A cleaning device for a sample needle

Abstract

The utility model discloses a kind of cleaning devices of sample adding needle, including cleaning liquid barrel, cleaning liquid pump, cleaning pool, switching valve and vacuum tank etc.;Cleaning liquid barrel is communicated with the import end of sample adding needle and the washing port of cleaning pool side by cleaning liquid pump respectively, the waste liquid outlet of cleaning pool lower end and the public end of No. 1 switching valve are communicated, the normally closed end of No. 1 switching valve and the upper port of No. 2 vacuum tank are communicated, the lower port of No. 2 vacuum tank is communicated with the import end of No. 2 vacuum tank pump.;The normally open end of No. 1 switching valve is connected with the normally closed end of No. 2 switching valve and the import end of No. 1 vacuum tank switch valve respectively, the outlet end of No. 1 vacuum tank switch valve is communicated with the upper port of No. 1 vacuum tank, the lower port of No. 1 vacuum tank is communicated with the normally open end of No. 2 switching valve, the public end of No. 2 switching valve is communicated with the import end of No. 1 vacuum tank pump. The device realizes the accurate and efficient cleaning of sample adding needle by three steps, significantly reduces the risk of cross contamination, improves the accuracy and reliability of detection.

Description

Technical Field

[0001] This invention belongs to the technical field of chemical analysis equipment, specifically a cleaning device for sample dispensing needles. Background Technology

[0002] In fully automated chemical analysis, cleaning the sampling needle is a crucial step. The needle needs to sample different samples during operation; if it is not thoroughly cleaned after each sampling, cross-contamination can easily occur, directly impacting the accuracy and reliability of the test results.

[0003] In existing technologies, one method uses pressure to drive the cleaning fluid to clean the sample needle, and the other uses vacuum negative pressure to draw the cleaning fluid to clean and rinse the sample needle. However, the sample needle still has problems such as incomplete cleaning or residue after cleaning, which affects the accuracy and reliability of the detection. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a cleaning device for a sample dispensing needle.

[0005] The present invention solves the aforementioned technical problem by adopting the following technical solution: A cleaning device for a sample dispensing needle, characterized in that it includes a cleaning solution tank, a cleaning solution pump, a cleaning pool, a first switching valve, a first vacuum tank switch valve, a first vacuum tank, a second switching valve, a first vacuum tank pump, a second vacuum tank pump, and a second vacuum tank. The upper port of the cleaning solution tank is connected to the inlet of the cleaning solution pump. The outlet of the cleaning solution pump is connected to the inlet of the sampling needle and the rinsing port on the side of the cleaning tank. The waste liquid outlet at the lower end of the cleaning tank is connected to the common end of the No. 1 switching valve. The normally closed end of the No. 1 switching valve is connected to the upper port of the No. 2 vacuum tank. The lower port of the No. 2 vacuum tank is connected to the inlet of the No. 2 vacuum tank pump. The outlet of the No. 2 vacuum tank pump is connected to the waste liquid outlet. The normally open end of the No. 1 switching valve is connected to the normally closed end of the No. 2 switching valve and the inlet of the No. 1 vacuum tank switching valve. The outlet of the No. 1 vacuum tank switching valve is connected to the upper port of the No. 1 vacuum tank. The lower port of the No. 1 vacuum tank is connected to the normally open end of the No. 2 switching valve. The common end of the No. 2 switching valve is connected to the inlet of the No. 1 vacuum tank pump. The outlet of the No. 1 vacuum tank pump is connected to the waste liquid outlet.

[0006] Furthermore, the cleaning fluid pump, the first vacuum tank pump, and the second vacuum tank pump are all diaphragm pumps.

[0007] Furthermore, the cleaning fluid tank is provided with a vent at the top and a liquid level sensor is provided inside the cleaning fluid tank.

[0008] Furthermore, the liquid path between the cleaning solution tank and the sample needle is equipped with an air bubble removal device.

[0009] Furthermore, a sample dispensing pump is provided in the liquid path between the cleaning fluid pump and the sample dispensing needle.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are: Unlike the single cleaning method in current technology, this utility model adopts a three-step cleaning process. The first step is to soak and clean the needle in a flowing cleaning solution in a cleaning tank. The second step is to use vacuum negative pressure to draw the high-speed flow of the cleaning solution to rinse and clean the needle. The third step is to use vacuum negative pressure to remove the needle and the remaining cleaning solution in the cleaning tank. This reduces residue and cross-contamination on the needle, solves the problem of incomplete cleaning or residue after cleaning, and ensures improved accuracy and reliability of the detection. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a flowchart of the process of this utility model; The annotations in the attached figures are explained as follows: 1-Cleaning solution tank; 2-Cleaning solution pump; 3-Sampling needle; 4-Cleaning pool; 5-Switching valve No. 1; 6-Vacuum tank No. 1 switch valve; 7-Vacuum tank No. 1; 8-Switching valve No. 2; 9-Vacuum tank No. 1 pump; 10-Vacuum tank No. 2 pump; 11-Vacuum tank No. 2. Detailed Implementation

[0012] Specific embodiments are given below with reference to the accompanying drawings. These specific embodiments are only used to describe the technical solution of this utility model in detail, but are not intended to limit the scope of protection of this application.

