Electric control injection oxygen mixing device

Abstract

The utility model discloses an electric control injection oxygen mixing device which comprises a shell, a breathing cavity, an injection pipe, an air valve, a differential pressure transducer, a controller, a linear motor, an electric control seat, an electric control valve cover plate and an electric control valve seat, the injection pipe is installed in the shell, an inlet of the injection pipe is communicated and connected with the electric control valve seat, the electric control seat is installed on the shell, and the air valve is installed in the breathing cavity. The linear motor is installed on the electric control seat, the electric control seat is provided with an electric control seat through hole, a driving rod of the linear motor is located in the electric control seat through hole, the suspended end of the driving rod is connected with an electric control valve cover plate, an oxygen inlet channel is formed in the hole wall of the electric control seat through hole, and the differential pressure sensor is installed on the cavity wall of the breathing cavity. And the differential pressure sensor and the linear motor are respectively connected with the controller. According to the utility model, the purpose of automatically controlling the oxygen concentration in the mixed gas according to the vital capacity of oxygen uptake personnel is achieved, and the problem of oxygen deficit or oxygen poisoning caused by different vital capacities of the oxygen uptake personnel is avoided.

Description

Technical Field

[0001] This utility model relates to an oxygen mixing device for mixing high-concentration oxygen with normal-pressure air, and more particularly to an electrically controlled ejector oxygen mixing device. Background Technology

[0002] In oxygen supply systems, the oxygen produced by oxygen generators or the oxygen output from oxygen cylinders is generally high-concentration oxygen. If inhaled directly by the human body, it may cause oxygen poisoning. Therefore, it is generally necessary to mix the high-concentration oxygen with normal-pressure air through an oxygen mixing device before inhalation to make the oxygen concentration suitable for the human body.

[0003] An ejector oxygen mixing device is an oxygen mixing device that uses a high oxygen flow to control the opening and closing of an air valve. Its basic structure includes a shell, an air valve, a breathing chamber, and an ejector tube. One end of the breathing chamber is connected to the shell. The ejector tube is installed inside the shell with its outlet located inside the breathing chamber. The air valve is installed at the air inlet of the shell. During operation, the inlet of the ejector tube is connected to the oxygen supply equipment (oxygen generator or oxygen cylinder, etc.). The high-pressure, high-concentration oxygen in the ejector tube is converted into a high-speed oxygen flow and sprayed into the breathing chamber, creating a negative pressure inside the breathing chamber. This negative pressure, combined with the negative pressure generated by the oxygen user's inhalation, causes the air valve to open, introducing normal-pressure air into the breathing chamber to mix with the high-concentration oxygen. The mixture is then inhaled by the oxygen user through a breathing mask.

[0004] Traditional oxygen mixing devices have the following drawbacks: the oxygen flow rate in the ejector tube cannot be automatically adjusted according to the user's lung capacity. Therefore, the amount of high-concentration oxygen entering the respiratory chamber per unit time is the same for everyone. However, because different users have different lung capacities, those with larger lung capacities create a greater negative pressure in the respiratory chamber during inhalation, resulting in a wider opening of the air valve and a larger flow of atmospheric pressure air into the respiratory chamber. This leads to a lower oxygen concentration in the mixed gas, failing to meet the oxygen concentration curve requirements and easily causing hypoxia. Conversely, those with smaller lung capacities create a lower negative pressure in the respiratory chamber during inhalation, resulting in a smaller opening of the air valve and a smaller flow of atmospheric pressure air into the respiratory chamber. This leads to a higher oxygen concentration in the mixed gas, exceeding or far exceeding the oxygen concentration curve requirements, and easily causing oxygen poisoning. Utility Model Content

[0005] The purpose of this invention is to provide an electrically controlled oxygen mixing device that can automatically adjust the oxygen flow rate in the ejector tube according to the lung capacity of the person receiving oxygen therapy, in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] An electrically controlled ejector oxygen mixing device includes a housing, a breathing chamber, an ejector tube, and an air valve. The breathing chamber and an air inlet pipe are respectively connected to the housing. The air valve is installed inside the air inlet pipe. The ejector tube is installed inside the housing, and its outlet is located inside the breathing chamber. The electrically controlled ejector oxygen mixing device further includes a differential pressure sensor, a controller, a linear motor, an electrical control base, an electrical control valve cover, and an electrical control valve seat. The inlet of the ejector tube is connected to the annular electrical control valve seat, and the axial direction of the electrical control valve seat is the same as the axial direction of the ejector tube. The outer end of the electrical control valve seat is located outside the corresponding side wall surface of the housing. The electrical control base is mounted on the housing, and the linear motor is mounted on the electrical control base. The electrical control base has an electrical control base through hole. The outer end of the electrical control valve seat is located inside the electrical control base through hole. The drive rod of the linear motor is located inside the electrical control base through hole, and the axis of the drive rod is the same as the axis of the electrical control valve seat. The suspended end of the drive rod is connected to the electrical control valve cover plate. The diameter of the electrical control valve cover plate is larger than the diameter of the electrical control valve seat and is perpendicular to the axis of the electrical control valve seat. The wall of the electrical control base through hole has an oxygen inlet channel that communicates with the inside and outside. The differential pressure sensor for detecting the pressure difference inside and outside the breathing chamber is installed on the cavity wall of the breathing chamber. The signal output terminal of the differential pressure sensor is connected to the signal output terminal of the controller. The control output terminal of the controller is connected to the control input terminal of the linear motor.

