CN215262143U - NTC temperature measurement circuit and breathing machine - Google Patents
NTC temperature measurement circuit and breathing machine Download PDFInfo
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- CN215262143U CN215262143U CN202120393353.8U CN202120393353U CN215262143U CN 215262143 U CN215262143 U CN 215262143U CN 202120393353 U CN202120393353 U CN 202120393353U CN 215262143 U CN215262143 U CN 215262143U
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Abstract
The utility model discloses a NTC temperature measurement circuit and breathing machine, NTC temperature measurement circuit includes: the temperature measuring module, the switch module, the control module and the detection module; the control module is respectively and electrically connected with the temperature measuring module, the detection module and the switch module; the switch module is respectively and electrically connected with the temperature measuring module and the detection module; the temperature measuring module is used for monitoring the temperature of a measured part in the heating loop and obtaining first temperature data; the switch module is used for switching the signal and switching between the temperature measuring module and the detection module according to the signal output by the control module; the detection module is used for checking the temperature of the temperature measuring circuit and obtaining second temperature data; the control module is used for acquiring first temperature data, adjusting the temperature of a part to be measured in the heating loop according to the first temperature data, and acquiring second temperature data and checking the accuracy of temperature measurement according to the second temperature data. The utility model discloses a power on self-checking has guaranteed the accuracy of temperature measurement to detection cost has been reduced.
Description
Technical Field
The utility model relates to the technical field of medical equipment, what especially relate to is an NTC temperature measurement circuit and breathing machine.
Background
In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means for manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field. The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications and save and prolong the life of a patient.
The ventilator is a Negative Temperature CoeffiCient (NTC) thermistor Temperature measurement product, and in order to ensure the accuracy of a ventilator Temperature measurement circuit, the ventilator needs to be checked within a certain period (generally, 3 months or 6 months is one period). The existing checking method is to use a resistor or other circuit detecting instrument to manually detect whether the circuit is faulty, and a standard resistor is usually used to replace the NTC for detection calibration, for example: when the NTC is 2.252K, the temperature of the equipment is 25.5 ℃ when the standard resistor is 2.2K, 44.5 ℃ when the standard resistor is 1K, and the equipment is qualified if the detected error is within +/-0.5 ℃, otherwise, the equipment is not qualified. The current detection scheme has the following drawbacks: 1. the detection is manual, and an additional standard detection resistor is needed, so that the cost is increased; 2. The detection is carried out within the period range, and the accuracy of the temperature measuring circuit cannot be ensured.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art not enough, an object of the utility model is to provide a NTC temperature measurement circuit and breathing machine to solve the problem that the NTC temperature measurement circuit of current breathing machine's detection cost is higher and the accuracy can't be guaranteed.
The technical scheme of the utility model as follows:
an NTC temperature measurement circuit for use in a heating circuit, the NTC temperature measurement circuit comprising: the temperature measuring module, the switch module, the control module and the detection module;
the control module is respectively and electrically connected with the temperature measuring module, the detection module and the switch module;
the switch module is electrically connected with the temperature measuring module and the detection module respectively;
the temperature measurement module is used for monitoring the temperature of a measured part in the heating loop and obtaining first temperature data;
the switch module is used for switching on and off between the temperature measuring module and the detection module according to an enabling signal output by the control module;
the detection module is used for checking the temperature in the temperature measurement circuit and obtaining second temperature data;
the control module is used for acquiring first temperature data, adjusting the temperature of a part to be measured in the heating loop according to the first temperature data, and acquiring second temperature data and checking the accuracy of temperature measurement according to the second temperature data.
The utility model discloses a further setting, the temperature measurement module includes: and one end of the NTC thermistor is electrically connected with the switch module, and the other end of the NTC thermistor is electrically connected with the control module and grounded.
The utility model discloses a further setting, detection module includes: one end of the detection resistor is used for being electrically connected with the switch module, and the other end of the detection resistor is electrically connected with the control module.
The utility model discloses a further setting, detection resistance is standard resistance.
The utility model discloses a further setting, switch module includes: and the multi-way switch is respectively connected with the control module and the power supply, and is also used for connecting the NTC thermistor and the detection resistor.
