Electric control indirect type valve structure and breathing mask

Abstract

The electrically-controlled indirect valve structure comprises a shell, a main valve assembly, a pressure sensor and an electromagnetic valve, an air inlet channel, an oxygen inlet channel, a breathing cavity and a control cavity are formed in the shell, the inlet end of the air inlet channel is connected with the oxygen inlet channel, and the outlet end of the air inlet channel is used for being connected with the breathing mask; the main valve assembly is arranged at the inlet end of the air inlet channel, the control cavity is arranged on the inner side face of the main valve assembly, the pressure sensor is arranged in a breathing cavity communicated with the mask, the control cavity is connected with an exhaust channel, the exhaust channel is communicated with the atmospheric environment through an electromagnetic valve, and the pressure sensor is connected with the electromagnetic valve. The electromagnetic valve controls the pressure in the control cavity of the main valve assembly to achieve opening and closing of the main valve assembly, the problem that a mechanical indirect valve is difficult to debug is solved, and the structure is simple and reliable.

Description

Technical Field

[0001] The present invention particularly relates to an electrically controlled indirect valve structure and a breathing mask. Background Art

[0002] Currently, mechanical indirect regulators use a composite diaphragm to seal a flow-limiting orifice to open and close the valve. To ensure a tight seal, a spring force is applied to the composite diaphragm. This current structure suffers from a problem: when the spring force is high, the sealing effect is good, but the suction resistance is high; when the spring force is low, the suction resistance is low, but the sealing is poor. Achieving a balance between these two factors makes structural adjustment difficult and the product qualification rate low. Summary of the Invention

[0003] The purpose of the present invention is to provide an electrically controlled indirect valve structure and a breathing mask, which controls the pressure in the control chamber of the main valve assembly by an electromagnetic valve to realize the opening and closing of the main valve assembly, thereby solving the problem of difficult debugging of mechanical indirect valves and having a simple and reliable structure.

[0004] The technical solution adopted in the present invention is:

[0005] An electrically controlled indirect valve structure includes a housing, a main valve assembly, a pressure sensor, and a solenoid valve. The housing is provided with an air intake channel, an oxygen intake channel, a breathing chamber, and a control chamber. The inlet end of the air intake channel is connected to the oxygen intake channel, and the outlet end of the air intake channel is used to connect to a breathing mask. The main valve assembly is disposed in the air intake channel, with the air intake channel and the oxygen intake channel disposed on one side of the main valve assembly, and the control chamber disposed on the other side of the main valve assembly. The pressure sensor is disposed in the breathing chamber connected to the mask, and the control chamber is connected to an exhaust channel, which is connected to the atmosphere via a solenoid valve. The pressure sensor is connected to the solenoid valve. When inhaling, the pressure sensor detects negative pressure, the solenoid valve connects the control chamber to the atmosphere, the main valve assembly opens, and oxygen enters the mask through the main valve assembly for breathing. When exhaling, the pressure sensor detects positive pressure, the solenoid valve disconnects the control chamber from the atmosphere, the pressure in the control chamber increases, the main valve assembly closes, and oxygen cannot enter the mask, thereby achieving flow regulation.

[0006] Preferably, a first flow limiting hole is connected between the control chamber and the oxygen inlet channel.

[0007] Preferably, the main valve assembly includes a main valve and a main valve seat, the main valve seat is arranged at the inlet end of the air intake channel, and the main valve is arranged above the main valve seat; when the main valve assembly closes the air intake channel, the main valve is pressed down on the valve seat through the upper and lower pressure differences of the main valve, blocking the inlet of the air intake channel; when the main valve assembly opens the air intake channel, the main valve is arched and separated from the main valve seat through the upper and lower pressure differences of the main valve.

[0008] Preferably, the cross section of the main valve is arc-shaped or arch-shaped.

[0009] Preferably, a nozzle is provided in the air inlet passage.

[0010] Preferably, the pressure relief port of the breathing chamber is provided with a control valve, the breathing chamber is arranged on one side of the control valve, and a residual pressure chamber is provided on the other side of the control valve. A second flow limiting hole is connected between the residual pressure chamber and the oxygen inlet channel, and a residual pressure valve is provided on the second flow limiting hole. The residual pressure valve is connected to an emergency residual pressure test button, and the residual pressure valve is used to block the second flow limiting hole. The emergency residual pressure test button is used to open the residual pressure valve to block the second flow limiting hole by pressing.

