Liquid automatic extraction system and method and analyzer

Abstract

The present invention provides a liquid automatic extraction system and method and an analyzer, the system includes a diaphragm pump, a first container and a second container connected in sequence, the diaphragm pump is connected to a control circuit; a pressure sensor is arranged at the liquid outlet pipe of the diaphragm pump; the control circuit controls the diaphragm pump to extract liquid from a liquid source to the first container, and transports the liquid to the second container through the first container; the pressure sensor detects the pressure of the liquid outlet of the liquid outlet pipe, and when the pressure of the liquid outlet is not less than the preset pressure threshold, the diaphragm pump is controlled to disconnect the internal switch and stop extracting liquid from the liquid source until the pressure of the liquid outlet is less than the preset pressure threshold, and the diaphragm pump is controlled to close the internal switch and continue to extract liquid from the liquid source to the first container. The system stops extracting liquid when the pressure of the liquid outlet of the diaphragm pump is not less than the preset pressure threshold, and extracts liquid when it is less than the preset pressure threshold, so as to realize automatic and non-delay replenishment of liquid to the first container.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to an automatic liquid extraction system and method and an analyzer. Background Art

[0002] At present, when extracting liquid, the liquid discharge pipe and the liquid level sensor enter the container together, the liquid pipe serves as the liquid discharge pipeline, and the liquid level sensor performs liquid level detection. It is effective for discharging non-viscous liquids, but viscous liquids (100-1000mPa·s) will stick to the liquid level sensor, causing the liquid level sensor to react late or even fail, thereby causing the container to be unable to replenish liquid in time. Summary of the invention

[0003] The object of the present invention is to provide a liquid automatic extraction system and method and an analyzer to achieve automatic and delay-free replenishment of liquid to a first container.

[0004] The present invention provides an automatic liquid extraction system, the system comprising: a diaphragm pump, a first container and a second container connected in sequence; wherein the diaphragm pump is connected to a control circuit; a pressure sensor is provided at a liquid outlet pipe of the diaphragm pump; a liquid source is pre-stored with liquid;

[0005] The control circuit is used to control the diaphragm pump to draw liquid from the liquid source into the first container, and to transport the liquid to the second container through the first container;

[0006] The pressure sensor is used to detect the pressure at the liquid outlet of the liquid outlet pipe. When the pressure at the liquid outlet is not less than the preset pressure threshold, the internal switch of the diaphragm pump is controlled to be disconnected to stop extracting liquid from the liquid source to the first container, until the pressure at the liquid outlet is less than the preset pressure threshold, the internal switch of the diaphragm pump is controlled to be closed to continue extracting liquid from the liquid source to the first container.

[0007] Furthermore, the control circuit includes: a relay, a micro control unit, and a liquid inlet start button connected in sequence; wherein the relay and the micro control unit are both connected to the power supply circuit;

[0008] The microcontrol unit is used to send a trigger signal generated after the liquid inlet start key is triggered to the relay;

[0009] The relay is used to connect the power circuit after receiving the trigger signal to provide working current to the diaphragm pump, so that the diaphragm pump draws liquid from the liquid source into the first container.

[0010] Further, the power circuit includes: an adapter, a female socket, and a switch connected in sequence;

[0011] The switch is connected to the relay and is used to provide the first voltage delivered by the adapter to the relay.

[0012] Furthermore, the power supply circuit further comprises: a first voltage conversion module connected to the switch, and a second voltage conversion module connected to the first voltage conversion module and the micro control unit respectively;

[0013] The first voltage conversion module is used to convert the first voltage delivered by the adapter into a second voltage;

[0014] The second voltage conversion module is used for converting the second voltage delivered by the first voltage conversion module into a third voltage and sending the third voltage to the micro control unit.

[0015] Furthermore, the system also includes a current detection chip; the current detection chip is connected to the relay and the micro control unit respectively;

[0016] The current detection chip is used to collect the working current provided by the relay, and convert the working current into a working voltage and send it to the micro control unit;

[0017] The microcontroller unit is used to obtain the duration of the target voltage in the working voltage being greater than the voltage preset threshold, and if the duration is less than the third preset threshold, determine that the pressure at the outlet of the liquid outlet pipe is not less than the pressure preset threshold.

[0018] Furthermore, the micro control unit is used to control the relay to disconnect from the power circuit if the duration is not less than a third preset threshold value, so as to control the diaphragm pump to stop extracting liquid from the liquid source into the first container.

