An oxygen supply system and control method using a liquid oxygen tank

Abstract

The present invention discloses an oxygen supply system and control method using a liquid oxygen tank, comprising a liquid oxygen tank, a vaporizer, a monitoring device and a control unit; the liquid oxygen tank is connected to the inlet of the vaporizer through a pipeline, and the outlet of the vaporizer is connected to the oxygen terminal of the ward; a pressure detection device and a gravity detection device are respectively provided on the vaporizer and the liquid oxygen tank to monitor the oxygen pressure and oxygen quantity, and the monitoring data is sent to the control unit at the same time, the control unit compares the monitoring data with a preset threshold value, and then outputs an alarm signal, so as to realize real-time monitoring of the state of the dewar tank and the oxygen pressure, and improve the stability of oxygen supply.

Description

Technical Field

[0001] The present invention relates to the field of medical oxygen supply systems, and in particular to an oxygen supply system using a liquid oxygen tank and a control method thereof. Background Art

[0002] At present, medical oxygen supply equipment is an indispensable facility in hospital construction. At present, most domestic hospitals generally use centralized oxygen supply to deliver oxygen to wards. There are special liquid oxygen stations in the hospital. In some small medical institutions or some small-scale medical units, there is no need for large-scale oxygen supply systems. Dewar bottled oxygen is mainly used. Multiple oxygen cylinders are concentrated together to supply oxygen to form a small oxygen supply system to meet medical needs.

[0003] The safety of the oxygen supply system is extremely important. Hospitals have very high requirements for the safety and reliability of the oxygen supply system. Once a failure occurs, it will have a great impact on the work of oxygen-using wards, emergency rooms, observation rooms, and operating rooms, and may even cause medical accidents and endanger the lives of patients. Therefore, the oxygen supply system needs to be monitored at all times to ensure that it is operating normally, and to detect and eliminate faults in a timely manner. Summary of the invention

[0004] In view of the safety problem of using a dewar tank for oxygen supply in the prior art, the present invention provides an oxygen supply system and a control method using a liquid oxygen tank, and uses a sensor to monitor the parameters of the dewar tank in real time and monitor the dewar tank to improve the safety of the dewar tank's oxygen supply.

[0005] The present invention is achieved through the following technical solutions:

[0006] An oxygen supply system using a liquid oxygen tank comprises a liquid oxygen bottle, a vaporizer, a monitoring device and a control unit;

[0007] The liquid oxygen bottle is connected to the inlet of the vaporizer through a pipeline, and the outlet of the vaporizer is connected to the oxygen terminal of the ward;

[0008] The monitoring device includes a weight monitoring device and a pressure detection device. The weight monitoring device is used to measure the weight parameters of the liquid oxygen bottle, and the pressure detection device is used to measure the pressure of the oxygen output by the vaporizer. The weight monitoring device and the pressure detection device are respectively connected to the control unit. The control unit compares the received weight and pressure parameters with preset thresholds and outputs an alarm signal according to the comparison result.

[0009] Preferably, a liquid outlet and a liquid drain are provided on the top of the liquid oxygen bottle, the liquid outlet and the liquid drain are respectively connected to two liquid phase inlet ends of the vaporizer through pipelines, and the liquid drain is used to adjust the pressure of the liquid oxygen bottle.

[0010] Preferably, the liquid discharge port of the liquid oxygen bottle is provided with a pressure reducing valve.

[0011] Preferably, the pressure detection device is arranged on the pipeline at the gaseous outlet end of the vaporizer to monitor the pressure of the gaseous oxygen output by the vaporizer.

[0012] Preferably, the pressure detection device is a pressure sensor.

[0013] Preferably, the weight monitoring device is an electronic scale, the liquid oxygen bottle is arranged on the electronic scale, and the electronic scale measures the weight of the liquid oxygen bottle in real time.

[0014] Preferably, the liquid oxygen bottle and the vaporizer are arranged in an equipment room, a camera device is arranged in the equipment room, and the camera device is connected to the control unit.

