CN215694092U - Liquid-transfering gun head fastener - Google Patents
Liquid-transfering gun head fastener Download PDFInfo
- Publication number
- CN215694092U CN215694092U CN202121931897.1U CN202121931897U CN215694092U CN 215694092 U CN215694092 U CN 215694092U CN 202121931897 U CN202121931897 U CN 202121931897U CN 215694092 U CN215694092 U CN 215694092U
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- Prior art keywords
- pipette
- gun head
- tip
- head
- pipette tip
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- Expired - Fee Related
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000012546 transfer Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 26
- 230000000452 restraining effect Effects 0.000 claims description 9
- 239000013013 elastic material Substances 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000005060 rubber Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 239000004809 Teflon Substances 0.000 claims 1
- 229920006362 Teflon® Polymers 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 229920002725 thermoplastic elastomer Polymers 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012864 cross contamination Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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- Automatic Analysis And Handling Materials Therefor (AREA)
Abstract
The utility model discloses a liquid-transfering gun head fastening device, which comprises a gun head conversion assembly and a gun head dismounting support; the pipette head conversion assembly is in a roughly hollow tubular shape and comprises a clamping part and an expansion part, the clamping part is used for being connected with a suction nozzle of the liquid transfer gun, the expansion part is used for being connected with the pipette head, the clamping part is sleeved outside the suction nozzle of the liquid transfer gun, and the expansion part is embedded in the pipette head; the gun head unloading support comprises an upper yielding ring, a lower yielding ring and a connecting rod, wherein the upper yielding ring and the lower yielding ring are respectively arranged above and below the gun head conversion assembly and are connected through the connecting rod; the gun head unloading support further comprises a sliding rod, the sliding rod is arranged on the inner wall of the tube cavity of the gun head rotating component, and the gun head unloading support is connected with the gun head converting component in a sliding mode through the sliding rod.
Description
Technical Field
The utility model relates to the field of biological experiment instruments, in particular to a liquid transfer gun head fastening device.
Background
Biological detection often needs to use a pipette, a pipette is one of pipettes and is commonly used for moving a small amount of or trace liquid in a laboratory, as shown in fig. 1, the basic structure of the pipette 100 comprises a control button 110, a gun head dismounting button 120, a volume display window 130, a sleeve 140, a suction nozzle 150 and other structures, and when the measuring range is adjusted, the pipette is rotated to the required volume according to the control button 110 at one end of the pipette 100; and the pipette tip is a disposable liquid-removing member mounted on the suction nozzle of the pipette.
In current liquid-transfering gun head structure, there are a great deal of problems: 1) the sealing performance between the suction nozzle of the pipette and the pipette head is poor, and the phenomenon of dripping can occur after liquid absorption; 2) the inner wall of the pipette head is smooth, the friction force between the pipette head and the handle of the pipette gun sleeve is small, the pipette head is easy to loosen after liquid absorption, so that the handle of the pipette gun sleeve falls off, and the use stability is poor; 3) in order to guarantee the sealing performance between the pipette head and the pipette handle, a large force is needed during assembly, so that the sealing performance is affected due to the abrasion of the pipette handle, and in addition, the pipette handle is easily excessively inserted into the pipette head to cause the damage of the pipette head.
Based on the above-mentioned problems, many patents disclose novel pipette tip structures, such as grant publication numbers: CN203830035U, chinese patent of granted publication No. 2014.9.17 discloses an anti-drop pipette tip, which is fastened between the pipette tip and a suction nozzle by arranging an elastic sealing ring and a step in the pipette tip, but in the experimental operation process, the pipette tip is almost disposable for preventing cross contamination, so the structure of the pipette tip itself is increased and improved too much, which inevitably results in cost increase and material waste.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a pipette head fastening device which is used for solving the problem of poor sealing property between a pipette head and a pipette in the prior art.
