Liquid suction device for chemical analysis

Abstract

The utility model discloses a liquid suction device for chemical analysis, which belongs to the technical field of liquid suction devices and comprises a metering cylinder, the bottom end of the metering cylinder is fixedly connected with a threaded pipe, the outer side of the threaded pipe is in threaded connection with an extension pipe, the interior of the metering cylinder is slidably connected with a piston block, and the top end of the piston block is rotatably connected with an adjusting screw rod. The adjusting screw is in threaded connection with the top end of the metering cylinder, the top end of the adjusting screw is fixedly connected with a knob, one side of the metering cylinder is provided with a vacuum assembly, the side wall of the metering cylinder is fixedly connected with oppositely-arranged nut blocks, the inner sides of the nut blocks are in threaded connection with supporting screws, and the bottom ends of the supporting screws are rotationally connected with suction cups. By arranging the adjusting screw rod, the piston block and the vacuum assembly, the liquid pumping capacity in the metering cylinder can be adjusted in advance by utilizing the adjusting screw rod to be matched with the piston block, then the interior of the metering cylinder is vacuumized by utilizing the micro vacuum pump, and finally, the blocking valve is opened, so that the function of automatically and quantitatively sucking liquid can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid pipettes, in particular to a liquid pipette for chemical analysis. Background Art

[0002] In chemical industry, chemical analysis laboratories and other analytical and testing technology application fields, it is often necessary to use a pipette to quantitatively transfer liquid for analysis and testing, and an auxiliary pipette is needed to transfer the liquid;

[0003] The prior art patent (patent number: 201822034585.5, patent name: A pipette for chemical analysis) is provided with a movable rod, a piston, a pipette and a pipette. The movable rod drives the piston to move, and the liquid can be sucked out with the pipette;

[0004] However, the above-mentioned technical patent has the following defects: (1) during the above-mentioned use, the user needs to hold the device in hand, and at the same time needs to control the moving distance of the piston with the other hand to control the amount of liquid extracted, which increases the burden on the hand and makes the hand shake easily when driving the piston to move, resulting in insufficient or excessive liquid extraction; (2) the length of the pipette is fixed and cannot be applied to bottles of different depths. Therefore, a pipette for chemical analysis is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the problems in the prior art and provides a liquid pipette for chemical analysis.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid pipette for chemical analysis comprises a metering cylinder, the bottom end of which is fixedly connected to a threaded tube, a sealing valve is provided on the threaded tube, an extension tube is threadedly connected to the outer side of the threaded tube, a piston block is slidably connected to the inside of the metering cylinder, an adjusting screw is rotatably connected to the top end of the piston block, the adjusting screw is threadedly connected to the top end of the metering cylinder, a knob is fixedly connected to the top end of the adjusting screw, a vacuum assembly is provided on one side of the metering cylinder, a nut block is fixedly connected to the side wall of the metering cylinder, a support screw is threadedly connected to the inner side of the nut block, and a suction cup is rotatably connected to the bottom end of the support screw.

[0008] Preferably, a relatively arranged clamping block is fixedly connected to the surface of the extension tube, and a magnetic sealing cover is sleeved on the surface of the clamping block.

[0009] Preferably, the inner wall of the magnetic sealing cover is provided with a slot for engaging with the engaging block, and the magnetic sealing cover and the bottom end of the metering cylinder are magnetically attracted to each other.

[0010] Preferably, the vacuum assembly includes a micro vacuum pump and a vacuum tube, the vacuum end of the micro vacuum pump is fixedly connected to the vacuum tube, one end of the vacuum tube is fixedly connected to the metering cylinder, and a placement seat is installed at the bottom end of the vacuum tube.

[0011] Preferably, a sealing valve is provided on the vacuum tube, a pressure relief pipe is fixedly connected to the side wall of the vacuum tube, and a balancing valve is provided on the pressure relief pipe.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model is provided with an adjusting screw, a piston block and a vacuum assembly. The adjusting screw and the piston block can be used to adjust the internal liquid extraction capacity of the metering cylinder in advance, and then the inside of the metering cylinder is evacuated by a micro vacuum pump, and finally the sealing valve is opened to realize the automatic quantitative absorption function of the liquid.

[0014] 2. The utility model is provided with an extension tube, a threaded tube and a magnetic sealing cover, and utilizes the card groove on the inner side of the magnetic sealing cover to engage with the card block, so that the extension tube can be rotated, and then the overall length of the threaded tube and the extension tube can be adjusted, which is convenient for adapting to bottles of different depths. At the same time, the magnetic sealing cover can realize the sealing function of the bottle mouth, and prevent external dust from entering the bottle during the suction process.

