Sample adding device for removing bubbles in liquid path

Abstract

The utility model belongs to the technical field of chemical analysis equipment, and particularly relates to a liquid path bubble-removing sample adding device which comprises a sampling needle, a cleaning pool, an outer wall cleaning needle, a waste liquid barrel, an outer wall cleaning pump, an outer wall switching valve, a buffer tank, a cleaning liquid barrel, an inner wall switching valve, an inner wall cleaning pump and a metering pump, wherein an upper end outlet of the cleaning liquid barrel is communicated with an upper side connector of the buffer tank, an upper portion connector of the buffer tank is communicated with the normally-open end of the outer wall switching valve, the normally-closed end of the outer wall switching valve is communicated with a lower portion connector of the buffer tank, and the common end of the outer wall switching valve is connected with the outer wall cleaning needle through the outer wall cleaning pump; a normally closed end of the inner wall switching valve is communicated with a lower interface of the buffer tank, a common end of the inner wall switching valve is communicated with an inlet of the inner wall cleaning pump, an outlet of the inner wall cleaning pump is communicated with an inlet of the metering pump, and an outlet of the metering pump is communicated with the sampling needle; the cleaning pool is located below the outer wall cleaning needle, and the waste liquid barrel communicates with the cleaning pool. The device integrates the three functions of bubble removal, sampling needle cleaning and sample adding, the bubble removal effect is remarkable, the structural design is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chemical analysis equipment technical field, and specifically is a kind of liquid path bubble-removing sampling device. BACKGROUND

[0002] In full-automatic chemical analysis, sampling is an important stage, and accurate sampling quantity is one of the necessary conditions for obtaining accurate test results.If air bubbles or air are mixed in the sampling pipeline, the volume of gas will expand during the sampling process, resulting in insufficient and inaccurate sampling quantity. Since the volume of liquid does not easily expand and compress, the sampling accuracy is higher when the sampling pipeline is completely filled with liquid. Therefore, removing air bubbles in the sampling pipeline is an important means to ensure sampling accuracy.

[0003] In the prior art, most of the degassing membrane devices use the principle that water molecules cannot pass through the degassing membrane, while gas molecules can pass through the degassing membrane, to precipitate air bubbles in the pipeline. Although it has better degassing effect, the design is relatively complex and the cost is high. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a liquid path bubble-removing sampling device.

[0005] The utility model solves the technical problem by adopting the following technical scheme:

[0006] A liquid path bubble-removing sampling device, characterized in that the device comprises a sampling needle, a cleaning pool, an outer wall cleaning needle, a waste liquid barrel, an outer wall cleaning pump, an outer wall switching valve, a buffer tank, a cleaning liquid barrel, an inner wall switching valve, an inner wall cleaning pump and a quantitative pump. The upper end outlet of the cleaning liquid barrel is in communication with the upper side interface of the buffer tank. The upper interface of the buffer tank is in communication with the normally open end of the outer wall switching valve. The normally closed end of the outer wall switching valve is in communication with the lower interface of the buffer tank. The common end of the outer wall switching valve is connected with the outer wall cleaning needle through the outer wall cleaning pump. The normally closed end of the inner wall switching valve is in communication with the lower interface of the buffer tank. The common end of the inner wall switching valve is in communication with the inlet of the inner wall cleaning pump. The outlet of the inner wall cleaning pump is in communication with the inlet of the quantitative pump. The outlet of the quantitative pump is in communication with the sampling needle. The cleaning pool is located below the outer wall cleaning needle. The waste liquid barrel is in communication with the cleaning pool.

[0007] Further, the buffer tank is provided with a buffer tank float.

[0008] Further, the outer wall cleaning pump and the inner wall cleaning pump are both diaphragm pumps.

[0009] Further, the upper part of the cleaning liquid barrel is provided with a vent hole.

