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

Abstract

The invention relates to the field of respiratory protection equipment, and discloses an oxygen supply flow adjustable pressure reducer for a coal mine self-rescuer, which comprises a valve body, a valve core, a valve sleeve, a valve cover, a high-pressure chamber and a medium-pressure chamber arranged in the valve body, an oxygen supply gas path penetrating through the high-pressure chamber to the medium-pressure chamber, a high-pressure spring arranged in the high-pressure chamber, and a manual supply valve 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 invention relates to the field of respiratory protection equipment, and in particular to a pressure reducer with adjustable oxygen supply flow for a self-rescuer for 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 hypoxia suffocation disasters and safely evacuate the disaster area. It is the last line of defense for the life safety of underground workers. Self-rescuers are generally composed of oxygen tanks, pressure reducers, air bags, air guide tubes, mouthpieces, back belts and other parts. Figure 5 and Figure 6 As shown, the use process generally involves first turning on the switch 131 on the oxygen tank 13 to allow the oxygen to fill the air bag 14, and then inhaling and exhaling 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 from the disaster area, which consumes a lot of oxygen. Therefore, a large-flow oxygen supply mode is needed to provide the wearers with the amount of oxygen they need for walking or exercising. When the disaster site is far away from the wellhead on the ground and the protection time of the self-rescuer is not enough for the wearers 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 wearers consume 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 requirement can be met under the condition of sitting and waiting for rescue, but the actual protection time is easily insufficient due to the increased oxygen consumption under the condition of exercising and escaping. Summary of the invention

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

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A pressure reducer with adjustable oxygen supply flow for a self-rescuer for coal mines, comprising a valve body, a valve core, a valve sleeve, and a valve cover. A high-pressure chamber and a medium-pressure chamber are sequentially opened inside the valve body according to the oxygen flow direction, and an oxygen supply path running through the high-pressure chamber to the medium-pressure chamber is arranged at the same time. A high-pressure spring is arranged in the high-pressure chamber, and a manual replenishing valve is arranged 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 output end. A filter screen 1 is fixedly arranged in the air inlet end, and a safety exhaust valve and an automatic replenishing valve are respectively fixedly arranged in the output end. The valve sleeve comprises a small-diameter end and large-diameter ends located on both sides of the small-diameter end; it also comprises an adjusting component for adjusting the oxygen supply flow in the oxygen supply path, the adjusting component comprises a rotating shaft sleeved on the small-diameter end, and a paddle fixedly connected to the rotating shaft; oxygen supply vent holes 1 and 2 with different apertures for connecting the oxygen supply path are arranged on the rotating shaft, and a safety valve vent hole is arranged to communicate with the input end of the safety exhaust valve.

[0008] Beneficial effects:

[0009] 1. The oxygen supply can be adjusted under different working conditions, while ensuring the overall structure is compact, which is conducive to self-rescue in coal mines: dynamically adjust the oxygen supply, reasonably allocate limited oxygen resources, and ensure the safety of workers' coal mine operations: by opening oxygen supply vents 1 and 2 with different apertures on the rotating shaft, the design can dynamically adjust the oxygen supply flow in the oxygen supply circuit to ensure that the oxygen supply needs of coal miners in different states are reasonably met. The aperture of oxygen supply vent 1 is larger, which is suitable for the high oxygen supply demand of workers in motion, ensuring that workers get enough oxygen supply during high-intensity labor and avoiding fatigue and health problems caused by hypoxia. The aperture of oxygen supply vent 2 is smaller, which is suitable for the low oxygen supply demand of workers in a static state, ensuring a moderate oxygen supply in a static state, and avoiding waste and unnecessary pressure caused by excessive oxygen supply. This dynamic adjustment function not only improves the efficiency of mine operations, but also ensures the health and safety of workers, and buys more time for workers to escape from the disaster site and wait for 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 setting of the high-pressure chamber and the medium-pressure chamber, as well as the coordinated use of the high-pressure spring and the medium-pressure spring, realizes the two-stage regulation of the gas pressure. The high-pressure spring in the high-pressure chamber can provide a preliminary pressure reduction effect when the 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 pressure of the output gas is stable within a safe range. This two-stage pressure regulation design not only improves the stability and reliability of the system, but also extends the service life of the pressure reducer and reduces the failure of the self-rescuer equipment and safety hazards caused by pressure fluctuations.

