A long tube respirator pressure difference driving type emergency gas supply automatic switching device

Abstract

The present application relates to the technical field of respiratory protection, in particular to a long tube respirator pressure difference driving type emergency gas supply automatic switching device. In order to overcome the deficiency of the existing long tube respirator emergency gas supply, the present application provides a long tube respirator pressure difference driving type emergency gas supply automatic switching device, which does not need manual operation when the main gas source pressure is insufficient or interrupted, and the pressure difference driving mechanism automatically switches on the portable emergency gas source, implements non-delay and non-interrupted emergency gas supply, and provides safe and effective respiratory protection guarantee for the evacuation of workers from toxic, harmful and narrow working places within the rated emergency respiratory protection time. The present application adopts a pressure difference driving automatic switching mechanism and a "two-in-one-out" three-way airway orthogonal design structure, which is composed of a three-way switching cylinder, a pressure difference driving valve, a control spring and a quick connection type socket.

Description

Technical Field

[0001] This invention relates to the field of respiratory protection technology, specifically to a pressure differential driven emergency air supply automatic switching device for long-tube respirators. Background Technology

[0002] A long-tube respirator is a personal respiratory protective equipment that uses compressed air as its air source and delivers clean air through a long tube. It is worn by professionals when entering toxic, hazardous, or confined spaces. According to national and fire and rescue industry standards, the main air supply tube of a long-tube respirator is typically 30–60 meters long. In actual applications, the longest straight-line distance between the wearer and the main air supply source can reach 70 meters. If the main air supply source or the main air supply tube malfunctions, resulting in insufficient or interrupted air supply, it will directly endanger the health and even the lives of the workers. To ensure the respiratory safety of workers, an emergency escape device is required. However, because existing long-tube respirator main air supply systems lack an automatic emergency air supply switching mechanism, it is difficult to guarantee uninterrupted emergency air supply to the wearer when the main air supply system malfunctions. Summary of the Invention

[0003] To overcome the shortcomings of existing long-tube respirators in emergency air supply, this invention provides a pressure differential driven automatic emergency air supply switching device for long-tube respirators. When the main air supply pressure is insufficient or interrupted, the pressure differential driving mechanism automatically switches to the portable emergency air supply source without manual operation, providing a delay-free and uninterrupted emergency air supply. Within the rated emergency respiratory protection time, it provides safe and effective respiratory protection for workers evacuating from toxic, harmful, and confined work areas.

[0004] The technical solution for realizing the present invention is: a pressure differential driven emergency air supply automatic switching device for a long tube respirator, which adopts a pressure differential driven automatic switching mechanism and an orthogonal design structure of "two inlets and one outlet" three-way airway, and consists of a three-way switching cylinder, a pressure differential driving valve, a regulating spring, and a quick-connect plug.

[0005] The three-way conversion cylinder is a T-shaped structural component made of stainless steel. The three interconnected air passages adopt an orthogonal structure of "two inlets and one outlet" with inlets at both ends of the axial air passage and outlets in the radial air passage. The bottom of the axial air passage has a large-diameter main air supply valve port, and the lower part of the main air supply valve port has an internally threaded external hexagonal main air supply interface that communicates with it. The top of the axial air passage has an external thread on its outer circumference for connection with the emergency air supply valve cover. The emergency air supply valve cover has a small-diameter emergency air supply valve port at its center, and an internally threaded external hexagonal emergency air supply interface that communicates with it on the upper part of the outer top of the cover. The lower edge of the cover has an internal thread on its inner circumference. The inner top center of the cover has a valve stem control cavity that is larger than the diameter of the emergency air supply valve port and is axially connected. The valve stem control cavity has control cavity vent holes around its perimeter. The radial air passage has a gas output valve port that is orthogonally connected to the axial air passage, and the gas output valve port has an internally threaded external hexagonal gas output interface on its exterior.

[0006] The differential pressure driven valve is a cylindrical component made of stainless steel and is the core actuator for implementing the automatic switching function. The valve column has internal threaded holes at the center of its axial ends and a spring clip at its circumferential bottom. The lower part of the bottom of the valve column has a main pneumatic sealing valve plate made of silicone rubber, and the upper part of the top of the valve column has an emergency pneumatic sealing valve plate made of silicone rubber. The center of both the main pneumatic sealing valve plate and the emergency pneumatic sealing valve plate is provided with an adjusting screw that is threaded to the internal threaded hole of the valve body.

[0007] The regulating spring is a cylindrical telescopic spring whose elastic coefficient can meet the differential pressure regulation setting value, used to assist the differential pressure drive valve in making axial movement in the three-way switching cylinder.