[0011] The limited flow hole is designed to introduce gas into the control cavity and the upper cavity of the composite diaphragm.

[0012] Preferably, the residual pressure chamber is connected to an exhaust channel, and a pressure-limiting valve is provided in the exhaust channel.

[0013] Preferably, the control valve includes a composite diaphragm, a composite valve seat and a spring. The composite diaphragm is connected to the spring. The composite valve seat is arranged at the air relief port. The composite diaphragm is correspondingly arranged above the composite valve seat. When the composite diaphragm is pressed down to the composite valve seat, the pressure relief port is closed. When the composite diaphragm is arched and separated from the composite valve seat, the pressure relief port is opened. The composite diaphragm is used to discharge gas into the atmosphere, and the spring is used to reset the composite diaphragm. The valve is easy to debug.

[0014] Preferably, the composite valve seat is an annular protrusion, and an annular shielding piece is provided on the lower side of the composite diaphragm. When the composite diaphragm is pressed down to the composite valve seat, the annular shielding piece is sleeved on the inner or outer side of the annular protrusion, which can better form a seal for the pressure relief port.

[0015] Furthermore, the cross-sections of the composite valve seat and the main valve seat are both knife-edge shaped.

[0016] A breathing mask comprises the above-mentioned electrically controlled indirect valve structure, wherein the outlet end of the air inlet passage of the electrically controlled indirect valve structure is communicated with the breathing mask, and the oxygen air inlet passage of the electrically controlled indirect valve structure is connected to an oxygen supply device.

[0017] The dimensions of the main valve and composite diaphragm are designed based on the flow range and regulation requirements, and a blade is placed at the main valve's closed position. A solenoid valve and pressure sensor are included to facilitate debugging. During inhalation, the solenoid valve opens, exhausting the gas in the control chamber to the atmosphere and opening the main valve to supply air. During respiration, the solenoid valve closes, the main valve closes, and the composite diaphragm opens, exhausting the gas to the atmosphere.

[0018] The beneficial effects of the present invention are:

[0019] An electrically controlled indirect valve structure is adopted, and the pressure in the control chamber is controlled by a solenoid valve to realize the opening and closing of the main valve assembly, which solves the difficulty of debugging the mechanical indirect valve. The structure is simple and reliable, and it can be used in combination with electronic control to realize flow control by controlling the opening and closing of the main valve assembly through the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a schematic structural diagram of an electrically controlled indirect valve structure in an embodiment of the present invention.

[0021] Figure 2 2 is a schematic structural diagram of an electrically controlled indirect valve structure in an intake state according to an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the structure of the electrically controlled indirect valve in the exhalation state in an embodiment of the present invention.

[0023] Figure 4 1 is a diagram showing the working principle of the residual pressure valve in an embodiment of the present invention.

[0024] In the figure: 1. First flow limiting hole; 2. Second flow limiting hole; 3. Residual pressure valve; 4. Composite diaphragm; 5. Spring; 6. Pressure sensor; 7. Breathing chamber; 8. Housing; 9. Main valve; 10. Control chamber; 11. Solenoid valve; 12. Nozzle; 13. Dilution pipe; 14. Residual pressure chamber; 15. Pressure limiting valve; 16. Emergency residual pressure test button; 17. Oxygen concentration selection switch; 18. Oxygen inlet; 19. Air inlet; 20. Vacuum membrane box; 21. Control valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0028] Example 1

[0029] An electrically controlled indirect valve structure, such as Figures 1-3As shown, it includes a shell 8, a main valve assembly, a pressure sensor 6 and a solenoid valve 11. The shell 8 is provided with an air intake channel, an oxygen air intake channel, a breathing chamber 7 and a control chamber 10. The inlet end of the air intake channel is connected to the oxygen air intake channel, and the outlet end of the air intake channel is connected to the breathing mask through a dilution pipe 13. The dilution pipe 13 is arranged only on one side of the breathing chamber 7 and is connected to the breathing chamber 7 through the breathing mask. A vacuum membrane box 20 is provided on one side of the dilution pipe 13, and the vacuum membrane box 20 is connected to the air inlet 19. The main valve assembly is arranged in the air intake channel, the air intake channel and the oxygen air intake channel are arranged on one side of the main valve assembly, and the control chamber 10 is arranged on the other side of the main valve assembly. The pressure sensor 6 is arranged in the breathing chamber 7 connected to the mask, and the control chamber 10 is connected to the exhaust channel. The exhaust channel is connected to the atmospheric environment through the solenoid valve 11, and the pressure sensor 6 is connected to the solenoid valve 11. When inhaling, the pressure sensor detects negative pressure, the solenoid valve 11 connects the control chamber 10 to the atmosphere, the main valve assembly opens, and oxygen enters the mask through the main valve assembly for people to breathe; when exhaling, the pressure sensor detects positive pressure, the solenoid valve 11 disconnects the control chamber 10 from the atmosphere, the pressure in the control chamber 10 increases, the main valve assembly closes, and oxygen cannot enter the mask, thereby achieving flow regulation.

