Multi-unit compressed gas source sequencing control and automatic switching pressure reducer

Abstract

The present application relates to the technical field of respiratory protection, in particular to a multi-unit compressed air source sequencing control and automatic switching pressure reducer. The present application provides a multi-unit compressed air source sequencing control and automatic switching pressure reducer, which only needs to open the connected compressed air source valve, without the need for operators to monitor and manually switch, each high-pressure unit module automatically switches the delivery of high-pressure gas according to the sequence, and the reduced pressure common module continuously reduces the pressure to supply air for respiratory protection, which not only improves the convenience and accuracy of operation, but also improves the utilization rate of compressed air source. The present application adopts a module design structure of axial series sequencing, radial parallel control and automatic switching delivery, and continuous pressure reduction for air supply of each high-pressure unit, which is composed of a plurality of high-pressure unit modules composed of a high-pressure unit cylinder + a unit control valve + a unit switch valve, and a high-pressure cylinder cover and a reduced pressure cylinder + a reduced pressure valve composed of a reduced pressure common module.

Description

Technical Field

[0001] This invention relates to the field of respiratory protection technology, specifically to a multi-unit compressed air supply source sequencing control and automatic switching pressure reducer. Background Technology

[0002] In the field of respiratory protection technology, there is a type of "on-demand long-tube respirator," which is personal respiratory protection equipment suitable for professionals to wear when working in toxic, harmful, and confined spaces for extended periods. To meet the needs of respiratory protection duration during operations, existing "on-demand long-tube respirators" are generally equipped with four high-pressure gas cylinders with a nominal working pressure of 30MPa and a nominal volume of 6.8L or 9L, forming a multi-unit compressed air supply structure. However, the pressure reducing device that comes with it is a unit pressure reducing design structure. It can only be ensured by the operator manually switching between the high-pressure gas cylinders by observing the high-pressure gauge reading and listening to the alarm. That is, first, the valve of the first high-pressure gas cylinder is opened to supply air. When the remaining pressure of the compressed gas in the first gas cylinder is observed to drop to about 5MPa, the valve of the second high-pressure gas cylinder needs to be opened manually to continue supplying air, and the valve of the first high-pressure gas cylinder needs to be closed, and so on. This not only makes the switching of the multi-unit compressed air supply source inconvenient and imprecise, but also reduces the utilization rate of the compressed air supply source to only 80%. Summary of the Invention

[0003] To overcome the shortcomings of existing pressure-reducing devices in "on-demand air-supply long-tube respirators", this invention provides a multi-unit compressed air supply source sorting and automatic switching pressure reducer. Simply open the valves of each compressed air supply source, and without operator supervision or manual switching, each high-pressure unit module automatically switches to deliver high-pressure gas according to the sorting, and continuously reduces and supplies gas for respiratory protection through a shared pressure-reducing module. This not only improves the convenience and accuracy of operation, but also increases the utilization rate of compressed air supply sources.

[0004] The technical solution for realizing the present invention is: a multi-unit compressed air supply source sorting and automatic switching pressure reducer, which adopts a modular design structure of axial series sorting, radial parallel control and automatic switching delivery of each high-pressure unit, and continuous pressure reduction air supply. It is composed of multiple high-pressure unit modules consisting of high-pressure unit cylinder + unit control valve + unit switch valve, and a pressure reduction shared module consisting of high-pressure cylinder cover and pressure reducing cylinder + pressure reducing valve.

[0005] The high-pressure unit cylinder is made of stainless steel and has a rectangular outer body with a circular inner axial air passage. The left axial port of the cylinder has a cylindrical serial input interface with external threads, and the interface has a constricted axial control valve port and a valve port control lock hole. The upper radial end of the left section of the cylinder has a high-pressure gauge interface, and the upper radial end of the right section of the cylinder has a switch port with internal threads. The switch end cover is used for threaded closure. The top of the cover is hexagonal, and the lower part of the top of the cover is a cylindrical connecting part with external threads. The lower end of the connecting part has a cylindrical switch control chamber. Perpendicular to the switch control chamber is a radial high-pressure input interface at the lower end of the cylinder. The interface has a tension spring lock. The right axial port of the cylinder air passage is a serial output interface with internal threads.

[0006] The unit control valve is made of metal and is axially inserted into the high-pressure unit cylinder's air passage. It is an axial unit air passage control mechanism with a barrier-type, reversible opening mechanism, consisting of a control valve body, control valve stem, control valve cap, control spring, control adjusting wheel, and control lever. The control valve body is a cylindrical chamber with a tapered port support at its left axial end, the same diameter as the axial control valve port. The port cross-section has a valve body control locking hole coaxial with the valve port's control locking hole. The right axial end port is open. The valve body features a lever support, a cylindrical drive rod with an internal threaded hole at the center of its left end, and external threads on the right side. The valve cap is a pneumatic valve piston with an external screw. The control spring is a helical compression spring. The control adjustment wheel has a spoked vent with an internal threaded hole at its center. The control lever is an L-shaped lever with a fulcrum hole, consisting of a long power arm and a short resistance arm. The control spring is sequentially inserted through the right end of the valve body's bore. Insert the sub-control valve stem with the internal threaded hole into the right port of the sub-control spring and protrude it from the left end of the sub-control valve body through the bore support. Connect the internal threaded hole of the sub-control adjustment wheel to the circumferential external thread of the right section of the sub-control valve stem. Press the wheel surface against the top of the sub-control spring. The outer diameter of the wheel and the inner circumferential surface of the sub-control valve body chamber should be in a sliding state. Rotate the sub-control adjustment wheel to set the compression tension of the sub-control spring. Connect the fulcrum hole of the sub-control lever to the lever bracket with a rivet. Then, place one end of the short rod resistance arm against the right end of the sub-control valve stem; insert the assembled unit sub-control valve axially from the right port of the high-pressure unit cylinder passage and abut it against the inner port of the axial sub-control valve port on the left end; lock it with screws inserted into the sub-control lock hole of the valve port and the sub-control lock hole of the valve body; then place the sub-control valve cap on the outer port of the axial sub-control valve port and lock it with the inner screw hole of the sub-control valve stem located in the axial sub-control valve port through the outer screw, so that the sub-control valve cap and the axial sub-control valve port form a reversible dynamic seal.

