CN220735689U - Pressure regulating system for micro-pressure oxygen cabin - Google Patents
Pressure regulating system for micro-pressure oxygen cabin Download PDFInfo
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- CN220735689U CN220735689U CN202322202974.5U CN202322202974U CN220735689U CN 220735689 U CN220735689 U CN 220735689U CN 202322202974 U CN202322202974 U CN 202322202974U CN 220735689 U CN220735689 U CN 220735689U
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- programmable controller
- electric valve
- oxygen cabin
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000001301 oxygen Substances 0.000 title claims abstract description 69
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 69
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 abstract description 12
- 230000008859 change Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 9
- 230000001603 reducing effect Effects 0.000 abstract description 9
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract description 2
- 238000002640 oxygen therapy Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- Control Of Fluid Pressure (AREA)
Abstract
The utility model discloses a pressure regulating system for a micro-pressure oxygen cabin, which comprises a gas mass flowmeter, a pressure transmitter, a programmable controller, an exhaust electric valve, an air inlet electric valve and a human-computer interface, wherein the gas mass flowmeter is connected to an RS485 communication interface of the programmable controller, and the pressure transmitter is connected to an analog input interface of the programmable controller; the analog output interface of the programmable controller is respectively connected with the exhaust electric valve and the air inlet electric valve, and the man-machine interface is connected with the other communication interface of the programmable controller. The utility model can calculate the boosting, stabilizing and reducing curves according to any set value; the programmable controller can ignore the pressure change interference caused by slight air leakage of the micro-pressure oxygen cabin by adopting PID control, so that the stability of the pressure rising and falling and stabilizing process is not influenced; the utility model has smaller sampling period, can lead the pressure to be more stable and has smaller fluctuation.
Description
Technical Field
The utility model belongs to the technical field of oxygen cabins, and particularly relates to a pressure regulating system for a micro-pressure oxygen cabin.
Background
The pressure control principle of the micro-pressure oxygen cabin is as follows: the micro-pressure oxygen cabin is inflated and pressurized by the oil-free compressor conforming to the pressure bearing capacity of the micro-pressure oxygen cabin, and the air inflow of the oil-free compressor or the air displacement of the micro-pressure oxygen cabin is adjusted in the inflation and pressurization process, so that the micro-pressure oxygen cabin can reach the working pressure in a set time, and the pressure of the micro-pressure oxygen cabin is ensured to be constant in the oxygen therapy time, so that a safe and specific oxygen-enriched atmospheric environment is formed in the micro-pressure oxygen cabin. The pressure environment of the micro-pressure oxygen cabin is a process of pressure boosting, pressure stabilizing and pressure reducing, and frequent fluctuation of pressure and the speed of pressure boosting and pressure reducing can greatly influence the comfort of oxygen therapy personnel, so that the pressure regulating system with stable pressure, adjustable speed of pressure boosting and pressure reducing is particularly important for the micro-pressure oxygen cabin.
The existing boost control mode of the micro-pressure oxygen cabin basically adopts an oil-free compressor to boost, and the air inflow is controlled or the air displacement of the micro-pressure oxygen cabin is regulated to control the boost and buck time in the boost process by controlling the frequent action of an electromagnetic valve. In the pressure stabilizing process, the pressure also has obvious fluctuation, and the frequent fluctuation of the pressure can influence the comfort of oxygen therapy personnel in the micro-pressure oxygen cabin. In addition, the stability of the pressure rising and reducing and stabilizing process is also affected due to the slight air leakage caused by the processing or assembling precision of the micro-pressure oxygen cabin, so that the pressure stabilizing control becomes more difficult.