[0030] Furthermore, a first flow limiting hole 1 is connected between the control chamber 10 and the oxygen inlet channel.

[0031] Example 2

[0032] The main valve assembly is further limited on the basis of Example 1, and the performance of Example 2 after the limitation is even better.

[0033] The main valve assembly includes a main valve 9 and a main valve seat. The main valve seat is arranged at the inlet end of the air intake channel, and the main valve 9 is arranged above the main valve seat. When the main valve assembly closes the air intake channel, the upper and lower pressure differences of the main valve 9 cause the main valve 9 to be pressed down on the valve seat to block the inlet of the air intake channel. When the main valve assembly opens the air intake channel, the upper and lower pressure differences of the main valve 9 cause the main valve 9 to be arched and separated from the main valve seat.

[0034] Furthermore, the cross section of the main valve 9 is arc-shaped or arch-shaped.

[0035] Furthermore, a nozzle 12 is provided in the air intake passage between the main valve assembly and the outlet end of the air intake passage.

[0036] Furthermore, the pressure relief port of the breathing chamber 7 is provided with a control valve 21, the breathing chamber 7 is arranged on one side of the control valve 21, and the other side of the control valve 21 is provided with a residual pressure chamber 14, and a second flow limiting hole 2 is connected between the residual pressure chamber 14 and the oxygen inlet channel. A residual pressure valve 3 is provided on the second flow limiting hole 2, and the residual pressure valve 3 is connected to an emergency residual pressure test button 16. The residual pressure valve 3 is used to block the second flow limiting hole 2, and the emergency residual pressure test button 16 is used to open the residual pressure valve 3 to block the second flow limiting hole 2 by pressing.

[0037] The limited flow hole is designed to introduce gas into the control chamber 10 and the residual pressure chamber 14 on the upper part of the composite diaphragm 4.

[0038] Furthermore, the residual pressure chamber 14 is connected to an exhaust channel, and a pressure limiting valve 15 is provided in the exhaust channel.

[0039] Furthermore, the control valve 21 includes a composite diaphragm 4, a composite valve seat and a spring 5. The composite diaphragm 4 is connected to the spring 5. The composite valve seat is arranged at the pressure relief port. The composite diaphragm 4 is correspondingly arranged above the composite valve seat. When the composite diaphragm 4 is pressed down to the composite valve seat, the pressure relief port is closed. When the composite diaphragm 4 is arched and separated from the composite valve seat, the pressure relief port is opened. The composite diaphragm 4 is used to discharge gas into the atmosphere, and the spring is used to reset the composite diaphragm 4. The valve is easy to debug.

[0040] Furthermore, the composite valve seat is an annular protrusion, and the lower side of the composite diaphragm 4 is provided with an annular shielding piece. When the composite diaphragm 4 is pressed down to the composite valve seat, the annular shielding piece is sleeved on the inner or outer side of the annular protrusion, which can better form a seal for the pressure relief port.

[0041] Furthermore, the cross-sections of the composite valve seat and the main valve seat are both knife-edge shaped.

[0042] The oxygen inlet channel is connected to an oxygen inlet port 18 , a microphone is provided in the breathing cavity 7 , and the oxygen inlet port 18 is provided with an oxygen concentration selection switch 17 for opening and closing the oxygen inlet port 18 according to the oxygen concentration.

[0043] A breathing mask comprises the above-mentioned electrically controlled indirect valve structure, wherein the outlet end of the air inlet passage of the electrically controlled indirect valve structure is communicated with the breathing mask, and the oxygen air inlet passage of the electrically controlled indirect valve structure is connected to an oxygen supply device.