[0019] Furthermore, the microcontroller unit is also connected to an alarm and an alarm cancellation button;

[0020] The microcontroller unit is also used to send an alarm signal to the alarm and the alarm cancellation button if the duration is not less than a third preset threshold value; wherein the alarm signal is used to instruct the alarm to emit a sound, and the alarm signal is also used to instruct the alarm cancellation button to emit light;

[0021] The microcontrol unit is also used for controlling the alarm to stop sounding and the alarm cancellation button to stop emitting light if a trigger signal for triggering the alarm cancellation button is received.

[0022] Furthermore, the current detection chip is used to collect the current current of the relay and convert the current current into the current voltage and send it to the micro control unit;

[0023] The microcontroller unit is also used to determine whether a sudden change occurs in the current voltage; if a sudden change occurs, the control relay is disconnected from the power circuit, and when the duration of the disconnection reaches a fourth preset threshold, the control relay is reconnected to the power circuit to continue to extract liquid from the liquid source into the first container.

[0024] Furthermore, the third preset threshold is a first calculation result obtained by dividing the volume of the first container by the first difference; wherein the first difference is the difference between the liquid inlet speed and the liquid discharge speed of the first container.

[0025] Furthermore, the fourth preset threshold is a second calculation result obtained by dividing 20% ​​of the volume of the first container by the discharge speed of the first container.

[0026] The present invention provides a method for automatically extracting liquid, the method comprising:

[0027] The control circuit controls the diaphragm pump to extract liquid from the liquid source to the first container, and transport the liquid to the second container through the first container; wherein a pressure sensor is provided at the liquid outlet pipe of the diaphragm pump;

[0028] The pressure sensor detects the pressure at the liquid outlet of the liquid outlet pipe. When the pressure at the liquid outlet is not less than the preset pressure threshold, the internal switch of the diaphragm pump is controlled to be disconnected to stop extracting liquid from the liquid source to the first container, until the pressure at the liquid outlet is less than the preset pressure threshold, the internal switch of the diaphragm pump is controlled to be closed to continue extracting liquid from the liquid source to the first container.

[0029] The present invention provides an analyzer comprising any one of the above-mentioned automatic liquid extraction systems.

[0030] The present invention provides an automatic liquid extraction system and method and an analyzer, the system comprising a diaphragm pump, a first container and a second container connected in sequence, the diaphragm pump being connected to a control circuit; a pressure sensor being provided at the liquid outlet pipe of the diaphragm pump; the control circuit controls the diaphragm pump to extract liquid from a liquid source into the first container, and to transport the liquid to the second container through the first container; the pressure sensor detects the pressure at the liquid outlet of the liquid outlet pipe, and when the pressure at the liquid outlet is not less than a preset pressure threshold, the diaphragm pump is controlled to disconnect an internal switch and stop extracting liquid from the liquid source, until the pressure at the liquid outlet is less than the preset pressure threshold, and the diaphragm pump is controlled to close an internal switch and continue extracting liquid from the liquid source into the first container. The system

[0031] By setting the diaphragm pump to stop extracting liquid when the pressure at the liquid outlet is not less than the preset pressure threshold, and to extract liquid when the pressure is less than the preset pressure threshold, automatic and time-free replenishment of liquid to the first container can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art,

[0033] The following will briefly introduce the drawings required for use in specific implementation methods or descriptions of the prior art. Obviously, the drawings in the following description are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the structure of an automatic liquid extraction system provided by an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of an automatic liquid extraction process provided by an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of another structure of automatic liquid extraction provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of another structure of automatic liquid extraction provided by an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of another automatic liquid extraction process provided by an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of another structure of automatic liquid extraction provided by an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of another structure of automatic liquid extraction provided by an embodiment of the present invention;

[0041] Figure 8 A schematic diagram of another structure of automatic liquid extraction provided by an embodiment of the present invention;

[0042] Fig. 9 Another current acquisition trigger circuit diagram provided by an embodiment of the present invention;

[0043] Fig.10 A flow chart of a method for automatically extracting liquid provided by an embodiment of the present invention;

[0044] Fig.11 A schematic diagram of the structure of an analyzer provided in an embodiment of the present invention. 具体实施方式

[0045] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] At present, when extracting liquid, the commonly used technical means is to enter the container together with the liquid discharge pipe and the liquid level sensor, the liquid pipe is used as the liquid discharge pipeline, and the liquid level sensor is used for liquid level detection. If the liquid is viscous or slightly viscous liquid (100-1000mPa·s), when the liquid level sensor detects the liquid level of the container, the viscous or slightly viscous liquid will stick to the liquid level sensor, causing the liquid level sensor to react delayed or even fail, thereby causing the container to be unable to replenish liquid in time.