The utility model discloses a further setting, control module includes: the input end of the single chip microcomputer is electrically connected with the temperature measuring module and the detection module, and the output end of the single chip microcomputer is electrically connected with the switch module.
The utility model discloses a further setting, NTC temperature measurement circuit still includes: the input end of the operational amplifier is electrically connected with the NTC thermistor and the detection resistor, and the output end of the operational amplifier is electrically connected with the single chip microcomputer.
Based on the same utility model create, the utility model also provides a breathing machine, the breathing machine includes:
a heating circuit;
the NTC temperature measuring circuit as described above; the temperature measuring module and the detecting module are arranged in the heating loop.
The utility model discloses a further setting, the breathing machine still includes:
and the display is electrically connected with the control module.
The utility model provides a NTC temperature measurement circuit and breathing machine, wherein, NTC temperature measurement circuit is arranged in the heating circuit, NTC temperature measurement circuit includes: the temperature measuring module, the switch module, the control module and the detection module; the control module is respectively and electrically connected with the temperature measuring module, the detection module and the switch module; the switch module is electrically connected with the temperature measuring module and the detection module respectively; the temperature measurement module is used for monitoring the temperature of a measured part in the heating loop and obtaining first temperature data; the switch module is used for switching on and off between the temperature measuring module and the detection module according to an enabling signal output by the control module; the detection module is used for checking the temperature in the temperature measurement circuit and obtaining second temperature data; the control module is used for acquiring first temperature data, adjusting the temperature of a part to be measured in the heating loop according to the first temperature data, and acquiring second temperature data and checking the accuracy of temperature measurement according to the second temperature data. The utility model discloses a temperature measurement module monitors the temperature of gas in the heating pipeline to come the accuracy of proofreading the temperature measurement through detection module when the start, realized the start self-checking, can in time discover the problem, guaranteed the accuracy of temperature measurement, avoided the accident risk, avoided the manual work to patrol and examine simultaneously, feasible detection cost is reduced.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional module architecture diagram of the NTC temperature measurement circuit of the present invention.
Fig. 2 is a schematic diagram of an NTC temperature measurement circuit according to the present invention.
Fig. 3 is a schematic flow chart of the start-up self-checking method of the breathing machine of the present invention.
The various symbols in the drawings: 100. a temperature measuring module; 200. a switch module; 300. a control module; 400. a detection module; 500. a display.
Detailed Description
The utility model provides a NTC temperature measurement circuit, breathing machine and breathing machine start self-checking method, wherein NTC temperature measurement circuit is applied to in products that have NTC temperature measurement such as breathing machine, humidifier, through increasing a plurality of standard resistance on NTC temperature measurement circuit for the breathing machine can both carry out the self-checking when starting at every turn, just can normally start after detecting qualified, otherwise issues fault signal in order to inform the user to overhaul. In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail 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.
In the embodiments and claims, the articles "a", "an", "the" and "the" may include plural forms as well, unless the context specifically dictates otherwise. If there is a description in an embodiment of the present invention referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Through the research of the utility model, people find that the examination of the breathing machine is mainly to arrange the staff to patrol regularly (3 months or 6 months of a period), and the circuit is manually detected by a resistor or other circuit detecting instruments to detect whether the circuit has faults. Like this, not only can input great manpower and materials, increase manufacturing cost like this, periodic detection still has the inaccurate risk of temperature measurement moreover for the reliability is lower.
To the technical problem, the utility model provides a NTC temperature measurement circuit and breathing machine monitors the temperature of gas in the heating line through the temperature measurement module to come the accuracy of proofreading the temperature measurement through detection module when the start, realized the start self-checking, can in time discover the problem, guaranteed the accuracy of temperature measurement, avoided the accident risk, avoided the manual work to patrol and examine simultaneously, makeed to reduce the detection cost.
Referring to fig. 1 to 2, the present invention provides a preferred embodiment of an NTC temperature measurement circuit.
