Continuous micro-sampling device for water quality detection

Abstract

The utility model discloses a continuous micro-sampling device for water quality detection, which comprises a liquid storage tank with a hard mounting part and a flexible deformation part, and a self-sealing liquid outlet dropper is arranged at the bottom of the liquid storage tank; the liquid adding device is connected with the hard mounting part so as to inject the sample liquid to be detected into the liquid storage tank; the servo liquid outlet mechanism is used for applying pressure to the flexible deformation part to enable the flexible deformation part to deform to control the volume variation in the liquid storage tank, so that the to-be-detected sample liquid with the corresponding volume is discharged from the liquid outlet dropper to realize sampling. During sampling, the step pitch of the servo liquid outlet mechanism is set according to the required sampling volume, the flexible deformation part is pressed when the servo liquid outlet mechanism acts, the volume in the liquid storage tank is correspondingly changed after the flexible deformation part deforms, and at the moment, to-be-detected sample liquid with the corresponding volume can be discharged from the liquid outlet dropper and is dropped on test paper arranged below the liquid outlet dropper; and the servo liquid outlet mechanism continuously moves by a corresponding step pitch, so that continuous micro-sampling can be realized, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid micro-sampling, in particular to a continuous micro-sampling device for water quality detection. Background Art

[0002] Water quality detection is one of the key links in scenarios such as environmental water monitoring and drinking water quality control. At present, in the micro-sampling scenario for water quality detection, usually, a liquid sampling device such as a pipette or a dropper is used by an operator to suck the sample liquid and then drop it on the test paper. According to the color change of the test paper, a colorimetric card is used for comparison to obtain various indicators in the water sample. However, when using a pipette, a dropper or other methods for liquid sampling, it can only be carried out single time in sequence, that is, after taking a sample and adding the liquid, the next sampling is carried out. Repeated sampling requires a lot of time cost, resulting in low overall detection efficiency and difficult to meet the needs of batch detection. Summary of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a continuous micro-sampling device for water quality detection, which has the advantages of realizing continuous micro-sampling and improving detection efficiency.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] According to an embodiment of the present disclosure, a continuous micro-sampling device for water quality detection is provided, including:

[0006] A liquid storage tank having a rigid mounting portion and a flexible deformation portion, and a self-sealing liquid discharge dropper is provided at the bottom of the liquid storage tank;

[0007] A liquid adding device connected to the rigid mounting portion to inject a sample liquid to be measured into the liquid storage tank;

[0008] A servo liquid discharge mechanism for pressing the flexible deformation portion to cause the flexible deformation portion to deform and control the change amount of the internal volume of the liquid storage tank, so as to discharge a corresponding volume of the sample liquid to be measured from the liquid discharge dropper to realize sampling.

[0009] To implement the above technical solution, during the sampling operation, first, the liquid adding device is used to fill the liquid storage tank with the sample liquid to be tested. During the liquid injection process, since the liquid outlet dropper can form a self-sealing, there will be no liquid leakage. During the liquid injection process, the air in the liquid storage tank will be gradually discharged, causing the air pressure in the liquid storage tank to decrease. When the liquid storage tank is filled with the sample liquid to be tested, the liquid adding part of the liquid storage tank is sealed, making the external air pressure greater than the air pressure in the liquid storage tank. Under the action of the atmospheric pressure, there will also be no liquid leakage at the liquid outlet dropper during the subsequent sampling process; during sampling, according to the required sampling volume, the step distance of the servo liquid outlet mechanism is set. When the servo liquid outlet mechanism operates, it presses on the flexible deformation part. After the flexible deformation part deforms, it will correspondingly change the volume in the liquid storage tank. At this time, the corresponding volume of the sample liquid to be tested can be discharged from the liquid outlet dropper and dripped onto the test paper placed below it to complete the sampling operation. The servo liquid outlet mechanism continuously moves the corresponding step distance, and continuous micro-sampling can be achieved without repeated sampling, improving the detection efficiency.

[0010] In some exemplary embodiments, the flexible deformation part is hermetically connected to the rigid mounting part through a deformation wall that can achieve overall telescopic changes according to a predetermined rule.

[0011] In some exemplary embodiments, the deformation wall is serrated and / or corrugated and can be telescopically folded, and the predetermined rule is that when the deformation wall undergoes telescopic changes, its internal volume changes linearly.

[0012] Implementing the above technical solution enables the flexible deformation part to achieve overall telescopic changes, improving the controllability of the volume change of the liquid storage tank.

[0013] In some exemplary embodiments, a flexible sealing film is hermetically connected to the inner side of the deformation wall. In the initial state of the flexible deformation part, the flexible sealing film is in a straightened state.

[0014] Implementing the above technical solution restricts the shape of the liquid storage space of the flexible deformation part through the flexible sealing film, making the liquid storage space of this part form a regular cube to more precisely control the volume of the liquid discharged.

[0015] In some exemplary embodiments, a push plate is provided on the outer side of the flexible deformation part, and the push plate is used to connect to the servo liquid outlet mechanism.

[0016] Implementing the above technical solution, the setting of the push plate enables the flexible deformation part to deform as a whole during sampling, further facilitating the improvement of sampling accuracy.

[0017] In some exemplary embodiments, the servo liquid outlet mechanism is selected from the following structures alone or in combination: a cam mechanism, a link mechanism, a gear-rack mechanism, or a servo lead screw mechanism;

[0018] The power output end of the servo liquid outlet mechanism is connected to the push plate to drive the flexible deformation part to compress inward or stretch outward.

[0019] To achieve the above technical solution, the compression or reset of the flexible deformation part is realized through the servo liquid outlet mechanism.

