Gun head assembly of pipette

Abstract

The utility model discloses a pipette tip assembly which comprises a connecting pipe, a suction pipe and a suspension nozzle assembly, one end of the connecting pipe is connected with a pipette body, the other end of the connecting pipe is detachably connected with the suction pipe, and the suspension nozzle assembly is sleeved outside the suction pipe; the suspension nozzle assembly comprises an air spraying pipe and a connecting assembly, one end of the air spraying pipe is fixed to the connecting pipe body through the connecting assembly, the air spraying pipe is arranged on the periphery of the suction pipe in a sleeving mode, an air flow channel is formed between the inner wall of the air spraying pipe and the outer wall of the suction pipe, and an air inlet channel is formed in the connecting assembly. External air enters from the air inlet channel, then is distributed to the airflow channel and finally is sprayed out from the end, away from the connecting assembly, of the air spraying pipe. When the gun head assembly of the pipette is applied to one-suction and multi-row operation in the experiment process, the operation is simple and easy, the experiment efficiency is greatly improved while the accuracy is ensured, meanwhile, the consumption of the suction pipe can be reduced, and the experiment cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pipette, especially to a pipette head assembly. BACKGROUND

[0002] A pipette, also known as a pipettor, is a measuring tool used to transfer a specific volume of liquid from one container to another. It is widely used in biology, chemistry, medicine, environmental science, food science, and other fields. The main function of a pipette is to accurately measure and transfer liquids, ensuring the accuracy and reliability of experiments. The accuracy of the operation is high when liquid is sucked and discharged in one operation, but if multiple discharges of the same amount of liquid are required during the experiment to improve efficiency, a one-suck multi-discharge operation is needed, that is, the liquid is discharged in multiple equal amounts after one washing. When multiple discharges are performed, the surface tension of the liquid causes some of the liquid to hang on the tip or outside of the plastic tip, resulting in inaccurate discharge of the liquid. If the liquid is discharged by relying on the external container, it may contaminate the experimental process.

[0003] Chinese utility model patent 201922088850.2 discloses a pipette head and a pipette. The pipette head includes a head and a purification tip. The head has a liquid suction channel with a mounting port and a liquid suction port at both ends. The purification tip has a purification channel with a mounting nozzle and a suction nozzle at both ends. A filter layer for purifying liquid is horizontally arranged in the purification channel. The mounting nozzle connected to the liquid suction port is arranged in cooperation with the liquid suction port. Although this patent can filter pollutants in liquid reagents and prevent pollutants from being sucked into the pipette and pipette head, liquid may hang on the pipette head during one-suck multi-discharge operation, which cannot guarantee the accuracy of each discharge.

[0004] Therefore, it is necessary to develop a pipette head assembly with high accuracy and suitable for one-suck multi-discharge operation. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to develop a pipette head assembly with high accuracy and suitable for one-suck multi-discharge operation.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A tip assembly of a pipette, comprising a connecting tube, a suction tube and a floating nozzle assembly, one end of the connecting tube is connected with a pipette body, the other end is detachably connected with the suction tube, the floating nozzle assembly is sleeved outside the suction tube; the floating nozzle assembly comprises a jet tube and a connecting assembly, one end of the jet tube is fixed on the connecting tube body through the connecting assembly, the jet tube is sleeved outside the suction tube, an airflow channel is formed between the inner wall of the jet tube and the outer wall of the suction tube, and the connecting assembly is provided with an air inlet channel, external gas enters the air inlet channel and is then shunted to the airflow channel, and finally is sprayed from the end of the jet tube away from the connecting assembly.

[0008] Further, the connecting assembly comprises a connecting head, the connecting head is provided with an air inlet channel and a plurality of shunt air holes, and the air inlet channel is communicated with the airflow channel through the shunt air holes.

[0009] Further, the top surface of the connecting head is concave to form a groove, the bottom surface of the connecting head extends outward to form a threaded boss, and the shunt air holes are through holes penetrating the groove and the threaded boss.

[0010] Further, the connecting tube comprises a connecting tube joint, a connecting tube body and an air inlet boss in sequence, the connecting tube joint is fixedly connected with the pipette body, and the air inlet boss is detachably connected with the suction tube.

