CN2447765Y

CN2447765Y - Pipet

Info

Publication number: CN2447765Y
Application number: CN 00221663
Authority: CN
Inventors: 王振明; 徐渭渔; 林贤刚
Original assignee: Suzhou Jiemei Electronic Co ltd
Current assignee: Suzhou Jiemei Electronic Co ltd
Priority date: 2000-09-05
Filing date: 2000-09-05
Publication date: 2001-09-12
Anticipated expiration: 2010-09-05

Abstract

The utility model relates to a liquid transferring device, which comprises a shell body, a piston, and a piston driving rod for driving the piston to move. An inner cavity is arranged in the shell body. A liquid suction tip can be sheathed on the lower end of the shell body, and the interior of the liquid suction tip and the inner cavity are communicated. The piston is arranged in the inner cavity, and can be slid in the inner cavity. The liquid transferring device is characterized in that a gear is also arranged on the upper part of the inner cavity of the shell body. The center of the gear is provided with a hole, and is provided with an inner thread. A gear operation hole is arranged on the shell body. A thread is arranged on the upper part of the piston driving rod, and is matched with the inner thread of the gear. The liquid transferring device has the advantages that the liquid transferring device can be used for automatic control liquid sample making equipment, when sampling, liquid only enters a liquid suction tip which can be replaced, and the liquid does not enter the inner cavity of the liquid transferring device. The liquid transferring device is particularly suitable for making batch liquid samples.

Description

Pipettor

The utility model relates to a kind of fluid sampling device, is specifically related to the pipettor that uses on a kind of automatic sample device.

When biochemistry, immunization experiment and microchemical analysis, need carry out quantitative liquid feeding to various chemical reagent, biopreparate, sterile preparation, radioactive isotope and infectiousness, toxicity and corrosive liquids, and usually need to produce more in large quantity various laboratory samples.Commonly used is that manual precision is moved the liquid measure tool at present, comprise housing, piston, the piston actuated bar of driven plunger motion and accurate manually quantitative stop means, be fixed with push rod on the piston, push rod top is provided with and pushes away the end fixed cover, push away end fixed cover below and be provided with retracing spring, piston actuated bar lower end with push away the end fixed cover contact, the upper end passes housing and is provided with manual button, during use, put the imbibition point of certain specification as required in the housing lower end, adjust manually quantitative stop means to desired value, press the piston actuated bar, piston moves downward the discharge air, after the imbibition point immerses liquid, loosen the piston actuated bar, piston makes progress resilience and sucks quantitative liquid under the effect of retracing spring; Another kind is that pump suction type is controlled pipettor automatically, utilizes the quantitative imbitition of suction pumps of control automatically during sampling, injects sample hose from the other end.Preceding a kind of structure has quantitatively accurately, sampling liquid only enters the imbibition point, only need change the advantage of imbibition point when taking a sample again, but shortcoming is manual operation, each sampling all will be adjusted the quantitative stop means of sampling, uses trouble, particularly prepares sample more for a long time, the manual operation workload is very big, and easily loosens the different quantitative errors that cause of key scroll because of hand; A kind of structure in back can realize automatic control, and in batches operation is simpler during sample preparation, but pump suction type sampling liquid is through stopple coupon, need clean stopple coupon when changing sample, cleaning does not totally easily pollute, even cleaned up, may cause sample concentration generation deviation because of residual water yet.Therefore, need a kind of liquid sample making apparatus that can control automatically at present, this equipment can not adopt pump suction type work, thereby correspondingly needs a kind of pipettor that can control automatically.

The utility model purpose provides a kind of pipettor that is used in the liquid sample making apparatus of automatic control, and liquid only enters removable imbibition point during sampling, and does not enter the pipettor inner chamber.

For achieving the above object, the technical solution adopted in the utility model is: a kind of pipettor, the piston actuated bar that comprises housing, piston and driven plunger motion, be provided with inner chamber in the described housing, the housing lower end can sheathed imbibition point and imbibition point inside and described intracavity inter-connection, described piston is located in the inner chamber, and can be in interior slip, the inner chamber top of described housing also is provided with gear, gear central authorities are porose and be provided with internal thread, have the operated gear hole on the housing, described piston actuated bar top is provided with screw thread and matches with the internal thread of gear.

In the technique scheme, described " the housing lower end can sheathed imbibition point and imbibition point inside and described intracavity inter-connection " is meant the removable imbibition point of existing hand pipettor use, this imbibition point is a hollow structure, utilize friction force to be set in the lower end of pipettor housing, middle vacancy communicates with the inner chamber of pipettor, thereby the vacsorb liquid that can utilize the inner chamber piston motion to form.Described " piston actuated bar top is provided with screw thread and matches with the internal thread of gear " is meant that the piston actuated bar is provided with screw thread and constitutes screw rod, form the structure that is similar to worm and gear with the internal thread of gear, when gear rotates, can drive the piston actuated bar and move up and down.