[0008] The quick-connect connector is made of stainless steel. The end that connects to the three-way conversion cylinder interface adopts an external thread hexagonal design. There are three of them, which are respectively connected and fixed to the internal threads of the main air supply interface, emergency air supply interface, and gas output interface. It is a quick-connect connector used to connect the main air supply source, emergency air supply source and mask.

[0009] Assemble and connect the above components in the following order: First, connect the main supply pneumatic sealing valve and the emergency supply pneumatic sealing valve to the internal threaded holes of the valve body at both ends of the differential pressure drive valve using adjusting screws. Slide the regulating spring from the top to the bottom of the differential pressure drive valve and lock it with the spring clip. Insert the above components into the air passage through the open end of the axial air passage of the three-way conversion cylinder. Next, insert the valve stem control chamber of the emergency supply valve cover into the axial air passage and slide it onto the upper part of the differential pressure drive valve. Place the adjusting spring outside the valve stem control chamber. Then, connect and fix the circumferential internal thread of the emergency supply valve cover to the external thread of the open end of the axial air passage of the three-way conversion cylinder. Afterward, adjust the pressure value by rotating the adjusting screw through the main supply valve port or the emergency supply valve port using a special tool. Finally, thread and fix the three quick-connect connectors to the main supply port, the emergency supply port, and the gas output port respectively, forming a differential pressure driven emergency supply automatic switching mechanism.

[0010] Finally, the three quick-connect ports on the three-way conversion cylinder are connected to the corresponding air supply pipes and mask air ducts, respectively: the quick-connect port on the main air supply interface is connected to the quick-connect plug of the main air supply pipe of the long-tube respirator; the quick-connect port on the emergency air supply interface is connected to the quick-connect plug of the emergency air supply pipe of the portable emergency air supply source; and the quick-connect port on the gas output interface is connected to the quick-connect plug of the mask air duct, thus forming a pressure differential driven emergency air supply automatic conversion device for the long-tube respirator.

[0011] The operating mechanism of this invention is as follows: When both the main air supply source and the emergency air supply source are closed, the pressure difference within the system is zero. The extension force of the regulating spring pushes the main air supply pneumatic sealing valve plate of the differential pressure drive valve to close the main air supply valve port. During operation, the connected main air supply source and emergency air supply source (according to relevant national standards, the output pressure setting value of the air supply source pressure reducer should be within the range of 0.5MPa to 0.9MPa) must be opened simultaneously. Because the main air supply valve port is a large diameter and the emergency air supply valve port is a small diameter, and there is secondary pressure reduction resistance in the valve stem control chamber, an input pressure difference is formed between the two ends of the axial direction, that is: the input pressure at the main air supply valve port > the extension pressure of the regulating spring + the input pressure at the emergency air supply valve port. The pressure difference drives the main air supply pneumatic sealing valve plate to open the main air supply valve port, and the differential pressure drive valve simultaneously pushes the emergency air supply valve... The sealing valve plate closes the emergency air supply valve port, allowing only the gas from the main air supply source to enter the three-way orthogonal air passage through the main air supply valve port. From there, the gas flows through the gas output valve port, gas output interface, and mask air guide tube into the sealed mask for the wearer to breathe. If the main air supply source experiences insufficient pressure or interruption, the system switches to a configuration where the emergency air supply valve port input pressure + regulating spring extension force > main air supply valve port input pressure. This pressure difference drives the emergency air supply sealing valve plate to open the emergency air supply valve port, and simultaneously, the pressure difference drives the main air supply sealing valve plate to close the main air supply valve port. This allows the gas from the emergency air supply source to flow through the emergency air supply valve port, through the valve stem control chamber and control chamber vent, into the three-way orthogonal air passage, and then through the gas output valve port, gas output interface, and mask air guide tube into the sealed mask, providing uninterrupted emergency air supply to the wearer. Attached Figure Description

[0012] Figure 1 This is a front sectional view of a pressure differential driven emergency air supply automatic switching device for a long-tube breathing apparatus.

[0013] Figure 2 This is a schematic diagram of the external structure of a pressure differential driven emergency air supply automatic switching device for a long-tube respirator, connecting the main air supply pipe, the emergency air supply pipe, and the mask air duct.

