A detection device and detection method for detecting the flow rate of a pump pipe

Abstract

The present invention relates to a detection device and a detection method for detecting the flow rate of a pump tube pipeline, which includes a chassis. A constant-temperature liquid storage device is arranged inside the chassis, and a control cabinet and a detection assembly are installed on the chassis. The detection assembly includes a liquid inlet pipe, a liquid return pipe installed on the chassis, and a power pump capable of allowing liquid to enter the liquid inlet pipe. One end of the liquid return pipe and the liquid inlet pipe is located outside the chassis respectively, and the other ends of the liquid return pipe and the liquid inlet pipe are respectively communicated with the constant-temperature liquid storage device. A flow meter is communicated with the liquid inlet pipe; A pipe squeezing mechanism capable of squeezing and releasing the liquid inlet pipe is installed inside the chassis. A pressure detection sensor is also communicated with the liquid inlet pipe. Both the pressure detection sensor and the flow meter are located on the side of the pipe squeezing mechanism away from the constant-temperature liquid storage device. The control cabinet is electrically connected to the pipe squeezing mechanism, the power pump, the flow meter, and the pressure detection sensor respectively; The present invention can respectively perform standardized detection on the flow rate of the pump tube pipeline under normal pressure state and pressurized state, so as to facilitate the detection of whether the pump tube is a qualified product.

Description

Technical Field

[0001] The present invention belongs to the technical field of detection equipment, and in particular relates to a detection device and a detection method for detecting the flow rate of a pump pipe line. Background Art

[0002] The extracorporeal circulation circuit of the blood purification device is an extracorporeal circulation circuit used in conjunction with the hemodialyzer, hemodiafiltration device, and hemoperfusion device during hemodialysis, hemodiafiltration, and other treatments. It consists of an arterial circuit, a venous circuit, a replacement fluid tube, and other necessary accessories. When in use, it shall be used for hemodialysis patients in accordance with the "Standard Operating Procedures for Blood Purification."

[0003] The flow rate detection of the pump tube in the extracorporeal circulation circuit is one of the important performance indicators of the extracorporeal circulation circuit of the blood purification system. It can reflect the smoothness of the extracorporeal circulation of the hemodialysis circuit, the blood flow rate and the fatigue characteristics of the pump tube at the maximum service life. It is also an important indicator for the quality detection of the extracorporeal circulation circuit. However, according to the national standard YY0267-2016 for the extracorporeal circulation circuit of hemodialysis and related therapeutic blood purification devices, there is currently no dedicated detection equipment to detect the flow rate of the pump tube. That is, it is currently inconvenient to detect whether the pump tube is a qualified product, which will affect production efficiency and quality. Therefore, there are still shortcomings and deficiencies in the existing technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a detection device and a detection method for detecting the flow rate of a pump pipe line, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A detection device for detecting the flow rate of a pump pipe line, comprising a chassis with a cavity structure, a constant temperature liquid storage device disposed within the chassis, and a control cabinet and a detection assembly mounted on the chassis. The detection assembly comprises a liquid inlet pipe, a liquid return pipe, and a power pump capable of filling the liquid inlet pipe with liquid, each of the liquid return pipe and the liquid inlet pipe having one end located outside the chassis, and the other end of each of the liquid return pipe and the liquid inlet pipe being in communication with the constant temperature liquid storage device. A flow meter is connected to the liquid inlet pipe.

[0007] A tube squeezing mechanism capable of squeezing and releasing the liquid inlet pipe is installed in the chassis. The liquid inlet pipe is also connected to a pressure detection sensor. The pressure detection sensor and flow meter are both located on a side of the tube squeezing mechanism away from the constant temperature liquid storage device. The control cabinet is electrically connected to the tube squeezing mechanism, the power pump, the flow meter, and the pressure detection sensor respectively.

[0008] The power pump is a peristaltic pump, and the pump body of the peristaltic pump is located outside the machine case and is equipped with a detachable pump cover.

[0009] Furthermore, a partition board is installed inside the machine case. The tube squeezing mechanism includes a mounting seat installed on the partition board. One side of the mounting seat is equipped with a linear driving mechanism electrically connected to the control cabinet. On the other side of the mounting seat, a first tube clamping groove penetrating through the mounting seat is provided, and a sliding groove communicating with the first tube clamping groove is provided on the mounting seat to form an inverted T-shaped groove. A slider capable of moving in the sliding groove is installed on the linear driving mechanism, and the tube body of the liquid inlet pipe penetrates through the mounting seat through the first tube clamping groove.

[0010] Furthermore, the linear driving mechanism is a lead screw transmission mechanism. A position sensing piece is installed on the side of the slider away from the first tube clamping groove, and the side of the position sensing piece away from the slider is located outside the sliding groove. A position sensor opposite to the position of the position sensing piece is installed on the mounting seat, and the position sensor is electrically connected to the control cabinet.

