Microfluidic detector and detection method

Abstract

A micro-flow detector and a detection method thereof belong to the field of fluid detection technology. The present invention includes an outer shell, a sensor and a micro-flow valve body. A micro-flow valve body is installed in the outer shell. The micro-flow valve body includes a valve body shell, a liquid pipe joint, a spring and a valve core group. A loop connected end to end is processed inside the valve body shell. The two diagonals of the loop are respectively processed with a left port and a right port connected to the outside world. The left port and the right port are respectively installed with liquid pipe joints. One end of the liquid pipe joint is connected to the valve core group through a spring inside the loop. The other end of the liquid pipe joint is set through the outer shell. Except for the two diagonals of the loop connected to the outside world, sensors are installed on the outer side walls of the valve body shell corresponding to the other two diagonals. The present invention can realize the detection of bidirectional flow in the same pipeline. The detector is suitable for detecting the flow of fluids. At the same time, it has a very sensitive response to trace leakage and can effectively test the leakage inside the system.

Description

Technical Field

[0001] The invention relates to a micro-flow detector and a detection method thereof, belonging to the technical field of fluid detection. Background Art

[0002] Since the hydraulic system is closed and opaque, it is difficult to observe the internal operation of the system, so it is very difficult to understand the operating status of the hydraulic system and analyze faults in practice. There are many devices on the market that can test fluid flow, such as target-type and piston-type flow switches, which can detect the flow of fluids.

[0003] Target (baffle) flowmeters are used to detect unidirectional or bidirectional flow of air, oil, water and other media. When the fluid flows through the pipeline, the baffle deflects, causing the single-pole double-throw micro switch to operate at the set flow rate and output a switch signal; during bidirectional detection, the baffle deflects and pushes the magnetic module upward, driving the switch module to operate.

[0004] The disadvantage is that it is not sensitive to small flow detection. Since the flow is small, the force on the sensor is small. At this time, the energy consumed by the detection element in the flow detector cannot be ignored. Although some instruments can be adjusted to small signal alarms on site, the effect is not reliable. For small flow, it must be able to adapt in principle. The small signal alarm is a set result, not a manual adjustment.

[0005] Piston flow switch, such as: CN208466183U, a piston flow induction switch with a built-in piston that drives the piston to move according to the change of flow rate. The permanent magnet in the piston cooperates with the reed switch to give a switch signal, and the piston is reset by the spring force;

[0006] The disadvantages are: it is sensitive to micro-flow, but cannot determine the flow direction of the fluid in a closed fluid pipeline. The switch is directional and cannot detect bidirectional flow in the same pipeline, which limits its application occasions.

[0007] Therefore, it is urgent to propose a new type of microfluidic detector to solve the above technical problems. Summary of the invention

[0008] The purpose of the present invention is to solve the problem that the existing fluid detection device cannot realize the detection of bidirectional flow in the same pipeline. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0009] The technical solution of the present invention:

[0010] The micro-fluidic detector comprises an outer shell, a sensor and a micro-fluidic valve body. The micro-fluidic valve body is installed in the outer shell. The micro-fluidic valve body comprises a valve body shell, a liquid pipe joint, a spring and a valve core group. A loop connected end to end is processed inside the valve body shell. The two diagonals of the loop are respectively processed with a left port and a right port connected to the outside world. The left port and the right port are respectively installed with liquid pipe joints. One end of the liquid pipe joint is connected to the valve core group through a spring inside the loop, and the other end of the liquid pipe joint is arranged through the outer shell. Except for the two diagonals of the loop connected to the outside world, sensors are installed on the outer side walls of the valve body shell corresponding to the other two diagonals.

[0011] Preferably, the loop is a rectangular loop, and the inner walls of the top transverse pipeline and the bottom transverse pipeline of the rectangular loop are both installed with valve core groups in sliding contact.

[0012] Preferably: a permanent magnet is arranged in the valve core assembly.

