CN113083390A

CN113083390A - Suction tube

Info

Publication number: CN113083390A
Application number: CN202110317003.8A
Authority: CN
Inventors: 胡明明; 张战科
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-07-09

Abstract

The application provides a straw, including extrusion portion, ration portion, imbibition portion, and sliding ball. Wherein the extrusion part is provided with an extrusion space, and at least part of the extrusion part is elastic. The quantitative part is provided with a first through hole, one end of the quantitative part is connected with the extrusion part, and the first through hole is communicated with the extrusion space. The sliding ball is arranged in the first through hole and is in sealing connection with the inner side wall of the quantitative part, and the sliding ball can slide along the axial direction of the quantitative part. The liquid absorbing part is provided with a second through hole, the liquid absorbing part is connected to the other end of the quantifying part, and the second through hole is communicated with the first through hole; and the cross sectional dimension of at least part of the second through holes is smaller than that of the first through holes, so that the sliding ball can be in sealed abutment with the liquid suction part. In conclusion, the suction pipe provided by the application has the advantages of high precision, simplicity and convenience in operation, high suction efficiency, no need of manually and deliberately calculating scales, realization of sucking liquid with high-precision volume requirement only by one-time suction operation, and capability of accurately controlling the oil feeding amount.

Description

Suction tube

Technical Field

This application belongs to weighing device technical field, concretely relates to straw.

Background

In daily life, industrial production and scientific experiments, a certain amount of liquid is sucked by a suction pipe and transferred to other objects, so that the purpose of a user is achieved. However, the precision of the prior suction tube is not high, the liquid with high precision and volume requirement can not be sucked, and the sucking efficiency is low.

Disclosure of Invention

In view of this, the present application provides a straw comprising:

the extrusion part is provided with an extrusion space, and at least part of the extrusion part has elasticity;

the quantitative part is provided with a first through hole, one end of the quantitative part is connected with the extrusion part, and the first through hole is communicated with the extrusion space;

the sliding ball is arranged in the first through hole, is in sealing contact with the inner side wall of the quantitative part and can slide along the axial direction of the quantitative part; and

the liquid absorbing part is provided with a second through hole, the liquid absorbing part is connected to the other end of the quantifying part, and the second through hole is communicated with the first through hole; and the cross sectional dimension of at least part of the second through hole is smaller than that of the first through hole, so that the sliding ball can be in sealed abutment with the liquid suction part.

The application provides a straw, through the extrusion portion, ration portion, imbibition portion to and the cooperation between the sliding ball four realizes the accurate quantitative liquid of absorbing. The specific implementation method comprises the following steps: when the straw is in an initial state, the sliding ball is in an initial position in the quantitative portion. When the straw is in a squeezing state, the user can squeeze the squeezing part. Since the sliding ball is in sealing contact with the inner side wall of the quantitative section, the gas in the pressing space can push the sliding ball to slide in the axial direction of the quantitative section and in the direction close to the liquid suction section. And because the cross sectional dimension of at least part of the second through hole is smaller than that of the first through hole, the sliding ball can be in sealed abutment with the liquid suction part when sliding to the liquid suction part with the cross sectional dimension of the second through hole smaller than that of the first through hole in the sliding process.

At the moment, the straw is stretched into the liquid, the hand is released, and the squeezing part can restore to the original shape due to the elasticity of at least part of the squeezing part. And the rebound of the squeezing part can drive the sliding ball to slide to the initial position again from the position where the sealing is abutted to the liquid suction part, and the liquid is sucked into the suction pipe. Since the volume of liquid sucked up is the volume of the dosing section between the sliding ball sliding from the initial position to the sealing abutment against the liquid absorbing section. And because the position of the sealing and abutting liquid suction part is relatively fixed, the volume formed by the sliding of the sliding ball can be accurately controlled by controlling the initial position, so that the volume of the sucked liquid is accurately controlled, and the sucking efficiency is improved.

In conclusion, the suction pipe provided by the application has the advantages of high precision, simplicity and convenience in operation, high suction efficiency, no need of manually and deliberately calculating scales, realization of sucking liquid with high-precision volume requirement only by one-time suction operation, and capability of accurately controlling the oil feeding amount.

