Transfer pipette capable of preventing suck-back

Abstract

The utility model belongs to the field of laboratory instruments, particularly relates to an anti-suck-back pipette, and aims to solve the problems that the liquid can be accurately discharged only by properly controlling the movement of fingers during liquid discharge, the control operation of the fingers is high in difficulty and difficult to control, and the excessive liquid discharge is not accurate enough in the prior art. According to the technical scheme, the ear washing tube comprises a tube body, a liquid transferring cavity and an anti-suck-back cavity are formed in the tube body, an upper opening and a liquid suction opening are formed in the two ends of the tube body respectively, the upper opening is used for allowing a tip opening of an ear washing bulb to be inserted in a matched mode, and the liquid suction opening is used for facilitating liquid suction. When the transfer pipette is used and the transfer pipette is used for draining liquid, the liquid is not required to be drained by controlling the movement of fingers, so that the control operation difficulty of the fingers is high, the control is difficult, the phenomenon that the liquid is not accurately drained enough is avoided, and the convenience degree and the applicability of the transfer pipette are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory instruments, in particular to a pipette with anti-backflow suction prevention. Background Art

[0002] A pipette is a precision instrument commonly used in laboratories to measure the volume of liquids accurately. It is widely used in experimental operations in fields such as chemistry, biology, and medicine. The design and manufacture of pipettes have very strict requirements to ensure the accuracy and repeatability of liquid measurement;

[0003] Currently, when most pipettes are in use, the pointed end of the rubber bulb is inserted into the upper opening of the pipette, and after sucking in the liquid, the upper opening is quickly blocked with a finger. Finally, after the pipette is held vertically, the finger is slowly released to discharge the liquid in order to achieve the pipetting effect. However, there are the following deficiencies in the liquid discharging process:

[0004] Since appropriate control of finger movement is required during liquid discharging to accurately discharge the liquid volume, and the control operation of the finger is difficult and hard to grasp, it is easy to have the phenomenon that too much liquid is discharged inaccurately, thereby reducing the convenience and applicability of use;

[0005] In view of the above problems, the present utility model document proposes a pipette with anti-backflow suction prevention. Summary of the Utility Model

[0006] The utility model provides a pipette with anti-backflow suction prevention, which solves the deficiencies in the prior art that appropriate control of finger movement is required during liquid discharging to accurately discharge the liquid volume, and the control operation of the finger is difficult and hard to grasp, it is easy to have the phenomenon that too much liquid is discharged inaccurately, thereby reducing the convenience and applicability of use.

[0007] The utility model provides the following technical solutions:

[0008] A pipette with anti-backflow suction prevention, comprising:

[0009] A tube body, inside which a liquid transfer cavity and an anti-backflow suction prevention cavity are respectively arranged. The two ends of the tube body are respectively provided with an upper opening and a liquid suction port. The upper opening is used for the pointed end of the rubber bulb to be inserted in a fitting manner, and the liquid suction port is used for conveniently sucking liquid;

[0010] A control mechanism, which is arranged at the top of the tube body and is used for precisely controlling the discharged amount of the liquid.

[0011] In a possible design, the control mechanism includes a connecting head, a plugging head, two pull handles, a through hole, a rotating groove, a rotating cover, a handle and an angle line. The connecting head is fixedly arranged on the outer wall of the top end of the tube body. The connecting head is communicated with the liquid transfer cavity and the anti-backflow cavity. The plugging head is hermetically clamped inside the connecting head for hermetically plugging the connecting head.

[0012] In a possible design, the through hole is opened at the top of the plugging head. The through hole is communicated with the connecting head. The rotating groove is opened at the top side of the plugging head. The rotating cover is rotatably connected to the bottom side of the inner wall of the rotating groove through a damping rotating shaft for controlling the plugging of the through hole.

[0013] In a possible design, the angle line is arranged at the top side of the plugging head for the corresponding adjustment of the rotating cover.

[0014] In a possible design, the two pull handles are both fixedly arranged on the top side of the plugging head for facilitating the taking of the plugging head. The handle is fixedly arranged on the top side of the rotating cover for facilitating the rotation of the rotating cover.

[0015] In a possible design, scale lines are arranged on the outer wall of the tube body.

[0016] In this application, during use, first, the tube body serves as the main part of the pipette. The inside is divided into a liquid transfer cavity and an anti-backflow cavity. The liquid transfer cavity is used for storing and transferring the liquid to be tested or added. The anti-backflow cavity is designed to prevent the liquid from flowing back into the pipette from the liquid suction port under specific conditions such as sudden pressure changes, protecting the instrument and the sample from contamination. The liquid suction port is located at one end of the tube body, directly contacting the liquid to be transferred, facilitating the user's liquid suction operation. The upper mouth is located at the other end of the tube body and is designed to be inserted in a fitting manner with the tip of the rubber bulb. By squeezing the rubber bulb to generate negative pressure, the liquid can be sucked into the liquid transfer cavity from the liquid suction port, so as to achieve the effect of liquid transfer. The connecting head is fixedly arranged on the outer wall of the top end of the tube body, serving as the connection channel between the liquid transfer cavity and the external environment, and at the same time being communicated with the anti-backflow cavity to ensure the air pressure balance of the system. After the liquid enters the liquid transfer cavity, quickly use the pull handle to hermetically clamp the plugging head inside the connecting head, so as to seal the connecting head under normal conditions and prevent the leakage of liquid or gas;

