Pipette capable of preventing suck-back

Abstract

The utility model belongs to the technical field of pipettes, and particularly relates to a pipette capable of preventing suck-back, which comprises a liquid storage component, a piston component and a limiting mechanism, the liquid storage component comprises a shell and a first piston rod hole, and the first piston rod hole is formed in the top of the shell; the piston component is arranged on the shell and comprises a piston rod, a piston, an end and a piston spring, the piston rod is inserted into the first piston rod hole, the piston is arranged at the lower end of the piston rod, the end is arranged at the upper end of the piston rod, and the piston spring is arranged on the piston rod at the lower end of the end in a sleeving mode; the limiting mechanism is arranged on the shell, the piston spring is arranged outside the shell, the piston spring is prevented from being soaked in liquid, liquid impurities attached to the piston spring are prevented from making contact with subsequent liquid, and pollution is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipette technology field, concretely is a pipette of preventing reverse suction. BACKGROUND

[0002] The existing pipette includes piston rod, piston, piston spring, pressure rod spring and T type pressure rod etc. parts, wherein the lower part of piston is connected with piston spring, and the piston spring is used for making piston reset, when absorbing solution, the piston is bounced up under the action of piston spring.

[0003] But in the existing pipette, the piston spring is located at the bottom of piston, when absorbing liquid on piston, liquid will contact with piston spring, after pipetting, liquid will adhere on piston spring, the next time pipetting, the liquid impurity adhered on piston spring will mix with new liquid, resulting in new liquid pollution, for this, the application proposes a pipette of preventing reverse suction. SUMMARY

[0004] This part aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract of the specification and the utility model name to avoid obscuring the purpose of this part, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above and / or the problems existing in the prior art, the utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a pipette of preventing reverse suction, the piston spring is arranged outside the shell, avoids the piston spring soaking in liquid inside, thereby preventing the liquid impurity adhered on piston spring from contacting subsequent liquid, avoids pollution.

[0007] To solve the above technical problems, according to one aspect of the utility model, the utility model provides the following technical scheme:

[0008] A pipette of preventing reverse suction, it includes:

[0009] Liquid storage component, including shell and first piston rod hole, the first piston rod hole is set up in the top of shell;

[0010] Piston component, is arranged on the shell, and the piston component includes piston rod, piston, end head and piston spring, the piston rod is inserted on the first piston rod hole, the lower end of piston rod is provided with piston, the upper end of piston rod is provided with end head, and the piston spring is sleeved on the piston rod of end head lower end;

[0011] Limiting mechanism, is arranged on the shell.

[0012] As a preferred scheme of the pipette gun capable of preventing reverse suction, the limiting mechanism comprises a slide rod, a frame body, a reset spring and a pressing plate, the slide rod is connected with the pressing plate at the left end thereof and extends out of the outer wall of the shell, the frame body is arranged at the right end of the slide rod and located outside the piston rod, and the reset spring is arranged between the right end of the frame body and the inner wall of the shell.

[0013] As a preferred scheme of the pipette gun capable of preventing reverse suction, the piston rod is provided with a rack, the shell is provided with a baffle, a second piston rod hole, a sliding groove and a movable hole, the baffle is arranged below the frame body, the second piston rod hole is arranged in the baffle and connected with the piston rod, and the movable hole is arranged in the side edge of the first piston rod hole and the second piston rod hole and corresponds to the rack.

[0014] As a preferred scheme of the pipette gun capable of preventing reverse suction, the top of the left side wall of the shell is provided with a baffle.

[0015] As a preferred scheme of the pipette gun capable of preventing reverse suction, the reset spring is clamped on the rack in a natural state.

[0016] As a preferred scheme of the pipette gun capable of preventing reverse suction, the outer side wall of the pressing plate is provided with uniformly distributed anti-skid protrusions.

[0017] As a preferred scheme of the pipette gun capable of preventing reverse suction, the front side wall of the shell is provided with a transparent window, and the transparent window is provided with a liquid level identification scale.

[0018] Compared with the prior art, the first piston rod hole is arranged on the shell, the piston rod is connected with the first piston rod hole, the piston spring is arranged at one end of the piston rod outside the shell, the piston spring does not contact with the liquid during pipetting, the liquid is prevented from adhering to the piston spring, the liquid impurities adhered to the piston spring are prevented from contacting with the subsequent liquid, and pollution is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the present application will be described in detail below in combination with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0020] Figure 1 It is a schematic diagram of the shaft side structure of the present application;

[0021] Figure 2The utility model discloses a liquid storage component structure schematic diagram.

[0022] Figure 3 The utility model discloses a piston component structure schematic diagram.

[0023] Figure 4 The utility model discloses a limiting mechanism structure schematic diagram.