[0011] Furthermore, the control cabinet is electrically connected to a display screen embedded in the machine case.

[0012] Furthermore, fixed rods are installed outside the machine case below the liquid inlet pipe and the liquid return pipe, and second tube clamping grooves are provided at the ends of the fixed rods away from the machine case.

[0013] Furthermore, the number of the detection assemblies is multiple groups.

[0014] Furthermore, the constant temperature liquid storage device is a constant temperature water bath.

[0015] Furthermore, a temperature and humidity sensor is installed outside the machine case, and the temperature and humidity sensor is electrically connected to the control cabinet.

[0016] Furthermore, the detection method of the above detection device for detecting the flow rate of the pump tube pipeline includes the following steps:

[0017] Step 1: Debug the equipment and prepare for detection;

[0018] Step 2: Install the pump tube and connect the pump tube to the liquid inlet pipe and the liquid return pipe;

[0019] Step 3: Automatically calculate the actual flow rate of the pump tube under normal pressure as L1;

[0020] Step 4: Automatically calculate the relative deviation of the flow rate under normal pressure δ1. When δ1 does not exceed 10%, continue the detection process. Otherwise, the pump tube is a defective product and the detection process ends;

[0021] Step 5: When δ1 does not exceed 10%, the tube squeezing mechanism squeezes the liquid inlet pipe, and the liquid inlet pipe switches from the normal pressure state to the pressurized state;

[0022] Step 6: Automatically calculate the actual flow rate of the pump tube under the pressurized state as L2;

[0023] Step 7: Automatically calculate the relative flow rate deviation δ2 under pressure. When δ2 does not exceed 10%, the pump tube is a qualified product; otherwise, the pump tube is a defective product.

[0024] Furthermore, Step 1: Before use, set the detection program in the control cabinet in advance. When in use, set the operating flow rate of the power pump as L0 in the control cabinet, and fill the constant-temperature liquid storage device with test water at 37°C;

[0025] Step 2: After removing the pump cover, install the pump tube to be detected on the pump body of the peristaltic pump, and connect the two ends of the pump tube to the liquid inlet pipe and the liquid return pipe respectively;

[0026] Step 3: Start the power pump. The test water in the constant-temperature liquid storage device circulates through the liquid inlet pipe, the pump tube, and the liquid return pipe. After running for a period of time, the control cabinet automatically reads the flow rate values on the flow meter multiple times per unit time, takes the average value, and calculates the actual flow rate of the pump tube under the atmospheric pressure state as L1;

[0027] Step 4: According to the calculation formula set in the control cabinet:

[0028] δ1 = |(L0 - L1) / L0| × 100%,

[0029] Calculate the relative flow rate deviation δ1 under the atmospheric pressure. When δ1 does not exceed 10%, the pump tube is a qualified product, and continue the detection process; otherwise, the pump tube is a defective product, end the detection process, and the control cabinet reminds whether the pump tube is qualified;

[0030] Step 5: When δ1 does not exceed 10%, the control cabinet automatically starts the tube squeezing mechanism to squeeze the liquid inlet pipe. After the tube squeezing mechanism runs in place, stop the operation and maintain the squeezing state, so that the pressure at the liquid inlet of the liquid inlet pipe changes and increases to a certain range. Then, the liquid inlet pipe switches from the atmospheric pressure state to the pressurized state. After running for a period of time, when the pressure in the pipeline does not reach the pressure value set in the control cabinet or continues to fluctuate all the time, the control cabinet judges that the pump tube is a defective product according to the pressure value signal transmitted by the pressure detection sensor, and ends the detection process;

[0031] Step 6: When the pressure in the pipeline is constant, the control cabinet automatically reads the flow rate values on the flow meter multiple times per unit time, takes the average value, and calculates the actual flow rate of the pump tube under the pressurized state as L2;

[0032] Step 7: According to the calculation formula set in the control cabinet:

[0033] δ2 = |(L1 - L2) / L1| × 100%,

[0034] Calculate the relative flow deviation δ2 under pressure. When δ2 does not exceed 10%, the pump tube is a qualified product; otherwise, it is a defective product, and the control cabinet will remind whether the pump tube is qualified or not.

[0035] Step 8: After the flow rate detection of the pump tube pipeline under the pressurized state is completed, regardless of whether the pump tube is qualified or not, the tube extrusion mechanism returns to the initial state, the power pump stops running, then the pump cover is removed, and after the pump tube is taken off, the detection ends. Next, start from Step 2 to detect the flow rate of the next pump tube pipeline.