[0007] The unit switch valve is a bidirectional automatic switching mechanism made of metal, radially inserted into the high-pressure unit cylinder passage. It consists of a switch valve stem, a switch valve cap, a switch spring, a switch adjusting screw, and a switching adjusting screw. The switch valve stem has external threads circumferentially and an internal threaded hole at the center of one end. The switch valve cap has an external screw. The switch spring is a helical tension spring with connecting rings at both ends. The switch adjusting screw has a spring lock. Both the center of the switch adjusting screw and the center of the switching adjusting screw have internal threaded holes. The switch spring is radially inserted into the high-pressure unit cylinder passage from the switch port, and the connecting ring at the bottom of the spring locks against the spring lock at the lower end of the passage. Lock the switch valve cap to the inner threaded hole of the switch valve stem using the external screw and place it into the switch spring body. The switch valve cap should seal the inner opening of the radial high-pressure input interface. Then, rotate the switch adjusting screw disc to the external thread in the middle of the switch valve stem through the internal threaded hole. The disc surface presses against the top of the switch spring and is locked with the spring lock. Then, rotate the switching adjusting screw disc to the external thread on the upper part of the switch valve stem through the internal threaded hole and press down the sub-control lever power arm to cause the resistance arm to push the sub-control valve cap open in the opposite direction with horizontal thrust. Finally, put the switch gauge chamber of the switch end cover through the upper end of the switch valve stem. The valve stem forms a vertical sliding state in the chamber and is sealed and fixed by connecting the external thread of the switch end cover to the internal thread of the switch port.

[0008] The high-pressure unit module consists of a high-pressure unit cylinder, an axially inserted unit control valve, and a radially inserted unit switch valve. Its operating mechanism is as follows: When the high-pressure unit cylinder's air passage is static, the radial high-pressure input port is closed, and the axial control valve port is open. When the compressed air supply valve opens to deliver high-pressure gas, because the high-pressure gas input pressure > the high-pressure unit cylinder's air passage pressure + the switch spring tension, the pressure difference pushes open the switch valve cap, opening the radial high-pressure input port and inputting high-pressure gas into the high-pressure unit cylinder's air passage. This also pushes the switching adjustment screw connected to the switch valve rod thread to move vertically upward, releasing the pressure on the control lever's power arm and eliminating the horizontal thrust of the resistance arm, thus releasing the control spring. Horizontal tension synchronously pushes the sub-control valve cap connected to the sub-control valve stem to close the outer port of the axial sub-control valve and block the axial air passage; when the input pressure of the radial high-pressure input interface drops to < the pressure inside the high-pressure unit cylinder air passage + the tension of the switch spring, the switch spring vertically pulls the switch valve stem downward, causing the switch valve cap to close the radial high-pressure input interface. At the same time, the switch valve stem drives the switching adjustment screw to press the sub-control lever power arm vertically downward, causing the resistance arm to form an amplified horizontal thrust, pushing the sub-control valve cap connected to the sub-control valve stem to open the axial sub-control valve in the reverse direction, opening the axial air passage, forming a two-way automatic switching mechanism of "radial high-pressure input interface open / closed ⇋ axial sub-control valve closed / open".

[0009] The high-pressure cylinder cover is a concave inner circle and outer square made of stainless steel. The cover has internal threads along its inner circumference and is used as a sealing component after multiple high-pressure unit cylinders are assembled in series.

[0010] The pressure-reducing cylinder is made of stainless steel and has a medium-pressure cylinder body with a square outer shell and a cylindrical inner chamber. The cylinder has a cylindrical axial high-pressure input interface with external threads on the left axial port, a pressure-reducing valve port on the left axial port, a medium-pressure gauge interface on the upper radial end, a safety valve interface on the lower radial end, and an internal thread on the inner circumference of the right axial port. Connected to the cylinder is a pressure-reducing output end cover. The left end cover has a cylindrical circumferentially threaded connection part, the right end cover has a square top cover, and the center of the end cover has a medium-pressure output interface.