In order to solve the problems, the utility model adopts the following technical scheme:
the liquid-transfering gun head fastening device comprises a gun head conversion assembly and a gun head dismounting support;
the pipette head conversion assembly is in a roughly hollow tubular shape and comprises a clamping part and an expansion part, the clamping part is used for being connected with a suction nozzle of the liquid transfer gun, the expansion part is used for being connected with the pipette head, the clamping part is sleeved outside the suction nozzle of the liquid transfer gun, and the expansion part is embedded in the pipette head;
the gun head unloading support comprises an upper yielding ring, a lower yielding ring and a connecting rod, wherein the upper yielding ring and the lower yielding ring are respectively arranged above and below the gun head conversion assembly and are connected through the connecting rod;
the gun head unloading support further comprises a sliding rod, the sliding rod is arranged on the inner wall of the tube cavity of the gun head rotating component, and the gun head unloading support is connected with the gun head converting component in a sliding mode through the sliding rod.
As a preferred technical scheme, the gun head conversion assembly further comprises elastic sealing rings which are respectively arranged on the inner side surface of the upper port and the outer side surface of the lower port of the gun head conversion assembly and are respectively used for forming a sealing surface in interference fit with a suction nozzle of the pipette gun and a sealing surface in interference fit with the pipette gun head.
According to the preferable technical scheme, the inner diameter of the upper port of the gun head conversion assembly is slightly smaller than the outer diameter of the suction nozzle of the liquid transfer gun, and the outer diameter of the lower port of the gun head conversion assembly is slightly larger than the inner diameter of the liquid transfer gun.
As a preferred technical scheme, the lance head conversion assembly is made of an elastic material, and the elastic material comprises silica gel, rubber and plastic or a mixed thermoplastic elastic material.
According to a preferable technical scheme, the outer diameter of the lance head conversion assembly is gradually reduced from two ends to the middle.
According to the preferable technical scheme, metal wires are annularly arranged below the inner wall of the tube cavity of the gun head conversion assembly and are radially arranged downwards and outwards.
As a preferred technical scheme, the upper yielding ring is arranged above the upper end of the gun head conversion assembly, and the shape of the upper yielding ring is matched with that of the lower end of the pipette sleeve; the lower yielding ring is sleeved above the lower end of the pipette head conversion assembly, and the shape of the lower yielding ring is matched with that of the upper end of the pipette head.
According to a preferable technical scheme, the lower end of the sliding rod is fixedly connected with a restraining ring, the initial position of the restraining ring is the middle position of the inner wall of a tube cavity of the gun head conversion assembly, and a ring groove for the restraining ring to move up and down is further arranged below the inner wall of the tube cavity.
As a preferred technical scheme, the connecting rod is arranged outside the lance head conversion assembly.
As a preferable technical scheme, the lance tip discharging bracket is made of stainless steel wrapped by polytetrafluoroethylene.
The technical scheme adopted by the utility model can achieve the following beneficial effects:
the technical scheme of the utility model provides a pipette head fastening device which comprises a pipette head conversion assembly and a pipette head dismounting support, wherein the pipette head conversion assembly is made of elastic materials, the upper end of the pipette head conversion assembly can be contracted to be sleeved on a suction nozzle of a pipette and clamped, and the lower end of the pipette head conversion assembly can be expanded and can be embedded into and sealed with the pipette head; the unloading bracket can move downwards under the extrusion of the pipette sleeve for unloading the pipette head. Because the technical scheme provided by the utility model does not directly improve the structure of the liquid-transfering gun or the liquid-transfering gun head, the liquid-transfering gun or the liquid-transfering gun head has stronger applicability and can be used for a plurality of times for a long time, thereby avoiding the condition of large waste caused by the reconstruction of a disposable liquid-transfering gun head or poor applicability caused by the reconstruction of a liquid-transfering gun head.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof illustrate the present invention and do not constitute a limitation of the present invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art pipette;
FIG. 2 is a schematic view of a pipette tip fastening device disclosed in a preferred embodiment of an embodiment of the present invention;
FIG. 3 is a schematic view of a pipette tip fastening device disclosed in another preferred embodiment of an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a pipette tip fastening device disclosed in another preferred embodiment of an embodiment of the present invention;
FIG. 5 is a diagram illustrating a state of use of the pipette tip fastening device according to an embodiment of the present invention.
