Liquid leakage detection circuit and device and sample analyzer

Abstract

The utility model discloses a liquid leakage detection circuit, a liquid leakage detection device and a sample analyzer. The circuit comprises a control circuit, a switching circuit, a liquid leakage sensor, a signal conditioning circuit and a detection judgment circuit, the control circuit is connected with the switching circuit, the switching circuit is connected with the liquid leakage sensor, the liquid leakage sensor is connected with the signal conditioning circuit, the signal conditioning circuit is connected with the detection and judgment circuit, and the detection and judgment circuit is connected with the control circuit. The control circuit is used for controlling the working state of the switching circuit and transmitting an excitation signal or a driving signal to the switching circuit; the excitation signal or the driving signal is transmitted to the liquid leakage sensor through the switching circuit; an output signal of the liquid leakage sensor is processed through the signal conditioning circuit and the detection and judgment circuit, and then an in-situ detection result or a liquid leakage detection result is obtained. According to the utility model, the excitation signal or the driving signal is transmitted to the liquid leakage sensor through the switching circuit, and the in-place detection and liquid leakage detection functions of the sensor can be realized under the condition of not increasing wires.

Description

TECHNICAL FIELD

[0001] The utility model relates to a liquid leakage detection technical field, specifically relates to a liquid leakage detection circuit, device and sample analyzer. BACKGROUND

[0002] The sample analyzer is a device for processing and analyzing biological samples, and provides reliable data support for relevant workers. If the sample analyzer has a liquid leakage phenomenon, the liquid leakage phenomenon will not only affect the analysis result, but also cause damage to the instrument, so it is very important to check the liquid leakage problem of the sample analyzer in time. At present, pressure detection sensors are usually arranged at some channels with high pressure and easy blockage, and the user is warned when the pressure is abnormal, so as to achieve the purpose of preventing pipe collapse and liquid leakage. However, in some non-sealed occasions such as blood cell counting pool, it is impossible to monitor whether the liquid in the pool is normally discharged through pressure detection, once the liquid in the pool overflows, the instrument will be contaminated, and the overflowed liquid also has the risk of damaging electrical components. The pressure detection sensor cannot adapt to all application occasions and is limited by the application occasion, and it may be necessary to prevent and monitor liquid leakage at multiple positions in the instrument, the use of pressure detection sensor is high in cost, and the pressure detection sensor fails in some occasions with high pH value.

[0003] In addition, for some leakage problems caused by assembly shortage, pipeline joint aging and pump valve control failure, liquid leakage detection is also needed to better improve the prevention and alarm mechanism, and most of the instruments do not have liquid leakage detection device. Part of the instrument is equipped with liquid leakage sensor, which realizes detection by forming a loop with the leaked liquid, so the in-situ detection of the liquid leakage sensor is also a key link, however, the current detection method is to check the in-situ situation of the liquid leakage sensor manually, which increases the labor cost and is not easy to be detected by the user, and manual inspection may be missed; another detection method is to identify by increasing additional detection lines, which increases the cost of wire and has the risk of loosening. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of liquid leakage detection circuit, device and sample analyzer, to solve the problem of high liquid leakage detection cost in prior art and the in-situ situation of detection sensor is prone to manual inspection omission or increase wire.

[0005] The utility model provides a kind of liquid leakage detection circuit, comprising: control circuit, switching circuit, liquid leakage sensor, signal conditioning circuit and detection determination circuit;The control circuit is connected with the switching circuit, the switching circuit is connected with the liquid leakage sensor, the liquid leakage sensor is connected with the signal conditioning circuit, the signal conditioning circuit is connected with the detection determination circuit, and the detection determination circuit is connected with the control circuit;Wherein, the control circuit is used to control the working state of the switching circuit, and excitation signal or driving signal is transmitted to the switching circuit;The switching circuit is used to transmit the excitation signal or the driving signal to the liquid leakage sensor according to the working state;The signal conditioning circuit is used to process the first output signal generated when the liquid leakage sensor accesses the excitation signal to obtain first detection signal;Or for processing the second output signal generated when the liquid leakage sensor accesses the driving signal to obtain second detection signal;The detection determination circuit is used to output in-place detection result to the control circuit according to the first detection signal;Or for outputting liquid leakage detection result to the control circuit according to the second detection signal.