[0008] Preferably, to prevent oxygen in the oxygen intake channel and the through hole of the electrical control seat from being discharged outside the electrical control seat through the through hole and wasting it, an annular groove is provided on the circumferential wall of the through hole of the electrical control seat, and an O-ring is installed in the annular groove. The drive rod passes through the central through hole of the O-ring and is in close contact with the inner wall of the O-ring. The O-ring is located between the linear motor and the oxygen intake channel.

[0009] Preferably, for ease of processing and assembly, the inner circumferential wall of the ejector tube extends axially outward to form the electrically controlled valve seat.

[0010] Preferably, in order to facilitate connection with a breathing mask, the air outlet of the breathing cavity is provided with a mask interface for connection with a breathing mask.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention adds a differential pressure sensor, a controller, a linear motor, an electric control base, an electric control valve cover, and an electric control valve seat to form an electric control valve at the inlet of the ejector tube, with the opening degree controlled by the linear motor. During use, the differential pressure sensor can detect the negative pressure in the breathing chamber and control the extension of the linear motor drive rod, thereby changing the flow rate of high-concentration oxygen entering the ejector tube. Ultimately, it achieves the goal of automatically controlling the oxygen concentration in the mixed gas according to the lung capacity of the oxygen user, avoiding the problem of hypoxia or oxygen poisoning caused by different lung capacities of oxygen users. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the electrically controlled oxygen mixing device described in this utility model;

[0014] Figure 2 This is a front cross-sectional view of the electrically controlled oxygen mixing device described in this utility model. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] like Figure 1 and Figure 2As shown, the electrically controlled ejector oxygen mixing device of this utility model includes a housing 4, a breathing chamber 5, an ejector tube 13, an air valve 11 (a conventional air valve, the specific structure of which will not be described in detail), a differential pressure sensor 14, a controller (not shown in the figure, a conventional controller can be used), a linear motor 1, an electric control base 2, an electric control valve cover plate 9, and an electric control valve seat 10. The breathing chamber 5 and the air inlet pipe 3 are respectively connected to the housing 4. The air valve 11 is installed inside the air inlet pipe 3. The ejector tube 13 is installed inside the housing 4, and its outlet is located inside the breathing chamber 5. The inlet of the ejector tube 13 is connected to a circular electric control valve seat 10, and the axial direction of the electric control valve seat 10 is the same as the axial direction of the ejector tube 13. The outer end of the electric control valve seat 10 is located outside the corresponding side wall surface of the housing 4. The electric control base 2 is installed on the housing 4. Linear motor 1 is mounted on electrical control base 2, which has an electrical control base through hole (not marked in the figure). The outer end of electrical control valve seat 10 is located inside the electrical control base through hole. The drive rod 7 of linear motor 1 is located inside the electrical control base through hole, and the axis of the drive rod 7 is the same as the axis of electrical control valve seat 10. The suspended end of the drive rod 7 is connected to an electrical control valve cover plate 9. The diameter of the electrical control valve cover plate 9 is larger than the diameter of electrical control valve seat 10 and is perpendicular to the axis of electrical control valve seat 10. An oxygen inlet channel 12 with internal and external communication is provided on the wall of the electrical control base through hole. A differential pressure sensor 14 for detecting the pressure difference inside and outside the breathing chamber 5 is mounted on the cavity wall of the breathing chamber 5. The signal output terminal of the differential pressure sensor 14 is connected to the signal output terminal of the controller. The control output terminal of the controller is connected to the control input terminal of linear motor 1.

[0017] Preferably, to prevent oxygen in the oxygen inlet channel 12 and the through hole of the electrical control seat from being discharged outside the electrical control seat 2 through the through hole of the electrical control seat, an annular groove is provided on the circumferential wall of the through hole of the electrical control seat, and an O-ring seal 8 is installed in the annular groove. The drive rod 7 passes through the central through hole of the O-ring seal 8 and is in close contact with the inner wall of the O-ring seal 8. The O-ring seal 8 is located between the linear motor 1 and the oxygen inlet channel 12. In order to facilitate processing and assembly, the inner circumferential wall of the inlet of the ejector tube 13 extends axially outward to form an electrical control valve seat 10. In order to facilitate connection with a breathing mask (not shown in the figure), the outlet end of the breathing chamber 5 is provided with a mask interface 6 for connection with a breathing mask.