[0011] The pressure reducing valve is a pressure reducing mechanism made of metal and axially inserted into the chamber of a pressure reducing cylinder. It consists of a pressure reducing rod, a pressure reducing valve cap, a pressure reducing gauge wheel, a pressure reducing adjusting screw, and a pressure reducing spring. The left end of the pressure reducing rod has an internal threaded hole, and the left section of the rod has external threads. The pressure reducing valve cap has an external screw. The pressure reducing gauge wheel has spoke-type vents and an internal threaded hole at its center. The pressure reducing adjusting screw has external threads on its outer diameter, a rod gauge bore at its center, and spoke-type vents on its surface. The pressure reducing spring is a helical compression spring. The external screw of the pressure reducing valve cap is sequentially connected to the internal threaded hole of the pressure reducing rod, and the internal threaded hole of the pressure reducing gauge wheel is connected to... Lock the external thread at the left end of the pressure reducing lever. Slide the pressure reducing spring through the right end of the pressure reducing lever and abut it against the surface of the pressure reducing gauge wheel. Insert the above components axially into the right end of the pressure reducing cylinder bore, and seal the pressure reducing valve cap against the pressure reducing valve bore. The outer diameter of the pressure reducing gauge wheel is circumferentially slidable with the circumferential surface of the cylinder bore. Slide the pressure reducing adjusting screw through the gauge bore of the lever at the right end of the pressure reducing lever to form a slidable state. Press the top of the pressure reducing spring against the screw surface. Connect the external thread of the screw to the internal thread at the right end of the pressure reducing cylinder bore. Rotate the pressure reducing adjusting screw to set the compression tension of the pressure reducing spring and lock it. Then, connect the external thread of the pressure reducing output end cap to the internal thread at the right end of the pressure reducing cylinder bore and rotate to lock it securely.

[0012] A pressure-reducing shared module consists of a pressure-reducing cylinder and an axially inserted pressure-reducing valve.

[0013] Connect the series input and output interfaces of each high-pressure unit cylinder to each other with screw threads, and lock them in axial series order. Seal the high-pressure cylinder cover with the series input interface of the leftmost high-pressure unit cylinder with screw threads. Fix the axial high-pressure input interface of the pressure reducing cylinder with the series output interface of the rightmost high-pressure unit cylinder with screw threads. Add sealing rings to each connection part to ensure that the connection is firm and airtight. This completes the multi-unit compressed air supply source sorting control and automatic switching pressure reducing device.

[0014] Next, install the instrumentation of this invention and connect it to the relevant components of the "on-demand air supply long tube respirator" main unit. Specifically, install a high-pressure gauge at the high-pressure gauge interface, a medium-pressure gauge at the medium-pressure gauge interface, a safety valve at the safety valve interface, connect the radial high-pressure input interface to the compressed air supply source delivery pipe connector, and connect the medium-pressure output interface to the medium-pressure air delivery pipe connector. After powering on, each high-pressure unit module can automatically switch the compressed air supply source to deliver high-pressure gas according to the sequence, and continuously reduce the pressure through the depressurization shared module to supply gas to the respiratory protection system. Attached Figure Description

[0015] Figure 1 This is a front-view sectional view of a multi-unit compressed air supply source sequencing control and automatic switching pressure reducer.

[0016] Figure 2 This is a schematic diagram of a multi-unit compressed air supply source sequencing control and automatic switching pressure reducer, configured with four high-pressure unit modules.

[0017] In the diagram: 1. High-pressure unit cylinder; 2. Unit sub-control valve; 3. Unit switch switching valve; 4. High-pressure cylinder cover; 5. Pressure reducing cylinder; 6. Pressure reducing valve; 7. Series input interface; 8. Axial sub-control valve port; 9. Valve port sub-control lock hole; 10. High-pressure gauge interface; 11. Switch port; 12. Switch end cover; 13. Switch gauge chamber; 14. Radial high-pressure input interface; 15. Series output interface; 16. Sub-control valve body; 17. Sub-control valve stem; 18. Sub-control valve cap; 19. Sub-control spring; 20. Sub-control adjusting wheel; 21. Sub-control lever; 22. Valve body sub-control lock hole; 23. Lever bracket; 24. Spoke-type vent. 25. Switch valve stem, 26. Switch valve cap, 27. Switch tension spring, 28. Switch adjusting screw, 29. Switch adjusting screw, 30. Axial high pressure input interface, 31. Pressure reducing valve port, 32. Medium pressure gauge interface, 33. Safety valve interface, 34. Pressure reducing output end cap, 35. Medium pressure output interface, 36. Pressure reducing piston rod, 37. Pressure reducing valve cap, 38. Pressure reducing gauge wheel, 39. Pressure reducing adjusting screw, 40. Pressure reducing spring, 41. Piston rod gauge bore, 42. Sealing ring, 43. High pressure gauge, 44. Medium pressure gauge, 45. Safety valve, 46. Compressed air supply source delivery pipe connector, 47. Medium pressure air guide pipe connector. Detailed Implementation

[0018] The present invention will now be further described with reference to the accompanying drawings.

[0019] like Figure 1 and Figure 2As shown, a multi-unit compressed air supply source sequencing control and automatic switching pressure reducer adopts a modular design structure in which each high-pressure unit is axially connected in series, radially connected in parallel for separate control and automatic switching, and continuously pressure-reducing air supply. In order to match the existing "on-demand air supply long tube respirator" which is generally equipped with four high-pressure gas cylinders for compressed air supply, in specific implementation, it is composed of four high-pressure unit modules consisting of high-pressure unit cylinder 1 + unit control valve 2 + unit switch valve 3, and a pressure reduction shared module consisting of high-pressure cylinder cover 4 and pressure-reducing cylinder 5 + pressure-reducing valve 6.

[0020] For ease of description, Figure 2 The four high-pressure unit cylinders 1 connected in series axially are arranged from right to left as A, B, C, and D.