[0015] Preferably, the control unit is connected to a terminal device via the Internet of Things, and the terminal device is used to receive and display the pressure, weight parameters and operating status of the liquid oxygen cylinder.

[0016] Preferably, the liquid oxygen bottle and the vaporizer are redundantly configured.

[0017] A control method for an oxygen supply system using a liquid oxygen tank, wherein a controller obtains weight parameters of the liquid oxygen tank and pressure parameters of the gas delivery oxygen in real time, and compares the obtained parameters with threshold values ​​preset in the controller;

[0018] When the obtained weight parameter is less than the maximum weight value, a weight warning signal is sent, and the alarm device outputs an alarm according to the warning signal; when the obtained weight parameter is less than the minimum weight value, a replacement signal is sent;

[0019] When the acquired oxygen pressure parameter is greater than the upper pressure limit threshold, the control unit outputs an overpressure warning signal and starts the pressure reducing valve to reduce the pressure; when the acquired oxygen pressure parameter is less than the lower pressure limit threshold, the control unit outputs an underpressure warning signal; when the acquired pressure parameter is equal to or less than the hypoxia threshold, the control unit outputs a hypoxia warning signal.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The present invention provides an oxygen supply system using a liquid oxygen tank, in which a dewar tank is connected to oxygen-using equipment in a ward through a vaporizer, and liquid oxygen is converted into gas for use in the ward. A pressure detection device and a gravity detection device are respectively provided on the vaporizer and the liquid oxygen tank to monitor the oxygen pressure and oxygen quantity, and the monitoring data is sent to a control unit. The control unit compares the monitoring data with a preset threshold value, and then outputs an alarm signal, thereby realizing real-time monitoring of the dewar tank state and oxygen pressure, and improving the stability of oxygen supply.

[0022] Furthermore, the exhaust port of the Dewar tank is connected to the vaporizer, and the internal pressure of the Dewar tank is adjusted through the exhaust port. When pressure relief is required, the oxygen to be discharged is introduced into the vaporizer through the exhaust port, thereby achieving pressure regulation and avoiding waste of oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the dewar tank oxygen supply system of the present invention.

[0024] In the figure: 1. Dewar tank; 2. Vaporizer; 3. Pipeline; 4. Manifold; 5. Electronic scale; 6. Control unit; 7. Sound and light alarm; 8. Pressure sensor; 9. Oxygen interface; 10. Camera device; 11. Liquid outlet; 12. Drain; 21. Inlet; 22. Outlet. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0026] See also Figure 1 , an oxygen supply system using a liquid oxygen tank, including a dewar tank 1, a vaporizer 2, a monitoring device, an alarm device and a control unit 6.

[0027] The dewar tank 1 is connected to the inlet of the vaporizer 2 through a pipeline 3, and the outlet of the vaporizer 2 is connected to the oxygen terminal of the ward.

[0028] The monitoring device includes a weight monitoring device and a pressure detection device. The weight monitoring device is used to measure the weight parameters of the Dewar tank, and the pressure detection device is used to measure the pressure of the oxygen output by the vaporizer. The weight monitoring device and the pressure detection device are respectively connected to the control unit. The weight and pressure parameters received by the control unit are compared with the preset threshold values, and an alarm signal is output according to the comparison result. The alarm device is connected to the control unit and an alarm prompt is issued according to the alarm signal.

[0029] The top of the dewar tank 1 is provided with a liquid outlet 11 and a liquid drain 12, which are respectively connected to two liquid phase inlet ports 21 of the vaporizer 2 through pipelines 3, and the gas phase outlet port 22 of the vaporizer 2 is connected to the oxygen terminal of the ward.

[0030] The vaporizer 2 is used to convert the liquid oxygen in the Dewar tank 1 into gaseous oxygen and output it. The pressure detection device is a pressure sensor 8. The pressure sensor 8 is arranged on the gas phase outlet end pipeline of the vaporizer 2 to monitor the pressure of the gaseous oxygen output by the vaporizer 2 and send it to the control unit. The upper limit threshold and the lower limit threshold are preset in the control unit.

