CN111044236A - Air tightness detection system and method for humidification water box of respiratory support equipment - Google Patents
Air tightness detection system and method for humidification water box of respiratory support equipment Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3209—Details, e.g. container closure devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3254—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a flow detector
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Abstract
The invention relates to an air tightness detection system and method for a humidification water box of a respiratory support device. An air-tightness detection system of a humidification water box of a respiratory support device, comprising: a standard gas source device, a controller and a gas outlet flowmeter; the air outlet of the standard air source device is hermetically communicated with the air inlet of the humidifying water box; the air outlet flowmeter is communicated with an air outlet of the humidifying water box; and the controller is respectively connected with the standard gas source device and the gas outlet flowmeter. The method is simple to operate, and the air tightness qualification of the humidifying water box can be automatically detected only by connecting the air inlet of the humidifying water box with the standard air source and connecting the air outlet of the humidifying water box with the flowmeter during detection; when the air tightness of the humidifying water box is detected to be unqualified, the alarm information is automatically sent out, the detection reliability is improved, the unqualified humidifying water box is ensured not to flow to the next production link, and the quality problem of the whole machine caused by the unqualified air tightness of the humidifying water box is avoided.
Description
Technical Field
The invention relates to air tightness detection of a humidification water box of a respiratory support device, in particular to an air tightness detection system and method of the humidification water box of the respiratory support device.
Background
At present, more than about 1 hundred million patients with chronic obstructive pulmonary disease in China exist, and positive pressure ventilation equipment serving as an auxiliary means is widely applied to treatment of chronic obstructive pulmonary disease. In order to improve the comfort of the user, the positive pressure ventilation device generally utilizes a humidifying water box to heat and humidify the air, and the air with certain temperature and humidity is output to a user interface to treat the user. As a main component of the positive pressure ventilation equipment, the quality of the humidified water box directly affects the treatment effect of the respirator. The existing humidification water box airtightness qualification is detected in a manual visual inspection mode, and an effective and high-reliability detection method and system for the airtightness qualification are lacked.
Patent No. ZL 201620987320.5 discloses a noninvasive ventilator leak monitoring device. The main air passage between the blower and the humidifier of the noninvasive ventilator is communicated through a signal acquisition element, the signal acquisition element is further connected with a control module through a bypass air passage, and the control module is used for acquiring bypass air flow output by the signal acquisition element and further monitoring the pressure of the main air passage. The utility model discloses can accurately monitor the gas leakage of breathing machine, realize sensitively triggering and removing and trade, detect out treatment parameters such as the less gas leakage of error, tidal volume and minute air output. But the data that need detect is more, and the identification process is comparatively complicated, and detection efficiency is low, and it mainly to the gas leakage detection of whole device, does not have pertinence.
Therefore, the existing air tightness detection of the humidifying water box has defects and needs to be improved.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a system and a method for detecting the air tightness of a humidification water box of a respiratory support device, which can realize automatic detection of the air tightness qualification of the humidification water box, accurately find the problem of air leakage of the humidification water box, reduce the manual operation time, improve the detection reliability, ensure that the flow of the humidification water box with unqualified air tightness cannot flow to the next link, and improve the product quality of the whole machine.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air-tightness detection system of a humidification water box of a respiratory support device, comprising: a standard gas source device, a controller and a gas outlet flowmeter; the air outlet of the standard air source device is hermetically communicated with the air inlet of the humidifying water box; the air outlet flowmeter is communicated with an air outlet of the humidifying water box; and the controller is respectively connected with the standard gas source device and the gas outlet flowmeter.
Preferably, the controller is provided with a setting unit for setting the volume of the humidifying water box and the volume of the pipeline into the controller.
Preferably, the air tightness detection system of the humidification water box of the respiratory support equipment further comprises an alarm device connected with the controller.
