CN113521585A

CN113521585A - Current indicator

Info

Publication number: CN113521585A
Application number: CN202110606613.XA
Authority: CN
Inventors: 刘建文; 蒋友丁; 白桂豹; 赵增建
Original assignee: Beijing Jointech Electro Hydraulic Co ltd
Current assignee: Beijing Jointech Electro Hydraulic Co ltd
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2021-10-22

Abstract

The invention relates to a flow indicator, comprising: a valve body having first to fifth chambers; the first pressure regulating component is arranged in the fourth cavity; a second pressure regulating member disposed in the second chamber; a flow display component formed with a sixth cavity, at least a portion of the flow display component disposed in the fifth cavity, and the flow display component including an elastic tympanic membrane sealingly isolating the fifth cavity from the sixth cavity. The first chamber is configured to be connected with the airflow input pipe, and the second chamber is configured to be connected with the airflow output pipe; the first pressure regulating component closes the connection of the first cavity and the fourth cavity at the initial position until the air pressure of the first cavity exceeds a first threshold value, and the connection of the first cavity and the fourth cavity is allowed; the second pressure regulating component seals the connection between the second cavity and the fourth cavity at the initial position until the air pressure of the fourth cavity exceeds a second threshold value, and the second cavity is allowed to be connected with the fourth cavity; the second cavity is communicated with the sixth cavity through the first channel, and the fourth cavity is communicated with the fifth cavity through the second channel.

Description

Current indicator

Technical Field

The invention relates to a flow indicator, in particular to a gas flow display.

Background

The flow indicator is a general term for flow display, which is used to visually represent the pressure change of the fluid at the input and output ends, and also used to monitor the flow and the conduction state during the fluid transmission process. The gas flow display, especially the oxygen supply flow indicator used on the aviation oxygen mask, is one of the indispensable parts of the aviation oxygen mask, and the oxygen mask provides guarantee for the safety of aviation drivers and passengers.

CN211584746U discloses an oxygen supply flow indicator, comprising: the support body is internally provided with a piston guide channel, an oxygen inlet channel and an oxygen outlet channel. When this prior art's oxygen suppliment flow indicator oxygen suppliment, the telescopic pipe is gone into to the oxygen flow, comes displacement compression spring through green piston piece and red piston piece, shows the situation of green piston piece and red piston piece displacement simultaneously. Since the oxygen supply condition of the comparison file is displayed by the color mark when the piston block is displaced, not only is it difficult to observe an accurate numerical value, but also the observation in a weak light/backlight environment or a dark environment is not clear enough, and it is difficult for users with weak color or color blindness to distinguish the accurate numerical value. More importantly, the green piston block, the red piston block and the spring repeatedly move axially in the inner sleeve pipe, and the friction coefficient of the sleeve surface changes to a certain extent along with the prolonging of the service time, so that the display is not accurate and stable.

In addition, the current indicator in the prior art generally has the following technical defects: 1) the valve body is easy to deform and even crack at low temperature (especially below-20 ℃); 2) thicker valve body walls have to be used in order to withstand high pressures; 3) the material shrinkage is large, so that the product precision is low; 4) the materials are often not environmentally friendly and even contain components that are not beneficial to human health. In the manufacturing process, the prior art also has corresponding technical defects, such as: 1) because the inside of the flow indicator is provided with the inclined pore canal, the aperture is usually 1mm, and the requirement on a mold is higher; in order to control the precision, the tolerance of the product size needs to have extremely high requirements, but because some properties (such as large shrinkage rate) of the plastic per se cause that the precision control is difficult, so that the excellent process fit is difficult to obtain in the development of a flow indicator mould and the control of materials and sizes; 2) the development of a mould for processing the valve body is mainly controlled by a process route, and in the process of demoulding the product, a lot of products are generally discarded, so that the rejection rate is high, and the product cost is high. Whereas ordinary PET does not meet the product requirements, additives are often required to improve performance. Improvements in performance by different additives are often difficult to predict.

Therefore, there is a need in the art to develop a high quality flow indicator that is easy to manufacture, structurally stable and reliable, and capable of visually and accurately displaying the oxygen supply status.

