Flow testing device, system and method

Abstract

The invention discloses a flow testing device and system and a flow testing method, and belongs to the technical field of ventilation treatment equipment. The flow testing device comprises a flow adjusting valve, a first pressure measuring piece, a second pressure measuring piece and a flow meter. The input end of the flow regulating valve, the first end of the first pressure measuring piece and the first end of the second pressure measuring piece are all used for being communicated with the output end of ventilation treatment equipment, the second end of the second pressure measuring piece is communicated with a target node, and the target node is located at the output end of the flow regulating valve; the output end of the flow regulating valve is detachably connected with the flow meter; the first pressure measuring piece is used for detecting the airflow pressure of the output end of the ventilation treatment equipment; and the second pressure measuring piece is used for detecting the airflow pressure between the output end of the ventilation treatment equipment and the target node. According to the invention, the accuracy of traffic testing is effectively guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of ventilation treatment devices, and particularly relates to a flow rate testing device, a system, and a flow rate testing method. Background Art

[0002] A ventilator is a ventilation treatment device used to automatically increase or provide ventilation to the human lungs and belongs to a category of medical electronics (ME) devices. As an effective means to artificially replace the autonomous ventilation function, ventilators have been widely used in respiratory failure caused by various reasons, anesthesia respiratory management during major surgeries, respiratory support treatment, and first aid resuscitation, and occupy a very important position in the field of modern medicine. Among them, the flow rate value of the ventilator is an important parameter characterizing the performance of the ventilator. The flow rate value of the ventilator refers to the speed at which the ventilator delivers gas, usually measured in liters per minute (L / min). Therefore, there is an urgent need for a flow rate detection device to calibrate the actual flow rate value of the ventilator.

[0003] In the current ventilator flow rate testing scheme, a pressure gauge and one end of a flow rate regulating valve are usually connected to one end of the ventilation pipeline of the ventilator, and a flow meter is connected to the other end of the flow rate regulating valve. The pressure of the ventilator is set to multiple test pressures in sequence, and the flow rate testing scheme at each set pressure is executed after each setting. Specifically: adjust the flow rate regulating valve so that the flow meter actually detects a reference flow rate value, and determine the pressure value detected by the pressure gauge at this time. Adjust the flow rate regulating valve again until the pressure value detected by the pressure gauge drops by a reference variable value, and determine that the pressure value detected by the pressure gauge at this time is the target pressure value, and the flow rate value detected by the flow meter is the flow rate value at this target pressure value.

[0004] However, when the set test pressure is small, especially when set to the minimum test pressure of the ventilator, due to the large air resistance of the flow meter itself. Therefore, there may be a situation where the pressure detected by the pressure gauge cannot be decreased by adjusting the flow rate valve, and thus the flow rate value corresponding to the minimum test pressure of the ventilator cannot be determined. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a flow rate testing device, a system, and a flow rate testing method, which can solve the problem that the flow rate value may not be determined when the set test pressure of the ventilator is small.

[0006] In a first aspect, the embodiments of this application provide a flow rate testing device, which includes: a flow rate regulating valve, a first pressure measuring component, a second pressure measuring component, and a flow meter;

[0007] The input end of the flow regulating valve, the first pressure measuring member, and the first ends of the second pressure measuring members are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring member communicates with the target node, and the target node is located at the output end of the flow regulating valve. The output end of the flow regulating valve is detachably connected to the flow meter;

[0008] The first pressure measuring member is used to detect the air flow pressure at the output end of the ventilation treatment device;

[0009] The second pressure measuring member is used to detect the air flow pressure between the output end of the ventilation treatment device and the target node.

[0010] In a second aspect, an embodiment of the present application provides a flow rate testing device, which includes: a flow regulating valve, a fixed air resistance, a first pressure measuring member, a second pressure measuring member, and a flow meter;

[0011] One end of the fixed air resistance is used to connect to the output end of the ventilation treatment device, the other end of the fixed air resistance is connected to the input end of the flow regulating valve, and the output end of the flow regulating valve is detachably connected to the flow meter;

[0012] The first ends of the first pressure measuring member and the second pressure measuring member are both used to communicate with the output end of the ventilation treatment device, and the second end of the second pressure measuring member communicates with the target node, and the target node is the other end of the fixed air resistance;

[0013] The first pressure measuring member is used to detect the air flow pressure at the output end of the ventilation treatment device;

[0014] The second pressure measuring member is used to detect the air flow pressure of the fixed air resistance.

[0015] In a third aspect, an embodiment of the present application provides a flow rate testing system, which includes: a ventilation treatment device, a ventilation pipeline, and the flow rate testing device according to any one of the first aspect or the second aspect. The output end of the ventilation treatment device is communicated with each component of the flow rate testing device through the ventilation pipeline.

[0016] In a fourth aspect, an embodiment of the present application provides a flow rate testing method, which is applied to the flow rate testing system according to the third aspect, and the method includes:

[0017] Connect the flow meter to the output end of the flow regulating valve, and set the pressure of the ventilation treatment device to the target test pressure;

[0018] Adjust the flow regulating valve until the flow meter detects a reference flow value, and record the first pressure value detected by the first pressure measuring member;

[0019] Disconnect the flowmeter from the output end of the flow regulating valve;

[0020] Adjust the flow regulating valve again until the first pressure measuring member detects a second pressure value, and record the third pressure value detected by the second pressure measuring member. The second pressure value drops by a reference variable value compared to the first pressure value;

[0021] Reconnect the flowmeter to the output end of the flow regulating valve;

[0022] Maintain the adjustment opening of the flow regulating valve, and adjust the pressure of the ventilation treatment device until the second pressure measuring member detects the third pressure value;

[0023] Determine that the current flow value detected by the flowmeter is the flow value of the ventilation treatment device at the target test pressure.

[0024] In a fifth aspect, an embodiment of the present application provides a flow test control device, which includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method described in the fourth aspect are implemented.

[0025] In a sixth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the fourth aspect are implemented.

[0026] In a seventh aspect, an embodiment of the present application provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the method described in the fourth aspect.

[0027] In an embodiment of the present application, the flow test device includes: a flow regulating valve, a first pressure measuring member, a second pressure measuring member, and a flowmeter. The input end of the flow regulating valve, the first ends of the first pressure measuring member and the second pressure measuring member are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring member communicates with the target node. The target node is located at the output end of the flow regulating valve, and the output end of the flow regulating valve is detachably connected to the flowmeter.

