Patent Grant
11648425
The present invention relates to a safety device for coal mine, and in particular, to a chemical oxygen self-rescue device.
Self-rescue device products are approximately divided into two types: reciprocating structure and cycling structure.
In the reciprocating structure, the breathing gas inlet and outlet are both breathing hoses. The gas bag is located on the bottom of the agent tank, the gas discharge valve is generally located on the gas bag, and the breathing gas passes through the agent tank twice. The air flow passes through the agent tank twice, so that the water vapour blown to the substratum of the agent can return to supertratum, the water vapour can be uniformly distributed in the agent tank and agglomeration can be alleviated, the rising of breathing resistance can be moderated, oxygen can be released uniformly, and the utilization rate of oxygen can be improved. However, because the breathing gas all passes through the agent tank, the inspired gas is also heated and the temperature of the breathing gas is high, thus the reaction rate is accelerated, and the oxygen content is increased. The discharge mode is gas bag discharge mode, the oxygen content of the gas discharged is high, and utilization rate of the agent is lowered.
In the cycling structure, the expired gas reaches the agent tank via the expiration hose. The gas bag is an overhead-type gas bag and the expiration hose is located in the gas bag. When the gas bag expands to a certain degree, the gas discharge valve is driven to open, and the gas in the gas bag is directly inspired, and the breathing gas passes through the agent tank once. In this structure, the expired gas enters the oxygen generating agent tank in one direction and reacts with the oxygen generating agent. At this moment, the water vapour in the expired gas is blown to and gathered on the bottom of the agent tank, which causes serious agglomeration of the substratum agent, so that the expiration resistance rises dramatically in the late stage of the protective time, and the amount of oxygen released in the early stage is higher than that in the late stage, thus the utilization rate of oxygen will be lowered. Because the air flow only passes through the agent layer once, the CO2 is not absorbed thoroughly.
During the development of the chemical oxygen self-rescue device, it has been proved by a large number of tests and investigations that, compared with the cycling structure, the reciprocating structure has significant advantages in the utilization rate of the agent and the resistance, etc. However, in the reciprocating structure, the gas discharge valve is often located on the gas bag, and during discharging, a majority of the gas components is oxygen, thus the reaction rate will be accelerated, and the utilization rate of the agent will be lowered, and as a result, the breathing temperature will rise. In order to reach the nominal protective time, the amount of agent must be increased, thus the cost is added.
Therefore, it is an object of the present invention to provide a chemical oxygen self-rescue device, thereby reducing breathing resistance, lowering the temperature of breathed gas and improving the utilization rate of the oxygen generating agent.
To attain the above object, the invention provides a chemical oxygen self-rescue device, which comprises a breathing assembly, an oxygen generating assembly and a gas bag sequentially communicated with each other, wherein the oxygen generating assembly comprises an oxygen generating agent tank, a gas discharge valve and an oxygen candle, the gas discharge valve is arranged on a component above the oxygen generating agent in the oxygen generating agent tank and below a breathing end of the breathing assembly, and the opening and closing of the gas discharge valve are controlled by an inflated volume of the gas bag.
A heat radiation assembly and an oxygen generating agent are provided in the oxygen generating agent tank, wherein the heat radiation assembly communicates the breathing assembly and the oxygen generating agent tank, and the heat radiation assembly divides the oxygen generating agent tank into a plurality of accommodation spaces for loading the oxygen generating agent while filtering and cooling the gas in the oxygen generating agent tank.
The heat radiation assembly comprises a vent pipe and a heat radiation frame, wherein the vent pipe communicates the breathing assembly with the oxygen generating agent tank, the heat radiation frame is provided in the oxygen generating agent tank, and the oxygen generating agent tank is divided, by the vent pipe and the heat radiation frame, into a plurality of accommodation spaces for loading the oxygen generating agent.
Optionally, the gas discharge valve comprises a valve body and a valve core, wherein the valve body communicates the oxygen generating agent tank with the atmosphere, the valve core is provided in the valve body, one end of the valve core blocks an end of the valve body communicating with the atmosphere, and the blocking area of the valve core is less than the cross-sectional area of the valve body, and the other end of the valve core is connected with the gas bag.
Optionally, the gas discharge valve comprises a valve body, a valve core, a valve seat, a spring and a valve core pull-cord, wherein the valve body communicates the oxygen generating agent tank with the atmosphere, the valve seat is movably provided in the valve body, the valve core is restricted on the valve seat by the spring for blocking the valve body, and the valve core is connected with the inner wall of the gas bag via the valve core pull-cord.
Optionally, the spring is a spiral spring with a diameter enlarging gradually from the end part of the valve body far away from the oxygen generating agent tank to the end part of the valve body close to the oxygen generating agent tank.
