Double-cavity current indicator

Abstract

The invention discloses a double-cavity current indicator which comprises a shell, a piston shaft assembly, a valve assembly, a display film and a shielding film. The shell is provided with a transparent cover and forms a display cavity, the display film is arranged in the display cavity and divides the display cavity into an outer cavity and an inner cavity, the inner cavity is located on the inner side of the display film, and the outer cavity is located on the outer side of the display film; the shielding film is located in the outer cavity and covers the outer side of the display film; the side, close to the air inlet cavity, of the piston cavity communicates with an inner cavity of the display film through a first air channel. The air outlet cavity communicates with the part, located on the outer side of the shielding film, in the outer cavity through a second air channel; the middle part of the shielding film is crossed and divided into a plurality of petal bodies; the display film is of a thin-wall cavity structure, the peripheral wall of the display film is composed of multiple layers of conical folding walls, and the display film is provided with a top wall. The liquid crystal display device has the advantages that the display film is sensitive to differential pressure and fast in response, and display is more obvious due to the design of the shielding film, the display film and the second air channel.

Description

Technical Field

[0001] This invention relates to the technical field of flow indicators, and in particular to a dual-cavity flow indicator. Background Technology

[0002] A dual-chamber flow indicator is a simple and intuitive visual indicator device installed on the oxygen supply line of passenger oxygen masks in civil aviation aircraft.

[0003] Patent document CN104645520B discloses a mask storage box with in-situ detection function. The flow indicator comprises a flow indicator housing, an isolation plate, a shaft, a plug, a retaining ring, a display cover, a pressure plate, a cavity sealing ring, a plug sealing ring, a housing sealing ring, a display diaphragm, a conical spring, a pressure spring, and mounting screws. In this flow indicator, the display diaphragm flashes based on the following principle: at the instant oxygen supply is connected, the oxygen pressure in the oxygen inlet line is consistent with the oxygen pressure below the display diaphragm through a small hole at the top of the flow indicator housing; while the oxygen pressure in the oxygen supply line is consistent with the pressure above the display diaphragm through a small hole on the side of the oxygen supply line in the flow indicator housing. Therefore, at the instant oxygen supply is connected or when the occupant breathes, a pressure difference is generated above and below the display diaphragm, causing the display diaphragm to bulge, indicating that oxygen supply is connected and oxygen is being supplied to the mask.

[0004] In this flow indicator, flash observation is achieved by displaying whether the diaphragm bulges or not. However, because the pressure change is small, the deformation of the diaphragm is also small, making it difficult to observe. Therefore, those skilled in the art continue to seek a flow indicator that can quickly identify pressure changes. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a flow indicator that can quickly identify pressure changes.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a dual-cavity flow indicator, comprising a housing, a piston shaft assembly, a valve assembly, a display film, and a shielding film;

[0007] The housing is provided with a transparent cover, and a display cavity is formed inside the transparent cover. The display film is disposed in the display cavity and divides it into an outer cavity and an inner cavity, wherein the inner cavity is located inside the display film and the outer cavity is located outside the display film; the shielding film is located inside the outer cavity and covers the outer side of the display film.

[0008] The housing has an air inlet chamber and an air outlet chamber that are arranged side by side and extend longitudinally. Above the air inlet chamber and the air outlet chamber, there is a piston chamber that extends laterally. The piston shaft assembly is assembled in the piston chamber, and the valve assembly is assembled in the air outlet chamber.

[0009] The piston chamber near the air inlet chamber is connected to the inner cavity of the display film via a first air passage; the air outlet chamber is connected to the portion of the outer cavity located outside the shielding film via a second air passage.

[0010] The display film includes a first conical portion and a second conical portion stacked vertically; the first conical portion is closed at the upper end and includes a first conical wall and an annular wall located at the lower outer edge and connected to the first conical wall; the second conical portion includes a second conical wall, the upper edge of the second conical wall being connected to the inner edge of the annular wall; cavities with open lower ends and communicating with each other are formed in the first and second conical portions; the thickness of the first conical wall is greater than the thickness of the second conical wall and the annular wall;

[0011] The shielding film is divided into multiple petals at the middle. The display film has a different color at least at its top surface from the top surface of the shielding film. When the air pressure in the inner cavity is greater than that in the outer cavity, the display film is stretched and squeezed against the shielding film, causing the multiple petals of the shielding film to deform and form an open slit, through which the top of the display film is exposed from the shielding film.