[0011] At the same time, both an automatic replenishment valve and a manual replenishment valve are set in the reducer to provide double protection for the internal oxygen supply environment of the reducer, ensuring the reliability and safety of oxygen supply under different circumstances. The automatic replenishment valve can automatically adjust the replenishment amount according to system requirements to ensure that the pressure output by the reducer is always stable. In the moving state, the oxygen supply is greatly increased. At this time, the response speed of the automatic replenishment valve may be slow. The manual replenishment valve can be used for quick adjustment to ensure that workers get enough oxygen supply in an emergency. In the static state, the demand for oxygen supply is small, and the internal pressure environment is mainly adjusted by the automatic replenishment valve, which simplifies the operation and saves 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 oxygen supply vent hole one is ≥ 3 times the area of ​​the oxygen supply vent hole two.

[0013] Beneficial effect: The area of ​​oxygen vent 1 is ≥ 3 times that of oxygen vent 2. It is not set arbitrarily, but is based on the scientific basis of human physiology and engineering. Studies have shown that the oxygen demand of people in motion is usually 3 to 4 times that of static state. Therefore, the area of ​​oxygen vent 1 is designed to be at least 3 times that of oxygen vent 2, which can ensure that the oxygen supply demand in different states is reasonably met. This design not only meets the physiological needs of the human body, but also can provide a stable oxygen supply effect under different working conditions.

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

[0015] Beneficial effects: The function of the automatic replenishment valve is to automatically adjust the replenishment amount according to the internal environmental requirements of the pressure reducer to ensure that the pressure output by the pressure reducer is always stable. The quantitative diaphragm, as an elastic element, 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 and allowing the gas to enter the pressure reducer through the filter screen 2. This design ensures the accuracy and timeliness of the replenishment process and avoids errors and delays caused by manual adjustment.

[0016] Preferably, as an improvement, the safety exhaust valve includes an adjusting screw threadedly connected to the valve sleeve, a gasket fixedly connected to the end of the adjusting screw, an exhaust spring sleeved on the end of the adjusting screw, and a through hole is arranged at the center of the adjusting screw.

[0017] Beneficial effects: The function of the safety exhaust valve is to automatically open and release the 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 between the adjusting screw and the valve sleeve allows the opening pressure of the safety exhaust valve to be precisely adjusted by the screw-in depth of the adjusting screw. When the internal pressure exceeds the set value, the gasket is pushed open 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 preload at the end of the adjusting screw, ensuring close 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 preload of the spring can also be adjusted according to actual needs to ensure that the system can maintain a stable operating state under different working conditions.

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

[0019] Beneficial effect: The trapezoidal groove provides a precise snap-in position for the outside of the valve sleeve, so that the airbag can be firmly snap-fitted to the pressure reducer to form a stable mechanical lock, effectively preventing the airbag from loosening or falling off due to external force or vibration during use. It is an important design to prevent oxygen leakage and help users escape from trouble.

[0020] Preferably, as an improvement, 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-ring 1 is embedded in the sealing groove 1.

[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 effect: The design of the second sealing groove forms multiple arc-shaped openings on the periphery of the valve core, and these grooves provide precise installation positions for the second O-ring. After the second O-ring is embedded in the second sealing groove, it can form multiple sealing barriers between the valve core and the valve body, effectively preventing loosening and displacement caused by external force or vibration. This multi-point contact design increases the friction between the valve core and the valve body, ensures the close fit between the two during use, and improves the connection stability of the overall structure 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 opening a strip hole on the valve sleeve, the positions of oxygen supply vent hole 1 and oxygen supply vent hole 2 can be clearly defined. The design of the strip hole ensures that the paddle always moves along the predetermined path during movement, avoiding the problem of the oxygen supply vent hole 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 an emergency, it can quickly and accurately switch the oxygen supply circuit in 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 is a cross-sectional view of the first embodiment of the present invention;

[0027] Figure 2 for Figure 1 The structural diagram of the middle regulating component;

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

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

[0030] Figure 5 for Figure 1 A magnified schematic diagram of position B in the middle;

[0031] Figure 6 This is a schematic diagram of the assembly of the pressure reducer and the oxygen tank;

[0032] Figure 7 The figure is a schematic diagram of the assembly of the pressure reducer and the air bag;

[0033] Figure 8 for Figure 7 Enlarged schematic diagram of the C position in the middle. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: valve body 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 supply valve 6, valve body 2 61, medium pressure spring 62, sealing body 63, valve stem 64, ball head 65, filter screen 1 7, safety exhaust valve 8, adjusting screw 81, gasket 82, automatic supply valve 9, plunger 91, conical groove 911, quantitative diaphragm 92, filter screen 2 93, adjustment assembly 10, rotating shaft 101, paddle 102, oxygen supply vent hole 1 103, oxygen supply vent hole 2 104, safety valve vent hole 105, strip hole 106, O-ring 1 11, O-ring 2 12, oxygen tank 13, switch 131, airbag 14.

