CN212681038U

CN212681038U - Accurate constant volume device and volumetric flask thereof

Info

Publication number: CN212681038U
Application number: CN202021065741.5U
Authority: CN
Inventors: 辛子岩; 李慧杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-03-12
Anticipated expiration: 2030-06-11

Abstract

The utility model discloses an accurate constant volume device and volumetric flask thereof, both equipment uses. The accurate constant volume device comprises a cylindrical body, a funnel part is arranged at the upper end of the cylindrical body, a narrow part and a valve core are arranged in the middle of the cylindrical body, and the valve core can realize the opening and closing of a liquid flow channel. Be equipped with first scale mark on the cylindricality body, the volumetric flask increases a scale mark on former scale mark's basis newly, and the volume that the scale difference instructed is the volume of predetermined volume promptly. The utility model relates to an exquisiteness for the experimenter provides can convenient and fast pour into the solvent, does not rely on with the drainage of glass stick, with the volumetric flask equipment sealed reliable, and the excessive misoperation of constant volume is retrieved to the unnecessary solvent of accessible suction.

Description

Accurate constant volume device and volumetric flask thereof

Technical Field

The utility model relates to an experimental apparatus field, specifically speaking relate to an accurate constant volume device and volumetric flask thereof.

Background

Constant volume is the routine experiment operation of chemical experiment, and when the solvent is added to be close to the constant volume scale mark during solution preparation, the solvent is dripped to the scale mark by using a rubber head dropper. When the configuration precision is not high, experimenters can also add solution and solvent to the scale mark respectively through the glass stick drainage, though improved operating efficiency, the solvent pours into excessive condition in the constant volume process easily, in case this kind of condition takes place, should add solution and solvent constant volume again, can not directly absorb unnecessary solution from the measuring flask, otherwise can cause the decline of preparing solution concentration.

On the other hand, because the volumetric flask is the narrow tube of upper end long and narrow, when utilizing beaker, glass stick drainage, the solution of pouring into can often spill over from glass stick and volumetric flask upper edge department, or directly leads to the solution to spill from the glass stick because of the drainage is too fast. These problems make the technician highly cautious in constant volume operations, the experiments time and labor consuming, and irreparable in the event of operator error.

Disclosure of Invention

The purpose of the invention is as follows: the utility model aims at providing an accurate constant volume device for improving the drainage efficiency and stability of a constant volume glass rod, when a solvent does not reach a constant volume scale, the misoperation of excessive constant volume can be rescued by performing 'predetermined volume' on the solvent outside a volumetric flask system; the utility model discloses still another purpose provides a volumetric flask with the supporting use of aforementioned accurate constant volume device, and it has compared in prior art and has had a constant volume scale mark more, and the reservation that corresponds accurate constant volume device holds the volume.

The technical scheme is as follows: in order to achieve the above purpose, the utility model discloses a precise constant volume device, which comprises a cylindrical body, wherein the body is vertically communicated to form a first cavity, the upper end of the body is provided with a funnel part which is wide at the upper part and narrow at the lower part, and the outer side of the lower end of the body is provided with a rubber sleeve; the body is provided with a second cavity along the radial direction, a horizontally movable valve core is arranged in the second cavity, and a third cavity is arranged on the valve core along the vertical direction; when the valve core is positioned at a first horizontal position, the valve core divides the first cavity into an upper cavity and a lower cavity which are independent from each other; when the valve core is located at the second horizontal position, the third cavity is communicated with the upper cavity and the lower cavity simultaneously.

The utility model is provided with the valve core, when the valve core is positioned at the first horizontal position, the channel of the precise constant volume device flowing to the volumetric flask is closed, so that the 'predetermined volume' is generated in the upper chamber at the upper part of the valve core; when the valve core is located at the second horizontal position, the channel is opened, and the solvent with the preset volume flows into the volumetric flask and just reaches the standard scale mark of the volumetric flask. The design of the device overcomes the irreparable problem caused by the over-capacity operation error in the prior art, and even if excessive solvent is poured in the process of 'reserving capacity', the excessive solvent can be sucked out by using the burette without influencing the concentration of the solution in the volumetric flask. The funnel part at the upper end of the body is designed, so that convenience is provided for constant volume glass rod drainage, and even the glass rod drainage can be omitted. Even if the experimenter pours the solvent into fast, the open design of funnel portion has guaranteed that the solvent can not spill over. The rubber buffer design of chemical reagent bottle has been used for reference in the design of rubber sleeve, and the rubber sleeve is to when turning up, exposes the junction of body lower extreme, and the butt joint volumetric flask goes up along the back, and the rubber sleeve that will turn up again recovers, can couple together both with accurate constant volume device and volumetric flask.