[0015] 3. The utility model is provided with a nut block, a support screw and a suction cup, and the support screw is used to drive the suction cup to move downward, and the suction cup is adsorbed on the desktop to achieve the placement function of the device, so that the device does not need to be held by hand, reducing the burden on the hands. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a liquid pipette for chemical analysis proposed by the utility model;

[0017] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of a liquid pipette for chemical analysis proposed by the utility model;

[0019] Figure 4 The utility model provides a schematic diagram of the connection structure of a threaded tube, an extension tube and a magnetic sealing cover in a pipette for chemical analysis.

[0020] In the figure: 1. Measuring cylinder; 2. Mini vacuum pump; 3. Placement seat; 4. Suction cup; 5. Support screw; 6. Extension tube; 7. Clamp block; 8. Nut block; 9. Adjustment screw; 10. Piston block; 11. Threaded tube; 12. Magnetic sealing cover; 13. Vacuum tube; 14. Pressure relief tube. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with 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 of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] Reference Figure 1-4 A liquid pipette for chemical analysis comprises a metering cylinder 1, the surface of which is provided with a metering scale, a threaded tube 11 fixedly connected to the bottom end of the metering cylinder 1, a blocking valve provided on the threaded tube 11, an extension tube 6 threadedly connected to the outer side of the threaded tube 11, the extension tube 6 rotates to realize the movement function of the extension tube 6, and then the overall length of the threaded tube 11 and the extension tube 6 is adjusted, so as to be suitable for bottles of different depths; a piston block 10 is slidably connected to the inside of the metering cylinder 1, the top end of the piston block 10 is rotatably connected to an adjusting screw 9, the adjusting screw 9 is threadedly connected to the top end of the metering cylinder 1, and the adjusting screw 9 The top of the metering cylinder 1 is fixedly connected with a knob, and the knob is used to drive the adjusting screw 9 to rotate, thereby driving the piston block 10 to move, so as to adjust the amount of liquid extracted from the metering cylinder 1; a vacuum component is provided on one side of the metering cylinder 1, and the vacuum component can realize the vacuum function in the metering cylinder 1; the side wall of the metering cylinder 1 is fixedly connected with a nut block 8 arranged oppositely, and the inner side of the nut block 8 is threadedly connected with a support screw 5, and the bottom end of the support screw 5 is rotatably connected with a suction cup 4, and the suction cup 4 is driven downward by the support screw 5, and the suction cup 4 is adsorbed on the desktop to realize the placement function of the device, so that there is no need to hold the device, thereby reducing the burden on the hands.

[0023] Furthermore, a relatively arranged clamping block 7 is fixedly connected to the surface of the extension tube 6, a magnetic sealing cover 12 is sleeved on the surface of the clamping block 7, a clamping groove for clamping the clamping block 7 is provided on the inner wall of the magnetic sealing cover 12, and the magnetic sealing cover 12 and the bottom end of the metering cylinder 1 are magnetically attracted to each other;

[0024] It should be noted that the extension tube 6 is driven to rotate by the magnetic sealing block, so as to avoid the user from manually touching the extension tube 6, thereby preventing the extension tube 6 from contaminating the liquid;

[0025] It is worth noting that the magnetic sealing cover 12 and the bottom end of the metering cylinder 1 are magnetically attracted to each other, so that the magnetic sealing cover 12 can be temporarily placed when the magnetic sealing cover 12 is not in use.

[0026] It should be noted that the magnetic sealing cover 12 can achieve the function of sealing the bottle mouth when sucking liquid, thereby preventing external dust from entering the bottle body.

[0027] Further, the vacuum assembly includes a micro vacuum pump 2 and a vacuum tube 13, the vacuum end of the micro vacuum pump 2 is fixedly connected to the vacuum tube 13, one end of the vacuum tube 13 is fixedly connected to the metering cylinder 1, and a placement seat 3 is installed at the bottom end of the vacuum tube 13;

[0028] It should be noted that the micro vacuum pump 2 can be used to achieve the vacuum function inside the metering cylinder 1 .

[0029] Furthermore, a sealing valve is provided on the vacuum tube 13, a pressure relief tube 14 is fixedly connected to the side wall of the vacuum tube 13, and a balancing valve is provided on the pressure relief tube 14;

[0030] It should be noted that the sealing valve can close the vacuum tube 13 after the vacuuming function of the metering cylinder 1 is realized to prevent liquid from entering the micro vacuum pump 2. The setting of the balance valve facilitates the discharge of residual liquid in the threaded tube 11 and the extension tube 6.