Disclosure of Invention
The utility model aims at the problems, overcomes the defects of the prior art, and provides a pressure regulating system for a micro-pressure oxygen cabin.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the pressure regulating system for the micro-pressure oxygen cabin comprises a gas mass flowmeter, a pressure transmitter, a programmable controller, an exhaust electric valve, an air inlet electric valve and a human-computer interface, wherein the gas mass flowmeter is connected to one communication interface of the programmable controller, and the pressure transmitter is connected to an analog input interface of the programmable controller; the analog output interface of the programmable controller is respectively connected with the exhaust electric valve and the air inlet electric valve, and the man-machine interface is connected with the other communication interface of the programmable controller.
Further, the programmable controller comprises a flow closed-loop PID module, a pressure closed-loop PID module and a filtering module, wherein the signal output end of the gas mass flowmeter is connected with the flow closed-loop PID module through the filtering module, the signal output end of the pressure transmitter is connected with the pressure closed-loop PID module through the filtering module, the flow closed-loop PID module is connected with the air inlet electric valve, and the pressure closed-loop PID module is connected with the air exhaust electric valve.
Further, the programmable controller also comprises a slope calculation module which is respectively connected with the human-computer interface and the filtering module.
Further, the exhaust electric valve and the air inlet electric valve are miniature electric proportional ball valves.
Further, the communication interface of the gas mass flowmeter connected to the programmable controller is an RS485 communication interface.
Compared with the prior art, the utility model has the beneficial effects that:
1. the pressure regulating system for the micro-pressure oxygen cabin provided by the utility model has simple composition and connection mode.
2. The utility model can calculate the boosting, stabilizing and reducing curves according to any set value.
3. The programmable controller of the utility model can ignore the pressure change interference caused by slight air leakage of the micro-pressure oxygen cabin by adopting PID control, so that the stability of the pressure rising and falling and stabilizing process is not affected.
4. The utility model has smaller sampling period, can lead the pressure to be more stable and has smaller fluctuation.
Drawings
FIG. 1 is a schematic block diagram of a pressure regulating system for a micro-pressure oxygen chamber according to the present utility model.
FIG. 2 is a control flow diagram of a pressure regulating system for a micro-pressure oxygen chamber according to the present utility model.
FIG. 3 is a graph showing the pressure change of the micro-pressure chamber after the micro-pressure chamber is pressurized by the pressure regulating system for the micro-pressure chamber according to the present utility model.
In the figure: 1 is a pressure transmitter; 2 is a programmable controller; 3 is an exhaust electric valve; 4, a human-machine interface; 5 is a gas mass flowmeter; and 6 is an air inlet electric valve.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 3, an embodiment of the present utility model provides a pressure regulating system for a micro-pressure oxygen cabin, which includes a gas mass flowmeter 5, a pressure transmitter 1, a programmable controller 2, an exhaust electric valve 3, an intake electric valve 6, and a human-computer interface 4, wherein the gas mass flowmeter 5 is connected to an RS485 communication interface of the programmable controller 2, and the pressure transmitter 1 is connected to an analog input interface of the programmable controller 2; the analog output interface of the programmable controller 2 is respectively connected with the exhaust electric valve 3 and the air intake electric valve 6, and the human-computer interface 4 is connected with the other communication interface of the programmable controller 2; wherein, exhaust motorised valve 3, intake motorised valve 6 are used for being connected with micro-pressure oxygen cabin.
The programmable controller 2 is composed of a flow closed-loop PID module, a pressure closed-loop PID module, a filtering module and a slope calculating module, wherein the signal output end of the gas mass flowmeter 5 is connected with the flow closed-loop PID module through the filtering module, the signal output end of the pressure transmitter 1 is connected with the pressure closed-loop PID module through the filtering module, the flow closed-loop PID module is connected with the air inlet electric valve 6, the pressure closed-loop PID module is connected with the air outlet electric valve 3, and the slope calculating module is respectively connected with the human-computer interface 4 and the filtering module.
The exhaust electric valve 3 and the air inlet electric valve 6 are miniature electric proportional ball valves.