Optionally, the heat radiation frame comprises heat radiation plates at least provided crosswise, wherein the number of the heat radiation plates provided crosswise is at least two, and the intersection angle of adjacent heat radiation plates is 60˜90°.
Optionally, the heat radiation plate comprises a ventilation limit frame, in which a plurality of heat radiation meshes are provided stackedly.
Optionally, the vent pipe comprises a connection pipe segment and a ventilation and heat-dissipation pipe segment provided from top to bottom, wherein the connection pipe segment is configured to connect the breathing assembly with the oxygen generating assembly, and the ventilation and heat-dissipation pipe segment is configured to filter and cool the gas passing through.
Optionally, the breathing assembly comprises a mouth piece, a mouth piece radiator and a breathing hose sequentially communicated with each other, wherein the mouth piece radiator comprises a first vent, a heat radiation body, a heat radiation assembly and a second vent, the first vent and the second vent are provided on the heat radiation body, the mouth piece radiator communicates with the mouth piece and the breathing hose via the first vent and the second vent, and the heat radiation assembly is embedded in the heat radiation body for cooling the gas passing through.
Optionally, the oxygen generating agent tank comprises a tank body, of which the cross section is an ellipse;
The sealing edge structure of the tank body comprises a tank body cavity wall, a sealing glue and a tank body bottom wall, wherein the edge of the tank body bottom wall covers the edge of the tank body cavity wall and curls toward the mounting end of the breathing assembly, and the sealing glue is provided on a contact surface between the edge of the tank body cavity wall and the edge of the tank body bottom wall.
By the above technical solutions, the chemical oxygen self-rescue device of the invention can reduce breathing resistance, lower the temperature of breathed gas and improve the utilization rate of the oxygen generating agent.
Other characteristics and advantages of the invention will be illustrated in detail below by specific embodiments.
The drawings are given to provide a further understanding of the invention and form a part of the application to explain the invention together with the specific embodiments below, rather than limiting the scope of the invention. In the drawings:
Reference numerals in the drawings: 1: breathing assembly, 11: mouth piece plug, 12: mouth piece, 13: mouth piece radiator, 131: first vent, 132: heat radiation body, 133: heat radiation assembly, 134: second vent, 135: light reflecting plate, 14: oxygen candle connecting line, 15: breathing hose;
2: oxygen generating assembly, 21: oxygen generating agent tank, 211: vent pipe, 2111: connection pipe segment, 2112: ventilation and heat-dissipation pipe segment, 212: heat radiation frame, 2121: first heat radiation plate, 2122: second heat radiation plate, a: ventilation limit frame, b: heat radiation mesh, 213: oxygen generating agent, 214: gas bag connecting piece, 215: tank body, 2151: tank body cavity wall, 2152: sealing glue, 2153: tank body bottom wall, 22: oxygen candle, 23: gas discharge valve, 231: valve body, 232: valve seat, 233: spring, 234: valve core, 235: clamp, 236: rubber cover, 237: valve core pull-cord;
3: gas bag;
4: wearable heat-insulating assembly, 41: heat-insulating pad, 42: wearable belt.
Specific embodiments of the invention will be illustrated in detail below in conjunction with the drawings. It should be understood that, the specific embodiments described herein are merely provided for illustrating and explaining the invention, rather than limiting the scope of the invention.
In the invention, when no reversed illustration is given, the orientations used, for example, “above” and “below”, are generally defined by taking the map face of the corresponding drawings as a reference; “inner” and “outer” generally refer to the inner and outer of the outline of the corresponding component; “far” and “near” are defined by taking the map face of the corresponding drawings as a reference. “Cross-sectional area” is generally obtained by transecting along a transversally vertical direction taking the map face of the corresponding drawings as a reference.