[0011] Further, the air inlet channel is an air inlet hole penetrating the side wall of the connecting head, one side of the connecting tube body close to the air inlet boss is a lower end surface of the connecting tube body, one end of the lower end surface of the connecting tube body is inserted into the groove and connected with the connecting head, and the height of the air inlet hole is lower than that of the lower end surface of the connecting tube body.

[0012] Further, a hollow air tube is further arranged in the connecting tube, and the hollow air tube penetrates the connecting tube joint, the connecting tube body and the air inlet boss.

[0013] Further, the suction tube comprises a suction head, a suction tube body and a suction nozzle in sequence, and the suction head is sleeved outside the air inlet boss of the connecting tube; the jet tube comprises a jet head, a jet tube body and a jet nozzle in sequence, the jet head is threadedly connected with the threaded boss, and the jet nozzle is arranged around the suction nozzle.

[0014] Further, an end of the jet nozzle is provided with a lower edge of the jet nozzle, an end of the suction nozzle is provided with a suction nozzle end surface, and the height of the suction nozzle end surface is flush with that of the lower edge of the jet nozzle.

[0015] Further, the connecting head is further provided with a sleeve hole, the sleeve hole is sleeved outside the air inlet boss and the suction head in sequence, and the shunt air holes are arranged around the sleeve hole.

[0016] Further, the connecting assembly further comprises a fixing screw, a fixing hole is formed through the side wall of the groove, and the fixing hole is matched with the fixing screw to fix the connecting assembly on the connecting pipe body.

[0017] Compared with the prior art, the pipette gun head assembly has the following beneficial effects:

[0018] The pipette gun head assembly provided by the pipette gun head assembly has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided.

[0020] Figure 2 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided.

[0021] Figure 3 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided.

[0022] Figure 4 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided.

[0023] Figure 5 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided.

[0024] Figure 6 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided. Figure 1 ;

[0025] Figure 7 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided. Figure 2 ;

[0026] Figure 8 A structure diagram of the pipette gun head assembly provided by the pipette gun head assembly is provided.

[0027] The labels in the figures are described as follows:

[0028] Connecting pipe 1, connecting pipe joint 11, connecting pipe body 12, hollow air pipe 121, connecting pipe lower end surface 122, air inlet protrusion 13, first sealing ring 14, second sealing ring 15;

[0029] Suction pipe 2, suction head 21, suction pipe body 22, suction nozzle 23, suction nozzle end surface 231;

[0030] Connecting assembly 3, connecting head 31, fixing hole 311, groove 312, threaded protrusion 313, sleeve hole 314, shunt air hole 315, air inlet hole 316, fixing screw 32;

[0031] Air jet pipe 4, jet head 41, jet pipe body 42, jet nozzle 43, jet nozzle lower edge 431, jet nozzle upper edge 432. DETAILED DESCRIPTION

[0032] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, the terms "first", "second", "third" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0035] As described in the background, the existing pipette tip has low accuracy and is easy to cause contamination in the experimental process when performing one suction and multiple dispensing operation.

[0036] To solve the technical problem, the utility model provides a tip assembly of pipette, which is very suitable for one suction and multiple dispensing operation in the experimental process.

[0037] Specifically, refer to Figures 1-8 A tip assembly of pipette, comprising a connecting pipe 1, a suction pipe 2 and a suspension nozzle assembly, one end of the connecting pipe 1 is connected with a pipette body, the other end is detachably connected with the suction pipe 2, the suspension nozzle assembly is sleeved outside the suction pipe 2, the suspension nozzle assembly comprises a jet pipe 4 and a connecting assembly 3, one end of the jet pipe 4 is fixed on the connecting pipe body 12 through the connecting assembly 3, the jet pipe is sleeved outside the suction pipe 2, the inner wall of the jet pipe 4 and the outer wall of the suction pipe 2 form an airflow channel, the connecting assembly 3 is provided with an air inlet channel, external gas enters the air inlet channel and is then shunted to the airflow channel, and finally is sprayed from the end of the jet pipe 4 away from the connecting assembly 3.

