Pressure reducer with adjustable oxygen supply flow for self-rescuer for coal mine

Abstract

The utility model relates to the field of respiratory protection equipment, and discloses an oxygen supply flow adjustable pressure reducer for a self-rescuer for a coal mine, which comprises a valve body, a valve core, a valve sleeve, a valve cover, a high-pressure chamber, a medium-pressure chamber, an oxygen supply gas path penetrating through the high-pressure chamber to the medium-pressure chamber, and a high-pressure spring arranged in the high-pressure chamber, a manual supply valve is arranged in the medium-pressure chamber, the opening end of the oxygen supply gas path comprises a gas inlet end and an output end, a first filter screen is fixedly arranged in the gas inlet end, and a safety exhaust valve and an automatic supply valve are fixedly arranged in the output end; the adjusting assembly is used for adjusting the oxygen supply flow in the oxygen supply gas path and comprises a rotating shaft mounted in the valve sleeve and a shifting piece fixedly connected with the rotating shaft; an oxygen supply vent hole I and an oxygen supply vent hole II which have different apertures and are used for being communicated with an oxygen supply gas path are formed in the rotating shaft; according to the scheme, the oxygen supply requirements under different working conditions can be met at the same time, and a safer working environment is provided for coal mine operation of coal miners.

Description

Technical Field

[0001] The utility model relates to the field of respiratory protection equipment, in particular to a pressure reducer with adjustable oxygen supply flow for a self-rescuer used in coal mines. Background Art

[0002] The isolated compressed oxygen self-rescuer for coal mines (hereinafter referred to as: self-rescuer) is a respiratory protective equipment that underground workers must wear. It can effectively protect underground workers from toxic and harmful gas pollution and oxygen deficiency and asphyxiation disasters and safely evacuate the disaster area. It is the last line of defense for the life safety of underground workers. Self-rescuer is generally composed of oxygen tanks, pressure reducers, air bags, air guide tubes, mouthpieces, back belts and other components. Figure 6 and Figure 7 As shown, the general usage process is to first turn on the switch 131 on the oxygen tank 13 to fill the air bag 14 with oxygen, and then inhale and exhale with the mouth through the mouthpiece.

[0003] Accidents in coal mines are usually sudden and unpredictable. When underground workers wear self-rescuers for emergency avoidance, they often need to exercise, climb, crawl, etc. to escape the disaster area, which consumes a lot of oxygen. Therefore, a large-flow oxygen supply mode is needed to provide the wearer with the amount of oxygen needed for walking or exercising; when the disaster location is far away from the ground wellhead and the protection time of the self-rescuer is not enough for the wearer to transfer safely, the evacuees should choose permanent refuge chambers, temporary refuge chambers, mobile lifeboats, self-rescuer transition stations and other facilities and equipment nearby to sit and wait for help. At this time, the wearer consumes less oxygen, so a small-flow oxygen supply mode is needed.

[0004] However, the current self-rescuers used for underground operations do not take into account the different oxygen supply needs of coal miners when they are sitting or exercising. The direct impact of this is that when the self-rescuer is actually worn, the rated protection time requirements can be met under the sitting and waiting for rescue conditions, but the actual protection time is easily insufficient due to the increased oxygen consumption under the exercise and escape conditions. Utility Model Content

[0005] The utility model aims to provide a pressure reducer with adjustable oxygen supply flow for a self-rescuer used in coal mines, which can simultaneously meet the oxygen supply requirements of coal miners under different working conditions.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] 14. The air filter assembly of claim 13, wherein the air filter is secured to a lip of the air filter cartridge and is secured to a lip of the air filter cartridge in a secure position relative to the air filter cartridge. The air filter cartridge, when in use, is secured to a lip of the air filter cartridge in a secure position relative to the air filter cartridge. The air filter cartridge, when in use, is secured to a lip of the air filter cartridge in a secure position relative to the air filter cartridge.