The utility model discloses can improve accurate constant volume device and volumetric flask junction under the cognition of technical staff to conventional technical means in this field, for example through the wedge design or the groove design of bottleneck, improve connection stability, prevent that liquid from exposing etc..

Further, the outer wall of the body is provided with first scale marks. The first tick mark is a tick mark that provides the experimenter with a "predetermined volume".

The inner cavity of the body is provided with a narrow part, and the second cavity is horizontally arranged on the narrow part, namely, the side wall of the body is thickened at the narrow part, and the design provides more reliable moving space for the horizontal movement of the valve core.

As the utility model discloses a further optimization, the maximum diameter of third cavity is no longer than the width of narrow portion to guarantee that the in-process of "predetermined volume" can not lead to the solvent to be stayed in the second cavity because of the third cavity diameter is too big.

Furthermore, in order to further optimize the preset precision and avoid the situation that the solvent is retained in the second cavity due to the design of the valve core, the edges of the upper opening and the lower opening of the third cavity of the valve core form a round angle, so that the solvent is converged and flows towards the center of the third cavity.

The utility model discloses a guarantee the moving state of case, still carried out spacing design. The diameters of the two ends of the valve core are smaller than the diameter of the middle of the valve core, and the diameter of the second cavity at the two ends is smaller than the diameter of the middle of the valve core. Therefore, no matter the valve core moves to the left end and the right end to the limit distance, the valve core is limited to further move by the openings which are reduced at the two ends of the second cavity. The utility model discloses do not do spacing design in case middle part, be the seal of considering the second cavity, should prevent as far as possible between solvent infiltration second cavity and the case, consequently the diameter at case middle part should with the internal diameter phase-match at second cavity middle part.

As the utility model discloses a further optimization, it is more convenient in order to let the experimenter operate, the both ends of case are equipped with the stalk portion of an enlarged form respectively, and when the case was located first horizontal position and second horizontal position respectively, one of them stalk portion leaned on in this body lateral wall.

The utility model also provides a volumetric flask that aforementioned accurate constant volume device is supporting to be used, this volumetric flask are equipped with the second scale mark of instructing the constant volume scale, the below of second scale mark still is equipped with the third scale mark, volume between second scale mark and the third scale mark is equal to the last cavity volume of accurate constant volume device first scale mark below.

Further, form thickening portion along outside week on the volumetric flask, will rubber sleeve cover of accurate constant volume device body lower extreme forms interference fit on the volumetric flask along forming, forms effectual sealed and fixed connection, and what kind of design is simple convenient, and the rubber sleeve can be changed after many times.

Accurate constant volume device make for transparent glass material, can adopt dark brown glass material to make to the reagent that the light is sensitive. The left end and the right end of the valve core are designed to be frosted glass surfaces, the valve core can be effectively fixed in the second cavity to prevent the valve core from sliding randomly, and meanwhile, the design is also beneficial to sealing.

The scale marks of the utility model include but are not limited to any one of pigment marks, groove lines or groove lines coated with pigment and colored rubberized fabric.

The operation method for carrying out constant volume by using the accurate constant volume device and the matched volumetric flask thereof is as follows:

1. the opening at the lower end of the accurate constant volume device body is aligned with the opening at the upper end of the volumetric flask, the rubber sleeve is turned downwards and sleeved on the thickening part at the upper edge of the volumetric flask, and the rubber sleeve and the volumetric flask are tightly connected.

