Automatic sample retention device and control method thereof

Abstract

The present invention provides an automatic sample retention device, comprising: a box body, comprising a first liquid inlet connected to an external ammonia water pipe, a second liquid inlet connected to an external cleaning water pipe, and a liquid outlet arranged at the bottom thereof; a sample retention bottle, fixed on the bottom of the box body, the bottom of the sample retention bottle is connected to the liquid outlet, and the top of the sample retention bottle is connected to the second liquid inlet; an injection pump, fixed on the bottom of the box body; a conversion valve, connected to the external ammonia water pipe, the injection pump, and the sample retention bottle. The automatic sample retention device provided by the present invention completes the automatic sample retention and sampling of ammonia water by arranging a conversion valve and an injection pump and corresponding pipelines between the external ammonia water pipe and the sample retention bottle, thereby avoiding direct manual operation of ammonia water and reducing the harm of ammonia water to the human body. Since direct manual operation is not required in the whole process, errors caused by manual operation can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of liquid instrument measurement, and in particular to an automatic sample retention device and a control method thereof. Background Art

[0002] The existing ammonia concentration detection method requires people to sample ammonia on site and send the sampled liquid to the laboratory for testing. Before sampling, the sampling equipment also needs to be cleaned to avoid affecting the actual concentration of ammonia. We know that ammonia is a toxic liquid that is irritating and corrosive to the eyes, nose, and skin; and ammonia is volatile, and the volatility increases with increasing temperature and prolonged storage time. If the entire operation process adopts manual sampling, it will inevitably cause certain harm to the human body.

[0003] In addition, if the operation process is not well controlled during the sampling of ammonia water, the concentration of ammonia water sampled may deviate greatly from the actual concentration of ammonia water. If the equipment for sampling ammonia water is not sophisticated enough, the accuracy of ammonia water concentration detection will be greatly reduced, resulting in a large deviation between the concentration of ammonia water detected and the actual concentration. Summary of the invention

[0004] The present invention provides an automatic sample retaining device and a control method thereof, which can effectively solve the above problems.

[0005] The present invention is achieved in this way: an automatic sample retention device, comprising:

[0006] The box body comprises a first liquid inlet connected to an external ammonia water pipe, a second liquid inlet connected to an external cleaning water pipe, and a liquid outlet arranged at the bottom thereof;

[0007] A sample retaining bottle is fixed on the bottom of the box body, the bottom of the sample retaining bottle is connected to the liquid outlet, and the top of the sample retaining bottle is connected to the second liquid inlet;

[0008] A syringe pump is fixed on the bottom of the box;

[0009] The conversion valve includes a first valve liquid inlet, a first valve liquid outlet, a second valve liquid inlet, and a second valve liquid outlet. The first valve liquid inlet is connected to the external ammonia pipe through the first liquid inlet, the first valve liquid outlet and the second valve liquid inlet are connected to the injection pump, and the second valve liquid outlet is connected to the sample bottle.

[0010] As a further improvement, it further comprises a vacuum pump, whose suction pipe is connected to the top of the sample bottle and whose exhaust pipe is connected to the external air of the box.

[0011] As a further improvement, a first pipeline is defined as a section between the external ammonia water pipe and the conversion valve, and two connectors are provided on the first pipeline at the first liquid inlet.

[0012] As a further improvement, a second pipeline and a third pipeline are respectively arranged between the conversion valve and the injection pump, a first one-way valve is arranged on the second pipeline, and a second one-way valve opposite to the first one-way valve is arranged on the third pipeline.

[0013] As a further improvement, a fifth pipeline is arranged between the sample retention bottle and the second liquid inlet, and a third one-way valve is further arranged on the fifth pipeline.

[0014] As a further improvement, a liquid intake and pressure relief valve is further provided on the box body, and the liquid intake and pressure relief valve is connected to the top of the box body.

[0015] As a further improvement, the liquid outlet further includes a sampling valve, and the sampling valve is connected to the liquid outlet.