Drawings

In order to more clearly explain the technical solution in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.

FIG. 1 is a cross-sectional view of a straw according to an embodiment of the present application.

FIG. 2 is a cross-sectional view of a pipette in an initial state according to one embodiment of the present application.

FIG. 3 is a schematic cross-sectional view of a straw in a squeezed state according to an embodiment of the present application.

FIG. 4 is a schematic cross-sectional view of a pipette according to one embodiment of the present application after aspirating a liquid.

FIG. 5 is a cross-sectional view of another embodiment of the straw of the present application.

FIG. 6 is a cross-sectional view of another embodiment of the straw of the present application.

FIG. 7 is a cross-sectional view of a straw in accordance with another embodiment of the present application.

FIG. 8 is a schematic cross-sectional view of a quantitative section in an embodiment of the present application.

FIG. 9 is a cross-sectional view of a straw in accordance with yet another embodiment of the present application.

FIG. 10 is a cross-sectional view of a straw in accordance with yet another embodiment of the present application.

Description of reference numerals:

the suction pipe comprises a suction pipe-1, an extrusion part-10, an extrusion space-11, a rubber head-12, a sub-extrusion part-13, a quantitative part-20, a first through hole-21, an inner side wall-22, an installation groove-23, a bottom wall-231, a side wall 232, a sliding ball-30, a liquid suction part-40, a second through hole-41, an inner side surface-42, an outer side surface-43, a butting surface-44 and a sealing ring-50.

Detailed Description

The following is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

In daily life, industrial production and scientific experiments, a certain amount of liquid is sucked by a suction pipe and transferred to other objects, so that the purpose of a user is achieved. For example, in the Surface Mounting Technology (SMT) lamination equipment industry, FUJI NXT lamination equipment is widely used. The mounting working head of the equipment is an assembly for mounting electronic components on a printed PCB according to the program requirement.

In addition, a plurality of movable parts in the mounting working head need to be refueled and maintained, and the refueled parts of the mounting working head have refueled quantities with different specifications, such as 0.336CC, 0.272CC, 0.124CC, 0.054CC, 0.022CC, 0.02CC and the like. Although the mounting head requires a small amount of fuel, it is required to be accurate. When the amount of fuel added is too small, the effects of lubrication and maintenance are not achieved. When the amount of the added oil is excessive, the excessive oil may be splashed onto the PCB, thereby contaminating the PCB.

Currently, there are 3 refueling modes: in the first mode, a cotton swab is used for dipping oil, and then the cotton swab is used for adding the oil to a part needing oil adding, but the oil adding amount is difficult to control. In the second method, a burette for chemical experiments is used, but a burette with a perfect matching accuracy cannot be found. In addition, the burette realizes the actions of sucking and oiling by pinching the rubber head at the bottom by hands, the control of the amount is not well mastered, and the efficiency is very low. In the third mode, the small needle tube provided by FUJI NXT patch equipment is used for filling oil, when oil is filled, a person needs to carefully look at the scales of the needle tube, and the scales are added by calculation, and then the scales are pushed by the piston of the needle tube, so that the accuracy of the oil filling amount is very difficult to control, the oil filling amount is not enough or more, the efficiency is very low, and the accuracy of the needle tube is 0.01CC and cannot reach the required accuracy.

In summary, the technical problems existed at present are: the precision of the suction pipe is not high, liquid with high precision and volume requirements cannot be sucked, the oil adding amount cannot be accurately controlled, oil is added or added in a small amount, quality abnormity is easily caused, and the motion of a moving part of the working head is blocked or the service life is shortened. The suction efficiency is low. Moreover, scales need to be calculated manually and deliberately, which causes great working difficulty.

