piston during use, if the force is slightly greater, the piston will be pulled out, causing leakage;

[0004] 2. The flow rate of the burette is difficult to control. The main reason is that the force of rotating the piston is not well controlled, which will cause unstable flow. If the opening is too small, the flow will drip too slowly or even not drip at all. If the opening is too large, the flow will drip too quickly or even exceed the end point.

[0005] 3. Maintenance is inconvenient, pistons and other parts are not easy to replace, easy to be scrapped, and have large losses.

[0006] The utility model patent with publication number CN215910421U provides an acid burette, comprising: a burette body, a titration flow control mechanism and a titration head; wherein the upper end of the titration flow control mechanism is connected to the burette body, and the lower end is connected to the titration head; the titration flow control mechanism comprises an outer tube, a movable plug, a screw and a nut; the outer tube is arranged horizontally, the upper end of the outer tube is connected to the burette body, and the lower end is connected to the titration head; the movable plug is arranged in the outer tube and can slide along the axis of the outer tube; a first titration with different inner diameters is arranged on the movable plug along its axis The outer tube has a first hole, a second hole and a third hole; the nut is fixed at the end of the outer tube; the first end of the screw extends into the outer tube and is rotatably connected to the end face of the movable plug, and the second end is threadedly connected to the nut and then extends out of the outer tube; although this scheme can adjust the titration flow rate, the titration hole is set on the movable plug, and the adjustment of the flow rate depends only on the size of the titration hole diameter, and the titration hole diameter is often determined when the product is formed, so the adjustment range is limited; and when impurities adhere to the inner wall of the titration hole, the movable plug, the screw and the nut need to be removed for subsequent cleaning. Utility Model Content

[0007] In order to solve the problems of low adjustment accuracy of titration flow rate of burette and inconvenient cleaning, the utility model provides a burette for accurately controlling flow rate, and the technical solution adopted is as follows:

[0008] A burette for accurately controlling flow rate, comprising a tube body and a titration regulator arranged at the lower part of the tube body, the titration regulator comprising a plug sleeve and a plug rod arranged inside the plug sleeve, characterized in that a plurality of groups of longitudinal flow channels are arranged on the plug sleeve along the diameter direction of the tube body, each group of longitudinal flow channels is distributed vertically through the plug sleeve, a slot hole is also arranged inside the plug sleeve, one end of the slot hole is closed and the other end is open, the plug holes are horizontally distributed along the radial direction of the tube body and the plurality of groups of longitudinal flow channels are connected to the slot holes, the plug rod can be slidably connected to the inside of the slot hole along the radial direction of the tube body and one end extends out of the plug sleeve.

[0009] Furthermore, an air inlet channel distributed along the axial direction of the plug is provided inside the plug, and one outer end of the air inlet channel passes through the plug. A plurality of groups of air outlet channels are also provided on the plug, and each group of air outlet channels is composed of two air outlet holes symmetrically arranged along the axial direction of the air outlet channel, and the plurality of groups of air outlet channels are distributed in a one-to-one correspondence with the plurality of groups of longitudinal flow channels.

[0010] Furthermore, an air plug is provided at one end of the outer side of the plug column, and the air plug is connected to the outer end of the slot hole by clamping.

[0011] Furthermore, a long strip-shaped protrusion is fixedly connected to one end of the outer side of the air plug.

[0012] Furthermore, a sealing ring is provided on the inner wall of one end of the plug hole opening.

[0013] Furthermore, the plug sleeve and the plug rod are both made of transparent glass.

[0014] Furthermore, the plug hole is a threaded hole, the outer surface of the plug rod is provided with an external thread, and the plug rod is threadedly connected to the plug hole.

[0015] The beneficial effects of the utility model are:

[0016] 1. There are multiple groups of longitudinal flow channels in the plug sleeve. The longitudinal flow channels can be blocked by the movement of the plug inside the plug sleeve. The titration flow rate is determined by the number of blocked longitudinal flow channels, and the flow rate adjustment is more accurate.