[0028] When the pressure of the ventilation treatment device is set to the target test pressure, the flow test device first connects the flowmeter to the output end of the flow regulating valve, adjusts the flow regulating valve until the flowmeter detects the reference flow value, and records the first pressure value of the air flow at the output end of the ventilation treatment device detected by the current first pressure measuring component. Then, disconnect the flowmeter from the output end of the flow regulating valve, and adjust the flow regulating valve again until the first pressure measuring component detects a second pressure value that has decreased by the reference variable value compared to the first pressure value, and record the third pressure value of the air flow between the output end of the ventilation treatment device and the target node detected by the current second pressure measuring component. Then, connect the flowmeter to the output end of the flow regulating valve again. While maintaining the adjustment opening of the flow regulating valve, adjust the pressure of the ventilation treatment device so that the second pressure measuring component detects the third pressure value, determine the flow value currently detected by the flowmeter, and obtain the flow value of the ventilation treatment device at the target test pressure.

[0029] According to Poiseuille Law, when the flow resistance of the pipeline is constant, the flow rate of the pipeline is proportional to the pressure difference between the two ends of the pipeline. It can be seen from this that if the pressure difference between the two ends of the pipeline remains unchanged, the flow rate of the pipeline remains unchanged. In the technical solution of the present application, the third pressure value detected by the second pressure measuring component can be recorded when the flowmeter is disconnected from the output end of the flow regulating valve and the first pressure measuring component detects the second pressure value, so that after reconnecting the flowmeter to the output end of the flow regulating valve, the pressure of the ventilation treatment device can be adjusted to reproduce the air flow pressure between the output end of the ventilation treatment device and the target node while maintaining the adjustment opening of the flow regulating valve unchanged, so as to reproduce the air flow pressure of the flow regulating valve when the flowmeter is disconnected from the output end of the flow regulating valve, that is, the pressure difference between the two ends of the flow regulating valve. Thus, the flow rate flowing through the flow regulating valve when the flowmeter is not connected to the flow test device is reproduced, and the output flow rate of the flow test device is detected by the flowmeter, so as to obtain the calibrated flow value of the ventilation treatment device at the target test pressure. During the process of testing the flow rate by the flow test device, by reproducing the flow rate flowing through the flow regulating valve of the ventilation treatment device when the flowmeter is not connected at the target test pressure, the flow value detected by the flowmeter can be considered as the output flow rate of the flow test device when the flowmeter is not connected. Therefore, compared with the related art, the flow test result will not be affected by the air resistance of the flowmeter itself, effectively ensuring the accuracy of the flow test. In particular, the accuracy of the flow value tested when the test pressure set by the ventilation treatment device is small. Description of the Drawings

[0030] Figure 1 is one of the structural schematic diagrams of the flow test system provided by the embodiment of the present application;

[0031] Figure 2 is the second of the structural schematic diagrams of the flow test system provided by the embodiment of the present application;

[0032] Figure 3 It is the third schematic structural diagram of the traffic test system provided by the embodiment of the present application;

[0033] Figure 4 It is the fourth schematic structural diagram of the traffic test system provided by the embodiment of the present application;

[0034] Figure 5 It is the fifth schematic structural diagram of the traffic test system provided by the embodiment of the present application;

[0035] Figure 6 It is the sixth schematic structural diagram of the traffic test system provided by the embodiment of the present application;

[0036] Figure 7 It is one of the schematic diagrams of the traffic test table provided by the embodiment of the present application;

[0037] Figure 8 It is one of the flowcharts of the traffic test method provided by the embodiment of the present application;

[0038] Figure 9 It is one of the block diagrams of the traffic test control device provided by the embodiment of the present application. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, rather than all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0040] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order different from those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0041] Next, in conjunction with the accompanying drawings, the traffic test device, system, and traffic test method provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0042] A ventilator is a ventilation treatment device used to automatically increase or provide ventilation for the human lungs and belongs to a category of ME devices. As an effective means to artificially replace the function of spontaneous ventilation, ventilators have been widely used in respiratory failure caused by various reasons, anesthesia respiratory management during major surgeries, respiratory support treatment, and first aid resuscitation, and occupy a very important position in the field of modern medicine. Among them, the two parameters of the flow value and the maximum flow value of the ventilator are important indicators to characterize the performance of the ventilator. The flow value of the ventilator refers to the speed at which the ventilator delivers gas. The maximum flow refers to the maximum speed at which the ventilator delivers gas, usually measured in L / min.

[0043] In the current ventilator flow test scheme, a pressure gauge and one end of a flow regulating valve are usually connected to one end of the ventilator's air supply pipeline, and a flow meter is connected to the other end of the flow regulating valve. The pressure of the ventilator is set to multiple test pressures in sequence, and the flow test scheme at each set pressure is executed after each setting is completed. Among them, the pressure of the ventilator refers to the air flow pressure provided to the patient by the ventilator during operation.

[0044] The specific flow test scheme is as follows: Adjust the flow regulating valve so that the flow value actually detected by the flow meter is the reference flow, and determine the pressure value detected by the pressure gauge at this time. Adjust the flow regulating valve again until the pressure value detected by the pressure gauge drops by the reference variable value, and determine that the pressure value detected by the pressure gauge at this time is the target pressure value, and the flow value detected by the flow meter is the flow value at this target pressure value. Further, repeat the flow test multiple times to obtain the average value of the flow values at the target pressure values determined by multiple tests, so as to obtain the maximum flow value at the target pressure value.

[0045] However, when the set test pressure is small, especially when it is set to the minimum test pressure of the ventilator, due to the large air resistance of the flow meter itself. Therefore, there may be a situation where the pressure detected by the pressure gauge cannot be decreased by adjusting the flow valve, making it impossible to determine the flow value corresponding to the minimum test pressure of the ventilator, and thus impossible to determine the maximum flow value of the ventilator.

[0046] Please refer to Figure 1 , which shows a schematic structural diagram of a flow test system provided by an embodiment of the present application. As Figure 1 shown, the flow test system 10 includes: a ventilation treatment device 200, an air supply pipeline, and a flow test device 100 provided by an embodiment of the present application. Among them, the output end of the ventilation treatment device 200 is connected to each component of the flow test device 100 through the air supply pipeline. The following describes the two structures of the flow test device 100 separately.