Specifically, the pressure transmitter 1 is a high-precision pressure transmitter, the precision grade is 0.2 grade, the response time is less than or equal to 50ms, the range of the pressure transmitter 1 is selected according to the bearing capacity of the micro-pressure oxygen cabin, the pressure transmitter 1 is used for accurately detecting the real-time pressure of the micro-pressure oxygen cabin and feeding back to the filtering module of the programmable controller 2, and the filtering module carries out filtering treatment on the real-time pressure value data detected by the pressure transmitter 1, so that the detected data is real and reliable; the programmable controller 2 is responsible for calculating the slope of the boost and the buck of the micro-pressure oxygen cabin and performing centralized control such as PID regulation output; the exhaust electric valve 3 adopts analog quantity control for the miniature electric proportional ball valve and is used for receiving a control instruction of the programmable controller 2 to realize control of the exhaust quantity of the micro-pressure oxygen cabin; the human-computer interface 4 is used for setting oxygen therapy pressure and pressure increasing and reducing time of the micro-pressure oxygen cabin and displaying a pressure change curve of the micro-pressure oxygen cabin; the air inlet electric valve 6 is a miniature electric proportional ball valve and adopts analog quantity control, and is used for receiving a control instruction of the programmable controller 2 to control the air inlet amount of the micro-pressure oxygen cabin; the gas mass flowmeter 5 is high-precision instrument equipment for detecting gas flow and component composition, and in this embodiment, the gas mass flowmeter 5 is used for detecting the gas flow and oxygen content entering the micro-pressure oxygen cabin, and the current air inlet flow of the micro-pressure oxygen cabin is read in real time and fed back to the filtering module of the programmable controller 2, and the data is filtered on the flow value, so that the read data is real and reliable.
The working principle of the pressure regulating system for the micro-pressure oxygen cabin is explained as follows: calculating ideal pressure increasing, stabilizing and reducing curves according to the set value of a user on a human-computer interface 4, deducing a pressure regulating target at the next moment, and controlling the opening of an exhaust electric valve 3 through a pressure closed-loop PID module of a programmable controller 2, thereby controlling the exhaust amount of the micro-pressure oxygen cabin; the opening size of the air inlet electric valve 6 is controlled through a flow closed-loop PID module of the programmable controller 2, so that the air inflow of the micro-pressure oxygen cabin is controlled; the actual pressure value change process of the micro-pressure oxygen cabin is consistent with the calculated pressure increasing, stabilizing and reducing curves.
The working process of the pressure regulating system for the micro-pressure oxygen cabin is described as follows: with reference to the control flowchart shown in fig. 2, the user sets parameters in the human-computer interface 4, sets the pressure increasing and decreasing time T1 and T2, the oxygen therapy time T and the oxygen therapy pressure P of the micro-pressure oxygen cabin, and transmits the information to the programmable controller 2 through the human-computer interface 4, and the slope calculating module in the programmable controller 2 calculates a standard pressure change curve according to the formula p=vt (P is the pressure value of the micro-pressure oxygen cabin, V is the pressure increasing and decreasing slope, and T is time) and according to the set value, as shown in fig. 3; and meanwhile, the average air inflow can be calculated according to the actual volume of the micro-pressure oxygen cabin. The pressure transmitter 1 reads the current pressure of the micro-pressure oxygen cabin in real time and feeds the current pressure back to the filtering module of the programmable controller 2, and filters the pressure value to ensure that the read data is real and reliable. The gas mass flowmeter 5 reads the current inlet air flow of the micro-pressure oxygen cabin in real time and feeds the current inlet air flow back to the filtering module of the programmable controller 2, and filters the flow value to enable the read data to be real and reliable.
The pressure closed-loop PID module in the programmable controller 2 can perform PID closed-loop adjustment for a period of time by comparing the pressure value read by the pressure transmitter 1 with the pressure of the calculated pressure change curve at different time, so that the actual pressure of the micro-pressure oxygen cabin is adjusted according to the calculated standard pressure change curve, the calculated adjustment value is sent to the exhaust electric valve 3, the exhaust electric valve 3 controls to change the opening size according to the received control command, the exhaust amount of the micro-pressure oxygen cabin is changed, and the purpose of controlling the actual pressure of the micro-pressure oxygen cabin is achieved. Wherein the gain parameter in the pressure closed loop PID module is negative because the pressure of the micro-pressure oxygen cabin is inversely proportional to the displacement of the micro-pressure oxygen cabin.