[0008] Beneficial effects:

[0009] 1. Adjustable oxygen supply under different working conditions while maintaining a compact overall structure, facilitating self-rescue efforts in coal mines: Dynamically adjusting oxygen supply, rationally allocating limited oxygen resources, and ensuring the safety of workers working in the mine: By providing two oxygen vents (one and two) of varying diameters on the rotating shaft, this design dynamically adjusts the oxygen flow within the oxygen supply circuit, ensuring that miners' oxygen needs are met appropriately under varying conditions. The larger aperture of Oxygen Vent One accommodates the high oxygen demands of workers in motion, ensuring adequate oxygen supply during intense labor and preventing fatigue and health problems caused by hypoxia. The smaller aperture of Oxygen Vent Two accommodates the low oxygen demands of workers at rest, ensuring an appropriate oxygen supply during these conditions and avoiding the waste and unnecessary stress caused by excessive oxygen supply. This dynamic adjustment not only improves mine operations efficiency but also ensures the health and safety of workers, buying more time for them to escape the disaster site and await rescue. A paddle is installed at the middle section of the valve sleeve, i.e. the small-diameter end, so that the structure of the pressure reducer is more compact, thereby reducing the overall volume of the self-rescuer and making it easier to carry.

[0010] 2、Two-stage pressure regulation ensures stable operation of the pressure reducer under different conditions: the high-pressure chamber and the medium-pressure chamber are set up, and the high-pressure spring and the medium-pressure spring are used in combination to achieve two-stage regulation of the gas pressure. The high-pressure spring in the high-pressure chamber can provide preliminary pressure reduction when high-pressure gas enters the pressure reducer, ensuring that the gas pressure is effectively controlled before entering the medium-pressure chamber. The medium-pressure spring in the medium-pressure chamber further adjusts the gas pressure to ensure that the output gas pressure is stable within a safe range. This two-stage pressure regulation design not only improves the stability and reliability of the system, but also prolongs the service life of the pressure reducer, reducing the risk of self-rescuer equipment failure and safety hazards caused by pressure fluctuations.

[0011] At the same time, the automatic supply valve and the manual supply valve are set up in the pressure reducer, providing double protection for the internal oxygen supply environment of the pressure reducer and ensuring the reliability and safety of oxygen supply under different conditions. The automatic supply valve can automatically adjust the supply amount according to system requirements, ensuring that the pressure output by the pressure reducer is always stable. In the moving state, the oxygen supply amount is greatly increased, and the response speed of the automatic supply valve may be slower, so the manual supply valve can be used for rapid adjustment to ensure that workers receive sufficient oxygen supply in emergency situations. In the stationary state, the oxygen demand is small, and the internal pressure environment is mainly adjusted by the automatic supply valve, simplifying the operation and saving energy so that workers can wait for rescue. This double protection design not only improves the reliability and safety of the oxygen supply system, but also ensures stable operation under various working conditions.

[0012] Preferably, as an improvement, the area of the first oxygen supply vent is ≥3 times the area of the second oxygen supply vent.

[0013] Beneficial effect: The area of the first oxygen supply vent is not arbitrarily set to be ≥3 times the area of the second oxygen supply vent, but is based on scientific evidence from human physiology and engineering. Studies have shown that the oxygen demand of a person in a moving state is usually 3 to 4 times that in a stationary state. Therefore, the area of the first oxygen supply vent is designed to be at least 3 times that of the second oxygen supply vent, ensuring that the oxygen demand under different conditions is reasonably met. This design not only meets the physiological needs of the human body, but also provides stable oxygen supply under different working conditions.

[0014] Preferably, as an improvement, the automatic supply valve comprises a plunger, a quantitative diaphragm, and a second filter screen connected in sequence, and the quantitative diaphragm is an elastic element.

[0015] Beneficial effects: The role of the automatic replenishment valve is to automatically adjust the replenishment according to the internal environment of the pressure reducer, to ensure that the pressure output of the pressure reducer is always stable, and the quantitative diaphragm acts as an elastic element, which can produce corresponding deformation under different pressures. When the system pressure drops, the deformation of the quantitative diaphragm will cause the plunger to move downward, thereby opening the replenishment channel, allowing gas to enter the pressure reducer through the filter screen two. This design ensures the accuracy and timeliness of the replenishment process, avoiding errors and delays caused by manual adjustment.