Disclosure of Invention

Aiming at the defects of the prior art, the invention develops an oxygen supply flow indicator for an aviation oxygen mask.

The invention provides a flow indicator, which aims to at least solve one of the technical problems in the prior art.

Specifically, the technical scheme of the invention is a flow indicator, which comprises: the valve body is provided with a first cavity, a second cavity, a fourth cavity, a fifth cavity and an alternative third cavity; the first pressure regulating component is arranged in the fourth cavity; the second pressure regulating component is arranged in the second cavity; a flow display member defining a sixth chamber, at least a portion of the flow display member being disposed within the fifth chamber, and the flow display member including an elastic membrane sealingly isolating the fifth chamber from the sixth chamber; wherein: the first chamber is configured to be connected to a gas flow input pipe, and the second chamber is configured to be connected to a gas flow output pipe; the first pressure regulating component closes the connection of the first cavity and the fourth cavity at an initial position, and the connection of the first cavity and the fourth cavity is allowed until the air pressure of the first cavity exceeds a first threshold value; the second pressure regulating component seals the connection between the second cavity and the fourth cavity at an initial position until the air pressure of the fourth cavity exceeds a second threshold value, and the connection between the second cavity and the fourth cavity is allowed; the second cavity is communicated with the sixth cavity through a first channel, and the fourth cavity is communicated with the fifth cavity through a second channel.

Further, the fifth cavity is provided with an annular recess, the elastic tympanic membrane comprises a circular membrane part and an outer annular part arranged on the circumference of the membrane part, and the annular recess is used for hermetically accommodating the outer annular part; and said flow rate display means comprises: the transparent end cover is connected with the valve body in a sealing way, and the valve body is made of a PET material added with additives; a vent ring disposed between said end cap and said elastic tympanic membrane; a rubber pad disposed between said end cap and said vent ring; wherein the end cap compresses the rubber pad, the ventilation ring and the elastic tympanic membrane and allows a membrane part of the elastic tympanic membrane to perform deformation movement in the inner space of the ventilation ring; and wherein said first passageway is between said vent ring and said cushion at the interface of said sixth chamber.

Furthermore, the vent ring is provided with an outer convex part on the outer circumferential wall and a plurality of vent holes, and the vent holes penetrate through the outer circumferential wall except the outer convex part from the inner circumferential wall; the rubber pad comprises a plurality of divided flaps, and the flaps cover the inner circle of the ventilation ring.

Further, the first cavity comprises a first main cavity part and a first auxiliary cavity part which is communicated with the first main cavity part in a crossing way; the fourth cavity is provided with a bore taper part which is connected to the first auxiliary cavity part; the first pressure regulating member includes: the protective cap is fixedly connected with an opening of the fourth cavity of the valve body and is provided with a sliding hole; the valve rod is provided with a main rod part, and an end rod part and an end cone part which are positioned at two sides of the main rod part, wherein the end rod part is in linear sliding fit along the sliding hole of the protective cap, the main rod part is in linear sliding fit along the inner structure of the fourth cavity, the outer diameter of the end cone part is larger than that of the main rod part, and the outer diameter of the main rod part is larger than that of the end rod part; a first spring disposed about the primary stem, the first spring maintaining at least a compressed state between the cap and the end cone such that a thrust force generated by the first spring against the end cone is balanced with a pressure generated by the first threshold air pressure experienced by the end cone.

Furthermore, the taper of the end cone part is larger than or equal to that of the hole cone part; the interface of the second channel at the fourth cavity is communicated with the hole cone part.

Further, the protective cap is provided with a cap end part; a step part in the form of an oblique angle is arranged between the end rod part and the main rod part; the end cone part is provided with an end tip part, and the end tip part is in linear sliding fit with the first auxiliary cavity part.

Furthermore, the end part of the cap is provided with a tangent plane and an external thread; an opening of the fourth cavity is provided with an internal thread matched with the external thread; the first pressure regulating part also comprises a front sealing ring arranged between the outer wall of the protective cap and the inner wall of the fourth cavity; the first pressure regulating part further comprises a rear sealing ring arranged between the inner wall of the protective cap and the outer wall of the end rod part of the valve rod.