[0024] In the drawing: 100 liquid storage component, 110 shell, 120 first piston rod hole, 130 baffle, 140 second piston rod hole, 150 sliding slot, 160 movable hole, 170 baffle, 200 piston component, 210 piston rod, 220 piston, 230 end, 240 piston spring, 250 rack, 300 limiting mechanism, 310 sliding rod, 320 frame, 330 return spring, 340 pressing plate. Specific embodiments

[0025] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent and easy to understand, the specific embodiments of the utility model are described in detail below with the accompanying drawings.

[0026] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the utility model, but the utility model can also be implemented in other ways different from the description, and those skilled in the art can make similar generalization without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0027] Secondly, the utility model is described in detail in combination with the schematic diagram, and when detailing the utility model embodiments, for the convenience of explanation, the sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of the utility model protection here. In addition, the three-dimensional spatial dimension of length, width and depth should be contained in actual manufacture.

[0028] In order to make the purpose, technical scheme and advantage of the utility model more clear, the embodiments of the utility model will be described in further detail below in combination with the drawings.

[0029] The utility model provides a prevent the pipette of sucking back, and the piston spring sets up in the shell outside, avoids the piston spring to soak in the liquid inside, thereby preventing the liquid impurity attached on the piston spring to contact the subsequent liquid, avoids the pollution, please refer to Figures 1-4 , including: liquid storage component 100, piston component 200 and limiting mechanism 300.

[0030] The liquid storage component 100 includes the shell 110 and the first piston rod hole 120, and the shell 110 top is provided with the first piston rod hole 120;

[0031] The shell 110 is hollow inside and used for accommodating the piston component 200.

[0032] The piston component 200 is arranged on the shell 110 and includes a piston rod 210, a piston 220, an end head 230 and a piston spring 240. The piston rod 210 is inserted into the first piston rod hole 120. The piston 220 is arranged at the lower end of the piston rod 210. The end head 230 is arranged at the upper end of the piston rod 210. The piston spring 240 is sleeved on the piston rod 210 at the lower end of the end head 230.

[0033] When the end head 230 is pressed down, the piston rod 210 drives the piston 220 to move upward. At this time, the piston spring 240 is continuously compressed, and the air inside the shell 110 is discharged. When the end head 230 is released, the piston spring 240 resets and drives the piston rod 210 to move upward, so that the piston 220 moves upward, the liquid is sucked into the shell 110, and the end head 230 is pressed again to make the piston 220 move downward to extrude the liquid, discharge the internal liquid, and complete the pipetting.

[0034] The limiting mechanism 300 is arranged on the shell 110 and used for limiting the piston rod 210 to avoid the movement of the piston rod 210.

[0035] Specifically, the limiting mechanism 300 includes a sliding rod 310, a frame 320, a reset spring 330 and a pressing plate 340. The left end of the sliding rod 310 extends out of the outer wall of the shell 110 and is connected to the pressing plate 340. The right end of the sliding rod 310 is arranged at the frame 320 outside the piston rod 210. The reset spring 330 is arranged between the right end of the frame 320 and the inner wall of the shell 110.

[0036] The pressing plate 340 is pressed to make the sliding rod 310 drive the frame 320 to move rightward. At this time, the reset spring 330 is compressed. When the pressing plate 340 is released, the frame 320 resets and moves leftward under the action of the reset spring 330.

[0037] In order to realize the limiting function of the limiting mechanism 300 and limit the piston rod 210, the piston rod 210 is provided with a rack 250. The shell 110 is provided with a partition plate 130, a second piston rod hole 140, a sliding groove 150 and a movable hole 160. The partition plate 130 is arranged below the frame 320. The second piston rod hole 140 connected to the piston rod 210 is arranged on the partition plate 130. The first piston rod hole 120 and the second piston rod hole 140 are both provided with the movable hole 160 corresponding to the rack 250.

[0038] The front and rear side width of the movable hole 160 is the same as that of the rack 250, and a gap is left between the right end of the movable hole 160 and the rack 250, which is used for air flow and balance of air pressure, and enables the movable hole 160 and the rack 250 to slide relative to each other. The piston rod 210 is connected to the sliding groove 150 through the rack 250, which ensures that the piston rod 210 does not rotate while moving up and down, avoids the rack 250 from being misaligned with the frame 320, and enables the frame 320 to contact the rack 250 for limiting.

[0039] Since the hand needs to hold outside the shell 110, and the smooth shell 110 is easy to slip off the hand, the baffle 170 is arranged at the top of the left side wall of the shell 110. After the hand is gripped, the baffle 170 is located on the upper part of the index finger, which avoids the shell 110 from slipping off the palm.