[0016] A method for controlling an automatic sample retention device comprises the following steps:

[0017] S1, connect the external cleaning water pipe to the second liquid inlet, only turn on the vacuum pump, start cleaning the sample bottle, after cleaning the sample bottle, open the sampling valve, drain the waste water from the sample bottle, and then close the sampling valve, and enter step S2;

[0018] S2, connecting the external ammonia water pipe to the first liquid inlet, opening all the liquid inlets and liquid outlets of the conversion valve, and starting the injection pump to start cleaning the sampling pipeline; after cleaning the sampling pipeline, opening the sampling valve, draining the waste water from the sample bottle, and then closing the sampling valve, and entering step S3;

[0019] S3, keep the external ammonia water pipe connected to the first liquid inlet, control the conversion valve and the injection pump, and close the vacuum pump and the liquid extraction pressure relief valve to draw the ammonia water into the sample retention bottle to complete the sample retention; proceed to step S4;

[0020] S4, after draining the ammonia water in the sample bottle to the external sampling bottle, repeatedly clean the sample bottle.

[0021] As a further improvement, the step S2 further includes turning on the injection pump and turning off the vacuum pump at the same time, and the sampling pipeline includes: the first pipeline, the second pipeline, the third pipeline and a fourth pipeline between the conversion valve and the sample bottle.

[0022] As a further improvement, in step S3, controlling the conversion valve and the injection pump further includes: opening the first valve liquid inlet and the first valve liquid outlet, and closing the second valve liquid inlet and the second valve liquid outlet, opening the injection pump, and pumping ammonia water into the injection pump; then closing the first valve liquid inlet and the first valve liquid outlet, and opening the second valve liquid inlet and the second valve liquid outlet, and injecting ammonia water into the sample bottle through the injection pump.

[0023] The beneficial effects of the present invention are as follows: the automatic sample retention device provided by the present invention can automatically retain and sample ammonia water by setting a conversion valve, an injection pump and corresponding pipelines between the external ammonia water pipe and the sample retention bottle, thereby avoiding manual direct operation of ammonia water and reducing the harm of ammonia water to the human body. In addition, the conversion valve used has two pairs of water inlets and water outlets, one pair of which is set at the rear end of the external ammonia water pipe, and the other pair of which is set at the front end of the sample retention bottle. When ammonia water starts to enter the pipeline or stops flowing out of the pipeline, it will first pass through the conversion valve, which will consume most of the liquid pressure difference, thereby reducing the damage caused by the liquid pressure difference to other parts of the device. In addition, the conversion valve itself has good wear resistance, acid and alkali resistance, and sealing properties, and has strong tolerance to ammonia water. There will be no leakage or contamination of ammonia water due to long-term corrosion, which further enhances the life of the entire automatic sample retention device and ensures that the actual concentration of ammonia water is not affected; and the conversion valve can achieve complete closure, and no backflow will occur during the process of ammonia water retention and device cleaning to affect the concentration of ammonia water, thereby ensuring the accuracy of ammonia water concentration detection. Since the entire process does not require direct manual operation, but is completed by the automatic sample retention device, errors caused by human operation can be avoided. On the whole, the reliability of the ammonia concentration detection result is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the internal structure of the automatic sample retention device provided in an embodiment of the present invention.

[0026] Figure 2 It is a connection diagram of the conversion valve provided in an embodiment of the present invention.

[0027] Figure 3It is a flow chart of a control method of an automatic sample retention device provided by an embodiment of the present invention.

[0028] Figure 4 It is a schematic diagram of the installation of the automatic sample retention device provided in an embodiment of the present invention.

[0029] Figure 5 It is a schematic diagram of the connection between the first liquid inlet and the external ammonia water pipe provided in an embodiment of the present invention.

[0030] The names of the components corresponding to the marks in the accompanying drawings are:

[0031] 1-box, 11-first liquid inlet, 12-second liquid inlet, 13-liquid outlet, 131-sampling valve, 14-first pipeline, 15-second pipeline, 151-first one-way valve, 16-third pipeline, 161-second one-way valve, 17-fourth pipeline, 18-fifth pipeline, 181-third one-way valve, 19-liquid extraction pressure relief valve, 2-external ammonia pipe, 3-external cleaning water pipe, 4-sample bottle, 5-injection pump , 6-conversion valve, 61-first valve liquid inlet, 62-first valve liquid outlet, 63-second valve liquid inlet, 64-second valve liquid outlet, 7-vacuum pump, 71-intake pipe, 72-exhaust pipe, 8-connecting assembly, 81-hexagonal plastic pipe clamp, 811-clamping part, 812-fastener, 82-adjustment anchor part, 83-pipe welding part, 831-small hole, 84-polytetrafluoroethylene gasket, 85-connecting pipe. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] Reference Figure 1-2 As shown, an automatic sample retention device comprises: a box body 1, comprising a first liquid inlet 11 connected to an external ammonia water pipe 2, a second liquid inlet 12 connected to an external cleaning water pipe 3, and a liquid outlet 13 arranged at the bottom thereof; a sample retention bottle 4, fixed on the bottom of the box body 1, the bottom of the sample retention bottle 4 is connected to the liquid outlet 13, and the top of the sample retention bottle 4 is connected to the second liquid inlet 12; an injection pump 5, fixed on the bottom of the box body 1; a conversion valve 6, comprising a first valve liquid inlet 61, a first valve liquid outlet 62, a second valve liquid inlet 63, and a second valve liquid outlet 64, the first valve liquid inlet 61 is connected to the external ammonia water pipe 2 through the first liquid inlet 11, the first valve liquid outlet 62 and the second valve liquid inlet 63 are connected to the injection pump 5, and the second valve liquid outlet 64 is connected to the sample retention bottle 4.