2. And opening a valve of the accurate constant volume device, pushing the valve core to a second horizontal position, draining the solution by using a glass rod, or directly pouring the solution in the container into the funnel part, and pouring the solvent into the funnel part according to actual conditions. And liquid enters the inner cavity of the volumetric flask through the upper cavity, the third cavity and the lower cavity in sequence, and the liquid injection is stopped when the liquid level reaches the third scale mark.

3. And closing the valve of the precise constant volume device, pushing the valve core to a first horizontal position, sealing and accommodating a third cavity of the valve core in a second cavity at the moment, and dividing the first cavity into an upper cavity and a lower cavity which are independent and not communicated by the valve core.

4. Performing 'predetermined volume', draining with a glass rod, or directly pouring the solvent in the container into a funnel part, gradually raising the page to approach the first scale mark, carefully reducing the flow, and then-

(4a) Until the liquid level is flush with the first scale mark; or

(4b) If an excess is inadvertently poured, the excess solvent is pipetted until the level is flush with the first tick mark.

5. And opening the valve again, pushing the valve core to a second horizontal position, and enabling the solvent with the preset volume to flow into the volumetric flask and just reach a second scale mark, namely the standard scale of the volumetric flask.

6. And (5) uncovering the rubber sleeve, separating the precise constant volume device and the volumetric flask, and finishing constant volume.

The utility model provides an accurate constant volume device of separation can be applicable to any constant volume experiment operation, according to the not equidimension of capacity design of volumetric flask, the horizontal position of the device scale mark can carry out the adaptability adjustment according to technical staff's in the field needs. Generally, the volume of the predetermined volume is controlled to be within one tenth of the volume of the volumetric flask. The product body is made of glass, has stable chemical property, is beneficial to cleaning, and is sleeved with a rubber sleeve for fixing the volumetric flask when in use. Utilize the device to assist the constant volume, can effectively improve constant volume efficiency, even "predetermined volume" pours into the excess, also can directly absorb unnecessary liquid with the pipette and remedy. The product has an exquisite structure, can help technicians to fix the volume efficiently in a laboratory, and reduces errors.

Drawings

FIG. 1 is a schematic structural view of the assembled precise separation constant volume device and volumetric flask of the present invention;

FIG. 2 is a schematic longitudinal sectional view of the precise volume separation and metering device in accordance with example 1, wherein the valve core is at a first horizontal position;

FIG. 3 is a schematic longitudinal sectional view of the precise volume separation and metering device in accordance with embodiment 1, wherein the valve core is at a second horizontal position;

FIG. 4 is a partial structural view of a longitudinal section of a body according to example 1.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1

Referring to fig. 1 to 4, an accurate constant volume device of the present embodiment includes a cylindrical glass body 1, a first cavity 2 is formed inside the body 1 and penetrates up and down, a glass funnel portion 3 is disposed at an upper end of the body 1, the upper portion is wide and the lower portion is narrow, a rubber sleeve 4 is sleeved outside a lower end of the body 1, and a portion of the rubber sleeve 4, which exceeds the body, can be folded outwards. The outer wall of the body 1 is provided with a first scale mark 5. The first scale markings 5 are the scale lines of a "predetermined volume".

A narrow part 6 is arranged near the middle part of the inner cavity of the body 1, and the inner diameter of the narrow part 6 is smaller than that of other parts of the first cavity 2. The narrow part 6 extends further to the two outer sides of the body 1 to form a valve sleeve extending in the horizontal direction, the inner cavity of the valve sleeve is a second cavity 7, and the second cavity 7 is vertical to and communicated with the first cavity.

A valve core 8 is arranged in the second cavity 7, the valve core 8 of the embodiment is in a spindle-like shape, and the diameters of two ends of the valve core 8 are smaller than that of the middle part. Both ends are equipped with a stalk portion 9 that enlarges respectively about case 8, play limiting displacement, and when case 8 was located first horizontal position and second horizontal position respectively, one of them stalk portion 9 leaned on and connects in body 1 lateral wall. In addition, referring to fig. 4, the diameter of the second cavity 7 at the two ends is smaller than the diameter of the middle, and the second cavity also has a certain limiting function corresponding to the shape of the valve core 8. And frosted glass surfaces are arranged at two ends of the valve core 8 to increase the friction force. The valve core 8 is provided with a third cavity 10 in the vertical direction. The maximum diameter of the third cavity 10 does not exceed the width of the narrow part 6, and the edges of the upper opening and the lower opening of the third cavity 10 of the valve core 8 form a round angle, so that the solvent is converged and flows towards the center of the third cavity 10.