[0006] In a technical solution, the control circuit includes MCU controller, switch controller, excitation signal generator and driving signal circuit;The MCU controller is connected with the switch controller and the detection determination circuit, the switch controller is connected with the switching circuit, the excitation signal generator is connected with the switching circuit, and the driving signal circuit is connected with the switching circuit;The MCU controller is used to send control signal to the switch controller and receive the bit detection result or the liquid leakage detection result output by the detection determination circuit;The switch controller is used to control the working state of the switching circuit according to the control signal;The excitation signal generator is used to output the excitation signal;The driving signal circuit is used to output the driving signal.

[0007] In a technical solution, the switching circuit includes first switch and second switch;The control end of the first switch is connected with the switch controller, the common end of the first switch is connected with the liquid leakage sensor, the first contact end of the first switch is connected with one end of the excitation signal generator, and the second contact end of the first switch is connected with one end of the driving signal circuit;The control end of the second switch is connected with the switch controller, the common end of the second switch is connected with the liquid leakage sensor, the first contact end of the second switch is connected with the other end of the driving signal circuit, and the second contact end of the second switch is connected with the other end of the excitation signal generator.

[0008] In one technical solution, the liquid leakage sensor comprises a first electrode and a second electrode; the first electrode is connected with the common terminal of the first switch and the signal conditioning circuit, and the second electrode is connected with the common terminal of the second switch.

[0009] In one technical solution, the driving signal circuit comprises a first resistor; one end of the first resistor is connected with the power supply terminal, and the other end of the first resistor is connected with the second contact terminal of the first switch.

[0010] In the second aspect, the utility model embodiment further provides a liquid leakage detection device, which comprises the liquid leakage detection circuit in the first aspect and an overflow detection disc; the liquid leakage sensor in the liquid leakage detection circuit is arranged on the overflow detection disc.

[0011] In one technical solution, the overflow detection disc comprises a liquid collecting groove and a detection groove; the detection groove is arranged in the liquid collecting groove, and the liquid leakage sensor is arranged in the detection groove.

[0012] In one technical solution, the overflow detection disc is provided with a dispersing opening for discharging liquid.

[0013] In one technical solution, the liquid leakage detection device further comprises a plurality of liquid receiving grooves, and the plurality of liquid receiving grooves are in communication with the overflow detection disc.

[0014] In the third aspect, the utility model embodiment further provides a sample analyzer, which comprises the liquid leakage detection device in the first aspect.

[0015] Compared with the prior art, the utility model provides a liquid leakage detection circuit, device and sample analyzer, the circuit comprises a control circuit, a switching circuit, a liquid leakage sensor, a signal conditioning circuit and a detection judgment circuit; the control circuit is connected with the switching circuit, the switching circuit is connected with the liquid leakage sensor, the liquid leakage sensor is connected with the signal conditioning circuit, the signal conditioning circuit is connected with the detection judgment circuit, and the detection judgment circuit is connected with the control circuit; the working state of the switching circuit is controlled by the control circuit, and an excitation signal or a driving signal is transmitted to the switching circuit; the excitation signal or the driving signal is transmitted to the liquid leakage sensor through the switching circuit; the output signal of the liquid leakage sensor is processed through the signal conditioning circuit and the detection judgment circuit, so that an in-situ detection result or a liquid leakage detection result is obtained. The utility model transmits the excitation signal or the driving signal to the liquid leakage sensor through the switching circuit, so that the in-situ detection and the liquid leakage detection functions of the sensor can be realized without increasing the wire material, the cost is low, and the reliability of the liquid leakage sensor can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings described in the following embodiment are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 The schematic block diagram of the liquid leakage detection circuit provided by an embodiment of the present application is shown in the figure.