[0035] Reference Figure 1 As shown, the automatic sample retention device further includes a vacuum pump 7, whose suction pipe 71 is connected to the top of the sample retention bottle 4, and whose exhaust pipe 72 is connected to the external air of the box body 1. When the sample retention bottle 4 needs to be cleaned, the vacuum pump 7 is turned on to exhaust the air in the sample retention bottle 4 so that the clean water in the external cleaning water pipe 3 can enter the sample retention bottle 4.

[0036] In this embodiment, a first pipeline 14 is defined between the external ammonia water pipe 2 and the conversion valve 6 , and two connectors are provided on the first pipeline 14 at the first liquid inlet 11 .

[0037] A second pipeline 15 and a third pipeline 16 are respectively provided between the conversion valve 6 and the injection pump 5, a first one-way valve 151 is provided on the second pipeline 15, and a second one-way valve 161 opposite to the first one-way valve 151 is provided on the third pipeline 16. A fifth pipeline 18 is provided between the sample bottle 4 and the second liquid inlet 12, and a third one-way valve 181 is further provided on the fifth pipeline 18. The fluid passing through the one-way valve can only flow along the water inlet, and the medium at the water outlet cannot flow back.

[0038] The box body 1 is further provided with a liquid extraction pressure relief valve 19, which is connected to the top of the box body 1. When the liquid in the sample bottle 4 needs to be discharged, the liquid extraction pressure relief valve 19 needs to be opened to allow air to enter the sample bottle 4, and then the liquid can flow out.

[0039] The liquid outlet 13 further includes a sampling valve 131, and the sampling valve 131 is connected to the liquid outlet 13. Preferably, the sampling valve 131 is a faucet. When it is necessary to sample the ammonia water, a sampling bottle is arranged at the sampling valve 131 to store the ammonia water.

[0040] Reference Figure 3 As shown, a control method of an automatic sample retention device comprises the following steps:

[0041] S1, connect the external cleaning water pipe 3 to the second liquid inlet 12, only turn on the vacuum pump 7, start cleaning the sample bottle 4, after cleaning the sample bottle 4, open the sampling valve 131, drain the waste water from the sample bottle 4, and then close the sampling valve 131, and enter step S2;

[0042] S2, connecting the external ammonia water pipe 2 to the first liquid inlet 11, opening all the liquid inlets and liquid outlets of the conversion valve 6, and starting the injection pump 5 to start cleaning the sampling pipeline; after cleaning the sampling pipeline, opening the sampling valve 131, draining the waste water from the sample bottle 4, and then closing the sampling valve 131, and entering step S3;

[0043] S3, keep the external ammonia water pipe 2 connected to the first liquid inlet 11, control the conversion valve 6 and the injection pump 5, and close the vacuum pump 7 and the liquid extraction pressure relief valve 19 to pump the ammonia water into the sample retention bottle 4 to complete the sample retention; enter step S4;

[0044] S4, after draining the ammonia water in the sample bottle 4 to the external sampling bottle, repeatedly clean the sample bottle 4.

[0045] In the present invention, the automatic sample retention device is also connected to a control panel that controls its actions. Through the corresponding commands and signals of the control panel, the components of the automatic sample retention device perform related functions. In addition, the pumps and valves related to the automatic sample retention device can also be controlled and reset through the control panel connected thereto. In addition, there is a corresponding waiting time before and after the reset, and after the waiting time, it is manually confirmed whether the reset is performed.

[0046] In step S1, when cleaning the sample bottle, a clean water capacity of 600ml or 1000ml can be selected. When the extracted clean water reaches this capacity, the action of cleaning the sample bottle will automatically stop; or after the desired cleaning effect is achieved, the cleaning can be stopped manually.