In view of the above, in order to solve the above problems, the present application provides a straw. Referring to fig. 1-4 together, fig. 1 is a schematic cross-sectional view of a straw according to an embodiment of the present disclosure. FIG. 2 is a cross-sectional view of a pipette in an initial state according to one embodiment of the present application. FIG. 3 is a schematic cross-sectional view of a straw in a squeezed state according to an embodiment of the present application. FIG. 4 is a schematic cross-sectional view of a pipette according to one embodiment of the present application after aspirating a liquid. The present embodiment provides a pipette 1 including a squeezing section 10, a quantifying section 20, a liquid-sucking section 40, and a sliding ball 30. Wherein, the extrusion part 10 is provided with an extrusion space 11, and at least part of the extrusion part 10 has elasticity. The quantitative part 20 is provided with a first through hole 21, one end of the quantitative part 20 is connected with the extrusion part 10, and the first through hole 21 is communicated with the extrusion space 11. And a sliding ball 30 disposed in the first through hole 21, wherein the sliding ball 30 is in sealing contact with an inner sidewall 222 of the quantitative section 20, and the sliding ball 30 is slidable in an axial direction of the quantitative section 20. The liquid absorbing part 40 is provided with a second through hole 41, the liquid absorbing part 40 is connected to the other end of the quantitative part 20, and the second through hole 41 is communicated with the first through hole 21; and the cross-sectional dimension of at least part of the second through hole 41 is smaller than that of the first through hole 21, so that the sliding ball 30 can be sealed and abutted against the liquid suction part 40.

The pipette 1 provided in the present embodiment can be used for sucking various liquids, such as water, oil, acidic solution, alkaline solution, salt solution, various mixed solutions, and the like. The present application is not limited thereto.

The straw 1 provided by the embodiment comprises a squeezing part 10, wherein the squeezing part 10 is used for squeezing by a user so as to control liquid suction and liquid discharge. Alternatively, the pressing part 10 includes a hollow rubber head 12, and a sub-pressing part 13 connecting the rubber head 12. The pressing space 11 is also formed by the rubber head 12 together with the sub-pressing part 13.

The pipette 1 of the present embodiment further includes a quantitative portion 20, the quantitative portion 20 is provided with a first through hole 21 penetrating through two opposite sides of the quantitative portion 20, and the squeezing portion 10 is connected to one end of the quantitative portion 20, so that the squeezing space 11 can communicate with the first through hole 21. The dosing section 20 is used for sucking up a dosed amount of liquid, and the present application how this is achieved will be described in detail below.

The pipette 1 provided by the present embodiment further includes a liquid absorption portion 40, the liquid absorption portion 40 is provided with second through holes 41 penetrating through two opposite sides of the liquid absorption portion 40, the liquid absorption portion 40 is connected to the other end of the quantitative portion 20, so that the second through holes 41 communicate with the first through holes 21, and the extrusion space 11, the first through holes 21, and the second through holes 41 can be connected into a whole. And the other end of the liquid absorbing portion 40 serves as a suction nozzle which can be inserted into the liquid and absorb the liquid.

The straw 1 of the present embodiment further comprises a sliding ball 30, wherein the sliding ball 30 is disposed in the first through hole 21, the sliding ball 30 is in sealing contact with the inner sidewall 222 of the quantitative portion 20, i.e. the sliding ball 30 divides the first through hole 21 into two sub-through holes, and the air on both sides of the sliding ball 30 is not transmitted and exchanged. And the sliding ball 30 can slide in the axial direction of the quantitative section 20 (as shown in the direction of D1 in fig. 1), so that the gas on both sides is also pushed.

Alternatively, the material of the sub-squeezing portion 13, the quantitative portion 20, and the liquid absorbing portion 40 in this embodiment includes glass, and the sliding ball 30 may be a stainless steel ball or a ceramic ball. The rubber head 12 is made of rubber.