[0020] In some exemplary embodiments, an airbag is provided inside the rigid mounting part, and the inflation port of the airbag extends out of the rigid mounting part and is connected to an inflation device. The airbag is used to adjust the volume inside the liquid storage tank so that the sample liquid to be measured remains full in the liquid storage tank.

[0021] To achieve the above technical solution, when the liquid storage tank is not filled with the sample liquid to be measured, the airbag can be inflated through the inflation device. During the inflation process, the airbag gradually fills the liquid storage tank, so that when sampling, the sample liquid to be measured can only be discharged from the liquid outlet dropper, further improving the sampling accuracy; since the sample liquid to be measured in the rigid mounting part cannot be discharged due to the deformation of the flexible deformation part and can only be discharged passively and discarded after sampling, the inflation of the airbag can reduce the liquid storage space in the rigid mounting part, thereby reducing the waste of the sample liquid to be measured.

[0022] In some exemplary embodiments, a liquid injection port is provided at the top of the rigid mounting part, and the liquid adding device includes:

[0023] A liquid injection pipe, one end of which is connected to the liquid injection port and the other end is connected to an infusion pump, and the infusion pump is arranged in the liquid storage pool of the sample liquid to be measured;

[0024] A liquid supply valve, which is connected between the liquid injection port and the liquid injection pipe and is used to control the on-off of the liquid injection pipe.

[0025] To achieve the above technical solution, when injecting liquid, the infusion pump works and the liquid supply valve is opened, and the sample liquid to be measured in the liquid storage pool is pumped out and injected into the liquid storage tank from the liquid injection port through the liquid injection pipe. After the liquid storage tank is filled, the infusion pump stops and the liquid supply valve is closed to keep the liquid injection port in a sealed state.

[0026] In some exemplary embodiments, a liquid injection port is provided at the top of the rigid mounting part, and a sealing joint is provided at the liquid injection port. The liquid adding device includes:

[0027] A liquid adding head, which is connected to an infusion pump through an infusion hose, and the infusion pump is arranged in the liquid storage pool of the sample liquid to be measured;

[0028] A servo moving mechanism, which is used to drive the liquid adding head to move along the horizontal plane and the vertical plane;

[0029] When adding liquid, the servo moving mechanism drives the liquid adding head to move directly above the liquid injection port and inserts it into the sealing joint to open the sealing joint and inject liquid into the liquid storage tank; when the servo moving mechanism drives the liquid adding head to disengage from the sealing joint, the sealing joint is in a self-sealing state.

[0030] To achieve the above technical solution, the servo moving mechanism can drive the liquid adding head to move to different liquid storage tanks, thereby realizing liquid injection into different liquid storage tanks and expanding the scope of application.

[0031] In some exemplary embodiments, the sealing joint includes:

[0032] A joint body connected to the liquid injection port, and the upper end of the joint body is provided with an inwardly recessed sealing section;

[0033] A movable guide ring fixed in the joint body, a guide hole is provided in the middle of the movable guide ring, and a plurality of water through holes are provided around the guide hole;

[0034] A sealing plug slidably assembled in the guide hole through a guide post, the sealing plug can be hermetically connected to the sealing section, and when the sealing section is pushed away from the sealing section by the liquid adding head, the sealing head is opened; and,

[0035] An elastic reset member sleeved on the guide post, one end of the elastic reset member abuts against the movable guide ring, the other end abuts against the bottom of the sealing plug, and when the elastic reset member is in a natural state, it abuts against the sealing plug and is hermetically connected to the sealing section to form a self-sealing state.

[0036] To achieve the above technical solution, when the liquid adding head is inserted into the joint body, it pushes the sealing plug downward, and the movable guide ring and the guide hole guide the sliding of the sealing plug. When the sealing plug disengages from the sealing section, the gap formed between the sealing plug and the sealing section can allow the sample liquid to be measured to flow in, and then it can be injected into the liquid storage tank through the water through holes; when the liquid storage tank is full and the liquid adding head moves upward and disengages from the joint body, the sealing plug is reset under the elastic force of the elastic reset member and reseals with the sealing section to form a self-sealing state.

[0037] In some exemplary embodiments, the bottom of the rigid mounting portion is provided with a liquid outlet corresponding to the liquid droplet head, a connecting rod connected to the push plate is provided in the liquid storage tank, and a sealing plate is provided at the end of the connecting rod. In the initial state of the flexible deformation portion, the sealing plate seals the liquid outlet.

[0038] To implement the above technical solution, in the initial state of the flexible deformation part, the sealing plate exactly blocks the liquid outlet to prevent leakage during the liquid injection process. During sampling, the push plate moves as a whole, thereby driving the sealing plate to move through the connecting rod to open the liquid outlet, and the sample liquid to be measured can be discharged from the liquid outlet nozzle to complete the sampling. Since the liquid injection port is sealed after liquid injection and the internal and external air pressures are kept consistent, the liquid outlet nozzle part will not leak automatically when the sealing plate is opened. Only when the flexible deformation part is compressed and deformed will the corresponding volume of the sample liquid to be measured be discharged.

[0039] In some exemplary embodiments, the liquid outlet is arranged as a long strip, an ellipse or an oval that is parallel to the push plate.

[0040] To implement the above technical solution, when sampling for the first time, the sealing plate can quickly open the liquid outlet to facilitate the sampling process.

[0041] In some exemplary embodiments, the liquid outlet nozzle includes:

[0042] A drip head body is fixed to the bottom of the rigid mounting part. A main flow channel is provided through the middle of the drip head body, and a plurality of auxiliary flow channels are communicated with the main flow channel. The first end of the auxiliary flow channel is communicated with the upper part of the main flow channel, and the second end is communicated with the lower part of the main flow channel. An installation part is formed between the auxiliary flow channel and the main flow channel in the drip head body;

[0043] A plug that is slidably assembled in the main flow channel, and the plug is used to block or open the first end of the auxiliary flow channel; and,

[0044] An elastic pressing member with one end abutted against the installation part and the other end abutted against the bottom of the plug. In the natural state, the elastic pressing member drives the plug to block the first end of the auxiliary flow channel.