A method for detecting the air tightness of a humidification water box of a respiratory support device by using the detection system comprises the following steps:
s1, connecting an air inlet of the humidifying water box with an air outlet of the standard air source device, wherein the standard air source device outputs airflow to the humidifying water box according to a set flow instruction of the controller within a preset time;
s2, detecting a detection flow value of the air outlet of the humidifying water box by the air outlet flow meter according to a detection instruction of the controller and transmitting the detection flow value to the controller;
s3, the controller obtains a flow difference value according to the set flow and the detected flow value;
s4, judging whether the flow difference value is smaller than or equal to a standard threshold value, if so, determining that the humidifying water box is qualified; if not, the humidifying water box is unqualified.
Preferably, the set flow instruction comprises a plurality of flow set values and the predetermined time.
Preferably, in the step S1, the predetermined time is obtained by summing a plurality of divided times respectively obtained for the plurality of flow setting values, and the set flow instruction includes the divided time for the standard air source device to operate at each flow setting value.
Preferably, the time for the divided time is obtained according to the formula (1); the formula (1) is:
wherein, TFDThe divided time is set; vHIs the volume of the humidifying water box; vGIs the line volume; l isSThe set flow value is obtained; k is a radical of1Is a constant greater than 1.
Preferably, in the method for detecting the airtightness of the humidification water box of the respiratory support device, in step S2, the detection instruction includes a plurality of detection times, and the detection is performed at a single flow rate at the detection time point.
Preferably, the detection time is calculated by a formula (2); the formula (2) is:
wherein, TJCThe predetermined time is the preset time; vHIs the volume of the humidifying water box; vGIs the line volume; l isSThe set flow value is obtained; k is a radical of2Is greater than 1 and less than k1Is constant.
Preferably, in the method for detecting the airtightness of the humidification water box of the respiratory support device, the standard threshold is obtained by the controller according to the matching of the flow set value and a standard threshold table.
Compared with the prior art, the air tightness detection system and method for the humidifying water box of the respiratory support equipment, provided by the invention, are simple to operate, and the automatic detection of the air tightness qualification of the humidifying water box can be realized only by connecting the air inlet of the humidifying water box with the standard air source and connecting the air outlet of the humidifying water box with the flowmeter during detection; when the air tightness of the humidifying water box is detected to be unqualified, the alarm information is automatically sent out, the detection reliability is improved, the unqualified humidifying water box is ensured not to flow to the next production link, and the quality problem of the whole machine caused by the unqualified air tightness of the humidifying water box is avoided.
Drawings
FIG. 1 is a block diagram of the air tightness detecting system of the humidified water box according to the present invention;
FIG. 2 is a flow chart of the method for detecting the air tightness of the humidified water box provided by the present invention;
FIG. 3 is a graph of the set flow rate and the divided time in example 2 of the present invention;
FIG. 4 is a graph of the set flow rate and the detection time according to example 2 of the present invention;
fig. 5 is a graph of the detection order and the detected flow rate value of two tests in example 2 provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The invention provides an air tightness detection system of a humidification water box of a respiratory support device, which comprises: the device comprises a standard gas source device 1, a controller 2 and a gas outlet flowmeter 3; the air outlet of the standard air source device 1 is hermetically communicated with the air inlet of the humidifying water box; the air outlet flowmeter 3 is communicated with an air outlet of the humidifying water box; and the controller 2 is respectively connected with the standard gas source device 1 and the gas outlet flowmeter 3. The standard gas source device 1 is a device capable of sending out a gas flow corresponding to a standard according to a requirement, the corresponding standard includes a flow rate of the gas flow, and the like, as long as the required gas flow can be sent out according to an instruction of the controller 2, for example, a gas compressor and the like, and the invention is not limited; the gas outlet flowmeter 3 is a flowmeter commonly used in the field of gas flow measurement, the invention is not limited, and the preferred scheme is that the measurement precision of the gas outlet flowmeter 3 is more than 0.01L/Min; the controller 2 may be a general-purpose processor (MCU (micro controller Unit) or CPU (central processing Unit)) in the field, and the present invention is not particularly limited, and the preferred place isThe processor chip is an MCU of the type LPC1788 of the Stand-up company. The controller 2 is connected with the standard air source device 1 through electric signals in a mode including but not limited to I2C, communication line connection, SPI communication line connection, UART serial port line connection and the like; the controller 2 is connected to the outlet flow meter 3 by electrical signals including, but not limited to, I2C communication line connection, SPI communication line connection, UART serial port line connection and the like.