[0021] The high-pressure unit cylinder 1 is made of stainless steel and has a rectangular outer shape with a circular inner axial air passage. The left axial port of the cylinder is provided with a cylindrical serial input interface 7 with external threads. The interface is provided with a constricted axial control valve port 8 and a valve port control lock hole 9. The upper radial end of the left section of the cylinder is provided with a high-pressure gauge interface 10. The upper radial end of the right section of the cylinder is provided with a switch port 11 with internal threads. The switch end cover 12 is provided for threaded sealing. The top of the cover is hexagonal. The lower part of the top of the cover is a cylindrical connecting part with external threads. The lower end of the connecting part is provided with a cylindrical switch control chamber 13. The radial high-pressure input interface 14 is provided at the lower end of the cylinder, which is perpendicular to the switch control chamber 13. The interface is provided with a tension spring lock. The right axial port of the cylinder air passage is a serial output interface 15 with internal threads.

[0022] The unit control valve 2 is made of metal and is axially inserted into the air passage of the high-pressure unit cylinder 1. It is an axial unit air passage control mechanism with a barrier-type reversible opening mechanism, consisting of a control valve body 16, a control valve stem 17, a control valve cap 18, a control spring 19, a control adjusting wheel 20, and a control lever 21. The control valve body 16 is a cylindrical chamber with a constricted bore support at its left axial end that has the same diameter as the axial control valve port 8. The bore cross-section has a valve body control locking hole 22 that is coaxial and has the same hole as the valve port control locking hole 9. The right end of the bore is... The open-type valve body 16 is equipped with a lever support 23. The sub-control valve stem 17 is a cylindrical drive rod with an internal threaded hole at the center of its left end face and an external thread on the right side. The sub-control valve cap 18 is a pneumatic switch piston with an external screw. The sub-control spring 19 is a helical compression spring. The sub-control adjusting wheel 20 has a spoke-type vent 24 with an internal threaded hole at its center. The sub-control lever 21 is an L-shaped force-applying lever with a fulcrum hole, consisting of a long lever power arm and a short lever resistance arm. The sub-control spring 19 is sequentially inserted through the right end of the sub-control valve body 16. Insert the sub-control valve stem 17, with its internal threaded hole, into the right port of the sub-control spring 19 and protrude it from the left end of the sub-control valve body 16. Connect the internal threaded hole of the sub-control adjusting wheel 20 to the circumferential external thread of the right section of the sub-control valve stem 17. Press the wheel surface against the top of the sub-control spring 19. The outer diameter of the wheel and the inner circumferential surface of the sub-control valve body 16 are in a sliding state. Rotate the sub-control adjusting wheel 20 to set the compression tension of the sub-control spring 19. Connect the fulcrum hole of the sub-control lever 21 to the lever bracket 23 with a rivet. Connect and place one end of the short rod resistance arm against the right end of the sub-control valve rod 17; insert the assembled unit sub-control valve 2 axially from the right port of the high-pressure unit cylinder 1 air passage and abut it against the inner port of the axial sub-control valve port 8 at the left end; lock it with screws inserted into the valve port sub-control lock hole 9 and the valve body sub-control lock hole 22; then place the sub-control valve cap 18 on the outer port of the axial sub-control valve port 8 and lock it with the inner screw hole of the sub-control valve rod 17 located in the axial sub-control valve port 8 through the outer screw, so that the sub-control valve cap 18 and the axial sub-control valve port 8 form a reversible dynamic seal state.

[0023] The unit switch switching valve 3 is a bidirectional automatic switching mechanism made of metal, radially inserted into the air passage of the high-pressure unit cylinder 1. It consists of a switch valve rod 25, a switch valve cap 26, a switch tension spring 27, a switch adjusting screw 28, and a switching adjusting screw 29. The switch valve rod 25 has external threads circumferentially and an internal threaded hole at the center of one end. The switch valve cap 26 has an external screw. The switch tension spring 27 is a helical tension spring with connecting rings at both ends. The switch adjusting screw 28 has a tension spring lock. Both the center of the switch adjusting screw 28 and the center of the switching adjusting screw 29 have internal threaded holes. The switch tension spring 27 is radially inserted into the air passage of the high-pressure unit cylinder 1 from the switch port 11, and the connecting ring at the bottom of the tension spring is locked to the tension spring lock at the lower end of the air passage. The switch valve cap 26 is locked to the inner threaded hole of the switch valve stem 25 by an external screw and placed into the switch spring 27. The switch valve cap 26 should seal the inner opening of the radial high pressure input interface 14. Then, the switch adjusting screw 28 is rotated and threaded to the middle external thread of the switch valve stem 25 through the internal threaded hole. The screw 28 presses against the top of the switch spring 27 and is locked with the spring lock. Then, the switching adjusting screw 29 is rotated and threaded to the upper external thread of the switch valve stem 25 through the internal threaded hole, and the power arm of the sub-control lever 21 is pressed down to cause the horizontal thrust of the resistance arm to push the sub-control valve cap 18 open in the opposite direction. Finally, the switch regulating chamber 13 of the switch end cover 12 is fitted through the upper end of the switch valve stem 25. The valve stem forms a vertically sliding state in the chamber. The switch end cover 12 is closed and fixed by the external thread of the switch end cover 12 and the internal thread of the switch port 11.