[0045] To implement the above technical solution, when not sampling, the plug remains in the state of blocking the first end of the auxiliary flow channel under the action of the elastic pressing member. When the flexible deformation part is compressed for sampling, the sample liquid to be measured in the liquid storage tank is pressurized, and the water pressure acts on the plug to make the plug move downward, opening the first end of the auxiliary flow channel. The corresponding sample liquid to be measured can flow out from the auxiliary flow channel, and finally converge into the main flow channel and be discharged from the drip head body to complete the sampling process; after flowing out the corresponding volume of the sample liquid to be measured, the water pressure will recover, and the plug can move upward again under the action of the elastic force of the elastic pressing member to close the first end of the auxiliary flow channel, realizing the self-sealing of the liquid outlet nozzle.

[0046] In some exemplary embodiments, an installation groove is formed in the installation part. A limiting block extending into the installation groove is provided at the bottom of the plug. The elastic pressing member is embedded in the installation groove, and the limiting block can abut against the top wall of the installation groove to limit the blocking position of the plug.

[0047] To implement the above technical solution, the upper movement position of the plug can be restricted by the limit block to ensure the accuracy of the plugging position, while the lower movement position of the plug can be determined by the deformation amount of the elastic pressing member, and the limit position is when the elastic pressing member is completely compressed.

[0048] In some exemplary embodiments, a conduit is provided at the bottom of the rigid mounting portion, the liquid discharge dropper is connected to the conduit, and a micro-control valve is connected to the conduit.

[0049] To implement the above technical solution, during sampling, the micro-control valve is opened, and the sample liquid to be measured can be discharged from the liquid discharge dropper. During liquid injection, the micro-control valve is closed, and the self-sealing state of the liquid discharge dropper can be achieved.

[0050] In some exemplary embodiments, a water immersion sensor is provided on the top of the rigid mounting portion for detecting the liquid level in the liquid storage tank.

[0051] To implement the above technical solution, by providing the water immersion sensor, when the liquid storage tank is filled with the sample liquid to be measured, it will contact the water immersion sensor and generate a water immersion signal, indicating that the liquid storage tank is full of the sample liquid to be measured.

[0052] In some exemplary embodiments, a water pressure sensor is provided at the liquid discharge dropper, and a full water signal is generated when the water pressure sensor detects that the water pressure value reaches a predetermined threshold.

[0053] To implement the above technical solution, during the process of injecting liquid into the liquid storage tank, water pressure will act on the water pressure sensor. When the water pressure value detected by the water pressure sensor reaches a predetermined threshold, it indicates that the water level reaches the upper limit, and a full water signal is generated.

[0054] In summary, compared with the prior art, the present utility model has the following beneficial effects:

[0055] Embodiments of the present utility model provide a continuous micro-sampling device for water quality detection, including: a liquid storage tank having a rigid mounting portion and a flexible deformation portion, the bottom of the liquid storage tank being provided with a self-sealing liquid discharging drip head; a liquid adding device connected to the rigid mounting portion to inject a sample liquid to be detected into the liquid storage tank; and a servo liquid discharging mechanism for pressing the flexible deformation portion to cause the flexible deformation portion to deform, controlling the change in the internal volume of the liquid storage tank, and discharging a corresponding volume of the sample liquid to be detected from the liquid discharging drip head to achieve sampling. During the sampling operation, first, the sample liquid to be detected is filled into the liquid storage tank through the liquid adding device. Since the liquid discharging drip head can form a self-sealing during the liquid injection process, there will be no liquid leakage. And during the liquid injection process, the air in the liquid storage tank will be gradually discharged, causing the air pressure in the liquid storage tank to decrease. When the liquid storage tank is filled with the sample liquid to be detected, the liquid adding part of the liquid storage tank is sealed, making the external air pressure greater than the air pressure in the liquid storage tank. Under the action of the atmospheric pressure, there will be no liquid leakage at the liquid discharging drip head during the subsequent sampling process. During sampling, according to the required sampling volume, the step distance of the servo liquid discharging mechanism is set. When the servo liquid discharging mechanism operates, it presses the flexible deformation portion. After the flexible deformation portion deforms, it will correspondingly change the volume in the liquid storage tank. At this time, a corresponding volume of the sample liquid to be detected can be discharged from the liquid discharging drip head and dropped onto the test paper placed below it to achieve the sampling operation. The servo liquid discharging mechanism continuously moves the corresponding step distance, and continuous micro-sampling can be achieved without reciprocating sampling. And by setting the sampling period of the servo liquid discharging mechanism, periodic continuous sampling can be achieved, reducing manual intervention and improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present utility model.

[0057] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present utility model.

[0058] Figure 3 It is a schematic structural diagram of Embodiment 3 of the present utility model.

[0059] Figure 4 It is a schematic structural diagram of the sealing joint in Embodiment 3 of the present utility model.

[0060] Figure 5 It is a schematic structural diagram of the movable guide ring in Embodiment 3 of the present utility model.

[0061] Figure 6 It is a schematic structural diagram of Embodiment 4 of the present utility model.

[0062] Figure 7 It is a schematic structural diagram of the liquid discharging drip head in Embodiment 4 of the present utility model.

[0063] Figure 8 It is a schematic structural diagram of Embodiment 5 of the present utility model.