In the technique scheme, the structure of piston actuated bar driven plunger motion has two kinds at least, a kind of is to fixedly connected with piston in the lower end of described piston actuated bar, rotate by gear to drive the piston actuated bar that is provided with screw thread and move up and down, and directly driven plunger motion; Another kind of scheme is: also be provided with the push rod of fixedlying connected with piston, push rod top is provided with and pushes away the end fixed cover, push away end fixed cover below and be provided with retracing spring, described piston actuated bar lower end with push away the end fixed cover contact, when gear driven piston actuated bar moves downward, the lower end of piston actuated bar pushes away the end fixed cover, and then promotion descent of piston, when gear driven piston actuated bar moves upward, under the effect of retracing spring, pushing away the end fixed cover, to be close to the piston actuated bar up, thereby drive upstroke.

Further technical scheme, described inner walls vertically is provided with chute, is fixed with sliding pin on the piston actuated bar, and an end of sliding pin can slide up and down in chute.The upper end of described piston actuated bar is fixedly connected with extension bar, and described case top is provided with the hole, and described extension bar passes from the hole, and the upper end of extension bar is provided with light barrier.

In the technique scheme, described gear by bearing fixing on housing.

In the technique scheme, described housing top is respectively equipped with locating slot and holding tank, and the left and right sides, described housing top is provided with location structure, and described location structure can be a groove, also can be projection.

Further technical scheme can be, described housing comprises upper shell and lower house, fixedly connected by threaded coupling sleeve, the cavity of described piston motion is positioned at lower house, described gear is by the inner chamber of Bearing Installation in upper shell, the inwall of described upper shell vertically is provided with chute, is fixed with sliding pin on the piston actuated bar, and an end of sliding pin can slide up and down in chute.

The utility model principle of work is: the utility model is actually the parts on a kind of dosing sample making apparatus of automatic control, on automatic sample equipment, the driven wheel of numerical control can be set, this driven wheel is meshed by the operated gear hole with the gear on this pipettor housing top, thereby can utilize the rotation of cnc mechanism control gear, and then the distance that moves up and down of control piston driving stem, the amount of the liquid of also just having determined suction or having emitted, the principle of piston actuated bar driven plunger motion illustrates in technique scheme.Can take off the imbibition point by screens is set on automatic control equipment, thereby not need the imbibition point to be set and shirk mechanism as manual pipettor.Do not rotate when guaranteeing that the piston actuated bar moves up and down, vertically be provided with chute, carry out spacing the direction of motion of piston actuated bar in inner walls; The needs that zero-bit is determined during for automatic control utilize extension bar to add light barrier in the upper end of piston actuated bar, are used for detecting automatically position of piston, and automatic testing method is not limited in light barrier, also can in the piston motion chamber pressure transducer be set.For automatic control equipment change automatically pipettor needs (as the pipettor of high viscosity liquid with the pipettor of liquid slightly different), be provided with locating slot on the top of housing and be used to hang pipettor, both sides are provided with the location structure that cooperates with suspension place and are used for fixing pipettor, are provided with the engagement that holding tank is used for mechanical arm clamping pipettor and guarantees driven wheel in addition.

Because the technique scheme utilization, the utility model compared with prior art has following advantage:

1, because the utility model has adopted the structure of the internal thread drive screw of gear, and making automatic control move liquid becomes possibility, sample preparation has fabulous effect for batch.

2, because the utility model adopts easily changeable imbibition point to move liquid, avoided the secondary pollution of original pump suction type automatic equipment, cleaned difficulty and cleaned ponding influencing problems such as concentration, expanded range of application greatly.

3, the utility model has designed structures such as light barrier, locating slot and holding tank, is convenient to use on automatic control equipment.

Accompanying drawing 1 is the structure cross-sectional schematic of the utility model embodiment one;

Accompanying drawing 2 is that the A of Fig. 1 is to view.

Wherein: [1], upper shell; [2], lower house; [3], coupling sleeve; [4], piston; [5], piston actuated bar; [6], inner chamber; [7], gear; [8], operated gear hole; [9], screw thread; [10], push rod; [11], push away the end fixed cover; [12], retracing spring; [13], bearing; [14], chute; [15], sliding pin; [16], extension bar; [17], hole; [18], light barrier; [19], locating slot; [20], holding tank.