[0047] In one type of flow test device, please continue to refer to Figure 1, the flow rate testing device 100 includes: a flow rate regulating valve 101, a first pressure measuring member 102, a second pressure measuring member 103, and a flow meter 104.

[0048] Among them, the input end of the flow rate regulating valve 101 is used to communicate with the output end of the ventilation treatment device 200. The output end of the flow rate regulating valve 101 is detachably connected to the flow meter 104. The flow rate regulating valve 101 is used to regulate the size of the gas flowing to the flow meter 104. Optionally, the flow rate regulating valve 101 can be an electric valve, a pneumatic valve, an electro-hydraulic valve, a regulating piston valve, etc.

[0049] The first pressure measuring member 102 is used to communicate with the output end of the ventilation treatment device 200. The first pressure measuring member 102 is used to detect the air flow pressure at the output end of the ventilation treatment device 200. Optionally, the first pressure measuring member 102 can be a differential pressure gauge or a pressure gauge. The first end of the first pressure measuring member 102 is used to communicate with the output end of the ventilation treatment device 200. The second end of the first pressure measuring member 102 is vented.

[0050] The first end of the second pressure measuring member 103 is used to communicate with the output end of the ventilation treatment device 200. The second end of the second pressure measuring member 103 is connected to the target node A. The target node A is located at the output end of the flow rate regulating valve 101. The second pressure measuring member 103 is used to detect the air flow pressure between the output end of the ventilation treatment device 200 and the target node. Optionally, the second pressure measuring member 103 can be a differential pressure gauge or a pressure gauge.

[0051] In an optional case, as Figure 1 shown, the input end of the flow rate regulating valve 101 is used to be directly connected to the output end of the ventilation treatment device 200. The second pressure measuring member 103 is used to detect the air flow pressure of the flow rate regulating valve 101.

[0052] In another optional case, as Figure 2 shown, the flow rate testing device 100 further includes: a fixed air resistance 105. One end of the fixed air resistance 105 is used to be connected to the output end of the ventilation treatment device 200. The other end of the fixed air resistance 105 is connected to the input end of the flow rate regulating valve 101. The second pressure measuring member 103 is used to detect the air flow pressure from the fixed air resistance 105 to the flow rate regulating valve 101.

[0053] It should be noted that the number of the fixed air resistances 105 that the flow rate testing device 100 can include can be one or more. Figure 2 Taking the example that the flow rate testing device 100 includes one fixed air resistance 105 for illustration.

[0054] In the case where the flow rate testing device 100 includes a plurality of fixed air resistors 105, the plurality of fixed air resistors 105 can be connected in series end to end. One end of the connected plurality of fixed air resistors 105 is used to connect to the output end of the ventilation treatment device 200, and the other end is connected to the input end of the flow rate regulating valve 101.

[0055] For example, the flow rate testing device 100 includes a total of 3 fixed air resistors 105, namely a first fixed air resistor, a second fixed air resistor, and a third fixed air resistor. One end of the first fixed air resistor is used to connect to the output end of the ventilation treatment device 200. The other end of the first fixed air resistor is connected to one end of the second fixed air resistor. The other end of the second fixed air resistor is connected to one end of the third fixed air resistor. The other end of the third fixed air resistor is connected to the input end of the flow rate regulating valve 101.

[0056] In another flow rate testing device, please refer to Figure 3 , which shows a schematic structural diagram of another flow rate testing device provided by an embodiment of the present application. As Figure 3 shown, the flow rate testing device 100 includes: a flow rate regulating valve 101, a fixed air resistor 105, a first pressure measuring member 102, a second pressure measuring member 103, and a flow meter 104.

[0057] Among them, one end of the fixed air resistor 105 is used to connect to the output end of the ventilation treatment device 200. The other end of the fixed air resistor 105 is connected to the input end of the flow rate regulating valve 101. The output end of the flow rate regulating valve 101 is detachably connected to the flow meter 104.

[0058] The first ends of the first pressure measuring member 102 and the second pressure measuring member 103 are both used to communicate with the output end of the ventilation treatment device 200. The first pressure measuring member 102 is used to detect the air flow pressure at the output end of the ventilation treatment device 200. Optionally, the first pressure measuring member 102 can be a differential pressure gauge or a pressure gauge. The first end of the first pressure measuring member 102 is used to communicate with the output end of the ventilation treatment device 200. The second end of the first pressure measuring member 102 is vented.

[0059] The second end of the second pressure measuring member 103 is connected to the target node A. The target node A is the other end of the fixed air resistor 105. The second pressure measuring member 103 is used to detect the air flow pressure of the fixed air resistor 105. Optionally, the second pressure measuring member 103 can be a differential pressure gauge or a pressure gauge.

[0060] It should be noted that, as mentioned above, the number of fixed air resistors 105 that the flow rate testing device 100 can include can be one or more. Figure 3 Taking the case where the flow rate testing device 100 includes one fixed air resistor 105 as an example for illustration.

[0061] When the flow rate testing device 100 includes a plurality of fixed air resistances 105, the plurality of fixed air resistances 105 can be connected in series end to end. One end of the connected plurality of fixed air resistances 105 is used to connect to the output end of the ventilation treatment device 200, and the other end is connected to the input end of the flow rate regulating valve 101.

[0062] Optionally, the target node A can be the output end of any one of the plurality of fixed air resistances 105. For example, the flow rate testing device 100 includes 3 fixed air resistances 105, namely a first fixed air resistance, a second fixed air resistance, and a third fixed air resistance. One end of the first fixed air resistance is used to connect to the output end of the ventilation treatment device 200. The other end of the first fixed air resistance is connected to one end of the second fixed air resistance. The other end of the second fixed air resistance is connected to one end of the third fixed air resistance. The other end of the third fixed air resistance is connected to the input end of the flow rate regulating valve 101. The target node A can be the other end of the first fixed air resistance. Correspondingly, the second pressure measuring member 103 is used to detect the air flow pressure of the first fixed air resistance. Or, the other end of the second fixed air resistance. Correspondingly, the second pressure measuring member 103 is used to detect the air flow pressure from the first fixed air resistance to the second fixed air resistance. Or, the other end of the third fixed air resistance. Correspondingly, the second pressure measuring member 103 is used to detect the air flow pressure from the first fixed air resistance to the third fixed air resistance.