[0047] The step S2 further includes turning on the injection pump 5 and turning off the vacuum pump 7, and the sampling pipeline includes: the first pipeline 14, the second pipeline 15, the third pipeline 16, and the fourth pipeline 17 between the conversion valve 6 and the sample bottle 4. At this time, the liquid extraction pressure relief valve 19 is also closed.

[0048] When cleaning the sampling pipeline, the ammonia water sampled this time is used to clean and drain the ammonia water sampled last time remaining in the pipeline, reducing the impact caused by the different concentrations of the ammonia water before and after the two times, and the default capacity of the ammonia water for cleaning the sampling pipeline is 50ml. In this way, the ammonia water remaining in the pipeline during this sampling is the ammonia water sampled this time, and will not affect the sampling concentration this time. In this process, the ammonia water capacity for cleaning the sampling pipeline can be within 50-500ml. When the set capacity for cleaning the sampling pipeline is reached, the cleaning action will stop automatically; or after the desired cleaning effect is achieved, the cleaning can be stopped manually. In the process of cleaning the sampling pipeline, if the liquid level in the sample bottle 4 reaches the upper limit, the current operation of cleaning the sampling pipeline will be automatically stopped, and a buzzer alarm will be heard.

[0049] It should be noted that the above-mentioned upper limit is: when the operating capacity of the sample bottle 4 is below 600ml, when the liquid reaches 600ml, an alarm will be triggered and the liquid will be forced to stop entering the sample bottle 4. When the operating capacity of the sample bottle 4 is above 600ml, when the liquid reaches 1000ml, an alarm will be triggered and the liquid will be forced to stop entering the sample bottle 4.

[0050] In the step S3, the control of the conversion valve 6 and the injection pump 5 further includes: opening the first valve liquid inlet 61 and the first valve liquid outlet 62, and closing the second valve liquid inlet 63 and the second valve liquid outlet 64, opening the injection pump 5, and pumping ammonia water into the injection pump 5; then closing the first valve liquid inlet 61 and the first valve liquid outlet 62, and opening the second valve liquid inlet 63 and the second valve liquid outlet 64, and injecting ammonia water into the sample bottle 4 through the injection pump 5.

[0051] In the present invention, the sealing core seat of the conversion valve used is ceramic, wear-resistant, acid-resistant and alkali-resistant, and relies on the matching motor and sensor for detection and positioning, with high reliability. Its two ceramic surfaces are similar to vacuum, and the inlet and outlet can be completely blocked by rotation.

[0052] Reference Figure 4 As shown, the automatic sample retention device further includes a connection assembly 8, including a hexagonal plastic pipe clamp 81. When the box body 1 is directly placed or fixed on a plane, the clamping portion 811 of the hexagonal plastic pipe clamp 81 (matched with the shape of the external ammonia water pipe 2) is fixed on the external ammonia water pipe 2, and the fasteners 812 around it are fixed on the box body 1. When the box body 1 is fixed in the air, the connection assembly 8 further includes an adjustable anchor 82, one end of which is fixed to the box body 1, and the other end is fixed to the ground or a plane, and the adjustable anchor 82 can be telescopically adjusted in length.

[0053] Reference Figure 5 As shown, the external ammonia water pipe 2 is connected to the first liquid inlet 11 as follows: the connecting component 8 further includes a pipe welding part 83, and the pipe welding part 83 has a small hole 831. During installation, a hole with a diameter of 4-5 mm is processed at the oblique lower part of the external ammonia water pipe 2, and the pipe welding part 83 is welded to the external ammonia water pipe 2. At this time, the small hole 831 of the pipe welding part 83 is directly opposite to the hole processed on the external ammonia water pipe 2; then a polytetrafluoroethylene gasket 84 is added to the other end of the small hole 831 on the pipe welding part 83, and connected to the first liquid inlet 11 through a connecting pipe 85 with joints at both ends.