[0018] like Figure 1 and Figure 2As shown, during use, the outer end of the oxygen inlet channel 12 is connected to the oxygen supply equipment (not shown in the figure, such as an oxygen generator or oxygen cylinder), and the mask interface 6 is connected to the breathing mask. High-pressure, high-concentration oxygen first enters the through hole of the electric control seat from the oxygen inlet channel 12, then enters the electric control valve seat 10 through the gap between the electric control valve cover plate 9 and the electric control valve seat 10, and then enters the ejector tube 13. The high-pressure, high-concentration, low-speed airflow is converted into a low-pressure, high-speed airflow through the outlet of the ejector tube 13, forming a negative pressure in the breathing chamber 5. Combined with the negative pressure generated by the oxygen user (such as a pilot) inhaling, the air valve 11 is automatically opened, and normal-pressure air enters the breathing chamber 5, mixes with the high-concentration oxygen to form a mixed gas with a suitable oxygen concentration, and is then inhaled by the oxygen user.

[0019] The principle behind the automatic adjustment of oxygen flow rate during inhalation based on the individual's lung capacity is as follows: When the individual's lung capacity is large, the negative pressure within the breathing chamber 5 is greater, resulting in a wider opening of the air valve 11 and allowing more atmospheric pressure air to enter the breathing chamber 5. Simultaneously, the differential pressure sensor 14 transmits the detected differential pressure signal to the controller, which reduces the extension distance of the drive rod 7 of the linear motor 1. This increases the distance between the electrically controlled valve cover 9 and the electrically controlled valve seat 10, thereby increasing the oxygen flow rate entering the breathing chamber 5 through the electrically controlled valve seat 10 and the ejector tube 13, and mixing with the air. After mixing with air, the oxygen concentration remains constant or changes only slightly. When the lung capacity of the person receiving oxygen is small, the negative pressure inside the breathing chamber 5 is small, so the opening degree of the air valve 11 is small, and less atmospheric pressure air enters the breathing chamber 5. At the same time, the differential pressure sensor 14 transmits the detected differential pressure signal to the controller, which controls the extension distance of the drive rod 7 of the linear motor 1 to increase, thereby reducing the distance between the electrically controlled valve cover 9 and the electrically controlled valve seat 10. This reduces the oxygen flow rate entering the breathing chamber 5 through the electrically controlled valve seat 10 and the ejector tube 13, resulting in a constant or minimal change in oxygen concentration after mixing with air. In summary, regardless of whether the lung capacity of the person receiving oxygen is large or small, the oxygen concentration of the final inhaled mixed gas is within a reasonable range, avoiding the problem of hypoxia or oxygen poisoning caused by differences in the lung capacity of the person receiving oxygen.

[0020] Additionally, since oxygen is always required to pass between the electrically controlled valve cover plate 9 and the electrically controlled valve seat 10, the gap between them does not need to be reduced to zero. Therefore, it is not necessary to install a sealing gasket on the electrically controlled valve cover plate 9. In other words, the opening amount of the electrically controlled valve can be controlled by the linear motor 1, but it is not necessary to control the electrically controlled valve to close completely by the linear motor 1.

[0021] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. An electrically controlled ejector oxygen mixing device, comprising a housing, a breathing chamber, an ejector tube, and an air valve, wherein the breathing chamber and an air inlet pipe are respectively connected to the housing, the air valve is installed inside the air inlet pipe, and the ejector tube is installed inside the housing with its outlet located inside the breathing chamber, characterized in that: The electrically controlled ejector oxygen mixing device further includes a differential pressure sensor, a controller, a linear motor, an electrical control base, an electrically controlled valve cover, and an electrically controlled valve seat. The inlet of the ejector tube is connected to the annular electrically controlled valve seat, and the axial direction of the electrically controlled valve seat is the same as the axial direction of the ejector tube. The outer end of the electrically controlled valve seat is located outside the corresponding side wall surface of the housing. The electrical control base is mounted on the housing, and the linear motor is mounted on the electrical control base. The electrical control base has an electrical control base through hole, and the outer end of the electrically controlled valve seat is located within the electrical control base through hole. The drive rod of the linear motor is located on the electrical control base. The drive rod has its axis aligned with the axis of the electrically controlled valve seat, and the suspended end of the drive rod is connected to the electrically controlled valve cover plate. The diameter of the electrically controlled valve cover plate is larger than the diameter of the electrically controlled valve seat and is perpendicular to the axis of the electrically controlled valve seat. The wall of the through hole of the electrically controlled valve seat is provided with an oxygen inlet channel that communicates with both the inside and outside. The differential pressure sensor for detecting the pressure difference between the inside and outside of the breathing chamber is installed on the wall of the breathing chamber. The signal output terminal of the differential pressure sensor is connected to the signal output terminal of the controller, and the control output terminal of the controller is connected to the control input terminal of the linear motor.

2. The electrically controlled ejector oxygen mixing device according to claim 1, characterized in that: The circumferential wall of the through hole of the electrical control base is provided with an annular groove and an O-ring is installed in the annular groove. The drive rod passes through the central through hole of the O-ring and is in close contact with the inner wall of the O-ring. The O-ring is located between the linear motor and the oxygen intake channel.

3. The electrically controlled ejector oxygen mixing device according to claim 1 or 2, characterized in that: The inner circumference of the ejector tube extends axially outward to form the electrically controlled valve seat.

4. The electrically controlled ejector oxygen mixing device according to claim 1 or 2, characterized in that: The air outlet of the breathing cavity is provided with a mask interface for connecting to a breathing mask.

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