Pipette with backflow prevention function

Abstract

The utility model relates to the technical field of pipettes, and discloses a pipette with an anti-backflow function, which comprises a pipette main body, a connecting cover is in threaded connection with an inner cavity of the pipette main body close to the top end, a through hole is formed in the top of the connecting cover, a vertical rod movably penetrates through the top of the through hole, and a pull rod is fixedly mounted at the top end of the vertical rod. A limiting assembly is arranged at the position, close to the top end, of the rear side of the vertical rod, a piston block is arranged at the bottom end of the vertical rod, a limiting block is fixedly installed at the top end of the piston block, and a limiting groove is formed in the bottom of the vertical rod. The pull rods can be pulled towards the two sides so that the mounting blocks fixed to the adjacent pull rods can move towards the far sides, then the inserting blocks fixed to the mounting blocks can be far away from the inner cavities of the adjacent inserting grooves, the piston blocks can be conveniently detached, follow-up replacement of the piston blocks is facilitated, and therefore backflow of chemical liquid can be prevented, and the service life of the chemical liquid is prolonged. And the use safety of the pipette main body is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipette technical field, concretely is a kind of anti-return function pipette. BACKGROUND

[0002] In the process of drug inspection and detection, a pipette is used when sampling liquid reagent. The conventional pipette sucks solvent sample by creating negative pressure through ear ball suction at the gas outlet of the pipette.

[0003] When using the pipette to take pressure of chemical liquid, the piston block is easily worn after multiple uses, and thus the pipette cannot always be in a negative pressure state during the pulling process, so the chemical liquid in the pipette is prone to backflow, which causes pollution on the ground.

[0004] Therefore, we propose an anti-return function pipette to solve the problems mentioned above. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide an anti-return function pipette to solve the problems mentioned in the background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an anti-return function pipette, comprising a pipette main body, a connecting cover is threadedly connected to the inner cavity of the pipette main body near the top end, a through hole is formed in the top of the connecting cover, a vertical rod is movably inserted into the top of the through hole, a pulling rod is fixedly installed at the top end of the vertical rod, a limiting assembly is arranged at the top end of the rear side of the vertical rod, a piston block is arranged at the bottom end of the vertical rod, a limiting block is fixedly installed at the top end of the piston block, a limiting slot is formed in the bottom of the vertical rod, and the limiting block is movably inserted into the inner cavity of the limiting slot, and a disassembly assembly is arranged between the vertical rod and the limiting block.

[0007] The disassembly assembly comprises slots formed in the inner cavities of the limiting slots on both sides and a fixed plate fixedly installed in the inner cavities of the adjacent slots near the middle position at the bottom, pull rods are movably inserted into the opposite sides of the fixed plate, mounting blocks are fixedly installed at the opposite ends of the pull rods, plug blocks are fixedly installed at the opposite sides of the mounting blocks, and slots are formed in the sides of the limiting block.

[0008] Preferably, compression telescopic rods are fixedly installed at the opposite sides of the mounting blocks near the top and the bottom, the opposite ends of the compression telescopic rods are fixedly connected to the adjacent fixed plates, compression springs are movably sleeved around the outer peripheries of the compression telescopic rods, and the two ends of the compression springs are fixedly connected to the mounting blocks and the fixed plates.

[0009] Preferably, the limiting assembly comprises a fixed block fixedly installed at the top of the connecting cover near the rear side and a threaded pipe movably penetrating through the front side of the fixed block, the rear end of the threaded pipe is fixedly installed with an anti-skid knob, the inner cavity of the threaded pipe is threadedly connected with a threaded rod, the front end of the threaded rod is fixedly installed with a movable plate, and the front side of the movable plate is fixedly installed with a clamping block.

[0010] Preferably, the rear side of the movable plate is fixedly installed with a limiting telescopic rod near both sides, and the rear side of the limiting telescopic rod is fixedly connected with the fixed block.

[0011] Preferably, the outer periphery of the pipette body is fixedly sleeved with a plurality of anti-skid pads near the top end, and the outer periphery of the pipette body is provided with a scale line near the bottom end.