[0064] The corresponding component names represented by the numbers and letters in the figure:

[0065] 10. Liquid storage tank; 11. Rigid installation part; 111. Liquid injection port; 112. Liquid outlet; 113. Conduit; 114. Micro control valve; 115. Water immersion sensor; 116. Water pressure sensor; 12. Flexible deformation part; 121. Deformation wall; 122. Flexible sealing film; 123. Push plate; 13. Sealing joint; 131. Joint body; 132. Sealing section; 133. Movable guide ring; 134. Guide hole; 135. Water passing port; 136. Sealing plug; 137. Elastic reset part; 138. Guide post; 20. Liquid outlet dropper head; 21. Connecting rod; 22. Sealing plate; 23. Dropper head body; 24. Main flow channel; 25. Auxiliary flow channel; 26. Installation part; 27. Plug; 28. Elastic pressing part; 29. Limit block; 30. Liquid adding device; 31. Liquid injection pipe; 32. Liquid infusion pump; 33. Liquid supply valve; 34. Liquid adding head; 35. Liquid infusion hose; 36. Servo moving mechanism; 40. Servo liquid outlet mechanism; 50. Air bag; 51. Inflation port; 52. Inflation equipment. Specific embodiments

[0066] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0067] Embodiment 1

[0068] As Figure 1 shown, the embodiment of the present utility model provides a water quality detection continuous micro-sampling device, including: a liquid storage tank 10 having a rigid installation part 11 and a flexible deformation part 12, and a self-sealing liquid outlet dropper head 20 is provided at the bottom of the liquid storage tank 10; a liquid adding device 30 connected to the rigid installation part 11 to inject a sample liquid to be tested into the liquid storage tank 10; a servo liquid outlet mechanism 40 for pressing the flexible deformation part 12 to cause the flexible deformation part 12 to deform, controlling the change amount of the internal volume of the liquid storage tank 10, and discharging a corresponding volume of the sample liquid to be tested from the liquid outlet dropper head 20 to achieve sampling.

[0069] Specifically, the rigid mounting portion 11 can be made of a metal material such as stainless steel, and the flexible deformation portion 12 is preferably made of a plastic material. It has the ability to bend and deform, but will not easily deform in ways such as expansion when subjected to water pressure. The flexible deformation portion 12 is hermetically connected to the rigid mounting portion 11 through a deformation wall 121 that can achieve overall telescopic changes according to a predetermined law. Specifically: the periphery of the flexible deformation portion 12 is the deformation wall 121, and the end of the deformation wall 121 is hermetically connected to the end face of the rigid mounting portion 11 by means such as gluing and heat melting. The side surface of the flexible sealing portion is planar, and the predetermined law is that when the deformation wall 121 expands and contracts, its internal volume changes linearly, that is, the telescopic change distance of the deformation wall 121 and the volume change amount change in a linear proportion. For example, the deformation wall 121 is serrated and / or corrugated and can be telescopically folded, that is, the deformation wall 121 can be continuously serrated, continuously corrugated, or alternately changed in a serrated and corrugated manner. In this embodiment, the deformation wall 121 is preferably serrated. The serrated deformation wall 121 enables the flexible deformation portion 12 to achieve overall telescopic changes, improving the controllability of the volume change of the liquid storage tank 10; of course, in other embodiments, other similar shapes can also be used, and the present invention does not limit this.

[0070] A flexible sealing film 122 is hermetically connected to the inner side of the deformation wall 121. In the initial state of the flexible deformation portion 12, the flexible sealing film 122 is in a straightened state. The flexible sealing film 122 is made of a plastic film such as PVC. It can be folded and deformed but is not easily elastically deformed. Of course, in some embodiments, a number of folding marks corresponding to the deformation wall 121 can also be provided on the flexible sealing film 122, so that the flexible sealing film 122 can be folded and deformed synchronously when the flexible deformation portion 12 deforms; the shape of the liquid storage space of the flexible deformation portion 12 is restricted by the flexible sealing film 122, so that the liquid storage space of this part forms a regular cube, in order to more accurately control the volume of the liquid discharged.

[0071] Furthermore, a push plate 123 is provided on the outer side of the flexible deformation portion 12. The push plate 123 can be fixed to the side surface of the flexible deformation portion 12 by means such as bonding and riveting, and the push plate 123 can cover the entire side surface of the flexible deformation portion 12. The push plate 123 is used to be connected to the servo liquid discharging mechanism 40. Usually, a connection joint can be provided in the middle of the push plate 123 for driving connection with the power output end of the servo liquid discharging mechanism 40. The setting of the push plate 123 enables the flexible deformation portion 12 to deform as a whole during sampling, which further helps to improve the sampling accuracy.

[0072] The servo liquid outlet mechanism 40 is selected from the following structures for individual or combined application: a cam mechanism, a connecting rod 21 mechanism, a rack and pinion mechanism, or a servo lead screw mechanism. The power output end of the servo liquid outlet mechanism 40 is connected to the push plate 123 to drive the flexible deformation part 12 to compress inward or stretch outward, and the compression or reset of the flexible deformation part 12 is realized through the servo liquid outlet mechanism 40. In this embodiment, the servo liquid outlet mechanism 40 preferably adopts a servo lead screw mechanism, which can be an existing servo electric cylinder or composed of a servo motor connected to a lead screw. The lead screw is threadedly connected with a slidable slider, and the slider is connected to the push plate 123, so as to drive the push plate 123 to move back and forth.