[0047] The liquid level sensor has different lifespans in different solvents, so passing the liquid level sensor into a container will affect its lifespan. The cost of the liquid level sensor is also high, and there are great operational risks during installation.

[0048] To facilitate understanding of this embodiment, an automatic liquid extraction system disclosed in an embodiment of the present invention is first introduced in detail.

[0049] The embodiment of the present invention provides a liquid automatic extraction system, such as Figure 1 As shown, the system includes a diaphragm pump 12 , a first container 13 and a second container 14 which are connected in sequence; wherein the diaphragm pump 12 is connected to a control circuit 15 ; and a pressure sensor 16 is provided at the liquid outlet pipe of the diaphragm pump 12 .

[0050] The control circuit 15 is used to control the diaphragm pump 12 to extract liquid from the liquid source 11 to the first container 13, and transport the liquid to the second container 14 through the first container 13; the pressure sensor 16 is used to detect the pressure at the liquid outlet of the liquid outlet pipe. When the pressure at the liquid outlet is not less than the preset pressure threshold, the diaphragm pump 12 is controlled to disconnect the internal switch of the diaphragm pump 12 to stop extracting liquid from the liquid source 11 to the first container 13, until the pressure at the liquid outlet is less than the preset pressure threshold, and the diaphragm pump 12 is controlled to close the internal switch of the diaphragm pump 12 to continue extracting liquid from the liquid source 11 to the first container 13.

[0051] The liquid source 11 may be a faucet or a container filled with liquid. It is understandable that the liquid source 11 may be a part of an automatic liquid extraction system or a liquid source set in the environment.

[0052] The first container 13 and the second container 14 may be general plastic containers, such as boxes, cans, etc.

[0053] The above-mentioned diaphragm pump 12 can be connected to the interior of the liquid source 11 through a liquid inlet pipe, and connected to the interior of the first container 13 through a liquid outlet pipe; the first container 13 is connected to the interior of the second container 14 through a delivery pipe, and the first container 13 can be arranged above the second container 14, and the liquid in the first container 13 is transported to the second container 14 through the delivery pipe by gravity, wherein the liquid inlet pipe, the liquid outlet pipe and the delivery pipe can all adopt conventional medical silicone tubes.

[0054] The above-mentioned liquid can be a viscous liquid or a slightly viscous liquid, such as a system reagent containing a high concentration of glycerol. It can be understood that the above-mentioned liquid is not limited to a viscous liquid or a slightly viscous liquid, and can also be other liquids, such as a system reagent with a cleaning agent added in in vitro testing.

[0055] The above-mentioned preset pressure threshold value can be understood as a critical pressure, which is generally set according to the type of liquid, and the range is usually between 100 kPa and 500 kPa. Assuming that the liquid is soybean oil, the critical pressure can be set to 300 kPa. Specifically, the critical pressure can be adjusted by adjusting the opening of the outlet valve of the diaphragm pump 12, and the critical pressure is pre-input into the pressure sensor 16 disposed at the outlet pipe of the diaphragm pump 12.

[0056] The control circuit 15 includes a relay 151, a microcontroller unit 152, and a liquid inlet start button 153 connected in sequence; wherein the relay 151 and the microcontroller unit 152 are both connected to the power supply circuit 17. The microcontroller unit 152 is used to send a trigger signal generated after the liquid inlet start button 153 is triggered to the relay 151; the relay 151 is used to connect the power supply circuit 17 after receiving the trigger signal, so as to provide a working current to the diaphragm pump 12, so that the diaphragm pump 12 extracts liquid from the liquid source 11 into the first container 13.

[0057] The above-mentioned relay 151 is an electrical control device, which is actually an "automatic switch" that uses a small current to control the operation of a large current. Specifically, a 40892 relay 151 can be used; the microcontroller unit 152 (MCU) can use an STM32 single-chip microcomputer; the liquid inlet start button 153 can be set at the top of the outer side of the first container 13; the above-mentioned power module supplies power to the relay 151 and the microcontroller unit 152.

[0058] In the specific implementation process, please refer to Figure 2 The schematic diagram of a liquid automatic extraction process is shown. The user can pre-set the critical pressure of the diaphragm pump 12 as P according to the type of liquid, seal the liquid outlet of the diaphragm pump 12, the liquid discharge port of the diaphragm pump 12, the first container 13 and the second container 14. When the user presses the liquid inlet start key 153 as needed, the microcontroller unit 152 sends a trigger signal to the relay 151, controls the relay 151 to close, connects the power circuit 17 and the diaphragm pump 12, and the diaphragm pump 12 obtains current after the power circuit 17 is connected to start the liquid extraction work. Specifically, the liquid is extracted after the liquid inlet start key 153 is triggered, and the diaphragm pump 12 transports the liquid from the A box (liquid source 11) to the B box (first container 13) and then to the C box (second container 14).