[0012] The technical solution of the present invention to solve the above-mentioned technical problem is as follows: the upper end of the first cone is provided with a horizontal dome wall, and the middle petal of the shielding film is larger than the radius of the dome wall.

[0013] A cylindrical portion is connected below the second cone portion, the cylindrical portion including a vertical cylindrical wall with the same diameter as and connected to the lower edge of the second cone wall.

[0014] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the housing includes a vertical part and a horizontal part; the vertical part includes a first vertical cylinder and a second vertical cylinder arranged side by side; the horizontal part includes a small-diameter pipe located above the first vertical cylinder, a large-diameter pipe located above the second vertical cylinder, and a base located above the small-diameter pipe and the large-diameter pipe; the display cavity is disposed in the base, and the transparent cover is fixed above the base;

[0015] The air inlet chamber is located inside the first vertical cylinder, the air outlet chamber is located inside the second vertical cylinder, and the inner and outer diameters of the small-diameter pipe are both smaller than those of the large-diameter pipe.

[0016] The piston shaft assembly includes a piston rod and a spring, with the piston head of the piston rod located inside the small-diameter tube and the rod portion of the piston rod located inside the large-diameter tube.

[0017] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the upper end of the first vertical cylinder and the air inlet chamber therein gradually decreases in diameter from bottom to top and is connected to the small diameter pipe, thereby forming a recessed part in the upper section of the first vertical cylinder and both sides of the small diameter pipe.

[0018] The recessed portion is provided with an inclined tube extending obliquely upward from the side of the second vertical cylinder toward the first vertical cylinder to the base. The inclined tube is provided with a first inclined air passage, and the base is provided with a second inclined air passage that is obliquely upward in the opposite direction. The first inclined air passage and the second inclined air passage constitute the second air passage.

[0019] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: a dual-cavity flow indicator, comprising a housing, a piston shaft assembly, a valve assembly, a display film, and a shielding film;

[0020] The housing is provided with a transparent cover, and a display cavity is formed inside the transparent cover. The display film is disposed in the display cavity and divides it into an outer cavity and an inner cavity, wherein the inner cavity is located inside the display film and the outer cavity is located outside the display film; the shielding film is located inside the outer cavity and covers the outer side of the display film.

[0021] The housing has an air inlet chamber and an air outlet chamber that are arranged side by side and extend longitudinally. Above the air inlet chamber and the air outlet chamber, there is a piston chamber that extends laterally. The piston shaft assembly is assembled in the piston chamber, and the valve assembly is assembled in the air outlet chamber.

[0022] The piston chamber near the air inlet chamber is connected to the inner cavity of the display film via a first air passage; the air outlet chamber is connected to the portion of the outer cavity located outside the shielding film via a second air passage.

[0023] The shielding film is divided into multiple petals through cross-segmentation in the middle; the display film has a thin-walled cavity structure, its peripheral wall is composed of multiple layers of conical folded walls, and it has a top wall; at least the upper surface of the top wall of the display film is a different color from the upper surface of the shielding film.

[0024] When the internal air pressure is greater than the external air pressure, the conical folded wall of the display film is stretched, the top wall deforms and squeezes the shielding film, causing multiple petals of the shielding film to deform and form an open slit, through which the top wall of the display film is exposed from the shielding film.

[0025] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the display film includes a first cone portion and a second cone portion stacked on top of each other; the upper end of the first cone portion is closed, including a first conical wall and an annular wall located at the lower outer edge and connected to the first conical wall; the second cone portion includes a second conical wall, and the upper edge of the second conical wall is connected to the inner edge of the annular wall; cavities with open lower ends and communicating with each other are formed in the first cone portion and the second cone portion.

[0026] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: the upper end of the first cone is provided with a horizontal dome wall, the thickness of the first cone wall and the dome wall is greater than the thickness of the second cone wall and the annular wall; the angle between the generatrix of the first cone wall and the axis is greater than the angle between the generatrix of the second cone wall and the axis.

[0027] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: the first conical wall and the dome wall are of equal thickness; the second conical wall and the annular wall are of equal thickness; the thickness of the first conical wall and the dome wall is more than twice the thickness of the second conical wall and the annular wall.

[0028] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the thickness of the first conical wall and the dome wall is 0.45-0.6 mm, and the thickness of the second conical wall and the annular wall is 0.15-0.25 mm; the maximum diameter of the second cone is 1.2 to 1.5 times the maximum diameter of the first cone; the angle between the generatrix of the first conical wall and the axis is 30°-45°, and the angle between the generatrix of the second conical wall and the axis is 9°-15°.