[0016] Preferably, as an improvement, the safety exhaust valve comprises an adjusting screw screwed with the valve sleeve, a gasket fixedly connected with the end of the adjusting screw, and an exhaust spring sleeved on the end of the adjusting screw, and a through hole is arranged in the center of the adjusting screw.

[0017] Beneficial effects: The role of the safety exhaust valve is to automatically open and release pressure when the internal pressure of the pressure reducer exceeds the preset value, ensuring that the system pressure is always within a safe range. The threaded connection of the adjusting screw and the valve sleeve allows the opening pressure of the safety exhaust valve to be accurately adjusted by the depth of the adjusting screw. When the internal pressure exceeds the set value, the gasket is pushed away, and the gas is discharged through the through hole in the center of the adjusting screw, effectively preventing damage to the self-rescuer or safety accidents caused by excessive pressure. The design of the spring provides a constant pre-tightening force at the end of the adjusting screw, ensuring the tight contact between the gasket and the valve seat. This design not only improves the response speed of the safety exhaust valve, but also ensures that the safety exhaust valve can remain closed under normal working pressure to prevent oxygen leakage. The pre-tightening force of the spring can also be adjusted according to actual needs to ensure stable operation of the system under different working conditions.

[0018] Preferably, as an improvement, a trapezoidal groove is arranged on the outer side of the valve sleeve.

[0019] Beneficial effects: The trapezoidal groove provides an accurate clamping position for the outer side of the valve sleeve, allowing the air bag to form a stable mechanical lock with the pressure reducer in a clamped manner, effectively preventing the air bag from loosening or falling off due to external forces or vibrations during use, preventing oxygen leakage and helping users to escape.

[0020] Preferably, as an improvement, a sealing groove one is formed on one side of the valve body near the air inlet end, and an O-shaped sealing ring one is embedded in the sealing groove one.

[0021] Beneficial effects: After the O-ring is embedded in the sealing groove, it can form a tight sealing barrier between the oxygen cylinder and the pressure reducer, effectively preventing loosening and leakage caused by external force or vibration. The O-ring has excellent elasticity and sealing performance, and can fill the tiny gap between the valve body and the oxygen cylinder when compressed, effectively preventing leakage and waste of oxygen, which is conducive to creating more time for users to escape.

[0022] Preferably, as an improvement, a plurality of sealing grooves 2 are provided on the periphery of the valve core, and O-rings 2 are embedded in the sealing grooves 2.

[0023] Beneficial Effects: The design of the second sealing groove creates multiple arc-shaped openings around the valve core. These grooves provide precise installation locations for the second O-ring. Once inserted into the second sealing groove, the second O-ring forms a multi-layer sealing barrier between the valve core and the valve body, effectively preventing loosening and displacement caused by external forces or vibration. This multi-point contact design increases friction between the valve core and the valve body, ensuring a tight fit during use and improving the overall structural stability of the pressure reducer.

[0024] Preferably, as an improvement, a strip hole is opened on the valve sleeve, a groove is opened on the rotating shaft, the paddle passes through the strip hole and is threadedly connected to the groove on the rotating shaft, and when the paddle is moved to the extreme position of the strip hole, the oxygen supply vent hole 1 or the oxygen supply vent hole 2 connects the oxygen supply path.

[0025] Beneficial effects: First, by providing strip holes on the valve sleeve, the positions of oxygen vent hole 1 and oxygen vent hole 2 can be clearly defined. The design of the strip holes ensures that the paddle always moves along the predetermined path during movement, avoiding the problem of the oxygen vent holes not being accurately aligned due to position deviation. This precise positioning effect not only improves the reliability of the system, but also ensures the smooth connection of the oxygen supply circuit. Especially in emergency situations, it can quickly and accurately switch the oxygen supply circuit between the moving state and the stationary state, ensuring that the oxygen supply needs of coal miners are met in a timely manner and safety is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view of the first embodiment of the present utility model;

[0027] Figure 2 for Figure 1 Schematic diagram of the structure of the middle regulating component;

[0028] Figure 3 for Figure 2 AA section view;

[0029] Figure 4 for Figure 1 Front view of the middle valve sleeve;