[0036] Embodiment 1 is basically as shown in the attached Figure 1 -Attached Figure 6 As shown:

[0037] A pressure reducer with adjustable oxygen supply flow for a self-rescuer for coal mines, comprising a valve body 1, a valve core 2, a valve cover 3, and a valve sleeve 4. A high-pressure chamber and a medium-pressure chamber are opened and connected in sequence inside the valve body 1 according to the oxygen flow direction, and an oxygen supply path running through the high-pressure chamber to the medium-pressure chamber is provided. The oxygen supply path refers to a channel opened at the center position of the valve core 2 (i.e., the position marked with a thick solid arrow). A high-pressure spring 5 is provided in the high-pressure chamber, and a manual replenishing valve 6 is provided in the medium-pressure chamber. The open end of the oxygen supply path comprises an air inlet end and an output end. A filter screen 7 is fixedly provided in the air inlet end, and a safety exhaust valve 8 and an automatic replenishing valve 9 are respectively fixedly provided in the output end. An adjusting component 10 for adjusting the oxygen supply flow in the oxygen supply path is rotatably provided at the center position of the oxygen supply path. The overall structure is compact and the overall weight is light, which is beneficial to reducing the weight of the wearer. The adjusting component 10 is provided outside the airbag and is located directly above the overall pressure reducer. The wearer can see it by lowering his head, which is beneficial to checking the oxygen supply mode at this time and is easy to operate.

[0038] The manual supply valve 6 includes a valve body 61, which is a piston. The valve body 61 and the valve cavity are enclosed to form a medium-pressure chamber, and the medium-pressure chamber 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 the valve stem 64 is pushed to the left, the sealing body 63 is driven away from the valve body 2 61, so that oxygen can flow out as shown in FIG. Figure 1 The direction indicated by the thick solid arrow is that the oxygen supply path flows out of the pressure reducer through the channel opened in the center of the valve stem 64, realizing manual oxygen replenishment. In the process of pushing the valve stem 64 to the left, the medium pressure spring 62 is compressed and deformed. When the force on the push rod is removed, the medium pressure spring 62 returns to its initial state, the valve stem 64 returns to its initial position, and the valve stem 64 drives the sealing body 63 to reseal the valve body 2 61, preparing for the next manual oxygen replenishment action.