The pipette 1 according to the present embodiment can accurately suck a predetermined amount of liquid by the cooperation of the squeezing unit 10, the quantitative unit 20, the liquid sucking unit 40, and the sliding ball 30. The specific implementation method comprises the following steps: when the pipette 1 is in the initial state, the sliding ball 30 is in an initial position in the quantitative section 20. When the straw 1 is in a squeezed state, the user can squeeze the squeeze part 10. Since the sliding ball 30 is in sealing contact with the inner side wall 222 of the quantitative section 20, the gas in the pressing space 11 can push the sliding ball 30 to slide in the axial direction of the quantitative section 20 and in the direction close to the liquid absorption section 40. And since the cross-sectional dimension of at least part of the second through hole 41 is smaller than that of the first through hole 21, the sliding ball 30 can be sealed and abutted against the liquid suction part 40 when sliding to the liquid suction part 40 with the cross-sectional area of the second through hole 41 smaller than that of the first through hole 21 during sliding. At this time, since the sliding ball 30 is already in contact with the liquid absorbing portion 40, the sliding ball 30 cannot slide, and the squeezing portion 10 cannot be squeezed any more.

At this time, the straw 1 can be inserted into the liquid, and the hand is released, so that the pressing part 10 can be restored to the original shape due to the elasticity of at least part of the pressing part 10. And the rebound of the pressing part 10 may cause the sliding ball 30 to slide again from the sealing abutment against the liquid sucking part 40 to the initial position and suck the liquid into the suction tube 1. Since the volume of the liquid sucked is the volume of the quantitative section 20 between the sliding ball 30 sliding from the initial position to the sealing abutment against the liquid sucking section 40. And because the position of the sealing and abutting liquid absorbing part 40 is relatively fixed, the volume formed by the sliding of the sliding ball 30 can be accurately controlled by only controlling the initial position, so that the volume of the absorbed liquid can be accurately controlled, and the absorption efficiency is improved.

Then the suction tube can be moved to the part to be lubricated, the rubber head 12 is pinched down by hand, the sliding ball 30 moves towards the direction close to the liquid suction part 40 under the pressure of the gas in the extrusion space 11, and the liquid in the sliding ball is added to the part to be lubricated, so that the quantitative oil adding action is realized, and the accurate quantitative oil can be added to the corresponding part to be lubricated.

The above may also be understood as: the squeezing part 10 is controlled to squeeze, the sliding ball 30 is driven to slide in the quantitative part 20, and slide to the liquid absorption part 40, and then liquid absorption is performed, so that the volume of the absorbed liquid can be accurately controlled, for example, only the initial position of the sliding ball 30 in the quantitative part 20 needs to be controlled, and the liquid with the same volume of 0.336CC, 0.272CC, 0.124CC, 0.054CC, 0.022CC, and 0.02CC can be accurately absorbed.

In conclusion, the suction pipe 1 provided by the application has the advantages of high precision, simplicity and convenience in operation, high suction efficiency, no need of manually and deliberately calculating scales, realization of sucking liquid with high-precision volume requirement only by one-time suction operation, and accurate control of the oil feeding amount.

Referring to fig. 1 to 4 again, in the present embodiment, the cross-sectional dimension of the second through hole 41 close to the quantitative portion 20 is larger than the cross-sectional dimension of the second through hole 41 far from the quantitative portion 20.

Several implementations are provided for making the cross-sectional dimension of at least a portion of the second through-holes 41 smaller than the cross-sectional dimension of the first through-holes 21. In the first mode, the liquid absorbing part 40 is not completely vertical or horizontal, but the cross-sectional dimension of the second through hole 41 close to the quantitative part 20 is larger than that of the second through hole 41 far from the quantitative part 20, that is, the liquid absorbing part 40 is a structure with a wide top and a narrow bottom, and one end of the liquid absorbing part 40 far from the quantitative part 20 is a structure with a narrow width. This may first facilitate the liquid absorption portion 40 extending into the liquid to absorb the liquid. Secondly, the sliding ball 30 can be in sealing contact with the liquid absorbing part 40 when sliding to a certain position of the liquid absorbing part 40, because the liquid absorbing part 40 is narrowed, the cross-sectional dimension of the second through hole 41 is smaller than that of the first through hole 21.

In the present embodiment, the slide ball 30 may be in contact with the liquid absorbing portion 40, not in contact with the boundary between the liquid absorbing portion 40 and the quantitative section 20.