[0038] The tip assembly of pipette provided by the utility model sleeves the jet pipe 4 outside the suction pipe 2, the liquid in the suction pipe 2 needs to pass through the nozzle 41 of the jet pipe 4 when being discharged, air is blown into the air inlet channel and is then shunted to the airflow channel formed by the inner wall of the jet pipe 4 and the outer wall of the suction pipe 2, and finally the air is discharged from the nozzle 41, the pressure is increased due to the narrowing of the space, and the residual liquid suspended in the end of the suction pipe 2 and the nozzle 41 is easily blown off, the operation is simple, and the accuracy of one suction and multiple dispensing operation is ensured.

[0039] In order for those skilled in the art to better understand the utility model scheme, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings.

[0040] It should be noted that, in the case of no conflict, the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other.

[0041] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0042] Embodiment 1

[0043] Please refer to Figures 1-8The utility model provides a gun head subassembly of pipette, it includes connecting pipe 1, suction tube 2 and suspension nozzle subassembly, one end of connecting pipe 1 is connected with pipette body, and the other end is detachably connected with suction tube 2. Suspension nozzle subassembly is set up in the outside of suction tube 2, and the liquid in suction tube 2 is discharged through the end of suspension nozzle subassembly, and the airflow channel is equipped between suspension nozzle subassembly and suction tube 2, and the liquid hanging on the end of suspension nozzle subassembly can be blown off by implementing the positive pressure to airflow channel, and suction tube 2 does not need to rely on the inner wall of external container when discharging, improves the pipetting precision and prevents cross contamination.

[0044] Specifically, as shown in Figure 2 and 3 , the connecting pipe 1 is a hollow structure, which includes a connecting pipe joint 11, a connecting pipe body 12 and an air inlet boss 13 in sequence, the connecting pipe joint 11 is fixedly connected with the distal end of the pipette, the connecting pipe body 12 extends to lead out the air inlet boss 13 away from the connecting pipe joint 11, and a hollow air pipe 121 is further arranged in the connecting pipe 1, specifically, the hollow air pipe 121 penetrates through the connecting pipe joint 11, the connecting pipe body 12 and the air inlet boss 13, the air inlet boss 13 is detachably connected with the suction tube 2, when the pipette, the connecting pipe 1 and the suction tube 2 are connected, the pipette discharges part of the air in the suction tube 2 through the hollow air pipe 121 by the piston movement, and then the liquid is sucked by the atmospheric pressure.

[0045] Further, as shown in Figure 2 and 4 , the suction tube 2 includes a suction head 21, a suction tube body 22 and a tapered nozzle 23 formed by extending the suction tube body 22 away from the suction head 21, the suction head 21 is sleeved on the outer periphery of the air inlet boss 13 of the connecting pipe 1, thereby forming the detachable connection between the air inlet boss 13 and the suction tube 2.

[0046] Further, the first sealing ring 14 is further arranged between the suction head 21 and the air inlet boss 13 to prevent air leakage.

[0047] Further, as shown in Figure 2 and Figures 5-7 , the suspension nozzle subassembly includes a jet pipe 4 and a connecting assembly 3, the jet pipe 4 is sleeved on the outside of the suction tube 2, one end of the jet pipe 4 is fixed to one end of the connecting pipe body 12 close to the air inlet boss 13 through the connecting assembly 3, specifically, a gap is left between the inner wall of the jet pipe 4 and the outer wall of the suction tube 2 to form an airflow channel between the inner wall of the jet pipe 4 and the outer wall of the suction tube 2, and the connecting assembly 3 is provided with an air inlet channel, and the external gas enters the air inlet channel and then is shunted to the airflow channel, and finally is sprayed from one end of the jet pipe 4 away from the connecting assembly 3.

[0048] Specifically, the air jet pipe 4 comprises a nozzle 41 and a nozzle body 42, and a conical nozzle 43 formed along the nozzle body 42 extending away from the nozzle 41. The nozzle 41 is fixed to the connecting pipe body 12 near the air inlet 13 by the connecting assembly 3. The nozzle 43 is arranged around the suction nozzle 23. After the liquid in the suction pipe 2 is discharged from the suction nozzle 23, it needs to flow into the external container through the nozzle 43 at the end of the air jet pipe 4. A small amount of liquid will be suspended at the end of the suction nozzle 23 or inside and outside the nozzle 43.