[0063] When performing a flow rate test using the flow rate testing device provided in the embodiment of the present application, connect the flow meter 104 to the output end of the flow rate regulating valve 101, and set the pressure of the ventilation treatment device 200 to the target test pressure. Adjust the flow rate regulating valve 101 until the flow meter 104 detects a reference flow rate value. Record the first pressure value detected by the first pressure measuring member 102.

[0064] Disconnect the flow meter 104 from the output end of the flow rate regulating valve 101. Adjust the flow rate regulating valve 101 again until the first pressure measuring member 102 detects a second pressure value, and record the third pressure value detected by the second pressure measuring member 103. The second pressure value drops by a reference variable value compared to the first pressure value.

[0065] Reconnect the flow meter 104 to the output end of the flow rate regulating valve 101. Maintain the adjustment opening of the flow rate regulating valve 101, and adjust the pressure of the ventilation treatment device 200 until the second pressure measuring member 103 detects the third pressure value. Determine the flow rate value detected by the flow meter 104 as the flow rate value of the ventilation treatment device 200 under the target test pressure.

[0066] Optionally, the value range of the reference flow rate value is 40 L / min ± 2 L / min, that is, [38, 42], and the unit is L / min (liters per minute). The value range of the reference variable value is 1 hPa ± 0.1 hPa (that is, 1 cmH2O ± 0.1 cmH2O), that is, [0.9, 1.1], and the unit is hPa (hectopascal).

[0067] In an alternative implementation, the number of target test pressures can be multiple. The ventilation therapy device has a pressure range. The target test pressures can be the minimum pressure, multiple intermediate pressures, and the maximum pressure within the pressure range. The intermediate pressures can be any multiple of the pressures within the pressure range of the ventilation therapy device other than the minimum pressure and the maximum pressure.

[0068] Exemplarily, the target test pressure can be the minimum pressure P min , the first intermediate pressure P mid1 , the second intermediate pressure P mid2 , the third intermediate pressure P mid3 , and the maximum pressure P max . The first intermediate pressure P mid1 is the sum of the minimum pressure P min and one - quarter of the maximum pressure difference, that is, the first intermediate pressure P mid1 is P min + 1 / 4×(P max - P min ). The maximum pressure difference refers to the difference between the maximum pressure P max and the minimum pressure P min . The second intermediate pressure P mid2 is the sum of the minimum pressure P min and one - half of the maximum pressure difference, that is, the second intermediate pressure P mid2 is P min + 1 / 2×(P max - P min ). The third intermediate pressure P mid3 is the sum of the minimum pressure P min and three - quarters of the maximum pressure difference, that is, the third intermediate pressure P mid3 is P min + 3 / 4×(P max - P min ).

[0069] In the embodiments of the present application, the output end of the ventilation therapy device 200 in the flow test system 10 is communicated with each component of the flow test device 100 through a ventilation pipeline.

[0070] Optionally, as Figure 1 shown, the patient connection port of the ventilation pipeline can be respectively communicated with the input end of the flow regulating valve 101, the first pressure measuring member 102, and the first end of the second pressure measuring member 103 through a four - way connector. Alternatively, the patient connection port of the ventilation pipeline can be respectively communicated with the input end of the flow regulating valve 101, the first pressure measuring member 102, and the first end of the second pressure measuring member 103 through two three - way connectors.

[0071] Exemplarily, the patient connection port of the ventilation pipeline can be connected to the first pressure measuring member 102 and the second three-way connector respectively through the first three-way connector. The second three-way connector is also connected to the input end of the flow regulating valve 101 and the first end of the second pressure measuring member 103 respectively. Among them, the length range of the ventilation pipeline can be 1.9m ± 0.15m, that is, [1.75, 2.05], with the unit m (meter).

[0072] It is not difficult to understand that when the flow rate testing device is Figure 2 or Figure 3 In the case of the structure shown, similar to the foregoing, the patient connection port of the ventilation pipeline can be connected to the input end of the fixed air resistance 105, the first pressure measuring member 102 and the first end of the second pressure measuring member 103 respectively through the four-way connector. Alternatively, the patient connection port of the ventilation pipeline can be connected to the input end of the fixed air resistance 105, the first pressure measuring member 102 and the first end of the second pressure measuring member 103 respectively through two three-way connectors.

[0073] In the embodiments of the present application, when performing flow rate testing using the flow rate testing device provided in the embodiments of the present application, the flow rate testing device 100 is connected to the ventilation treatment device 200, and the pressure of the ventilation treatment device 200 is sequentially set to a plurality of target test pressures. After each setting is completed, the flow rate testing device 100 is used to perform flow rate detection under the target test pressure to obtain the flow rate value of the ventilation treatment device 200 under the target test pressure, and then the flow rate value of the ventilation treatment device 200 under each target test pressure is obtained, thereby completing the flow rate testing of the ventilation treatment device 200. The following takes the pressure setting of the ventilation treatment device as the minimum test pressure, that is, the minimum pressure, as an example for illustration.

[0074] The flow rate testing device 100 is connected to the ventilation treatment device 200, and the flow rate testing system 10 enters the flow rate testing state. The flow meter 104 is connected to the output end of the flow regulating valve 101. The pressure of the ventilation treatment device 200 is set to the minimum test pressure P min . The flow regulating valve 101 is adjusted until the flow meter 104 detects the reference flow rate value. The first pressure value currently detected by the first pressure measuring member 102 is recorded.

[0075] The connection between the flow meter 104 and the output end of the flow regulating valve 101 is disconnected. The flow regulating valve 101 is adjusted again until the second pressure value is detected by the first pressure measuring member 102, and the third pressure value currently detected by the second pressure measuring member 103 is recorded. The second pressure value drops by the reference variable value compared with the first pressure value.

[0076] Reconnect the flowmeter 104 to the output end of the flow regulating valve 101. Maintain the regulating opening degree of the flow regulating valve 101, control the pressure regulation of the ventilation treatment device 200 until the second pressure measuring member 103 detects a third pressure value. Determine that the flow value currently detected by the flowmeter 104 is the flow value of the ventilation treatment device 200 at the minimum test pressure.