[0018] Figure 2 The schematic block diagram of the liquid leakage detection circuit provided by another embodiment of the present application is shown in the figure.

[0019] Figure 3 The schematic block diagram of the liquid leakage detection circuit provided by an embodiment of the present application is shown in the figure.

[0020] Figure 4 The schematic block diagram of the liquid leakage detection circuit provided by an embodiment of the present application is shown in the figure.

[0021] Figure 5 The schematic block diagram of the liquid leakage detection circuit provided by another embodiment of the present application is shown in the figure.

[0022] Figure 6 The schematic block diagram of the liquid leakage detection device provided by an embodiment of the present application is shown in the figure.

[0023] In the figure, the various reference signs are as follows:

[0024] 10, control circuit; 101, MCU controller; 102, switch controller; 103, excitation signal generator; 104, drive signal circuit; R1, first resistor; 20, switching circuit; 201, first switch; 202, second switch; 30, liquid leakage sensor; 301, first electrode; 302, second electrode; 40, signal conditioning circuit; 50, detection and determination circuit; 60, liquid overflow detection disc; 601, liquid collection groove; 602, detection groove; 70, dispersing port; 80, liquid receiving groove; 90, CPU processor. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The terms such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side surface" and the like mentioned in the present utility model are only for reference of the directions of the attached drawings.

[0027] It should be understood that the terms "comprises" and "comprising", when used in this specification and accompanying claims, indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0028] It should also be understood that the terms used in the present utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in the present utility model specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should be further understood that the term "and / or" used in the present utility model specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0030] Please refer to Figures 1 to 6 , Figure 1 The schematic block diagram of the liquid leakage detection circuit provided by an embodiment of the present utility model; Figure 2 The schematic block diagram of the liquid leakage detection circuit provided by another embodiment of the present utility model; Figure 3 The schematic block diagram of the liquid leakage detection circuit provided by an embodiment of the present utility model, which opens the in-place detection function of the liquid leakage sensor; Figure 4 The schematic block diagram of the liquid leakage detection circuit provided by an embodiment of the present utility model, which opens the liquid leakage detection function; Figure 5 The schematic block diagram of the liquid leakage detection circuit provided by another embodiment of the present utility model; Figure 6 The schematic block diagram of the liquid leakage detection device provided by an embodiment of the present utility model.

[0031] The utility model provides a kind of liquid leakage detection circuit, comprising: control circuit 10, switching circuit 20, leakage sensor 30, signal conditioning circuit 40 and detection determination circuit 50;The control circuit 10 is connected with the switching circuit 20, the switching circuit 20 is connected with the leakage sensor 30, the leakage sensor 30 is connected with the signal conditioning circuit 40, the signal conditioning circuit 40 is connected with the detection determination circuit 50, the detection determination circuit 50 is connected with the control circuit 10;Wherein, the control circuit 10 is used to control the working state of the switching circuit 20, and transmission excitation signal or driving signal to the switching circuit 20;The switching circuit 20 is used to transmission excitation signal or driving signal to the leakage sensor 30 according to the working state;The signal conditioning circuit 40 is used to process the first output signal generated when the leakage sensor 30 is accessed to the excitation signal, to obtain first detection signal;Or for processing the second output signal generated when the leakage sensor 30 is accessed to the driving signal, to obtain second detection signal;The detection determination circuit 50 is used to output in-place detection result to the control circuit 10 according to the first detection signal;Or for outputting liquid leakage detection result to the control circuit 10 according to the second detection signal.

[0032] In the embodiment, referring to Figures 1 to 4 , leakage detection circuit is composed of control circuit 10, switching circuit 20, leakage sensor 30, signal conditioning circuit 40 and detection determination circuit 50, and control circuit 10 will transmission excitation signal or driving signal to switching circuit 20. Wherein, excitation signal is used to detect the in-place condition of leakage sensor 30, and excitation signal is a signal with amplitude, frequency and period variation, including sine wave, cosine wave, square wave, triangular wave and the like. Driving signal is used to detect the liquid leakage condition of instrument, and driving signal is a direct current signal.