[0024] The high-pressure unit module consists of a high-pressure unit cylinder 1, an axially inserted unit control valve 2, and a radially inserted unit switch valve 3. Its operating mechanism is as follows: When the high-pressure unit cylinder 1's air passage is static, the radial high-pressure input port 14 is closed, and the axial control valve port 8 is open. When the compressed air supply valve opens to deliver high-pressure gas, because the high-pressure gas input pressure > the pressure in the high-pressure unit cylinder 1's air passage + the tension of the switch spring 27, the pressure difference pushes open the switch valve cap 26, opening the radial high-pressure input port 14, inputting high-pressure gas into the high-pressure unit cylinder 1's air passage, and pushing the switch valve rod 25, connected to the switching adjustment screw 29, vertically upwards, releasing the pressure on the control lever 21's power arm and causing the horizontal thrust of the resistance arm to disappear. The control spring 19 then releases its horizontal tension. The control valve cap 18 connected to the control valve stem 17 is pushed to close the outer port of the axial control valve port 8, blocking the axial air passage. When the input pressure of the radial high pressure input interface 14 drops to < the pressure inside the air passage of the high pressure unit cylinder 1 + the tension of the switch spring 27, the switch spring 27 vertically pulls the switch valve stem 25 downward, causing the switch valve cap 26 to close the radial high pressure input interface 14. At the same time, the switch valve stem 25 drives the switching adjustment screw 29 to press the power arm of the control lever 21 downward vertically, so that the resistance arm forms an amplified horizontal thrust, pushing the control valve cap 18 connected to the control valve stem 17 to open the axial control valve port 8 in the opposite direction, opening the axial air passage, forming a axial diameter bidirectional switch automatic switching mechanism of "radial high pressure input interface 14 open / close ⇋ axial control valve port 8 closed / open".

[0025] The high-pressure cylinder cover 4 is made of stainless steel, with a concave inner circle and an outer square body. The cover has internal threads along its inner circumference and is used as a sealing component after multiple high-pressure unit cylinders 1 are assembled in series.

[0026] The pressure-reducing cylinder 5 is made of stainless steel and has a medium-pressure cylinder body with a square outer shell and a cylindrical inner chamber. The cylinder has a cylindrical axial high-pressure input interface 30 with external threads on the left axial port, a pressure-reducing valve port 31 with a constricted opening on the left axial port, a medium-pressure gauge interface 32 at the upper radial end, a safety valve interface 33 at the lower radial end, and an internal thread on the inner circumference of the right axial port. Connected to the right port is a pressure-reducing output end cover 34. The left end cover has a cylindrical circumferentially threaded connection part, the right end cover has a square top cover, and the center of the end cover has a medium-pressure output interface 35.

[0027] The pressure reducing valve 6 is a pressure reducing mechanism made of metal and axially inserted into the air chamber of the pressure reducing cylinder 5. It consists of a pressure reducing rod 36, a pressure reducing valve cap 37, a pressure reducing regulating wheel 38, a pressure reducing adjusting screw 39, and a pressure reducing spring 40. The pressure reducing rod 36 has an internal threaded hole on its left end and external threads on its left circumferential section. The pressure reducing valve cap 37 has an external screw. The pressure reducing regulating wheel 38 has a spoke-type vent 24 on its surface and an internal threaded hole at its center. The pressure reducing adjusting screw 39 has external threads on its outer diameter, a rod regulating bore 41 at its center, and spoke-type vents 24 on its surface. The pressure reducing spring 40 is a helical compression spring. The external screw of the pressure reducing valve cap 37 is sequentially connected to the internal threaded hole of the pressure reducing rod 36, and the internal thread of the pressure reducing regulating wheel 38 is connected to the internal threaded hole of the pressure reducing rod 36. Lock the hole to the external thread of the left end of the pressure reducing rod 36. Slide the pressure reducing spring 40 through the right end of the pressure reducing rod 36 and abut it against the surface of the pressure reducing gauge wheel 38. Insert the above components axially into the right end of the pressure reducing cylinder 5 and make the pressure reducing valve cap 37 abut against the pressure reducing valve port 31. The outer diameter of the pressure reducing gauge wheel 38 is circumferentially slidable with the cylinder bore. Slide the rod gauge bore 41 of the pressure reducing adjusting screw 39 through the right end of the pressure reducing rod 36 to form a slidable state. The surface of the screw 39 presses against the top of the pressure reducing spring 40. The external thread of the screw 39 is threaded with the internal thread of the right end of the pressure reducing cylinder 5. Rotate the pressure reducing adjusting screw 39 to set the compression tension of the pressure reducing spring 40 and lock it. Then, thread the external thread of the pressure reducing output end cap 34 firmly with the internal thread of the right end of the pressure reducing cylinder 5.

[0028] A pressure-reducing shared module is formed by a pressure-reducing cylinder 5 and an axially inserted pressure-reducing valve 6.

[0029] Connect the series input interfaces 7 and series output interfaces 15 of the four high-pressure unit cylinders 1 (A, B, C, and D) to each other with screw threads and lock them in axial series order. Seal the high-pressure cylinder cover 4 with the series input interface 7 of the high-pressure unit cylinder 1 (D) with screw threads. Fix the axial high-pressure input interface 30 of the pressure reducing cylinder 5 with the series output interface 15 of the high-pressure unit cylinder 1 (A) with screw threads. Add sealing rings 42 to each connection part to ensure a firm and airtight connection. This completes the multi-unit compressed air supply source sorting control and automatic switching pressure reducing device.

[0030] Next, the invention is installed on instruments and connected to the relevant components of the "on-demand air supply long tube respirator" main unit. Specifically, the high-pressure gauge 43 is installed on the high-pressure gauge interface 10, the medium-pressure gauge 44 is installed on the medium-pressure gauge interface 32, the safety valve 45 is installed on the safety valve interface 33, the radial high-pressure input interface 14 is connected to the compressed air supply source delivery pipe connector 46, and the medium-pressure output interface 35 is connected to the medium-pressure air delivery pipe connector 47. After power-on, each high-pressure unit module can automatically switch the compressed air supply source to deliver high-pressure gas according to the sequence, and continuously reduce the pressure through the depressurization shared module to supply gas to the respiratory protection system.