[0077] Among them, when the initial structure of the flow test system 10 is Figure 1 the structure shown, if the flowmeter 104 is disconnected from the output end of the flow regulating valve 101, the structure of the flow test system 10 is as Figure 4 the structure shown. Similarly, when the initial structure of the flow test system 10 is Figure 2 the structure shown, if the flowmeter 104 is disconnected from the output end of the flow regulating valve 101, the structure of the flow test system 10 is as Figure 5 the structure shown. When the initial structure of the flow test system 10 is Figure 3 the structure shown, if the flowmeter 104 is disconnected from the output end of the flow regulating valve 101, the structure of the flow test system 10 is as Figure 6 the structure shown.

[0078] In some embodiments of the present application, the flow test device can also be used to: when the flow values of the ventilation treatment device 200 at the target test pressure are determined multiple times, use the average value of the flow values determined multiple times as the maximum flow value of the ventilation treatment device 200 at the target test pressure.

[0079] Exemplarily, the flow test device 100 is connected to the ventilation treatment device 200, and the flow test system 10 enters the flow test state. The pressure of the ventilation treatment device 200 is sequentially set to multiple target test pressures, and after each setting is completed, the flow test device 100 can be used to perform multiple flow detections at the target test pressure to obtain multiple flow values of the ventilation treatment device 200 at the target test pressure, and use the average value of the flow values determined multiple times as the maximum flow value of the ventilation treatment device 200 at the target test pressure. Furthermore, the maximum flow value of the ventilation treatment device 200 at each target test pressure is obtained, and the flow test of the ventilation treatment device 200 is completed.

[0080] After the flow test of the ventilation treatment device 200 is completed, the maximum flow value of the ventilation treatment device 200 at each target test pressure can be recorded in the flow test table as Figure 7 shown to save the standard data of the ventilation treatment device 200.

[0081] As Figure 7 shown, the flow test table records values with the minimum pressure P min , the first intermediate pressure P mid1, the second intermediate pressure P mid2 , the third intermediate pressure P mid3 and the second pressure value corresponding to the target test pressure of the maximum pressure P max , that is, the pressure measured at the patient connection port, with the unit of hPa. And the maximum flow value corresponding to each second pressure value, that is, the average flow measured at the patient connection port, with the unit of L / min. Among them, the first intermediate pressure P mid1 , the second intermediate pressure P mid2 , the third intermediate pressure P mid3 can be an integer obtained by rounding calculation.

[0082] It should be noted that Figure 7 taking the target test pressures as the minimum pressure P min , the first intermediate pressure P mid1 , the second intermediate pressure P mid2 , the third intermediate pressure P mid3 and the maximum pressure P max as an example for illustration.

[0083] When performing a flow test using the flow test device provided in the embodiment of the present application, connect the flowmeter 104 to the output end of the flow regulating valve 101. Set the ventilation treatment device 200 to meet the test operation conditions, and set the pressure of the ventilation treatment device 200 to the target test pressure. Adjust the flow regulating valve 101 until the flowmeter 104 detects the reference flow value. Record the first pressure value currently detected by the first pressure measuring member 102.

[0084] Disconnect the flowmeter 104 from the output end of the flow regulating valve 101. Adjust the flow regulating valve 101 again until the first pressure measuring member 102 detects the second pressure value, and record the third pressure value detected by the second pressure measuring member 103. The second pressure value drops by the reference variable value compared to the first pressure value.

[0085] Reconnect the flowmeter 104 to the output end of the flow regulating valve 101. Maintain the adjustment opening of the flow regulating valve 101, and adjust the pressure of the ventilation treatment device 200 until the second pressure measuring member 103 detects the third pressure value. Determine that the flow value currently detected by the flowmeter 104 is the flow value of the ventilation treatment device 200 under the target test pressure and test operation conditions.

[0086] Optionally, the test operation conditions of the ventilation treatment device 200 can be various, and can be specifically set according to the test requirements. For example, the test operation conditions of the ventilation treatment device 200 can be the reference operation conditions. The reference operation conditions are: the ventilation treatment device is in the CPAP mode, and all comfort functions such as the delayed boost and humidifier are turned off.

[0087] In some embodiments of the present application, the flow testing device 100 is connected to the ventilation therapy device 200, and the flow testing system 10 enters a flow testing state. The test operating conditions of the ventilation therapy device 200 are sequentially set to multiple target test operating conditions. After each test operating condition is set, the pressure of the ventilation therapy device 200 is sequentially set to multiple target test pressures. After each pressure setting, the flow testing device 100 performs multiple flow tests under the target test operating conditions and target test pressures to obtain multiple flow values of the ventilation therapy device 200 under the target test pressures and target test operating conditions. The average of the multiple determined flow values is used as the maximum flow value of the ventilation therapy device 200 under the target test pressures and target test operating conditions. The maximum flow value of the ventilation therapy device 200 corresponding to each target test pressure under each target test operating condition is then obtained, completing the flow test of the ventilation therapy device 200.

[0088] For example, assuming that the target test operating conditions include a first operating condition and a second operating condition, and the target test pressure includes a first test pressure and a second test pressure, after completing the flow test of the ventilation therapy device, the maximum flow value of the ventilation therapy device under the first operating condition and the first test pressure, the maximum flow value of the ventilation therapy device under the first operating condition and the second test pressure, the maximum flow value of the ventilation therapy device under the second operating condition and the first test pressure, and the maximum flow value of the ventilation therapy device under the second operating condition and the second test pressure can be obtained.

[0089] The following uses the test operating conditions of the ventilation therapy device as reference operating conditions and the pressure of the ventilation therapy device is set to the minimum test pressure, i.e., the minimum pressure, as an example to illustrate the flow test process of the ventilation therapy device using the flow test device.

[0090] In step S011 , the flow rate testing device 100 is connected to the ventilation treatment device 200 , and the flow rate testing system 10 enters a flow rate testing state. The flow meter 104 is connected to the output end of the flow rate regulating valve 101 .

[0091] Step S012: Set the pressure of the ventilation treatment device 200 to the minimum test pressure P min , set the ventilation therapy equipment to CPAP mode, turn off all comfort functions such as delayed pressure increase and humidifier, and start ventilation.

