CN2181331Y

CN2181331Y - Device for introducing liquid into pipet

Info

Publication number: CN2181331Y
Application number: CN93233231U
Authority: CN
Inventors: 陈方平
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-17
Filing date: 1993-02-17
Publication date: 1994-11-02
Anticipated expiration: 2003-02-17

Abstract

The utility model discloses a device sucking the liquid into a pipet, being a product made of the elastic high molecular materials. An air exhausting channel is arranged on a hollow ball, a one-way valve is arranged in the air exhausting channel, when the hollow ball is squeezed or released, the one-way valve can automatically open or close and the air is exhausted. An air sucking channel is arranged on the hollow ball, the air sucking channel connects with the pipet and the liquid is sucked into the pipet by the atmospheric pressure. A subchannel is arranged on the air sucking channel and the subchannel is used for controlling the lowing speed of the liquid level in the pipet to make the liquid level stay at the scale position of the pipet.

Description

Device for introducing liquid into pipet

The utility model is about general chemical laboratory equipment.

Pipette is the slender glass tube that has the both ends open of scale.In the chemical analysis test, be used for measuring exactly liquid.Need use ear washing bulb in the operating process sucks liquid in the pipette.Ear washing bulb is the device that is used to clean duct in the medical treatment, and it is a rubber system hollow ball, has a conical elongated blowing nozzle.The operating process of liquid is measured in following mask body narration with pipette: the pipette lower end is placed liquid, pinch flat ear washing bulb, the sharp tight-lipped pipette upper end of thickly inserting with ear washing bulb, loosen ear washing bulb gradually, liquid is sucked pipette, when liquid side is higher than scale, take away ear washing bulb, block the pipette upper end with finger rapidly, carefully loosen finger, make liquid level slowly drop to the scale place.Pipette is moved on in another container, decontrol finger, allow liquid flow out.In aforesaid operations, need to continue firmly, ear washing bulb point mouth is headed into the pipette upper end with strength, the outer surface of sharp mouth is closely contacted with the pipette inner surface, keep air-tightness.So easily make the people feel tired, when especially workload is big, tired more.Rely on finger to block and bring in speed and the position of stop, the relatively difficulty that the control liquid level descends on the pipette.If finger skin is comparatively moist, then be difficult to control the speed that liquid level falls, be difficult to drop to the scale place exactly, if finger skin is comparatively dry, then be difficult to stifled tight pipette upper end, liquid level can not stably rest on the scale place.The degree of accuracy of liquid is measured in influence.When the pipette volume is big, or liquid viscosity is when big, or fluid density often can not once be drawn onto liquid level on the scale when big.Because of ear washing bulb has only a passage, air inlet, giving vent to anger all must be by sharp mouth, so often need in the operating process: take away ear washing bulb, block the pipette upper end with finger, pinch flat ear washing bulb, again ear washing bulb point mouth is inserted the pipette upper end, inhale, repeatedly repeating this operation could be drawn onto liquid level on the scale again.Quite trouble is quite tired.

Develop this reality and novel purpose and be in order to make pipetting convenient, to reduce labor intensity, and improve the degree of accuracy of measuring liquid, increase work efficiency.

The utility model is achieved in that the hollow ball made from elastomeric material, and has and make in the ball and the extraneous passage that communicates, and formation sucks device in the pipette with liquid.This device has air intake passage and exhaust passage, and the inner surface of air intake passage lower end is up-small and down-big taper seat, has the subchannel on the air intake passage, and every passage all has and is used to open or the valve of closing passage, and the subchannel is positioned under the valve of air intake passage.If open the exhaust passage, pinch flat hollow ball, gas can be discharged from the ball.Open air intake passage again, because hollow ball has the trend of recovering original form under elastic reaction, the ball internal gas pressure descends, and outside air can be inhaled into.Open the subchannel, the following part of air intake passage valve is communicated with the external world.Because the inner surface of air intake passage lower end is up-small and down-big taper seat, when the pipette upper end was headed into the air intake passage lower end, air intake passage can be strutted, because elastic reaction, the inner surface of air intake passage contacts with the intimate of pipette, can play sealing function.

The utility model can be: the valve of exhaust passage is outwards to open the one-way cock of inwardly closing automatically.The valve of air intake passage and subchannel is the two way valve of manually opening or closing.One-way cock can be made up of a conical piston and a conical exhaust outlet that matches with it.When pinching flat hollow ball, the ball internal gas pressure is washed piston open and is made passage open-minded greater than ambient pressure, and when loosening hollow ball, piston is closely inhaled on conical exhaust outlet, stops up exhaust outlet, closing passage.One-way cock also can be had the hard tube of venthole and tightly is enclosed within on the hard tube and the elastic hose that covers venthole is formed by sealing of one one end opening one end and side.When pinching flat hollow ball, air-flow jack-up flexible pipe makes passage open-minded.When loosening hollow ball, the flexible pipe lock ring makes pathway closure on hard tube.Two way valve is made up of resilient channels and the solid ball of hard that is positioned at passage, and the diameter of ball is greater than the internal diameter of passage.The vias inner walls lock ring makes pathway closure on ball, make its distortion if squeeze passage with hand, and cross section is out of round, can make between the solid ball of vias inner walls and hard and produce the slit, makes passage open-minded.

The utility model can also be: the valve of exhaust passage is outwards to open the one-way cock of inwardly closing automatically, and the valve of air intake passage is inwardly to open the one-way cock of outwards closing automatically, and the valve of subchannel is the two way valve of manually opening or closing.The length at place, air intake passage lower end to subchannel can extend to 50～80 centimetres.