[0033] Specifically, control circuit 10 controls the working state of switching circuit 20, and transmission excitation signal or driving signal to switching circuit 20. The working state of switching circuit 20 includes first working state and second working state, and switching circuit 20 transmits excitation signal or driving signal to leakage sensor 30 according to the working state, and excitation signal and driving signal are both transmitted to leakage sensor 30 through switching circuit 20, so that leakage sensor 30 does not need to increase wire respectively to receive excitation signal and driving signal. Referring to Figure 3When the switching circuit 20 is in the first working state, the liquid leakage detection circuit starts the in-place detection function of the liquid leakage sensor 30. The switching circuit 20 transmits the excitation signal to the liquid leakage sensor 30. The liquid leakage sensor 30 inputs the excitation signal and outputs the corresponding first output signal. The signal conditioning circuit 40 processes the first detection signal through signal detection and amplification, and generates the first detection signal. The first detection signal is input into the detection judgment circuit 50. The detection judgment circuit 50 outputs the in-place detection result according to the first detection signal. The in-place detection result is used to indicate whether the liquid leakage sensor 30 is installed in place. Referring to Figure 4 When the switching circuit 20 is in the second working state, the liquid leakage detection circuit starts the liquid leakage detection function. The switching circuit 20 transmits the driving signal to the liquid leakage sensor 30. The liquid leakage sensor 30 inputs the driving signal and outputs the corresponding second output signal. The signal conditioning circuit 40 processes the second detection signal through signal detection and amplification, and generates the second detection signal. The second detection signal is input into the detection judgment circuit 50. The detection judgment circuit 50 outputs the liquid leakage detection result according to the second detection signal. The liquid leakage detection result is used to indicate whether liquid leakage occurs. In addition, the control circuit 10 receives the in-place detection result or the liquid leakage detection result output by the detection judgment circuit 50 to perform corresponding early warning prompts.

[0034] In an embodiment, the detection judgment circuit 50 specifically compares the first detection signal with the corresponding set first target reference value, and then outputs the in-place detection result. Further, if the first detection signal is consistent with the first target reference value, the in-place detection result indicates that the liquid leakage sensor 30 is installed in place. If not, the in-place detection result indicates that the liquid leakage sensor 30 is installed abnormally. In addition, the detection judgment circuit 50 specifically compares the second detection signal with the corresponding set second target reference value, and then outputs the liquid leakage detection result. Further, if the second detection signal is lower than the second target reference value, the liquid leakage detection result indicates that liquid leakage occurs.

[0035] In an embodiment, for a complete liquid leakage detection, after the liquid leakage sensor 30 is installed in the corresponding position, the control circuit 10 first controls the switching circuit 20 to input the excitation signal to the liquid leakage sensor 30 to perform in-place detection of the liquid leakage sensor 30. After the control circuit 10 determines that the liquid leakage sensor 30 is installed in place according to the in-place detection result output by the detection judgment circuit 50, the control circuit 10 controls the switching circuit 20 to input the driving signal to the liquid leakage sensor 30 to perform liquid leakage detection. Preferably, the in-place detection of the liquid leakage sensor 30 does not have to be triggered at all times, but can be triggered at a preset time period (such as a startup, hibernation, maintenance, etc.). After it is determined that the liquid leakage sensor 30 is installed in place, frequent detection of liquid leakage is required to ensure that liquid leakage is discovered in time, and to avoid the timing conflict between the in-place detection and the liquid leakage detection of the liquid leakage sensor 30.

