Pipettor

Abstract

The utility model provides a pipettor which comprises a pipettor shell, a control structure and a suction pipe structure, the control structure and the suction pipe structure are matched with the pipettor shell, and the control structure is used for controlling the suction pipe structure to suck or distribute liquid; the suction pipe structure comprises a suction pipe connecting part used for being detachably matched with a pipettor suction head, an embedding groove is formed in the peripheral wall of the suction pipe connecting part, and an annular sealing structure is embedded in the embedding groove; according to the device, the annular sealing structure (sealing ring) is arranged on the peripheral wall of the suction tube connecting part of the pipettor, so that the annular sealing structure is in sealing fit with the inner wall of the suction head of the pipettor, and the suction head matched with the pipettor does not need to be provided with the sealing structure; the pipettor can be matched with a pipettor suction head without a sealing structure, and the production cost of the pipettor suction head is reduced.

Description

Technical Field

[0001] The utility model relates to the field of biochemical laboratory equipment, in particular to a pipette. Background Art

[0002] A pipette, also called a pipette gun, is a measuring tool for transferring liquid from an original container to another container within a certain measuring range. It is widely used in biology, chemistry and other fields. At present, the pipette tip is an elongated, conical shape, and its cross-section increases from the lower opening to the upper opening. The lower end of the main body has a lower opening for passing liquid, and the upper end has an upper opening for connecting to one end of the pipette of the pipette.

[0003] Existing pipette tips are usually loaded and unloaded by plugging and pulling. For example, an annular sealing structure is provided on the inner wall of the upper opening of the pipette tip so that the pipette tip is sleeved on the pipette of the pipette, and the annular sealing structure contacts and cooperates with the outer peripheral wall of the pipette of the pipette to form a seal.

[0004] For example, the utility model patent with authorization announcement number CN219003117U provides a highly sealed pipette tip, which includes a body, wherein the body includes a tube head and a tube body, wherein the tube head and the tube body are interconnected, and a sealing mechanism is provided at the opening of the tube head away from one end of the tube body. The pipette tip of the utility model seals the joint between the pipette tip and the pipette by providing a sealing mechanism (i.e., a sealing ring) to reduce bubbles that appear during the process of absorbing liquid.

[0005] Since pipette tips are usually disposable items, the cost of providing a sealing ring on each pipette tip is high, resulting in high experimental costs. In order to reduce costs and save resources, the applicant provides a pipette so that the end of its pipette can be adapted to a pipette tip without a sealing ring and achieve a good sealing effect. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a pipette. The technical solution adopted by the utility model is as follows:

[0007] A pipette comprises a pipette housing, a control structure and a straw structure arranged in cooperation with the pipette housing, wherein the control structure is used to control the straw structure to absorb or dispense liquid; the straw structure comprises a straw connecting portion for detachably cooperating with the pipette tip, an embedding groove is provided on the outer peripheral wall of the straw connecting portion, and an annular sealing structure is embedded in the embedding groove.

[0008] Preferably, the annular sealing structure is an annular sealing ring, and the outer surface of the annular sealing ring is in contact with the inner wall of the pipette tip.

[0009] Preferably, the annular sealing structure is embedded in the embedding groove so that the outer surface of the annular sealing structure is flush with the outer peripheral wall of the straw connecting part.

[0010] Preferably, a pipette shell is also provided with a tip ejection structure, which includes a sleeve sleeved outside the straw structure and a sleeve pressing portion driving the sleeve to slide axially. Driven by the sleeve pressing portion, the sleeve slides axially and pushes the upper end surface of the pipette tip to disengage it from the straw connecting portion.

[0011] Preferably, the pipette tip comprises a pointed mouth-shaped liquid suction portion, a tubular liquid storage cavity portion and a tip connecting portion which are sequentially connected, and the inner wall of the tip connecting portion is tightly matched with the annular sealing structure to achieve a detachable connection between the pipette tip and the straw structure.

[0012] Preferably, the outer end portion of the straw connecting portion (referring to the end away from the pipette housing) is a conical surface, and the annular sealing structure is arranged on the side of the conical surface close to the pipette housing; the conical surface facilitates the smooth installation of the pipette tip on the straw connecting portion, and makes the outer surface of the annular sealing structure contact with the inner wall of the pipette tip to form a tight fit.

