Search

CN-121971255-A - Oxygen cabin exhaust system with air source self-adaptive switching function and control method

CN121971255ACN 121971255 ACN121971255 ACN 121971255ACN-121971255-A

Abstract

The invention discloses an oxygen cabin exhaust system with an air source self-adaptive switching function and a control method, and belongs to the technical field of oxygen cabins; the mask unit is used for being matched with the face of a user in a sealing mode, an air inlet of the buffer unit is communicated with an air outlet of the mask unit and used for temporarily storing waste gas exhaled by the user, the internal pressure of the buffer unit changes along with the remaining state of the waste gas, the suction unit is a vacuum pump and is arranged outside an oxygen cabin, the switching unit is a mechanical pressure response three-way switching valve and is provided with a first interface, a second interface and a third interface which are communicated, the first interface is connected with an air outlet of the buffer unit, the second interface is exposed in the environment in the oxygen cabin, a valve core is arranged on the second interface, the third interface is connected with the air inlet of the suction unit, and the switching unit is configured to automatically switch the internal passage of the buffer unit according to the pressure difference between the first interface and the second interface. The invention has simple structure, low cost and high reliability.

Inventors

  • ZHU XIAOBO
  • LI SEN

Assignees

  • 沈阳海龟医疗科技有限公司

Dates

Publication Date
20260505
Application Date
20260320

Claims (10)

  1. 1. An oxygen cabin exhaust system with air source self-adaptive switching function, comprising: a mask unit for sealing engagement with a user's face; The buffer unit is communicated with the air inlet and the air outlet of the mask unit and is used for temporarily storing the waste gas exhaled by a user, and the internal pressure of the buffer unit changes along with the residual state of the waste gas; the suction unit is a vacuum pump and is arranged outside the oxygen cabin; the switching unit is a mechanical pressure response three-way switching valve and is provided with a first interface, a second interface and a third interface which are communicated, the first interface is connected with the air outlet of the buffer unit, the second interface is exposed in the environment in the oxygen cabin, the second interface is provided with a valve core, and the third interface is connected with the air inlet of the suction unit; The switching unit is configured to automatically switch its internal passage according to a pressure difference between the first interface and the second interface: When the waste gas remains in the buffer unit and the internal pressure of the buffer unit is higher than the pressure in the cabin, the pressure of the first interface is higher than the pressure of the second interface, the valve core on the second interface is closed, the second interface is not communicated with the environment in the oxygen cabin, the first interface is communicated with the third interface, so that the suction unit sucks the waste gas in the buffer unit, and the system is in a waste gas discharge mode; When the waste gas in the buffer unit is exhausted and the internal pressure of the waste gas is lower than the pressure in the cabin, the pressure of the first interface is lower than the pressure of the second interface, the first interface is in a closed state, a valve core on the second interface is opened, the second interface is communicated with the environment in the oxygen cabin, and the second interface is communicated with the third interface, so that the suction unit is used for sucking air in the cabin in turn, and the system is in a compensation suction mode; The energy required by the action of the switching unit is completely derived from the pressure energy established in the buffer unit when a user exhales, and the pressure state of the buffer unit is simultaneously used as a signal source for controlling the action of the switching unit, so that the self-adaptive switching of the air source without the participation of external electric energy and an electronic control element is realized.
  2. 2. An oxygen cabin exhaust system with adaptive switching of air supply according to claim 1, wherein the buffer unit is an inflatable bladder made of flexible impermeable material, the volume change of which corresponds to the internal pressure change.
  3. 3. The oxygen cabin exhaust system with the air source self-adaptive switching function according to claim 1, wherein the mechanical pressure response three-way switching valve comprises a valve body, a valve cavity is arranged in the valve body, the first interface, the second interface and the third interface are communicated through the valve cavity, a valve core arranged on the second interface comprises a clamping connector core body and an elastic sealing gasket, the middle part of the clamping connector core body is clamped and fixed on the second interface, one end of the clamping connector core body is exposed out of the valve body, and the other end of the clamping connector core body is arranged in the valve body and connected with the elastic sealing gasket.
  4. 4. The oxygen cabin exhaust system with the air source self-adaptive switching function according to claim 3, wherein the elastic sealing gasket is of an arc-shaped structure, the inner side face of the elastic sealing gasket of the arc-shaped structure faces the second interface, and the edge part of the inner side face of the elastic sealing gasket of the arc-shaped structure is abutted against the second interface.
  5. 5. An oxygen cabin exhaust system with an air source adaptive switching function according to claim 1, wherein the mask unit is provided with a breathing valve group that opens/closes in synchronization with the user's breathing; The breather valve group includes: the air inlet one-way valve is arranged at the air inlet of the mask and is used for being opened when a user inhales and closed when the user exhales; and the exhaust one-way valve is arranged at the exhaust port of the mask and is used for being opened when a user exhales and closed when the user inhales.
  6. 6. A control method of an oxygen cabin exhaust system with an air source self-adaptive switching function, implemented by the oxygen cabin exhaust system with an air source self-adaptive switching function according to any one of claims 1 to 5, characterized by comprising the following steps: Step S1, temporarily storing waste gas exhaled by a user by utilizing a buffer unit, and enabling the internal pressure of the buffer unit to change along with the remaining state of the waste gas; s2, comparing the internal pressure of the buffer unit with the pressure of the environment in the oxygen cabin, and directly using the internal pressure as a mechanical control signal of the switching unit; step S3, when the waste gas remains in the buffer unit and the internal pressure of the buffer unit is higher than the pressure in the cabin, the switching unit automatically conducts a passage between the suction unit and the buffer unit under the drive of pressure difference, and a waste gas discharge mode is executed; Step S4, when the waste gas in the buffer unit is exhausted and the internal pressure of the waste gas is lower than the pressure in the cabin, the switching unit automatically conducts a passage between the suction unit and the environment in the cabin under the drive of pressure difference, and a compensation suction mode is executed; The switching action energy of the switching unit in the step S3 is completely derived from the pressure energy established in the buffer unit when the user exhales, so that the self-adaptive switching of the air source without the participation of external electric energy and an electronic control element is realized.
  7. 7. The method according to claim 6, wherein in the step S1, the buffer unit is an inflatable bladder, and the internal pressure thereof is positively correlated with the exhaust gas storage amount.
  8. 8. The method according to claim 7, wherein in the step S2, when the internal pressure of the buffer unit is higher than a predetermined threshold value, it is determined that there is no exhaust gas remaining, and when the internal pressure of the buffer unit is lower than the predetermined threshold value, it is determined that there is no exhaust gas remaining, and the predetermined threshold value is an in-cabin ambient pressure value.
  9. 9. The method according to claim 6, wherein in the steps S3 and S4, the switching unit is a mechanical pressure response three-way switching valve, and the mechanical pressure response three-way switching valve is passively executed without any sensor, controller or electric actuator.
  10. 10. The method according to claim 6, wherein in the step S4, the compensation pumping mode is automatically terminated until the next time the exhaust gas remains in the buffer unit.