Correspondingly, the application also provides an air tightness detection method of the humidifying water box of the respiratory support equipment of the detection system, which comprises the following steps:
s1, connecting an air inlet of the humidified water box with an air outlet of the standard air source device 1, wherein the standard air source device 1 outputs airflow to the humidified water box according to a set flow instruction of the controller 2 within a preset time;
s2, the air outlet flow meter 3 detects the detection flow value of the air outlet of the humidifying water box according to the detection instruction of the controller 2 and transmits the detection flow value to the controller 2;
s3, the controller 2 obtains a flow difference value according to the set flow and the detected flow value;
s4, judging whether the flow difference value is smaller than or equal to a standard threshold value, if so, determining that the humidifying water box is qualified; if not, the humidifying water box is unqualified.
Specifically, the respiratory support device is preferably a positive pressure ventilation device, the humidified water box is a humidified water box required by the positive pressure ventilation device, and the air tightness detection system of the respiratory support device comprises a controller 2, a standard air source device 1 and the air outlet flow meter 3.
One end of the controller 2 is connected with the standard gas source device 1 and is used for sending a control command to the standard gas source device 1 and controlling the standard gas source device 1 to output gas according to the set flow instruction; the other end of the controller 2 is connected with the air outlet flowmeter 3 and is used for sending a detection instruction to the air outlet flowmeter 3 and receiving a flow signal from the air outlet flowmeter 3; one end of the standard gas source device 1 is connected with the controller 2 and is used for receiving a control signal sent by the controller 2, outputting gas with a certain flow and keeping the gas for a certain time; the other end of the standard gas source device 1 is connected with a gas inlet of the humidifying water box and is used for outputting gas to the humidifying water box; the air inlet of the humidifying water box is connected with the standard air source device 1 and is used for inputting the air of the standard air source; the gas outlet of the humidifying water box is connected with the gas outlet flowmeter 3 and used for outputting gas to the flowmeter; the air inlet of the air outlet flowmeter 3 is connected with the air outlet of the humidifying water box and used for receiving the air output by the humidifying water box; the gas outlet of the gas outlet flowmeter 3 is directly output to the atmosphere and used for discharging gas; the air outlet flowmeter 3 is also connected with the controller 2 and used for receiving a detection instruction sent by the controller 2, detecting the air flow output by the humidifying water box and sending a flow signal to the controller 2. The controller 2 is also used for judging whether the flow difference value is larger than the standard threshold value, if so, the excessive air flow is lost, and the air tightness of the humidifying water box is unqualified; if not, the air tightness of the humidifying water box is not qualified.
The setting of the standard threshold needs to be implemented specifically according to the field situation, is not limited specifically, and is generally between 1 and 5.
Preferably, in this embodiment, the controller 2 has a setting unit for setting the volume of the humidified water box and the volume of the pipeline to the controller 2. It should be noted that, when the pipes between the humidified water box and the device have a certain space or volume, and the detection is performed by the air flows with different flow rates, different times are required for measuring the stable detected flow value at the air outlet of the humidified water box, so that the volume of the humidified water box to be detected and the volume of the pipes to be used need to be input into the controller 2 before the measurement is started, and the controller 2 calculates the theoretical time (i.e. the time when the air flows fill the spaces theoretically), and further calculates the predetermined time.
Preferably, in this embodiment, the set flow instruction includes a plurality of flow set values and the predetermined time. Specifically, if the time is saved, the set flow instruction may include only one flow set value; if the detection accuracy is better, the set flow rate command may include two or more flow rate set values, and the more the set flow rate command, the higher the accuracy.