[0059] The pressure sensor 16 detects the outlet pressure of the outlet pipe of the diaphragm pump 12 in real time, and compares the detected outlet pressure with the critical pressure input previously (equivalent to the pressure sensor 16 determining whether the outlet pressure is less than the critical pressure). When it is first detected that the outlet pressure is greater than or equal to P, the pressure sensor 16 sends a disconnection command signal to the diaphragm pump 12 to control the diaphragm pump 12 to disconnect the internal switch of the diaphragm pump 12 and stop pumping liquid (the diaphragm pump 12 stops transporting liquid from box A to box B). At this time, the liquids in boxes B and C are both full, and the diaphragm pump 12 stops working due to excessive pressure. The relay 151 remains in a closed state, and the power supply circuit 17 still supplies power to the diaphragm pump 12. As time goes on, the C box may be consumed according to actual demand. As the liquid in the C box is consumed, the pressure at the liquid outlet will change. During this process, when the pressure sensor 16 detects that the pressure at the liquid outlet is less than P, it sends a closing command signal to the diaphragm pump 12 to control the diaphragm pump 12 to close the internal switch of the diaphragm pump 12 and continue to pump liquid until the pressure sensor 16 detects that the pressure at the liquid outlet is greater than or equal to P again. When the pressure sensor 16 detects that the pressure at the liquid outlet is greater than or equal to P again, it repeats the process of sending a disconnection command signal to the diaphragm pump 12 to control the diaphragm pump 12 to disconnect the internal switch of the diaphragm pump 12 and stop pumping liquid.

[0060] The above-mentioned automatic liquid extraction system includes a diaphragm pump, a first container and a second container connected in sequence, and the diaphragm pump is connected to a control circuit; a pressure sensor is provided at the outlet pipe of the diaphragm pump; the control circuit controls the diaphragm pump to extract liquid from the liquid source to the first container, and transports the liquid to the second container through the first container; the pressure sensor detects the pressure at the outlet of the liquid pipe, and when the pressure at the outlet is not less than the preset pressure threshold, the diaphragm pump is controlled to disconnect the internal switch and stop extracting liquid from the liquid source until the pressure at the outlet is less than the preset pressure threshold, and the diaphragm pump is controlled to close the internal switch and continue to extract liquid from the liquid source to the first container. The system stops extracting liquid when the pressure at the outlet of the diaphragm pump is not less than the preset pressure threshold, and extracts liquid when it is less than the preset pressure threshold, so as to realize automatic and delay-free replenishment of liquid to the first container.

[0061] Based on the above-mentioned automatic liquid extraction system, the embodiment of the present invention also provides another automatic liquid extraction system, such as Figure 3 As shown, the power supply circuit 17 includes: an adapter 171 , a female socket 172 , and a switch 173 connected in sequence; the switch 173 is connected to the relay 151 to provide the first voltage delivered by the adapter 171 to the relay 151 .

[0062] Specifically, the power supply circuit 17 further includes a first voltage conversion module 174 connected to the switch 173, and a second voltage conversion module 175 connected to the first voltage conversion module 174 and the micro control unit 152 respectively; the first voltage conversion module 174 is used to convert the first voltage delivered by the adapter 171 into a second voltage conversion module 175.

[0063] the second voltage conversion module 175 is used to convert the second voltage delivered by the first voltage conversion module into a third voltage and send it to the micro control unit 152.

[0064] In the specific implementation process, the above adapter can be plugged into a DC (direct current)

[0065] A stable power supply (such as 24V voltage) is provided on the female socket, and the switch can be a boat-type switch. By closing the boat-type switch, the power supply can be provided to the first voltage conversion module (specifically, a Buck converter can be used), and the 24V voltage (first voltage) is stepped down to 5V (second voltage). The first voltage conversion module then steps down the 5V voltage to 3.3V (third voltage) through the second voltage conversion module (specifically, an LDO converter can be used). 5V and 3.3V provide power to the microcontroller unit, and the 24V power supply can also be directly provided to the relay by closing the boat-type switch.