[0014] In the diagram: 1. Three-way conversion cylinder; 2. Differential pressure drive valve; 3. Adjusting spring; 4. Quick-connect plug; 5. Main air supply valve port; 6. Main air supply interface; 7. Emergency air supply valve cover; 8. Emergency air supply valve port; 9. Emergency air supply interface; 10. Valve stem control chamber; 11. Control chamber vent; 12. Gas output valve port; 13. Gas output interface; 14. Internal threaded hole of valve body; 15. Spring clip; 16. Main air supply pneumatic sealing valve plate; 17. Emergency air supply pneumatic sealing valve plate; 18. Adjusting screw; 19. Main air supply pipe quick-connect plug; 20. Emergency air supply pipe quick-connect plug; 21. Mask air guide pipe quick-connect plug. Detailed Implementation

[0015] The present invention will now be further described with reference to the accompanying drawings.

[0016] like Figure 1 As shown: A pressure differential driven emergency air supply automatic switching device for a long-tube breathing apparatus adopts a pressure differential driven automatic switching mechanism and an orthogonal design structure of "two inlets and one outlet" three-way airway. It consists of a three-way switching cylinder 1, a pressure differential drive valve 2, a regulating spring 3, and a quick-connect plug 4.

[0017] The three-way conversion cylinder 1 is a T-shaped structure made of stainless steel. Its three interconnected air passages adopt a "two-in, one-out" orthogonal structure with inlets at both ends of the axial passage and outlets in the radial passage. A large-diameter main air supply valve port 5 is located at the bottom of the axial passage. Below the main air supply valve port 5 is a main air supply interface 6 with an internally threaded external hexagonal head that communicates with it. The top of the axial passage has an open outer circumferential thread for connection to the emergency air supply valve cover 7. The emergency air supply valve cover 7 has a small... An emergency gas supply valve port 8 with a diameter of 8 has an emergency gas supply interface 9 with an internal thread and an external hexagonal shape that is connected to it on the upper part of the outer top of the cover. An internal thread is provided on the lower edge of the cover in the circumferential direction. A valve stem control cavity 10 with a diameter larger than that of the emergency gas supply valve port 8 and axially connected is provided at the center of the inner top of the cover. A control cavity vent hole 11 is provided around the cavity of the valve stem control cavity 10. A gas output valve port 12 is provided in the radial air passage and is orthogonally connected to the axial air passage. An internal thread and an external hexagonal gas output interface 13 is provided on the outside of the gas output valve port 12.

[0018] The differential pressure driven valve 2 is a cylindrical component made of stainless steel and is the core actuator for implementing the automatic switching function. The valve column has internal threaded holes 14 at the center of its two axial ends and a spring clip 15 at its circumferential bottom. The lower part of the bottom of the valve column has a main pneumatic sealing valve plate 16 made of silicone rubber, and the upper part of the top of the valve column has an emergency pneumatic sealing valve plate 17 made of silicone rubber. The center of both the main pneumatic sealing valve plate 16 and the emergency pneumatic sealing valve plate 17 is provided with an adjusting screw 18 that is threaded to the internal threaded hole 14 of the valve column.

[0019] The regulating spring 3 is a cylindrical telescopic spring whose elastic coefficient can meet the differential pressure regulation setting value, which is used to assist the differential pressure drive valve 2 in making axial movement in the three-way conversion cylinder 1.

[0020] The quick-connect connector 4 is made of stainless steel. The end that connects to the interface of the three-way conversion cylinder 1 adopts an external thread hexagonal design. There are three of them, which are respectively connected and fixed to the internal threads of the main air supply interface 6, the emergency air supply interface 9, and the gas output interface 13. It is a quick-connect connector used to connect the main air supply source, the emergency air supply source and the mask.

[0021] Assemble and connect the above components in the following order: First, connect the main pneumatic sealing valve plate 16 and the emergency pneumatic sealing valve plate 17 to the threaded holes 14 in the valve body at both ends of the differential pressure drive valve 2 via adjusting screws 18. Then, slide the regulating spring 3 from the top to the bottom of the differential pressure drive valve 2 and lock it with the spring clip 15. Finally, insert the above components into the axial air passage through the open top of the three-way conversion cylinder 1. Next, insert the valve stem control chamber 10 of the emergency air supply valve cover 7 into the axial air passage and slide it onto the differential pressure valve. The upper part of the drive valve 2 and the regulating spring 3 are spaced outside the valve stem control chamber 10. Then, the circumferential internal thread of the lower edge of the emergency air supply valve cover 7 is connected and fixed to the external thread of the open end of the axial air passage of the three-way conversion cylinder 1. After that, the pressure value is adjusted by rotating the adjusting screw 18 with a special tool through the main air supply valve port 5 or the emergency air supply valve port 8. Then, the three quick-connect plugs 4 are respectively threaded and fixed to the main air supply interface 6, the emergency air supply interface 9 and the gas output interface 13 to form a differential pressure driven emergency air supply automatic conversion mechanism.