[0036] Adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0037] The present invention is an automated detection device developed according to the detection methods and standards of the flow rate of the pump tube pipeline stipulated in the national standards. When in use, it can respectively conduct standardized detections on the flow rate of the pump tube pipeline under the normal pressure state and the pressurized state, so as to detect whether the pump tube is a qualified product, thereby improving production efficiency and quality. Description of the Drawings

[0038] Figure 1 is one of the structural schematic diagrams of the present invention;

[0039] Figure 2 is another structural schematic diagram of the present invention;

[0040] Figure 3 is the internal structural schematic diagram of the present invention;

[0041] Figure 4 is Figure 3 the structural schematic diagram of some devices in

[0042] Figure 5 is Figure 1 the enlarged partial structural schematic diagram of part A in

[0043] Figure 6 is the third structural schematic diagram of the present invention;

[0044] Figure 7 is the structural schematic diagram of the present invention in the use state;

[0045] Figure 8 is Figure 7 the enlarged partial structural schematic diagram of part B in

[0046] Reference numerals: 1, power pump; 2, liquid inlet pipe; 3, liquid return pipe; 4, pipe extrusion mechanism; 41, mounting seat; 42, linear drive mechanism; 421, bracket; 422, drive motor; 43, first pipe clamping groove; 44, chute; 45, slider; 46, in-place induction piece; 47, in-place sensor; 5, flowmeter; 6, pressure detection sensor; 7, chassis; 71, cabinet door; 72, heat dissipation holes; 8, constant temperature liquid storage device; 9, control cabinet; 10, pump pipe; 11, support plate; 12, partition board; 13, display screen; 14, fixing rod; 15, second pipe clamping groove; 16, temperature and humidity sensor; 17, universal wheel; 18, heat dissipation fan; 19, branch pipe. Detailed implementation manners

[0047] To make the objectives, technical solutions and beneficial effects of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0048] As Figures 1 to 8 shown, the present invention provides a detection device for detecting the flow rate of a pump pipe pipeline, including a chassis 7 having a cavity structure. A constant temperature liquid storage device 8 is arranged inside the chassis 7, and the constant temperature liquid storage device 8 is located at the bottom inside the chassis 7. During use, the constant temperature liquid storage device 8 contains test water at 37°C as the test liquid, and the constant temperature liquid storage device 8 can ensure that the test water is always at 37°C; a control cabinet 9 and a detection assembly are installed on the chassis 7. The control cabinet 9 is a PLC controller and has functions such as storing data; the detection assembly includes a liquid inlet pipe 2, a liquid return pipe 3 installed on the chassis 7, and a power pump 1 capable of feeding liquid into the liquid inlet pipe 2. One end of the liquid return pipe 3 and the liquid inlet pipe 2 is located outside the chassis 7 respectively, and the other ends of the liquid return pipe 3 and the liquid inlet pipe 2 are respectively communicated with the constant temperature liquid storage device 8. Specifically, joints are respectively communicated at the ends of the liquid return pipe 3 and the liquid inlet pipe 2 located outside the chassis 7. In this way, during use, it is convenient to connect the two ends of the pump pipe 10 with the liquid return pipe 3 and the liquid inlet pipe 2; when the two ends of the pump pipe 10 are respectively connected with the liquid inlet pipe 2 and the liquid return pipe 3, after starting the power pump 1, the test water in the constant temperature liquid storage device 8 can circulate through the liquid inlet pipe 2, the pump pipe 10 and the liquid return pipe 3; in addition, a pipeline fixing frame can be arranged inside the chassis 7 to respectively fix the positions of the liquid return pipe 3 and the liquid inlet pipe 2, so as to sort out the pipelines of the liquid return pipe 3 and the liquid inlet pipe 2 and prevent the pipelines from being folded.

[0049] A flowmeter 5 is connected to the liquid inlet pipe 2. Both the flowmeter 5 and the control cabinet 9 are installed in the chassis 7 through the support plates 11 arranged in the chassis 7. Specifically, the flowmeter 5 can be set as a high-precision ultrasonic flowmeter to ensure the accuracy of the measured flow value. The instantaneous flow rate and the cumulative flow rate per unit time in the pipeline can be measured by the flowmeter 5. At this time, the liquid inlet pipe 2 is in an atmospheric pressure state. Before use, a detection program can be set in the control cabinet 9, and the detection program includes the relevant parameters of each component. Then, when in use, first set the operating flow rate of the power pump 1 in the control cabinet 9 to L0, and then insert the two ends of the pump pipe 10 to be detected into the ends of the liquid inlet pipe 2 and the liquid return pipe 3 outside the chassis 7 respectively, and connect the two ends of the pump pipe 10 to the liquid inlet pipe 2 and the liquid return pipe 3 respectively. Then, when the power pump 1 is started, the test water in the constant temperature liquid storage device 8 can circulate through the liquid inlet pipe 2, the pump pipe 10 and the liquid return pipe 3. After running for a period of time, the control cabinet 9 automatically reads the flow value on the flowmeter 5 per unit time multiple times, such as three times, and takes the average value to calculate the actual flow rate of the pump pipe 10 in the atmospheric pressure state as L1. And the control cabinet 9 calculates the relative flow deviation δ1 of the pump pipe 10 in the atmospheric pressure state according to the previously set detection program: δ1 = |(L0 - L1) / L0|×100%, and compares it with the standard value set in the national standard: when δ1 does not exceed 10%, the pump pipe 10 is a qualified product, to judge whether the pipeline flow rate of the pump pipe 10 in the atmospheric pressure state is qualified, so as to judge whether the pump pipe 10 is a qualified product. If the pump pipe 10 is unqualified, the detection ends.