Preferably, in this embodiment, in the step S1, the predetermined time is obtained by summing up a plurality of divided times obtained for the plurality of flow rate set values, respectively, and the set flow rate command includes the divided time for the standard air source device 1 to operate at each flow rate set value.
As a preferable scheme, in this embodiment, the divided time is obtained according to formula (1); the formula (1) is:
wherein, TFDThe divided time is set; vHIs the volume of the humidifying water box; vGIs the line volume; l isSThe set flow value is obtained; k is a radical of1Is a constant greater than 1.
Specifically, the divided time is a constant k1Multiplied by the theoretical time to obtain the constant k1The purpose of being greater than 1 is to enable the outlet flow meter 3 to detect a stable reading of the flow, i.e., the detected flow value, within the allotted time for each flow at the set flow value as the output flow.
Preferably, in this embodiment, in step S2, the detection instruction includes a plurality of detection times, and the single flow rate is detected at the detection time.
Preferably, in this embodiment, the detection time is calculated by formula (2); the formula (2) is:
wherein, TJCThe predetermined time is the preset time; vHIs the volume of the humidifying water box; vGIs the line volume; l isSIs a stand forThe set flow value; k is a radical of2Is greater than 1 and less than k1Is constant.
The number of the detection time is equal to the number of the set flow value, and the time at which the air flow with the current set flow value as the output flow is best detected, which cannot be too early and which cannot be later than the divided time are recorded respectively, so that the constant k2Is greater than 1 and less than k1Is constant. However, the detection time is single, that is, only one divided time is standardized, but normally, the number of the divided time is more than one, and in this case, the detection time points in the predetermined time period need to be calculated in combination with the divided time, for example, the number of the divided time is 3, that is, 5s, 4s, and 3s, and the detection time points of three detections are 4s, 3s, and 2s, that is, 4s, (5+3) s, and (5+4+2) s.
Preferably, in this embodiment, the standard threshold is obtained by the controller 2 according to the flow rate set value matching a standard threshold table. Specifically, the standard threshold table includes a plurality of set flow values and corresponding standard thresholds, which are obtained for field implementation requirements, and the invention is not limited.
Preferably, the present embodiment further includes an alarm device (not shown) connected to the controller 2. When the actual flow signal detected by the air outlet flowmeter 3, namely the difference value between the detected flow value and the set flow exceeds the standard threshold value, an audible and visual alarm is sent out, the unqualified air tightness of the water box is automatically prompted, and the detection reliability is improved.
Example 2
With the volume of the humidifying water box being 1.5L and the volume of the pipeline being 0.5L, the set flow instruction output by the controller 2 always comprises: 20. 40, 60, 80, 100, 120 and 150, units: L/Min; constant k of holding coefficient11.5, constant of sampling coefficient k2The theoretical time, the divided time and the detection time at different flow rates can be calculated according to the formula 1 and the formula 2, and specific calculation results are shown in the following table.
| flow/L/ |
20 | 40 | 60 | 80 | 100 | 120 | 150 |
| Theoretical time/ |
6 | 3 | 2 | 1.5 | 1.2 | 1 | 0.8 |
| The divided time/s | 9 | 4.5 | 3 | 2.25 | 1.8 | 1.5 | 1.2 |
| Detection time/s | 7.8 | 3.9 | 2.6 | 1.95 | 1.56 | 1.3 | 1.04 |
| Order of |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
Please refer to fig. 3 and 4, in combination with the above data, taking the flow rate of 60L/Min as an example, it can be seen that the holding time is 3 s; the end of 60L/min is automatically detected from the beginning, the time is 9+4.5+ 3-16.5 s, the sampling time is 9+4.5+ 2.6-16.1 s, and the 3 rd sampling is obtained.