The following reference signs are specifically included:
the pipette comprises a pipette 100, a control button 110, a pipette tip unloading button 120, a volume display window 130, a sleeve 140 and a suction nozzle 150; the pipette tip fastening device 200, the pipette tip conversion assembly 210, the clamping part 211, the expansion part 212, the elastic sealing ring 213, the pipette tip dismounting bracket 220, the upper yielding ring 221, the lower yielding ring 222, the connecting rod 223, the sliding rod 224, the restraining ring 225 and the annular groove 226; pipette tip 300.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. In the description of the present invention, it is noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, in the process of using a pipette, the sealing property between a suction nozzle of the pipette and the pipette head is poor, so that the phenomenon of leakage often occurs after liquid suction; and when the existing liquid-transfering gun head is inserted into a suction nozzle of the liquid-transfering gun, the assembly can be completed by often needing larger force, so that the suction nozzle of the liquid-transfering gun is abraded, the sealing performance is influenced, and the liquid-transfering gun head are easily damaged due to the fact that the suction nozzle of the liquid-transfering gun is excessively inserted into the liquid-transfering gun head. In order to solve the problem, the embodiment provides a pipette tip fastening device, which is arranged between a pipette suction nozzle and a pipette tip and is used for connecting and sealing the pipette suction nozzle and the pipette tip, so that the structure of the pipette or the pipette tip is not needed, the applicability is stronger, the pipette can be used for a long time, and the waste of consumables is avoided.
Referring to fig. 2-5, in a preferred embodiment, a pipette tip fastening device 200 is provided, which includes a pipette tip conversion assembly 210 and a pipette tip removal bracket 220, which are slidably connected; the gun head conversion assembly 210 is used for connecting and sealing the suction nozzle 150 of the pipette gun and the pipette head 300, and the gun head dismounting bracket 220 is used for conveniently dismounting the pipette head 300.
According to fig. 2 and 5, the lance head converting assembly 210 is substantially hollow and tubular, and has an upper end provided with a clamping portion 211 which can radially contract and is sleeved outside the suction nozzle 150 of the pipette 100 for connection and sealing therewith; the lower end of the tip conversion assembly 210 is an expansion part 212 which can expand radially outward and is embedded in the pipette tip 300 for connecting and fixing the pipette tip 300.
Preferably, referring to fig. 4, the tip converting assembly 210 further includes elastic sealing rings 213 disposed at two upper and lower ports of the tip converting assembly 210, the two elastic sealing rings 213 are respectively disposed at an inner side surface of the upper port of the tip converting assembly 210 and an outer side surface of the lower port of the tip converting assembly, and are respectively used for forming a sealing surface in interference fit with the suction nozzle 150 of the pipette tip 100 and a sealing surface in interference fit with the pipette tip 300, the two elastic sealing rings 213 not only can increase the sealing performance between the tip converting assembly 210 itself and the suction nozzle 150, and the pipette tip 300, and reduce the occurrence of the dripping phenomenon, but also can make the three have higher stability and more firm connection, and will not fall off in the processes of liquid suction and liquid pipetting of the pipette tip 300.
Preferably, in order to further improve the connection stability between the suction nozzle 150 and the pipette tip 300, the inner diameter of the upper port of the tip conversion assembly 210 is slightly smaller than the outer diameter of the suction nozzle 150, and the outer diameter of the lower port is slightly larger than the inner diameter of the pipette tip 300; further, the lance tip converting assembly 210 is made of an elastic material, preferably silicone, rubber or a mixed thermoplastic elastic material. This design not only prevents the thermoplastic material from being worn and deformed after long-term use, which would result in the failure of the pipette tip, but also provides a greater pressure in cooperation with the elastic sealing ring 213 at the port to clamp and secure the suction nozzle 150 of the pipette 100 and to expand and secure the pipette tip 300.
