A breathing valve and a protective mask

Abstract

The present invention discloses a breathing valve and a protective mask, wherein the breathing valve comprises: a breathing valve housing, including a base, and a shell detachably connected to the base; a valve core, wherein the valve core is fixed in the breathing valve housing, and comprises a nano-metal filter, a seal with electronegativity and a conductive electrode sequentially stacked on the surface of the nano-metal filter; the nano-metal filter is fixed on the base; and a monitoring device, wherein the monitoring device is electrically connected to the nano-metal filter and the conductive electrode, respectively. By utilizing the periodic contact and separation output electrical signals of the seal with electronegativity with the nano-metal filter in the two stages of exhalation and inhalation, the accumulation of pollutants on the nano-metal filter can be determined by monitoring the electrical signals, thereby easily determining whether the filter needs to be replaced, and avoiding waste caused by frequent replacement of the filter.

Description

Technical Field

[0001] The invention relates to the technical field of personal protection, and in particular to a breathing valve seat and a protective mask. Background Art

[0002] Masks, as a commonly used protective equipment, can effectively filter the air entering the mouth and nasal cavity, prevent harmful germs, dust, haze and other substances from contacting the mouth and nose, and are a powerful means of pollution protection.

[0003] Currently, commonly used protective masks include disposable, breathing valve, filter, etc., most of which use activated carbon filter layers to absorb pollutants. However, as the adsorption time increases, pollutants accumulate on the surface of the mask filter layer, and the protective ability of the mask gradually decreases, and the mask or internal filter needs to be replaced. However, existing masks cannot determine the content of adsorbents on the surface of the mask filter layer, which makes it easy to replace the mask filter layer too frequently, resulting in waste.

[0004] Therefore, the existing technology needs to be further improved. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a breathing valve and a protective mask, which are used to solve the problem of unreasonable replacement of the filter layer in the existing protective mask or the protective mask.

[0006] In a first aspect, an embodiment of the present invention provides a breathing valve, comprising:

[0007] A breathing valve housing, comprising a base and a shell detachably connected to the base;

[0008] A valve core, the valve core is fixed in the breathing valve housing, and comprises a nano metal filter, a seal with electronegativity and a conductive electrode stacked in sequence on the surface of the nano metal filter; the nano metal filter is fixed on the base; and

[0009] A monitoring device is electrically connected to the nano metal filter and the conductive electrode. Optionally, in the breathing valve, the surface of the sealing member facing the nano metal mesh is provided with an array microstructure.

[0010] Optionally, in the breathing valve, the base comprises: a stepped body and a fixed guide member fixed on the stepped body, and the valve core is arranged on the fixed guide member.

[0011] Optionally, the breathing valve, wherein the step-shaped body includes: a first step portion and a second step portion, the first step portion is fixedly connected to the second step portion, and a through channel is opened in the middle of the first step portion and the second step portion; and a plurality of bosses are fixed on the inner side wall of the second step portion.

[0012] Optionally, in the breathing valve, the nano metal filter comprises a plurality of staggered and stacked nano metal meshes.

[0013] Optionally, in the breathing valve, the porosity of the nano metal mesh is 10-300ppi. Optionally, in the breathing valve, the metal mesh comprises: a plurality of metal wires, the diameter of the metal wires is 150-1000μm; the metal wires comprise an alloy electroplating layer, the thickness of the alloy electroplating layer is 100-800μm.

[0014] Optionally, in the breathing valve, the array microstructure is a geometric array microstructure, and the geometric body is selected from one or more of a pyramid, a cone, and a V-shape.

[0015] Optionally, in the breathing valve, the shell includes an end cover having an accommodating cavity, and the end cover is provided with a plurality of air permeable channels.

[0016] In a second aspect, a protective mask comprises the breathing valve described above.