Referring to FIG. 5, FIG. 5 is a cross-sectional view of a straw according to another embodiment of the present application. In the present embodiment, a part of the liquid absorbing portion 40 is embedded in the quantitative section 20, the liquid absorbing portion 40 has an inner side surface 42 and an outer side surface 43 which are oppositely arranged, the outer side surface 43 is connected with the inner side wall 222, and the inner side surface 42 protrudes from the inner side wall 222.

In the present embodiment, a part of the liquid absorbing portion 40 can be fitted into the quantitative section 20, thereby making it possible to reduce the difficulty of connecting the liquid absorbing portion 40 to the quantitative section 20. In the present embodiment, the outer surface 43 is connected to the inner wall 222, and the inner surface 42 protrudes from the inner wall 222, so that the cross-sectional dimension of the second through-hole 41 is smaller than the cross-sectional dimension of the first through-hole 21, and the slide ball 30 abuts against the liquid suction unit 40. In the present embodiment, the sliding ball 30 may abut the inner side surface 42 of the liquid absorbing portion 40, or the sliding ball 30 may abut another surface of the liquid absorbing portion 40.

Referring to FIG. 6, FIG. 6 is a cross-sectional view of a straw according to another embodiment of the present application. In the present embodiment, the liquid absorbing portion 40 further includes a contact surface 44 that connects the inner surface 42 and the outer surface 43 in a bent manner, at least a part of the contact surface 44 protrudes from the inner wall 222, and at least a part of the contact surface 44 has a shape matching the shape of the slide ball 30.

In the second embodiment, the liquid absorbing portion 40 has an abutment surface 44 that connects the inner surface 42 and the outer surface 43 by bending, in addition to the inner surface 42 and the outer surface 43. The contact surface 44 is a surface of the liquid absorbing portion 40 on a side close to the squeezing portion 10. And at least part of the abutting surface 44 protrudes from the inner sidewall 222, so that the inner sidewall 42 protrudes from the inner sidewall 222, and the cross-sectional dimension of the second through hole 41 is smaller than the cross-sectional dimension of the first through hole 21, at this time, the sliding ball 30 abuts against the abutting surface 44. In the present embodiment, the slide ball 30 may be in contact with the liquid absorbing portion 40 and the quantitative section 20 at the connection position.

In addition, in the present embodiment, the shape of at least a part of the contact surface 44 may be matched to the shape of the slide ball 30, and the sealing performance after the slide ball 30 is contacted with the contact surface 44 may be improved.

Referring to fig. 7-8 together, fig. 7 is a cross-sectional view of a straw according to another embodiment of the present application. FIG. 8 is a schematic cross-sectional view of a quantitative section in an embodiment of the present application. In the present embodiment, an installation groove 23 is provided at an end of the quantitative section 20, and the liquid absorbing section 40 is provided in the installation groove 23.

In the present embodiment, the fixing groove 23 is formed at the end of the quantitative section 20 close to the liquid absorbing section 40, and the liquid absorbing section 40 is disposed in the fixing groove 23, thereby further reducing the connection performance of the liquid absorbing section 40 to the fixing groove 23. In addition, since the volume of the liquid sucked is the volume which the sliding ball 30 slides when sliding from the initial position to the abutment position, these two positions are the central importance of the present application. In the present embodiment, when the contact surface 44 of the liquid absorbing portion 40 contacts the bottom wall 231 of the mounting groove 23, the position of the liquid absorbing portion 40 is determined. The position of the liquid absorbing part 40 can be controlled by controlling the depth of the mounting groove 23, i.e., the length of the side wall 232 of the mounting groove 23. At this time, the initial position of the sliding ball 30 in the first through hole 21 is controlled or adjusted, so that the volume of the liquid to be sucked can be accurately controlled.

In summary, the mounting groove 23 of the present embodiment not only facilitates the mounting of the liquid absorption portion 40, but also controls the position of the liquid absorption portion 40, thereby reducing the difficulty in controlling the volume of the liquid to be absorbed.

Referring to FIG. 9, FIG. 9 is a cross-sectional view of a straw according to another embodiment of the present application. In the present embodiment, the pipette 1 further includes a seal ring 50, the seal ring 50 is provided in the mounting groove 23, and the liquid suction portion 40 abuts against the seal ring 50.