[0073] A liquid injection port 111 is provided at the top of the hard mounting part 11. The liquid adding device 30 includes: a liquid injection pipe 31, one end of which is connected to the liquid injection port 111 and the other end is connected to an infusion pump 32. The infusion pump 32 is arranged in the storage tank of the sample liquid to be measured. The liquid injection pipe 31 preferably can adopt a rubber hose for easy installation; a liquid supply valve 33, which is connected between the liquid injection port 111 and the liquid injection pipe 31 and is used to control the on-off of the liquid injection pipe 31. The liquid supply valve 33 adopts an electromagnetic valve, which is linked with the infusion pump 32 for control, that is, when the infusion pump 32 works, the liquid supply valve 33 is opened, and when the infusion pump 32 stops, the liquid supply valve 33 is closed. When injecting liquid, the infusion pump 32 works and the liquid supply valve 33 is opened, and the sample liquid to be measured in the storage tank is pumped out and injected into the storage tank 10 from the liquid injection port 111 through the liquid injection pipe 31. After the storage tank 10 is filled, the infusion pump 32 stops and the liquid supply valve 33 is closed to keep the liquid injection port 111 in a sealed state.

[0074] A liquid outlet 112 corresponding to the liquid outlet dropper 20 is provided at the bottom of the hard mounting part 11. A connecting rod 21 connected to the push plate 123 is arranged in the storage tank 10. A sealing plate 22 is provided at the end of the connecting rod 21. In the initial state of the flexible deformation part 12, the sealing plate 22 blocks the liquid outlet 112. The sealing plate 22 is adapted to the liquid outlet 112 and is made of a better material such as rubber sealant. The area of the sealing plate 22 is slightly larger than the liquid outlet 112 to ensure that it can completely cover and block the liquid outlet 112. Usually, in order to improve the sealing performance between the sealing plate 22 and the liquid outlet 112, the connecting rod 21 can be set as a plate-like structure with a certain elasticity, so that a certain elastic force can be generated between the sealing plate 22 and the hard mounting part 11, so that the sealing plate 22 can closely fit and seal the liquid outlet 112.

[0075] In the initial state of the flexible deformation part 12, that is, the fully expanded state of the flexible deformation part 12, the sealing plate 22 just blocks the liquid outlet 112 to prevent leakage during the injection process. When sampling, the push plate 123 will move as a whole, thereby driving the sealing plate 22 to move through the connecting rod 21 to open the liquid outlet 112, and the sample liquid can be discharged from the liquid outlet drip head 20 to complete the sampling. Since the liquid injection port 111 is sealed after the injection, the air in the liquid storage tank 10 will be gradually discharged during the injection process, so that the external air pressure is greater than the air pressure in the liquid storage tank 10 after the injection is completed. Under the action of atmospheric pressure, when the sealing plate 22 is opened, the liquid outlet drip head 20 part will not leak automatically, and only when the flexible deformation part 12 is compressed and deformed will the corresponding volume of the sample liquid to be tested be discharged.

[0076] Preferably, the liquid outlet 112 is arranged in a long strip, oval or oval shape parallel to the push plate 123. In the present embodiment, a long strip is adopted. During the initial sampling, the sealing plate 22 can quickly open the liquid outlet 112 to facilitate the sampling process. Compared with the setting of the circular hole, the setting of the long strip hole is slightly offset from the liquid outlet 112, so that it can have a larger liquid outlet area, and thus it is easier to discharge the liquid in time.

[0077] In this embodiment, a water immersion sensor 115 is provided on the top of the hard mounting portion 11 for detecting the liquid level in the liquid storage tank 10. By providing the water immersion sensor 115, when the liquid storage tank 10 is filled with the sample liquid to be tested, the water immersion sensor 115 is contacted to generate a water immersion signal, indicating that the liquid storage tank 10 is full of the sample liquid to be tested. At this time, the infusion pump 32 is controlled to stop injecting liquid.

[0078] Alternatively, in other embodiments, a water pressure sensor 116 may be provided at the liquid droplet outlet 20. The water pressure sensor 116 generates a full water signal when it detects that the water pressure value reaches a predetermined threshold value. During the process of filling the liquid storage tank 10, water pressure will be generated on the water pressure sensor 116. When the water pressure value detected by the water pressure sensor 116 reaches a predetermined threshold value, it indicates that the water level has reached the upper limit, and a full water signal is generated.

[0079] Of course, other methods of detecting the water level of the liquid storage tank 10 are also applicable, and the present embodiment is not limited thereto.

[0080] When performing sampling operations, first, the liquid adding device 30 is used to fill the liquid storage tank 10 with the sample liquid to be tested. During the liquid injection process, since the liquid outlet dropper 20 can form a self-sealing, there will be no liquid leakage. During the liquid injection process, the air in the liquid storage tank 10 will be gradually discharged, causing the air pressure in the liquid storage tank 10 to decrease. When the liquid storage tank 10 is filled with the sample liquid to be tested, the liquid adding part of the liquid storage tank 10 is sealed, making the external air pressure greater than the air pressure in the liquid storage tank 10. Under the action of the atmospheric pressure, there will also be no liquid leakage at the liquid outlet dropper 20 during the subsequent sampling process; during sampling, according to the required sampling volume, the step distance of the servo liquid outlet mechanism 40 is set. When the servo liquid outlet mechanism 40 operates, it presses on the flexible deformation part 12. After the flexible deformation part 12 deforms, it will correspondingly change the volume in the liquid storage tank 10. At this time, the corresponding volume of the sample liquid to be tested can be discharged from the liquid outlet dropper 20 and dropped onto the test paper placed below it to complete the sampling action. The servo liquid outlet mechanism 40 continuously moves the corresponding step distance, enabling continuous micro-sampling without the need for reciprocating sampling, and can achieve periodic continuous sampling by setting the sampling period of the servo liquid outlet mechanism 40, reducing manual intervention and improving the detection efficiency.