Further, a press block sealingly fixed in the positioning portion of the second chamber, the press block being provided with a plurality of through hole portions communicating with the fourth chamber; a pressing member provided on the pressing block, the pressing member covering the plurality of through-hole portions; the adjusting screw rod penetrates through the pressing piece and is in threaded connection with the pressing block; a second spring disposed between said adjusting screw and said pressing member; wherein said first passage is isolated from said compact by said compression element at said interface of said second chamber; and wherein said second spring maintains at least a compressed state between said adjustment screw and said follower such that a pushing force generated by said second spring against said follower is balanced with a pressure generated by said second threshold air pressure experienced by said follower.

Furthermore, the pressing block comprises a shaft body in threaded connection with the adjusting screw; the casting die comprises: a cylinder with a cylinder hole, wherein the cylinder hole is in sliding fit with the shaft body; a pad part covering the plurality of through hole parts; and the inner side wall of the annular convex part is matched with the outer ring part of one end of the second spring.

Further, the first main chamber portion of the first chamber has a first axis; the second chamber comprises a second main chamber portion having a second axis; said third chamber including a third main chamber portion having a third axis; said fourth chamber having a fourth axis; said fifth chamber having a fifth axis; said sixth chamber having a sixth axis; the first axis, the second axis, the third axis, the fifth axis and the sixth axis are all perpendicular to the fourth axis, and the fifth axis and the sixth axis are coincident; the valve body is integrally formed into the first channel and the second channel, the first channel is communicated from the second cavity to the sixth cavity in a bending mode, and the second channel is communicated from the fourth cavity to the fifth cavity in a straight line mode.

The invention has the beneficial effects that: the improved current indicator is easy to manufacture, low in rejection rate, reliable in structure, adjustable in pressure and enough, intuitive and accurate in displaying of the airflow conduction state.

Drawings

FIG. 1 is a perspective view of a flow detector according to an embodiment of the invention.

Figure 2 is a top view of a flow deflector according to an embodiment of the present invention.

FIG. 3 is an exploded view of the flow indicator according to an embodiment of the present invention, wherein the valve body is cut along section line A-A of FIG. 2.

FIG. 4 is a perspective cross-sectional view of a flow indicator according to an embodiment of the present invention, wherein the valve body is cut as per section line B-B of FIG. 2.

Figure 5 is a plan cross-sectional view, taken along section line B-B of figure 2, of an occluder in accordance with an embodiment of the present invention.

Fig. 6 is a partially enlarged view of the region C of fig. 5.

Figure 7 is a perspective cross-sectional view of a valve body of a flow indicator according to an embodiment of the present invention as indicated by section line B-B of figure 2.

Figure 8 is a perspective view of a valve body of a flow indicator according to an embodiment of the present invention from a bottom perspective.

Figure 9 is an external connection diagram of a flow detector according to an embodiment of the invention.

List of reference numerals

100 first pressure regulating member 200 second pressure regulating member 330 vent ring 426 first passage

110 cap 210 adjusting screw 331 external convex portion 430 third cavity

111 cap end 220 second spring 332 vent 431 third main chamber

112 section 230 compression element 340 elastic tympanic membrane 440 fourth cavity

113 external screw 231, column 341, and internal screw 441 in membrane portion

120 stem 232 pad 342 outer ring 442 bore taper

Second channel of sixth cavity 445 of annular protrusion 360 of 121-end rod 233

122 step 240 pressure block 400 valve body 450 fifth cavity

123 primary rod portion 241 shaft 410 first cavity 451 annular recess

124 end taper 242 through hole 411 first major chamber section 910 airflow inlet tube

125 tip 300 flow display 412 first sub-chamber portion 911 flow input connection

130 first spring 310 end cap 420 second chamber 920 air flow outlet tube

140 front seal ring 320 rubber cushion 421 second main chamber part 921 air flow output joint

150 back sealing ring 321 flap 422 positioning portion 931 stopper.

Detailed Description

The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, top, bottom, etc. used in the present invention are only relative to the positional relationship of the components of the present invention with respect to each other in the drawings. The mutual positional relationship can be illustrated with reference to the orientation shown in fig. 1.

Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.

Referring to fig. 1 through 4, in some embodiments, an flow indicator according to the present disclosure includes a first pressure regulating member 100, a second pressure regulating member 200, a display member, and a valve body 400. The valve body 400 has a first chamber 410, a second chamber 420, an (alternative) third chamber 430, a fourth chamber 440, a fifth chamber 450. First chamber 410 is configured to be connected to a gas flow input duct 910 and second chamber 420 is configured to be connected to a gas flow output duct 920.

The first pressure regulating member 100 is disposed in the fourth chamber 440. The second pressure regulating member 200 is disposed in the second chamber 420. At least a portion of the flow display assembly 300 is disposed in the fifth chamber 450. The flow display member 300 and the valve body 400 are combined to form a sixth chamber 360.

The flow display assembly 300 includes an elastic tympanic membrane 340, the elastic tympanic membrane 340 sealingly isolating the fifth chamber 450 from the sixth chamber 360. The first pressure regulating member 100 closes the connection of the first chamber 410 and the fourth chamber 440 in the initial position until the air pressure of the first chamber 410 exceeds a first threshold value to allow the connection of the first chamber 410 and the fourth chamber 440; the second pressure regulating member 200 closes the connection of the second chamber 420 and the fourth chamber 440 at the initial position until the air pressure of the fourth chamber 440 exceeds a second threshold value, and allows the connection of the second chamber 420 and the fourth chamber 440; the second chamber 420 and the sixth chamber 360 are communicated through a first passage 426, and the fourth chamber 440 and the fifth chamber 450 are communicated through a second passage 445.

According to the flow indicator of the present invention, the flow rate, the pressure change and the conduction of the gas fluid leaving the second chamber 420 after passing through the fourth chamber 440 from the first chamber 410 can be monitored by the tympanic membrane of the flow display part 300. The structure of the various components of the flow indicator and the manner in which they operate are described in various categories by way of example below.

Valve body

Referring to fig. 3 to 8, and preferably fig. 7 and 8, in some embodiments, the valve body 400, which is used as the flow indicator main body, may be made of PET material, and in addition, in order to meet performance requirements, additives may be added to the material, so as to meet the requirements of toughness, shrinkage, aging resistance, and the like. Preferably, the valve body 400 may be integrally formed with all of the chambers, passages and details thereof.

Referring to fig. 3-8, and preferably to fig. 4 and 5, in some embodiments, the first chamber 410 includes a first main chamber section 411 and a first sub-chamber section 412 in cross communication with the first main chamber section 411; the first main chamber section 411 of the first chamber 410 has a first axis; the second chamber 420 comprises a second main chamber portion 421 having a second axis; the third chamber 430 includes a third main chamber portion 431 having a third axis; fourth cavity 440 has a fourth axis; the fifth cavity 450 has a fifth axis; the sixth cavity 360 has a sixth axis. The first axis, the second axis, the third axis, the fifth axis and the sixth axis are all perpendicular to the fourth axis, and the fifth axis and the sixth axis are coincident. Also, the opening directions of the first chamber 410, the second chamber 420, and the third chamber 430 are the same, and the opening direction of the sixth chamber 360 is opposite thereto. Therefore, the flow indicator is compact and convenient to connect the airflow input and output pipe in the same direction, and the flow display part 300 can be observed in other directions.

Referring to fig. 7, in some embodiments, in the self structure of the valve body 400, the first chamber 410, the second chamber 420, and the third chamber 430 all communicate with the fourth chamber 440, the first sub-chamber portion 412 of the first chamber 410 communicates with the fourth chamber 440, and the axis of the first sub-chamber portion 412 coincides with the axis of the fourth chamber 440, wherein the fourth chamber 440 is provided with a bore taper 442, the bore taper 442 is connected to the first sub-chamber portion 412, and the bore taper 442 is close to a connection passage of the second chamber 420 with the fourth chamber 440 and serves as a face contact with the first pressure regulating member 100 in an opening and closing manner. The second chamber 420 is provided with a positioning part 422 for positioning and fixing the second pressure regulating member 200. An opening of the fourth cavity 440 is provided with an internal thread 441. The surface of the valve body 400 near the fifth chamber 450 may be provided with threaded holes for secure attachment to the flow display member 300 by screws or other fasteners. The fifth chamber 450 is provided with a stepped structure in the depth of the opening, in which a ring recess 451 is formed for receiving and fixing the edge of the elastic drum membrane 340 such that the elastic drum membrane 340 seals the fifth chamber 450 and the sixth chamber 360.