[0030] Figure 5 For Figure 1 Enlarged view of B position;

[0031] Figure 6 For the assembly diagram of the pressure reducer and the oxygen tank;

[0032] Figure 7 For the assembly diagram of the pressure reducer and the air bag;

[0033] Figure 8 For Figure 7 Enlarged view of C position. DETAILED DESCRIPTION

[0034] Further details are described below through specific embodiments:

[0035] The reference signs in the drawings of the specification include: valve body one 1, valve core 2, valve cover 3, valve sleeve 4, large diameter end 41, small diameter end 42, trapezoidal groove 43, wedge-shaped steep slope 44, high-pressure spring 5, manual makeup valve 6, valve body two 61, medium-pressure spring 62, sealing body 63, valve stem 64, ball head 65, filter screen one 7, safety exhaust valve 8, adjusting screw 81, gasket 82, automatic makeup valve 9, plunger 91, conical groove 911, metering diaphragm 92, filter screen two 93, adjusting assembly 10, rotating shaft 101, tab 102, oxygen supply vent one 103, oxygen supply vent two 104, safety valve vent 105, strip-shaped hole 106, O-shaped sealing ring one 11, O-shaped sealing ring two 12, oxygen tank 13, switch 131, air bag 14.

[0036] Example one is basically as shown in the accompanying Figure 1 - the accompanying Figure 6 :

[0037] A pressure reducer for adjusting the oxygen supply flow of a self-rescuer for coal mines, comprising a valve body one 1, a valve core 2, a valve cover 3, and a valve sleeve 4, a high-pressure chamber and a medium-pressure chamber are sequentially and communicatively arranged inside the valve body one 1 according to the oxygen flow direction, and an oxygen supply path is arranged through the high-pressure chamber to the medium-pressure chamber, the oxygen supply path refers to a channel (i.e. the position marked with a thick solid line arrow) arranged at the center position of the valve core 2, a high-pressure spring 5 is arranged in the high-pressure chamber, a manual makeup valve 6 is arranged in the medium-pressure chamber, the opening end of the oxygen supply path includes an air inlet end and an output end, a filter screen one 7 is fixedly arranged in the air inlet end, a safety exhaust valve 8 and an automatic makeup valve 9 are respectively fixedly arranged in the output end, an adjusting assembly 10 for adjusting the oxygen supply flow in the oxygen supply path is rotatably arranged at the center position of the oxygen supply path, the overall structure is compact, the whole machine is light in weight, which is conducive to reducing the weight of the wearer, the adjusting assembly 10 is arranged outside the air bag and located directly above the whole pressure reducer, which is visible when the wearer bends down, which is conducive to checking the oxygen supply mode at this time and facilitating operation.

[0038] The manual supply valve 6 includes a second valve body 61, which is a piston. The second valve body 61 and the valve cavity enclose a medium-pressure chamber, which is connected to the high-pressure chamber through a channel. The medium-pressure chamber is provided with a medium-pressure spring 62, a sealing body 63 fixedly connected to the medium-pressure spring 62, and a valve stem 64 in contact with the sealing body 63. A ball head 65 is threadedly connected to the end of the valve stem 64 away from the medium-pressure spring 62. When the valve stem 64 of the manual supply valve 6 is squeezed by an external force, such as Figure 1 When pushed to the left as shown, the valve stem 64 drives the sealing body 63 away from the valve body 2 61, so that oxygen can be Figure 1 The thick solid arrow indicates the direction of oxygen flow from the oxygen supply path through the channel opened in the center of valve stem 64 and out of the pressure reducer, enabling manual oxygen resupply. As valve stem 64 is pushed leftward, intermediate-pressure spring 62 is compressed and deformed. When the force on the push rod is removed, intermediate-pressure spring 62 returns to its initial state, and valve stem 64 returns to its initial position. Valve stem 64 then drives sealing element 63 to reseal valve body 2 61, preparing for the next manual oxygen resupply.