[0017] When liquid needs to be discharged, a through-hole is opened at the top of the plugging head as the liquid discharge channel, which is connected to the connector and the pipetting chamber. The rotating groove is opened on the top side of the plugging head, and a rotating cover connected by a damping rotating shaft is installed inside. The damping rotating shaft rotates in the rotating groove to achieve precise control of the through-hole. Then, the user can rotate the rotating cover as needed to adjust the area covering the through-hole, thereby effectively controlling the liquid discharge volume. The design of the damping rotating shaft makes the rotation of the rotating cover stable and easy to control, avoiding liquid splashing caused by too fast operation. Angle lines are set on the top side of the plugging head to provide an intuitive reference for the user. The user can accurately adjust the rotation angle of the rotating cover according to the indication of the angle lines, thereby achieving precise control of the liquid discharge volume and improving the convenience of operation. The handle is fixedly set on the top side of the plugging head, facilitating the user to pick up and fix the plugging head, while the knob is fixedly set on the top side of the rotating cover, making it convenient for the user to rotate the rotating cover and improving the convenience and comfort of operation.

[0018] In the present utility model, for the pipette with anti-backflow, through the arrangement of structures such as the connector, the plugging head and the handle, the connector can be sealed under normal conditions to prevent liquid or gas leakage, so as to facilitate subsequent precise control of the liquid, and there is no need to block it with fingers anymore.

[0019] In the present utility model, for the pipette with anti-backflow, through the arrangement of structures such as the through-hole, the rotating groove, the rotating cover and the angle lines, the rotating cover can be rotated as needed to adjust the area covering the through-hole, thereby effectively controlling the liquid discharge volume, avoiding liquid splashing caused by too fast operation, and at the same time being able to accurately adjust the rotation angle of the rotating cover, so as to achieve precise control of the liquid discharge volume.

[0020] In the present utility model, when the pipette discharges liquid, there is no need to discharge liquid by controlling the movement of fingers anymore, which is beneficial to preventing the high difficulty of finger control operation and being difficult to grasp, avoiding the phenomenon that the liquid discharge is inaccurate, and thus improving the convenience and applicability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view structural schematic diagram of a pipette with anti-backflow provided by an embodiment of the present utility model;

[0022] Figure 2 It is the structural schematic diagram of the split state of the plugging head of a pipette with anti-backflow provided by an embodiment of the present utility model;

[0023] Figure 3 It is the structural schematic diagram of the rotating state of the rotating cover of a pipette with anti-backflow provided by an embodiment of the present utility model;

[0024] Figure 4Schematic cross-sectional structure diagram of the pipette body for preventing backflow according to an embodiment of the present utility model.

[0025] Reference numerals:

[0026] 1, pipette body; 2, liquid transfer cavity; 3, anti-backflow cavity; 4, scale line; 5, connector; 6, plugging head; 7, handle; 8, through hole; 9, rotation groove; 10, rotating cover; 11, handle; 12, angle line. Specific implementation manners

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0028] Embodiment 1

[0029] Please refer to Figures 1-4 , a pipette, comprising:

[0030] The pipette body 1, the inside of the pipette body 1 is respectively provided with a liquid transfer cavity 2 and an anti-backflow cavity 3. The pipette body 1 serves as the main part of the pipette, and the inside is divided into the liquid transfer cavity 2 and the anti-backflow cavity 3. The liquid transfer cavity 2 is used to store and transfer the liquid to be tested or added, while the anti-backflow cavity 3 is designed to prevent the liquid from flowing back into the pipette from the liquid suction port in case of sudden pressure change, protecting the instrument and the sample from contamination. The two ends of the pipette body 1 are respectively provided with an upper port and a liquid suction port. The upper port is used for the pointed end of the rubber bulb to be inserted in a fitting manner. The upper port is designed to be inserted in a fitting manner with the pointed end of the rubber bulb. By squeezing the rubber bulb to generate negative pressure, the liquid can be sucked into the liquid transfer cavity 2 from the liquid suction port, so as to achieve the liquid transfer effect. The liquid suction port is used to facilitate the suction of the liquid. The liquid suction port is located at one end of the pipette body 1, directly contacting the liquid to be transferred, facilitating the user's liquid suction operation.