Referring to fig. 4, 7 and 8, the valve body 400 is also formed with a first passage 426 and a second passage 445. Wherein the first channel 426 is bent from the second cavity 420 to the sixth cavity 360 and the second channel 445 is straight from the fourth cavity 440 to the fifth cavity 450. Thus taking into account the compactness and the recent course of the through-hole.

First pressure regulating member

Referring to fig. 3-6, and preferably to fig. 5, in some embodiments, the first pressure regulating member 100 includes: a cap 110 fixedly coupled to an opening of the fourth chamber 440 of the valve body 400, the cap 110 having a slide hole; the valve rod 120 is provided with a main rod part 123, an end rod part 121 and an end conical part 124, wherein the end rod part 121 is linearly matched in a sliding mode along the sliding hole of the protective cap 110, the main rod part 123 is linearly matched in a sliding mode along the inner structure of the fourth cavity 440, the outer diameter of the end conical part 124 is larger than that of the main rod part 123, and the outer diameter of the main rod part 123 is larger than that of the end rod part 121; a first spring 130 disposed around the outer periphery of the primary stem 123, the first spring 130 maintaining at least a compressed state between the cap 110 and the end cone 124 such that a thrust force generated by the first spring 130 against the end cone 124 is balanced with a pressure generated by the first threshold air pressure to which the end cone 124 is subjected. The protective cap 110 is provided with a cap end 111; a step 122 in the form of an oblique angle is provided between the end rod part 121 and the main rod part 123; the end cone portion 124 is provided with an end tip portion 125, and the end tip portion 125 is linearly slidably engaged with the first sub-cavity portion 412.

Thus, by applying pneumatic pressure to the end taper 124 and the end tip 125 at the right end of the valve stem 120, the valve stem 120 is pushed to the left by the cracking pressure generated by the first threshold pneumatic pressure, and the gas enters the fourth chamber 440 through the first chamber 410. In addition, a pressure regulating ring with different thicknesses can be added between the protective cap 110 of the valve rod 120 and the first spring 130, so that different opening pressures can be regulated.

Referring to fig. 6, in a preferred embodiment, the taper of the end taper 124 is greater than or equal to the taper of the bore taper 442, and the interface of the second channel 445 at the fourth cavity 440 communicates with the bore taper 442. The nose cone 442 extends to a connection passage of the second chamber 420 and the fourth chamber 440. Therefore, it is possible to quickly let the air flow of the first chamber 410 enter the fourth chamber 440 and at the same time quickly circulate to the fifth chamber 450 through the second passage 445 after the end taper 124 and the end tip 125 are pushed away by the pressure formed in the first chamber 410.

Referring to fig. 3-5, in some embodiments, cap end 111 is provided with a cut 112 and external threads 113 for mating with internal threads 441 provided at the opening of fourth lumen 440; the first pressure regulating member 100 further includes a front packing 140 disposed between an outer wall of the cap 110 and an inner wall of the fourth chamber 440; the first pressure regulating member 100 further includes a rear packing 150 disposed between an inner wall of the cap 110 and an outer wall of the end stem portion 121 of the valve stem 120. Accordingly, the installation sealing between the first pressure regulating member 100 and the fourth chamber 440 can be ensured.