[0022] like Figure 2 As shown: A pressure differential driven emergency air supply automatic switching device for a long-tube respirator, wherein the three quick-connect plugs 4 on the three-way switching cylinder 1 are respectively connected to the corresponding air supply pipe and mask air guide pipe, that is: the quick-connect plug 4 on the main air supply interface 6 is connected to the quick-connect plug 19 of the main air supply pipe of the long-tube respirator, the quick-connect plug 4 on the emergency air supply interface 9 is connected to the quick-connect plug 20 of the emergency air supply pipe of the portable emergency air supply source, and the quick-connect plug 4 on the gas output interface 13 is connected to the quick-connect plug 21 of the mask air guide pipe, thus constituting a pressure differential driven emergency air supply automatic switching device for a long-tube respirator.

[0023] The operating mechanism of this invention is as follows: When both the main gas supply source and the emergency gas supply source are closed, the pressure difference within the system is zero. The extension force of the regulating spring 3 pushes the main gas supply pneumatic sealing valve plate 16 of the differential pressure drive valve 2 to close the main gas supply valve port 5. During operation, the main gas supply source and the emergency gas supply source (according to relevant national standards, the output pressure setting value of the gas supply source pressure reducer should be within the range of 0.5MPa to 0.9MPa) must be opened simultaneously. Because the main gas supply valve port 5 is a large diameter and the emergency gas supply valve port 8 is a small diameter, and there is secondary pressure reduction resistance from the valve stem control chamber 10, an input pressure difference is formed between the two ends of the axial flow, that is: the input pressure of the main gas supply valve port 5 > the extension pressure of the regulating spring 3 + the input pressure of the emergency gas supply valve port 8. The pressure difference drives the main gas supply pneumatic sealing valve plate 16 to open the main gas supply valve port 5, and the differential pressure drive valve 2 simultaneously pushes the emergency gas supply pneumatic sealing valve plate 17. The emergency gas supply valve 8 is closed, allowing only the gas from the main gas supply source to enter the three-way orthogonal airway through the main gas supply valve 5. The gas then passes through the gas output valve 12, gas output interface 13, and mask air duct to the sealed mask for the wearer's breathing. If the main gas supply source experiences insufficient pressure or interruption, the system switches to: Emergency gas supply valve 8 input pressure + regulating spring 3 extension force > main gas supply valve 5 input pressure. The pressure difference drives the emergency gas supply dynamic sealing valve 17 to open the emergency gas supply valve 8, and the pressure difference drives valve 2 to simultaneously push the main gas supply dynamic sealing valve 16 to close the main gas supply valve 5. This allows the gas from the emergency gas supply source to enter the three-way orthogonal airway through the emergency gas supply valve 8 via the valve stem control chamber 10 and control chamber vent 11, then through the gas output valve 12, gas output interface 13, and mask air duct to the sealed mask, providing uninterrupted emergency gas supply to the wearer.

[0024] The beneficial effects of this invention are as follows: A pressure differential driven emergency air supply automatic switching device for long-tube respirators allows workers to enter toxic, harmful, or confined spaces while wearing the respirator. They only need to open the portable emergency air supply cylinder valve. During operation, there is no need to consider or observe the safety and effectiveness of the main air supply or the remaining protection time. If the main air supply malfunctions, resulting in insufficient or interrupted air supply, the emergency air supply mechanism automatically activates without prompting or handling from the main air supply supervisor or manual operation. This provides uninterrupted and timely emergency air supply, ensuring safe and effective respiratory protection for workers within the rated emergency respiratory protection time. Simultaneously, the equipped alarm will sound, prompting the worker to immediately unplug the main air supply quick-connect plug 19 and quickly evacuate the toxic, harmful, or confined work area while still under the protection of the portable emergency air supply.