[0031] The operating mechanism of this invention is as follows: All four high-pressure gas cylinders filled with compressed gas are opened, ensuring that the cylinders 1 of the four high-pressure units (A, B, C, and D) are in a state of high-pressure gas delivery. The high-pressure gas pushes the switch valve caps 26 of each unit upwards, causing the switching adjustment screw 29 connected to the switch valve rod 25 to move vertically upwards. This releases the pressure on the power arm of the sub-control lever 21 and eliminates the horizontal thrust of the resistance arm. Simultaneously, the sub-control spring 19 releases horizontal tension, pulling the sub-control valve cap 18 connected to the sub-control valve rod 17 to close the axial direction. The control valve port 8 blocks the axial airway, causing the high-pressure gas to be tightly sealed within each high-pressure unit cylinder 1 and the connected high-pressure gas cylinders, preventing its flow. Only the high-pressure gas in high-pressure unit cylinder 1 (connected to pressure reducing cylinder 5) can be output through the series output interface 15 at the right port of the airway, and after being depressurized by the pressure reducing valve port 31 of pressure reducing cylinder 5, it enters the respiratory protection system. When the pressure value of the compressed gas connected to high-pressure unit cylinder 1 (A) drops to < the tension of switch spring 27 + the airway pressure of high-pressure unit cylinder 1, switch spring 27 is activated. The switch valve stem 25 moves vertically downward, causing the switch valve cap 26 to close the radial high-pressure input interface 14. Simultaneously, it causes the switching adjusting screw 29 to press the power arm of the sub-control lever 21 vertically downward, causing the resistance arm to switch and amplify the horizontal thrust. Because the amplified horizontal thrust of the resistance arm > the tension of the sub-control spring 19 + the air pressure of cylinder 1 in high-pressure unit B, the resistance arm pushes the sub-control valve cap 18 connected to the sub-control valve stem 17 to open the axial sub-control valve port 8 in the reverse direction, opening the axial air passage. This allows the high-pressure gas in cylinder 1 of high-pressure unit B to pass through the axial air passage. The gas enters the air passage of cylinder 1 in high-pressure unit A through the control valve port 8. Because the radial high-pressure input port 14 in the air passage of cylinder 1 in high-pressure unit A has been closed by the switch valve cap 26, the high-pressure gas cannot flow out radially. It can only pass through the axial air passage and be depressurized through the depressurization valve port 31 of the depressurization cylinder 5 before being delivered to the respiratory protection system for continuous inhalation by the user. This process continues until the compressed air supply sources connected to the four high-pressure unit cylinders 1 (A, B, C, and D) are automatically switched and continuously depressurized and the air supply is exhausted. Only then is it necessary to manually shut down the system.

[0032] The beneficial effects of this invention are as follows: A multi-unit compressed air supply source sequencing control and automatic switching pressure reducer, which is installed in the main unit of an "on-demand air supply long tube respirator", can make up for the shortcomings of the existing pressure reducing device of the "on-demand air supply long tube respirator". Only by opening the valves of each compressed air supply source, without the need for operator supervision or manual switching, each high-pressure unit module automatically switches to deliver high-pressure gas according to the sequence, and the gas is continuously reduced and supplied for respiratory protection through the pressure reducing common module. This not only improves the convenience and accuracy of operation, but also increases the utilization rate of the compressed air supply source to more than 90%.