[0029] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the housing includes a vertical part and a horizontal part; the vertical part includes a first vertical cylinder and a second vertical cylinder arranged side by side; the horizontal part includes a small-diameter pipe located above the first vertical cylinder, a large-diameter pipe located above the second vertical cylinder, and a base located above the small-diameter pipe and the large-diameter pipe; the display cavity is disposed in the base, and the transparent cover is fixed above the base;

[0030] The air inlet chamber is located inside the first vertical cylinder, the air outlet chamber is located inside the second vertical cylinder, and the inner and outer diameters of the small-diameter pipe are both smaller than those of the large-diameter pipe.

[0031] The piston shaft assembly includes a piston rod and a spring, wherein the piston head of the piston rod is located inside the small-diameter tube, and the rod portion of the piston rod is located inside the large-diameter tube;

[0032] The upper end of the first vertical cylinder gradually narrows in diameter from bottom to top and connects to the small-diameter pipe, thereby forming a recessed portion in the upper section of the first vertical cylinder and on both sides of the small-diameter pipe.

[0033] The recessed portion is provided with an inclined tube extending obliquely upward from the side of the second vertical cylinder toward the first vertical cylinder to the base. The inclined tube is provided with a first inclined air passage, and the base is provided with a second inclined air passage that is obliquely upward in the opposite direction. The first inclined air passage and the second inclined air passage constitute the second air passage.

[0034] Compared with the prior art, the advantages of the present invention are: First, the expansion of the display film pushes the shielding film to unfold outward, the conical folded wall is stretched, the top wall deforms and squeezes the shielding film, causing the multi-lobes of the shielding film to fold outward and the slits to open, and the top wall of the display film is exposed from the shielding film. Since the top wall and the shielding film are different colors, a clear visual contrast is formed.

[0035] Second, the air outlet chamber is connected to the outer cavity located outside the shielding film via a second air passage. Therefore, pressure changes can be applied to the display film more effectively, avoiding response delays caused by the shielding film's adhesion to the display film preventing pressure changes from being applied to the display film in a timely manner.

[0036] Third, the display film consists of a thin-walled cavity structure formed by multiple layers of conical folded walls, with the first and second conical walls flexibly hinged by an annular wall. When airflow enters the inner cavity of the display film from bottom to top, the folded walls are axially pulled apart, directly converting the radial displacement of the first cone into the axial displacement of the second cone. Due to the double-layer stacking, the deformation leverage ratio is greater than that of a single-layer film that can only achieve surface bulging through its own deformation. Therefore, it can be pushed out of the viewing window in a very short time, thus achieving fast response and high resilience. Attached Figure Description

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0038] Figure 1 This is a perspective view of a dual-cavity flow indicator in a preferred embodiment;

[0039] Figure 2 This is a front view of a dual-cavity flow indicator in a preferred embodiment;

[0040] Figure 3 This is a top view of a dual-cavity flow indicator in a preferred embodiment;

[0041] Figure 4 A dual-cavity flow indicator in a preferred embodiment Figure 3 Sectional view at point AA;

[0042] Figure 5 A dual-cavity flow indicator in a preferred embodiment Figure 3 Sectional view at point BB;

[0043] Figure 6 A dual-cavity flow indicator in a preferred embodiment Figure 3A partial sectional view at point CC;

[0044] Figure 7 An exploded view of a preferred embodiment of a dual-cavity flow indicator;

[0045] Figure 8 This is a three-dimensional schematic diagram of the display membrane in a dual-cavity flowmeter according to a preferred embodiment;

[0046] Figure 9 This is a cross-sectional view of the display membrane in a dual-cavity flowmeter according to a preferred embodiment;

[0047] Figure 10 This is a schematic diagram showing the interaction between the display membrane and the shielding membrane during reset in a preferred embodiment of a dual-cavity flowmeter.

[0048] Figure 11 This is a schematic diagram of the display membrane and the shielding membrane working together in a dual-cavity flowmeter according to a preferred embodiment.