[0017] Beneficial effects: The embodiment of the present invention provides a breathing valve, including a breathing valve housing and a valve core arranged in the breathing valve housing, wherein the valve core includes a nano-metal filter and a seal adapted to the nano-metal filter, and an electrode for conducting electricity is provided on the seal, and a monitoring device is electrically connected to the conductive electrode and the nano-metal filter through a wire. The electronegative seal is used to periodically contact and separate the output electrical signal with the nano-metal filter in the two stages of exhalation and inhalation. By monitoring the electrical signal, the accumulation of pollutants on the nano-metal filter can be determined, so that it can be easily determined whether the filter needs to be replaced, and waste caused by frequent replacement of the filter can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of a breathing valve provided by an embodiment of the present invention;

[0019] Figure 2 An exploded view of a breathing valve provided in an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the base structure;

[0021] Figure 4 It is a schematic diagram of the shell structure;

[0022] Figure 5 This is the SEM image of the metal wire surface;

[0023] Figure 6This is the SEM image of the seal surface. DETAILED DESCRIPTION

[0024] The present invention provides a breathing valve and a protective mask. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] like Figure 1 to Figure 2 As shown, an embodiment of the present invention provides a breathing valve, including: a breathing valve housing 10, a valve core 20 arranged inside the breathing valve housing 10, and a monitoring device 30 for monitoring the valve core 20. The valve core 20 includes a nano-metal filter 21, an electronegative seal 22, and a conductive electrode 23, and the monitoring device 30 is electrically connected to the nano-metal filter 21 and the conductive electrode 23 through a wire 31. It should be noted that the monitoring device 30 is mainly used to monitor the nano-metal filter (the electrical signal generated).

[0027] In this embodiment, the nano-metal filter can be used to adsorb pollutants and filter the air. The nano-metal filter is periodically in friction contact with the negatively charged seal to generate an electrical signal, which is monitored by the monitoring device. As the pollutants are deposited on the nano-metal filter, the electrical signal monitored by the monitoring device will weaken. When it weakens to a certain extent, it can be determined that there are many particulate pollutants on the nano-metal filter, and the nano-metal filter or the breathing valve needs to be replaced, thereby avoiding the waste caused by frequent replacement. Among them, an electrical signal threshold can be set in advance according to experiments. When the electrical signal monitored by the monitoring device is less than or equal to the electrical signal threshold, it means that there are many pollutant particles deposited on the metal filter, and the conditions for replacement have been met.

[0028] Exemplarily, the monitoring device is a voltage monitoring device. When there are no pollutant particles adsorbed on the nano-metal filter of the breathing valve, the voltage value monitored is 2.7V. The voltage threshold is set to 0.8V. That is, when the monitoring device detects that the voltage is less than or equal to 0.8V, an alarm is issued to remind the wearer to replace the nano-metal filter or replace a new breathing valve seat as soon as possible to avoid affecting normal use.

[0029] like Figure 3As shown, in one implementation of this embodiment, the breathing valve housing 10 includes a base 11 and a shell 12 detachably connected to the base 11, and the detachable connection can be a snap connection or a threaded connection. The base 11 includes a stepped body 110 and a fixed guide 120 fixed to the stepped body 110. During assembly, the valve core is arranged on the fixed guide 120. The material of the breathing valve housing 10 can be plastic or rubber. The use of plastic or rubber can reduce the overall weight of the breathing valve housing.

[0030] In this embodiment, the step-shaped body 110 includes a first step portion 111 and a second step portion 112, and the first step portion 111 and the second step portion 112 are both circular steps and are integrally formed. During assembly, the second step portion extends into the interior of the shell, and the first step portion covers the opening of the shell (forming a blockage). The second step portion 112 is fixed on the first step portion 111, and a channel 113 is opened in the middle of the first step portion 111 and the second step portion 112. It is easy to understand that the channel 113 is used for gas to pass through. There are a number of bosses 114 evenly distributed on the side wall of the second step portion 112, and the bosses 114 are used to support the nano metal filter. The number of the bosses 114 can be 4, 6, or 8. By setting the bosses, the nano metal filter can be supported and fixed, and the gaps between the bosses can be used for gas to pass through, reducing gas resistance. Among them, the bosses and the second step portion are integrally formed, and of course, they can also be a combination of separate bodies combined by welding connection.