[0031] When the utility model is in use, according to the amount of liquid to be extracted, the adjusting screw 9 is rotated to drive the piston block 10 to move up, and the extraction capacity of the liquid in the measuring cylinder 1 can be adjusted according to the measuring scale on the surface of the measuring cylinder 1. After the adjustment is completed, the blocking valve and the balancing valve are closed, the sealing valve is opened, and the micro vacuum pump 2 is turned on, so that the measuring cylinder 1 can be evacuated. After the evacuation is completed, according to the depth of the medicine bottle, the magnetic suction sealing cover is moved so that the card groove on the inner side is engaged with the card connection block 7, and then the magnetic sealing cover 12 is rotated, and the magnetic suction sealing cover drives the extension tube 6 to rotate, and then the overall length of the threaded tube 11 and the extension tube 6 is adjusted to be suitable for bottles of different depths, and then the extension tube 6 and the threaded tube 11 are extended into the bottle body, and at the same time, the magnetic sealing cover 12 can be used to realize the blocking function of the bottle mouth, so as to prevent external dust from entering the bottle body during the suction process, and then the support screw 5 is used to drive the suction cup 4 to move downward, and the suction cup 4 is used to be adsorbed on the desktop to realize the placement function of the device, so that there is no need to hold the device, which reduces the burden on the hands;

[0032] Finally, open the blocking valve so that the extension tube 6 and the threaded tube 11 can absorb the liquid in the bottle body. After the absorption is completed, take out the extension tube 6 and insert it into the volumetric flask for storing liquid. Rotate the adjusting screw 9 again and use the piston block 10 to squeeze the liquid in the metering cylinder 1 and squeeze the liquid into the volumetric flask. Due to the influence of negative pressure, liquid will remain in the extension tube 6 and the threaded tube 11. At this time, open the balance valve and rotate the adjusting screw 9 at the same time to drive the piston block 10 to move upward. When the piston block 10 moves to above the vacuum tube 13, under the action of the pressure relief tube 14, the air pressure inside and outside the metering cylinder 1 is balanced, so that the residual liquid in the extension tube 6 and the threaded tube 11 drips into the volumetric flask under the action of gravity, thereby ensuring the adequacy of liquid recovery.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipette for chemical analysis, comprising a measuring cylinder (1), characterized in that: The bottom end of the metering cylinder (1) is fixedly connected to a threaded tube (11), a blocking valve is provided on the threaded tube (11), an extension tube (6) is threadedly connected to the outside of the threaded tube (11), a piston block (10) is slidably connected to the inside of the metering cylinder (1), an adjusting screw (9) is rotatably connected to the top of the piston block (10), the adjusting screw (9) is threadedly connected to the top of the metering cylinder (1), a knob is fixedly connected to the top of the adjusting screw (9), a vacuum assembly is provided on one side of the metering cylinder (1), a nut block (8) arranged oppositely is fixedly connected to the side wall of the metering cylinder (1), a support screw (5) is threadedly connected to the inside of the nut block (8), and a suction cup (4) is rotatably connected to the bottom end of the support screw (5).

2. A chemical analysis pipette according to claim 1, characterized in that: A relatively arranged clamping block (7) is fixedly connected to the surface of the extension tube (6), and a magnetic sealing cover (12) is sleeved on the surface of the clamping block (7).

3. A chemical analysis pipette according to claim 2, characterized in that: The inner wall of the magnetic sealing cover (12) is provided with a slot for engaging with the engaging block (7), and the magnetic sealing cover (12) and the bottom end of the metering cylinder (1) are magnetically attracted to each other.

4. A chemical analysis pipette according to claim 1, characterized in that: The vacuum assembly comprises a micro vacuum pump (2) and a vacuum tube (13); the vacuum end of the micro vacuum pump (2) is fixedly connected to the vacuum tube (13); one end of the vacuum tube (13) is fixedly connected to the metering cylinder (1); and a placement seat (3) is installed at the bottom end of the vacuum tube (13).

5. A chemical analysis pipette according to claim 4, characterized in that: The vacuum tube (13) is provided with a sealing valve, the side wall of the vacuum tube (13) is fixedly connected with a pressure relief tube (14), and the pressure relief tube (14) is provided with a balancing valve.

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