Electronic fireproof valve for medical oxygen generator and electronic fireproof valve control circuit

Abstract

According to the electronic fire damper for the medical oxygen generator, a fire damper body, a thermistor, an air inlet connector and an air outlet connector are arranged in a matched mode, the temperature value of an oxygen outlet of the air outlet connector is detected through the resistance value change of the thermistor by means of the high sensitivity of the thermistor to heat, and whether a fire source exists or not is judged; when it is detected that the temperature exceeds a preset threshold value, the oxygen generator stops working immediately, oxygen output is stopped, and the fire extinguishing purpose is achieved; meanwhile, the fireproof valve main body is made of metal materials and is not easy to burn, so that the fire can be automatically extinguished when reaching the oxygen outlet nozzle of the air outlet joint without burning; and the fireproof valve main body is made of a metal material, so that the fireproof valve can be repeatedly used, and the cost can be effectively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen generators, in particular to an electronic fire damper for a medical oxygen generator and an electronic fire damper control circuit. Background Technique

[0002] Due to the strong oxidizing property of the high-concentration oxygen generated by the oxygen generator, in order to prevent improper use by users and cause combustion when contacting a fire source, a device for closing the fire path is required. The common fire damper or fire extinguishing valve is a plastic release design. The principle is to use the flame to burn the lock of the fire damper, the lock restricting the spring pressure in the fire damper disappears, the spring extends in the reverse direction, and the other end air outlet of the fire damper is closed, achieving the purpose of preventing the spread of the fire. However, this solution has the following defects:

[0003] 1. First of all, this fire damper is disposable and cannot be used for a long time;

[0004] 2. After the fire damper is activated, the oxygen generator is still continuously producing oxygen. When the output pressure exceeds the closing pressure of the fire damper, oxygen will still escape, resulting in the failure of fire extinguishing;

[0005] 3. Since the current fire damper is made of plastic material, when burning, it is inevitable that there will be molten plastic liquid with fire dropping onto the oxygen generator body, igniting the body and causing a larger fire. Content of the Utility Model

[0006] Based on this, it is necessary to provide an electronic fire damper for a medical oxygen generator and an electronic fire damper control circuit.

[0007] An electronic fire damper for a medical oxygen generator includes a fire damper main body and a thermistor;

[0008] The fire damper main body includes an air inlet joint and an air outlet joint. The fire damper main body is of a hollow structure. The air inlet joint and the air outlet joint are communicated. One end of the fire damper main body close to the air inlet joint is provided with a thermistor lead-out hole;

[0009] The thermistor includes a thermistor detection head and a thermistor lead. The thermistor detection head and the thermistor lead are electrically connected. The thermistor detection head is accommodated at one end of the fire damper main body close to the air outlet joint. The thermistor lead passes through the thermistor lead-out hole and is electrically connected to an external control device;

[0010] The fire damper main body is made of metal material.

[0011] In one embodiment, one end of the fire damper main body close to the air inlet joint has a first anti-slip buckle.

[0012] In one embodiment, one end of the fire damper body near the air outlet joint has a second anti-slip buckle.

[0013] In one embodiment, one end of the fire damper body near the air outlet joint has a limiting member.

[0014] In one embodiment, there is a thread on the fire damper body between the limiting member and the thermistor wire outlet hole.

[0015] In one embodiment, after the assembly of the thermistor is completed, the thermistor wire outlet hole is sealed with UV curable glue.

[0016] A control circuit for an electronic fire damper of a medical oxygen generator includes a control module U1, a thermistor NTC1, a switch S1, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a capacitor C2. The P2.0 pin of the control module U1 is respectively connected to one ends of the resistor R2 and the capacitor C2. The other end of the resistor R2 is respectively connected to one ends of the thermistor NTC1, the resistor R1, and the resistor R3. The other end of the resistor R3 is connected to one end of the switch S1. One end of the capacitor C1 is connected to the GND pin of the control module U1.

[0017] In one embodiment, the control module U1 is one of a single-chip microcomputer or an MCU module.