Please refer to fig. 5, after the test is performed under the above conditions, the test results of the two tests are obtained, wherein the curve with the maximum data exceeding 140 is curve 1, and the other curve with the maximum value lower than 140 is curve 2, which is the sampling times-flow curve of 2 humidification water boxes respectively. Wherein the curve 1 is the sampling frequency-flow curve of the humidification water box with qualified air tightness, and the curve 2 is the sampling frequency-flow curve of the humidification water box with unqualified air tightness. The flow difference value obtained after the detection between the two and the standard threshold value table are synthesized into the following table:
| flow/L/ |
20 | 40 | 60 | 80 | 100 | 120 | 150 |
| |
2 | 3 | 3 | 4 | 4 | 5 | 5 |
| Good difference of air tightness | 0.4 | 2.5 | 0.9 | 3.8 | 3.2 | 3.4 | 3.6 |
| Difference of air tightness | 5.6 | 8.4 | 9.5 | 17.6 | 21.1 | 22.3 | 21.5 |
As can be seen from fig. 5, when the set flow rate is constant, the air tightness of the water box is qualified, and the detected flow rate output by the water box is close to the set flow rate; and the detected flow deviation of the water box output by the water box with unqualified air tightness is larger than the set flow.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. The utility model provides an air tightness detecting system of humidification water box of respiratory support equipment which characterized in that includes: a standard gas source device, a controller and a gas outlet flowmeter; the air outlet of the standard air source device is hermetically communicated with the air inlet of the humidifying water box; the air outlet flowmeter is communicated with an air outlet of the humidifying water box; and the controller is respectively connected with the standard gas source device and the gas outlet flowmeter.
2. The system of claim 1, wherein the controller has a setting unit for setting the volume of the humidified water cartridge and the volume of the conduit into the controller.
3. The system of claim 1, further comprising an alarm device coupled to the controller.
4. A method of detecting the airtightness of a humidified water box of a respiratory support apparatus using the detection system according to any one of claims 1 to 3, comprising the steps of:
s1, connecting an air inlet of the humidifying water box with an air outlet of the standard air source device, wherein the standard air source device outputs airflow to the humidifying water box according to a set flow instruction of the controller within a preset time;
s2, detecting a detection flow value of the air outlet of the humidifying water box by the air outlet flow meter according to a detection instruction of the controller and transmitting the detection flow value to the controller;
s3, the controller obtains a flow difference value according to the set flow and the detected flow value;
s4, judging whether the flow difference value is smaller than or equal to a standard threshold value, if so, determining that the humidifying water box is qualified; if not, the humidifying water box is unqualified.
5. The method of claim 4, wherein the set flow instructions comprise a plurality of flow set points and the predetermined time.
6. The method as claimed in claim 5, wherein in step S1, the predetermined time is obtained by summing a plurality of divided times obtained for a plurality of flow setting values, respectively, and the set flow command includes the divided time for the standard air source device to operate at each flow setting value.
7. The method of claim 6, wherein the divided time is obtained according to equation (1); the formula (1) is:
wherein, TFDThe divided time is set; vHIs the volume of the humidifying water box; vGIs the line volume; l isSThe set flow value is obtained; k is a radical of1Is largeA constant at 1.
8. The method of claim 7, wherein in step S2, the detection instruction includes a plurality of detection times, and the detection is performed at a single flow rate at the detection time.
9. The method for detecting the airtightness of the humidifying water box of the respiratory support apparatus according to claim 8, wherein the detection time is calculated by formula (2); the formula (2) is:
wherein, TJCThe predetermined time is the preset time; vHIs the volume of the humidifying water box; vGIs the line volume; l isSThe set flow value is obtained; k is a radical of2Is greater than 1 and less than k1Is constant.
10. The method of claim 5, wherein the standard threshold is obtained by the controller according to the flow set value matching a standard threshold table.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114113452A (en) * | 2021-10-26 | 2022-03-01 | 安徽元琛环保科技股份有限公司 | Evaluation device and evaluation method for denitration and denitration of catalyst, VOCs and dioxin |
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| CN114113452A (en) * | 2021-10-26 | 2022-03-01 | 安徽元琛环保科技股份有限公司 | Evaluation device and evaluation method for denitration and denitration of catalyst, VOCs and dioxin |
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Application publication date: 20200421 |
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