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In conjunction with
For example, in a feasible preferred embodiment, the gas discharge valve 23 includes a valve body 231, a valve core 234, a valve seat 232, a spring 233 and a valve core pull-cord 237. The valve body 231 communicates the oxygen generating agent tank 21 with the atmosphere. The valve seat 232 is movably provided in the valve body 231. For example, the valve seat 232 may be connected with the valve body 231 via screw thread, thus the location of the valve seat 232 in the valve body 231 may be adjusted, and hence the degree the spring 233 rests against the valve core 234 may be adjusted. For example, the working effect of the gas discharge valve 23 may be adjusted by adjusting the screw pitch and amount of compression, etc., of the spring 233 so as to meet the requirement of different venting degrees of the agent tank. The valve core 234 is restricted on the valve seat 232 by the spring 233 for blocking the valve body 231, and the valve core 234 is connected with the inner wall of the gas bag 3 via the valve core pull-cord 237. For example, the valve body 231 is a cylindrical housing member. An annular rubber cover 236 is first provided at the connecting part between the valve body 231 and the tank body 215, the valve body 231 is socketed onto the rubber cover 236 and fixed by a clamp 235. The cross-sectional area of the part at which the valve body 231 communicates with the oxygen generating agent tank 21 is larger than the cross-sectional area of the part at which the valve body 231 communicates with the atmosphere, and the area blocked by the valve core 234 at the part where the valve body 231 communicates with the atmosphere is less than the cross-sectional area of the valve body 231 and is larger than the cross-sectional area of the part at which the valve body 231 communicates with the atmosphere. For example, the shape of the longitudinal section of the valve core 234 is similar to “T”. That is, the upper part of the valve core 234 is a discoid plugging body, and lower part of the valve core 234 is a columnar connecting body. The upper part of the valve core 234 blocks the part at which the valve body 231 communicates with the atmosphere, and the lower part of the valve core 234 passes through the valve seat 232 and is connected with the gas bag 3 via the valve core pull-cord 237. Preferably, the valve core pull-cord 237 passes through the oxygen generating agent tank 21 and is connected with the gas bag 3. In such a internal passing mode, it may be avoided that the valve body is opened accidentally due to external factors and interferences; instead, the opening and closing of the gas discharge valve can only be controlled by the expanding of the gas bag 3.
Preferably, the spring 233 is a spiral spring with a diameter enlarging gradually from the end part of the valve body 231 far away from the oxygen generating agent tank 21 to the end part of the valve body 231 close to the oxygen generating agent tank 21. Because the valve core 234 is connected to a soft valve core pull-cord 237, the displacement angle of the valve core 234 may deviate during drawing, so that the drawing movement of the valve core 234 may be not smooth. Therefore, it is preferred that the spring 233 used is a tower-shaped spiral spring shown in
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Preferably, in an embodiment of the invention, the heat radiation plate includes a ventilation limit frame a, and a plurality of heat radiation meshes b are provided stackedly in the ventilation limit frame a. For example, the ventilation limit frame a is a plate frame on which through holes are provided uniformly, the plate frame is filled with a mesh structure. On one hand, the plate frame restricts and loads the loose heat radiation mesh and thus defines the structure of the heat radiation frame 212; on the other hand, it may be adjusted flexibly according to the space arrangement in the oxygen generating agent tank 21, thus it may be guaranteed that each corner is filled with the heat radiation frame 212 for cooling the air passing through. The filter mesh plays the role of heat radiation and guiding, and the whole system functions to guide the air flow, lower the reaction rate and lower the temperature of the agent tank, etc. The structure has good consistency, a simple and effective structure and an excellent control effect.
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Based on the above technical solutions, the chemical oxygen self-rescue device according to the invention can lower the breathing resistance of the product (the standard for breathing resistance is: under the condition of 35 L/min, the sum of the inspiration resistance and the expiration resistance should not exceed 13 mbar, and the maximum breathing resistance in the experiment should not exceed 7.5 mbar), lower the breathing temperature (in a relative humidity of 30%, the inspired gas temperature should not exceed +60° C.; and for the relative humidity exceeding 30%, the temperature should not exceed +50° C.), meet the corresponding protective performance (in the nominal protective time, the content of CO2 in the inspired gas should not exceed 1.5%, and the maximum value should not exceed 3.0%) and be applicable for 30 min, 40 min, 50 min and 60 min self-rescue devices. The following shows the test data during R&D trial production. Performance tests are carried out on the chemical oxygen self-rescue device according to the invention, and the experimental results are shown by the experimental data in Table 1, Table 2, Table 3 and Table 4.
It may be seen from the experimental data in Tables 1˜4 that, the device of the invention can conform to the 30 min, 40 min, 50 min, 60 min-type self-rescue device and meet the requirement of oxygen concentration. No large fluctuation appears in the temperature of the breathed gas during the service time. At the same time, the breathing resistance and the like can meet the requirements.
Preferred embodiments of the invention have been described in detail above in conjunction with the drawings. However, the invention is not limited to the specific details of the above embodiments, various simple variations may be made to the technical solutions of the invention within the scope of technical ideas of the invention, and these simple variations all pertain to the protection scope of the invention.
Additionally, it should be noted that, each specific technical characteristics described in the above specific embodiments may be combined in any suitable mode in the case of no contradiction. In order to avoid unnecessary repetition, no further illustration will be given on various possible combinations.
In addition, various different embodiments of the invention may also be combined arbitrarily, so long as it does not depart from the concept of the invention. All these combinations should be regarded as the contents disclosed in the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201711482226.X | Dec 2017 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/111920 | 10/25/2018 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/128429 | 7/4/2019 | WO | A |
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| Number | Date | Country | |
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| 20200338371 A1 | Oct 2020 | US | |
| 20200338371 A1 | Oct 2020 | US |