[0039] The automatic replenishment valve 9 adopts a pneumatic balance structure, including Figure 1 The valve cavity shown is fixedly connected from right to left in sequence with the plunger 91, the quantitative diaphragm 92, and the second filter 93. The function of the second filter 93 is to prevent impurities from flowing out and damaging the user's respiratory system. The quantitative diaphragm 92 is an elastic element. In this embodiment, it is made of elastic rubber material. The plunger 91 and the valve core 2 slide together and fix and press the quantitative diaphragm 92 and the second filter 93 in the initial state. The automatic supply valve 9 is based on the principle of pressure difference. The plunger 91 is used to withstand the internal pressure of the pressure reducer and the air bag 14. The opening and closing of the valve is automatically adjusted according to the pressure difference formed between the two to achieve automatic oxygen supply. The side of the plunger 91 close to the quantitative diaphragm 92 is a small diameter section, and the other side is a large diameter section. There is a gap between the small diameter section and the valve cavity in the circumference. Combined with Figure 6 and Figure 7As shown, for example, when the amount of oxygen in the airbag 14 is insufficient and the air pressure is at a low level, the oxygen in the oxygen supply path passes through the filter screen 93 and the through hole in the center of the quantitative diaphragm 92 in sequence and acts on the end of the plunger 91 close to the quantitative diaphragm 92, causing the plunger 91 to move to the right relative to the pressure reducer as a whole. It is worth noting that a conical groove 911 is provided on the plunger 91 near the center of the quantitative diaphragm 92 to increase the contact area between the oxygen and the plunger 91, so that the response speed of the plunger 91 is faster, until the valve cavity of the automatic supply valve 9 is exposed to the internal environment of the airbag 14. At this time, oxygen flows into the airbag 14 from the oxygen supply path, so as to achieve the effect of automatic replenishment of oxygen in time when there is no oxygen or the amount of oxygen is insufficient in the airbag 14. When the oxygen amount in the airbag 14 reaches saturation or the oxygen in the oxygen tank 13 is used up, the plunger 91 is reset under the influence of the rebound of the quantitative diaphragm 92. It is worth mentioning that the dual oxygen supply mechanism of the automatic supply valve 9 and the manual supply valve 6 ensures the reliability and safety of oxygen supply, and can ensure the user's breathing safety when there is a sudden increase in labor intensity or problems with the automatic supply system.

[0040] An exhaust chamber, or passageway within the valve sleeve 4 (marked by a dotted arrow), is defined on the end of the valve sleeve 4 away from the valve body 1. The safety exhaust valve 8 comprises an adjusting screw 81 threadedly connected to the valve sleeve 4 within the exhaust chamber, a gasket 82 fixedly connected to the end of the adjusting screw 81, and an exhaust spring 83 sleeved onto the stem of the adjusting screw 81. The ends of the exhaust spring 83 are fixedly connected to the adjusting screw 81 and the gasket 82, respectively. A through-hole is provided in the center of the adjusting screw 81. The operating principle of the safety exhaust valve 8 is based on pressure balance and spring force. Under normal operating conditions, a tightened adjusting screw 81 ensures that the safety exhaust valve 8 is closed. When the pressure within the pressure reducer exceeds a safety threshold, the gasket 82 is pushed to the right, compressing the exhaust spring 83. The exhaust passageway opening in the center of the adjusting screw communicates with the exhaust passageway within the pressure reducer, allowing the high-pressure gas within the pressure reducer to be partially released, reducing the pressure within the pressure reducer to normal levels. The exhaust passageway opening is finally closed again by the rebound action of the exhaust spring 83. It is worth noting that the pressure response standard of the safety exhaust valve 8 should be higher than that of the automatic supply valve 9, that is, the safety exhaust valve 8 will only be activated in an emergency, which can be achieved by assembling an exhaust spring 83 with a high elastic coefficient.