[0036] The liquid leakage detection circuit provided by the utility model switches transmission of excitation signal or driving signal to the liquid leakage sensor 30 through the switching circuit 20, and combines the signal conditioning circuit 40 and the detection judgment circuit 50 to process the output signal of the liquid leakage sensor 30, so that the in-place detection and the liquid leakage detection function of the liquid leakage sensor 30 can be realized without increasing the wire or auxiliary components, the cost can be reduced, the artificial inspection omission can be avoided, and the sensor reliability can be improved. Moreover, when the liquid leakage detection is carried out, the driving signal is applied to the liquid leakage sensor 30 through the switching circuit 20, the energy of the driving signal is low, and the electrochemical corrosion of the liquid leakage sensor 30 under the liquid leakage condition can be greatly reduced.

[0037] In a more specific embodiment, the control circuit 10 comprises an MCU controller 101, a switch controller 102, an excitation signal generator 103 and a driving signal circuit 104; the MCU controller 101 is connected with the switch controller 102 and the detection judgment circuit 50, the switch controller 102 is connected with the switching circuit 20, the excitation signal generator 103 is connected with the switching circuit 20, and the driving signal circuit 104 is connected with the switching circuit 20; the MCU controller 101 is used for sending a control signal to the switch controller 102 and receiving the bit detection result or the liquid leakage detection result output by the detection judgment circuit 50; the switch controller 102 is used for controlling the working state of the switching circuit 20 according to the control signal; the excitation signal generator 103 is used for outputting the excitation signal; and the driving signal circuit 104 is used for outputting the driving signal.

[0038] In the embodiment, referring to Figures 2 to 4 The control circuit 10 is composed of the MCU controller 101, the switch controller 102, the excitation signal generator 103 and the driving signal circuit 104, wherein the MCU controller 101 sends a control signal to the switch controller 102, so that the switch controller 102 controls the working state of the switching circuit 20 according to the control signal, and then the switching circuit 20 transmits the excitation signal output by the excitation signal generator 103 or the driving signal output by the driving signal circuit 104 to the liquid leakage sensor 30, so as to realize the in-place detection function or the liquid leakage detection function of the liquid leakage sensor 30. Moreover, the MCU controller 101 also receives the bit detection result or the liquid leakage detection result output by the detection judgment circuit 50 to give a corresponding early warning prompt.

[0039] In a more specific embodiment, the switching circuit 20 comprises a first switch 201 and a second switch 202; the control end of the first switch 201 is connected with the switch controller 102, the common end of the first switch 201 is connected with the liquid leakage sensor 30, the first contact end of the first switch 201 is connected with one end of the excitation signal generator 103, and the second contact end of the first switch 201 is connected with one end of the driving signal circuit 104; the control end of the second switch 202 is connected with the switch controller 102, the common end of the second switch 202 is connected with the liquid leakage sensor 30, the first contact end of the second switch 202 is connected with the other end of the driving signal circuit 104, and the second contact end of the second switch 202 is connected with the other end of the excitation signal generator 103.

[0040] In the embodiment, referring to Figure 2 , the switching circuit 20 comprises a first switch 201 and a second switch 202, and the first switch 201 and the second switch 202 each comprise a control end, a common end, a first contact end and a second contact end, wherein the common end is connected with the first contact end or the second contact end according to the relevant signal received by the control end. Preferably, the first switch 201 and the second switch 202 can each be a single-pole double-throw switch. Specifically, the second contact end of the first switch 201 is connected with the positive end of the driving signal circuit 104, the first contact end of the second switch 202 is connected with the negative end of the driving signal circuit 104, the control end of the first switch 201 and the control end of the second switch 202 are each connected with the switch controller 102, and the actions of the first switch 201 and the second switch 202 are controlled by the switch controller 102, so that only one set of switches is opened at the same time, the switching of the switches is realized, and the switching of the working states of the switching circuit 20 is realized. Referring to Figure 3 , when the switch controller 102 controls the first switch 201 to be opened and the second switch 202 to be closed, the common end of the first switch 201 is connected with the first contact end of the first switch 201 at this time, the common end of the second switch 202 is connected with the second contact end of the second switch 202, the switching circuit 20 is in the first working state, the excitation signal is input into the liquid leakage sensor 30, and whether the liquid leakage sensor 30 is installed in place is detected. Referring to Figure 4 , when the switch controller 102 controls the first switch 201 to be closed and the second switch 202 to be opened, the common end of the first switch 201 is connected with the second contact end of the first switch 201 at this time, the common end of the second switch 202 is connected with the first contact end of the second switch 202, the switching circuit 20 is in the second working state, the driving signal is input into the liquid leakage sensor 30, and whether the liquid leakage occurs is detected.