[0049] Further, the connecting assembly 3 comprises a connecting head 31 and a fixing screw 32. The top surface of the connecting head 31 is concave to form a groove 312. The bottom surface of the connecting head 31 extends outward to form a threaded boss 313. The side wall of the groove 312 is provided with a fixing hole 311. The inner wall of the fixing hole 311 is provided with threads which are matched with the fixing screw 32. The size of the groove 312 is matched with the connecting pipe body 12. The end of the connecting pipe body 12 near the air inlet 13 is inserted into the groove 312, and the fixing screw 32 is matched with the fixing hole 311 and tightened to realize the fixed connection between the connecting assembly 3 and the connecting pipe body 12.

[0050] Further, the center of the connecting head 31 is also provided with a sleeve hole 314 which is arranged through the groove 312 and the threaded boss 313 in sequence. The sleeve hole 314 is sleeved on the air inlet 13 and the outside of the suction head 21 in sequence. When installing, the air inlet 13 is passed through the sleeve hole 314 and then the suction head 21 is sleeved on the outer periphery of the air inlet 13. Then the connecting assembly 3 is fixed on the connecting pipe body 12.

[0051] Further, the inner wall of the nozzle 41 is provided with threads. The nozzle 41 is threadedly connected with the threaded boss 313 to realize the fixed connection between the nozzle 41 and the connecting assembly 3.

[0052] Further, the second sealing ring 15 is arranged between the groove 312 and the connecting pipe body 12 to prevent air leakage.

[0053] Further, the air inlet channel is an air inlet hole 316 arranged on the connecting head 31. The air inlet hole 316 is arranged through the side wall of the connecting head 31. The connecting head 31 is also provided with a plurality of shunt holes 315. Specifically, the shunt holes 315 are through holes arranged through the groove 312 and the threaded boss 313. The shunt holes 315 are arranged around the sleeve hole 314. Air is blown from the air inlet hole 316 into the airflow channel formed between the inner wall of the air jet pipe 4 and the outer wall of the suction pipe 2 through the shunt holes 315, and finally discharged from the nozzle 43. When discharging, the space narrows and the air pressure increases, so that the liquid suspended at the end of the suction nozzle 23 or inside and outside the nozzle 43 is blown off to ensure the accuracy of the pipetting.

[0054] Furthermore, the height of the air inlet 316 is lower than the lower end face 122 of the connecting pipe. The lower end face 122 of the connecting pipe and the inner wall and bottom of the groove 312 form a cavity. After the gas enters the cavity through the air inlet 316, it enters the airflow channel through the diversion air hole 315 to ensure smooth air intake.

[0055] Furthermore, such as Figure 8 As shown, the jet pipe 4 is sleeved on the outside of the suction pipe 2, and the nozzle 43 is arranged around the suction mouth 23. Specifically, the end of the suction mouth 23 is provided with a suction mouth end face 231, and the end of the nozzle 43 is provided with a lower edge 431 and an upper edge 432. The suction mouth end face 231 is placed between the lower edge 431 and the upper edge 432 of the nozzle to ensure that the liquid at the end of the suction mouth 23 can be blown off smoothly. Preferably, in this embodiment, the height of the suction mouth end face 231 and the lower edge 431 of the nozzle are flush, so that the operator can clearly observe the discharge of the liquid.