[0013] like Figure 1 As shown, this utility model provides a cleaning device for a sample dispensing needle (hereinafter referred to as the device), including a cleaning liquid tank 1, a cleaning liquid pump 2, a cleaning pool 4, a first switching valve 5, a first vacuum tank switch valve 6, a first vacuum tank 7, a second switching valve 8, a first vacuum tank pump 9, a second vacuum tank pump 10, and a second vacuum tank 11. The upper port of the cleaning solution tank 1 is connected to the inlet of the cleaning solution pump 2, and the outlet of the cleaning solution pump 2 is connected to the inlet of the sampling needle 3 and the rinsing port on the side of the cleaning tank 4. The waste liquid outlet at the lower end of the cleaning tank 4 is connected to the common end of the first switching valve 5. The normally closed end of the first switching valve 5 is connected to the upper port of the second vacuum tank 11. The lower port of the second vacuum tank 11 is connected to the inlet of the second vacuum tank pump 10. The outlet of the second vacuum tank pump 10 is connected to the waste liquid port. The normally open end of the first switching valve 5 is connected to the normally closed end of the second switching valve 8 and the inlet of the first vacuum tank switch valve 6. The outlet of the first vacuum tank switch valve 6 is connected to the upper port of the first vacuum tank 7. The lower port of the first vacuum tank 7 is connected to the normally open end of the second switching valve 8. The common end of the second switching valve 8 is connected to the inlet of the first vacuum tank pump 9. The outlet of the first vacuum tank pump 9 is connected to the waste liquid port.

[0014] The cleaning fluid tank 1 is used to store cleaning fluid and provide cleaning fluid for the entire liquid circuit; the upper part of the cleaning fluid tank 1 is provided with a vent hole to allow the interior of the cleaning fluid tank 1 to communicate with the atmosphere, making it easier to pump the fluid; the cleaning fluid tank 1 is provided with a liquid level sensor to detect the cleaning fluid.

[0015] Both vacuum tank 7 and vacuum tank 11 are airtight sealed tanks. The waste liquid in the cleaning tank 4 is drawn into the vacuum tank by negative pressure. At the same time, the negative pressure inside the vacuum tank and the external atmospheric pressure will form a pressure difference. The pressure difference will promote the high-speed airflow outside the tank to enter the tank. The high-speed airflow mixes with the low-flow cleaning liquid sprayed from the sampling needle 3 and the cleaning tank 4, thereby forming a high-flow-rate gas-liquid mixture to rinse the sampling needle 3.

[0016] Switching valve 5 (No. 1) and switching valve 8 (No. 2) are two-position three-way valves with three ports: a common port, a normally closed port, and a normally open port. In the de-energized (closed) state, the common port and the normally open port are connected; in the energized (open) state, the common port and the normally closed port are connected. Vacuum tank switching valve 6 (No. 1) is a two-position two-way valve with two ports: an inlet port and an outlet port. In the de-energized (closed) state, the inlet port and the outlet port are not connected; in the energized (open) state, the inlet port and the outlet port are connected.

[0017] The cleaning fluid pump 2, vacuum tank pump 9, and vacuum tank pump 10 are all diaphragm pumps. The cleaning fluid pump 2 is used to provide power for cleaning the inner and outer walls of the sample needle 3. The vacuum tank pump 9 and vacuum tank pump 10 provide power for the negative pressure and waste liquid discharge of the corresponding vacuum tanks.

[0018] An air-removing device is installed in the liquid path between the cleaning solution tank 1 and the sampling needle 3. A precision sampling pump for liquid aspiration and dispensing is installed in the liquid path between the cleaning solution pump 2 and the sampling needle 3.

[0019] The working principle and workflow of this utility model are as follows: like Figure 2 As shown, the cleaning of the sampling needle consists of three steps: soaking, rinsing, and draining residual liquid. After these three steps, the cleaning of the sampling needle 3 is more thorough, and the residual cleaning solution on the sampling needle 3 will be reduced to the greatest extent, thereby reducing cross-contamination and improving the accuracy and reliability of the detection.

[0020] First, the cleaning fluid tank 1 is filled with cleaning fluid, and the No. 1 vacuum tank pump 9 and the No. 2 vacuum tank pump 10 are put into operation, so that the No. 1 vacuum tank 7 and the No. 2 vacuum tank 11 are in a negative pressure state.