In the present embodiment, the sealing ring 50 may be additionally provided, and the sealing ring 50 may be provided in the mounting groove 23, specifically, the sealing ring 50 may be provided on the bottom wall 231 of the mounting groove 23, and at this time, the contact surface 44 of the liquid absorbing portion 40 may contact the sealing ring 50 instead of the bottom wall 231 of the mounting groove 23, and the sealing performance between the liquid absorbing portion 40 and the quantitative portion 20 may be improved by the sealing ring 50. Because the sliding ball 30 is in sealing contact with the inner side wall 222 of the quantitative portion 20, the sliding ball 30 is in sealing contact with the liquid absorption portion 40, and the liquid absorption portion 40 is in sealing contact with the quantitative portion 20, a good sealing relation can be formed among the sliding ball 30, the liquid absorption portion 40 and the liquid absorption portion 40, so that air cannot circulate among the sliding ball 30, the sealing performance of the straw 1 is improved, and the squeezing portion 10 cannot be squeezed continuously when the sliding ball 30 is in contact with the liquid absorption portion 40.

The foregoing discusses some of the mating relationships of the liquid absorbing portion 40 to other components when the sliding ball 30 abuts the liquid absorbing portion 40. And it can be seen from the above that the volume of the liquid sucked is also dependent on the initial position of the sliding ball 30, and the present application will next describe several cases when the sliding ball 30 is located at the initial position.

Referring to FIG. 10, FIG. 10 is a cross-sectional view of a straw according to another embodiment of the present application. In the present embodiment, the pipette 1 has an initial state, and the cross-sectional dimension of the pressing space 11 near the quantitative section 20 is smaller than the cross-sectional dimension of the first through hole 21 so that the sliding ball 30 abuts against the pressing section 10 when the pipette 1 is in the initial state.

In the first mode, the cross-sectional dimension of the pressing space 11 of the quantitative section 20 can also be made smaller than the cross-sectional dimension of the first through hole 21, and the sliding ball 30 abuts against the pressing section 10 when the pipette 1 is in the initial state. That is, the slide ball 30 abuts the pressing portion 10 at the initial position and abuts the liquid absorbing portion 40 in the pressed state. It will also be understood that the sliding ball 30 has a fixed position in both the initial and final positions, and therefore the sliding ball 30 slides in a fixed volume, i.e. the volume of liquid drawn is also fixed, for the purpose of accurately drawing a fixed amount of liquid. Moreover, the method and the device are convenient to install and reduce the difficulty of determining the initial position.

As for the specific structure of the pressing portion 10, the structure of the liquid absorbing portion 40 can be referred to, and the detailed description thereof is omitted.

In addition, the quantitative section 20 is detachably connected to both the pressing section 10 and the liquid absorbing section 40. In the present embodiment, the quantitative section 20 may be detachably connected to the pressing section 10 and the liquid absorbing section 40, that is, the pressing section 10, the quantitative section 20, and the liquid absorbing section 40 may be separated from each other, and since the initial position and the final position of the sliding ball 30 respectively abut against the pressing section 10 and the liquid absorbing section 40, the size of the quantitative section 20 may be changed to change the volume. For example, one volume type of the metering portion 20 may be used when it is desired to draw up 0.336CC of liquid. Another volume type of the metering portion 20 may be used when it is desired to draw a volume of 0.272CC of liquid, which is also the name of the metering portion 20.

Referring to fig. 7 again, in the present embodiment, the pipette 1 has an initial state, and when the pipette 1 is in the initial state, the sliding ball 30 is disposed between the squeezing portion 10 and the liquid absorbing portion 40.

In the second embodiment, the quantitative section 20 does not need to be replaced, and three of the pressing section 10, the quantitative section 20, and the liquid-absorbing section 40 can be fixedly connected without being detachably connected. At this time, when the pipette 1 is in the initial state, the slide ball 30 may be disposed between the squeezing unit 10 and the liquid suction unit 40. The position of the sliding ball 30 at this time is the initial position. And the present embodiment can change the volume of the liquid to be sucked by changing the position of the sliding ball 30, that is, the distance between the sliding ball 30 and the liquid suction part 40.