[0066] Based on the above-mentioned automatic liquid extraction system, the embodiment of the present invention also provides another automatic liquid extraction system, such as Figure 4 As shown, the system also includes a current detection chip 18; the current detection chip 18 is connected to the relay 151 and the micro control unit 152 respectively; the current detection chip 18 is used to collect the working current provided by the relay 151, and convert the working current into a working voltage and send it to the micro control unit

[0067] Element 152; the microcontroller unit 152 is used to obtain the duration of the target voltage 5 in the working voltage that is greater than the voltage preset threshold value, for example, the voltage preset threshold value can be 0.75V (working current 1.5A*sampling resistance 0.01R*50 times=0.75V); if the duration is less than the third preset threshold value, it is determined that the pressure at the outlet of the liquid outlet pipe is not less than the pressure preset threshold value. The microcontroller unit 152 is used to control the relay 151 to disconnect from the power supply circuit 17 if the duration is not less than the third preset threshold value, so as to control the diaphragm pump 12 to stop extracting liquid from the liquid source 11 to the first container 13.

[0068] During the specific implementation process, there may be a risk of leakage when the liquid is transported, such as if the delivery pipe is not tightly connected or there are cracks in the delivery pipe.

[0069] In order to detect whether there is leakage in the system, a time threshold (equivalent to the third preset threshold) can be pre-entered in the microcontroller unit. The time threshold can be the first operation result obtained by dividing the volume of the first container by the first difference; wherein the first difference is the difference between the liquid inlet speed and the liquid discharge speed of the first container. Specifically, assuming that the volume of the first container is 6L, the liquid inlet speed of the first container (that is, the liquid discharge speed of the liquid outlet pipe is 2L / min), and the liquid discharge speed of the first container (that is, the liquid discharge speed of the delivery pipe is 1L / min), the time threshold is 6min (minutes). In actual implementation, since the consumption of liquid in the second container is very small, it will not have much impact on the time (time threshold) used to fill the entire A box and B box with liquid, that is, the working time of the diaphragm pump.

[0070] Then, the working current provided by the relay to the diaphragm pump is collected through the current detection chip (specifically, the INA194 chip can be used). For actual implementation, please refer to the following: Figure 5 Another schematic diagram of the automatic extraction process of liquid shown, assuming that the diaphragm pump is pumping liquid, the current detection chip can collect a relatively large current, corresponding to a large voltage, if the diaphragm pump stops pumping liquid due to excessive pressure, the current detection chip can collect a relatively small current, corresponding to a small voltage, so a voltage threshold (equivalent to the voltage preset threshold) can be input in advance in the microcontroller unit. The current detection chip converts the collected current into a voltage and sends it to the microcontroller unit. If the voltage sent is greater than the voltage preset threshold, it is considered to be the target voltage (the voltage corresponding to the diaphragm pump when it is working). A timer is provided inside the microcontroller unit for accumulating the duration of the target voltage. Assuming that the pre-entered N (the third preset threshold) is 6 (equivalent to current sampling, judging whether the duration of the working current in the current is more than N minutes), when the timer counts to 6, the target voltage still exists, then the microcontroller unit can send a command signal to the relay to control the relay to disconnect, thereby stopping the diaphragm pump (equivalent to the internal timer counting N minutes, which will cut off the power supply at the power end, thereby stopping the diaphragm pump). When the timer counts to 6 or before 6 (such as 4, 5, etc.), the target voltage no longer exists, then it can be confirmed that box B and box C are full of liquid, and the diaphragm pump stops working (the diaphragm pump stops transporting liquid from box A to box B) due to excessive pressure (the outlet pressure is greater than or equal to the critical pressure). At this time, the adapter 171 still supplies power to the diaphragm pump.

[0071] The duration of the above target voltage can represent the pumping time of the diaphragm pump. If the pumping time is greater than the set time threshold, it means that the pressure at the outlet has not been greater than or equal to the preset critical pressure, and the diaphragm pump has been pumping liquid. Therefore, it is possible that leakage has caused the B and C boxes to be unable to be filled with liquid (serious leakage), or leakage has caused the B and C boxes to take more than the preset time to be filled with liquid (minor leakage).

[0072] Based on the above-mentioned automatic liquid extraction system, the embodiment of the present invention also provides another automatic liquid extraction system, such as Figure 6 As shown, the microcontroller unit is also connected to the alarm 19 and the alarm cancellation button 20; the microcontroller unit is also used to send an alarm signal to the alarm and the alarm cancellation button if the duration is not less than a third preset threshold; wherein the alarm signal is used to instruct the alarm to make a sound, and the alarm signal is also used to instruct the alarm cancellation button to emit light; the microcontroller unit is also used to control the alarm to stop making a sound and the alarm cancellation button to stop emitting light if a trigger signal for triggering the alarm cancellation button is received.