[0041] The regulating assembly 10 includes a rotating shaft 101 sleeved on the groove in the middle of the valve core 2, and a paddle 102 fixedly connected to the rotating shaft 101; the valve sleeve 4 includes a large-diameter end 41 at both ends and a small-diameter end 42 in the middle, and the paddle 101 is installed on the small-diameter end 42. An oxygen supply vent hole 103 and an oxygen supply vent hole 2 104 with different apertures for connecting the oxygen supply path are provided on the paddle 101, wherein the diameter of the oxygen supply vent hole 103 is 0.6 mm, and the diameter of the oxygen supply vent hole 2 104 is 0.3 mm. A safety valve vent hole 105 is also provided on the paddle 102. The safety valve vent hole 105 is used to communicate with the input end of the safety exhaust valve 8, and the other end of the safety valve vent hole 105 can be connected to the input end of the safety exhaust valve 8. Figure 1 As shown, the internal channel of the valve sleeve 4 located on the left side of the safety exhaust valve 8 is connected, and the entrance of the channel is designed to be an arc-shaped opening. The safety valve vent 105 always corresponds to the arc-shaped opening range during the rotation process. No matter what oxygen supply mode is in, that is, what position the paddle 102 is moved to, it can ensure communication with the safety valve vent 105. A wedge-shaped steep slope 44 is provided on the inner wall of the valve sleeve 4 near the above-mentioned arc-shaped opening, so that the high-pressure oxygen can flow into the internal channel on the left side of the safety exhaust valve 8 more smoothly, reducing the impact force of the high-pressure oxygen on the inner wall of the valve sleeve 4 in an emergency. A strip hole 106 with a length of 10 mm and a width of 2 mm is formed along the circumferential direction of the outer wall of the valve sleeve 4. A groove is formed on the rotating shaft 101. The paddle 102 passes through the strip hole 106 and is threadedly connected to the groove on the rotating shaft 101. When the paddle 102 is moved to the left or right extreme positions of the strip hole 106, the oxygen supply vent hole 103 or the oxygen supply vent hole 2 104 connects to the oxygen supply circuit. In this embodiment, when the paddle 102 is moved to the left extreme position, the oxygen supply vent hole 103 is connected to the oxygen supply circuit in the motion state. In practice, the oxygen supply flow rate at this time is ≥2.1 L / min. Conversely, when the paddle 102 is moved to the right extreme position, the oxygen supply vent hole 2 104 is connected to the oxygen supply circuit in the sitting state. In practice, the oxygen supply flow rate at this time is ≥0.5 L / min.

[0042] A trapezoidal groove 43 is provided on the outside of the valve sleeve 4. Figure 5 As shown, an annular clamp is provided at the opening of the airbag 14, which is inserted into the trapezoidal groove 43 to achieve a fixed connection between the airbag 14 and the pressure reducer. A sealing groove with an inner diameter of 10mm, an outer diameter of 14mm and a depth of 1.25mm is provided on the outer side of the valve body near the air inlet end. Figure 1 As shown, an O-type sealing ring 11 is embedded in the sealing groove 1. Several sealing grooves 2 are opened on the periphery of the valve core 2, and O-type sealing rings 2 12 are embedded in the sealing grooves 2.

[0043] The actual application process is as follows:

[0044] When in use, oxygen flows to Figure 1As shown by the arrow, after the oxygen in the oxygen tank 13 enters the valve body 1, it flows from the high pressure chamber to the medium pressure chamber through the oxygen supply route. Figure 1 As shown by the thick solid arrow, the oxygen flowing into the medium pressure chamber flows out of the automatic supply valve 9 to the air bag 14 first. That is, under normal circumstances, the automatic supply valve 9 can automatically replenish oxygen in time when there is no oxygen or the oxygen amount in the air bag 14 is insufficient. When the automatic supply valve 9 fails or the user thinks that the oxygen outflow speed is too slow and needs to inhale oxygen urgently, the manual supply valve 6 is manually operated to manually replenish oxygen, that is, by pressing the ball head 65 and the valve stem 64, as shown in FIG. Figure 1 As shown by the thin solid arrow, the oxygen in the medium pressure chamber can quickly flow out to the airbag 14. The function of the safety exhaust valve 8 is to protect the internal pressure environment of the pressure reducer. When the internal pressure of the pressure reducer exceeds the safety threshold, the safety exhaust valve 8 will automatically open. Figure 1 As shown by the dotted arrow, the oxygen inside the pressure reducer can be quickly discharged to the airbag 14, ensuring that the system pressure is always within a safe range, avoiding the problem of the pressure reducer failing due to excessive internal pressure, and facilitating the safe transfer of the wearer.