[0041] In a more specific embodiment, the liquid leakage sensor 30 comprises a first electrode 301 and a second electrode 302; the first electrode 301 is connected with the common terminal of the first switch 201 and the signal conditioning circuit 40, and the second electrode 302 is connected with the common terminal of the second switch 202.

[0042] In the embodiment, referring to Figure 2 , the liquid leakage sensor 30 comprises a first electrode 301 and a second electrode 302, wherein the first electrode 301 is connected with the common terminal of the first switch 201 and the signal conditioning circuit 40, and the second electrode 302 is connected with the common terminal of the second switch 202, which is simple in structure and low in cost.

[0043] In a more specific embodiment, the driving signal circuit 104 comprises a first resistor R1; one end of the first resistor R1 is connected with the power terminal, and the other end of the first resistor R1 is connected with the second contact terminal of the first switch 201.

[0044] In the embodiment, referring to Figure 5 , the driving signal circuit 104 comprises a first resistor R1, and two ends of the first resistor R1 are respectively connected with the power terminal (for example, Vdd in Figure 5 ) and the second contact terminal of the first switch 201, wherein the power terminal is used for connecting the direct current power supply, and the first resistor R1 is used for dividing voltage with the equivalent resistance of the liquid leakage sensor 30, so as to equivalently regard the liquid leakage sensor 30 as a resistor, and to detect the equivalent resistance state of the liquid leakage sensor 30 by means of resistance voltage division.

[0045] The utility model further provides a kind of liquid leakage detection device, it includes as any preceding implementation described in the liquid leakage detection circuit, and overflow detection disc 60;The liquid leakage sensor 30 in the liquid leakage detection circuit is set on the overflow detection disc 60.

[0046] In the embodiment, referring to Figure 6The liquid leakage sensor 30 is installed on the liquid overflow detection disc 60, which is arranged at a position where liquid leakage is likely to occur on the instrument and is used to receive the liquid leakage. Preferably, the liquid overflow detection disc 60 is made of POM insulating material. After the liquid leakage sensor 30 is installed on the liquid overflow detection disc 60, the control circuit 10 in the liquid leakage detection circuit first controls the switching circuit 20 to input the excitation signal to the liquid leakage sensor 30 for in-situ detection of the liquid leakage sensor 30. After the control circuit 10 determines that the liquid leakage sensor 30 is installed in place according to the in-situ detection result output by the detection judgment circuit 50, the control circuit 10 controls the switching circuit 20 to input the driving signal to the liquid leakage sensor 30 for liquid leakage detection, so as to detect whether a certain amount of liquid leakage is received in the liquid overflow detection disc 60, i.e., whether liquid leakage occurs.

[0047] In a more specific embodiment, the liquid overflow detection disc 60 comprises a liquid collecting groove 601 and a detection groove 602, and the liquid leakage sensor 30 is arranged in the detection groove 602.

[0048] In the embodiment, referring to Figure 6 The liquid overflow detection disc 60 comprises a liquid collecting groove 601 and a detection groove 602, and the detection groove 602 facilitates the collection of liquid. The size of the detection groove 602 is related to the liquid leakage detection sensitivity.