[0073] The alarm canceling button can be arranged on the top of the outer side of the first container. The alarm can be a buzzer or other device that can emit a sound alarm. Figure 7 Another schematic diagram of the automatic liquid extraction process is shown. After the internal timer counts for N minutes, the power supply at the power end is cut off, and the diaphragm pump stops working (that is, the risk of leakage is detected), the microcontroller sends an alarm signal to the buzzer and the alarm cancellation button, so that the buzzer sounds and the alarm cancellation button emits orange light, reminding the staff to check the air tightness of the system liquid circuit (equivalent to the buzzer and button emitting an audible and visual alarm of leakage risk, reminding the staff to take the initiative to check and maintain). The user can also choose to cancel the audible and visual alarm according to actual needs. Specifically, in order to avoid the trouble of the sound and light alarm to the customer, the alarm cancellation button can be pressed. The microcontroller receives the trigger signal of the alarm cancellation button, controls the buzzer to stop making sounds, and the alarm cancellation button to stop emitting orange light (equivalent to the alarm cancellation button being triggered, and the buzzer and button stop emitting audible and visual alarms of leakage risk).

[0074] In actual implementation, the above-mentioned relay, micro control unit, drainage start button, alarm cancellation button, buzzer, current detection chip, female socket, switch, first voltage conversion module, and second voltage conversion module can all be integrated into a PCB (circuit board).

[0075] In the specific implementation process, see Figure 8Another schematic diagram of the automatic liquid extraction process is shown. The liquid consumption of box C is usually a small amount and multiple times. Therefore, when the diaphragm pump stops working for the first time due to excessive pressure, assuming that the liquid in box C is consumed and the pressure at the outlet changes, the current sampling can be continued to determine whether the current working current AD value has a sudden change. Since the diaphragm pump did not stop supplying power to the diaphragm pump after it stopped working for the first time due to excessive pressure, the current detection chip can continue to collect the current current of the relay and convert the current current into the current voltage (equivalent to the above-mentioned AD value) and send it to the microcontroller unit. Specifically, the sudden change can be understood as the current current suddenly changing from a low value to a high value (corresponding to the current voltage received by the microcontroller suddenly changing from a low value to a high value) or the current current suddenly changing from a high value to a low value (corresponding to the current voltage received by the microcontroller suddenly changing from a low value to a high value). Under normal circumstances, the diaphragm pump will have a lower AD value when it stops working and a higher AD value when it is working. Therefore, the MCU processor (microcontroller unit) can determine the working state of the pump by judging the current working current AD value.

[0076] Since the liquid in box C is consumed in small amounts multiple times, the time interval between the start and stop of each pumping by the diaphragm pump is very short, resulting in frequent pumping by the diaphragm pump, which affects its service life. In actual implementation, near the critical pressure, the AD value will change suddenly. The microcontroller unit can control the power supply of the diaphragm pump by controlling the relay to disconnect (cut off the power supply at the power end), delay for n minutes (equivalent to the fourth preset threshold) and then close the relay to control the power supply of the diaphragm pump, thereby solving the problem of frequent pumping of the diaphragm pump near the critical pressure.

[0077] Specifically, the fourth preset threshold value can be pre-entered in the microcontroller unit, and the fourth preset threshold value can be the second operation result obtained by dividing 20% ​​of the volume of the first container by the discharge speed of the first container, that is, the time taken for 20% of the liquid in the first container to be discharged through the discharge port. Specifically, assuming that the volume of the first container is 6L, 20% of the volume of the first container is 1.2L, and the discharge speed of the first container (that is, the discharge speed of the delivery pipe is 0.3L / min), the time threshold value is 4min (minutes).

[0078] If the current working current AD value suddenly changes (from a low value to a high value), it means that as the liquid in box C is consumed, the outlet pressure is now less than the critical pressure, and the diaphragm pump continues to work. The microcontroller unit can send a control signal to the relay to control the relay to disconnect (cut off the power supply at the power end) so that the diaphragm pump stops working due to power outage. When the power outage lasts for n minutes, the relay is controlled to close again so that the diaphragm pump can be powered on and work.

[0079] When the relay is closed, the diaphragm pump is powered on and works for a period of time, and it is detected that the current working current AD value suddenly changes (from a high value to a low value), indicating that as the diaphragm pump draws liquid into box B, the outlet pressure is greater than or equal to the critical pressure at this time, and the diaphragm pump stops working. The microcontroller unit can send a control signal to the relay to control the relay to disconnect (cut off the power supply at the power end) so that the diaphragm pump stops working due to power failure. When the power failure lasts for n minutes, the relay is controlled to close again to enable the diaphragm pump to be powered on and work.