[0044] The dimensions of the main valve 9 and composite diaphragm 4 are designed based on the flow range and regulation requirements, and a knife edge is placed at the closed position of the main valve 9. To facilitate debugging, a solenoid valve 11 and a pressure sensor are included. During inhalation, the solenoid valve 11 opens, exhausting the gas in the control chamber 10 to the atmosphere and opening the main valve 9 to supply air. During exhalation, the solenoid valve 11 closes, the main valve 9 closes, and the composite diaphragm 4 opens, exhausting the gas to the atmosphere.

[0045] The working principle of the present invention: Figure 1 During the mask operation, gas enters from the right side of housing 8. At this point, both the upper and lower portions of main valve 9 are subjected to pressure from the oxygen inlet passage. However, because the pressure-dependent area of ​​the upper portion (i.e., the control chamber) is larger than the pressure-dependent area of ​​the lower portion, the force acting on the upper portion of main valve 9 is greater than that on the lower portion. This pressure differential between the upper and lower portions of main valve 9 presses downward against the valve seat, keeping it closed. This prevents oxygen from passing through the valve and entering the mask via nozzle 12. When a person inhales, requiring valve air supply, pressure sensor 6 senses negative pressure, energizing solenoid valve 11 and connecting control chamber 10 to the atmosphere. However, because the first flow restriction orifice 1 limits the flow of gas into control chamber 10, any gas that does enter is rapidly discharged through solenoid valve 11 into the atmosphere, preventing pressure from building up within control chamber 10. At this point, the pressure above main valve 9 (i.e., within control chamber 10) is significantly lower than the pressure at the lower oxygen inlet. Due to the pressure differential, main valve 9 deforms and arches upward, disengaging from the valve seat and opening. When the main valve 9 opens, oxygen from the oxygen inlet passes through it and enters the mask through the nozzle 12. When inhalation ends or during exhalation, and the pressure sensor 6 detects no negative pressure, the solenoid valve 11 disconnects the control chamber 10 from the atmosphere. Oxygen enters the control chamber 10 through the first flow restriction 1, building pressure there. Both the upper and lower portions of the main valve 9 are affected by the oxygen inlet pressure. However, because the pressure-dependent area of ​​the upper portion (i.e., the control chamber 10) is greater than the pressure-dependent area of ​​the lower portion, the force on the upper portion of the main valve 9 is greater than the force on the lower portion. The pressure differential between the upper and lower portions of the main valve 9 forces it downward back onto the valve seat, keeping it closed. This prevents oxygen from entering the mask through the nozzle 12 and stopping oxygen supply. During exhalation, positive pressure builds up within the breathing chamber 7. At this time, there is a pressure difference between the upper and lower parts of the composite diaphragm 4. Under the action of this pressure difference, the edge of the composite diaphragm 4 deforms and arches upward and separates from the valve seat. The gas in the breathing chamber 7 can be discharged into the ambient atmosphere through the gap between the composite diaphragm 4 and the valve seat. Figure 2 shown.

[0046] like Figure 4 As shown, when the user manually rotates the emergency residual pressure test button 16, presses it, and locks it, the emergency residual pressure test button 16 completely closes the passage between the residual pressure chamber 14 and the outside atmosphere. At the same time, it also pushes up the spring inside the residual pressure chamber 14, thereby opening the residual pressure valve 3. At this time, oxygen from the oxygen inlet passes through the second flow restriction hole 2 to the residual pressure valve 3, and then enters the residual pressure chamber 14 through the opened residual pressure valve 3.

[0047] Because the emergency residual pressure test button 16 completely blocks the passage between the residual pressure chamber 14 and the outside atmosphere, the gas in the residual pressure chamber 14 cannot be discharged into the atmosphere, thereby building up a positive pressure in the residual pressure chamber 14. When the pressure in the residual pressure chamber 14 exceeds the opening pressure of the pressure-limiting valve 15, the pressure-limiting valve 15 opens, and the oxygen in the residual pressure chamber 14 is discharged into the atmosphere through the pressure-limiting valve 15.

[0048] Because the second flow limiting hole 2 limits the gas flow entering the residual pressure chamber 14, and the flow at the pressure limiting valve 15 is greater than the flow of the second flow limiting hole 2, the pressure in the residual pressure chamber 14 will be stabilized near the opening pressure of the pressure limiting valve 15.