Claims

1. A pressure differential driven emergency air supply automatic switching device for a long-tube breathing apparatus, characterized in that: The device adopts a differential pressure driven automatic switching mechanism and a "two-in-one-out" three-way air passage orthogonal design structure, consisting of a three-way switching cylinder (1), a differential pressure driven valve (2), a regulating spring (3), and a quick-connect plug (4). The three-way switching cylinder (1) has a large-diameter main air supply valve port (5) at the bottom of the axial air passage and a main air supply interface (6) at the lower part of the bottom. The emergency air supply valve cover (7) has a small-diameter emergency air supply valve port (8) at its center, an emergency air supply interface (9) at the top of the cover, and a valve stem control chamber (10) and a control chamber vent (11) at the center of the top of the cover. The radial air passage has a gas output. The valve port (12) and gas output interface (13) are provided. The center of the cross-section of the differential pressure drive valve (2) at both ends of the axial direction is provided with a valve body threaded hole (14). The bottom end of the axial direction is provided with a spring bracket (15). The lower part of the bottom end of the axial direction is provided with a main supply pneumatic sealing valve plate (16). The upper part of the top end of the axial direction is provided with an emergency supply pneumatic sealing valve plate (17). The center of each valve plate is provided with an adjusting screw (18). The regulating spring (3) is a cylindrical telescopic spring. The quick-connect socket (4) adopts an external thread hexagonal design and is configured with three. Assemble and connect the components in the following order: the main supply pneumatic sealing valve plate (16) and the emergency supply pneumatic sealing valve plate (17). The sealing plate (17) is rotatably connected to the internal threaded holes (14) of the valve body at both ends of the differential pressure drive valve (2) via adjusting screws (18). The regulating spring (3) is sleeved from the top end of the differential pressure drive valve (2) to the bottom end and locked with the spring clip (15). The above components are placed into the air passage through the open top end of the axial air passage of the three-way conversion cylinder (1). The valve stem control chamber (10) of the emergency air supply valve cover (7) is placed into the axial air passage and sleeved on the upper part of the differential pressure drive valve (2). The regulating spring (3) is sleeved outside the valve stem control chamber (10). The internal thread of the lower edge of the emergency air supply valve cover (7) is connected to the three-way conversion cylinder. (1) The axial airway is fixed with an open external thread at the top. The pressure value is adjusted by rotating the adjusting screw (18) through the main air supply valve port (5) or the emergency air supply valve port (8). The three quick-connect plugs (4) are connected and fixed to the main air supply interface (6), the emergency air supply interface (9) and the gas output interface (13) respectively. Finally, the three quick-connect plugs (4) provided on the three-way conversion cylinder (1) are connected to the corresponding main air supply pipe quick-connect plug (19), emergency air supply pipe quick-connect plug (20) and mask air duct quick-connect plug (21) respectively to form a long tube respirator pressure differential driven emergency air supply automatic conversion device.

2. The pressure differential driven emergency air supply automatic switching device for a long-tube breathing apparatus according to claim 1, characterized in that: a three-way valve... The conversion cylinder (1) is a T-shaped structure made of stainless steel. The three interconnected air passages adopt an orthogonal structure of "two inlets and one outlet" with inlets at both ends of the axial air passage and outlets in the radial air passage. The bottom of the axial air passage is provided with a large-diameter main air supply valve port (5). The lower part of the main air supply valve port (5) is provided with a main air supply interface (6) with an internal thread and an external hexagonal head that communicates with it. The top of the axial air passage is open and has an external thread on its outer circumference for connection with the emergency air supply valve cover (7). The center of the emergency air supply valve cover (7) is provided with a small-diameter emergency air supply valve. The gas supply valve port (8) has an emergency gas supply interface (9) with an internal thread and an external hexagonal shape that is connected to it on the upper part of the outer top of the cover. The lower edge of the cover has an internal thread in the circumferential direction. The center of the inner top of the cover has a valve stem control cavity (10) that is larger than the diameter of the emergency gas supply valve port (8) and is axially connected. The valve stem control cavity (10) has a control cavity vent hole (11) around its cavity. The radial air passage has a gas output valve port (12) that is orthogonally connected to the axial air passage. The gas output valve port (12) has an internal thread and an external hexagonal shape gas output interface (13) on its outside.

3. The automatic emergency air supply switching device driven by differential pressure for a long-tube breathing apparatus according to claim 1, characterized in that: The differential pressure driven valve (2) is a cylindrical component made of stainless steel. It is the core actuator for implementing the automatic switching function. The valve column has internal threaded holes (14) at the center of the cross-sections at both ends in the axial direction. The bottom end of the valve column is provided with a spring clip (15) in the circumferential direction. The lower part of the bottom end of the valve column is provided with a main pneumatic sealing valve plate (16) made of silicone rubber. The upper part of the top end of the valve column is provided with an emergency pneumatic sealing valve plate (17) made of silicone rubber. The center of the main pneumatic sealing valve plate (16) and the emergency pneumatic sealing valve plate (17) is provided with an adjusting screw (18) that is threaded to the internal threaded hole (14) of the valve column.

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