[0080] If the current working current AD value has not suddenly changed, it can be determined whether the outlet pressure is less than the critical pressure. If it is less than the critical pressure, the diaphragm pump continues to work. Specifically, when the relay is closed and the diaphragm pump is powered on and works for a period of time, it is detected that the current working current AD value has not suddenly changed and remains high, the outlet pressure is less than the critical pressure, and the diaphragm pump continues to work; if it is not less than the critical pressure, the diaphragm pump still stops working. Specifically, after the diaphragm pump stops working for the first time, it is detected that the current working current AD value has not suddenly changed and remains low, the outlet pressure is not less than the critical pressure, and the diaphragm pump continues to stop working.

[0081] For a better understanding of the above embodiments, please refer to Fig. 9 In the current acquisition trigger circuit diagram shown, the collector of the transistor (Q6) is connected to the relay (K1), and the trigger signal (pump MCU) sent by the microcontroller is sent to the relay through the transistor to control the relay to close, so as to connect the 24V power supply and supply power to the diaphragm pump terminal (J4503). In actual implementation, the maximum current of the Q6 collector is 0.5A, the amplification factor is 100-200, the rated current of the K1 control terminal is 9.2mA, the rated working voltage of the diaphragm pump is 24V, and the rated working current is 3A. The working current of the diaphragm pump generates a 0.03V voltage through the sampling resistor (R37, R40), and this weak sampling voltage is amplified by 50 times the INA194 current amplifier chip (current detection chip) to generate a 0.15V voltage. This voltage will be directly connected to the MCU to collect the ADC signal. This ADC signal is used as the basis for judging the current working current, and the current working state of the diaphragm pump is monitored by the ADC value.

[0082] The embodiment of the present invention also provides a method for automatically extracting liquid, such as Fig.10 As shown, the method comprises the following steps:

[0083] Step S102, the control circuit controls the diaphragm pump to extract liquid from the liquid source into the first container, and transport the liquid to the second container through the first container; wherein a pressure sensor is provided at the liquid outlet pipe of the diaphragm pump.

[0084] Step S104, the pressure sensor detects the pressure at the liquid outlet of the liquid outlet pipe. When the pressure at the liquid outlet is not less than the preset pressure threshold, the internal switch of the diaphragm pump is controlled to be disconnected to stop extracting liquid from the liquid source to the first container, until the pressure at the liquid outlet is less than the preset pressure threshold, the internal switch of the diaphragm pump is controlled to be closed to continue extracting liquid from the liquid source to the first container.

[0085] The automatic liquid extraction method provided above includes a control circuit controlling a diaphragm pump to extract liquid from a liquid source to a first container, and to deliver the liquid to a second container through the first container; a pressure sensor detects the pressure at the outlet of the liquid outlet pipe, and when the pressure at the outlet is not less than a preset pressure threshold, controls the diaphragm pump to disconnect an internal switch and stop extracting liquid from the liquid source until the pressure at the outlet is less than the preset pressure threshold, controls the diaphragm pump to close an internal switch, and continues to extract liquid from the liquid source to the first container. This method stops extracting liquid when the pressure at the outlet of the diaphragm pump is not less than a preset pressure threshold, and extracts liquid when the pressure is less than the preset pressure threshold, so that liquid can be automatically replenished to the first container without delay.

[0086] The implementation principle and technical effects of the automatic liquid extraction method provided in the embodiment of the present invention are the same as those of the aforementioned automatic liquid extraction system embodiment. For the embodiment of the automatic liquid extraction method, reference may be made to the corresponding contents in the aforementioned automatic liquid extraction system embodiment.

[0087] The embodiment of the present invention also provides an analyzer, such as Fig.11 As shown, the analyzer 30 includes any of the above-mentioned automatic liquid extraction systems 301.