[0012] Preferably, the rear side of the stand is provided with a plurality of clamping grooves, the clamping block is movably inserted into the inner cavities of adjacent clamping grooves, the two sides of the stand are fixedly installed with sliding strips, the inner cavities of the through holes are provided with recesses at both sides, and the sliding strips are movably inserted into the inner cavities of adjacent recesses, respectively.

[0013] Preferably, the plurality of clamping grooves are linearly arranged from top to bottom.

[0014] Compared with the prior art, the pipette body has the advantages that:

[0015] 1. When the piston block is replaced, the installation block fixedly installed on the adjacent pull rod can be moved away from the side under the cooperation of the disassembling assembly, the plug block fixedly installed on the installation block can be moved away from the inner cavity of the adjacent plug slot, the piston block can be conveniently disassembled, the piston block can be conveniently replaced, the backflow of the chemical liquid can be prevented, and the safety of the pipette body in use can be improved.

[0016] 2. When the stand is limited, the clamping block can be movably inserted into the inner cavities of adjacent clamping grooves under the action of the limiting assembly, the height of the pulled-out stand can be limited, and the chemical liquid can be prevented from being squeezed out and dropped on other areas to cause pollution due to accidental contact of the stand by the staff. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole three-dimensional structure schematic view of the utility model;

[0018] Figure 2 It is a sectional three-dimensional structure schematic view of the utility model;

[0019] Figure 3 It is another perspective view of the utility model, and it is a sectional three-dimensional structure schematic view;

[0020] Figure 4 It is an explosion view of the connecting cover and the pipette of the utility model.

[0021] Figure 5 It is partial sectional view schematic diagram of the piston block and the limiting block of the utility model;

[0022] Figure 6 It is partial sectional view schematic diagram of the piston block and the limiting block of the utility model; Figure 4 It is enlarged view of A in the middle;

[0023] Figure 7 It is partial sectional view schematic diagram of the piston block and the limiting block of the utility model; Figure 5 It is enlarged view of B in the middle;

[0024] Figure 8 It is partial sectional view schematic diagram of the piston block and the limiting block of the utility model; Figure 7 It is enlarged view of C in the middle.

[0025] In the drawing: 1, pipette main body;11, non-slip pad;12, scale line;2, connecting cover;3, vertical rod;31, clamping groove;32, groove;33, sliding bar;4, piston block;5, pull rod;6, limiting block;7, limiting assembly;71, fixed block;72, threaded tube;73, non-slip knob;74, threaded rod;75, movable plate;751, limiting telescopic rod;76, clamping block;8, disassembly assembly;81, plug-in block;82, mounting block;821, compression telescopic rod;822, compression spring;83, pull rod;84, slot;85, fixed plate;9, through hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] Embodiment 1

[0028] Please refer to Figures 1-8 , a kind of anti-reflux function pipette, including pipette main body 1, the inner cavity of pipette main body 1 is close to top end place and is connected with connecting cover 2, the top of connecting cover 2 is provided with through hole 9, through hole 9 top is movably penetrated with vertical rod 3, the top end of vertical rod 3 is fixedly installed with pull rod 5, pull rod 5 has the function of anti-slip, the rear side of vertical rod 3 is close to top end place and is provided with limiting assembly 7, the bottom of vertical rod 3 is provided with piston block 4, the top end of piston block 4 is fixedly installed with limiting block 6, the bottom of vertical rod 3 is provided with limiting slot, and limiting block 6 is movably inserted in the inner cavity of limiting slot, and disassembly assembly 8 is arranged between vertical rod 3 and limiting block 6;

[0029] The disassembling assembly 8 comprises slotted holes 84 arranged at both sides of the inner cavity of the limiting groove and a fixed plate 85 fixedly installed at the inner cavity bottom of the adjacent slotted hole 84 near the middle position. The opposite side of the fixed plate 85 movably penetrates a pull rod 83, and the opposite end of the pull rod 83 is fixedly installed with a mounting block 82. The opposite side of the mounting block 82 is fixedly installed with an insertion block 81. The two sides of the limiting block 6 are provided with insertion slots, and the insertion block 81 is movably inserted into the inner cavity of the adjacent insertion slot.