For example, since the predetermined portions 20 are marked with predetermined marks and the end positions are all abutted against the liquid sucking portion 40, the volume of the liquid to be sucked can be easily changed by simply installing the sliding ball 30 at the predetermined positions. Specifically, the quantitative section 20 is marked with an a-mark line representing 0.336CC, and is also marked with a B-mark line representing 0.272 CC. When it is desired to suck the liquid of 0.336CC, the initial position of the sliding ball 30 may be moved to the a-mark line at the time of installation. When it is desired to suck the liquid of 0.272CC, the initial position of the sliding ball 30 may be moved to the B-mark line at the time of installation.

In addition, referring to fig. 5 to 10 again, in the present embodiment, at least one of the pressing portion 10 and the liquid absorbing portion 40 is screwed to the quantitative portion 20; alternatively, the pressing portion 10 is connected to the quantitative portion 20 in an interference fit with at least one of the liquid absorbing portions 40.

In the present embodiment, when the pressing portion 10 and the liquid absorbing portion 40 are detachably connected to the dosing portion 20, several connection methods are provided. In the first mode, the pressing portion 10 and at least one of the liquid absorbing portions 40 are screwed to the quantitative portion 20. The pressing portion 10 and the liquid absorbing portion 40 are screwed together by providing an internal thread on the inner wall 222 of the quantitative section 20 and an external thread on the outer wall 232 thereof. In a second implementation, the pressing portion 10 is connected to the dosing portion 20 in an interference fit with at least one of the liquid absorbing portions 40. Specifically, the pressing portion 10 and the liquid absorbing portion 40 may be made elastic. The pressing part 13 and the liquid absorbing part 40 are pressed to be narrowed, then the pressing part and the liquid absorbing part are inserted into the quantitative part 20, and then hands are released, so that the pressing part 10 and the liquid absorbing part 40 can be tightly abutted on the inner side wall 222 of the quantitative part 20 due to the action of the resilience force, and therefore, the interference fit connection is realized, and the assembly difficulty is reduced.

The foregoing detailed description has provided for the embodiments of the present application, and the principles and embodiments of the present application have been presented herein for purposes of illustration and description only and to facilitate understanding of the methods and their core concepts; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A drinking straw, comprising:

2. The pipette of claim 1 wherein the cross-sectional dimension of said second through-hole proximate said dosing section is greater than the cross-sectional dimension of said second through-hole distal from said dosing section.

3. The pipette according to claim 1 wherein a portion of said aspirating portion is embedded in said dosing portion, said aspirating portion having an inner side and an outer side disposed opposite each other, said outer side connecting said inner side wall, said inner side protruding from said inner side wall.

4. The pipette of claim 3 wherein said pipette tip further comprises an abutment surface that is folded to connect said inner side surface to said outer side surface, at least a portion of said abutment surface protruding from said inner side wall, and at least a portion of said abutment surface having a shape that matches the shape of said sliding ball.

5. The pipette as specified in claim 3 wherein the end of said quantitative section is provided with an installation groove and said pipette section is disposed in said installation groove.

6. The pipette of claim 5 further comprising a sealing ring disposed in said mounting groove, said pipette section abutting said sealing ring.

7. The pipette of claim 1 wherein said pipette has an initial state, said expression space adjacent said dosing section having a cross-sectional dimension less than a cross-sectional dimension of said first through-hole such that said sliding ball may abut said expression section when said pipette is in the initial state.

8. The pipette of claim 1 wherein said pipette has an initial state and said sliding ball is disposed between said expression portion and said aspiration portion when said pipette is in said initial state.

9. The pipette of claim 1 wherein said expression portion and said aspiration portion are each removably connected to said dosing portion.

10. The pipette of claim 9 wherein said expression portion is threadably connected to at least one of said pipetting portion and said dosing portion; alternatively, the pressing portion is connected to the quantitative portion in an interference fit with at least one of the liquid suction portions.