[0031] In this embodiment, the fixed guide member 120 is a guide rod, one end of which is fixed inside the channel 113. Specifically, a cross-shaped base 115 can be provided inside the second step portion 112, and one end of the guide rod 120 is fixed to the middle part of the cross-shaped base. It is easy to understand that the position where the cross-shaped base contacts the second step portion is located below the boss. The cross-shaped base is integrally formed with the second step portion, and the cross-shaped base and the guide rod can be made of plastic to reduce weight.

[0032] The nano metal filter 21, the electronegative seal 22 and the conductive electrode 23 are circular in shape. The nano metal filter 21 has the same size as the electronegative seal 22. The specific size can be set according to actual needs and is not limited here. A circular hole is provided in the middle of the nano metal filter 21, the electronegative seal 22 and the conductive electrode 23. The nano metal filter 21, the electronegative seal 22 and the conductive electrode 23 are integrally sleeved on the guide rod through the circular hole. The nano metal filter 21 can be fixed in the second step hole by welding, sewing, hot pressing and the like. Among them, the nano metal filter 21 is placed on the side close to the wearer's face. The conductive electrode 23 is a metal film, such as a conductive film of copper, aluminum, tin, titanium oxide, etc., and is connected to an external circuit board (circuit board of the monitoring device) through a wire. The electronegative seal can be a silicone sheet. The silicone sheet can be pressed, can play a role in shock absorption and heat insulation, is not easy to crack after long-term use, and can extend the service life of the breathing valve.

[0033] In this embodiment, the surface of the electronegative sealing member is provided with an array microstructure, such as Figure 4 As shown, the array microstructure is a geometric array microstructure that produces a convex shape on the silicone sealing sheet through the method of reverse molding / 3D printing / laser processing. The geometric array includes but is not limited to a prism, a cone, a V-shape, etc. The silicone of this array microstructure can greatly increase the contact area with the nanometal mesh and improve the output efficiency of the electrical signal, thereby improving the overall performance of the breathing valve and reducing the monitoring error.

[0034] like Figure 4 As shown, in one implementation of this embodiment, the housing 12 includes an end cover 130 having an accommodating cavity, and the end cover is provided with a plurality of air permeable channels 131. The air permeable channels 131 allow external air to enter the interior of the breathing valve.

[0035] Exemplarily, the end cover 130 is cylindrical, and a fixing seat 132 adapted to the guide rod is provided on the top of the inner side of the end cover 130. The fixing seat can be a cap body whose end is fixed on the end cover. During assembly, the other end (movable end) of the guide rod is inserted into the cap body to fix the guide rod, thereby limiting the movement range of the silicone sheet to between the end cover and the nano-metal filter.

[0036] In order to make the connection between the end cover and the base more stable, a thread may be provided in the cap body, and a matching thread may be provided on the outer surface of the guide rod, so that the connection and fixation are performed through the thread.

[0037] As the wearer breathes and inhales, the silicone sheet separates from the nano-metal mesh, and the surfaces of the silicone sheet and the nano-metal mesh carry negative and positive charges generated by friction, respectively. During the periodic separation process, induced charges are generated in the external circuit, realizing the output of electrical signals. When exhaling, the silicone sheet moves outward and separates from the nano-metal mesh. Since the surface of the silicone sealing sheet carries negative charges, under the action of electrostatic induction, electrons move from the conductive electrodes on the outer surface of the sealing sheet to the nano-metal mesh and the potential of the metal mesh, thereby generating an induced electromotive force in the external circuit; when inhaling, the silicone sheet moves inward under the action of the guide column, achieving a sealing effect and preventing the entry of external pollutants. Based on the output electrical signal (such as a voltage signal of 0-3V), it can be used to monitor the use time of the breathing valve and the breathing status of the wearer.