Second pressure regulating member

Referring to fig. 3-6, and preferably to fig. 3 and 6, in some embodiments, the second pressure regulating member 200 includes: a pressing piece 240 sealingly fixed in the positioning portion 422 of the second chamber 420, the pressing piece 240 being provided with a plurality of through-hole portions 242 communicating with the fourth chamber 440; a pressing member 230 provided on the pressing block 240, the pressing member 230 covering the plurality of through-hole portions 242; an adjusting screw 210 passing through the pressing member 230 and threadedly coupled to the pressing block 240; a second spring 220 disposed between the adjustment screw 210 and the pressing member 230; wherein the first passage 426 is isolated from the pressure block 240 at the interface of the second cavity 420 by the follower 230; and wherein the second spring 220 maintains at least a compressed state between the adjustment screw 210 and the follower 230 such that the urging force of the second spring 220 against the follower 230 is balanced with the pressure exerted by the second threshold air pressure experienced by the follower 230.

The first passage 426 is located above the pressing block 240 at the interface of the second chamber 420, and the pressing block 230 is forced by the second spring 220 to block the through hole portion 242 of the pressing block 240 by default. Therefore, when the gas pressure in the fourth chamber 440 reaches the second threshold gas pressure, the gas penetrates through the through hole 242 of the pressing block 240 to push the pressing member 230 covering the through hole 242 to move upward, and then the gas enters the second chamber 420 through the fourth chamber 440 and then enters the sixth chamber 360 through the first channel 426. In addition, different secondary opening pressures can be adjusted by rotating the adjusting screw 210 at the screwing depth of the pressing block 240.

With continued reference to FIG. 3, in the preferred embodiment, the pressure block 240 includes a shaft 241 that is threadably coupled to the adjustment screw 210. The pressing member 230 includes: a cylinder 231 having a cylinder hole which is slidably fitted with the shaft body 241; a pad portion 232 covering the plurality of through hole portions 242; and a ring protrusion 233 provided at the pad 232, an inner sidewall of the ring protrusion 233 being engaged with an outer ring portion of one end of the second spring 220. The second spring 220 is preferably a tower spring. Thus, the up-and-down movement of the pressing member 230 can be maintained without the spring being biased. Moreover, the structure is reliable and easy to install, replace and maintain.

Flow display component

Referring to fig. 3-6, and preferably to fig. 3 and 6, in some embodiments, the flow display assembly 300 includes: an elastic drum membrane 340, the elastic drum membrane 340 including a circular membrane portion 341 and an outer ring portion 342 provided on a circumference of the membrane portion 341, the ring recess 451 sealingly receiving the outer ring portion 342; a transparent end cap 310 hermetically connected with the valve body 400, wherein the valve body 400 is made of PET material added with additives; a vent ring 330 disposed between end cap 310 and elastic tympanic membrane 340; a rubber pad 320 disposed between the end cap 310 and the vent ring 330. The end cap 310 compresses the rubber mat 320, the vent ring 330 and the elastic tympanic membrane 340, and allows the membrane portion 341 of the elastic tympanic membrane 340 to perform a deformation motion in the inner space of the vent ring 330. The first passage 426 interfaces the sixth chamber 360 between the vent ring 330 and the cushion 320. The vent ring 330 has an outer protrusion 331 on an outer peripheral wall thereof and a plurality of vent holes 332, and the vent holes 332 penetrate the outer peripheral wall of the valve body 400 except the outer protrusion 331 from the inner peripheral wall thereof, thereby preventing the vent holes 332 from being blocked by the inner wall of the fifth chamber 450.

Therefore, when the air pressure reaches an opening pressure, the valve rod 120 is pushed to move left, and the air enters the fourth cavity 440 through the first cavity 410 and then communicates with the fifth cavity 450 through the second channel 445, so that the rubber drum is bulged downwards by the air pressure. When the air pressure reaches the second opening pressure, the pressing sheet is pushed to move upwards, and the air enters the second cavity 420 through the fourth cavity 440 and then is communicated with the sixth cavity 360 through the first channel 426, so that the rubber drum membrane is retracted upwards under the action of the air pressure.

Referring to fig. 3, preferably, the rubber eardrum may further have a specific color, so that the deformation amplitude of the rubber eardrum can be clearly seen through the high transparent end cap 310, thereby determining that the gas pressure value is within the set minimum and maximum values. In addition, the rubber pad 320 includes a plurality of divided flaps 321, and the plurality of flaps 321 cover the inner circle of the vent ring 330. The upward and downward separate oscillating movement of the flap 321 may also be triggered when there is a difference in air pressure between the fifth chamber 450 and the sixth chamber 360.