[0013] Preferably, the embedding groove comprises two first embedding grooves and a second embedding groove which are spaced apart from each other, and a clamping groove is provided between the first embedding groove and the second embedding groove, annular sealing rings are embedded in the first embedding groove and the second embedding groove, an annular protrusion is provided on the inner wall of the tip connecting part, the annular protrusion cooperates with the clamping groove when the tip connecting part and the straw connecting part are sleeved, and the pipette tip (including the annular protrusion) is integrally formed with the same material.

[0014] Preferably, the outer surface of the annular sealing structure is provided with annular convex patterns to increase the static friction between the annular sealing structure and the inner wall of the pipette tip.

[0015] Preferably, the pipette housing is further provided with a volume indicating window, the control structure comprises a volume adjusting knob, and the volume indicating window is used to display the volume of the aspirated liquid.

[0016] Preferably, the pipette housing is also provided with anti-slip convex patterns.

[0017] The beneficial effects of the utility model are as follows: the device embeds an annular sealing structure (sealing ring) on ​​the outer peripheral wall of the pipette tube connecting part of the pipette, so that the annular sealing structure and the inner wall of the pipette tip form a sealing fit, thereby eliminating the need to set a sealing structure on the tip adapted to the pipette; the pipette can be adapted to pipette tips without a sealing structure, thereby reducing the production cost of the pipette tips. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0019] Figure 1 It is a schematic diagram of the structure of Embodiment 1 of the present device (the pipette and the pipette tip are separated);

[0020] Figure 2 This is a schematic diagram of the assembly of Embodiment 1 of the device;

[0021] Figure 3 This is a schematic diagram of the structure of the straw connection part of the embodiment 1 of the device;

[0022] Figure 4 This is a schematic diagram of the structure of the suction head connection part of the embodiment 1 of the present device;

[0023] Figure 5 This is a cross-sectional schematic diagram of the engagement between the card slot and the annular protrusion in Embodiment 1 of the device;

[0024] In the figure, 1-shell, 11-anti-slip convex pattern, 2-sleeve, 21-sleeve pressing part, 3-tube connecting part, 31-annular sealing structure, 311-first embedding groove, 312-second embedding groove, 32-card slot, 321-upper plane, 322-lower inclined surface, 4-control structure, 5-pipette tip, 51-pointed liquid absorption part, 52-tubular liquid storage cavity part, 53-tip connecting part, 531-annular protrusion. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that the directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only references to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1-2As shown, a pipette comprises a pipette housing 1, a control structure 4 and a straw structure arranged in cooperation with the pipette housing 1, wherein the control structure 4 is used to control the straw structure to absorb or dispense liquid; the straw structure comprises a straw connecting part 3 for detachably cooperating with a pipette tip 5, an embedding groove is provided on the outer peripheral wall of the straw connecting part 3, and an annular sealing structure 31 is embedded in the embedding groove.

[0029] In this embodiment, the annular sealing structure 31 is an annular sealing ring, and the outer surface of the annular sealing ring contacts and cooperates with the inner wall of the pipette tip 5 .

[0030] Furthermore, the annular sealing structure 31 is embedded in the embedding groove so that the outer surface of the annular sealing structure 31 is flush with the outer peripheral wall of the straw connecting part 3 .

[0031] The present pipette also includes a tip withdrawal structure for separating the pipette tip 5 from the straw after the pipetting is completed. The tip withdrawal structure includes a sleeve 2 sleeved outside the straw structure and a sleeve pressing portion 21 for driving the sleeve 2 to slide axially. The sleeve pressing portion 21 is pressed downward so that the sleeve 2 slides axially under the drive of the sleeve pressing portion 21 and pushes against the upper end surface of the pipette tip 5 to separate it from the straw connecting portion 3.

[0032] In this embodiment, the pipette tip 5 includes a pointed liquid suction portion 51, a tubular liquid storage cavity portion 52 and a tip connecting portion 53 which are connected in sequence. The inner wall of the tip connecting portion 53 is tightly matched with the annular sealing structure 31 to achieve a detachable connection between the pipette tip 5 and the straw structure.

[0033] Furthermore, the outer end of the straw connecting part 3 is a conical surface, and the annular sealing structure 31 is arranged on the side of the conical surface close to the pipette housing 1; the conical surface facilitates the smooth installation of the pipette tip 5 on the straw connecting part 3, and makes the outer surface of the annular sealing structure 31 contact with the inner wall of the pipette tip 5 to form a tight fit.