[0038] In this embodiment, the breathing monitoring valve is used to monitor the gas movement state generated when a person speaks. A multifunctional, self-powered, highly sensitive, low-cost, and excellent protection and detection valve can be provided, which has important significance and practical value for promoting the development of smart wearable devices.

[0039] In this embodiment, the preparation process of the nano metal filter is as follows:

[0040] (1) Select a copper wire / nickel wire with a diameter of 50-200 μm (such as 150 μm), clean it with an alcohol solution in an ultrasonic wave for 10-20 minutes (such as 15 minutes) at room temperature, then place it in a sodium hydroxide solution (mass fraction 3%-8%) for cleaning for 10-15 minutes, then wash it with dilute sulfuric acid (mass fraction 3%-8%) for 10-20 seconds, and then wash it with deionized water. During the cleaning process, an inert gas (nitrogen, argon) is used to protect the drying. It should be noted that impurities attached to the surface of the metal mesh can be removed by ultrasonic cleaning, and impurities such as grease on the surface of the metal mesh can be removed by sodium hydroxide cleaning. The oxide layer on the surface of the metal mesh can be removed by cleaning with dilute sulfuric acid.

[0041] (2) Place the pretreated copper wire / nickel wire in an electroplating solution, electroplate a metal zinc layer / manganese layer on the surface of the copper wire / nickel wire, control the thickness of the metal layer to be 100-800 μm (such as 450 μm), and wash with deionized water. Use an inert gas (nitrogen, argon, etc.) to protect the drying. It should be noted that the cleaning solution on the surface of the metal mesh can be removed by washing with deionized water. It is easy to understand that by using an inert gas to protect the drying, the surface of the metal mesh can be prevented from being oxidized again. During the electroplating process, the metal mesh is connected to the cathode of a DC power supply, and the metal zinc is connected to the anode. Electroplating is carried out in a zinc electroplating solution, and the electroplating time, electroplating temperature and current density are controlled to make the surface of the metal mesh evenly covered with a zinc layer. The surface presents the color of metallic zinc.

[0042] (3) Placing the electroplated copper wire / nickel wire in a vacuum thermostat for alloying treatment at a temperature of 120°C-200°C for 1-3 hours. The temperature is raised to allow the metal mesh base metal and the zinc layer metal to diffuse with each other, thereby generating an alloy layer on the surface of the copper wire / nickel wire.

[0043] (4) The alloyed sample is placed in a sodium hydroxide solution (mass fraction 2%-10%) or a dilute sulfuric acid solution (mass fraction 2%-10%) for washing to remove the surface zinc / manganese elements. After washing with deionized water, it is dried under the protection of an inert gas (nitrogen, argon, etc.) to achieve the manufacture of the nanostructure on the surface of the metal wire. The nanostructure on the surface of the metal wire is as follows: Figure 5 As shown. Among them, due to the different active types of the base metal elements and the zinc layer elements, different selective corrosion phenomena will occur in the acid / alkaline solution. The acid / alkaline solution reacts with the zinc element first, and will react with the base element only after the zinc element is removed. By controlling the time / solution concentration / solution type of selective corrosion, the removal content of the zinc element can be controlled, and a nanostructure can be generated on the surface of the metal matrix. The surface appears black, indicating that there is a nanostructure on the surface of the metal matrix at this time. The alloying-dealloying treatment generates a nanostructure, the process is controllable, and the operation is simple.

[0044] (5) The prepared metal wire is woven to obtain a copper mesh / nickel mesh with a porosity of 10-300 ppi. Figure 6 The weaving process is a commonly used weaving technology in the prior art, and the specific operation steps are not limited here.

[0045] (6) Stacking the prepared multiple (such as two) nano-metal meshes in an offset manner and connecting them together by welding or hot pressing to obtain the multi-layer nano-metal mesh required for the breathing valve.