[0010] Compared with the prior art, the utility model has the advantages and positive effects that:

[0011] The upper interface of the buffer tank is communicated with the outer wall cleaning pump through the outer wall switching valve, the outer wall cleaning pump is used to make the cleaning liquid in the cleaning liquid barrel fill the buffer tank, and air in the outer wall cleaning pipeline (the pipeline formed by the buffer tank, the outer wall switching valve, the outer wall cleaning pump and the outer wall cleaning needle) is discharged; the lower interface of the buffer tank is communicated with the outer wall cleaning pump through the outer wall switching valve, the cleaning liquid in the buffer tank which has been separated into bubbles is discharged from the outer wall cleaning needle, and the purpose of cleaning the outer wall of the sampling needle is achieved. The inner wall cleaning pump is communicated with the lower interface of the buffer tank through the inner wall switching valve, the cleaning liquid in the buffer tank which has been separated into bubbles is discharged from the sampling needle, no bubble is ensured in the sampling needle pipeline, and the purpose of cleaning the inner wall of the sampling needle is achieved. The quantitative pump is communicated with the lower interface of the buffer tank through the inner wall switching valve, and the pipeline between the quantitative pump and the sampling needle is filled with the cleaning liquid without bubbles at the moment, the volume of the liquid is not easy to change relative to air, and the accuracy of the sample amount is ensured in the process that the quantitative pump absorbs and discharges the sample and the reagent. The device integrates the three functions of removing bubbles, cleaning the sampling needle and adding samples, has simple structure and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the whole structure schematic diagram of the utility model;

[0013] Figure 2 It is the work flow chart of the utility model;

[0014] The following is the explanation of the reference signs:

[0015] 1-sampling needle;2-cleaning pool;3-outer wall cleaning needle;4-waste liquid barrel;5-outer wall cleaning pump;6-outer wall switching valve;7-buffer tank;8-buffer tank float;9-cleaning liquid barrel;10-inner wall switching valve;11-inner wall cleaning pump;12-quantitative pump. DETAILED DESCRIPTION

[0016] The following specific embodiments are given in combination with the drawings, and the specific embodiments are only used to specifically introduce the technical scheme of the utility model, but do not limit the protection scope of the application.

[0017] As Figure 1As shown, the utility model provides a kind of bubble of liquid path's sampling device (abbreviation device), including sampling needle 1, cleaning pool 2, outer wall cleaning needle 3, waste liquid barrel 4, outer wall cleaning pump 5, outer wall switch valve 6, buffer tank 7, cleaning liquid barrel 9, inner wall switch valve 10, inner wall cleaning pump 11 and quantitative pump 12;Wherein, the upper end outlet of cleaning liquid barrel 9 is communicated with the upper side interface of buffer tank 7 by pumping tube, the upper interface of buffer tank 7 is communicated with the normally open end of outer wall switch valve 6, the normally closed end of outer wall switch valve 6 is communicated with the lower interface of buffer tank 7, the common end of outer wall switch valve 6 is connected with outer wall cleaning needle 3 by outer wall cleaning pump 5, and outer wall cleaning needle 3 is used to clean the outer wall of sampling needle 1;The normally closed end of inner wall switch valve 10 is communicated with the lower interface of buffer tank 7, the common end of inner wall switch valve 10 is communicated with the inlet of inner wall cleaning pump 11, the outlet of inner wall cleaning pump 11 is communicated with the inlet of quantitative pump 12, and the outlet of quantitative pump 12 is communicated with sampling needle 1;Cleaning pool 2 is located below outer wall cleaning needle 3, waste liquid barrel 4 is communicated with cleaning pool 2, and is used to collect the cleaning liquid sprayed by outer wall cleaning needle 3 and sampling needle 1.

[0018] The cleaning liquid barrel 9 is used for storing cleaning liquid and providing cleaning liquid for the whole liquid path.

[0019] The buffer tank 7 is a closed tank, and the buffer tank 7 is provided with a buffer tank float 8 for detecting whether the cleaning liquid in the buffer tank 7 is full.

[0020] The outer wall switch valve 6 and the inner wall switch valve 10 are two-position three-way valves, and each has three interfaces, namely a common end, a normally closed end and a normally open end. The normally open end of the outer wall switch valve 6 is communicated with the upper interface of the buffer bottle 7, and is used for discharging air in the pipeline and air separated out by the cleaning liquid through the outer wall cleaning needle 3. The normally closed end of the outer wall switch valve 6 is communicated with the lower interface of the buffer bottle 7, and is used for cleaning the outer wall of the sampling needle 1. The normally closed end of the inner wall switch valve 10 is communicated with the lower interface of the buffer bottle 7, and is used for cleaning the inner wall of the sampling needle 1.