The valve core 8 is longer than the second cavity and can move back and forth in the second cavity 7 along the horizontal direction. When the spool 8 is in the first horizontal position, as shown in fig. 2, the spool 8 divides the first cavity into two independent upper and

lower chambers

11 and 12; as shown in fig. 3, when the spool 8 is in the second horizontal position, the third cavity 10 communicates with both the upper chamber 11 and the lower chamber 12.

Example 2

Referring to fig. 1, based on embodiment 1, this embodiment provides a volumetric flask 13 used with the above-mentioned precise volumetric apparatus, the volumetric flask 13 is not different from the prior art, and has a second scale mark 14 indicating a volumetric scale, a third scale mark 15 is further provided below the second scale mark 14, and a volume between the second scale mark 14 and the third scale mark 15 is equal to a volume of the upper chamber 11 below the first scale mark 5 of the precise volumetric apparatus.

The volumetric flask 13 may be designed with reference to other types of volumetric flasks 13 known in the art.

In addition, can carry out optimal design along the opening on volumetric flask 13, when making it dock with accurate constant volume device lower extreme opening, prevent that liquid from overflowing, for example design two opening butt joint faces into the recess cooperation, combine rubber sleeve 4 to wrap up opening butt joint department tightly again, guarantee that both are difficult to drop after connecting, it is sealed good.

Example 3

The precise constant volume device provided in embodiment 1 and the operation method for constant volume of the matching volumetric flask provided in embodiment 2 are as follows:

(4a) Until the liquid level is flush with the first scale mark; or

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides an accurate constant volume device which characterized in that: the device comprises a cylindrical body, wherein the body is vertically communicated to form a first cavity, a funnel part with a wide upper part and a narrow lower part is arranged at the upper end of the body, and a rubber sleeve is arranged on the outer side of the lower end of the body; the body is provided with a second cavity along the radial direction, a horizontally movable valve core is arranged in the second cavity, and a third cavity is arranged on the valve core along the vertical direction;

when the valve core is positioned at a first horizontal position, the valve core divides the first cavity into an upper cavity and a lower cavity which are independent from each other;

when the valve core is located at the second horizontal position, the third cavity is communicated with the upper cavity and the lower cavity simultaneously.

2. A precision volumetric apparatus according to claim 1, characterized in that: the outer wall of the body is provided with first scale marks.

3. A precision volumetric apparatus according to claim 2, characterized in that: the inner cavity of the body is provided with a narrow part, and the second cavity is horizontally arranged on the narrow part.

4. A precision volumetric apparatus according to claim 3, characterized in that: the maximum diameter of the third cavity does not exceed the width of the throat.

5. A precision volumetric device according to any of claims 1-4, characterized in that: and the edges of the upper opening and the lower opening of the third cavity of the valve core form a fillet.

6. An accurate volumetric apparatus according to claim 5, characterized in that: the diameters of the two ends of the valve core are smaller than the diameter of the middle of the valve core, and the diameter of the second cavity at the two ends is smaller than the diameter of the middle of the valve core.

7. An accurate volumetric apparatus according to claim 6, characterized in that: and when the valve core is respectively positioned at the first horizontal position and the second horizontal position, one of the handle parts is abutted against the side wall of the body.

8. A volumetric flask used with the accurate constant volume device of claim 2, which is provided with a second scale mark indicating a constant volume scale, characterized in that: and a third scale mark is also arranged below the second scale mark, and the volume between the second scale mark and the third scale mark is equal to the volume of the upper chamber below the first scale mark of the precise constant volume device.

9. Volumetric flask according to claim 8, characterized in that: the upper edge of the volumetric flask forms a thickened part towards the periphery, and the thickened part and the rubber sleeve at the lower end of the accurate constant volume device body form interference fit.