[0031] The control mechanism, the control mechanism is arranged at the top end of the pipette body 1 for precisely controlling the discharge amount of the liquid. The control mechanism includes a connector 5, a plugging head 6, two handles 7, a through hole 8, a rotation groove 9, a rotating cover 10, a handle 11 and an angle line 12. The connector 5 is fixedly arranged on the outer wall of the top end of the pipette body 1. The connector 5 is communicated with the liquid transfer cavity 2 and the anti-backflow cavity 3. The connector 5 is fixedly arranged on the outer wall of the top end of the pipette body 1, serving as the connection channel between the liquid transfer cavity 2 and the external environment, and is also communicated with the anti-backflow cavity 3 to ensure the air pressure balance of the system. The plugging head 6 is hermetically clamped inside the connector 5 for hermetically plugging the connector 5. After the liquid enters the liquid transfer cavity 2, quickly use the handle 7 to hermetically clamp the plugging head 6 inside the connector 5, so as to hermetically seal the connector 5 under normal conditions and prevent the leakage of liquid or gas.

[0032] The through hole 8 is opened at the top of the plug 6. The through hole 8 communicates with the connecting head 5. The rotating groove 9 is opened at the top side of the plug 6. The rotating cover 10 is rotatably connected to the bottom side of the inner wall of the rotating groove 9 through a damping rotating shaft for controlling the blocking of the through hole 8. By virtue of the through hole 8 being opened at the top of the plug 6, and the rotating groove 9 being opened at the top side of the plug 6, with the rotating cover 10 connected by a damping rotating shaft installed inside, the damping rotating shaft rotates in the rotating groove 9 to achieve precise control of the through hole 8. Then, the user can rotate the rotating cover 10 as needed to adjust the area covering the through hole 8, thereby effectively controlling the discharge amount of the liquid.

[0033] The angle line 12 is arranged at the top side of the plug 6 for the corresponding adjustment of the rotating cover 10. The angle line 12 is arranged at the top side of the plug 6 to provide an intuitive reference for the user. The user can accurately adjust the rotation angle of the rotating cover 10 according to the indication of the angle line 12, thereby achieving precise control of the liquid discharge amount.

[0034] This application can be used in the field of laboratory instruments and also in other fields applicable to this application.

[0035] Embodiment 2

[0036] Reference Figures 1-4 , based on the improvement of Embodiment 1: A pipette for preventing backflow, which is applied to the field of laboratory instruments;

[0037] Both of the two handles 7 are fixedly arranged at the top side of the plug 6 for facilitating the taking of the plug 6. The handles 7 are fixedly arranged at the top side of the plug 6 to facilitate the user to take and fix the plug 6. The handle 11 is fixedly arranged at the top side of the rotating cover 10 for facilitating the rotation of the rotating cover 10. The handle 11 is fixedly arranged at the top side of the rotating cover 10 to facilitate the user to rotate the rotating cover 10 and improve the convenience and comfort of the operation.

[0038] The outer wall of the tube body 1 is provided with scale lines 4. Reading the scale lines 4 on the outer wall of the tube body 1 is beneficial to confirming whether the liquid volume in the liquid transfer cavity 2 meets the requirements and controlling the liquid volume.

[0039] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model; without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A pipette that prevents backflow, characterized in that, Comprising: A tube body (1), with a pipetting cavity (2) and an anti-backflow cavity (3) respectively arranged inside the tube body (1). The two ends of the tube body (1) are respectively provided with an upper opening and a liquid suction opening. The upper opening is used for the tip of an ear syringe to be inserted in a fitting manner, and the liquid suction opening is used for conveniently sucking liquid; A control mechanism, which is arranged at the top of the tube body (1) for precisely controlling the discharge amount of the liquid.

2. The pipette for preventing backflow according to claim 1, wherein, The control mechanism includes a connector (5), a plugging head (6), two handles (7), a through hole (8), a rotating groove (9), a rotating cover (10), a handle (11) and an angle line (12). The connector (5) is fixedly arranged on the outer wall of the top of the tube body (1). The connector (5) is communicated with the pipetting cavity (2) and the anti-backflow cavity (3). The plugging head (6) is hermetically clamped inside the connector (5) for hermetically plugging the connector (5).

3. The pipette for preventing backflow according to claim 2, characterized in that, The through hole (8) is opened at the top of the plugging head (6), and the through hole (8) is communicated with the connector (5). The rotating groove (9) is opened on the top side of the plugging head (6). The rotating cover (10) is rotatably connected to the bottom side of the inner wall of the rotating groove (9) through a damping rotating shaft for controlling the plugging of the through hole (8).

4. The pipette for preventing backflow according to claim 3, characterized in that, The angle line (12) is arranged on the top side of the plugging head (6) for the corresponding adjustment of the rotating cover (10).

5. The pipette for preventing backflow according to claim 4, characterized in that, The two handles (7) are both fixedly arranged on the top side of the plugging head (6) for conveniently taking the plugging head (6). The handle (11) is fixedly arranged on the top side of the rotating cover (10) for conveniently rotating the rotating cover (10).

6. The pipette for preventing backflow according to claim 1, characterized in that, The outer wall of the tube body (1) is provided with a scale line (4).

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