[0040] In order to limit the piston rod 210 in the natural straight state by the limiting mechanism 300, the frame 320 is clamped on the rack 250 in the natural state of the return spring 330, so that the pressing plate 340 needs to be pressed to drive the frame 320 to move right to cancel the limiting.

[0041] Since the pressing plate 340 is a flat plate, the index finger is easy to slip when pressed, so the anti-slip protrusions are evenly distributed on the outer side wall of the pressing plate 340 to improve the anti-slip effect and avoid the finger from slipping.

[0042] Since attention needs to be paid to the liquid volume during pipetting, in order to facilitate observation of the internal liquid volume, the transparent window is arranged on the front side wall of the shell 110, and the liquid level identification scale is arranged on the transparent window, so that the liquid volume sucked in the shell 110 can be read through the transparent window and the liquid level identification scale.

[0043] In specific use, the hand is gripped outside the shell 110, the index finger is pressed on the pressing plate 340, and the thumb is pressed on the top of the end 230. When pipetting is needed, the index finger is pressed on the pressing plate 340, the sliding rod 310 drives the frame 320 to move right, the frame 320 is separated from the rack 250 to cancel the limiting, then the end 230 is pressed down, the piston rod 210 drives the piston 220 to move down, at this time the piston spring 240 is continuously compressed to discharge the air in the shell 110, the end 230 is released, the piston spring 240 is reset to drive the piston rod 210 to move up, so that the piston 220 moves up to suck the liquid into the shell 110, when the liquid volume reaches, the index finger is released, the frame 320 moves left under the action of the return spring 330 to clamp the rack 250 for limiting, then the thumb is released, which does not cause the piston rod 210 to move, and it is not necessary to press all the time. When the liquid is discharged, the pressing plate 340 is pressed to cancel the limiting of the frame 320, and the end 230 is pressed again to make the piston 220 move down to press the liquid, so that the internal liquid is discharged, and the pipetting is completed. During the pipetting process, the piston spring 240 does not contact the liquid, which prevents the liquid impurities attached to the piston spring from contacting the subsequent liquid to avoid pollution.

[0044] Although the utility model has been described above with reference to the embodiments, various modifications can be made to it and equivalent components can be substituted for those therein without departing from the scope of the utility model. In particular, the features of the embodiments disclosed by the utility model can be combined with each other in any manner as long as there is no structural conflict, and the combinations are not exhaustively described in the specification only for the consideration of omitting the length and saving the resources. Therefore, the utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pipette for preventing siphoning, characterized in that The utility model relates to a liquid storage device, which comprises a liquid storage component (100) and a piston component (200). The liquid storage component (100) comprises a shell (110) and a first piston rod hole (120), and the first piston rod hole (120) is formed in the top of the shell (110). The piston component (200) is arranged on the shell (110) and comprises a piston rod (210), a piston (220), an end head (230), and a piston spring (240). The piston rod (210) is inserted into the first piston rod hole (120), the lower end of the piston rod (210) is provided with the piston (220), the upper end of the piston rod (210) is provided with the end head (230), and the piston spring (240) is sleeved on the piston rod (210) at the lower end of the end head (230).

2. A pipette according to claim 1, characterized in that The limiting mechanism (300) is arranged on the shell (110).

3. A pipette according to claim 2, wherein The limiting mechanism (300) comprises a slide rod (310), a frame (320), a reset spring (330), and a pressing plate (340).

4. The anti-pipetting pipette of claim 1, wherein, The left end of the slide rod (310) extends out of the outer wall of the shell (110) and is connected to the pressing plate (340), the right end of the slide rod (310) is provided with the frame (320) outside the piston rod (210), and the reset spring (330) is arranged between the right end of the frame (320) and the inner wall of the shell (110).

5. The anti-pipetting pipette of claim 3, wherein, The side wall of the piston rod (210) is provided with a rack (250), the shell (110) is provided with a baffle (130), a second piston rod hole (140), a sliding groove (150), and a movable hole (160), the baffle (130) is arranged below the frame (320), the second piston rod hole (140) connected to the piston rod (210) is formed in the baffle (130), and the first piston rod hole (120) and the second piston rod hole (140) are both provided with the movable hole (160) corresponding to the rack (250).

6. The anti-pipetting pipette of claim 2, wherein, The top of the left side wall of the shell (110) is provided with a baffle (170).

7. The anti-pipetting pipette of claim 1, wherein, In the natural state of the reset spring (330), the frame (320) is clamped on the rack (250). The outer side wall of the pressing plate (340) is provided with uniformly distributed anti-skid protrusions. The front side wall of the shell (110) is provided with a transparent window, and the transparent window is provided with a liquid level identification scale.

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