[0092] Step S013: Adjust the flow control valve 101 until the flow meter 104 detects a reference flow value. Record the first pressure value currently detected by the first pressure measuring member 102.

[0093] Step S014 , disconnecting the flow meter 104 from the output end of the flow regulating valve 101 .

[0094] Step S015: Adjust the flow regulating valve 101 again until the first pressure measuring member 102 detects a second pressure value, and record the third pressure value currently detected by the second pressure measuring member 103. The second pressure value drops by a reference variable value compared to the first pressure value.

[0095] Step S016: Reconnect the flowmeter 104 to the output end of the flow regulating valve 101.

[0096] Step S017: Maintain the adjusted opening degree of the flow regulating valve 101, and adjust the pressure of the ventilation treatment device 200 until the second pressure measuring member 103 detects the third pressure value.

[0097] Step S018: Determine that the flow value currently detected by the flowmeter 104 is the flow value of the ventilation treatment device 200 under the minimum test pressure.

[0098] Repeat step S012 ten times to set the pressure of the ventilation treatment device 200 to the minimum test pressure P min , until step S018 determines that the flow value currently detected by the flowmeter 104 is the flow value of the ventilation treatment device 200 under the minimum test pressure, so as to obtain ten flow values of the ventilation treatment device 200 detected by the flowmeter 104 under the minimum test pressure;

[0099] Determine the average value of the ten flow values as the maximum flow value of the ventilation treatment device 200 under the minimum test pressure P min below.

[0100] It should be noted that in some embodiments, the method of disconnecting and reconnecting the flowmeter 104 from the output end of the flow regulating valve 101 may be as follows: the flow test device outputs a first warning message through the controller, so that after receiving the first warning message, the tester manually installs the flowmeter 104 at the output end of the flow regulating valve 101 to connect the flowmeter 104 and the flow regulating valve 101. Similarly, the controller can output a second warning message so that after receiving the second warning message, the tester manually disassembles the flowmeter 104 to disconnect the flowmeter 104 and the flow regulating valve 101.

[0101] Alternatively, the flow test device 100 may further include a switch member, and the switch member is respectively connected to the flowmeter 104 and the flow regulating valve 101. The method of disconnecting and reconnecting the flowmeter 104 from the output end of the flow regulating valve 101 may be as follows: the flow test device controls the switch member to open through the controller to connect the output end of the flowmeter 104 and the flow regulating valve 101; the controller controls the switch member to close to disconnect the output end of the flowmeter 104 and the flow regulating valve 101.

[0102] In summary, the flow rate testing device provided by the embodiment of the present application includes: a flow rate regulating valve, a first pressure measuring member, a second pressure measuring member, and a flow meter. The input end of the flow rate regulating valve, the first ends of the first pressure measuring member and the second pressure measuring member are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring member communicates with the target node. The target node is located at the output end of the flow rate regulating valve, and the output end of the flow rate regulating valve is detachably connected to the flow meter.

[0103] Alternatively, the flow rate testing device provided by the embodiment of the present application includes: a flow rate regulating valve, a fixed air resistance, a first pressure measuring member, a second pressure measuring member, and a flow meter. One end of the fixed air resistance is used to connect to the output end of the ventilation treatment device, and the other end of the fixed air resistance is connected to the input end of the flow rate regulating valve. The output end of the flow rate regulating valve is detachably connected to the flow meter. The first ends of the first pressure measuring member and the second pressure measuring member are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring member communicates with the target node, and the target node is the other end of the fixed air resistance.

[0104] When the pressure of the ventilation treatment device is set to the target test pressure, the flow rate testing device first connects the flow meter to the output end of the flow rate regulating valve, adjusts the flow rate regulating valve until the flow meter detects a reference flow rate value, and records the first pressure value of the air flow at the output end of the ventilation treatment device detected by the current first pressure measuring member. Then, disconnect the flow meter from the output end of the flow rate regulating valve, and adjust the flow rate regulating valve again until the first pressure measuring member detects a second pressure value that has decreased by a reference variable value compared to the first pressure value, and record the third pressure value of the air flow between the output end of the ventilation treatment device and the target node detected by the current second pressure measuring member. Then, connect the flow meter to the output end of the flow rate regulating valve again. While maintaining the adjustment opening of the flow rate regulating valve, by adjusting the pressure of the ventilation treatment device, make the second pressure measuring member detect the third pressure value, determine the flow rate value currently detected by the flow meter, and obtain the flow rate value of the ventilation treatment device at the target test pressure.

[0105] According to Poiseuille Law, when the flow resistance of a pipeline is constant, the flow rate of the pipeline is proportional to the pressure difference across both ends of the pipeline. Thus, it can be known that if the pressure difference across both ends of the pipeline remains unchanged, the flow rate of the pipeline remains unchanged. In the technical solution of the present application, when the flowmeter is disconnected from the output end of the flow regulating valve and the first pressure measuring component detects the second pressure value, the third pressure value detected by the second pressure measuring component can be recorded, so that after reconnecting the flowmeter to the output end of the flow regulating valve, by adjusting the pressure of the ventilation treatment device, while keeping the adjustment opening of the flow regulating valve unchanged, the air flow pressure between the output end of the ventilation treatment device and the target node can be reproduced, so as to reproduce the air flow pressure of the flow regulating valve when the flowmeter is disconnected from the output end of the flow regulating valve, that is, the pressure difference across both ends of the flow regulating valve. Thus, the flow rate flowing through the flow regulating valve when the flowmeter is not connected to the flow testing device can be reproduced, and the flowmeter is used to detect the output flow rate of the flow testing device, so as to obtain the calibrated flow rate value of the ventilation treatment device under the target test pressure. During the process of testing the flow rate by the flow testing device, by reproducing the flow rate flowing through the flow regulating valve of the ventilation treatment device when the flowmeter is not connected under the target test pressure, the flow rate value detected by the flowmeter can be considered as the output flow rate of the flow testing device when the flowmeter is not connected. Therefore, compared with the related art, the flow test result will not be affected by the air resistance of the flowmeter itself, effectively ensuring the accuracy of the flow test. In particular, the accuracy of the flow rate value tested when the test pressure set by the ventilation treatment device is relatively small.

[0106] Moreover, the flow test system can achieve the same technical effect as the flow test device. To avoid repetition, it will not be elaborated here.