[0017] 2. An air inlet channel is provided in the plug, and an air outlet channel for connecting with the longitudinal flow channel is provided on the air inlet channel. External gas or medium enters the longitudinal flow channel through the air inlet channel and the air outlet channel, which is convenient for cleaning. Moreover, the air outlet channel can be adjusted to be connected or disconnected with the longitudinal flow channel by rotating the plug, so as to realize the respective use environments in the titration state and the cleaning state;

[0018] 3. A long strip-shaped protrusion is provided at one end of the outer side of the plug, and the length of the protrusion is consistent with the direction of the air outlet channel. The current position state of the air outlet channel can be clearly seen through the long strip-shaped protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the structure of the utility model

[0020] Figure 2 for Figure 1 Schematic diagram of the connection relationship between the plug sleeve and the plug in the state shown

[0021] Figure 3 Schematic diagram of the connection between the plug sleeve and the plug

[0022] Figure 4 Schematic diagram of the structure in which the protrusion is in a horizontal state

[0023] Figure 5 for Figure 4 Schematic diagram of the internal structure

[0024] Figure 6 The schematic diagram of the structure when the air intake channel is connected to the longitudinal flow channel

[0025] Figure 7 for Figure 6 Schematic diagram of the connection structure between the sleeve and the plug in the state

[0026] Figure 8 Schematic diagram of the structure in which the protrusion is in a vertical state

[0027] Fig. 9 for Figure 8 Schematic diagram of the internal structure in the state

[0028] Among them, 1-tube body, 2-plug sleeve, 3-plug hole, 4-longitudinal flow channel, 5-plug column, 6-sealing ring, 7-air inlet channel, 8-air outlet hole, 9-air plug, 10-protrusion. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] In the description of the utility model, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the viewing direction or position relationship, and are only for the convenience of describing the utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] like Figure 1-Figure 9The burette for accurately controlling flow rate shown in the figure comprises a tube body 1, wherein the upper and lower ends of the tube body 1 are respectively provided with a liquid addition port and a titration head, and the lower part of the tube body 1 is provided with a titration regulator connected to the titration head, wherein the titration regulator consists of a plug sleeve 2 and a plug column 5.

[0032] Specifically, the plug sleeve 2 is a rectangular parallelepiped structure as a whole, and its length in the left-right direction is greater than the diameter of the tube body 1. The plug sleeve 2 is integrally formed with the tube body 1 and the titration head. The plug sleeve 2 is provided with plug holes 3 horizontally distributed in the left-right direction. The left end of the plug hole 3 is sealed, and the right end penetrates the right end surface of the plug sleeve 2. In addition, five groups of longitudinal flow channels 4 evenly distributed at intervals are also provided on the plug sleeve 2. Each group of longitudinal flow channels 4 has the same diameter and is distributed in the vertical direction. The upper and lower ends of the longitudinal flow channels 4 respectively penetrate the upper and lower ends of the plug sleeve 2.

[0033] The plug rod 5 is arranged inside the plug hole 3 and extends out of the outer end of the plug sleeve 2 on the right side by a certain length. The plug rod 5 can slide left and right along the length direction of the plug hole 3, and an annular groove is also arranged on the inner wall of the right end of the plug hole 3. A sealing ring 6 is arranged in the annular groove, and the plug rod 5 and the sealing ring 6 are interference fit.

[0034] In addition, in the present embodiment, a cleaning structure is further provided inside the plug 5. Specifically, an air inlet channel 7 is provided inside the plug 5 along its length direction, i.e., the left-right direction. The right side of the air inlet channel 7 runs through the right end of the plug 5. Five groups of air outlet channels are provided in the length direction of the air inlet channel 7. Each group of air outlet channels is composed of two groups of air outlet holes 8 symmetrically arranged up and down. The five groups of air outlet channels are distributed correspondingly to the positions of the five groups of longitudinal flow channels 4. The two groups of air outlet holes 8 symmetrically arranged up and down are used to communicate with the same group of longitudinal flow channels 8. Moreover, a card is also provided at the right end of the air inlet channel 7. An air plug 9 is connected to seal the inside of the plug column 5. A protrusion 10 with a long strip structure is integrally formed at one end of the outer side of the air plug 9. The length direction of the protrusion 10 is distributed along the direction of the air outlet channel, that is, the length direction of the protrusion 10 is the same as the air outlet direction of the two air outlet holes 8, and is used to indicate the air outlet direction of the current air outlet channel. In this embodiment, when the plug column 5 moves to the left to the bottom, the five groups of longitudinal flow channels 4 are connected one by one with the five groups of air outlet channels, and the plug column 5 also includes an expanded diameter portion at the outer end, and the inner side surface of the expanded diameter portion is tightly fitted on the outer side surface of the sealing ring 6.