[0013] The micro-flow detection method is implemented based on a micro-flow detector, which is installed on the pipeline where the fluid to be detected flows. Specifically:

[0014] Initial position: When the fluid to be detected in the pipeline does not flow, the valve core groups on the left and right sides of the micro-flow valve body are in the initial position under the thrust of the spring, the permanent magnet is away from the reed switch sensor in the permanent magnet body, and the control panel does not work;

[0015] Monitoring of the flow of the fluid to be tested from left to right: When the fluid to be tested in the pipeline flows from left to right, after the fluid flows into the circuit from the left port of the micro-flow valve body, the fluid to be tested pushes the right valve core group to move to the right, and the fluid to be tested passes through the guide end of the right valve core group and flows out from the right port of the micro-flow valve body. At this time, the left valve core group does not move at the initial position, and the right permanent magnet moves to the right with the right valve core group and approaches the right reed switch sensor. Under the magnetic control of the permanent magnet, the right reed switch sensor is attracted, the control panel starts to work, and the right forward indicator light on the control panel lights up;

[0016] Monitoring of the flow of the fluid to be tested from right to left: When the fluid to be tested in the pipeline flows from right to left, after the fluid flows into the circuit from the right port of the micro-flow valve body, the fluid to be tested pushes the left valve core group to move to the left, and the fluid to be tested passes through the guide end of the left valve core group and flows out from the left port of the micro-flow valve body. At this time, the right valve core group does not move at the initial position, and the left permanent magnet moves to the left with the left valve core group and approaches the left reed switch sensor. Under the magnetic control of the permanent magnet, the reed switch sensor on the left is attracted, the control panel starts to work, and the left reverse indicator light on the control panel lights up.

[0017] In order to solve the problem that the valve core group can move left and right according to the fluid pressure, the present invention proposes the following technical solution:

[0018] Preferably: the valve core group includes a sealing end and a guide end fixedly connected to the left and right sides;

[0019] The outer wall of the guide end is processed with a guide protrusion, and a liquid flow groove is formed between the guide protrusion and the outer wall of the guide end. The liquid flow groove is a wedge-shaped structure, and the liquid flow groove is divided into long grooves and short grooves that are staggered.

[0020] Preferably, the number of the guide protrusions is at least four, and they are equidistantly arranged circumferentially on the outer wall of the guide end.

[0021] Preferably: a permanent magnet is installed in the sealing end, and both ends of the spring are connected to the sealing end and the liquid pipe joint respectively;

[0022] The spring is connected to the liquid pipe joint via a spring seat.

[0023] Preferably, the liquid pipe joint is installed inside the outer shell through a fixing clip.

[0024] In order to timely display the flow direction of fluid, the technical solution of the present invention is as follows:

[0025] Preferably: it also includes a control panel and a battery, the sensor includes a sensor junction box and a reed switch sensor, the reed switch sensor is installed in the sensor junction box, the reed switch sensor is electrically connected to the control panel, the battery is installed in the outer shell through the battery box, and the battery is electrically connected to the control panel.

[0026] In order to be applicable to fluids with different compositions and flow rates, the present invention can adjust the sensitivity of the sensor, and its technical solution is as follows:

[0027] Preferably, a waist-shaped hole is processed on the sensor junction box, an adjusting bolt is arranged in the waist-shaped hole, and the sensor junction box is installed on the top of the valve body shell through the adjusting bolt.

[0028] The present invention has the following beneficial effects:

[0029] 1. The micro-flow detector of the present invention can detect the flow of fluid in the system, and is particularly sensitive to weak flow reflections;

[0030] 2. The micro-flow detector of the present invention can realize the detection of bidirectional flow in the same pipeline. The detector is suitable for detecting the flow of fluids and is very sensitive to trace leakage, and can effectively test the leakage inside the system;

[0031] 3. The micro-flow detector of the present invention is a micro-flow test instrument that can effectively monitor the hydraulic system, and can simultaneously complete the functions of detecting the oil flow inside the system, monitoring the system operation, and analyzing the system internal leakage fault;

[0032] 4. The micro-flow detector of the present invention is a detection device that uses magnetic induction triggering. The valve body is made of stainless steel. The internal fluid does not contact the external electronic detection device and will not corrode the detection element. The fluid working chamber is closed and can withstand higher pressures. It is suitable for a wide range of pressures. When in use, the detector can be connected in series to the system pipeline with a special high-pressure hose and can be used normally.