[0107] Please refer to Figure 8 , which shows a flowchart of a flow test method provided by an embodiment of the present application. The flow test method is applied to the flow test system provided by an embodiment of the present application. Optionally, the flow test method can be executed by a control component. As Figure 8 shown, the flow test method includes:

[0108] Step 801: Connect the flowmeter to the output end of the flow regulating valve and set the pressure of the ventilation treatment device to the target test pressure.

[0109] Step 802: Adjust the flow regulating valve until the flowmeter detects the reference flow rate value, and record the first pressure value detected by the first pressure measuring component.

[0110] Step 803: Disconnect the flowmeter from the output end of the flow regulating valve.

[0111] Step 804: Adjust the flow regulating valve again until the first pressure measuring component detects the second pressure value, and record the third pressure value detected by the second pressure measuring component. The second pressure value drops by the reference variable value compared with the first pressure value.

[0112] Step 805: Reconnect the flowmeter to the output end of the flow regulating valve.

[0113] Step 806: Maintain the adjusted opening of the flow regulating valve, and adjust the pressure of the ventilation treatment device until the second pressure measuring component detects a third pressure value.

[0114] Step 807: Determine that the flow value currently detected by the flowmeter is the flow value of the ventilation treatment device under the target test pressure.

[0115] The explanations and implementation manners of each step can refer to the relevant introductions on the device side described above, and the embodiments of the present application will not elaborate on this.

[0116] Optionally, the flow rate testing method further includes: in the case of determining the flow rate value of the ventilation treatment device under the target test pressure multiple times, taking the average value of the flow rate values determined multiple times as the maximum flow rate value of the ventilation treatment device under the target test pressure.

[0117] Optionally, the process of setting the pressure of the ventilation treatment device to the target test pressure includes: setting the ventilation treatment device to meet the test operation conditions, and setting the pressure of the ventilation treatment device to the target test pressure.

[0118] Correspondingly, the process of determining that the flow value currently detected by the flowmeter is the flow value of the ventilation treatment device under the target test pressure includes: determining that the flow value currently detected by the flowmeter is the flow value of the ventilation treatment device under the target test pressure and the test operation conditions.

[0119] Exemplarily, when performing flow rate testing using the flow rate testing system provided by the embodiments of the present application, connect the flowmeter to the output end of the flow regulating valve, set the ventilation treatment device to meet the test operation conditions, and set the pressure of the ventilation treatment device to the target test pressure.

[0120] Adjust the flow regulating valve until the flowmeter detects a reference flow value, and record the first pressure value detected by the first pressure measuring component.

[0121] Disconnect the flowmeter from the output end of the flow regulating valve. Adjust the flow regulating valve again until the first pressure measuring component detects a second pressure value, and record the third pressure value detected by the second pressure measuring component. The second pressure value drops by a reference variable value compared with the first pressure value.

[0122] Reconnect the flowmeter to the output end of the flow regulating valve. Maintain the adjusted opening of the flow regulating valve, and adjust the pressure of the ventilation treatment device until the second pressure measuring component detects a third pressure value. Determine that the flow value detected by the flowmeter is the flow value of the ventilation treatment device under the target test pressure and the test operation conditions.

[0123] In summary, the flow rate testing method provided by the embodiments of the present application is applied to a flow rate testing system including a flow rate testing device, a ventilation treatment device, and a ventilation pipeline. Among them, the flow rate testing device includes: a flow rate regulating valve, a first pressure measuring component, a second pressure measuring component, and a flow meter. The input end of the flow rate regulating valve, the first ends of the first pressure measuring component and the second pressure measuring component are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring component communicates with the target node, and the target node is located on the output side of the first structural component communicating with the output end of the ventilation treatment device and on the input side of the flow meter. The output end of the flow rate regulating valve is detachably connected to the flow meter.

[0124] During the process of using the flow rate testing device to test the flow rate, first connect the flow meter of the flow rate testing device to the output end of the flow rate regulating valve, adjust the flow rate regulating valve until the flow meter detects a reference flow rate value, and record the first pressure value of the air flow at the output end of the ventilation treatment device detected by the current first pressure measuring component. Then, disconnect the flow meter from the output end of the flow rate regulating valve, and adjust the flow rate regulating valve again until the first pressure measuring component detects a second pressure value that has decreased by a reference variable value compared to the first pressure value, and record the third pressure value of the air flow between the output end of the ventilation treatment device and the target node detected by the current second pressure measuring component. Then, connect the flow meter to the output end of the flow rate regulating valve again. While maintaining the adjustment opening of the flow rate regulating valve, by adjusting the pressure of the ventilation treatment device, make the second pressure measuring component detect the third pressure value, determine the flow rate value currently detected by the flow meter, and obtain the flow rate value of the ventilation treatment device under the target test pressure.

[0125] The flow rate testing device provided by the embodiments of the present application includes: a flow rate regulating valve, a first pressure measuring component, a second pressure measuring component, and a flow meter. The input end of the flow rate regulating valve, the first ends of the first pressure measuring component and the second pressure measuring component are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring component communicates with the target node. The target node is located at the output end of the flow rate regulating valve, and the output end of the flow rate regulating valve is detachably connected to the flow meter.

[0126] Alternatively, the flow rate testing device provided by the embodiments of the present application includes: a flow rate regulating valve, a fixed air resistance, a first pressure measuring component, a second pressure measuring component, and a flow meter. One end of the fixed air resistance is used to connect to the output end of the ventilation treatment device, and the other end of the fixed air resistance is connected to the input end of the flow rate regulating valve. The output end of the flow rate regulating valve is detachably connected to the flow meter. The first ends of the first pressure measuring component and the second pressure measuring component are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring component communicates with the target node, and the target node is the other end of the fixed air resistance.