[0039] The automatic replenishment valve 9 adopts a pneumatic balance structure, including Figure 1 The valve cavity shown in the figure has a plunger 91, a quantitative diaphragm 92, and a second filter 93 that are fixedly connected from right to left in sequence. 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, and in this embodiment, it is made of an elastic rubber material. The plunger 91 and the valve core 2 are slidably matched and fix and press the quantitative diaphragm 92 and the second filter 93 in the initial state. The automatic replenishment valve 9 is based on the principle of pressure difference. The plunger 91 withstands the internal pressure of the pressure reducer and the air bag 14, and automatically adjusts the opening and closing of the valve according to the pressure difference formed between the two, thereby realizing automatic replenishment of oxygen. 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 circumferential direction. 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 circuit passes through the filter screen 93 and the through hole in the center of the quantitative diaphragm 92 in turn and acts on the end of the plunger 91 close to the quantitative diaphragm 92, and causes the plunger 91 to move rightward 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 replenishment valve 9 is installed and exposed to the internal environment of the airbag 14. At this time, oxygen flows into the airbag 14 from the oxygen supply circuit to achieve the effect of timely and automatic replenishment of oxygen 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 cavity is provided at one end of the valve sleeve 4 away from the valve body 1, i.e., a channel located inside the valve sleeve 4 (marked by the dotted arrow). The safety exhaust valve 8 includes an adjusting screw 81 threadedly connected to the valve sleeve 4 in the exhaust cavity, a gasket 82 fixedly connected to the end of the adjusting screw 81, and an exhaust spring 83 sleeved on the rod of the adjusting screw 81. The two ends of the exhaust spring 83 are respectively fixedly connected to the adjusting screw 81 and the gasket 82. A through hole is provided at the center of the adjusting screw 81. The working principle of the safety exhaust valve 8 is based on the action of pressure balance and spring force. Under normal working conditions, the tightened adjusting screw 81 ensures that the safety exhaust valve 8 is in a closed state. When the internal pressure of the pressure reducer exceeds the safety threshold, the gasket 82 will be pushed to move to the right, the exhaust spring 83 will be compressed, and the exhaust channel opening provided at the center of the adjusting screw will be connected to the exhaust channel inside the pressure reducer, so that part of the high-pressure gas inside the pressure reducer is released to reduce the internal pressure of the pressure reducer to restore to a normal level, and finally the exhaust channel opening is closed again under 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 comprises 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 comprises large-diameter ends 41 at both ends and a small-diameter end 42 in the middle, the paddle 101 is installed on the small-diameter end 42, and an oxygen supply vent hole 103 and an oxygen supply vent hole 2 104 with different apertures for connecting the oxygen supply circuit 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, and a safety valve vent hole 105 is also provided on the paddle 102, and 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 with 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 interval during the rotation process. No matter what oxygen supply mode it is in, that is, what position the paddle 102 is moved to, it can ensure that it is connected with the safety valve vent 105. A wedge-shaped steep slope 44 is set 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, thereby 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 provided along the circumferential direction of the outer wall of the valve sleeve 4, and a groove is provided 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 limit position of the strip hole 106, the oxygen supply vent hole 1 103 or the oxygen supply vent hole 2 104 connects the oxygen supply path. In this embodiment, the paddle 102 is moved to the left limit position, and the oxygen supply vent hole 1 103 is connected to the oxygen supply path in the motion state. According to practice, the oxygen supply flow rate is ≥2.1L / min. On the contrary, when the paddle 102 is moved to the right limit position, the oxygen supply vent hole 2 104 is connected to the oxygen supply path in the sitting state. According to practice, the oxygen supply flow rate is ≥0.5L / min.

[0042] A trapezoidal groove 43 is provided on the outer side of the valve sleeve 4. Figure 5 As shown, an annular clamp is provided at the opening of the airbag 14, and the annular clamp is clamped 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 10 mm, an outer diameter of 14 mm, and a depth of 1.25 mm is provided on the side of the valve body near the air inlet end, as shown in FIG. Figure 1 As shown, an O-type sealing ring 11 is embedded in the sealing groove 1. Several sealing grooves 2 are provided on the periphery of the valve core 2, and O-type sealing rings 12 are embedded in the sealing grooves 2.

[0043] The actual application process is as follows:

[0044] When used, oxygen flows as follows 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 from the automatic supply valve 9 to the air bag 14 first, that is, under normal circumstances, the automatic supply valve 9 can achieve the effect of timely and automatic replenishment of oxygen when there is no oxygen or insufficient oxygen in the air bag 14. When the automatic supply valve 9 fails or the user thinks that the oxygen outflow speed is too slow and needs to breathe 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 turn the paddle 102 to switch the oxygen supply mode at any time 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 is about 0.5L / min at this time. 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 turned 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 is about 2.1L / min at this time.

[0046] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope 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 required by 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 supply flow for a coal mine self-rescuer, characterized in that: It 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 oxygen flow direction. An oxygen supply path running through the high-pressure chamber to the medium-pressure chamber is provided at the same time. A high-pressure spring is provided in the high-pressure chamber. 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 outlet end. A filter screen 1 is fixedly provided in the air inlet end. A safety exhaust valve and an automatic replenishing valve are respectively fixedly provided in the 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, 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 the oxygen supply circuit are provided on the rotating shaft, and a safety valve vent hole is provided 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 oxygen supply vent hole 1 is ≥ 3 times the area of ​​the oxygen supply vent hole 2.

3. A pressure reducer with adjustable oxygen supply flow for a coal mine self-rescuer according to claim 2, characterized in that: The automatic replenishment 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. A pressure reducer with adjustable oxygen supply flow for a coal mine self-rescuer according to claim 3, characterized in that: The safety exhaust valve comprises an adjusting screw threadedly connected to the valve body, a gasket abutting against the end of the adjusting screw, and an exhaust spring sleeved on the end of the adjusting screw. A through hole is arranged at 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 arranged 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 supply flow 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 with 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.

Images