[0033] 5. The micro-flow detector of the present invention is suitable for fluids with different compositions and flow rates, and the sensitivity of the sensor can be adjusted through the waist-shaped hole;

[0034] 6. The micro-flow detector of the present invention can also be used in occasions where equipment such as liquid level monitoring is used, such as: water circulation control, water inlet and outlet control, water heating control, water pump switch control, solenoid valve on-off control or water outlet power-off and power-on control of wet grinders, humidifiers, electric water heaters, solar water heaters, air conditioners and other water systems, as well as internal leakage detection of hydraulic systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a stereogram of a microfluidic detector;

[0036] Figure 2 is a structural diagram of a microfluidic detector;

[0037] Figure 3 yes Figure 2 A top view of

[0038] Figure 4 It is a structural schematic diagram of the battery box of the present invention;

[0039] Figure 5 is a three-dimensional diagram of the valve core assembly of the present invention;

[0040] Figure 6 It is a structural diagram of the valve core assembly of the present invention;

[0041] Figure 7 is a state diagram of the microfluidic valve body in step 1 of the second specific implementation mode;

[0042] Figure 8 is a state diagram of the microfluidic valve body in step 2 of the second specific implementation mode;

[0043] Fig. 9 yes Figure 8 AA section view;

[0044] Fig.10 is a state diagram of the microfluidic valve body in step 3 of the second specific implementation mode;

[0045] Fig.11 yes Fig.10 BB cross-section diagram;

[0046] Fig.12 is a three-dimensional view of the valve body housing of the present invention;

[0047] Fig.13 It is a structural diagram of the valve body housing of the present invention;

[0048] Fig.14 is a three-dimensional diagram of the spring seat of the present invention;

[0049] Fig.15 is a three-dimensional diagram of a sensor junction box of the present invention;

[0050] Fig.16 is a structural diagram of the control panel of the present invention;

[0051] Fig.17 is a circuit diagram of a control panel of the present invention;

[0052] In the figure, 1-valve body shell, 2-liquid pipe joint, 3-spring, 4-valve core group, 5-permanent magnet, 6-outer shell, 7-sensor, 8-micro-flow valve body, 9-fixing clamp, 10-control panel, 11-loop, 111-left side port, 112-right side port, 11-1-top horizontal pipeline, 11-2-bottom horizontal pipeline, 31-spring seat, 41-sealing end, 42-guide end, 421-guide protrusion, 422-liquid flow groove, 61-battery box, 71-sensor junction box, 72-reed switch sensor, 711-waist-shaped hole, 712-adjusting bolt. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0054] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: a fixed connection is selected as a welding connection, and a detachable connection is selected as a hinge connection.

[0055] Specific implementation method 1: Combination Figure 1-Figure 17The present embodiment is described. The microfluidic detector of the present embodiment comprises an outer shell 6, a sensor 7 and a microfluidic valve body 8. The microfluidic valve body 8 is installed in the outer shell 6. The microfluidic valve body 8 comprises a valve body shell 1, a liquid pipe joint 2, a spring 3 and a valve core group 4. A loop 11 connected end to end is processed inside the valve body shell 1. The two diagonals of the loop 11 are respectively processed with a left port 111 and a right port 112 connected to the outside world. The left port 111 and the right port 112 are respectively installed with a liquid pipe joint 2. One end of the liquid pipe joint 2 is connected to the valve core group 4 through the spring 3 inside the loop 11, and the other end of the liquid pipe joint 2 is arranged through the outer shell 6. Except for the two diagonals of the loop 11 connected to the outside world, the outer side walls of the valve body shell 1 corresponding to the other two diagonals are installed with sensors 7. The number of liquid pipe joints 2, springs 3 and valve core groups 4 is two, distributed on the left and right sides of the microfluidic valve body 8. The valve body shell 1 is rectangular. In order to prevent the two sensors 7 from conflicting and facilitate independent adjustment, the two sensors 7 are separately installed on the valve body shell 1.

[0056] The loop 11 is a rectangular loop, and the inner walls of the top transverse pipeline 11-1 and the bottom transverse pipeline 11-2 of the rectangular loop are both installed with valve core groups 4 in sliding contact. When processing the loop 11, through holes are processed on the four side walls of the valve body shell 1. The through holes on the left and right sides of the valve body shell 1 are the left port 111 and the right port 112, which are used for fluid circulation. The through holes on the front and rear sides of the valve body shell 1 are processing holes and need to be sealed with wire plugs.

[0057] The valve core assembly 4 is provided with a permanent magnet 5 for generating a magnetic on-off reaction with the sensor 7 .

[0058] The valve core group 4 includes a sealing end 41 and a guide end 42 fixedly connected on the left and right sides. The sealing end 41 plays a sealing role. The end surface of the sealing end 41 is processed with a mounting groove, the permanent magnet 5 is placed at the bottom of the mounting groove, and the spring seat 31 of the spring 3 is arranged at the top of the mounting groove.