[0127] According to Poiseuille Law, when the flow resistance of a pipeline is constant, the flow rate of the pipeline is proportional to the pressure difference between the two ends of the pipeline. It can be seen from this that if the pressure difference between the two ends of the pipeline remains unchanged, the flow rate of the pipeline remains unchanged. In the technical solution of the present application, the third pressure value detected by the second pressure measuring member can be recorded when the flowmeter is disconnected from the output end of the flow regulating valve and the second pressure value is detected by the first pressure measuring member, so that after reconnecting the flowmeter to the output end of the flow regulating valve, by adjusting the pressure of the ventilation treatment device, while keeping the adjustment opening of the flow regulating valve unchanged, the air flow pressure between the output end of the ventilation treatment device and the target node is reproduced, so as to reproduce the air flow pressure of the flow regulating valve when the flowmeter is disconnected from the output end of the flow regulating valve, that is, the pressure difference between the two ends of the flow regulating valve. Thus, the flow rate flowing through the flow regulating valve when the flow test device is not connected to the flowmeter is reproduced, and the output flow rate of the flow test device is detected by the flowmeter to obtain the calibrated flow rate value of the ventilation treatment device under the target test pressure. During the process of testing the flow rate by the flow test device, by reproducing the flow rate flowing through the flow regulating valve of the ventilation treatment device when not connected to the flowmeter under the target test pressure, the flow rate value detected by the flowmeter can be considered as the output flow rate of the flow test device when not connected to the flowmeter. Therefore, compared with the related art, the flow test result will not be affected by the air resistance of the flowmeter itself, effectively ensuring the accuracy of the flow test. In particular, the accuracy of the flow rate value tested when the test pressure set by the ventilation treatment device is small.

[0128] Optionally, as Figure 9 shown, an embodiment of the present application further provides a flow test control device 900, including a processor 901, a memory 902, a program or instruction stored on the memory 902 and executable on the processor 901. When the program or instruction is executed by the processor 901, the above-mentioned flow test method is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be elaborated here.

[0129] An embodiment of the present application further provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned flow test method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be elaborated here.

[0130] Wherein, the processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disc, etc.

[0131] Another embodiment of the present application provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is configured to run programs or instructions to implement each process of the above embodiment of the traffic test method and can achieve the same technical effects. To avoid repetition, details are not described herein again.

[0132] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip.

[0133] It should be noted that in this document, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0134] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions for causing a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present application.

[0135] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A flow rate testing device, characterized in that, The flow rate testing device includes: a flow rate regulating valve, a first pressure measuring member, a second pressure measuring member, and a flow meter; The input end of the flow rate regulating valve, the first ends of the first pressure measuring member and the second pressure measuring member are all used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring member communicates with the target node, and the target node is located at the output end of the flow rate regulating valve. The output end of the flow rate regulating valve is detachably connected to the flow meter; The first pressure measuring member is used to detect the air flow pressure at the output end of the ventilation treatment device; The second pressure measuring member is used to detect the air flow pressure between the output end of the ventilation treatment device and the target node.

2. The device according to claim 1, characterized in that The input end of the flow rate regulating valve is used to be directly connected to the output end of the ventilation treatment device, and the second pressure measuring member is used to detect the air flow pressure of the flow rate regulating valve.

3. The device according to claim 1, characterized in that, The flow rate testing device further includes: a fixed air resistance; One end of the fixed air resistance is used to be connected to the output end of the ventilation treatment device, the other end of the fixed air resistance is connected to the input end of the flow rate regulating valve, and the second pressure measuring member is used to detect the air flow pressure from the fixed air resistance to the flow rate regulating valve.

4. The device according to any one of claims 1 to 3, characterized in that, Both the first pressure measuring member and the second pressure measuring member are differential pressure gauges. The first end of the first pressure measuring member is used to communicate with the output end of the ventilation treatment device, and the second end of the first pressure gauge is vented.

5. A flow rate testing device, characterized in that, The flow rate testing device includes: a flow rate regulating valve, a fixed air resistance, a first pressure measuring member, a second pressure measuring member, and a flow meter; One end of the fixed air resistance is used to be connected to the output end of the ventilation treatment device, the other end of the fixed air resistance is connected to the input end of the flow rate regulating valve, and the output end of the flow rate regulating valve is detachably connected to the flow meter; The first ends of the first pressure measuring member and the second pressure measuring member are both used to communicate with the output end of the ventilation treatment device. The second end of the second pressure measuring member communicates with the target node, and the target node is the other end of the fixed air resistance; The first pressure measuring member is used to detect the air flow pressure at the output end of the ventilation treatment device; The second pressure measuring member is used to detect the air flow pressure of the fixed air resistance.

6. A flow rate testing system, characterized in that, The flow rate testing system includes: a ventilation treatment device, a ventilation pipeline, and the flow rate testing device according to any one of claims 1 to 5, The output end of the ventilation treatment device is communicated with each component of the flow rate testing device through the ventilation pipeline.

7. A flow test method, characterized in that, Applied to the flow rate testing system according to claim 6, the method includes: Connect the flow meter to the output end of the flow rate regulating valve, and set the pressure of the ventilation treatment device to the target test pressure; Adjust the flow rate regulating valve until the flow meter detects the reference flow rate value, and record the first pressure value detected by the first pressure measuring member; Disconnect the flow meter from the output end of the flow rate regulating valve; Adjust the flow rate regulating valve again until the first pressure measuring member detects the second pressure value, and record the third pressure value detected by the second pressure measuring member. The second pressure value drops by the reference variable value compared with the first pressure value; Reconnect the flow meter to the output end of the flow rate regulating valve; Maintain the adjustment opening of the flow regulating valve and adjust the pressure of the ventilation treatment device until the third pressure value is detected by the second pressure measuring member; Determine that the flow value currently detected by the flow meter is the flow value of the ventilation treatment device at the target test pressure.

8. The method according to claim 7, wherein The method further includes: In the case of determining the flow value of the ventilation treatment device at the target test pressure multiple times, use the average value of the flow values determined multiple times as the flow value of the ventilation treatment device at the target test pressure.

9. The method according to claim 7, wherein Setting the pressure of the ventilation treatment device to the target test pressure includes: setting the ventilation treatment device to meet the test operation conditions and setting the pressure of the ventilation treatment device to the target test pressure; Determining that the flow value currently detected by the flow meter is the flow value of the ventilation treatment device at the target test pressure includes: determining that the flow value currently detected by the flow meter is the flow value of the ventilation treatment device under the target test pressure and the test operation conditions.

10. The method according to any one of claims 7 to 9, characterized in that The reference flow value is 40 L / min ± 2 L / min, and the reference variable value is 1 hPa ± 0.1 hPa.

11. The method according to any one of claims 7 to 9, characterized in that The target test pressure is the minimum pressure of the ventilation treatment device.

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