[0031] When the collected pressure is less than the lower limit threshold, the control unit outputs an underpressure alarm signal to prompt the staff to replace the dewar tank.

[0032] When the collected pressure is greater than the upper threshold, the control unit outputs an overpressure alarm signal. A pressure reducing valve is provided on the pipeline of the discharge port 12. When the collected pressure is greater than the upper threshold, the pressure reducing valve is started to input the liquid oxygen in the Dewar tank into the vaporizer to reduce the pressure of the Dewar tank. At the same time, the discharged liquid oxygen is output to the vaporizer through the pipeline, thereby avoiding the problem of oxygen waste and improving the utilization rate.

[0033] When the pressure is less than the hypoxia threshold, it means that the oxygen in the Dewar tank is about to run out, and an hypoxia warning signal is output.

[0034] The weight monitoring device is an electronic scale 5, on which the Dewar tank is arranged. The electronic scale 5 monitors the weight of the Dewar tank in real time and sends the weight information to the control unit. The remaining amount of liquid oxygen in the Dewar tank can be known according to the weight information, and the content of liquid oxygen in the Dewar tank is monitored by combining the pressure data and the weight data.

[0035] Each vaporizer is connected to at least one Dewar tank, preferably 2-3.

[0036] The control unit is connected to the Internet of Things platform, which is used to receive and store the pressure and weight parameters of the Dewar tank, as well as the status information of the Dewar tank, such as overpressure, underpressure and empty tank information, and send the parameters and status information to the terminal device in real time, so that the monitoring personnel can check the pressure and weight parameters of the Dewar tank and the status of the Dewar tank. At the same time, the alarm signal output by the control unit is pushed to the terminal device to remind the monitoring and maintenance personnel.

[0037] The dewar tank and the vaporizer are arranged in the equipment room, and a camera device 10 is arranged in the equipment room to monitor the status of the dewar tank and the vaporizer in the equipment room in real time. The camera device is connected to the control unit, and the collected video information is sent to the Internet of Things platform through the control unit, and then pushed to the terminal device. The user can view the current real-time information or troubleshoot in time according to the alarm information.

[0038] The terminal device is a display, a terminal computer or a mobile phone terminal arranged in a monitoring room.

[0039] The alarm device is preferably an audible and visual alarm 7 .

[0040] The control unit is a PLC controller.

[0041] The above-mentioned dewar tank and vaporizer are redundantly arranged, with two dewar tanks and two vaporizers, each vaporizer is connected to a dewar tank, the gas phase outlet ends of the two vaporizers are connected to the output pipeline through a three-way valve, and the output pipeline is connected to the oxygen-using equipment. A control valve is set at the outlet of each vaporizer to allow the two vaporizers to be used alternately. When one of them is maintaining the vaporizer or replacing the dewar tank, the oxygen is supplied by another group to avoid the problem of oxygen supply interruption.

[0042] A control method for an oxygen supply system using a liquid oxygen tank, wherein a controller obtains weight parameters of a dewar tank and pressure parameters of transmitted oxygen in real time through an electronic scale and a pressure sensor, and compares the obtained parameters with thresholds preset in the controller.

[0043] The thresholds include weight thresholds and pressure thresholds;

[0044] The weight thresholds are the maximum weight and the minimum weight. When the acquired weight parameter is less than the maximum weight, a weight warning signal is sent, and the alarm device outputs an alarm according to the warning signal.

[0045] As the usage time increases, the weight of the Dewar tank continues to decrease. When the obtained weight parameter is less than the minimum weight, it means that the liquid oxygen in the Dewar tank is about to be consumed, and a replacement signal is sent. The alarm device outputs a corresponding alarm according to the replacement signal to remind the staff to replace the Dewar tank with a new one.

[0046] The pressure thresholds include an upper pressure threshold, a lower pressure threshold and an oxygen deprivation threshold.

[0047] When the obtained oxygen pressure parameter is greater than the upper pressure limit threshold, it means that the output oxygen pressure is too high and the equipment terminal is not used. The control unit outputs an overpressure warning signal and starts the pressure reducing valve to reduce pressure. The alarm device outputs an alarm according to the overpressure warning signal.