As shown in fig. 1, the utility model provides a pair of NTC temperature measurement circuit, it can be used in the heating circuit, NTC temperature measurement circuit includes: the temperature measuring module 100, the switch module 200, the control module 300 and the detection module 400. The control module 300 is electrically connected to the temperature measuring module 100, the detection module 400 and the switch module 200, and the switch module 200 is electrically connected to the temperature measuring module 100 and the detection module 400. The temperature measuring module 100 is configured to monitor a temperature of a measured portion in the heating circuit and obtain first temperature data, the switch module 200 is configured to switch between the temperature measuring module 100 and the detection module 400 according to an enable signal output by the control module 300, the detection module 400 is configured to calibrate the temperature in the temperature measuring circuit and obtain second temperature data, and the control module 300 is configured to obtain the first temperature data, adjust the temperature of the measured portion in the heating circuit according to the first temperature data, and obtain the second temperature data and calibrate the accuracy of temperature measurement according to the second temperature data.
Specifically, the temperature measuring module 100 is disposed in the heating circuit, and can monitor the temperature of the measured portion in the heating circuit to obtain first temperature data, and can feed back the monitored temperature to the control module 300, and the control module 300 can regulate and control the temperature of the gas in the heating circuit according to the first temperature data. In order to ensure the accuracy of temperature measurement, the NTC temperature measurement circuit is provided with the detection module 400, so that self-detection is performed during startup, the temperature in the temperature measurement circuit can be checked, the second temperature data can be obtained, and the control module 300 can judge the accuracy of temperature measurement according to the second temperature data. It can be seen that, the NTC temperature measurement circuit that this application provided, it monitors the temperature of the portion of being surveyed in the heating pipeline through temperature measurement module 100 to through detection module 400 check the accuracy of temperature measurement when the start, realized the power-on self-checking, can in time discover the problem, guaranteed the accuracy of temperature measurement, avoided the accident risk, the reliability is high, has avoided artifical the patrolling and examining simultaneously, feasible detection cost is reduced.
Referring to fig. 2, in a further implementation of an embodiment, the temperature measuring module 100 includes: and one end of the NTC thermistor RTH is electrically connected to the switch module 200, and the other end of the NTC thermistor RTH is electrically connected to the control module 300 and grounded.
Specifically, the NTC thermistor RTH is located in the temperature data line, and is partially connected to the detected part through a mounting hole or the like, for example, the gas temperature of the heating breathing circuit (when applied to a ventilator) is detected, the NTC thermistor RTH is connected to the power supply through the switch module 200 to supply power to the NTC thermistor RTH through the power supply, and the NTC thermistor RTH is further electrically connected to the control module 300, and when the NTC thermistor RTH is in a conducting state with the switch module 200, the temperature in the heating circuit can be fed back to the control module 300, so as to monitor the temperature of the gas in the heating circuit. In the breathing machine, the heating loop refers to a pipeline for breathing equipment, wherein a heating wire is arranged in the heating loop and has the functions of humidifying and heating air.
Continuing to refer to fig. 2, in a further implementation of one embodiment, the detection module 400 includes: one end of the detection resistor is electrically connected with the switch module 200, and the other end of the detection resistor is electrically connected with the control module 300.
With continued reference to fig. 2, further, the switch module 200 includes: the multi-way switch SW is respectively connected with the control module 300 and a power supply (which may be a constant current source or a constant voltage source), and is further used for connecting the NTC thermistor RTH with the detection resistor.
Specifically, the detection resistor and the NTC thermistor RTH are connected with the control module 300 through the multi-way switch SW, the control module 300 can control the multi-way switch to switch the NTC thermistor RTH and the detection resistor, when the device is started, the detection resistor is firstly switched on to realize power-on self-detection, and when the device is qualified, the device is switched to the NTC thermistor RTH to realize temperature monitoring of a heating loop, and of course, if the device is not qualified during self-detection, a fault signal is issued to inform a user of normal power-on after maintenance.