[0018] The above-mentioned electronic fire damper for a medical oxygen generator, through the cooperative setting of the fire damper body, the thermistor, the air inlet joint and the air outlet joint, utilizes the strong sensitivity of the thermistor to heat. By detecting the temperature value of the oxygen outlet of the air outlet joint through the resistance change of the thermistor, it judges whether there is a fire source. When the detected temperature exceeds the preset threshold, the oxygen generator immediately stops working and the oxygen output stops, achieving the purpose of extinguishing the fire. At the same time, the fire damper body is made of metal material and is not easy to burn. Therefore, when the fire reaches the oxygen outlet nozzle of the air outlet joint, it cannot burn and will also go out automatically. Moreover, since the fire damper body is made of metal material, it can be reused, effectively saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an electronic fire damper for a medical oxygen generator according to an embodiment of the present invention;

[0020] Figure 2 For Figure 1 It is a schematic cross-sectional structural diagram of an electronic fire damper for a medical oxygen generator according to an embodiment of the present invention;

[0021] Figure 3 It is a circuit schematic diagram of a control circuit of an electronic fire damper for a medical oxygen generator according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following specifically describes the specific embodiments of the present utility model in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0023] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. In contrast, when an element is referred to as being "directly" connected to another element, there is no intermediate element.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0025] As Figure 1 、 Figure 2 shown, an electronic fire damper for a medical oxygen generator includes a fire damper main body 1 and a thermistor 2;

[0026] The fire damper main body 1 includes an air inlet joint 11 and an air outlet joint 12. The fire damper main body 1 is of a hollow structure. The air inlet joint 11 and the air outlet joint 12 are communicated. One end of the fire damper main body 1 near the air inlet joint 11 is provided with a thermistor lead-out hole 13;

[0027] The thermistor 2 includes a thermistor detection head 21 and a thermistor lead 22. The thermistor detection head 21 and the thermistor lead 22 are electrically connected. The thermistor detection head 21 is accommodated at one end of the fire damper main body 1 near the air outlet joint 12. The thermistor lead 22 passes through the thermistor lead-out hole 13 and is electrically connected to an external control device; the fire damper main body 1 is made of a metal material.

[0028] The main body 1 of the fire damper is preferably made of copper material. The thermistor detection head 21 and the thermistor lead wire 22 can be integrally formed. The air inlet joint 11 is connected to the oxygen generator, the air outlet joint 12 is connected to the oxygen inhalation device, and the thermistor lead wire 22 is electrically connected to an external control module. When the user needs to inhale oxygen, the user wears the oxygen inhalation device and starts the oxygen generator. Oxygen enters the main body 1 of the fire damper through the air inlet joint 11, and then enters the oxygen inhalation device through the air outlet joint 12 for the user to inhale. The thermistor detection head 21 continuously detects the temperature value of the air outlet joint 12 and sends it to the control module. The control module compares the detected temperature value with the preset temperature value. When the detected temperature value exceeds the preset threshold, it is considered that there is a fire. The control module sends a control signal to the oxygen generator to turn off the oxygen generator.

[0029] In this way, for the electronic fire damper used in medical oxygen generators, through the coordinated setting of the main body 1 of the fire damper, the thermistor 2, the air inlet joint 11 and the air outlet joint 12, by using the strong sensitivity of the thermistor 2 to heat, the temperature value of the oxygen outlet of the air outlet joint 12 is detected through the resistance change of the thermistor 2 to judge whether there is a fire source. When the detected temperature exceeds the preset threshold, the operation of the oxygen generator is immediately stopped, and the oxygen output stops, achieving the purpose of extinguishing the fire; at the same time, the main body 1 of the fire damper is made of metal material and is not easy to burn. Therefore, when the fire reaches the oxygen outlet nozzle of the air outlet joint 12, it cannot burn and will automatically go out; moreover, the main body 1 of the fire damper is made of metal material, so it can be reused, effectively saving costs.

[0030] In one embodiment, one end of the main body 1 of the fire damper near the air inlet joint 11 has a first anti-slip buckle 3; one end of the main body 1 of the fire damper near the air outlet joint 12 has a second anti-slip buckle 4.

[0031] In this way, through the setting of the first anti-slip buckle 3, when the air inlet joint 11 is installed on the oxygen generator, the first anti-slip buckle 3 is more firmly clamped with the hose on the oxygen generator; through the setting of the second anti-slip buckle 4, the air outlet joint 12 is more firmly installed with the oxygen inhalation device.

[0032] In one embodiment, one end of the main body 1 of the fire damper near the air outlet joint 12 has a limiting member 5.

[0033] In this way, through the setting of the limiting member 5, when the intake pipe of the oxygen inhalation device is inserted into one end of the air outlet joint 12, it abuts against the limiting member 5, and the limiting member 5 plays a certain limiting role on the intake pipe.

[0034] In one embodiment, there is a thread 14 on the main body 1 of the fire damper between the limiting member 5 and the thermistor lead wire hole.

[0035] In this way, the thread 14 is used for threaded connection with an external mounting nut, facilitating the fixation of the fire damper body 1.

[0036] In one embodiment, the thermistor wire outlet hole 13 is sealed with UV curing glue after the assembly of the thermistor.