[0030] Specifically, when the piston block 4 is replaced, under the cooperation of the disassembling assembly 8, pulling the pull rod 83 to the two sides can make the mounting block 82 fixedly installed on the adjacent pull rod 83 move to the opposite side, and then the insertion block 81 fixedly installed on the mounting block 82 can move away from the inner cavity of the adjacent insertion slot, thereby facilitating the disassembly of the piston block 4, facilitating the subsequent replacement of the piston block 4, thereby preventing the backflow of the chemical liquid and improving the safety of the use of the pipette body 1.

[0031] The opposite side of the mounting block 82 is fixedly installed with a compression telescopic rod 821 near the top and the bottom. The opposite end of the compression telescopic rod 821 is fixedly connected with the adjacent fixed plate 85. The outer periphery of the compression telescopic rod 821 movably sheaths a compression spring 822, and the two ends of the compression spring 822 are fixedly connected with the mounting block 82 and the fixed plate 85.

[0032] Specifically, the compression telescopic rod 821 and the compression spring 822 can stably insert the insertion block 81 into the inner cavity of the insertion slot.

[0033] Embodiment 2

[0034] This embodiment is an improvement on the basis of embodiment 1. Specifically, please refer to Figure 1 、 Figure 4 and Figure 6 The limiting assembly 7 comprises a fixed block 71 fixedly installed on the top of the connecting cover 2 near the rear side and a threaded pipe 72 movably penetrating the front side of the fixed block 71. The rear end of the threaded pipe 72 is fixedly installed with an anti-skid knob 73. The inner cavity of the threaded pipe 72 is threadedly connected with a threaded rod 74. The front end of the threaded rod 74 is fixedly installed with a movable plate 75. The front side of the movable plate 75 is fixedly installed with a clamping block 76.

[0035] Specifically, when the vertical rod 3 is limited, under the action of the limiting assembly 7, the clamping block 76 can be movably inserted into the inner cavity of the adjacent clamping groove 31, the height of the pulled-out vertical rod 3 can be limited, and the accidental accidental touching of the vertical rod 3 by the staff can be avoided to cause the chemical liquid to be squeezed out and dropped on other areas to cause pollution.

[0036] The rear side of the movable plate 75 is fixedly provided with limiting telescopic rods 751 near both sides, and the rear side of the limiting telescopic rods 751 is fixedly connected with the fixed block 71 near both sides.

[0037] Specifically, the limiting telescopic rods 751 can limit the movement of the movable plate 75.

[0038] The outer periphery of the pipette body 1 is fixedly provided with several anti-skid pads 11 near the top end, and the outer periphery of the pipette body 1 is provided with scale lines 12 near the bottom end.

[0039] Specifically, the anti-skid pads 11 can prevent the user's hands from slipping, and the scale lines 12 can observe the amount of liquid drawn into the inner cavity of the pipette body 1.

[0040] The rear side of the vertical rod 3 is provided with several clamping grooves 31, and the clamping blocks 76 are movably inserted into the inner cavities of adjacent clamping grooves 31. The vertical rod 3 is fixedly provided with sliding strips 33 on both sides, and the inner cavities of the through holes 9 are provided with recesses 32 on both sides. The sliding strips 33 are movably inserted into the inner cavities of adjacent recesses 32, respectively.

[0041] Specifically, the recesses 32 and the sliding strips 33 can limit the movement of the vertical rod 3.

[0042] The several clamping grooves 31 are linearly arranged from top to bottom.

[0043] Working principle: when using, one end of the pipette main body 1 is inserted in the inner cavity of the chemical container, the operator can hold the outer periphery of the pipette main body 1 with one hand, and the other hand pulls the vertical rod 3 upwards through the pulling rod 5, so that the piston block 4 can be moved upwards, and then the chemical liquid in the chemical container can be sucked into the inner cavity of the pipette main body 1, the amount of suction can be observed through the setting of the scale line 12, after the appropriate amount is sucked, the anti-skid knob 73 can be rotated at this time, the threaded tube 72 fixed on the anti-skid knob 73 can be rotated, the threaded rod 74 threaded in the inner cavity of the threaded tube 72 can make the movable plate 75 be limited under the limiting of the two limiting telescopic rods 751, the clamping block 76 fixed on the movable plate 75 can be inserted in the inner cavity of the adjacent clamping groove 31, the height of the pulled vertical rod 3 can be limited, accidental accidental bumping of the vertical rod 3 by the staff can be avoided, the chemical liquid is squeezed out, and the pollution caused by dropping in other areas, when the piston block 4 needs to be replaced, the connecting cover 2 can be rotated out from the inner cavity of the pipette main body 1 at this time, then the vertical rod 3 is taken out from the inner cavity of the pipette main body 1, then the pull rod 83 is pulled to the side away, the mounting block 82 fixed on the adjacent pull rod 83 can be moved to the side away, so that the plug block 81 fixed on the mounting block 82 can be away from the inner cavity of the adjacent insertion slot, the piston block 4 can be conveniently taken down and replaced, so that the backflow of the chemical liquid can be prevented, and the safety of the use of the pipette main body 1 is improved.

