CN205683981U - A kind of quantitative liquid feeding system - Google Patents

Abstract

The utility model provides a quantitative liquid addition system, which comprises a liquid storage device, a filter, a sealing cover, a gas delivery pipe, a liquid delivery pipe, a pressure reducing valve, a stop valve, a bubble valve, a photoelectric sensor and a control device. The utility model combines the compressed gas to provide the power for adding liquid, and the speed of adding liquid can be realized according to the output pressure of the pressure reducing valve, and the adjustable range is large; the design system of the utility model is a closed system, and various toxic and harmful reagents cannot volatilize. There are no special requirements for the surrounding environment, and there is no harm to the health of the experimenters; since the utility model does not use elastic elements similar to peristaltic pump tubes, the system accuracy is stable and reliable, and does not require frequent calibration and replacement of consumables.

Description

A quantitative dosing system

technical field

The utility model belongs to the field of experimental instruments, in particular to a quantitative liquid addition system.

Background technique

The laboratory often needs to use quantitative dosing, which is mainly used to add liquid to various chemical reactions. For example, a large amount of acid needs to be added when the sample is digested, and it needs to be replenished during the digestion process, and the volume is constant after the digestion is completed.

Most of the existing liquid addition in the laboratory is manually operated, or a peristaltic pump or a syringe pump is used. Manual operation is not efficient, requires a high level of experience and proficiency for the experimenter, and is prone to errors; many organic solvents and various acids used in the experiment are toxic, and it is inevitable to inhale various toxic and harmful substances during the liquid addition process. gas, which has serious health effects. Some reagents are also very dangerous, such as perchloric acid, hydrofluoric acid, etc., which are prone to personal injury accidents.

The automatic dosing system using a peristaltic pump or a syringe pump can reduce some manual operations and risks, but there are also many disadvantages:

1. The precision of the peristaltic pump is not high. With the aging of the peristaltic pump tube, it gradually loses its elasticity, and the accuracy cannot be guaranteed after a long time.

2. Limited by the material, the corrosion resistance of the peristaltic pump tube is not strong and needs to be replaced regularly.

3. Because the friction force on the piston is relatively large, crawling cannot be avoided, resulting in worse accuracy of the syringe pump than the peristaltic pump.

4. The volume of the syringe pump is too small to achieve continuous liquid supply. If the amount of liquid added at one time is large, it is very cumbersome to frequently add liquid to the syringe pump, and the efficiency is low.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a liquid adding system which utilizes compressed gas as the driving force and uses a bubble generator and a photoelectric sensor as the quantitative mechanism.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A quantitative liquid addition system, characterized in that it includes a liquid storage container (1), a sealing cover (3) matched with the liquid storage container (1), an infusion tube (4), an air delivery tube (10), a control device (9 ); the liquid inlet end of the infusion tube (4) passes through the sealing cover (3) and is located at the inner bottom of the storage container (1), and a filter (2) is arranged at the port; the air outlet of the air delivery tube (10) The end passes through the sealing cover (3) and its port is higher than the height of the liquid in the liquid storage container (1), and the air inlet end of the air delivery pipe (10) is connected to the air source; the infusion pipe (4) and the air delivery pipe (10 ) through the branch pipe (11); the air pipe (10) between the connection of the air pipe (10) and the branch pipe (11) and the outlet end of the air pipe (10) is provided with a pressure reducing valve (5) ; The branch pipe (11) is provided with a decompression valve (5) and a bubble valve (6) in order from near to far from the air pipe (10); the connection between the infusion pipe (4) and the branch pipe (11) The infusion tube (4) between the infusion tube (4) and the infusion tube (4) is provided with a shut-off valve (7), and the connection between the infusion tube (4) and the branch tube (11) and the liquid outlet end of the infusion tube (4) The infusion tube (4) between them is provided with a photoelectric sensor (8); the bubble valve (6), the shut-off valve (7), and the photoelectric sensor (8) are connected with the control device (9).

The sealing cover (3) is screw connected with the liquid storage container (1).

The utility model comprises a liquid storage device, a sealing cover, a filter, a compressed air source, a pressure reducing valve, an air delivery pipe, a liquid infusion pipe, a stop valve, a bubble valve, a photoelectric sensor and a control device.

The sealing cover is placed on the top of the liquid reservoir, and it is tightly sealed with the liquid reservoir. The air delivery tube and the infusion tube pass through the sealing cover. The gas outlet is located above the liquid surface, and the gas inlet is connected to the gas source.

The compressed gas from the air source is adjusted by the pressure reducing valve and sent to the liquid reservoir and the bubble valve; the bubble valve on the branch pipe is connected in parallel with the stop valve on the infusion tube, and the gas and liquid merge into the infusion tube at the junction of the branch pipe and the infusion tube After passing through the photoelectric sensor, it is output to the liquid filling port;

The control system is connected with the shut-off valve, the bubble valve and the photoelectric sensor.

When the bubble valve is working, it is always intermittently turned on, generating small bubbles for detection by the photoelectric detector, providing a signal to the control system to judge the actual flow through; when the required capacity is reached, the shut-off valve is closed, the bubble valve is turned on, and the infusion tube The liquid is delivered to the liquid outlet, and this part of the inherent volume needs to be calculated in the required liquid addition.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. The utility model provides liquid feeding power through compressed gas, and the liquid feeding speed can be realized according to the pressure reducing valve output air pressure, and the adjustable range is large;

2. The design system of this utility model is a closed system, and various toxic and harmful reagents cannot volatilize, there is no special requirement for the surrounding environment, and there is no damage to the health of the experimenters;

3. Since the utility model does not use elastic elements similar to peristaltic pump tubes, the system accuracy is stable and reliable, and frequent calibration and replacement of consumables are not required.