Further, referring to fig. 2, 3 and 5, the tip removing bracket 220 includes an upper relief ring 221, a lower relief ring 222 and a connecting rod 223, wherein the upper relief ring 221 is disposed above the upper end of the tip converting assembly 210, and has a shape matching the shape of the lower end of the pipette sleeve 140, so as to support the squeezing from the lower end of the pipette sleeve 140 when the pipette tip 300 is removed; the lower yielding ring 222 is sleeved above the lower end of the tip converting assembly 210, and the shape of the lower yielding ring matches with the shape of the upper end of the pipette tip 300, so as to transmit the force from the lower end of the pipette sleeve 140 and press the pipette tip 300 to be detached.
The upper yielding ring 221 is fixedly connected with the lower yielding ring 222 through a connecting rod 223, and the connecting rod 223 is arranged outside the gun head conversion assembly 210 so as to prevent the gun head conversion assembly 210 from being damaged when the gun head unloading bracket 220 moves up and down; further, the gun head discharging bracket 220 further comprises a slide rod 224, the slide rod 224 is arranged in the inner wall of the tube cavity of the gun head rotating member assembly, and a channel for the slide rod 224 to move up and down is arranged in the inner wall of the tube cavity, so that the gun head discharging bracket 220 is slidably connected with the gun head conversion assembly 210 through the slide rod 224. Preferably, the material of the lance tip discharging bracket 220 is preferably made of polytetrafluoroethylene-coated stainless steel so that the lance tip discharging bracket is not corroded by the reagent to cause deformation or pollution to the reagent.
Preferably, in order to facilitate the mounting and dismounting of the pipette tip 300 and avoid deformation of the expansion part 212 of the tip switching assembly 210 after the pipette tip 300 is mounted and dismounted for multiple times, as shown in fig. 3 and 4, in a preferred embodiment, the outer diameter of the tip switching assembly 210 is gradually reduced from two ends to the middle part, and is in a substantially funnel shape; it is suitable for it, in tip to unload the slide bar 224 lower end of the support 220 fixedly connect with the restraint ring 225, the initial position of the restraint ring 225 is about the middle position of lumen inner wall of the tip switching assembly 210, there is a ring groove 226 for the restraint ring 225 to move up and down below the lumen inner wall, when needing to unload the pipette tip 300, the tip to unload the support 220 to move down and drive the restraint ring 225 to move down, make the originally outwardly expanded expansion part 212 contract inwards, make the pipette tip 300 unload fast. In a more preferred embodiment, a metal wire is annularly arranged below the inner wall of the lumen of the tip conversion assembly 210, the metal wire is radially arranged downwards and outwards, and by arranging the metal wire, after the expansion part 212 of the tip conversion assembly 210 is inserted into the pipette tip 300, the expansion force can be stronger, and the stability and the sealing performance can be further improved.
In this example, the specific application method of the present invention is as follows:
referring to fig. 2 to 5, when the pipette tip 300 is assembled by using the pipette tip 100, first, the clamping portion 211 of the pipette tip fastening device 200 is sleeved outside the suction nozzle 150 of the pipette tip 100, then the tip removing button 120 of the pipette tip 100 is pressed down to move the sleeve 140 downward to squeeze the upper yielding ring 221, the upper yielding ring is moved downward to drive the lower yielding ring 222 and the restraining ring 225 through the connecting rod 223 and the sliding rod 224, the restraining ring 225 is moved downward to contract the expanding portion 212 inward, and at this time, the pipette tip 300 is inserted into the pipette tip 300, the tip removing button 120 is released, and the expanding portion 212 expands to clamp the pipette tip 300; after pipetting is completed, the pipette tip removing button 120 of the pipette tip 100 is pressed again, so that the sleeve 140 moves downwards to press the upper concession ring 221, the lower concession ring 222 is driven to withdraw downwards from the pipette tip 300, and meanwhile, the restriction ring 225 also moves downwards to enable the expansion part 212 to contract inwards, thereby facilitating the removal of the pipette tip 300.