[0059] The outer wall of the guide end 42 is processed with a guide protrusion 421, and a flow groove 422 is formed between the guide protrusion 421 and the outer wall of the guide end 42. The flow groove 422 is a wedge-shaped structure. The flow groove 422 is processed by arc surface cutting to meet the processing conditions, and the flow groove 422 is divided into long grooves and short grooves that are staggered. The long groove is close to the end face of the sealing end, and the flow groove 422 is a wedge-shaped design with alternating long and short lengths, so that the movement of the valve core group 4 has a linear relationship with the flow rate; the purpose of setting the long groove close to the end face of the sealing end is to reduce the sealing distance, so that the valve core group 4 can be reset in time when it is not working.

[0060] The wedge-shaped structure of the flow groove mainly plays a role in a gradual opening process, which can prevent the valve core group 4 from impacting; more importantly, it can realize a linear relationship between the opening size and the flow rate.

[0061] The number of the guide protrusions 421 is an even number, and there are at least four of them, which are arranged equidistantly on the outer wall of the guide end 42. The guide end 42 is cross-shaped or M-shaped, etc. When the sealing end 41 leaves the sealing surface, the valve body is connected, and the guide end plays the role of guide and channel. The sealing surface is the middle inner wall of the top transverse pipeline 11-1 and the bottom transverse pipeline 11-2.

[0062] A permanent magnet 5 is installed in the sealing end 41, and both ends of the spring 3 are connected to the sealing end 41 and the liquid pipe joint 2 respectively;

[0063] The spring 3 is connected to the liquid pipe joint 2 via a spring seat 31. The outer side of the spring seat 3 is processed with a thread, and is connected to the inner shoulder of the valve body 3 after being tightened.

[0064] The liquid pipe joint 2 is installed inside the outer shell 6 via a fixing clamp 9 .

[0065] It also includes a control panel 10 and a battery. The control panel is provided with a switch, a power detection light, a reflux indicator light, and a forward indicator light. The sensor 7 includes a sensor junction box 71 and a reed switch sensor 72. The reed switch sensor 72 is installed in the sensor junction box 71. The reed switch sensor 72 is electrically connected to the control panel 10. The battery is installed in the outer shell 6 through the battery box 61, and the battery is electrically connected to the control panel.

[0066] The sensor junction box 71 is processed with a waist-shaped hole 711, and an adjustment bolt 712 is arranged in the waist-shaped hole 711. The sensor junction box 71 is installed on the top of the valve body shell 1 through the adjustment bolt 712. The waist-shaped hole 711 can enable the sensor junction box 71 to move laterally, which is suitable for fluids with different components and flow rates. The sensitivity of the sensor can be adjusted through the waist-shaped hole to achieve the purpose of detecting whether there is liquid flow or detecting whether the minimum flow rate has been reached.

[0067] The working principle of magnetic induction is as follows Fig.17 As shown, two reed switch sensors 72 are installed in two sensor junction boxes 71 respectively. The reed switch sensors 72 are installed on the valve body housing 1. When there is no fluid flowing in the valve body housing 1, the reed switch sensor 72 should be in a disconnected state, indicating that the circuit is not conductive. When the fluid flows in the valve body housing 1, or the flow rate reaches the set requirement, the valve core group 4 is pushed to move, and the permanent magnet 5 installed in the valve core group 4 is close to the reed switch sensor 72, which will trigger the reed inside to close, and the reed switch sensor 72 is turned on, the circuit is conductive, and the indicator light is on.

[0068] Specific implementation method 2: Combination Figure 1-Figure 17 This embodiment is described based on the specific embodiment 1. In the micro-flow detection method of this embodiment, the micro-flow detector is installed on the pipeline where the fluid to be detected flows, specifically:

[0069] Step 1, initial position: Figure 7 As shown, when the fluid to be detected in the pipeline does not flow, the valve core groups 4 on the left and right sides of the micro-flow valve body 8 are in the initial position under the thrust of the spring 3, the permanent magnet 5 is away from the reed switch sensor 72 in the permanent magnet 5, and the control panel 10 does not work;

[0070] Step 2: Monitoring of the flow of the fluid to be tested from left to right: Figure 8 and 9 As shown, when the fluid to be detected in the pipeline flows from left to right, after the fluid flows into the circuit 11 from the left port 111 of the micro-flow valve body 8, the fluid to be detected pushes the right valve core group 4 to move to the right, and the fluid to be detected passes through the guide end 42 of the right valve core group 4 and flows out from the right port 112 of the micro-flow valve body 8. At this time, the left valve core group 4 is stationary at the initial position, and the right permanent magnet 5 moves rightward with the right valve core group 4 to approach the right reed switch sensor 72. Under the magnetic control of the permanent magnet 5, the right reed switch sensor 72 is attracted, and the control panel 10 starts to work, and the right forward indicator light on the control panel 10 lights up;