Referring to fig. 9, in an application scenario embodiment, the first chamber 410 and the second chamber 420 are provided with fastening holes to facilitate insertion of the airflow input connector 911 and the airflow output connector 921, respectively. The third chamber 430 is threaded for twisting in the plug 931. The third chamber 430 communicates with the fourth chamber 440 and may serve as a backup, for example, for servicing the first pressure regulating member 100. For daily use of the flow indicator, the third chamber 430 may be sealed with a plug 931. Preferably, the flow indicator is used for connecting an oxygen supply input and output pipeline of the oxygen mask.

The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present disclosure should be included in the scope of the present disclosure as long as the technical effects of the present invention are achieved by the same means. Are intended to fall within the scope of the present invention. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.

Claims

1. An flow indicator, comprising:

a valve body (400), said valve body (400) having a first chamber (410), a second chamber (420), a fourth chamber (440), a fifth chamber (450), and an alternative third chamber (430);

a first pressure regulating member (100) disposed in said fourth chamber (440);

a second pressure regulating member (200) disposed in the second chamber (420);

a flow display assembly (300) defining a sixth chamber (360), at least a portion of the flow display assembly (300) being disposed within the fifth chamber (450), and the flow display assembly (300) including an elastic membrane (340), the elastic membrane (340) sealingly isolating the fifth chamber (450) from the sixth chamber (360);

wherein:

said first chamber (410) being configured to be connected to a gas flow input duct (910), said second chamber (420) being configured to be connected to a gas flow output duct (920);

the first pressure regulating part (100) closes the connection of the first cavity (410) and the fourth cavity (440) at an initial position until the air pressure of the first cavity (410) exceeds a first threshold value, and the connection of the first cavity (410) and the fourth cavity (440) is allowed;

the second pressure regulating component (200) closes the connection between the second cavity (420) and the fourth cavity (440) at an initial position until the air pressure of the fourth cavity (440) exceeds a second threshold value, and the connection between the second cavity (420) and the fourth cavity (440) is allowed;

the second cavity (420) is communicated with the sixth cavity (360) through a first passage (426), and the fourth cavity (440) is communicated with the fifth cavity (450) through a second passage (445).

2. The flow indicator of claim 1, wherein:

the fifth cavity (450) is provided with an annular concave part (451), the elastic tympanic membrane (340) comprises a circular membrane part (341) and an outer annular part (342) arranged on the circumference of the membrane part (341), and the annular concave part (451) is used for hermetically accommodating the outer annular part (342); and is

The flow rate display part (300) comprises:

a transparent end cap (310) hermetically connected with the valve body (400), wherein the valve body (400) is made of a PET material added with additives;

a venting ring (330) disposed between said end cap (310) and said elastic tympanic membrane (340);

a rubber gasket (320) disposed between said end cap (310) and said vent ring (330);

wherein the end cap (310) compresses the rubber mat (320), the ventilation ring (330) and the elastic tympanic membrane (340) and allows a membrane portion (341) of the elastic tympanic membrane (340) to perform a deformation motion in an inner space of the ventilation ring (330);

and wherein said first channel (426) is between said vent ring (330) and said cushion (320) at the interface of said sixth chamber (360).

3. The flow indicator of claim 2, wherein:

the vent ring (330) is provided with an outer convex part (331) on the outer peripheral wall and a plurality of vent holes (332), and the vent holes (332) penetrate through the outer peripheral wall except the outer convex part (331) from the inner peripheral wall;

the rubber pad (320) comprises a plurality of divided flaps (321), and the flaps (321) cover the inner circle of the vent ring (330).