[0088] The above analyzer may be an in vitro detector, for example, a chemiluminescence analyzer, and specifically an electrochemiluminescence analyzer.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid automatic extraction system, characterized in that: The system comprises: a diaphragm pump, a first container and a second container which are connected in sequence; wherein the diaphragm pump is connected to a control circuit; and a pressure sensor is arranged at the liquid outlet pipe of the diaphragm pump; The control circuit is used to control the diaphragm pump to extract the liquid from the liquid source into the first container, and to transport the liquid to the second container through the first container; The pressure sensor is used to detect the pressure of the liquid outlet of the liquid outlet pipe, and when the pressure of the liquid outlet is not less than the preset pressure threshold, the internal switch of the diaphragm pump is controlled to be disconnected to stop extracting the liquid from the liquid source to the first container, until the pressure of the liquid outlet is less than the preset pressure threshold, and the internal switch of the diaphragm pump is controlled to be closed to continue extracting the liquid from the liquid source to the first container; The control circuit comprises: a relay, a micro control unit, and a liquid inlet start button connected in sequence; wherein the relay and the micro control unit are both connected to a power supply circuit; The micro control unit is used to send a trigger signal generated after the liquid inlet start key is triggered to the relay; The relay is used to connect the power circuit after receiving the trigger signal to provide working current to the diaphragm pump, so that the diaphragm pump extracts the liquid from the liquid source into the first container; the liquid is a viscous or slightly viscous liquid; The system further comprises a current detection chip; the current detection chip is respectively connected to the relay and the micro control unit; The current detection chip is used to collect the working current provided by the relay, and convert the working current into a working voltage and send it to the micro control unit; The microcontroller unit is used to obtain the duration of the target voltage in the working voltage being greater than the preset voltage threshold, and if the duration is less than a third preset threshold, determine that the pressure at the liquid outlet of the liquid outlet pipe is not less than the preset pressure threshold; The micro control unit is further configured to control the relay to be disconnected from the power supply circuit if the duration is not less than the third preset threshold, so as to control the diaphragm pump to stop extracting the liquid from the liquid source into the first container.

2. The automatic liquid extraction system according to claim 1, characterized in that: The power supply circuit comprises: an adapter, a female socket, and a switch connected in sequence; The switch is connected to the relay to provide the first voltage delivered by the adapter to the relay.

3. The automatic liquid extraction system according to claim 2, characterized in that: The power supply circuit further comprises: a first voltage conversion module connected to the switch, and a second voltage conversion module connected to the first voltage conversion module and the micro control unit respectively; The first voltage conversion module is used to convert the first voltage delivered by the adapter into a second voltage; The second voltage conversion module is used for converting the second voltage delivered by the first voltage conversion module into a third voltage and sending the third voltage to the micro control unit.

4. The automatic liquid extraction system according to claim 1, characterized in that: The micro control unit is also connected to an alarm and an alarm cancellation button; The microcontroller unit is further configured to send an alarm signal to the alarm and the alarm cancellation button if the duration is not less than the third preset threshold; wherein the alarm signal is used to instruct the alarm to emit a sound, and the alarm signal is also used to instruct the alarm cancellation button to emit light; The micro control unit is also used for controlling the alarm to stop making sound and controlling the alarm cancel button to stop emitting light if a trigger signal for triggering the alarm cancel button is received.

5. The automatic liquid extraction system according to claim 1, characterized in that: The current detection chip is used to collect the current current of the relay, and convert the current current into a current voltage and send it to the micro control unit; The microcontroller unit is also used to determine whether a sudden change occurs in the current voltage; if a sudden change occurs, the relay is controlled to disconnect from the power circuit, and when the duration of the disconnection reaches a fourth preset threshold, the relay is controlled to reconnect to the power circuit to continue to extract the liquid from the liquid source into the first container.

6. The automatic liquid extraction system according to claim 5, characterized in that: The fourth preset threshold is a second calculation result obtained by dividing 20% ​​of the volume of the first container by the discharge speed of the first container.

7. The automatic liquid extraction system according to any one of claims 1 to 6, characterized in that: The third preset threshold is a first calculation result obtained by dividing the volume of the first container by a first difference; wherein the first difference is a difference between a liquid inlet speed and a liquid discharge speed of the first container.

8. A method for automatically extracting liquid using the automatic liquid extraction system according to claim 1, characterized in that: The method comprises: The control circuit controls the diaphragm pump to extract the liquid from the liquid source to the first container, and transport the liquid to the second container through the first container; wherein a pressure sensor is provided at the liquid outlet pipe of the diaphragm pump; The pressure sensor detects the pressure at the liquid outlet of the liquid outlet pipe. When the pressure at the liquid outlet is not less than a preset pressure threshold, the internal switch of the diaphragm pump is controlled to be disconnected to stop extracting the liquid from the liquid source to the first container, until the pressure at the liquid outlet is less than the preset pressure threshold, and the internal switch of the diaphragm pump is controlled to be closed to continue extracting the liquid from the liquid source to the first container.

9. An analyzer, characterized in that: An automatic liquid extraction system comprising the method described in any one of claims 1 to 7.

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