[0049] In an embodiment, referring to Figure 6 The liquid leakage sensor 30 comprises a first electrode 301 and a second electrode 302, and both the first electrode 301 and the second electrode 302 are installed in the detection groove 602. According to the resistance calculation formula R=ρL / S, where ρ represents the resistivity of the liquid leakage, which is determined by the material itself, L represents the length of the equivalent resistance formed by the liquid leakage and the first electrode 301 and the second electrode 302, i.e., L also represents the distance between the first electrode 301 and the second electrode 302, and S represents the cross-sectional area of the equivalent resistance, i.e., S also represents the cross-sectional area of the detection groove 602. Therefore, the distance between the two electrodes or the cross-sectional size of the detection groove 602 can be adjusted to indirectly affect the equivalent resistance formed by the liquid leakage and the two electrodes, so as to realize the increase and decrease of the liquid leakage detection sensitivity under the action of the driving signal. Therefore, the distance between the two electrodes and the volume of the detection groove 602 should not be too large or too small. A smaller distance between the two electrodes and a smaller detection groove 602 are easy to trigger false alarms, and a larger distance between the two electrodes and a larger detection groove 602 require a large amount of liquid leakage to be detected.

[0050] In a more specific embodiment, the liquid overflow detection disc 60 is provided with a dispersing port 70 for draining liquid.

[0051] In the embodiment, referring to Figure 6The overflow detection disc 60 is provided with a dispersing opening 70, wherein the height of the dispersing opening 70 is higher than that of the overflow detection disc 60, and when the amount of the leaked liquid in the overflow detection disc 60 exceeds the height of the dispersing opening 70, the leaked liquid flows out from the dispersing opening 70.

[0052] In a more specific embodiment, the leaked liquid detection device further comprises a plurality of liquid receiving grooves 80, which are all in communication with the overflow detection disc 60.

[0053] In the embodiment, referring to Figure 6 The leaked liquid detection device further comprises a plurality of liquid receiving grooves 80, which are in communication with the overflow detection disc 60 through pipes, and the bottom of each liquid receiving groove 80 is provided with an opening for facilitating the liquid to flow into the overflow detection disc 60 through the pipes. The liquid receiving grooves 80 are arranged in the area where the liquid is easy to leak to receive the leaked liquid and collect the leaked liquid into the overflow detection disc 60, and the number of the liquid receiving grooves 80 can be increased or decreased according to the required detection position. Further, the overflow detection disc 60 is arranged lower than the liquid receiving grooves 80, so as to facilitate the liquid in the liquid receiving grooves 80 to be collected into the overflow detection disc 60 through the pipes by gravity. Preferably, the liquid receiving grooves 80 are made of POM insulating material and are provided with a hula hole for facilitating installation and dismounting.

[0054] The utility model further provides a kind of sample analyzer (not shown), including the leaked liquid detection device as any preceding implementation.

[0055] In the embodiment, the sample analyzer is provided with the leaked liquid detection device as any preceding implementation, so as to have all beneficial effects brought by the technical solutions of the preceding embodiments, which will not be repeated here. In addition, the control circuit 10 of the leaked liquid detection circuit in the leaked liquid detection device can also be electrically connected with the CPU processor 90 in the sample analyzer, and the control circuit 10 sends the bit detection result and the leaked liquid detection result to the CPU processor 90, and then the CPU processor 90 carries out fault alarm (such as sound alarm or indicator light alarm), interface prompt and the like, so as to timely prompt relevant personnel to check and maintain.

[0056] The utility model provides a kind of liquid leakage detection circuit, device and sample analyzer, and the circuit includes control circuit 10, switching circuit 20, leakage sensor 30, signal conditioning circuit 40 and detection determination circuit 50;Control circuit 10 is connected with switching circuit 20, switching circuit 20 is connected with leakage sensor 30, leakage sensor 30 is connected with signal conditioning circuit 40, signal conditioning circuit 40 is connected with detection determination circuit 50, detection determination circuit 50 is connected with control circuit 10;The working state of switching circuit 20 is controlled by control circuit 10 to switching circuit 20 transmission excitation signal or drive signal;Excitation signal or drive signal is transmitted to leakage sensor 30 by switching circuit 20;The output signal of leakage sensor 30 is handled by signal conditioning circuit 40 and detection determination circuit 50, and then in-position detection result or liquid leakage detection result is obtained.The utility model passes through switching circuit 20 and transmits excitation signal or drive signal to leakage sensor 30, can realize sensor in-position detection and liquid leakage detection function under the condition of not increasing wire, low in cost, can improve the reliability of leakage sensor 30.