[0081] When micro-sampling different types of water samples is required, the liquid storage tank 10 needs to be cleaned first. Each time after testing a water sample, a cleaning operation is performed. At this time, a cleaning pipe can be connected to the liquid injection pipe 31 through a pipe joint, and a cleaning valve also needs to be connected to the cleaning pipe. The cleaning pipe can be directly connected to a faucet, and by opening the faucet, tap water can be discharged into the liquid storage tank 10 for cleaning. Or it can be connected to a cleaning pump, and the cleaning pump is placed in a pool storing cleaning liquid. By starting the cleaning pump, the cleaning liquid can be injected into the liquid storage tank 10 for cleaning; during the cleaning process, the liquid supply valve 33 is in a closed state, and the liquid outlet dropper 20 can be in a sealed state. After the water or cleaning liquid fills the liquid storage tank 10, opening the liquid outlet dropper 20 for discharging can complete the cleaning. During the liquid injection process, by impacting and disturbing the water flow in the liquid storage tank 10 with a certain water pressure, a better cleaning effect can be achieved.

[0082] Embodiment 2

[0083] The difference between this embodiment and other embodiments is that as Figure 2 shown, in this embodiment, in order to further improve the sampling accuracy, an airbag 50 is provided inside the rigid mounting part 11. The inflation port 51 of the airbag 50 extends out of the rigid mounting part 11 and is connected to an inflation device 52. The airbag 50 is used to adjust the volume in the liquid storage tank 10 so that the sample liquid to be tested remains in a full liquid state in the liquid storage tank 10. The airbag 50 is also made of a plastic film that is not prone to elastic deformation, and one side of the airbag 50 is attached to the side wall of the rigid mounting part 11. Thus, its expansion direction is controllable during inflation. The inflation port 51 of the airbag 50 and the side wall of the rigid mounting part 11 are sealed and connected by sealant, and the inflation device 52 can use existing equipment.

[0084] When the liquid storage tank 10 is not filled with the sample liquid, if sampling is performed at this time, when the flexible deformation part 12 is compressed, since there is still space on the upper part of the liquid storage tank 10, the sample liquid will be preferably filled to the top, and will not be discharged from the liquid droplet outlet 20, which will lead to a large sampling error or the inability to complete the sampling. The normal sampling process can not be carried out until the flexible deformation part 12 is deformed until the sample liquid completely fills the space in the liquid storage tank 10; therefore, the airbag 50 can be inflated by the inflation device 52, and the airbag 50 gradually fills the liquid storage tank 10 during the expansion process, so that the sample liquid can only be discharged from the liquid droplet outlet 20 during sampling, which further improves the sampling accuracy; since the sample liquid in the hard mounting part 11 cannot be discharged due to the deformation of the flexible deformation part 12, it can only be passively discharged and discarded after the sampling is completed. After the inflation of the airbag 50, the liquid storage space of the hard mounting part 11 can be reduced, thereby reducing the waste of the sample liquid.

[0085] The inflation action can be controlled by the detection action of the water immersion sensor 115 or the water pressure sensor 116, that is, when the water immersion signal and the full water signal are received, the inflation device 52 is controlled to stop inflating. Of course, in some embodiments, a pressure sensor can also be provided on the airbag 50. When the airbag 50 is inflated to the point where the pressure value generated between the airbag 50 and the sample liquid to be tested reaches a predetermined threshold, it indicates that the airbag has been fully inflated.

[0086] Embodiment 3

[0087] The difference between this embodiment and other embodiments is that: Figures 3 to 5 As shown, in this embodiment, a liquid injection port 111 is provided at the top of the hard mounting portion 11, and a sealing joint 13 is provided at the liquid injection port 111. The liquid adding device 30 includes: a liquid adding head 34, which is connected to an infusion pump 32 through an infusion hose 35. The infusion pump 32 is arranged in a liquid storage tank of the sample liquid to be tested, and a plurality of openings may be provided on the side of the liquid adding head 34 for outputting the sample liquid to be tested; a servo moving mechanism 36, which is used to drive the liquid adding head 34 to move along the horizontal plane and the vertical plane. The servo moving mechanism 36 adopts an existing two-axis or three-axis servo screw mechanism, which is selected according to actual needs, but at least horizontal plane movement and longitudinal vertical movement must be achieved.

[0088] When adding liquid, the servo moving mechanism 36 drives the liquid adding head 34 to move to just above the liquid filling port 111, and inserts it into the sealing joint 13 to open the sealing joint 13 to inject liquid into the liquid storage tank 10; when the servo moving mechanism 36 drives the liquid adding head 34 to detach from the sealing joint 13, the sealing joint 13 is in a self-sealing state.

[0089] The servo moving mechanism 36 can drive the liquid adding head 34 to move to different liquid storage tanks 10 , thereby achieving liquid injection into different liquid storage tanks 10 , thereby expanding the scope of application.

[0090] Specifically, the sealing joint 13 includes: a joint body 131 communicating with the liquid injection port 111, and a sealing section 132 recessed inwardly is provided at the upper end of the joint body 131; a movable guide ring 133 fixed inside the joint body 131, a guide hole 134 is provided in the middle of the movable guide ring 133, and a plurality of water through holes 135 are provided around the guide hole 134; a sealing plug 136 slidably assembled in the guide hole 134 through a guide post 138, the sealing plug 136 can be hermetically connected to the sealing section 132, and when the sealing section 132 is pushed away from the sealing section 132 by the liquid adding head 34, the sealing head is opened; and, an elastic reset member 137 sleeved on the guide post 138, one end of the elastic reset member 137 abuts against the movable guide ring 133, the other end abuts against the bottom of the sealing plug 136, and when the elastic reset member 137 is in a natural state, it abuts against the sealing plug 136 and is hermetically connected to the sealing section 132 to form a self-sealing state.