The utlity model has following characteristics: the inner surface of air intake passage lower end is a taper seat, and after pipette was headed into, the air intake passage lock ring made pipette and the device that liquid is sucked in the pipette closely link together on pipette.Therefore, the operator needn't continue with strength this device to be pressed on the pipette, can reduce labor intensity.Open the subchannel, the liquid level in the pipette can descend, and closes the subchannel, and then liquid level stops on some levels, utilizes the subchannel can control the speed that liquid level descends at an easy rate and makes it rest on the scale place exactly.Help improving the degree of accuracy of measuring liquid.In the time can not once being drawn onto liquid level on the scale, can gas in the hollow ball be discharged by the exhaust passage, continue to inhale.Repeated isolation be can remove like this from and pipette and the trouble that liquid is sucked the device in the pipette are connected.One-way cock is installed on the exhaust passage, is pinched flat or can open or close the exhaust passage automatically when loosening hollow ball, simplified operating procedure widely.After prolonging air intake passage, will hollow ball do not uphang to head with high position, only need to be placed on the desktop and operate, make the people feel lighter, help increasing work efficiency.

Fig. 1, basic block diagram of the present utility model.

Fig. 2, second kind of one-way cock schematic diagram of the present utility model.

The utility model is described in detail with embodiment below in conjunction with accompanying drawing.

Embodiment 1(is referring to accompanying drawing 1), 1, rubber system hollow ball, 2, the exhaust passage, 3, conical piston, 4, air intake passage, 5, the taper seat of air intake passage lower end.Because the external diameter of pipette is generally 6～9 millimeters, so the diameter at thin place should be greater than 5 millimeters for this taper seat, the diameter of thickness should be less than 10 millimeters.The length at place, air intake passage lower end to subchannel is 1.5～5 centimetres.6, subchannel, 7, constitute the solid ball of hard of air intake passage valve, its diameter is bigger 1 millimeter than air intake passage internal diameter.8, constitute the solid ball of hard of subchannel valve, its diameter is bigger 1 millimeter than subchannel internal diameter.The using method of the utility model embodiment 1 is: the taper seat 5 that the upper end of pipette is headed into the air intake passage lower end, pinch flat hollow ball 1, make the interior gas of ball wash piston 3 open, 2 discharge through the exhaust passage, loosen hollow ball 1, the pipette lower end placed treat the imbibition body, squeeze the valve 7 of air intake passage, open air intake passage, at this moment, hollow ball has the trend of recovering original form under elastic reaction, the ball internal gas pressure descends, and liquid is inhaled in the pipette.If can not once liquid level be drawn onto on the scale, can pinch flat hollow ball once more, discharge gas in the ball, continue to inhale, repeat this operation, be higher than scale until liquid level.Squeeze subchannel valve 8, open the subchannel, make the interior liquid level of pipette slowly drop to the scale place.Pipette is moved on in another container, take off liquid is sucked device in the pipette, allow liquid flow out.

Embodiment 2, and this routine exhaust passage is referring to accompanying drawing 2,9, venthole, and 10, the exhaust passage, 11, plastic rigid pipe.Other has one section rubber system flexible pipe (not drawing among the figure), and its internal diameter is littler 1 millimeter than the external diameter of hard tube 11, is enclosed within on the hard tube 11, and covers venthole 9.When pinching flat hollow ball, gas is with flexible pipe jack-up, and exhaust passage 10 is by open-minded, and when loosening hollow ball, the flexible pipe lock ring stops up venthole 9 on hard tube 11, and exhaust passage 10 is closed.The structure of practical example 2 other parts is identical with embodiment 1.Using method is also identical.

Embodiment 3, the valve of air intake passage adopts embodiment 1 or embodiment 2 described one-way cocks, its direction is closed for inwardly outwards opening automatically, and the valve of exhaust passage adopts embodiment 1 or embodiment 2 described one-way cocks, and its direction is closed for outwards inwardly opening automatically.The length at place, air intake passage lower end to subchannel is 50～80 centimetres.The structure of other parts is identical with embodiment 1.The using method of embodiment 3 is: the taper seat that the pipette upper end is headed into the air intake passage lower end, the pipette lower end placed treat the imbibition body, squeeze, loosen hollow ball repeatedly, when liquid level is higher than scale, squeeze the valve of subchannel, make the interior liquid level of pipette slowly drop to the scale place.Pipette is moved on in another container, emit liquid in pipe.

Claims

1, liquid is sucked device in the pipette, it is the hollow ball made from elastomeric material, have and make the passage that communicates with the external world in the ball, of the present utility model being characterised in that has air intake passage and exhaust passage, the inner surface of air intake passage lower end is up-small and down-big taper seat, have the subchannel on the air intake passage, all have on every passage and be used to open or the valve of closing passage.

2, device according to claim 1 is characterized in that used elastomeric material is a rubber.

3, device according to claim 1 is characterized in that the length at place, air intake passage lower end to subchannel is 1.5～5 centimetres or 50～80 centimetres.

4, device according to claim 1 is characterized in that valve can be the one-way cock of opening automatically or closing, and also can be the two way valve of manually opening or closing.

5, according to the described device of claim 4, it is characterized in that two way valve is made up of resilient channels and the solid ball of hard that is positioned at passage, the diameter of ball is greater than the internal diameter of passage.

6, device according to claim 4 is characterized in that one-way cock is made up of a pyramid type piston and the conical exhaust outlet that matches with it.

7, device according to claim 4 is characterized in that valve has the hard tube of venthole by sealing of one one end opening one end and side and is enclosed within on the hard tube and the elastic hose that covers venthole is formed.