[0037] The photoinitiator (or photosensitizer) in the UV curing glue absorbs ultraviolet light under the irradiation of ultraviolet rays and generates active free radicals or cations, initiating the polymerization and cross-linking chemical reactions of monomers, so that the adhesive is transformed from a liquid state to a solid state within a few seconds. It can be positioned in a few seconds and reach the highest strength in one minute, quickly sealing the thermistor wire outlet hole 13, greatly improving the work efficiency; it is completely transparent after curing, and the product does not turn yellow or turn white for a long time.

[0038] As Figure 3 shown, a control circuit of an electronic fire damper for a medical oxygen generator includes a control module U1, a thermistor NTC1, a switch S1, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a capacitor C2. The P2.0 pin of the control module U1 is respectively connected to one ends of the resistor R2 and the capacitor C2. The other end of the resistor R2 is respectively connected to one ends of the thermistor NTC1, the resistor R1, and the resistor R3. The other end of the resistor R3 is connected to one end of the switch S1. One end of the capacitor C1 is connected to the GND pin of the control module U1; the control module U1 is one of a single-chip microcomputer or an MCU module.

[0039] The thermistor NTC1 is used to detect temperature changes. Different temperatures correspond to different resistance values. The resistor R1 provides working current for the thermistor NTC1 and forms a half-bridge at the same time. The resistor R2 gives the output of the half-bridge to the ADC input end of the control module U1. By analyzing the output voltage of the half-bridge, the corresponding resistance value is calculated. Through looking up a table or formula calculation, the temperature at the current position of the thermistor NTC1 is obtained. Since the oxygen generator is in an environment with people, the temperature will not exceed 40 degrees. Coupled with the safety value of the working temperature rise reserve of 20 degrees of the oxygen generator itself, it is therefore set that when it exceeds 70 degrees, it is an abnormal condition. When the temperature of the air outlet joint 12 detected by the thermistor NTC1 exceeds 70 degrees, the 23rd pin of the control module U1 outputs a signal to stop oxygen generation, and the oxygen generator immediately stops generating oxygen. At the same time, the 21st pin of the control module U1 outputs an alarm signal to remind people nearby to take fire extinguishing measures. Among them, the resistor R3 and the switch S1 form a test unit. When the switch S1 is pressed, the resistor R3 is connected in parallel with the thermistor NTC1, generating a signal simulating 70 degrees to verify whether the function is normal. When the switch S1 is reset, it is in the working state. It is also possible to directly heat the thermistor NTC1 to check whether a trigger signal can be generated when it is above 70 degrees. After removing the heat source, the function is not damaged and can still continue to work, belonging to a qualified electronic fire damper.

[0040] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. An electronic fire damper for a medical oxygen generator, characterized in that: It includes a fire damper body and a thermistor; The fire damper body includes an air inlet joint and an air outlet joint. The fire damper body is of a hollow structure. The air inlet joint and the air outlet joint are communicated. One end of the fire damper body close to the air inlet joint is provided with a thermistor lead-out hole; The thermistor includes a thermistor detection head and a thermistor lead-out wire. The thermistor detection head and the thermistor lead-out wire are electrically connected. The thermistor detection head is accommodated at one end of the fire damper body close to the air outlet joint. The thermistor lead-out wire passes through the thermistor lead-out hole and is electrically connected to an external control device; The fire damper body is made of a metal material.

2. The electronic fire damper for a medical oxygen generator according to claim 1, wherein: One end of the fire damper body close to the air inlet joint has a first anti-slip buckle.

3. The electronic fire damper for a medical oxygen generator according to claim 1, wherein: One end of the fire damper body close to the air outlet joint has a second anti-slip buckle.

4. An electronic fire damper for a medical oxygen generator according to claim 1, characterized in that: One end of the fire damper body close to the air outlet joint has a limiting member.

5. An electronic fire damper for a medical oxygen generator according to claim 4, characterized in that: There is a thread on the fire damper body between the limiting member and the thermistor lead-out hole.

6. The electronic fire damper for a medical oxygen generator according to claim 1, characterized in that: The thermistor lead-out hole is sealed with UV curing glue after the assembly of the thermistor is completed.

7. The control circuit of an electronic fire damper for a medical oxygen generator, characterized in that: It includes a control module U1, a thermistor NTC1, a switch S1, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a capacitor C2. The P2.0 pin of the control module U1 is respectively connected to one ends of the resistor R2 and the capacitor C2. The other end of the resistor R2 is respectively connected to one ends of the thermistor NTC1, the resistor R1, and the resistor R3. The other end of the resistor R3 is connected to one end of the switch S1. One end of the capacitor C1 is connected to the GND pin of the control module U1.

8. The control circuit of an electronic fire damper for a medical oxygen generator according to claim 7, characterized in that: The control module U1 is one of a single-chip microcomputer or an MCU module.

Images