4. The flow indicator of claim 1, wherein:

the first chamber (410) includes a first main chamber section (411) and a first sub chamber section (412) which is in cross communication with the first main chamber section (411);

the fourth cavity (440) is provided with a bore taper part (442), and the bore taper part (442) is connected to the first auxiliary cavity part (412);

the first pressure regulating member (100) includes:

the protective cap (110) is fixedly connected with an opening of the fourth cavity (440) of the valve body (400), and the protective cap (110) is provided with a sliding hole;

the valve rod (120), the valve rod (120) has a main rod part (123), and an end rod part (121) and an end cone part (124) which are positioned at two sides of the main rod part (123), wherein the end rod part (121) is in linear sliding fit along the sliding hole of the protective cap (110), the main rod part (123) is in linear sliding fit along the internal structure of the fourth cavity (440), the outer diameter of the end cone part (124) is larger than that of the main rod part (123), and the outer diameter of the main rod part (123) is larger than that of the end rod part (121);

a first spring (130) disposed about the outer periphery of the main stem portion (123), the first spring (130) maintaining at least a compressed state between the cap (110) and the end cone portion (124) such that a thrust force generated by the first spring (130) against the end cone portion (124) is balanced with a pressure generated by the first threshold air pressure experienced by the end cone portion (124).

5. The flow indicator of claim 4, wherein:

the taper of the nose cone portion (124) is greater than or equal to the taper of the bore cone portion (442);

the interface of the second channel (445) at the fourth cavity (440) communicates with the bore taper (442).

6. The flow indicator of claim 4, wherein:

the protective cap (110) is provided with a cap end part (111);

a step part (122) in the form of an oblique angle is arranged between the end rod part (121) and the main rod part (123);

the end cone part (124) is provided with an end tip part (125), and the end tip part (125) is in linear sliding fit with the first auxiliary cavity part (412).

7. The flow indicator of claim 6, wherein:

the end part (111) of the cap is provided with a tangent plane (112) and an external thread (113);

an opening of the fourth cavity (440) is provided with an internal thread (441) matched with the external thread (113);

the first pressure regulating part (100) further comprises a front sealing ring (140) arranged between the outer wall of the protective cap (110) and the inner wall of the fourth cavity (440);

the first pressure regulating component (100) further comprises a rear sealing ring (150) arranged between the inner wall of the protective cap (110) and the outer wall of the end rod part (121) of the valve rod (120).

8. The current indicator of claim 1, wherein said second voltage regulating member (200) comprises:

a pressing block (240) hermetically fixed in the positioning portion (422) of the second chamber (420), the pressing block (240) being provided with a plurality of through hole portions (242) communicating with the fourth chamber (440);

a pressing member (230) provided on the pressing block (240), the pressing member (230) covering the plurality of through-hole portions (242);

an adjusting screw (210) which passes through the pressing piece (230) and is in threaded connection with the pressing block (240);

a second spring (220) disposed between said adjusting screw (210) and said pressing member (230);

wherein said first passage (426) is isolated from said compact (240) by said follower (230) at the interface of said second cavity (420);

and wherein said second spring (220) maintains at least a compressed state between said adjustment screw (210) and said follower (230) such that a thrust force generated by said second spring (220) against said follower (230) is balanced with a pressure force generated by said second threshold air pressure experienced by said follower (230).

9. The flow indicator of claim 8, wherein:

the pressing block (240) comprises a shaft body (241) in threaded connection with the adjusting screw rod (210);

the pressing member (230) comprises:

a post (231) having a post hole, said post hole being in sliding engagement with said shaft body (241);

a pad (232) covering the plurality of through-hole sections (242);

and a ring protrusion (233) provided at the pad (232), wherein an inner side wall of the ring protrusion (233) is engaged with an outer ring portion of one end of the second spring (220).

10. The flow indicator of any one of claims 1 to 9, wherein:

a first main chamber portion (411) of said first chamber (410) having a first axis;

said second chamber (420) comprising a second main chamber portion (421) having a second axis;

said third chamber (430) comprising a third main chamber portion (431) having a third axis;

said fourth cavity (440) having a fourth axis;

said fifth chamber (450) having a fifth axis;

said sixth cavity (360) having a sixth axis;

the first axis, the second axis, the third axis, the fifth axis and the sixth axis are all perpendicular to the fourth axis, and the fifth axis and the sixth axis are coincident;

the valve body is integrally formed with a first channel (426) and a second channel (445), the first channel (426) is connected from the second cavity (420) to the sixth cavity (360) in a bent manner, and the second channel (445) is connected from the fourth cavity (440) to the fifth cavity in a straight line.