In some embodiments, the detection resistor is a standard resistor having a fixed resistance, and is used to replace the NTC thermistor during detection to obtain a desired temperature for detection, for example: when the NTC thermistor RTH is 2.252K omega, the display temperature of the equipment is 25.5 ℃ when the standard resistor RTH is 2.2K omega, and the display temperature of the equipment is 44.5 ℃ when the standard resistor 1K omega is used, if the displayed temperature error is within +/-0.5 degrees, the equipment is qualified, the equipment can be normally started, otherwise, the temperature measuring circuit is judged to have faults and is unqualified, and a fault signal can be issued through an acoustic or optical signal lamp to remind a user of the need of maintenance.
With continued reference to fig. 2, in some embodiments, the two detection resistors are a first detection resistor R1 and a second detection resistor R2, which are respectively connected to the 1 st pin and the 2 nd pin of the multi-way switch SW, and the NTC thermistor RTH is connected to the 3 rd pin of the multi-way switch. During power-on self-test, the control module 300 can sequentially switch the detection resistors with unequal resistance values, so that the power-on can be normally performed if the display temperatures of all the detection resistors are qualified. It can be understood that the more the number of the detection resistors is, the more accurate the detection result is, and in practical application, the number of the detection resistors can be set according to practical situations.
Continuing to refer to fig. 2, in a further implementation of an embodiment, the control module 300 includes: the input end of the single-chip microcomputer MCU is electrically connected with the temperature measuring module 100 and the detection module 400, and the output end of the single-chip microcomputer MCU is electrically connected with the switch module 200.
Specifically, the multi-way switch SW is switched through the MCU to achieve self-checking of the equipment. Further, the NTC temperature measurement circuit further includes: an operational amplifier OPA, wherein the input end of the operational amplifier OPA is electrically connected with the NTC thermistor RTH and the detection resistor, the output end of the operational amplifier OPA is electrically connected with the single-chip microcomputer MCU, the 1 st pin of the operational amplifier OPA is connected with the single-chip microcomputer MCU, the 2 nd pin of the operational amplifier OPA is connected with the common end COM of the multi-way switch SW, the 3 rd pin of the operational amplifier OPA is connected with the NTC thermistor RTH, the first detection resistor R1 and the second detection resistor R2, and the voltages of the NTC thermistor RTH, the first detection resistor R1 and the second detection resistor R2 are collected through the operational amplifier OPA to measure the temperature. In some embodiments, the single chip microcomputer may be of the model MSP 430.
In some embodiments, the present invention also provides a ventilator, comprising: a heating circuit and an NTC temperature measuring circuit as described above; the temperature measuring module and the detecting module are arranged in the heating loop. As described above, the details are not repeated herein.
Referring to fig. 1, in some embodiments, the ventilator further comprises: and the display 500, wherein the display 500 is electrically connected with the control module 400, and when the temperature measuring circuit is detected to have a fault, the display 500 can display the fault so as to send out a fault signal. It will be appreciated that in some embodiments, the issuing of the fault signal may also be implemented in the form of a warning light or horn or the like.
Referring to fig. 3, in some embodiments, the present invention further provides a method for self-test of a ventilator, which is applied to the ventilator described above, the method includes:
s100, acquiring temperature data of a temperature measuring circuit of the breathing machine through a detection module;
s200, comparing the temperature data with a preset temperature value through a control module, and controlling the normal starting of the breathing machine if the temperature data is within an error range;
s300, monitoring the temperature of the gas of the part to be measured in the heating loop through the temperature measuring module, and adjusting the temperature of the gas in the heating loop through the control module.
Specifically, when the breathing machine is started, the accuracy of temperature measurement is firstly checked through the detection module, if the measured temperature is within an error range, the breathing machine is normally started, otherwise, the user is reminded of needing to overhaul, and the purpose of self-checking when the breathing machine is started is achieved. After the heating circuit is normally started, the temperature of the gas of the part to be measured in the heating circuit can be monitored in real time through the temperature measuring module, the measured temperature data is fed back to the control module, and the control module can adjust the temperature of the gas in the heating circuit according to the measured temperature data.