[0035] In another preferred embodiment, the plug 5 is connected to the plug hole 3 by means of threads. Specifically, the outer wall of the plug 5 is provided with external threads, the inner wall of the plug hole 3 is provided with internal threads, and the plug 5 is threadedly connected to the inside of the plug hole 3.

[0036] When the device needs to adjust the titration flow rate, Figure 1The initial state of the burette, at this time, the length direction of the outlet channel and the protrusion 10 are distributed along the front-to-back direction, the outlet channel and the inlet channel 7 are not connected with the longitudinal flow channel 4, the five groups of longitudinal flow channels 4 are blocked by the plug 5, the flow rate is zero, and the plug 5 is moved to the right to reach the position as shown in FIG. Figure 3 In the state shown, the number of connections of the longitudinal flow channel 4 is adjusted by the distance that the plug 5 moves to the right, thereby realizing the adjustment of the flow rate of the burette; when the plug 5 is connected to the plug hole 3 by threaded cooperation, even if the air outlet 8 is connected with the longitudinal flow channel 4 during the process of rotating the plug 5 left and right, there is no need to worry, only need to ensure that the protrusion 10 is not in the vertical position after the adjustment is completed. Of course, in order to further improve the reliability of flow rate adjustment, a one-way valve can also be set at the air outlet, and the one-way valve limits the flow direction of the medium from the air inlet channel 7 to the longitudinal flow channel 4.

[0037] When impurities are attached to the inner wall of the burette or the interior of the longitudinal flow channel 4, it is necessary to clean the impurities. At this time, the plug 5 moves to the left side to the leftmost end of the plug hole 3, such as Figure 7 As shown, at this time, the plug 5 is rotated until the air outlet 8 is connected to the longitudinal flow channel 4. At this time, the positional relationship and the connection state of the air outlet 8 and the longitudinal flow channel 4 can be judged by visual observation and whether the long strip protrusion 10 is located in the vertical direction. Figure 7 After reaching the state shown, the gas plug 9 is pulled out, and the external compressed gas pipeline is connected to the right end of the plug hole 3. The compressed gas flows into the longitudinal flow channel 4 through the air inlet channel 7 and the air outlet hole 8, thereby cleaning the impurities inside the longitudinal flow channel 4. After cleaning, the gas plug 9 is restored and connected to the right end of the plug hole 3.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A burette for accurately controlling flow rate, comprising a tube body and a titration regulator arranged at the lower part of the tube body, wherein the titration regulator comprises a plug sleeve and a plug arranged inside the plug sleeve, characterized in that: The plug sleeve is provided with a plurality of groups of longitudinal flow channels along the diameter direction of the tube body, and each group of longitudinal flow channels is distributed vertically through the plug sleeve. A slot hole is also provided inside the plug sleeve, and one end of the slot hole is closed and the other end is open. The plug holes are horizontally distributed along the radial direction of the tube body and the plurality of groups of longitudinal flow channels are connected to the slot holes. The plug rod can be slidably connected to the inside of the slot hole along the radial direction of the tube body and one end extends out of the outside of the plug sleeve.

2. The burette for accurately controlling flow rate according to claim 1, characterized in that: An air inlet channel distributed along the axial direction of the plug is arranged inside the plug, and one end of the outer side of the air inlet channel passes through the plug. A plurality of groups of air outlet channels are also arranged on the plug, and each group of air outlet channels is composed of two air outlet holes symmetrically arranged along the axial direction of the air outlet channel, and the plurality of groups of air outlet channels are distributed in a one-to-one correspondence with the positions of the plurality of groups of longitudinal flow channels.

3. The burette for accurately controlling flow rate according to claim 2, characterized in that: An air plug is arranged at one end of the outer side of the plug column, and the air plug is connected with the outer end of the slot hole by clamping.

4. The burette for accurately controlling flow rate according to claim 3, characterized in that: A long strip-shaped protrusion is fixedly connected to one end of the outer side of the air plug, and the length distribution direction of the protrusion is consistent with the length direction of the air outlet channel.

5. The burette for accurately controlling flow rate according to claim 1, characterized in that: A sealing ring is arranged on the inner wall of one end of the plug hole opening.

6. The burette for accurately controlling flow rate according to claim 1, characterized in that: The plug sleeve and the plug rod are both made of transparent glass material.

7. The burette for accurately controlling flow rate according to claim 1, characterized in that: The plug hole is a threaded hole, the outer surface of the plug rod is provided with an external thread, and the plug rod is threadedly connected to the plug hole.

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