[0050] When the flow rate of the pump pipe 10 in the atmospheric pressure state is qualified, continue to the next stage of the detection process. Specifically, a pipe squeezing mechanism 4 capable of squeezing and releasing the liquid inlet pipe 2 is installed in the chassis 7. Specifically, in the initial state, the pipe squeezing mechanism 4 does not squeeze the liquid inlet pipe 2. At this time, the liquid inlet pipe 2 is in an atmospheric pressure state. When the pipe squeezing mechanism 4 runs in place and squeezes the liquid inlet pipe 2, the pressure in the pipeline of the liquid inlet pipe 2 can be changed, switching from the atmospheric pressure state to the pressurized state. A pressure detection sensor 6 is also connected to the liquid inlet pipe 2 through a branch pipe 19. When the test water flows in the liquid inlet pipe 2, the pressure detection sensor 6 can measure the pressure in the pipeline of the liquid inlet pipe 2. Both the pressure detection sensor 6 and the flowmeter 5 are located on the side of the pipe squeezing mechanism 4 away from the constant temperature liquid storage device 8. When in use, the liquid inlet pipe 2 passes through the pipe squeezing mechanism 4 and the flowmeter 5 in sequence and is connected to the pressure detection sensor 6 through the branch pipe 19, and the end of the liquid inlet pipe 2 away from the constant temperature liquid storage device 8 is located outside the chassis 7 after passing through the chassis 7. The control cabinet 9 is electrically connected to the pipe squeezing mechanism 4, the power pump 1, the flowmeter 5 and the pressure detection sensor 6 respectively to realize automatic detection.

[0051] Specifically, when the flow rate of the pump tube 10 is qualified under normal pressure, the control cabinet 9 automatically starts the tube squeezing mechanism 4 to squeeze the liquid inlet tube 2. When the tube squeezing mechanism 4 runs in place, it stops working and maintains the squeezing state, so that the liquid inlet tube 2 is switched from the normal pressure state to the pressurized state. After running for a period of time, for example, the running time can be set to 10 minutes. When the pressure in the pipeline does not reach the pressure value set in the control cabinet 9: 33.3 kPa or continues to fluctuate continuously, the control cabinet 9 judges that the pump tube 10 is a defective product according to the pressure value signal transmitted by the pressure detection sensor 6, and ends the detection process.

[0052] When the pressure in the pipeline is constant, the control cabinet 9 automatically reads the flow rate value on the flow meter 5 per unit time multiple times, for example, three times, and takes the average value to calculate the actual flow rate L2 of the pump tube 10 under the pressurized state. And the control cabinet 9 can calculate the relative flow rate deviation δ2 of the pump tube 10 under the pressurized state according to the previously set detection program: δ2 = |(L1 - L2) / L1|×100%, and compare it with the standard value set in the national standard: when δ2 does not exceed 10%, the pump tube 10 is a qualified product, to judge whether the pipeline flow rate of the pump tube 10 under the pressurized state is qualified, so as to judge whether the pump tube 10 is a qualified product. At this time, whether the pump tube 10 is qualified or not, the tube squeezing mechanism 4 returns to the initial state, the power pump 1 stops running, and then the pump cover is removed and the pump tube 10 is taken off to complete the whole set of detection processes.

[0053] Generally speaking, the present invention is an automatic detection device developed according to the detection method and standard of the pipeline flow rate of the pump tube specified in the national standard YY0267-2016. When in use, it can respectively perform standardized detection on the flow rate of the pump tube 10 pipeline under normal pressure and pressurized state, so as to detect whether the pump tube 10 is a qualified product, thereby improving production efficiency and quality; that is, the present invention is a detection device dedicated to the detection of the pipeline flow rate of the pump tube and can be automatically detected, which has certain application reference significance for the detection of the pipeline flow rate of the pump tube.