Description of drawings

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

Among them, 1—reservoir, 2—filter, 3—sealing cover, 4—infusion tube, 5—pressure reducing valve, 6—bubble valve, 7—stop valve, 8—photoelectric sensor, 9—control device, Air pipe—10, branch pipe—11.

detailed description

Below in conjunction with embodiment and accompanying drawing, the utility model is further described.

A quantitative liquid addition system, characterized in that it includes a liquid storage container (1), a sealing cover (3) matched with the liquid storage container (1), an infusion tube (4), an air delivery tube (10), a control device (9 ); the liquid inlet end of the infusion tube (4) passes through the sealing cover (3) and is located at the inner bottom of the storage container (1), and a filter (2) is arranged at the port; the air outlet of the air delivery tube (10) The end passes through the sealing cover (3) and its port is higher than the height of the liquid in the liquid storage container (1), and the air inlet end of the air delivery pipe (10) is connected to the air source; the infusion pipe (4) and the air delivery pipe (10 ) through the branch pipe (11); the air pipe (10) between the connection of the air pipe (10) and the branch pipe (11) and the outlet end of the air pipe (10) is provided with a pressure reducing valve (5) ; The branch pipe (11) is provided with a decompression valve (5) and a bubble valve (6) in order from near to far from the air pipe (10); the connection between the infusion pipe (4) and the branch pipe (11) The infusion tube (4) between the infusion tube (4) and the infusion tube (4) is provided with a shut-off valve (7), and the connection between the infusion tube (4) and the branch tube (11) and the liquid outlet end of the infusion tube (4) The infusion tube (4) between them is provided with a photoelectric sensor (8); the bubble valve (6), the shut-off valve (7), and the photoelectric sensor (8) are connected with the control device (9).

The sealing cover (3) is screw connected with the liquid storage container (1).

When the bubble valve is filled with liquid, it is always conducting intermittently, and small bubbles are generated for detection by the photoelectric detector.

The power of system filling comes from compressed gas.

As shown in Figure 1, the utility model includes a liquid storage container, a filter, a sealing cover, an air delivery pipe, an infusion pipe, a pressure reducing valve, a stop valve, a bubble valve, a photoelectric sensor and a control device; the filter is located in the liquid storage solution. The bottom of the device to avoid blockage of pipelines and valves; the compressed gas from the gas source is decompressed to a certain stable pressure after passing through the pressure reducing valve, and then leads to the gas delivery pipe of the liquid receiver. Because of the sealing effect of the sealing cover, the pressure is transmitted to the top of the liquid surface, When the shut-off valve (electromagnetic type) is opened, the reagent will be pressed out through the filter, infusion tube, and shut-off valve; while the reagent is flowing out, the bubble valve will be quickly turned on and off, and the compressed gas will generate small bubbles in the infusion tube ; By adjusting the pressure of the pressure reducing valve and the conduction time of the bubble valve, the size of the generated bubbles can be adjusted.

When the setting conditions remain unchanged, liquid segments and air bubbles of uniform length will be generated in the infusion tube; when the liquid segments and air bubbles flow through the photoelectric sensor, the sensor will receive a series of intermittent signals; the controller can Calculate the number of liquid segments passing through the sensor. Since the length of the air bubbles and liquid segments after the condition is determined is determined, it can be quantified according to the number of liquid segments. When the shut-off valve is closed, the bubble valve continues to conduct for a period of time, and the section of liquid behind the shut-off valve is directly blown out of the filling liquid outlet. The inherent volume of this section can also be determined, so the total volume of reagent added can be accurately calculated. This can realize completely no waste liquid, saving and environmental protection.

The quantitative basis of the liquid adding device is to detect the number of passing liquid sections, which is obtained by calculating with the volume of a single liquid section and the intrinsic volume of the pipeline.

The calculation formula is as follows: V = V ₀ × n + V ₁ ;

V: total volume of liquid added;

V _0: the volume of a single liquid segment;

n: number of liquid segments;

V _1: A section of inherent volume after the shut-off valve.

Claims (2)

1. a quantitative liquid feeding system, it is characterised in that: include the sealing lid that liquid storage container (1) coordinates with liquid storage container (1) (3), tube for transfusion (4), appendix (10), control device (9)；The liquid feeding end of described tube for transfusion (4) is through sealing lid (3) and being positioned at Store container (1) inner bottom part, and port is provided with filter (1)；The outlet side of described appendix (10) is through sealing lid (3) And its port is higher than the height of liquid in liquid storage container (1), the inlet end of appendix (10) is connected with source of the gas；Described tube for transfusion (4) connected by branched pipe (11) with appendix (10)；Described appendix (10) and branched pipe (11) junction and appendix (10) it is provided with air relief valve (5) on the appendix (10) between outlet side；The upper distance appendix (10) of described branched pipe (11) By near to being far disposed with air relief valve (5) and bubble valve (6)；Described tube for transfusion (4) and branched pipe (11) junction and transfusion Being provided with stop valve (7) on tube for transfusion (4) between the liquid feeding end of pipe (4), tube for transfusion (4) and branched pipe (11) junction are with defeated It is provided with photoelectric sensor (8) on tube for transfusion (4) between the liquid outlet of liquid pipe (4)；Described bubble valve (6), stop valve (7), Photoelectric sensor (8) is connected with controlling device (9).

2. quantitative liquid feeding system as claimed in claim 1, it is characterised in that: described sealing covers (3) and liquid storage container (1) spiral Connect.