[0056] The process of using the pipette tip assembly proposed in this utility model is as follows: Fix the connecting tube 11 of the connecting tube 1 to the end of the pipette body, pass the air inlet protrusion 13 through the sleeve hole 314 of the connecting assembly 3, insert the end of the connecting tube body 12 connected to the air inlet protrusion 13 into the groove 312, put the pipette 2 on the outer periphery of the air inlet protrusion 13, and install the fixing screw 32 into the fixing hole 311. Thus, the connecting assembly 3 is fixed on the connecting tube body 12. Then, put the nozzle 41 of the air jet tube 4 on the threaded protrusion 313 and tighten it to complete the assembly of the pipette tip assembly. In use, first insert the end of the pipette tip assembly into the liquid to complete the aspiration. Before the first dispensing, air is introduced through the air inlet 316 to blow off the liquid suspended inside the lower edge 431 of the nozzle and outside the end face 231 of the pipette tip. Then, adjust the pipette to control the dispensing volume and dispensing multiple times. After each dispensing, air is introduced through the air inlet 316 to blow off the liquid suspended inside the nozzle 43, making the pipetting more accurate. Especially in micro-pipetting, it can achieve multiple dispensings from a single aspiration, ensuring accuracy while saving time and the consumption of the pipette 2.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A tip assembly for a pipette gun, the tip assembly comprising: It includes: The connecting pipe (1), the suction pipe (2) and the suspension nozzle assembly, one end of the connecting pipe (1) is connected with the pipette body, the other end is detachably connected with the suction pipe (2), the suspension nozzle assembly is sleeved on the outside of the suction pipe (2); the suspension nozzle assembly includes a jet pipe (4) and a connecting assembly (3), one end of the jet pipe (4) is fixed on the connecting pipe body (12) through the connecting assembly (3), the jet pipe (4) is sleeved on the outer periphery of the suction pipe (2), the inner wall of the jet pipe (4) and the outer wall of the suction pipe (2) form an airflow channel, the connecting assembly (3) is provided with an air inlet channel, and the external gas enters the air inlet channel and is then shunted to the airflow channel, and finally is sprayed from the end of the jet pipe (4) away from the connecting assembly (3).

2. The tip assembly of a pipette according to claim 1, wherein The connecting assembly (3) includes a connecting head (31), the connecting head (31) is provided with an air inlet channel and a plurality of shunt gas holes (315), and the air inlet channel is communicated with the airflow channel through the shunt gas holes (315).

3. The tip assembly of a pipette according to claim 2, wherein, The top surface of the connecting head (31) is concave to form a groove (312), the bottom surface of the connecting head (31) extends outward to form a threaded boss (313), and the shunt gas hole (315) is a through hole penetrating the groove (312) and the threaded boss (313).

4. The tip assembly of a pipette according to claim 3, wherein The connecting pipe (1) includes a connecting pipe joint (11), a connecting pipe body (12) and an air inlet boss (13) in sequence, the connecting pipe joint (11) is fixedly connected with the pipette body, and the air inlet boss (13) is detachably connected with the suction pipe (2).

5. The tip assembly of a pipette according to claim 4, wherein The air inlet channel is a gas inlet hole (316) penetrating the side wall of the connecting head (31), one side of the connecting pipe body (12) close to the air inlet boss (13) is a lower end surface (122) of the connecting pipe, one end of the lower end surface (122) of the connecting pipe body (12) is inserted into the groove (312) and connected with the connecting head (31), and the height of the gas inlet hole (316) is lower than that of the lower end surface (122) of the connecting pipe.

6. The tip assembly of a pipette according to claim 3, wherein, A hollow air pipe (121) is further arranged in the connecting pipe (1), and the hollow air pipe (121) penetrates the connecting pipe joint (11), the connecting pipe body (12) and the air inlet boss (13).

7. The tip assembly of a pipette according to claim 6, wherein The suction pipe (2) includes a suction head (21), a suction pipe body (22) and a suction nozzle (23) in sequence, the suction head (21) is sleeved on the outer periphery of the air inlet boss (13) of the connecting pipe (1); the jet pipe (4) includes a jet head (41), a jet pipe body (42) and a jet nozzle (43) in sequence, the jet head (41) is threadedly connected with the threaded boss (313), and the jet nozzle (43) is arranged around the suction nozzle (23).

8. The tip assembly of a pipette according to claim 7, wherein, The end of the jet nozzle (43) is provided with a lower edge (431) of the jet nozzle, the end of the suction nozzle (23) is provided with a suction nozzle end surface (231), and the height of the suction nozzle end surface (231) and the lower edge (431) of the jet nozzle is flush.

9. The tip assembly of a pipette according to claim 7, wherein, The connecting head (31) is further provided with a sleeve hole (314), the sleeve hole (314) is sleeved on the outside of the air inlet boss (13) and the suction head (21) in sequence, and the shunt gas hole (315) is arranged around the sleeve hole (314).

10. The tip assembly of a pipette according to claim 3, wherein The connecting assembly (3) further comprises a fixing screw (32), a side wall of the groove (312) is provided with a fixing hole (311) penetrating through, the fixing hole (311) is matched with the fixing screw (32) to fix the connecting assembly (3) on the connecting pipe body (12).

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