[0048] When the obtained oxygen pressure parameter is less than the lower pressure threshold, it means that the output oxygen pressure is too low, the device terminal is not used, the control unit outputs an underpressure warning signal, and the alarm device outputs an alarm according to the underpressure warning signal.

[0049] When the acquired pressure parameter is equal to or less than the hypoxia threshold, it means that the liquid oxygen in the dewar tank is about to be consumed, and an hypoxia warning signal is output to remind the staff to replace the dewar tank.

[0050] During real-time monitoring, when the pressure parameter is equal to or less than the hypoxia threshold, or when the obtained weight parameter is less than the minimum weight, the Dewar tank needs to be replaced to ensure the safety of oxygen use.

[0051] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An oxygen supply system using a liquid oxygen tank, characterized in that: It comprises a liquid oxygen bottle, a vaporizer (2), a monitoring device and a control unit (6); The top of the liquid oxygen bottle is provided with a liquid outlet (11) and a liquid drain port (12), the liquid outlet (11) and the liquid drain port (12) are respectively connected to two liquid phase inlet ports (21) of the vaporizer (2) through pipelines (3), the liquid drain port is used to adjust the pressure of the liquid oxygen bottle, and the outlet of the vaporizer (2) is connected to the oxygen terminal of the ward; The monitoring device includes a weight monitoring device and a pressure detection device, the weight monitoring device is used to measure the weight parameter of the liquid oxygen bottle, and the pressure detection device is used to measure the pressure of the oxygen output by the vaporizer. The weight monitoring device and the pressure detection device are respectively connected to the control unit, and the control unit compares the received weight and pressure parameters with the preset threshold values ​​and outputs an alarm signal according to the comparison result; The pressure detection device is arranged on the pipeline at the gaseous outlet end of the vaporizer to monitor the pressure of the gaseous oxygen output by the vaporizer (2); In the control method of the oxygen supply system using a liquid oxygen tank, the controller obtains the weight parameter of the liquid oxygen bottle and the pressure parameter of the gas delivery oxygen in real time, and compares the obtained parameters with the threshold value preset in the controller; When the obtained weight parameter is less than the maximum weight value, a weight warning signal is sent, and the alarm device outputs an alarm according to the warning signal; when the obtained weight parameter is less than the minimum weight value, a replacement signal is sent; When the acquired oxygen pressure parameter is greater than the upper pressure limit threshold, the control unit outputs an overpressure warning signal and starts the pressure reducing valve to reduce the pressure; when the acquired oxygen pressure parameter is less than the lower pressure limit threshold, the control unit outputs an underpressure warning signal; when the acquired pressure parameter is equal to or less than the hypoxia threshold, the control unit outputs a hypoxia warning signal.

2. The oxygen supply system using a liquid oxygen tank according to claim 1, characterized in that: The liquid discharge port of the liquid oxygen bottle is provided with a pressure reducing valve.

3. The oxygen supply system using a liquid oxygen tank according to claim 1, characterized in that: The pressure detection device is a pressure sensor.

4. The oxygen supply system using a liquid oxygen tank according to claim 1, characterized in that: The weight monitoring device is an electronic scale (5), the liquid oxygen bottle is arranged on the electronic scale (5), and the electronic scale (5) measures the weight of the liquid oxygen bottle in real time.

5. The oxygen supply system using a liquid oxygen tank according to claim 1, characterized in that: The liquid oxygen bottle and the vaporizer are arranged in an equipment room, a camera device (10) is arranged in the equipment room, and the camera device (10) is connected to the control unit.

6. An oxygen supply system using a liquid oxygen tank according to claim 1 or 5, characterized in that: The control unit is connected to the terminal device through the Internet of Things, and the terminal device is used to receive and display the pressure, weight parameters and operating status of the liquid oxygen bottle.

7. The oxygen supply system using a liquid oxygen tank according to claim 1, characterized in that: The liquid oxygen bottle and the vaporizer are redundantly configured.

Images