[0045] It is worth mentioning that the person wearing the self-rescuer can rotate the paddle 102 at any time to switch the oxygen supply mode during use. The initial state of the self-rescuer is the static state by default. At this time, the paddle 102 is located at the right extreme position, and the oxygen supply vent 2 104 on the paddle 102 is connected to the oxygen supply circuit. After practice, the oxygen supply flow rate at this time is about 0.5L / min. When the user needs to move his position and is in motion, the oxygen supply demand increases. At this time, the paddle 102 can be rotated to the left extreme position. At this time, the oxygen supply vent 1 103 is connected to the oxygen supply circuit. After practice, the oxygen supply flow rate at this time is about 2.1L / min.

[0046] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pressure reducer with adjustable oxygen flow for a coal mine self-rescuer, characterized by: The valve comprises a valve body, a valve core, a valve sleeve, and a valve cover. A high-pressure chamber and a medium-pressure chamber are sequentially provided inside the valve body according to the direction of oxygen flow. An oxygen supply path is provided running from the high-pressure chamber to the medium-pressure chamber. A high-pressure spring is provided in the high-pressure chamber, and a manual replenishing valve is provided in the medium-pressure chamber. The manual replenishing valve comprises a medium-pressure spring and a valve stem fixedly connected to the medium-pressure spring. The open end of the oxygen supply path comprises an air inlet end and an air outlet end. A filter screen is fixedly provided in the air inlet end, and a safety exhaust valve and an automatic replenishing valve are respectively fixedly provided in the air outlet end. The valve sleeve comprises a small-diameter end and large-diameter ends located on both sides of the small-diameter end. It also includes an adjusting component for adjusting the oxygen supply flow in the oxygen supply circuit, and the adjusting component includes a rotating shaft sleeved on the small-diameter end and a paddle fixedly connected to the rotating shaft; oxygen supply vent hole 1 and oxygen supply vent hole 2 with different apertures for connecting to the oxygen supply circuit are opened on the rotating shaft, and a safety valve vent hole is opened at the same time to connect to the input end of the safety exhaust valve.

2. The oxygen supply flow adjustable pressure reducer for a coal mine self-rescuer according to claim 1, characterized in that: The area of ​​the first oxygen supply vent hole is ≥ 3 times the area of ​​the second oxygen supply vent hole.

3. The oxygen supply flow adjustable pressure reducer for a coal mine self-rescuer according to claim 2, characterized in that: The automatic replenishing valve comprises a plunger, a quantitative diaphragm and a filter screen which are fixedly connected in sequence, and the quantitative diaphragm is an elastic element.

4. The oxygen flow rate adjustable pressure reducer for a coal mine self-rescuer according to claim 3, characterized in that: The safety exhaust valve includes an adjusting screw threadedly connected to the valve body, a gasket abutting the end of the adjusting screw, and an exhaust spring sleeved on the end of the adjusting screw. A through hole is provided in the center of the adjusting screw.

5. The oxygen supply flow adjustable pressure reducer for a coal mine self-rescuer according to claim 4, characterized in that: A trapezoidal groove is provided on the outer side of the valve body.

6. The oxygen supply flow adjustable pressure reducer for a coal mine self-rescuer according to claim 5, characterized in that: A sealing groove 1 is provided on one side of the periphery of the valve body close to the air inlet end, and an O-type sealing ring 1 is embedded in the sealing groove 1.

7. The oxygen flow rate adjustable pressure reducer for a coal mine self-rescuer according to claim 6, characterized in that: A plurality of sealing grooves 2 are provided on the periphery of the valve core, and O-type sealing rings 2 are embedded in the sealing grooves 2.

8. The oxygen supply flow adjustable pressure reducer for a coal mine self-rescuer according to claim 7, characterized in that: A strip hole is provided on the valve sleeve, a groove is provided on the rotating shaft, the paddle passes through the strip hole and is threadedly connected to the groove on the rotating shaft, and when the paddle is moved to the extreme position of the strip hole, the oxygen supply vent hole 1 or the oxygen supply vent hole 2 connects the oxygen supply path.

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