The utility model has the following advantages: the structure of the device comprises a gun head conversion assembly and a gun head dismounting support, wherein the gun head conversion assembly is made of elastic materials, the upper end of the gun head conversion assembly can be contracted to be sleeved on a suction nozzle of a liquid transfer gun and clamped, and the lower end of the gun head conversion assembly can be expanded and can be embedded into the liquid transfer gun head and sealed; the unloading bracket can move downwards under the extrusion of the pipette sleeve for unloading the pipette head. Because the technical scheme provided by the utility model does not directly improve the structure of the liquid-transfering gun or the liquid-transfering gun head, the liquid-transfering gun or the liquid-transfering gun head has stronger applicability and can be used for a plurality of times for a long time, thereby avoiding the condition of large waste caused by the reconstruction of a disposable liquid-transfering gun head or poor applicability caused by the reconstruction of a liquid-transfering gun head.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. A liquid-transfering gun head fastener is characterized by comprising a gun head conversion assembly and a gun head dismounting support;
the pipette head conversion assembly is in a roughly hollow tubular shape and comprises a clamping part and an expansion part, the clamping part is used for being connected with a suction nozzle of the liquid transfer gun, the expansion part is used for being connected with the pipette head, the clamping part is sleeved outside the suction nozzle of the liquid transfer gun, and the expansion part is embedded in the pipette head;
the gun head unloading support comprises an upper yielding ring, a lower yielding ring and a connecting rod, wherein the upper yielding ring and the lower yielding ring are respectively arranged above and below the gun head conversion assembly and are connected through the connecting rod;
the gun head unloading support further comprises a sliding rod, the sliding rod is arranged on the inner wall of the tube cavity of the gun head rotating component, and the gun head unloading support is connected with the gun head converting component in a sliding mode through the sliding rod.
2. The pipette tip fastening device according to claim 1, wherein the pipette tip conversion assembly further comprises elastic sealing rings respectively disposed on an inner side surface of the upper port and an outer side surface of the lower port of the pipette tip conversion assembly, and the elastic sealing rings are respectively used for forming a sealing surface in interference fit with the pipette tip suction nozzle and a sealing surface in interference fit with the pipette tip.
3. The pipette tip fastening device of claim 2, wherein the inner diameter of the upper port of the tip conversion assembly is slightly smaller than the outer diameter of the pipette nozzle, and the outer diameter of the lower port of the tip conversion assembly is slightly larger than the inner diameter of the pipette tip.
4. The pipette tip fastening device of claim 3, wherein the tip switching assembly is made of an elastic material comprising silicone, rubber plastic, or a hybrid thermoplastic elastomer.
5. The pipette tip fastening device of claim 4, wherein the outer diameter of the tip switching assembly gradually decreases from the two ends to the middle.
6. The pipette tip fastening device of claim 5, wherein wires are looped under the inner wall of the lumen of the tip switching assembly, and the wires are radially arranged downward and outward.
7. The pipette tip fastening device of claim 1, wherein the upper yielding ring is arranged above the upper end of the tip conversion assembly and has a shape matching the shape of the lower end of the pipette sleeve; the lower yielding ring is sleeved above the lower end of the pipette head conversion assembly, and the shape of the lower yielding ring is matched with that of the upper end of the pipette head.
8. The pipette tip fastening device according to claim 7, wherein a restraining ring is fixedly connected to the lower end of the slide rod, the initial position of the restraining ring is the middle position of the inner wall of the tube cavity of the pipette tip conversion assembly, and a ring groove for the restraining ring to move up and down is further arranged below the inner wall of the tube cavity.
9. The pipette tip fastening device of claim 8, wherein the linkage is disposed outside of the lance tip transition assembly.
10. The pipette tip fastening device of claim 9, wherein the tip discharge holder is made of teflon-coated stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121931897.1U CN215694092U (en) | 2021-08-17 | 2021-08-17 | Liquid-transfering gun head fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121931897.1U CN215694092U (en) | 2021-08-17 | 2021-08-17 | Liquid-transfering gun head fastener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215694092U true CN215694092U (en) | 2022-02-01 |
Family
ID=79997514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121931897.1U Expired - Fee Related CN215694092U (en) | 2021-08-17 | 2021-08-17 | Liquid-transfering gun head fastener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215694092U (en) |
-
2021
- 2021-08-17 CN CN202121931897.1U patent/CN215694092U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220201 |