[0049] When positive pressure builds up in residual-pressure chamber 14, a pressure differential develops between the upper portion (i.e., the residual-pressure chamber) and the lower portion (i.e., the breathing chamber) of composite diaphragm 4. This pressure differential causes composite diaphragm 4 to deform downward, overcoming the spring force, and opening control valve 21. Gas in the control chamber then flows through open control valve 21 into the residual-pressure chamber and is then discharged into the atmosphere through open pressure-limiting valve 15.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An electrically controlled indirect valve structure, characterized in that: The invention comprises a housing (8), a main valve assembly, a pressure sensor (6) and a solenoid valve (11); an air intake channel, an oxygen intake channel, a breathing chamber (7) and a control chamber are provided in the housing (8); the inlet end of the air intake channel is connected to the oxygen intake channel, the outlet end of the air intake channel is used to connect to the breathing mask, the main valve assembly is arranged at the inlet end of the air intake channel, the control chamber is arranged on the inner side of the main valve assembly, the pressure sensor (6) is arranged in the breathing chamber (7) connected to the mask, the control chamber is connected to the exhaust channel, the exhaust channel is connected to the atmospheric environment through the solenoid valve (11), and the pressure sensor (6) is connected to the solenoid valve (11).

2. The electrically controlled indirect valve structure according to claim 1, wherein: A first flow limiting hole (1) is connected between the control chamber and the oxygen inlet channel.

3. The electrically controlled indirect valve structure according to claim 1, wherein: The main valve assembly comprises a main valve (9) and a main valve seat, wherein the main valve seat is arranged at the inlet end of the air intake passage, and the main valve (9) is arranged above the main valve seat; when the main valve assembly closes the air intake passage, the main valve is pressed down on the valve seat by the upper and lower pressure difference of the main valve, thereby blocking the inlet of the air intake passage; when the main valve assembly opens the air intake passage, the main valve is arched by the upper and lower pressure difference of the main valve, thereby separating from the main valve seat.

4. The electrically controlled indirect valve structure according to claim 3, wherein: The cross section of the main valve is arc-shaped or arched.

5. The electrically controlled indirect valve structure according to claim 1, wherein: A nozzle (12) is provided in the air intake passage.

6. The electrically controlled indirect valve structure according to claim 1, wherein: The pressure relief port of the breathing chamber is provided with a control valve, the breathing chamber is arranged on one side of the control valve, a residual pressure chamber is provided on the other side of the control valve, a second flow limiting hole (2) is connected between the residual pressure chamber and the oxygen inlet passage, a residual pressure valve (3) is provided on the second flow limiting hole (2), the residual pressure valve (3) is connected to an emergency residual pressure test button, the residual pressure valve (3) is used to block the second flow limiting hole (2), and the emergency residual pressure test button is used to open the residual pressure valve (3) to block the second flow limiting hole (2) by actuating the emergency residual pressure test button.

7. The electrically controlled indirect valve structure according to claim 6, wherein: The residual pressure chamber is connected to an exhaust channel, and a pressure limiting valve is arranged in the exhaust channel.

8. The electrically controlled indirect valve structure according to claim 6, wherein: The control valve comprises a composite diaphragm (4), a composite valve seat and a spring (5), the composite diaphragm (4) is connected to the spring (5), the composite valve seat is arranged at the pressure relief port, and the composite diaphragm (4) is correspondingly arranged above the composite valve seat. When the composite diaphragm (4) is pressed down to the composite valve seat, the pressure relief port is closed, and when the composite diaphragm (4) is arched and separated from the composite valve seat, the pressure relief port is opened.

9. The electrically controlled indirect valve structure according to claim 8, wherein: The composite valve seat is an annular protrusion, and an annular shielding piece is provided on the lower side of the composite diaphragm (4). When the composite diaphragm (4) is pressed down to the composite valve seat, the annular shielding piece is sleeved on the inner side or the outer side of the annular protrusion.

10. A breathing mask, characterized in that: It comprises the electrically controlled indirect valve structure according to any one of claims 1 to 9, wherein the outlet end of the air inlet channel of the electrically controlled indirect valve structure is connected to the breathing mask, and the oxygen air inlet channel of the electrically controlled indirect valve structure is connected to the oxygen supply device.

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