[0021] Then, the cleaning solution pump 2 operates, pumping the cleaning solution into the sampling needle 3 and the cleaning tank 4 to clean the inner and outer walls of the sampling needle 3. Simultaneously, the first vacuum tank switch valve 6 and the second vacuum tank pump 10 are closed, and the first switching valve 5 and the second switching valve 8 are switched to connect them. The first vacuum tank pump 9 is then opened, and the waste liquid in the cleaning tank 4 is discharged sequentially through the first switching valve 5, the second switching valve 8, and the first vacuum tank pump 9 to the waste liquid outlet. During this process, the amount of waste liquid discharged is almost the same as the amount of cleaning solution introduced into the cleaning tank 4. The cleaning tank 4 is filled with cleaning solution, and the outer wall of the sampling needle 3 is immersed in the flowing cleaning solution, thus immersing and cleaning the outer wall of the sampling needle 3.

[0022] Next, switch valve 8 (number 2) is switched to connect with vacuum tank 7 (number 1), and vacuum tank 7 (number 1) switch valve 6 is opened. The waste liquid in cleaning tank 4 is discharged to the waste liquid outlet through switching valve 5 (number 1), vacuum tank 7 (number 1), switching valve 8 (number 2), and vacuum tank pump 9 (number 1). During this process, vacuum tank 7 is under negative pressure, which draws the cleaning liquid in cleaning tank 4 to accelerate its flow and flush the outer wall of the sampling needle 3.

[0023] Furthermore, the first vacuum tank switch valve 6 and cleaning fluid pump 2 are closed, the second vacuum tank pump 10 is turned on, and the first switching valve 5 is switched to connect with the second vacuum tank 11. The waste liquid in the cleaning tank 4 is discharged to the waste liquid outlet through the first switching valve 5, the second vacuum tank 11, and the second vacuum tank pump 10 in sequence. During this process, the cleaning fluid pump 2 is turned off, the cleaning fluid supply stops, and after rinsing and cleaning, there is basically no cleaning fluid in the cleaning tank 4. At this time, the second vacuum tank 11 is under negative pressure. The negative pressure will promote the airflow from the outside into the cleaning tank 4, which will draw away the residual cleaning fluid on the cleaning tank 4 and the sampling needle 3, completing the discharge of residual liquid.

[0024] Finally, all pump valves were closed, and the cleaning process of the sample needle 3 was completed.

[0025] Any aspects not covered in this utility model are applicable to the prior art.

Claims

1. A cleaning device for a sample dispensing needle, characterized in that, Includes cleaning fluid tank, cleaning fluid pump, cleaning pool, No. 1 switching valve, No. 1 vacuum tank switch valve, No. 1 vacuum tank, No. 2 switching valve, No. 1 vacuum tank pump, No. 2 vacuum tank pump and No. 2 vacuum tank; The upper port of the cleaning solution tank is connected to the inlet of the cleaning solution pump. The outlet of the cleaning solution pump is connected to the inlet of the sampling needle and the rinsing port on the side of the cleaning tank. The waste liquid outlet at the lower end of the cleaning tank is connected to the common end of the No. 1 switching valve. The normally closed end of the No. 1 switching valve is connected to the upper port of the No. 2 vacuum tank. The lower port of the No. 2 vacuum tank is connected to the inlet of the No. 2 vacuum tank pump. The outlet of the No. 2 vacuum tank pump is connected to the waste liquid port. The normally open end of the No. 1 switching valve is connected to the normally closed end of the No. 2 switching valve and the inlet of the No. 1 vacuum tank switching valve. The outlet of the No. 1 vacuum tank switching valve is connected to the upper port of the No. 1 vacuum tank. The lower port of the No. 1 vacuum tank is connected to the normally open end of the No. 2 switching valve. The common end of the No. 2 switching valve is connected to the inlet of the No. 1 vacuum tank pump. The outlet of the No. 1 vacuum tank pump is connected to the waste liquid port.

2. The cleaning device for the sampling needle according to claim 1, characterized in that, The cleaning fluid pump, vacuum tank pump No. 1, and vacuum tank pump No. 2 are all diaphragm pumps.

3. The cleaning device for the sampling needle according to claim 1, characterized in that, The cleaning fluid tank is equipped with a vent at the top and a liquid level sensor inside.

4. The cleaning device for the sampling needle according to claim 1, characterized in that, The liquid path between the cleaning solution tank and the sample needle is equipped with an air bubble removal device.

5. The cleaning device for the sampling needle according to any one of claims 1 to 4, characterized in that, A sample dispensing pump is provided in the liquid path between the cleaning fluid pump and the sample dispensing needle.

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