[0091] Generally, a guiding port is provided at the opening of the joint body 131 above the sealing section 132 for the liquid adding head 34 to be inserted. And in order to improve the guiding performance of the guide post 138, a guide sleeve structure is also provided on the movable guide ring 133 at the position of the guide hole 134, and the guide post 138 is inserted into the guide sleeve structure to achieve the sliding fit between the two. The elastic reset member 137 is a spring.

[0092] When the liquid adding head 34 is inserted into the joint body 131, it pushes the sealing plug 136 downward, and the movable guide ring 133 and the guide hole 134 guide the sliding of the sealing plug 136. When the sealing plug 136 is separated from the sealing section 132, the gap formed between the sealing plug 136 and the sealing section 132 can allow the sample liquid to be measured to flow in, and then it can be injected into the liquid storage tank 10 through the water through holes 135; when the liquid storage tank 10 is full and the liquid adding head 34 is lifted and separated from the joint body 131, the sealing plug 136 is reset under the elastic force of the elastic reset member 137 and re-sealingly contacts the sealing section 132 to form a self-sealing state.

[0093] In this embodiment during cleaning, the cleaning pipe can be directly inserted into the joint body 131 to inject water or cleaning liquid into the liquid storage tank 10 for cleaning operation.

[0094] Embodiment 4

[0095] The difference between this embodiment and other embodiments is that as Figure 6 and Figure 7As shown in the figure, in this embodiment, the liquid outlet droplet head 20 includes: a droplet head body 23 fixed to the bottom of the rigid mounting portion 11. A main flow channel 24 is provided through the middle of the droplet head body 23, and a plurality of auxiliary flow channels 25 are communicated with the main flow channel 24. The first end of the auxiliary flow channel 25 is communicated to the upper part of the main flow channel 24, and the second end is communicated to the lower part of the main flow channel 24. An installation portion 26 is formed between the auxiliary flow channel 25 and the main flow channel 24 in the droplet head body 23; a plug 27 slidably assembled in the main flow channel 24, and the plug 27 is used to block or open the first end of the auxiliary flow channel 25; and an elastic pressing member 28 with one end abutted against the installation portion 26 and the other end abutted against the bottom of the plug 27. In the natural state, the elastic pressing member 28 drives the plug 27 to block the first end of the auxiliary flow channel 25.

[0096] Specifically, at least two symmetric auxiliary flow channels 25 are provided, and during the movement of the plug 27, it can always maintain a sliding contact state with the inside of the upper part of the main flow channel 24. An installation groove is formed in the installation portion 26. A limiting block 29 extending into the installation groove is provided at the bottom of the plug 27. The elastic pressing member 28 is embedded in the installation groove, and the limiting block 29 can abut against the top wall of the installation groove to limit the blocking position of the plug 27. One end of the elastic pressing member 28 is fixed to the installation portion 26, and the other end is fixed to the limiting block 29. While realizing the elastic reset of the plug 27, it also realizes the support for the plug 27. The upward movement position of the plug 27 can be limited by the limiting block 29 to ensure the accuracy of the blocking position, and the downward movement position of the plug 27 can be determined by the deformation amount of the elastic pressing member 28, and the limit position is when the elastic pressing member 28 is completely compressed.

[0097] When not sampling, the plug 27 maintains the state of blocking the first end of the auxiliary flow channel 25 under the action of the elastic pressing member 28. When the flexible deformation portion 12 is compressed for sampling, the liquid sample to be measured in the liquid storage tank 10 is pressurized, and the water pressure acts on the plug 27 to make the plug 27 move downward, opening the first end of the auxiliary flow channel 25. The corresponding liquid sample to be measured can then flow out from the auxiliary flow channel 25, and finally converge into the main flow channel 24 and be discharged from the droplet head body 23 to complete the sampling process; after flowing out a corresponding volume of the liquid sample to be measured, the water pressure will recover, and the plug 27 can move upward again under the action of the elastic force of the elastic pressing member 28 to close the first end of the auxiliary flow channel 25, realizing the self-sealing of the liquid outlet droplet head 20.

[0098] Embodiment Five

[0099] The difference between this embodiment and other embodiments is that as Figure 8As shown, in this embodiment, a conduit 113 is provided at the bottom of the rigid mounting portion 11. The liquid discharge droplet head 20 is connected to the conduit 113, and a micro-control valve 114 is connected to the conduit 113. The micro-control valve 114 can also be an electromagnetic valve. During sampling, the micro-control valve 114 is opened, and the sample liquid to be measured can be discharged from the liquid discharge droplet head 20. During liquid injection, the micro-control valve 114 is closed, and the self-sealing state of the liquid discharge droplet head 20 can be achieved.

[0100] The above embodiments only illustrate several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can be made. These are all equivalent modifications and evolutions made to the above embodiments based on the substantial technology of the present utility model, and all of these fall within the protection scope of the present utility model.

Claims

1. A continuous micro-sampling device for water quality detection, characterized in that, include: A liquid storage tank having a hard mounting portion and a flexible deformation portion, wherein a self-sealing liquid dripping head is provided at the bottom of the liquid storage tank; A liquid adding device connected to the hard mounting portion to inject the sample liquid to be tested into the liquid storage tank; A servo liquid discharge mechanism is used to apply pressure to the flexible deformation part to cause the flexible deformation part to deform to control the change in the internal volume of the liquid storage tank, so as to discharge a corresponding volume of the sample liquid to be tested from the liquid discharge dropper to achieve sampling.

2. The continuous micro-sampling device for water quality detection according to claim 1, characterized in that, The flexible deformation part is sealedly connected to the hard installation part through a deformation wall which can realize overall expansion and contraction change according to a predetermined rule.

