CN2560925Y

CN2560925Y - Titration liquid-transfer measuring instrument

Info

Publication number: CN2560925Y
Application number: CN 02263540
Authority: CN
Inventors: 季克和
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-06
Filing date: 2002-08-06
Publication date: 2003-07-16
Anticipated expiration: 2012-08-06

Abstract

The utility model belongs to a liquid metering device and relates to a titration and pipette metering device, comprising a liquid storage tube, a middle sleeve, a piston and a post rod. a scale disc is sleeved on a external circle on an upper end of the middle sleeve, the scale disc is in running fit with the middle sleeve, an external wall of the scale disc is marked with scales and is opposite to a pointer on the external wall of the middle sleeve; an external thread and a vertical guide limit slot are arranged on the external wall of the post rod, a fixed limit pin is fixedly positioned on the scale disc in radial direction, a front end of the fixed limit pin is inserted in the guide limit slot; an elastic screw thread matched with the screw thread on the post rod is disposed on the side wall of a central hole on an upper part of the middle sleeve; a radial movable limit pin is arranged on a base body of the tube well of the middle sleeve and the front end of the movable limit pin can be inserted in a guide limit slot on the post rod. The utility model has precision of titration and pipette and is not severely impacted by the operator error.

Description

Titration, move the liquid gauge

Technical field

The utility model belongs to liquid metering device, relates to a kind of titration, moves the liquid gauge.

Background technology

Existing titration, liquid-transfering device, general utility functions are more single, titration, the precision of moving liquid are lower, and the error of titration, the operation that moves operator in the process of liquid, range estimation to titration, move liquid the precision influence very big.

Summary of the invention

Technical problem to be solved in the utility model is, a kind of titration is provided, move liquid the precision height, be subjected to operate miss to influence little titrator.

Titrator of the present utility model includes liquid storage pipe that is positioned at the lower end and the middle sleeve that is fixedly connected with the liquid storage pipe upper end, there is a piston to cooperate with liquid storage pipe, there is a push rod piston top, this push rod is applied in the center pit on middle sleeve top, it is characterized in that, on the excircle of middle sleeve upper end, be with a scale dish, be rotatably assorted between scale dish and the middle sleeve, the scale dish can be rotated on middle sleeve, scale dish outer wall is marked with scale, and it is corresponding with the pointer on being fixed on the middle sleeve outer wall; On the described push rod outer wall external thread is arranged, on the push rod outer wall, also has a guide and limit groove longitudinally, on the scale dish, radially be fixed with a fixedly spacer pin, fixedly the front end of spacer pin just is inserted in the above-mentioned guide and limit groove, push rod can together be rotated with the scale dish, and fixedly spacer pin can be made relative straight line and moves up and down in the guide and limit groove simultaneously; On the sidewall in middle sleeve central upper portion hole, have a through hole radially, in radial direction through hole, be equipped with one with push rod on the elasticity thread of threads engaged, on the screw thread that the adjusting knob and the stage clip of elasticity thread by its afterbody is crushed on push rod, the tooth top of this thread is at the width of the circumferencial direction width greater than above-mentioned guide and limit groove; A movable spacer pin radially also is installed on the tube wall matrix of described middle sleeve, and the front end of movable spacer pin can insert in the guide and limit groove on the push rod.

The utility model has reduced operate miss greatly owing to control vertically moving of push rod by the threaded engagement anglec of rotation between push rod and the elasticity thread, has improved the titration precision.And the elastic construction that the elasticity thread has makes it can indentation backward under the pressure at right angle of push rod, and making push rod can be unit stepping vertically downward with pitch, thereby realizes high-precision repetition liquid feeding and move liquid, and easy to operate.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is that the A of Fig. 1 is to the partial structurtes synoptic diagram;

Fig. 3 is the local structure for amplifying synoptic diagram on middle sleeve top.

Embodiment

As shown in Figure 1 and Figure 2, titrator of the present utility model lower end is that liquid storage pipe 1, liquid storage pipe upper end connect with middle sleeve 2, and piston 3 cooperates with liquid storage pipe, and stage clip 4 is installed between piston and the middle sleeve, and the piston top is a push rod 5.On middle sleeve 2 tops a scale dish 6 is installed, cooperates by ball between scale dish and the middle sleeve, the scale dish can be rotated on middle sleeve; On push rod 5 outer walls external thread is arranged, on the push rod outer wall, also has a guide and limit groove 8 longitudinally, on the scale dish, radially be fixed with a fixedly spacer pin 9, fixedly the front end of spacer pin is inserted in the guide and limit groove 8, push rod 5 can together rotate with scale dish 6, and fixedly spacer pin 9 can be made linear relative movement in guide and limit groove 8 simultaneously; On the sidewall in middle sleeve central upper portion hole 7, have a through hole radially, in radial direction through hole, be equipped with one with push rod on the elasticity thread 10 of threads engaged, the elasticity thread is crushed on the screw thread of push rod by the adjusting knob 11 and the stage clip 12 of its afterbody, and the tooth top of elasticity thread is at the width of the circumferencial direction width greater than guide and limit groove 8; A movable spacer pin 13 radially also is installed on the tube wall matrix of middle sleeve 2, and the front end of movable spacer pin can be inserted in the guide and limit groove 8 on the push rod.

When carrying out titration operation, movable spacer pin 13 on the middle sleeve is outwards extracted from guide and limit groove 8, at this moment, rotation scale dish 6 rotates push rod 5 thereupon, because push rod cooperates with elastic thread, make push rod upper and lower motion simultaneously, the scale dish push rod that whenever rotates a circle moves a pitch, thereby can accurately control titration process.

When needs move liquid and repeat the liquid feeding operation, movable spacer pin 13 on the middle sleeve is inserted forward in the guide and limit groove 8 of push rod, push rod and scale dish can't be rotated, vertically press push rod this moment again, whenever press push rod once, can elasticity thread 10 is once extrapolated, the push rod pitch that can descend can realize high-precisionly moving liquid and repeating the liquid feeding operation thus.

Claims

1, a kind of titration, moves the liquid gauge, include liquid storage pipe (1), middle sleeve (2), piston (3) and push rod (5), it is characterized in that: on the excircle of middle sleeve (2) upper end, be with a scale dish (6), be rotatably assorted between scale dish and the middle sleeve; On the outer wall of described push rod (5) external thread is arranged, also have a guide and limit groove (8) longitudinally on the push rod outer wall, radially be fixed with a fixedly spacer pin (9) on the scale dish, fixedly the front end of spacer pin is inserted in the guide and limit groove (8); On the sidewall in middle sleeve (2) central upper portion hole (7), have a through hole radially, in radial direction through hole, be equipped with one with push rod (5) on the elasticity thread (10) of threads engaged, the elasticity thread is crushed on the screw thread of push rod by the adjusting knob (11) and the stage clip (12) of its afterbody, and the tooth top of elasticity thread is at the width of the circumferencial direction width greater than guide and limit groove (8); A movable spacer pin (13) radially also is installed on the tube wall matrix of middle sleeve (2), and the front end of movable spacer pin can insert in the guide and limit groove (8) on the push rod.