[0034] Reference Figure 3 , Figure 4 At least two spaced first embedding grooves 311 and second embedding grooves 312 are provided at the outer end of the straw connecting portion 3, and a clamping groove 32 is provided between the first embedding groove 311 and the second embedding groove 312. Annular sealing rings are embedded in the first embedding groove 311 and the second embedding groove 312. An annular protrusion 531 is provided on the inner wall of the tip connecting portion 53. When the pipette tip 5 is sleeved on the straw connecting portion 3, the annular protrusion 531 is embedded in the clamping groove 32. In order to save costs, the entirety of the pipette tip 5 (including the annular protrusion 531) is integrally formed of plastic material.

[0035] Further, see Figure 5The slot 32 has an upper plane 321 and a lower inclined surface 322. When the tip connecting part 53 is sleeved onto the straw connecting part 3, the upper plane 321 limits the forward stroke of the annular protrusion 531 so that it is positioned in the slot 32. The lower inclined surface 322 facilitates the withdrawal of the pipette tip 5 and separation from the straw connecting part 3.

[0036] Furthermore, the outer surface of the annular sealing ring is provided with annular convex patterns, which are used to increase the static friction between the annular sealing structure 31 and the inner wall of the pipette tip 5 , so that the pipette tip 5 and the straw connecting part 3 are reliably connected.

[0037] The pipette housing 1 is also provided with a volume indication window, and the control structure 4 includes a volume adjustment knob. How to set the volume adjustment knob and the volume indication window is prior art and will not be described in detail here.

[0038] Finally, the pipette housing 1 is also provided with anti-slip convex patterns 11 to increase the friction when the user holds it.

[0039] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A pipette, comprising a pipette housing (1), a control structure (4) arranged in cooperation with the pipette housing (1), and a straw structure, wherein the control structure (4) is used to control the straw structure to absorb or dispense liquid; characterized in that: The straw structure comprises a straw connection portion (3) for detachably cooperating with a pipette tip (5); an embedding groove is provided on an outer peripheral wall of the straw connection portion (3); an annular sealing structure (31) is embedded in the embedding groove.

2. A pipette according to claim 1, characterized in that: The annular sealing structure (31) is an annular sealing ring, the outer surface of which is in contact with the inner wall of the pipette tip (5).

3. A pipette according to claim 1, characterized in that: The outer surface of the annular sealing structure (31) is flush with the outer peripheral wall of the straw connecting portion (3).

4. A pipette according to claim 1, characterized in that: The device also comprises a pipette tip ejection structure, the pipette tip ejection structure comprising a sleeve (2) sleeved outside the pipette structure, and a sleeve pressing portion (21) driving the sleeve (2) to slide axially, wherein the sleeve (2) is driven by the sleeve pressing portion (21) to slide axially and push the pipette tip (5) to separate it from the pipette connecting portion (3).

5. A pipette according to claim 1, characterized in that: The pipette tip (5) comprises a pointed mouth-shaped liquid suction portion (51), a tubular liquid storage cavity portion (52) and a pipette tip connecting portion (53) which are connected in sequence, and the inner wall of the pipette tip connecting portion (53) is tightly matched with the annular sealing structure (31) to achieve a detachable connection between the pipette tip (5) and the pipette structure.

6. A pipette according to claim 1, characterized in that: The outer end of the straw connecting portion (3) is a conical surface, and the annular sealing structure (31) is arranged on a side of the conical surface close to the pipette housing (1).

7. A pipette according to claim 1, characterized in that: The outer surface of the annular sealing structure (31) is provided with annular convex patterns.

8. A pipette according to claim 1, characterized in that: The pipette housing (1) is also provided with a volume indication window, and the control structure (4) comprises a volume adjustment knob.

9. A pipette according to claim 1, characterized in that: The pipette housing (1) is also provided with anti-slip convex patterns (11).

10. A pipette according to claim 5, characterized in that: The embedding groove comprises two first embedding grooves (311) and a second embedding groove (312) which are arranged at intervals, and a clamping groove (32) is provided between the first embedding groove (311) and the second embedding groove (312), an annular sealing ring is embedded in the first embedding groove (311) and the second embedding groove (312), an annular protrusion (531) is provided on the inner wall of the pipette tip connecting portion (53), the annular protrusion (531) cooperates with the clamping groove (32), and the pipette tip (5) is integrally formed.

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