Description

Oxygen cabin exhaust system with air source self-adaptive switching function and control method Technical Field The invention belongs to the technical field of oxygen cabins, and particularly relates to an exhaust system for an oxygen cabin, which can automatically switch a suction air source according to the breathing state of a user, in particular to an oxygen cabin exhaust system with an air source self-adaptive switching function and a control method. Background In the use process of the oxygen cabin (such as a hyperbaric oxygen cabin), high-concentration oxygen is required to be continuously supplied to a user, and meanwhile, waste gas (mainly carbon dioxide) exhaled by the user is timely discharged. The traditional exhaust mode mainly adopts a 'balance tube type' passive exhaust mode, namely, the exhaust mode is realized by directly communicating the inside and the outside of a cabin through a thin tube and utilizing the pressure difference between the inside and the outside of the cabin. The method has the obvious defect that when a user exhales from a large mouth, the instantaneous flow is too large, so that the exhaled air can flow back into the cabin without being exhausted, the air pollution in the cabin is caused, and the risk of cross infection is increased. In order to solve the problems, a part of oxygen cabin adopts an 'active suction' exhaust system, namely, a continuously working vacuum pump is connected with an exhaust port of a mask to forcedly extract exhaust gas. However, this way again brings new problems that when the user inhales, the continuous suction of the vacuum pump can generate negative pressure inside the mask, so that the mask clings to the face (commonly called as 'face sucking'), causing the user to be extremely uncomfortable, even the air inlet one-way valve can be forcibly opened, disturbing the normal breathing rhythm, and simultaneously causing the oxygen to be sucked away, and the waste is serious. In addition, the existing technical solutions (such as an electronic synchronous triggering type exhaust valve) for attempting to solve the problem of face suction often need to rely on a pressure sensor, a controller and an electric actuator to realize the function of cutting off suction in an inhalation phase, wherein the inhalation phase corresponds to an exhalation phase, the exhalation phase and the inhalation phase are two different phases in a respiratory cycle, the inhalation phase refers to the process of air entering the lung, and the exhalation phase refers to the process of air discharging from the lung. The scheme not only increases the complexity, cost and potential failure point of the system, but also has potential electrical safety hazards in a high-pressure oxygen-enriched environment, and the normal operation of the system completely depends on external electric energy supply. Therefore, how to abandon a complex electronic control system and to use the physical rule of the system to realize an air source self-adaptive switching method which is intrinsically safe and highly synchronous with the respiratory rhythm without the dependence of the electric appliance and other elements needing electric energy supply becomes a technical problem which is deeper in the field and is not solved for a long time. Therefore, there is a need to develop an oxygen chamber exhaust system with adaptive switching function and a control method thereof to solve the above-mentioned problems. Disclosure of Invention The invention aims at the problems and overcomes the defects of the prior art, and provides an oxygen cabin exhaust system with an air source self-adaptive switching function and a control method thereof, so as to solve the technical problems of face suction and oxygen waste caused by negative pressure generated by a continuous suction type exhaust system adopted by an oxygen cabin when a user inhales in the prior art, and overcome the defects of high complexity, poor safety, dependence on external energy and the like of an electronic and electric appliance control scheme. In order to achieve the above purpose, the invention adopts the following technical scheme: In a first aspect, the present invention provides an oxygen chamber exhaust system with adaptive switching of air supply, comprising: a mask unit for sealing engagement with a user's face; The buffer unit is communicated with the air inlet and the air outlet of the mask unit and is used for temporarily storing the waste gas exhaled by a user, and the internal pressure of the buffer unit changes along with the residual state of the waste gas; the suction unit is a vacuum pump and is arranged outside the oxygen cabin; the switching unit is a mechanical pressure response three-way switching valve and is provided with a first interface, a second interface and a third interface which are communicated, the first interface is connected with the air outlet of the buffer unit, the second interface is exposed in the e