Claims

1. A multi-unit compressed air supply source sequencing control and automatic switching pressure reducer, characterized in that: it adopts... The modular design structure of each high-pressure unit is arranged in axial series, radially parallel, and automatically switched for delivery and continuous pressure reduction. It consists of multiple high-pressure unit modules composed of a high-pressure unit cylinder (1), a unit control valve (2), and a unit switch valve (3), as well as a pressure reduction shared module composed of a high-pressure cylinder cover (4) and a pressure reducing cylinder (5) and a pressure reducing valve (6). The high-pressure unit cylinder (1) is a high-pressure cylinder body with a rectangular outer shape and a circular inner axial air passage. The left axial port is provided with a cylindrical series input interface (7), and the interface is provided with an axial control valve port (8) and a valve port control lock hole (9). The upper radial end of the left section of the cylinder is provided with a high-pressure gauge interface (10), and the upper radial end of the right section of the cylinder is provided with a high-pressure gauge interface (10). It has a switch port (11) and a switch end cover (12). The lower end of the end cover top connection part is provided with a cylindrical switch control chamber (13). The lower end of the vertically corresponding cylinder is provided with a radial high pressure input interface (14). The right port of the cylinder air passage is a series output interface (15). The unit control valve (2) is an axial unit air passage control mechanism that is axially inserted into the air passage of the high pressure unit cylinder (1) and can be opened in reverse. It consists of a control valve body (16), a control valve rod (17), a control valve cap (18), a control spring (19), a control adjustment wheel (20), and a control lever (21). The left end of the control valve body (16) has a valve body control lock hole (22). A lever support (23) is provided at the right end of the axial end of the bore, and a spoke-type air inlet (24) is provided on the sub-control adjustment wheel (20); the unit switch switching valve (3) is an automatic switching mechanism for the axial diameter bidirectional switch that is radially inserted into the air passage of the high-pressure unit cylinder (1), and is composed of a switch valve rod (25), a switch valve cap (26), a switch tension spring (27), a switch adjustment screw (28), and a switching adjustment screw (29); the high-pressure cylinder cover (4) is a U-shaped inner circle outer cube, used as a sealing component after multiple sets of high-pressure unit cylinders (1) are connected in series; the pressure reducing cylinder (5) is a medium-pressure cylinder body with an outer cube and an inner cylindrical air chamber, and an axial high-pressure input interface (30) is provided at the left axial end, and an axial left The bore is provided with a pressure reducing valve port (31), a medium pressure gauge interface (32) is provided at the upper radial end, a safety valve interface (33) is provided at the lower radial end, a pressure reducing output end cap (34) is provided at the right axial port, and a medium pressure output interface (35) is provided at the center of the end cap; the pressure reducing valve (6) is a pressure reducing mechanism that is axially inserted into the chamber of the pressure reducing cylinder (5), and is composed of a pressure reducing rod (36), a pressure reducing valve cap (37), a pressure reducing gauge wheel (38), a pressure reducing adjusting screw (39), and a pressure reducing spring (40). The pressure reducing adjusting screw (39) is provided with a rod gauge bore (41) at the center, and the pressure reducing gauge wheel (38) and the pressure reducing adjusting screw (39) are all provided with spoke-type air vents (24);The unit control valve (2) is axially inserted into the air passage of the high-pressure unit cylinder (1), and the unit switch valve (3) is radially inserted into the air passage of the high-pressure unit cylinder (1), forming a high-pressure unit module with an automatic switching mechanism of "radial high-pressure input interface (14) open / close ⇋ axial control valve port (8) closed / open". The pressure reducing valve (6) is axially inserted into the air chamber of the pressure reducing cylinder (5), forming a pressure reducing shared module. The series input interfaces (7) of each high-pressure unit cylinder (1) are connected to the air passage of the high-pressure unit cylinder (1). The series output interfaces (15) are connected to each other by screw threads and locked in an axial series sequence. The high-pressure cylinder cover (4) is screwed closed to the series input interface (7) of the leftmost high-pressure unit cylinder (1). The axial high-pressure input interface (30) of the pressure reducing cylinder (5) is screwed and fixed to the series output interface (15) of the rightmost high-pressure unit cylinder (1). Each connection part is padded with a sealing ring (42) to ensure a firm and airtight connection. Thus, a multi-unit compressed air supply source sequencing control and automatic switching pressure reducer is formed.

2. The multi-unit compressed air supply source sequencing control and automatic switching pressure reducer according to claim 1, characterized in that: The high-pressure unit cylinder (1) is a high-pressure cylinder body made of stainless steel with a rectangular outer shape and a circular inner axial air passage. The cylinder's axial left port is provided with a cylindrical serial input interface (7) with external threads. The interface is provided with a constricted axial sub-control valve port (8) and a valve port sub-control lock hole (9). The cylinder's left section is provided with a high-pressure gauge interface (10) at the radial upper end. The cylinder's right section is provided with a switch port (11) with internal threads at the radial upper end. The switch end cover (12) is provided for threaded sealing. The top of the cover is hexagonal. The bottom of the top of the cover is a cylindrical connecting part with external threads in the circumferential direction. The lower end of the connecting part is provided with a cylindrical switch control chamber (13). The radial high-pressure input interface (14) is provided at the lower end of the cylinder, which is perpendicular to the switch control chamber (13). The interface is provided with a tension spring lock. The cylinder's air passage's axial right port is a serial output interface (15) with internal threads in the inner circumferential direction.

3. The multi-unit compressed air supply source sequencing control and automatic switching pressure reducer according to claim 1, characterized in that: The unit control valve (2) is an axial unit air passage control mechanism made of metal material, which is placed in the air passage of the high-pressure unit cylinder (1) and is reversibly openable. It consists of a control valve body (16), a control valve stem (17), a control valve cap (18), a control spring (19), a control adjustment wheel (20), and a control lever (21). The control valve body (16) is a cylindrical chamber with a constricted port support of the same diameter as the control valve port (8) on its left axial end. The port section is provided with a valve body control lock hole (22) that is coaxial and has the same hole as the control lock hole (9) of the valve port. The port on the right axial end is open. The valve body (16) is equipped with a lever support (23). The valve stem (17) is a cylindrical drive rod with an internal threaded hole at the center of the left end face and an external thread on the right side of the valve stem. The valve cap (18) is a gas port switch piston with an external screw. The valve spring (19) is a spiral compression spring. The valve adjustment wheel (20) is equipped with a spoke-type air port (24) with an internal threaded hole at the center of the wheel. The valve lever (21) is an L-shaped force lever with a fulcrum hole, consisting of a long rod power arm and a short rod resistance arm. The valve spring (19) is inserted axially into the right end of the valve body (16). And press against the left end of the bore support, insert the sub-control valve rod (17) with the end with the internal thread hole into the right end of the sub-control spring (19) and protrude from the left end of the bore support of the sub-control valve body (16), connect the internal thread hole of the sub-control adjustment wheel (20) with the circumferential external thread of the right section of the sub-control valve rod (17), press the wheel surface against the top of the sub-control spring (19), and form a sliding state between the outer diameter of the wheel and the inner circumferential surface of the sub-control valve body (16) chamber, rotate the sub-control adjustment wheel (20) to set the compression tension of the sub-control spring (19), and connect the fulcrum hole of the sub-control lever (21) to the lever bracket (23) with a rivet. And touch one end of the short rod resistance arm to the right end of the sub-control valve rod (17); insert the assembled unit sub-control valve (2) axially from the right port of the high pressure unit cylinder (1) air passage and abut it to the inner port of the left axial sub-control valve port (8), and lock it with screws inserted into the valve port sub-control lock hole (9) and the valve body sub-control lock hole (22), and then place the sub-control valve cap (18) on the outer port of the axial sub-control valve port (8) and lock it with the inner screw hole of the sub-control valve rod (17) located in the axial sub-control valve port (8) through the outer screw, so that the sub-control valve cap (18) and the axial sub-control valve port (8) form a reversible dynamic seal state.