The flow closed-loop PID module in the programmable controller 2 can perform PID closed-loop adjustment by comparing the flow value read by the gas mass flowmeter 5 with the average air inflow calculated by the slope calculation module, so that the actual air inflow of the micro-pressure oxygen cabin is adjusted according to the calculated average air inflow, the adjustment value is sent to the air inlet electric valve 6, the air inlet electric valve 6 is controlled to change the opening size according to the received control command, the air inflow of the micro-pressure oxygen cabin is changed, and the purpose of controlling the actual air inflow of the micro-pressure oxygen cabin is further achieved. The pressure of the micro-pressure oxygen cabin is in direct proportion to the air inflow of the micro-pressure oxygen cabin, so that the gain parameter in the flow closed-loop PID module is a positive number.
Through two paths of PID closed-loop control in the programmable controller 2, the pressure stabilizing fluctuation of the micro-pressure oxygen cabin can be accurately corrected by respectively adjusting the air inlet and the air outlet of the micro-pressure oxygen cabin, so that the purpose of pressure stabilizing is achieved. In addition, the gas mass flow meter 5 is provided with a function of detecting the intake gas component of the micro-pressure oxygen chamber, detecting the intake flow rate and detecting the intake oxygen content, and has a positive effect on calculating the oxygen concentration in the micro-pressure oxygen chamber.
Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.
Claims (5)
1. A pressure regulating system for a micro-pressure oxygen chamber, characterized by: the system comprises a gas mass flowmeter, a pressure transmitter, a programmable controller, an exhaust electric valve, an air inlet electric valve and a human-computer interface, wherein the gas mass flowmeter is connected to one communication interface of the programmable controller, and the pressure transmitter is connected to an analog input interface of the programmable controller; the analog output interface of the programmable controller is respectively connected with the exhaust electric valve and the air inlet electric valve, and the man-machine interface is connected with the other communication interface of the programmable controller.
2. A pressure regulating system for a micro-pressure oxygen chamber as claimed in claim 1, wherein: the programmable controller comprises a flow closed-loop PID module, a pressure closed-loop PID module and a filtering module, wherein the signal output end of the gas mass flowmeter is connected with the flow closed-loop PID module through the filtering module, the signal output end of the pressure transmitter is connected with the pressure closed-loop PID module through the filtering module, the flow closed-loop PID module is connected with the air inlet electric valve, and the pressure closed-loop PID module is connected with the air exhaust electric valve.
3. A pressure regulating system for a micro-pressure oxygen chamber according to claim 2, wherein: the programmable controller also comprises a slope calculation module which is respectively connected with the human-computer interface and the filtering module.
4. A pressure regulating system for a micro-pressure oxygen chamber as claimed in claim 1, wherein: the exhaust electric valve and the air inlet electric valve are all miniature electric proportional ball valves.
5. A pressure regulating system for a micro-pressure oxygen chamber as claimed in claim 1, wherein: the communication interface of the gas mass flowmeter connected to the programmable controller is an RS485 communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322202974.5U CN220735689U (en) | 2023-08-16 | 2023-08-16 | Pressure regulating system for micro-pressure oxygen cabin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322202974.5U CN220735689U (en) | 2023-08-16 | 2023-08-16 | Pressure regulating system for micro-pressure oxygen cabin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220735689U true CN220735689U (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322202974.5U Active CN220735689U (en) | 2023-08-16 | 2023-08-16 | Pressure regulating system for micro-pressure oxygen cabin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220735689U (en) |
-
2023
- 2023-08-16 CN CN202322202974.5U patent/CN220735689U/en active Active
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