[0021] The outer wall cleaning pump 5 and the inner wall cleaning pump 11 are diaphragm pumps, and the outer wall cleaning pump 5 is used to provide power for the cleaning liquid flowing out of the outer wall cleaning needle 3, and the inner wall cleaning pump 11 is used to provide power for the cleaning liquid pumping out of the sampling needle 1.

[0022] The quantitative pump 12 is used for inhaling and discharging samples and reagents, and has high precision.

[0023] The working principle and working process of the utility model are as follows:

[0024] AsFigure 2 As shown, the cleaning liquid tank 9 is filled with cleaning liquid, and the outer wall switching valve 6 is switched to the state that the outer wall cleaning pump 5 is in communication with the upper interface of the buffer tank 7; the outer wall cleaning pump 5 works to fill the buffer tank 7 with cleaning liquid until the cleaning liquid is discharged from the outer wall cleaning needle 3, and the bubbles in the buffer tank 7 are discharged through the outer wall cleaning needle 3, so as to achieve the purpose of removing the bubbles in the outer wall cleaning pipeline; at this time, the buffer tank 7 is basically free of bubbles, and the buffer tank float 8 detects that the buffer tank 7 is filled with cleaning liquid, and the outer wall cleaning pump is closed.

[0025] The outer wall switching valve 6 is switched to the state that the outer wall cleaning pump 5 is in communication with the lower interface of the buffer tank 7; the outer wall cleaning pump 5 works to pump the cleaning liquid in the buffer tank 7 to the outer wall cleaning needle 3, and the outer wall cleaning needle 3 sprays the cleaning liquid to clean the outer wall of the sampling needle 1.

[0026] During the cleaning of the outer wall of the sampling needle 1, the inner wall switching valve 10 is switched to the state that the inner wall cleaning pump 11 is in communication with the lower interface of the buffer tank 7; the inner wall cleaning pump 11 works to make the cleaning liquid in the buffer tank 7 enter the internal pipeline of the sampling needle 1 until the cleaning liquid is discharged from the sampling needle 1, so as to achieve the purpose of discharging the bubbles in the sampling needle pipeline and cleaning the inner wall of the sampling needle 1.

[0027] After the cleaning of the inner wall of the sampling needle 1 is completed, the inner wall switching valve 10 is switched to the state that the inner wall cleaning pump 11 is closed with the lower interface of the buffer tank 7; the sampling needle 1 is inserted into the liquid reagent or sample, the quantitative pump 12 works to suck the reagent or sample, and then the quantitative pump 12 discharges the reagent or sample into the reaction cup. Since the volume of the liquid relative to the air is less likely to change, the fewer the bubbles in the pipeline, the higher the sampling accuracy, so as to ensure high sampling accuracy.

[0028] The unmentioned part of the utility model is applicable to the prior art.

Claims

1. A sample dispensing device for degassing liquid channels, characterized in that, The device includes a sampling needle, a cleaning tank, an outer wall cleaning needle, a waste liquid tank, an outer wall cleaning pump, an outer wall switching valve, a buffer tank, a cleaning liquid tank, an inner wall switching valve, an inner wall cleaning pump, and a metering pump. The upper outlet of the cleaning liquid tank is connected to the upper interface of the buffer tank; the upper interface of the buffer tank is connected to the normally open end of the outer wall switching valve; the normally closed end of the outer wall switching valve is connected to the lower interface of the buffer tank; the common end of the outer wall switching valve is connected to the outer wall cleaning needle via the outer wall cleaning pump. The normally closed end of the inner wall switching valve is connected to the lower interface of the buffer tank; the common end of the inner wall switching valve is connected to the inlet of the inner wall cleaning pump; the outlet of the inner wall cleaning pump is connected to the inlet of the metering pump; and the outlet of the metering pump is connected to the sampling needle. The cleaning tank is located below the outer wall cleaning needle, and the waste liquid tank is connected to the cleaning tank.

2. The sample dispensing device for degassing liquid flow according to claim 1, characterized in that, The buffer tank is equipped with a buffer tank float.

3. The sample dispensing device for degassing liquid flow according to claim 1 or 2, characterized in that, Both the outer wall cleaning pump and the inner wall cleaning pump are diaphragm pumps.

4. The sample dispensing device for degassing liquid channels according to claim 3, characterized in that, The cleaning fluid tank has a vent at the top.

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