To sum up, the utility model provides a NTC temperature measurement circuit, breathing machine and breathing machine start-up self-checking method, wherein, NTC temperature measurement circuit is arranged in the heating circuit, NTC temperature measurement circuit includes: the temperature measuring module, the switch module, the control module and the detection module; the control module is respectively and electrically connected with the temperature measuring module, the detection module and the switch module; the switch module is electrically connected with the temperature measuring module and the detection module respectively; the temperature measurement module is used for monitoring the temperature of a measured part in the heating loop and obtaining first temperature data; the switch module is used for switching on and off between the temperature measuring module and the detection module according to an enabling signal output by the control module; the detection module is used for checking the temperature in the temperature measurement circuit and obtaining second temperature data; the control module is used for acquiring first temperature data, adjusting the temperature of a part to be measured in the heating loop according to the first temperature data, and acquiring second temperature data and checking the accuracy of temperature measurement according to the second temperature data. The utility model discloses a temperature module monitors the temperature of being surveyed the portion in the heating pipeline to come the accuracy of proofreading and testing the temperature through detection module when the start, realized the start self-checking, can in time discover the problem, guaranteed the accuracy of temperature measurement, avoided the accident risk, avoided the manual work to patrol and examine simultaneously, makeed to reduce the detection cost.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. An NTC temperature measurement circuit for use in a heating circuit, comprising: the temperature measuring module, the switch module, the control module and the detection module;
the control module is respectively and electrically connected with the temperature measuring module, the detection module and the switch module;
the switch module is electrically connected with the temperature measuring module and the detection module respectively;
the temperature measurement module is used for monitoring the temperature of a measured part in the heating loop and obtaining first temperature data;
the switch module is used for switching on and off between the temperature measuring module and the detection module according to an enabling signal output by the control module;
the detection module is used for checking the temperature of the temperature measurement circuit and obtaining second temperature data;
the control module is used for acquiring first temperature data, adjusting the temperature of a part to be measured in the heating loop according to the first temperature data, and acquiring second temperature data and checking the accuracy of temperature measurement according to the second temperature data.
2. The NTC thermometry circuit of claim 1, wherein the thermometry module comprises: and one end of the NTC thermistor is electrically connected with the switch module, and the other end of the NTC thermistor is electrically connected with the control module and grounded.
3. The NTC thermometry circuit of claim 2, wherein the detection module comprises: one end of the detection resistor is used for being electrically connected with the switch module, and the other end of the detection resistor is electrically connected with the control module.
4. The NTC temperature measurement circuit of claim 3, wherein the detection resistor is a standard resistor.
5. The NTC thermometry circuit of claim 3, wherein the switch module comprises: and the multi-way switch is respectively connected with the control module and the power supply, and is also used for connecting the NTC thermistor and the detection resistor.
6. The NTC temperature measurement circuit of claim 5, wherein the control module comprises: the input end of the single chip microcomputer is electrically connected with the temperature measuring module and the detection module, and the output end of the single chip microcomputer is electrically connected with the switch module.
7. The NTC temperature measurement circuit of claim 6, wherein the NTC temperature measurement circuit further comprises: the input end of the operational amplifier is electrically connected with the NTC thermistor and the detection resistor, and the output end of the operational amplifier is electrically connected with the single chip microcomputer.
8. The NTC temperature measurement circuit of claim 7, wherein the single chip microcomputer is MSP 430.
9. A ventilator, characterized in that the ventilator comprises:
a heating circuit;
the NTC temperature measuring circuit of any of claims 1-8; the temperature measuring module and the detecting module are arranged in the heating loop.
10. The ventilator of claim 9, further comprising:
and the display is electrically connected with the control module.
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| CN202120393353.8U CN215262143U (en) | 2021-02-22 | 2021-02-22 | NTC temperature measurement circuit and breathing machine |
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| CN202120393353.8U CN215262143U (en) | 2021-02-22 | 2021-02-22 | NTC temperature measurement circuit and breathing machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112857608A (en) * | 2021-02-22 | 2021-05-28 | 东莞永胜医疗制品有限公司 | NTC temperature measurement circuit, respirator and respirator power-on self-test method |
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2021
- 2021-02-22 CN CN202120393353.8U patent/CN215262143U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112857608A (en) * | 2021-02-22 | 2021-05-28 | 东莞永胜医疗制品有限公司 | NTC temperature measurement circuit, respirator and respirator power-on self-test method |
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