3. The continuous micro-sampling device for water quality detection according to claim 2, wherein The deformable wall is in a sawtooth shape and / or a corrugated shape and can be retracted and folded. The predetermined rule is that the internal volume of the deformable wall changes linearly when the deformable wall changes in telescopic manner.

4. The continuous micro-sampling device for water quality detection according to claim 3, wherein, The inner side of the deformable wall is sealed with a flexible sealing film, and in the initial state of the flexible deformable portion, the flexible sealing film is in a stretched state.

5. The continuous micro-sampling device for water quality detection according to any one of claims 1-4, characterized in that, A push plate is provided on the outer side of the flexible deformation portion, and the push plate is used to be connected with the servo liquid outlet mechanism.

6. The continuous micro-sampling device for water quality detection according to claim 5, characterized in that, The servo liquid outlet mechanism is selected from the following structures, either alone or in combination: a cam mechanism, a connecting rod mechanism, a gear rack mechanism or a servo screw mechanism; The power output end of the servo fluid outlet mechanism is connected to the push plate to drive the flexible deformation portion to be compressed inwardly or stretched outwardly.

7. The continuous micro-sampling device for water quality detection according to claim 1, wherein An airbag is provided inside the rigid mounting portion, an air filling port of the airbag extends out of the rigid mounting portion and is connected to an air filling device, and the airbag is used to adjust the volume in the liquid storage tank so that the sample liquid to be tested is kept full in the liquid storage tank.

8. The continuous micro-sampling device for water quality detection according to claim 1, characterized in that, The top of the hard mounting portion is provided with a liquid injection port, and the liquid adding device comprises: An injection tube, one end of which is connected to the injection port and the other end of which is connected to an infusion pump, wherein the infusion pump is arranged in a liquid storage tank of the sample liquid to be tested; The liquid supply valve is connected between the liquid injection port and the liquid injection pipe and is used to control the on-off of the liquid injection pipe.

9. The continuous micro-sampling device for water quality detection according to claim 1, wherein The top of the rigid mounting portion is provided with a liquid injection port, the liquid injection port is provided with a sealing joint, and the liquid adding device comprises: A liquid adding head, the liquid adding head is connected to an infusion pump through an infusion hose, and the infusion pump is arranged in a liquid storage tank of the sample liquid to be tested; A servo moving mechanism, used for driving the liquid adding head to move along the horizontal plane and the vertical plane; When adding liquid, the servo moving mechanism drives the liquid adding head to move to just above the liquid filling port, and inserts it into the sealing joint to open the sealing joint to inject liquid into the liquid storage tank; when the servo moving mechanism drives the liquid adding head to detach from the sealing joint, the sealing joint is in a self-sealing state.

10. The continuous micro-sampling device for water quality detection according to claim 9, characterized in that, The sealing joint comprises: A joint body connected to the liquid injection port, wherein the upper end of the joint body is provided with an inwardly recessed sealing section; A movable guide ring fixed in the joint body, wherein a guide hole is provided in the middle of the movable guide ring, and a plurality of water holes are provided around the guide hole; A sealing plug is slidably mounted on the guide hole through a guide post, the sealing plug can be sealed with the sealing section, and the sealing head opens when the sealing section is pushed away from the sealing section by the liquid adding head; and An elastic reset member sleeved on the guide post, one end of the elastic reset member abuts against the movable guide ring, and the other end abuts against the bottom of the sealing plug. When the elastic reset member is in a natural state, it abuts against the sealing plug to be sealingly connected to the sealing section to form a self-sealing state.

11. The continuous micro-sampling device for water quality detection according to claim 5, characterized in that, A liquid outlet corresponding to the liquid outlet nozzle is provided at the bottom of the rigid mounting portion. A connecting rod connected to the push plate is provided in the liquid storage tank. A sealing plate is provided at the end of the connecting rod. In the initial state of the flexible deformation portion, the sealing plate blocks the liquid outlet.

12. The continuous micro-sampling device for water quality detection according to claim 11, wherein, The liquid outlet is provided in a long strip shape, an oval shape or an oblong shape parallel to the push plate.

13. The continuous micro-sampling device for water quality detection according to claim 5, wherein The liquid outlet nozzle includes: A nozzle body fixed to the bottom of the rigid mounting portion. A main flow channel is provided through the middle of the nozzle body. The main flow channel is communicated with a plurality of auxiliary flow channels. The first end of the auxiliary flow channel is communicated with the upper part of the main flow channel, and the second end is communicated with the lower part of the main flow channel. An installation portion is formed between the auxiliary flow channel and the main flow channel in the nozzle body. A plug slidably assembled in the main flow channel, and the plug is used to block or open the first end of the auxiliary flow channel; and, An elastic pressing member with one end abutting against the installation portion and the other end abutting against the bottom of the plug. In a natural state, the elastic pressing member drives the plug to block the first end of the auxiliary flow channel.

14. The continuous micro-sampling device for water quality detection according to claim 13, wherein An installation groove is formed in the installation portion. A limiting block extending into the installation groove is provided at the bottom of the plug. The elastic pressing member is embedded in the installation groove, and the limiting block can abut against the top wall of the installation groove to limit the plugging position of the plug.

15. The continuous micro-sampling device for water quality detection according to claim 5, wherein A conduit is provided at the bottom of the rigid mounting portion. The liquid outlet nozzle is connected to the conduit, and a micro control valve is connected to the conduit.

16. The continuous micro-sampling device for water quality detection according to any one of claims 7-10, characterized in that, A water immersion sensor is provided on the top of the rigid mounting portion for detecting the liquid level in the liquid storage tank.

17. The continuous micro-sampling device for water quality detection according to any one of claims 7-10, characterized in that A water pressure sensor is provided at the liquid outlet nozzle. When the water pressure sensor detects that the water pressure value reaches a predetermined threshold, a full water signal is generated.

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