4. The multi-unit compressed air supply source sequencing control and automatic switching pressure reducer according to claim 1, characterized in that: The unit switch switching valve (3) is a axial bidirectional automatic switching mechanism made of metal material and placed radially inside the air passage of the high-pressure unit cylinder (1). It consists of a switch valve rod (25), a switch valve cap (26), a switch spring (27), a switch adjusting screw (28), and a switching adjusting screw (29). The switch valve rod (25) has external threads around its circumference and an internal thread hole at the center of one end of its cross section. The switch valve cap (26) has an external screw. The switch spring (27) is a spiral tension spring with connecting rings at both ends. The switch adjusting screw (28) has a tension spring lock. Both the center of the switch adjusting screw (28) and the center of the switching adjusting screw (29) have internal thread holes. The switch spring (27) is inserted radially into the air passage of the high-pressure unit cylinder (1) from the switch port (11). The connecting ring at the bottom of the spring is locked to the tension spring lock at the bottom of the air passage. The switch valve cap is then locked. (26) Lock the switch valve stem (25) with the external screw and insert it into the switch spring (27). The switch valve cap (26) should seal the inner opening of the radial high pressure input interface (14). Then, rotate the switch adjustment screw (28) through the internal screw hole to the external thread in the middle of the switch valve stem (25). Press the screw surface against the top of the switch spring (27) and lock it with the spring lock. Then rotate the switching adjustment screw (29) through the internal screw hole to the external thread on the upper part of the switch valve stem (25) and press down the sub-control lever (21) power arm to cause the horizontal thrust amplified by the resistance arm to push open the sub-control valve cap (18) in the opposite direction. Finally, put the switch control chamber (13) of the switch end cover (12) through the upper end of the switch valve stem (25). The valve stem forms a vertical sliding state in the chamber. It is sealed and fixed by connecting the external thread of the switch end cover (12) with the internal thread of the switch port (11).

5. A multi-unit compressed air supply source sequencing control and automatic switching pressure reducer according to claim 1, characterized in that: The pressure reducing cylinder (5) is a medium-pressure cylinder body made of stainless steel with a square outer shell and a cylindrical inner chamber. The cylinder has a cylindrical axial high-pressure input interface (30) with external threads on the left axial port. The cylinder has a closed-type pressure reducing valve port (31) on the left axial port, a medium-pressure gauge interface (32) on the upper radial end, a safety valve interface (33) on the lower radial end, and an internal thread on the inner circumference of the right axial port. Connected to the right port is a pressure reducing output end cover (34). The left end cover is a cylindrical circumferentially threaded connection part, the right end cover is a square top cover, and the center of the end cover has a medium-pressure output interface (35).

6. The multi-unit compressed air supply source sequencing control and automatic switching pressure reducer according to claim 1, characterized in that: The pressure reducing valve (6) is a pressure reducing mechanism made of metal material and placed axially in the air chamber of the pressure reducing cylinder (5). It consists of a pressure reducing rod (36), a pressure reducing valve cap (37), a pressure reducing regulating wheel (38), a pressure reducing adjusting screw (39), and a pressure reducing spring (40). The left end of the pressure reducing rod (36) has an internal threaded hole, and the left section of the rod body has an external thread. The pressure reducing valve cap (37) has an external screw. The pressure reducing regulating wheel (38) has a spoke-type vent (24) on its surface and an internal threaded hole at its center. The pressure reducing adjusting screw (39) has an external thread on its outer diameter, a rod regulating bore (41) at its center, and a spoke-type vent (24) on its surface. The pressure reducing spring (40) is a spiral compression spring. The external screw of the pressure reducing valve cap (37) is connected to the internal threaded hole of the pressure reducing rod (36) in sequence, and the internal threaded hole of the pressure reducing regulating wheel (38) is connected to the internal threaded hole of the pressure reducing rod (36). Lock the external thread at the left end of the pressure reducing lever (36), and pass the pressure reducing spring (40) through the right end of the pressure reducing lever (36) and abut against the surface of the pressure reducing gauge wheel (38); insert the above components axially into the right end of the pressure reducing cylinder (5) and make the pressure reducing valve cap (37) abut against the pressure reducing valve port (31), and make the outer diameter of the pressure reducing gauge wheel (38) slide with the cylinder bore circumferential surface; pass the lever gauge bore (41) of the pressure reducing adjusting screw (39) through the right end of the pressure reducing lever (36) to make it slide, press the top of the pressure reducing spring (40) on the screw surface, and connect the external thread of the screw outer diameter with the internal thread at the right end of the pressure reducing cylinder (5) bore; rotate the pressure reducing adjusting screw (39) to set the compression tension of the pressure reducing spring (40) and lock it; then connect the external thread of the pressure reducing output end cap (34) with the internal thread at the right end of the pressure reducing cylinder (5) bore and rotate to lock it.

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