[0054] Further, as Figure 7 shown in Figure 8 the figure, the power pump 1 is a peristaltic pump. The pump body of the peristaltic pump is located outside the chassis 7 and is equipped with a detachable pump cover. Specifically, the pump body of the peristaltic pump, the end of the liquid inlet tube 2 far away from the constant temperature liquid storage device 8, and the end of the liquid return tube 3 far away from the constant temperature liquid storage device 8 can be arranged on the same side outside the chassis 7; and the peristaltic pump is a peristaltic pump in the prior art. When in use, after the pump cover is removed, the pump tube 10 to be detected can be installed on the pump body of the peristaltic pump. That is, the structure of the existing peristaltic pump itself can be used as a carrier for carrying the pump tube 10. At the same time, after starting the peristaltic pump, the peristaltic pump squeezes the pump tube 10 cyclically, so that the test water can circulate through the liquid inlet tube 2, the pump tube 10 and the liquid return tube 3, which is more convenient for detection.

[0055] The specific setting method of the tube extrusion mechanism 4 is as follows: As Figure 3 , Figure 4 shown in Figure 6 , a partition 12 is installed in the chassis 7, and the constant temperature liquid storage device 8 is located in the chassis 7 below the partition 12; the tube extrusion mechanism 4 includes a mounting seat 41 installed on the partition 12. One side of the mounting seat 41 is installed with a linear drive mechanism 42 electrically connected to the control cabinet 9. On the other side of the mounting seat 41, a first tube clamping groove 43 penetrating the mounting seat 41 is provided, and a sliding groove 44 communicating with the first tube clamping groove 43 is provided on the mounting seat 41 to form an inverted T-shaped groove. A slider 45 capable of moving in the sliding groove 44 is installed on the linear drive mechanism 42. The tube body of the liquid inlet pipe 2 passes through the mounting seat 41 through the first tube clamping groove 43. Specifically, the first tube clamping groove 43 is a U-shaped groove, and the U-shaped opening of the first tube clamping groove 43 is flush with the edge of the mounting seat 41, so that the liquid inlet pipe 2 can be clamped on the mounting seat 41 through the first tube clamping groove 43, facilitating the liquid inlet pipe 2 to penetrate the mounting seat 41; when in use, the linear drive mechanism 42 can drive the slider 45 to move in the sliding groove 44. When the slider 45 moves to abut against the liquid inlet pipe 2 in the first tube clamping groove 43 and moves in place, the pressure at the liquid inlet of the liquid inlet pipe 2 can be changed and gradually increased to a certain range. For example, when the pressure is increased to 33.3 kPa, i.e., 250 mmHg, the liquid inlet pipe 2 is switched from the atmospheric pressure state to the pressurized state.

[0056] The specific setting method of the linear drive mechanism 42 is as follows: The linear drive mechanism 42 is a lead screw transmission mechanism. Specifically, the linear drive mechanism 42 includes a bracket 421 installed on the mounting seat 41. A lead screw parallel to the sliding groove 44 is rotatably connected inside the bracket 421. A drive motor 422 installed on the bracket 421 is drivingly connected to the lead screw. The drive motor 422 is electrically connected to the control cabinet 9. The slider 45 is sleeved on one end of the lead screw close to the first tube clamping groove 43. One side of the slider 45 close to the first tube clamping groove 43 is located in the sliding groove 44 and is slidably connected to the mounting seat 41. For example, guide grooves parallel to the sliding groove 44 can be provided on two opposite groove walls of the sliding groove 44, and guide blocks located in the guide grooves and slidably connected to the guide grooves can be fixedly connected to both sides of the slider 45 to realize the sliding connection between the slider 45 and the mounting seat 41; when in use, the drive motor 422 can drive the lead screw to rotate, and during the rotation of the lead screw, the slider 45 can be moved along the sliding groove 44 to squeeze the liquid inlet pipe 2 in the first tube clamping groove 43.

[0057] In addition, to facilitate the detection of whether the slider 45 is in place when pressing the liquid inlet pipe 2, a position-inducing sheet 46 is installed on the side of the slider 45 away from the first pipe clamping groove 43. The side of the position-inducing sheet 46 away from the slider 45 is located outside the sliding groove 44, that is, the sliding groove 44 is a U-shaped groove, and the U-shaped opening of the sliding groove 44 is flush with the edge of the mounting seat 41; a position sensor 47 opposite to the position of the position-inducing sheet 46 is installed on the mounting seat 41, and the position sensor 47 is electrically connected to the control cabinet 9. Specifically, during use, when the position sensor 47 senses the position-inducing sheet 46, the slider 45 is in place, and then the control cabinet 9 can automatically control the driving motor 422 to stop running, so that the pipe squeezing mechanism 4 maintains the squeezing state of the liquid inlet pipe 2.