[0049] Figure label:

[0050] 1. Housing; 2. Piston shaft assembly; 3. Valve assembly; 4. Display film; 5. Shielding film; 6. Transparent cover; 7. Display cavity; 71. Outer cavity; 72. Inlet cavity; 8. Outlet cavity; 9. Piston cavity; 10. First air passage; 28. Second air passage; 11. First inclined air passage; 111. Second inclined air passage; 112. Valve body; 12. Piston rod; 13. Piston head; 130. Thin rod section; 131. Spring; 14. First cone portion; 151. First conical wall; 152. Annular wall; 153. Dome wall; Second conical portion 16; Second conical wall 161; Cylindrical portion 25; Vertical cylindrical wall 251; Vertical portion 17; First vertical cylinder 171; Second vertical cylinder 172; Horizontal portion 18; Small diameter pipe 181; Large diameter pipe 182; Base 183; Adjustment knob 19; Recessed portion 20; Inclined pipe 21; Large diameter cylindrical section 22; Gradually tapered section 23; Small diameter cylindrical section 24; Mounting lug 30; Fixing hole 31; Protruding post 32; First sealing ring 26; Second sealing ring 27. Detailed Implementation

[0051] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0052] It should be noted that similar labels in the accompanying drawings on the lower wall indicate similar items. Therefore, once an item is defined in one drawing, it will not be further defined or explained in subsequent drawings.

[0053] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] like Figure 7 As shown, this embodiment provides a dual-cavity flow indicator, including a housing 1, a piston shaft assembly 2, a valve assembly 3, a display film 4, and a shielding film 5.

[0055] like Figure 1 , 4 As shown, a transparent cover 6 is provided on the housing 1, and a display cavity 7 is provided inside the transparent cover 6. A display film 4 is provided inside the display cavity 7, and the display film 4 isolates the display cavity 7 into an outer cavity 71 and an inner cavity 72. The cavity of the display film 4 is connected to the inner cavity. A shielding film 5 is located in the outer cavity 71 and is placed outside the display film 4.

[0056] like Figure 4-5 As shown, the housing 1 has longitudinally extending air inlet chamber 8 and air outlet chamber 9 arranged side by side, and a transverse piston chamber 10 is provided above the air inlet chamber 8 and air outlet chamber 9. The piston shaft assembly 2 is located in the piston chamber 10. The valve assembly 3 is located in the air outlet chamber 9.

[0057] like Figure 6 As shown, the piston chamber 10, near the intake chamber 8, is connected to the inner cavity 72 via the first air passage 28. Figure 5 As shown, the air outlet 9 is partially connected to the outer cavity 71 located outside the shielding membrane 5 through the second air passage 11.

[0058] like Figure 7 , 10 As shown in Figure 11, the shielding membrane 5 is cross-divided in the middle to form multiple lobes 12. Figure 8-9 As shown, the display film 4 has a thin-walled cavity structure, including a top wall and a peripheral wall formed by multiple layers of conical folded walls. The upper surface of the top wall of the display film 4 is at least a different color from the upper surface of the shielding film 5. The top wall is the top of the display film, and it is not necessarily on a different surface from the peripheral wall connected to it; for example, the two can be a smoothly transitioning curved surface.

[0059] like Figure 1-7As shown, the lower end of the intake chamber 8 is provided with an interface and a first sealing ring 26, and the intake chamber 8 is connected to an intake pipe. The lower end of the exhaust chamber 9 is provided with an interface and a second sealing ring 27, and the exhaust chamber 9 is connected to an exhaust pipe. When the piston shaft assembly 2 is in the initial position, the piston head 130 of the piston shaft assembly 2 blocks the piston chamber 10, dividing the piston chamber 10 into a part communicating with the intake chamber 8 and a part communicating with the exhaust chamber 9. The intake chamber 8 and the exhaust chamber 9 are not connected, and the first air passage 28 is blocked by the piston head 130, so the intake chamber 8 and the inner cavity 72 are not connected.

[0060] When the pressure of the introduced oxygen exceeds the pressure of the spring 14 of the piston shaft assembly 2, the piston shaft assembly 2 moves towards the outlet chamber 9, and the piston head 130 releases the blockage of the first air passage 28. Gas begins to flow from the inlet chamber 8 into the inner chamber 72 through the first air passage 28. At this time, the air pressure in the inner chamber 72 increases, exceeding the air pressure in the outer chamber 71, causing the display film 4 to expand towards the outer chamber 71. The expansion of the display film 4 pushes the shielding film 5 outward, stretching the conical folded wall. The top wall deforms and compresses the shielding film 5, causing the multi-lobed body 12 of the shielding film 5 to fold outward and the slit to open. The top wall of the display film 4 is exposed from the shielding film 5, as shown in the image. Figure 11 As shown, the top wall and the shielding membrane 5 are different colors, thus creating a clear visual contrast, indicating that the oxygen level meets the standard.