[0071] Step 3: Monitoring of the flow of the fluid to be tested from right to left: Fig.10 and 11 As shown, when the fluid to be detected in the pipeline flows from right to left, the monitoring of the flow of the fluid to be detected from right to left: when the fluid to be detected in the pipeline flows from right to left, after the fluid flows into the circuit 11 from the right side port 112 of the micro-flow valve body 8, the fluid to be detected pushes the left valve core group 4 to move to the left, and the fluid to be detected flows out from the left side port 111 of the micro-flow valve body 8 after passing through the guide end 42 of the left valve core group 4. At this time, the right valve core group 4 is stationary at the initial position, and the left permanent magnet 5 moves to the left with the left valve core group 4 and approaches the left reed switch sensor 72. Under the magnetic control of the permanent magnet 5, the reed switch sensor 72 on the left is attracted, and the control panel 10 starts to work, and the left reverse indicator light on the control panel 10 is on.

[0072] Specific implementation method three: Combination Figure 1-Figure 17 This embodiment is described based on the specific embodiment 1. In the micro-flow detection method of this embodiment, the micro-flow detector is installed on the pipeline where the fluid to be detected flows. The flow scale is drawn on the micro-flow valve body 8 close to the sensor 7. The installation position of the sensor 7 can be adjusted according to the scale on the micro-flow valve body 8 to detect the micro-flow or the quantitative flow, so as to obtain the detection result more intuitively, that is, the minimum switching amount can be set by moving the sensor according to the scale. When the flow reaches the set value, the valve core opening can trigger the sensor, specifically:

[0073] Initial position: when the fluid to be detected in the pipeline does not flow, the valve core groups 4 on the left and right sides of the micro-flow valve body 8 are in the initial position under the thrust of the spring 3, the permanent magnet 5 is away from the reed switch sensor 72 in the permanent magnet 5, and the control panel 10 does not work;

[0074] Monitoring of the flow of the fluid to be detected from left to right: When the fluid to be detected in the pipeline flows from left to right, after the fluid flows into the inlet circuit 11 from the left port 111 of the micro-flow valve body 8, the fluid to be detected pushes the right valve core group 4 to move to the right, and the fluid to be detected passes through the guide end 42 of the right valve core group 4 and flows out from the right port 112 of the micro-flow valve body 8. At this time, the left valve core group 4 is stationary at the initial position. When the fluid reaches the set flow rate, the position of the reed switch sensor 72 corresponds to the scale line representing different flow rates. The right permanent magnet 5 moves to the right with the right valve core group 4 and approaches the right reed switch sensor 72. Under the magnetic control of the permanent magnet 5, the right reed switch sensor 72 is attracted, and the control panel 10 starts to work. The right forward indicator light on the control panel 10 lights up, indicating that the flow has reached the set flow value;

[0075] Monitoring of the flow of the fluid to be detected from right to left: When the fluid to be detected in the pipeline flows from right to left, after the fluid flows into the circuit 11 from the right side port 112 of the micro-flow valve body 8, the fluid to be detected pushes the left valve core group 4 to move to the left, and the fluid to be detected passes through the guide end 42 of the left valve core group 4 and flows out from the left side port 112 of the micro-flow valve body 8. At this time, the right valve core group 4 is stationary at the initial position. When the fluid reaches the set flow rate, the position of the reed switch sensor 72 corresponds to the scale line representing different flow rates, and the left permanent magnet 5 moves to the left with the left valve core group 4 and approaches the left reed switch sensor 72. Under the magnetic control of the permanent magnet 5, the reed switch sensor 72 on the left is attracted, and the control panel 10 starts to work, and the left reverse indicator light on the control panel 10 lights up.