[0046] Based on the same inventive concept, an embodiment of the present invention further provides a protective mask, which includes the breathing valve described in the above embodiment. Since the breathing valve can know whether the nano metal filter needs to be replaced according to the monitoring device and can monitor the breathing process in real time, the protective mask can also remind the wearer to change the mask and monitor the wearer's breathing.

[0047] In summary, the present invention provides a breathing valve and a protective mask, wherein the breathing valve comprises: a breathing valve housing, including a base, and a shell detachably connected to the base; a valve core, wherein the valve core is fixed in the breathing valve housing, and comprises a nano-metal filter, a seal with electronegativity and a conductive electrode stacked on the surface of the nano-metal filter in sequence; the nano-metal filter is fixed on the base; and a monitoring device, wherein the monitoring device is electrically connected to the nano-metal filter and the conductive electrode, respectively. Wherein, an array microstructure is provided on the surface of the seal. As the wearer exhales and inhales, the seal with electronegativity and the nano-metal filter periodically rub to generate positive and negative charges, generate induced charges in an external circuit, and realize the output of an electrical signal. By monitoring the electrical signal, the accumulation of pollutants on the surface of the nano-metal filter can be determined, and the wearer can be reminded to replace the mask or breathing valve (nano-metal filter) in time. The breathing monitoring mask does not require an external power supply, can be self-driven and powered, and has the advantages of low cost, easy material acquisition, and simple manufacturing process.

[0048] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A breathing valve, characterized in that: include: A breathing valve housing, comprising a base and a shell detachably connected to the base; The valve core is fixed in the housing of the breathing valve, and comprises a nano metal filter, a sealing member and a conductive electrode which are sequentially stacked on the surface of the nano metal filter; the nano metal filter is fixed on the base; and the sealing member has electronegativity; as well as Monitoring equipment, the monitoring equipment is electrically connected to the nano metal filter and the conductive electrode respectively; The nano metal filter mesh and the negatively charged seal member are in periodic friction contact to generate an electrical signal, which is monitored by the monitoring device. As the pollutants are deposited on the nano metal filter mesh, the electrical signal monitored by the monitoring device will weaken. An electrical signal threshold is set. When the electrical signal monitored by the monitoring device is less than or equal to the electrical signal threshold, it indicates that the nano metal filter has reached the condition for replacement.

2. The breathing valve according to claim 1, characterized in that: The surface of the sealing member facing the nano metal filter is provided with an array microstructure.

3. The breathing valve according to claim 1, characterized in that: The base comprises: a stepped body and a fixed guide member fixed on the stepped body, and the valve core is arranged on the fixed guide member.

4. The breathing valve according to claim 3, characterized in that: The step-shaped body comprises: a first step portion and a second step portion, wherein the first step portion is fixedly connected to the second step portion, and a through passage is opened in the middle of the first step portion and the second step portion; and a plurality of bosses are fixed on the inner side wall of the second step portion.

5. The breathing valve according to claim 1, characterized in that: The nano metal filter screen comprises a plurality of staggered and stacked nano metal screens.

6. The breathing valve according to claim 5, characterized in that: The porosity of the nano metal mesh is 10-300 ppi.

7. The breathing valve according to claim 5, characterized in that: The metal mesh comprises: a plurality of metal wires, the diameter of the metal wires is 150-1000 μm; the metal wires comprise an alloy electroplating layer, the thickness of the alloy electroplating layer is 100-800 μm.

8. The breathing valve according to claim 2, characterized in that: The array microstructure is a geometric array microstructure, and the geometric body is selected from one or more of a pyramid, a cone, and a V-shape.

9. The breathing valve according to claim 1, characterized in that: The shell comprises an end cover with an accommodating cavity, and a plurality of air permeable channels are opened on the end cover.

10. A protective mask, characterized in that: Including the breathing valve described in any one of claims 1-9.

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