[0057] The above is only the specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of claims.

Claims

1. A leakage detection circuit, characterized by comprising: The application relates to a liquid leakage detection device. The control circuit, the switching circuit, the liquid leakage sensor, the signal conditioning circuit and the detection judgment circuit are connected in series. The control circuit is used for controlling the working state of the switching circuit and transmitting an excitation signal or a driving signal to the switching circuit. The switching circuit is used for transmitting the excitation signal or the driving signal to the liquid leakage sensor according to the working state. The signal conditioning circuit is used for processing a first output signal generated by the liquid leakage sensor when the excitation signal is accessed to obtain a first detection signal or processing a second output signal generated by the liquid leakage sensor when the driving signal is accessed to obtain a second detection signal. The detection judgment circuit is used for outputting a bit detection result to the control circuit according to the first detection signal or outputting a liquid leakage detection result to the control circuit according to the second detection signal. The control circuit comprises an MCU controller, a switch controller, an excitation signal generator and a driving signal circuit.

2. The liquid leakage detection circuit according to claim 1, characterized by The MCU controller is connected with the switch controller and the detection judgment circuit, the switch controller is connected with the switching circuit, the excitation signal generator is connected with the switching circuit, and the driving signal circuit is connected with the switching circuit. The MCU controller is used for sending a control signal to the switch controller and receiving the bit detection result or the liquid leakage detection result output by the detection judgment circuit; the switch controller is used for controlling the working state of the switching circuit according to the control signal; the excitation signal generator is used for outputting the excitation signal; and the driving signal circuit is used for outputting the driving signal. The switching circuit comprises a first switch and a second switch; the control end of the first switch is connected with the switch controller, the common end of the first switch is connected with the liquid leakage sensor, the first contact end of the first switch is connected with one end of the excitation signal generator, and the second contact end of the first switch is connected with one end of the driving signal circuit.

3. The liquid leakage detection circuit according to claim 2, characterized by The control end of the second switch is connected with the switch controller, the common end of the second switch is connected with the liquid leakage sensor, the first contact end of the second switch is connected with the other end of the driving signal circuit, and the second contact end of the second switch is connected with the other end of the excitation signal generator. The liquid leakage sensor comprises a first electrode and a second electrode; the first electrode is connected with the common end of the first switch and the signal conditioning circuit, and the second electrode is connected with the common end of the second switch.

4. The liquid leakage detection circuit according to claim 3, characterized by The driving signal circuit comprises a first resistor; one end of the first resistor is connected with a power supply end, and the other end of the first resistor is connected with the second contact end of the first switch.

5. The liquid leakage detection circuit according to claim 4, characterized by ​ 6. A leakage detection device characterized by comprising: The liquid leakage detection circuit as claimed in any one of claims 1 to 5, and a liquid overflow detection disc; the liquid leakage sensor in the liquid leakage detection circuit is arranged on the liquid overflow detection disc.

7. The liquid leakage detection device according to claim 6, wherein The liquid overflow detection disc comprises a liquid collecting groove and a detection groove, the detection groove is arranged in the liquid collecting groove, and the liquid leakage sensor is arranged in the detection groove.

8. The liquid leakage detection device according to claim 6, wherein The liquid overflow detection disc is provided with a dispersing port for discharging liquid.

9. The liquid leakage detection device according to claim 6, wherein The liquid overflow detection disc is further provided with a plurality of liquid receiving grooves in communication with the liquid overflow detection disc.

10. A sample analyzer characterized by, The liquid leakage detection device as claimed in any one of claims 6 to 9.

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