[0058] Further, as Figure 1 shown in Figure 7 the control cabinet 9 is electrically connected to a display screen 13 embedded in the chassis 7. Specifically, the display screen 13 can be set as a touch screen. During use, relevant parameters of each component can be set through the display screen 13, and the operating parameters of each component can be displayed in real time on the display screen 13, as well as the prompt information indicating whether the pump pipe 10 is finally a qualified product.

[0059] Further, as Figure 1 shown in Figure 5 and Figure 7 outside the chassis 7 below the liquid inlet pipe 2 and the liquid return pipe 3, fixing rods 14 are installed. Second pipe clamping grooves 15 are provided at the ends of the fixing rods 14 away from the chassis 7. Specifically, the second pipe clamping grooves 15 are U-shaped grooves, and the U-shaped openings of the second pipe clamping grooves 15 are flush with the ends of the fixing rods 14 away from the chassis 7, so that the pipe body of the pump pipe 10 can be easily clamped on the fixing rods 14 through the second pipe clamping grooves 15; during use, after the two ends of the pump pipe 10 are respectively clamped on the fixing rods 14, they can be connected to the liquid inlet pipe 2 and the liquid return pipe 3, so as to sort out the pipeline of the pump pipe 10 and prevent the pump pipe 10 from being folded.

[0060] Further, as Figure 1 shown in Figure 3 and Figure 6 and Figure 7 the number of the detection assemblies is multiple groups, for example, it can be set to two groups, and the two groups of detection assemblies can be symmetrically distributed on both sides of the chassis 7. During use, the pipeline flow rates of multiple pump pipes 10 can be detected simultaneously to improve the detection efficiency.

[0061] Further, the constant temperature liquid storage device 8 is a constant temperature water bath, so as to facilitate ensuring that the test water is always at 37 °C to ensure the accuracy of the detection results.

[0062] Further, as Figure 2 shown in Figure 3 and Figure 6 andFigure 7 As shown in the figure, a temperature and humidity sensor 16 is installed outside the chassis 7. The temperature and humidity sensor 16 is electrically connected to the control cabinet 9. Specifically, the temperature and humidity sensor 16 is used to detect the temperature and humidity in the surrounding environment to ensure that during the process of detecting the pipeline flow rate of the pump tube 10, it conforms to the temperature and humidity of the pump tube during the blood purification operation, which can improve the accuracy of detection; and the temperature and humidity in the surrounding environment can be adjusted by existing equipment such as air conditioners and humidifiers.

[0063] Further, as Figure 2 shown in Figure 3 the figure, one side of the chassis 7 is provided with an opening, and an openable door 71 is installed on the opening side of the chassis 7. Specifically, when the door 71 is opened, it is convenient to maintain and repair the components inside the chassis 7; in addition, it is also convenient to regularly replace the test water in the constant temperature liquid storage device 8; in addition, a plurality of heat dissipation holes 72 and heat dissipation fans 18 are provided on the chassis 7 to ensure the air circulation and heat dissipation inside the chassis 7.

[0064] Further, as Figures 1 to 3 shown in Figure 6 and Figure 7 the figure, universal wheels 17 with a self-locking function are installed at the four corners of the outer bottom surface of the chassis 7. By setting the universal wheels 17, it is convenient to move the entire detection device, and after moving in place, the position of the chassis 7 can be fixed through the self-locking function of the universal wheels 17, which is convenient for use.

[0065] Further, the detection method of the above detection device for detecting the pipeline flow rate of the pump tube includes the following steps:

[0066] Step 1: Debug the equipment and prepare for detection;

[0067] Step 2: Install the pump tube 10 and connect the pump tube 10 to the liquid inlet pipe 2 and the liquid return pipe 3;

[0068] Step 3: Automatically calculate the actual flow rate of the pump tube 10 under normal pressure as L1;

[0069] Step 4: Automatically calculate the relative deviation of the flow rate under normal pressure δ1. When δ1 does not exceed 10%, continue the detection process. Otherwise, the pump tube 10 is a defective product, and the detection process ends;

[0070] Step 5: When δ1 does not exceed 10%, the tube squeezing mechanism 4 squeezes the liquid inlet pipe 2, and the liquid inlet pipe 2 switches from the normal pressure state to the pressurized state;

[0071] Step 6: Automatically calculate the actual flow rate of the pump tube 10 under the pressurized state as L2;

[0072] Step 7: Automatically calculate the relative deviation of the flow rate under pressure δ2. When δ2 does not exceed 10%, the pump tube 10 is a qualified product. Otherwise, the pump tube 10 is a defective product.

[0073] Further, Step 1: Before use, preset the detection program in the control cabinet 9. The detection program includes the relevant parameters of each component. When in use, first set the operating flow rate of the power pump 1 in the control cabinet 9 to L0, and fill the constant temperature liquid storage device 8 with test water at 37°C.