[0044] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0045] Although the utility model 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 embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An anti-backflow function pipette comprising a pipette body (1), characterized in that: The inner cavity of the pipette body (1) is threadedly connected with a connecting cover (2) near the top end, a through hole (9) is formed in the top of the connecting cover (2), a vertical rod (3) is movably penetrated through the top of the through hole (9), a pull rod (5) is fixedly installed at the top end of the vertical rod (3), a limiting assembly (7) is arranged at the rear side of the vertical rod (3) near the top end, a piston block (4) is arranged at the bottom end of the vertical rod (3), a limiting block (6) is fixedly installed at the top end of the piston block (4), a limiting groove is formed in the bottom of the vertical rod (3), and the limiting block (6) is movably inserted into the inner cavity of the limiting groove. The dismounting assembly (8) comprises a slot (84) formed at both sides of the inner cavity of the limiting groove and a fixed plate (85) fixedly installed at the inner cavity bottom of the adjacent slot (84) near the middle position, a pull rod (83) is movably penetrated through the opposite side of the fixed plate (85), an installation block (82) is fixedly installed at the opposite end of the pull rod (83), an insertion block (81) is fixedly installed at the opposite side of the installation block (82), and an insertion slot is formed at both sides of the limiting block (6), and the insertion block (81) is movably inserted into the inner cavity of the adjacent insertion slot.

2. A reverse flow prevention function pipette according to claim 1, characterized in that: The opposite sides of the installation block (82) are fixedly installed with compression telescopic rods (821) near the top and the bottom, the opposite ends of the compression telescopic rods (821) are fixedly connected with the adjacent fixed plates (85), compression springs (822) are movably sleeved on the outer periphery of the compression telescopic rods (821), and the two ends of the compression springs (822) are fixedly connected with the installation block (82) and the fixed plate (85).

3. A reverse flow prevention function pipette according to claim 1, characterized in that: The limiting assembly (7) comprises a fixed block (71) fixedly installed at the top of the connecting cover (2) near the rear side and a threaded pipe (72) movably penetrated through the front side of the fixed block (71), an anti-skid knob (73) is fixedly installed at the rear end of the threaded pipe (72), a threaded rod (74) is threadedly connected in the inner cavity of the threaded pipe (72), an activity plate (75) is fixedly installed at the front end of the threaded rod (74), and a clamping block (76) is fixedly installed at the front side of the activity plate (75).

4. A reverse flow prevention function pipette according to claim 3, characterized in that: The rear side of the activity plate (75) is fixedly installed with limiting telescopic rods (751) near the two sides, and the rear side of the limiting telescopic rods (751) is fixedly connected with the fixed block (71) near the two sides.

5. A reverse flow prevention function pipette according to claim 1, characterized in that: A plurality of anti-skid pads (11) are fixedly sleeved on the outer periphery of the pipette body (1) near the top end, and a scale line (12) is arranged on the outer periphery of the pipette body (1) near the bottom end.

6. A reverse flow prevention function pipette according to claim 1, characterized in that: A plurality of clamping grooves (31) are formed in the rear side of the vertical rod (3), and the clamping block (76) is movably inserted into the inner cavity of the adjacent clamping groove (31), sliding bars (33) are fixedly installed at both sides of the vertical rod (3), recesses (32) are formed in the inner cavities of both sides of the through hole (9), and the sliding bars (33) are movably penetrated through the inner cavities of the adjacent recesses (32).

7. A reverse flow prevention function pipette according to claim 6, characterized in that: The plurality of clamping grooves (31) are linearly arranged from top to bottom.

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