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one: referring to attached illustrated in figures 1 and 2, a kind of pipettor, comprise upper shell 1, lower house 2, the piston actuated bar 5 of piston 4 and driven plunger 4 motions, 2 of upper shell 1 and lower houses are fixedlyed connected by threaded coupling sleeve 3, on described, be provided with inner chamber 6 in the lower house, lower house 2 lower ends can sheathed imbibition point and imbibition point inside be connected with described inner chamber 6, described piston 4 is located in the inner chamber 6 of lower house 2, and can be in interior slip, be fixedly connected with push rod 10 on the piston 4, push rod 10 tops are provided with and push away end fixed cover 11, push away end fixed cover 11 belows and be provided with retracing spring 12, inner chamber 6 tops of described upper shell 1 also are provided with gear 7, gear 7 is fixed on the upper shell 1 by bearing 13, and gear 7 central authorities are porose and be provided with internal thread, have operated gear hole 8 on the upper shell 1, described piston actuated bar 5 tops are provided with screw thread 9 and match with the internal thread of gear 7, piston actuated bar 5 lower ends with push away the end fixed cover 11 contact; Described upper shell 1 inwall vertically is provided with chute 14, be fixed with sliding pin 15 on the piston actuated bar 5, one end of sliding pin 15 can slide up and down in chute 14, the upper end of described piston actuated bar 5 is fixedly connected with extension bar 16, described upper shell 1 top is provided with hole 17, described extension bar 16 passes from hole 17, and the upper end of extension bar 16 is provided with light barrier 18; Described upper shell 1 top is respectively equipped with locating slot 19 and holding tank 20, and the left and right sides, upper shell 1 top is provided with location structure, and described location structure can be a groove, also can be projection.

Present embodiment is provided with lower house, can utilize the parts such as lower house, piston, push rod and coordination spring of former hand pipettor, and is comparatively convenient during enforcement.

Embodiment two: referring to a kind of pipettor of embodiment one, wherein piston actuated bar 5 is longer, and the first half is provided with screw thread 9, directly fixedlys connected with piston 4 in the lower end, thereby has omitted parts such as pushing away end fixed cover 11, retracing spring 12, and material cost is lower.During use, transmitting gear 7 makes the 5 upper and lower motions of piston actuated bar, directly drives piston 4 motions.

Claims

1, a kind of pipettor, the piston actuated bar [5] that comprises housing, piston [4] and driven plunger [4] motion, be provided with inner chamber [6] in the described housing, the housing lower end can sheathed imbibition point and imbibition point inside be connected with described inner chamber [6], described piston [4] is located in the inner chamber [6], and can be in interior slip, it is characterized in that: the inner chamber of described housing [6] top also is provided with gear [7], gear [7] central authorities are porose and be provided with internal thread, have operated gear hole [8] on the housing, described piston actuated bar [5] top is provided with screw thread [9] and matches with the internal thread of gear [7].

2, pipettor as claimed in claim 1 is characterized in that: fixedly connected with piston [4] in the lower end of described piston actuated bar [5].

3, pipettor as claimed in claim 1, it is characterized in that: also be provided with the push rod [10] of fixedlying connected with piston [4], push rod [10] top is provided with and pushes away end fixed cover [11], push away end fixed cover [11] below and be provided with retracing spring [12], described piston actuated bar [5] lower end holds fixed cover [11] to contact with pushing away.

4, as the described pipettor of claim 1 to 3, it is characterized in that: described inner walls vertically is provided with chute [14], is fixed with sliding pin [15] on the piston actuated bar [5], and an end of sliding pin [15] can slide up and down in chute [14].

5, pipettor as claimed in claim 4, it is characterized in that: the upper end of described piston actuated bar [5] is fixedly connected with extension bar [16], described case top is provided with hole [17], and described extension bar [16] passes from hole [17], and the upper end of extension bar [16] is provided with light barrier [18].

6, pipettor as claimed in claim 1 is characterized in that: described gear [7] is fixed on the housing by bearing [13].

7, pipettor as claimed in claim 1 is characterized in that: described housing top is respectively equipped with locating slot [19] and holding tank [20].

8, pipettor as claimed in claim 7 is characterized in that: the left and right sides, described housing top is provided with location structure, and described location structure can be a groove, also can be projection.

9, pipettor as claimed in claim 1, it is characterized in that: described housing comprises upper shell [1] and lower house [2], fixedly connected by threaded coupling sleeve [3], the cavity of described piston [4] motion is positioned at lower house [2], described gear [7] is installed on the inner chamber [6] of upper shell [1] by bearing [13], the inwall of described upper shell [1] vertically is provided with chute [14], is fixed with sliding pin [15] on the piston actuated bar [5], and an end of sliding pin [15] can slide up and down in chute [14].