[0074] Step 2: After removing the pump cover, install the pump tube 10 to be detected on the pump body of the peristaltic pump, and connect the two ends of the pump tube 10 to the liquid inlet pipe 2 and the liquid return pipe 3 respectively.

[0075] Step 3: Start the power pump 1. The test water in the constant temperature liquid storage device 8 circulates through the liquid inlet pipe 2, the pump tube 10 and the liquid return pipe 3. After running for a period of time, the control cabinet 9 automatically reads the flow rate values on the flow meter 5 per unit time multiple times, such as three times, and takes the average value to calculate the actual flow rate of the pump tube 10 under normal pressure as L1.

[0076] Step 4: According to the calculation formula set in the control cabinet 9:

[0077] δ1 = |(L0 - L1) / L0| × 100%,

[0078] Calculate the relative flow rate deviation δ1 under normal pressure. According to the national standard, when δ1 does not exceed 10%, the pump tube 10 is a qualified product, and continue the detection process. Otherwise, the pump tube 10 is a defective product, end the detection process, and the control cabinet 9 reminds whether the pump tube 10 is qualified. At this time, if the pump tube 10 is unqualified, after removing the pump tube 10, start from Step 2 next time to detect the flow rate of the next pump tube 10 pipeline.

[0079] Step 5: When δ1 does not exceed 10%, the control cabinet 9 automatically starts the tube squeezing mechanism 4 to squeeze the liquid inlet pipe 2. When the tube squeezing mechanism 4 runs in place, stop the operation and maintain the squeezing state, so that the pressure at the liquid inlet of the liquid inlet pipe 2 changes and gradually increases to a certain range. For example, when the pressure increases to 33.3 kPa, that is, 250 mmHg, the liquid inlet pipe 2 switches from the normal pressure state to the pressurized state. After running for a period of time, for example, the running time can be set to 10 min. When the pressure in the pipeline does not reach the pressure value set in the control cabinet 9 or continues to fluctuate all the time, the control cabinet 9 judges that the pump tube 10 is a defective product according to the pressure value signal transmitted by the pressure detection sensor 6, and ends the detection process. At this time, the tube squeezing mechanism 4 resets. After removing the pump tube 10, start from Step 2 next time to detect the flow rate of the next pump tube 10 pipeline.

[0080] Step 6: When the pressure in the pipeline is constant, the control cabinet 9 automatically reads the flow rate values on the flow meter 5 per unit time multiple times, such as three times, and takes the average value to calculate the actual flow rate of the pump tube 10 under the pressurized state as L2.

[0081] Step Seven: According to the calculation formula set in the control cabinet 9:

[0082] δ2 = |(L1 - L2) / L1| × 100%,

[0083] calculate the relative flow deviation δ2 under pressure, and judge according to the national standard: when δ2 does not exceed 10%, the pump tube 10 is a qualified product, otherwise it is a defective product, and the control cabinet 9 reminds whether the pump tube 10 is qualified;

[0084] Step Eight: After the flow rate detection of the pump tube 10 pipeline under the pressurized state is completed, regardless of whether the pump tube 10 is qualified or not, the tube extrusion mechanism 4 returns to the initial state, the power pump 1 stops running, then the pump cover is removed, and after the pump tube 10 is taken off, the detection ends, and the next time it starts from Step Two to detect the flow rate of the next pump tube 10 pipeline.

[0085] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection method for a detection device for detecting the flow rate of a pump pipe, characterized in that: The steps include: Step 1: Debug the detection device and prepare for the test; the detection device includes a chassis with a cavity structure, a constant temperature liquid storage device is provided in the chassis, and a control cabinet and a detection assembly are installed on the chassis. The detection assembly includes a liquid inlet pipe, a liquid return pipe and a power pump capable of filling the liquid inlet pipe with liquid, one end of the liquid return pipe and the liquid inlet pipe are respectively located outside the chassis, and the other ends of the liquid return pipe and the liquid inlet pipe are respectively connected to the constant temperature liquid storage device, and the liquid inlet pipe is connected to a flow meter; A tube squeezing mechanism capable of squeezing and releasing the liquid inlet tube is installed in the chassis. The liquid inlet tube is also connected to a pressure detection sensor. The pressure detection sensor and flow meter are both located on a side of the tube squeezing mechanism away from the constant temperature liquid storage device. The control cabinet is electrically connected to the tube squeezing mechanism, the power pump, the flow meter, and the pressure detection sensor respectively. During use, the operating flow rate of the power pump is set to L0 in the control cabinet. Step 2: Install the pump tube and connect it to the liquid inlet pipe and liquid return pipe; Step 3: Automatically calculate the actual flow rate of the pump tube under normal pressure as L1; Step 4: According to the calculation formula set in the control cabinet: δ1=|(L0-L1) / L0|×100%, Automatically calculate the relative deviation δ1 of flow rate under normal pressure. When δ1 does not exceed 10%, the detection process continues. Otherwise, the pump tube is defective and the detection process ends. The control cabinet will remind you whether the pump tube is qualified. Step 5: When δ1 does not exceed 10%, the tube squeezing mechanism squeezes the liquid inlet tube, and the liquid inlet tube switches from a normal pressure state to a pressurized state; Step 6: Automatically calculate the actual flow rate of the pump tube under pressurized state as L2; Step 7: According to the calculation formula set in the control cabinet: δ2=|(L1-L2) / L1|×100%, Calculate the relative deviation of flow rate under pressure δ2. When δ2 does not exceed 10%, the pump tube is qualified. Otherwise, the pump tube is defective. The control cabinet will remind you whether the pump tube is qualified.

2. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 1, characterized in that: The power pump is a peristaltic pump, the pump body of the peristaltic pump is located outside the chassis and is installed with a detachable pump cover; Step 1: Before use, set the test program in the control cabinet and fill the constant temperature liquid storage device with 37°C test water; Step 2: After removing the pump cover, install the pump tube to be tested on the pump body of the peristaltic pump, and connect the two ends of the pump tube to the liquid inlet pipe and the liquid return pipe respectively; Step 3: Start the power pump, and the test water in the constant temperature liquid storage device circulates through the liquid inlet pipe, pump pipe and return pipe. After running for a period of time, the control cabinet automatically reads the flow value on the flow meter per unit time multiple times, and takes the average value to calculate the actual flow rate of the pump pipe under normal pressure as L1; Step 5: When δ1 does not exceed 10%, the control cabinet automatically starts the tube extrusion mechanism to extrude the liquid inlet pipe. After the tube extrusion mechanism runs in place, it stops working and maintains the extrusion state, causing the pressure at the liquid inlet of the liquid inlet pipe to change and gradually increase to a certain range. Then, the liquid inlet pipe switches from the atmospheric pressure state to the pressurized state. After running for a period of time, when the pressure in the pipeline does not reach the pressure value set in the control cabinet or continues to fluctuate continuously, the control cabinet judges that the pump tube is defective according to the pressure value signal transmitted by the pressure detection sensor, and ends the detection process; Step 6: When the pressure in the pipeline is constant, the control cabinet automatically reads the flow rate values on the flow meter multiple times per unit time and takes the average value to calculate the actual flow rate L2 of the pump tube in the pressurized state; Step 8: After the flow rate detection of the pump tube pipeline in the pressurized state is completed, regardless of whether the pump tube is qualified or not, the tube extrusion mechanism returns to the initial state, the power pump stops running, then the pump cover is removed, and after the pump tube is taken off, the detection ends. Next, start from Step 2 to detect the flow rate of the next pump tube pipeline.

3. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 1 or 2, characterized in that: A partition is installed inside the chassis. The tube extrusion mechanism includes a mounting seat installed on the partition. One side of the mounting seat is installed with a linear drive mechanism electrically connected to the control cabinet. The other side of the mounting seat is provided with a first tube clamping groove penetrating through the mounting seat, and a sliding groove communicating with the first tube clamping groove is formed on the mounting seat to form an inverted T-shaped groove. A slider capable of moving in the sliding groove is installed on the linear drive mechanism, and the tube body of the liquid inlet pipe passes through the mounting seat through the first tube clamping groove.

4. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 3, characterized in that: The linear drive mechanism is a lead screw transmission mechanism. A position sensing piece is installed on the side of the slider away from the first tube clamping groove. The side of the position sensing piece away from the slider is located outside the sliding groove. A position sensor opposite to the position of the position sensing piece is installed on the mounting seat, and the position sensor is electrically connected to the control cabinet.

5. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 1 or 2, characterized in that: The control cabinet is electrically connected to a display screen embedded in the chassis.

6. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 1 or 2, characterized in that: Fixed rods are installed outside the chassis below the liquid inlet pipe and the liquid return pipe. Second tube clamping grooves are provided at the ends of the fixed rods away from the chassis.

7. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 1 or 2, characterized in that: The number of the detection assemblies is multiple groups.

8. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 1 or 2, characterized in that: The constant temperature liquid storage device is a constant temperature water bath.

9. The detection method of a detection device for detecting the flow rate of a pump tube pipeline according to claim 1 or 2, characterized in that: A temperature and humidity sensor is installed outside the chassis, and the temperature and humidity sensor is electrically connected to the control cabinet.

10. A detection device for detecting the flow rate of a pump tube pipeline, characterized in that: It includes the detection device for detecting the flow rate of the pump tube pipeline used in the detection method according to any one of claims 1-9.

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