[0076] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0077] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0078] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0079] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0080] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0081] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0082] 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. A microfluidic detector, characterized in that: The invention comprises an outer shell (6), a sensor (7) and a microfluidic valve body (8). The outer shell (6) is provided with a microfluidic valve body (8). The microfluidic valve body (8) comprises a valve body shell (1), a liquid pipe joint (2), a spring (3) and a valve core group (4). A loop (11) connected end to end is processed inside the valve body shell (1). A left port (111) and a right port (112) are processed at two diagonal positions of the loop (11) for communicating with the outside world. The left port (111) and the right port (112) are respectively provided with liquid pipe joints (2). One end of the liquid pipe joint (2) is connected to the valve core group (4) inside the loop (11) through the spring (3). The other end of the liquid pipe joint (2) is arranged to penetrate the outer shell (6). Except for the two diagonal positions of the loop (11) for communicating with the outside world, the outer side walls of the valve body shell (1) corresponding to the other two diagonal positions are provided with sensors (7). The valve core assembly (4) comprises a sealing end (41) and a guide end (42) which are fixedly connected to each other on the left and right sides; The outer wall of the guide end (42) is processed with a guide protrusion (421), and a liquid flow groove (422) is formed between the guide protrusion (421) and the outer wall of the guide end (42). The liquid flow groove (422) is a wedge-shaped structure, and the liquid flow groove (422) is divided into long grooves and short grooves that are alternately distributed; A permanent magnet (5) is installed in the sealing end (41), and two ends of the spring (3) are respectively connected to the sealing end (41) and the liquid pipe joint (2); the spring (3) is connected to the liquid pipe joint (2) via a spring seat (31); It also includes a control panel (10) and a battery. The sensor (7) includes a sensor junction box (71) and a reed switch sensor (72). The reed switch sensor (72) is installed in the sensor junction box (71). The reed switch sensor (72) is electrically connected to the control panel (10). The battery is installed in the outer shell (6) through a battery box (61). The battery is electrically connected to the control panel.

2. The microfluidic detector according to claim 1, characterized in that: The circuit (11) is a rectangular circuit, and the inner walls of the top transverse pipeline (11-1) and the bottom transverse pipeline (11-2) of the rectangular circuit are both installed with valve core groups (4) in sliding contact.

3. The microfluidic detector according to claim 2, characterized in that: A permanent magnet (5) is arranged in the valve core group (4).

4. The microfluidic detector according to claim 3, characterized in that: The number of the guide protrusions (421) is an even number, and is at least four, and is equidistantly arranged on the outer wall of the guide end (42) in a circumferential manner.

5. The microfluidic detector according to claim 4, characterized in that: The liquid pipe joint (2) is installed inside the outer shell (6) via a fixing clamp (9).

6. The microfluidic detector according to claim 5, characterized in that: The sensor junction box (71) is processed with a waist-shaped hole (711), an adjustment bolt (712) is arranged in the waist-shaped hole (711), and the sensor junction box (71) is installed on the top of the valve body shell (1) through the adjustment bolt (712).

7. A micro-flow detection method is implemented based on the micro-flow detector according to claim 6, wherein the micro-flow detector is installed on a pipeline where the fluid to be detected flows, and is characterized in that: Initial position: when the fluid to be detected in the pipeline does not flow, the valve core groups (4) on the left and right sides of the microfluidic valve body (8) are in the initial position under the thrust of the spring (3), the permanent magnet (5) is away from the reed switch sensor (72) in the permanent magnet (5), and the control panel (10) does not work; Monitoring of the flow of the fluid to be detected from left to right: when the fluid to be detected in the pipeline flows from left to right, after the fluid flows into the inlet circuit (11) from the left port (111) of the micro-flow valve body (8), the fluid to be detected pushes the right valve core group (4) to move to the right, and after the fluid to be detected passes through the guide end (42) of the right valve core group (4), it flows out from the right port (112) of the micro-flow valve body (8); at this time, the left valve core group (4) remains stationary at the initial position, and the right permanent magnet (5) moves rightward with the right valve core group (4) to approach the right reed switch sensor (72), and the reed switch sensor (72) is attracted by the magnetic control of the permanent magnet (5), the control panel (10) starts to work, and the right forward indicator light on the control panel (10) lights up; Monitoring of the flow of the fluid to be detected from right to left: when the fluid to be detected in the pipeline flows from right to left, after the fluid flows into the circuit (11) from the right side port (112) of the micro-fluidic valve body (8), the fluid to be detected pushes the left side valve core group (4) to move to the left side, and after the fluid to be detected passes through the guide end (42) of the left side valve core group (4), it flows out from the left side port (111) of the micro-fluidic valve body (8); at this time, the right side valve core group (4) remains stationary at the initial position, and the left side permanent magnet (5) moves to the left along with the left side valve core group (4) to approach the left side reed switch sensor (72), and the reed switch sensor (72) on the left side is attracted under the magnetic control of the permanent magnet (5), and the control panel (10) starts to work, and the left side reverse indicator light on the control panel (10) lights up.

Images