[0054] In addition, the pump used by the automatic sample retention device is a high-precision piston pump, which automatically takes samples and automatically stores them in a sealed glass jar (sample retention bottle). In this way, the sampling accuracy is high and the speed is fast. The entire sampling process is in a sealed environment, avoiding sample contamination caused by the environment and human sampling process, which affects the accuracy of concentration measurement.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic sample retention device, characterized in that: include: The box body (1) comprises a first liquid inlet (11) connected to an external ammonia water pipe (2), a second liquid inlet (12) connected to an external cleaning water pipe (3), and a liquid outlet (13) arranged at the bottom thereof; A sample retaining bottle (4) is fixed on the box body (1), the bottom of the sample retaining bottle (4) is connected to the liquid outlet (13), and the top of the sample retaining bottle (4) is connected to the second liquid inlet (12); An injection pump (5) fixed on the box (1); The conversion valve (6) is provided with a first valve liquid inlet (61), a first valve liquid outlet (62), a second valve liquid inlet (63), and a second valve liquid outlet (64); the first valve liquid inlet (61) is connected to the external ammonia water pipe (2) via the first liquid inlet (11); the first valve liquid outlet (62) and the second valve liquid inlet (63) are connected to the injection pump (5); and the second valve liquid outlet (64) is connected to the sample retention bottle (4); A second pipeline (15) and a third pipeline (16) are respectively provided between the conversion valve (6) and the injection pump (5); a first one-way valve (151) is provided on the second pipeline (15); and a second one-way valve (161) opposite to the first one-way valve (151) is provided on the third pipeline (16).

2. An automatic sample retention device according to claim 1, characterized in that: It further comprises a vacuum pump (7), whose suction pipe (71) is connected to the top of the sample retention bottle (4), and whose exhaust pipe (72) is connected to the external air of the box (1).

3. An automatic sample retention device according to claim 2, characterized in that: A first pipeline (14) is defined between the external ammonia water pipe (2) and the conversion valve (6), and two connectors are provided on the first pipeline (14) at the first liquid inlet (11).

4. An automatic sample retention device according to claim 1, characterized in that: A fifth pipeline (18) is provided between the sample retention bottle (4) and the second liquid inlet (12), and a third one-way valve (181) is further provided on the fifth pipeline (18).

5. An automatic sample retention device according to claim 3, characterized in that: A liquid intake and pressure relief valve (19) is further provided on the box body (1), and the liquid intake and pressure relief valve (19) is connected to the top of the box body (1).

6. An automatic sample retention device according to claim 5, characterized in that: The liquid outlet (13) further comprises a sampling valve (131), and the sampling valve (131) is connected to the liquid outlet (13).

7. A control method applied to the automatic sample retention device according to claim 6, characterized in that: The following steps are involved: S1, connecting the external cleaning water pipe (3) to the second liquid inlet (12), only turning on the vacuum pump (7), cleaning the sample bottle (4), and after the sample bottle (4) is cleaned, opening the sampling valve (131), draining the waste water from the sample bottle (4), and then closing the sampling valve (131), and entering step S2; S2, connecting the external ammonia water pipe (2) to the first liquid inlet (11), opening all the liquid inlets and liquid outlets of the conversion valve (6), and starting the injection pump (5) to start cleaning the sampling pipeline; after cleaning the sampling pipeline, opening the sampling valve (131), draining the waste water from the sample bottle (4), and then closing the sampling valve (131), and entering step S3; S3, keeping the external ammonia water pipe (2) connected to the first liquid inlet (11), controlling the conversion valve (6) and the injection pump (5), and closing the vacuum pump (7) and the liquid extraction pressure relief valve (19), so as to draw the ammonia water into the sample retention bottle (4), and complete the sample retention; proceeding to step S4; S4, after the ammonia water in the sample retaining bottle (4) is completely discharged to the external sampling bottle, the sample retaining bottle (4) is repeatedly cleaned.

8. The method for controlling an automatic sample retention device according to claim 7, characterized in that: The step S2 further comprises starting the injection pump (5) and closing the vacuum pump (7) at the same time, wherein the sampling pipeline comprises: the first pipeline (14), the second pipeline (15), the third pipeline (16) and a fourth pipeline (17) between the conversion valve (6) and the sample bottle (4).

9. The method for controlling an automatic sample retention device according to claim 7, characterized in that: In the step S3, the control of the conversion valve (6) and the injection pump (5) further includes: opening the first valve liquid inlet (61) and the first valve liquid outlet (62), and closing the second valve liquid inlet (63) and the second valve liquid outlet (64), opening the injection pump (5), and pumping ammonia water into the injection pump (5); then closing the first valve liquid inlet (61) and the first valve liquid outlet (62), and opening the second valve liquid inlet (63) and the second valve liquid outlet (64), and injecting ammonia water into the sample bottle (4) through the injection pump (5).

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