[0061] As oxygen supply continues, the piston shaft assembly 2 moves further outward, and the piston head 130 releases the blockage on the outlet chamber 9. Air pressure acts on the valve assembly 3 and pushes it open, allowing airflow to exit the outlet chamber 9 and enter the outlet pipe for use. At this time, the air pressure in the outlet chamber 9 is balanced with the air pressure in the inlet chamber 8. The airflow in the outlet chamber 9 enters the outer cavity 71 through the second air passage 11. The display membrane 4, which was previously deformed by the pressure difference, returns to its original shape and collapses downward due to the disappearance of the pressure difference. The force acting on the shielding membrane 5 disappears, the shielding membrane 5 returns to its original shape, and the valve 12 closes. Figure 10 As shown, the display film 4 cannot be seen through the transparent cover 6.

[0062] When the flow meter is used with an oxygen mask, the outlet tube connects to the mask. Due to the user's breathing, the air pressure in the outlet chamber 9 changes instantaneously. This instantaneous change affects the pressure difference between the inner chamber 72 and the outer chamber 71. Specifically, when the user inhales, the pressure in the outlet chamber 9 decreases, causing the pressure in the outer chamber 71 to be lower than that in the inner chamber 72. At this moment, the expansion of the display membrane 4 pushes the shielding membrane 5 outward, making it visible. Conversely, when the user exhales, the pressure in the outlet chamber 9 increases, the pressure difference disappears or reverses, and the display membrane 4 and the shielding membrane 5 return to their original state. The display membrane 4 is then covered and obscured by the shielding membrane 5, making it invisible. This allows for a clearer and more precise observation of the changes.

[0063] Because the display film 4 has a thin-walled cavity structure composed of multiple layers of conical folded walls, it has a stronger axial pressure response capability. The air outlet 9 is partially connected to the outer cavity 71 located outside the shielding film 5 through the second air passage 11. Therefore, air pressure changes can be applied to the display film 4 more effectively, avoiding the response delay caused by the shielding and adhesion effect of the shielding film 5 on the display film 4, which prevents air pressure changes from being applied to the display film 4 in a timely manner.

[0064] like Figure 8-9 As shown, the display film 4 is integrally molded from rubber and includes a first conical portion 15 and a second conical portion 16 stacked vertically. The upper end of the first conical portion 15 is closed and includes a first conical wall 151 and an annular wall 152 located at the lower outer edge and connected to the first conical wall 151. The second conical portion 16 includes a second conical wall 161, the upper edge of which is connected to the inner edge of the annular wall 152. Cavities with open lower ends and communicating with each other are formed in the first conical portion 15 and the second conical portion 16.

[0065] In this embodiment, the first conical wall 151 and the second conical wall 161 are flexibly hinged by the annular wall 152. When the airflow enters the inner cavity 72 of the display film 4 from bottom to top, the folded wall is axially pulled open, directly converting the radial displacement of the first cone 15 into the axial displacement of the second cone 16. Due to the double-layer stacking, the deformation leverage ratio is greater than that of a single-layer film that can only achieve surface bulging through its own deformation, so it can be pushed out of the viewing window in a very short time, thus achieving fast response and high resilience.

[0066] Preferably, such as Figure 8 As shown, the thickness of the first conical wall 151 is greater than that of the second conical wall 161 and the annular wall 152. The first conical portion 15 forms a high-rigidity upper arched shell, and the second conical portion 16 forms a low-rigidity lower arched shell. In the low-pressure stage, pressure acts on the second conical portion 16, and the extremely thin wall first produces a large deflection, instantly releasing the pre-flattened state. In the high-pressure stage: the second conical portion 16 continues to deform and pulls the annular surface, causing the first conical portion 15 to continue to stretch and bulge. That is to say, because the second conical wall 161 and the annular wall 152 are thin, the deformation response is fast.

[0067] like Figure 1-3 As shown, the housing 1 includes a vertical portion 17 and a horizontal portion 18. The vertical portion 17 includes a first vertical cylinder 171 and a second vertical cylinder 172 arranged side by side. The horizontal portion 18 includes a small-diameter pipe 181 located above the first vertical cylinder 171, a large-diameter pipe 182 located above the second vertical cylinder 172, and a base 183 located above the small-diameter pipe 181 and the large-diameter pipe 182. The display cavity 7 is disposed within the base 183, and the transparent cover 6 is fixed above the base 183. The air inlet cavity 8 is located within the first vertical cylinder 171, and the air outlet cavity 9 is located within the second vertical cylinder 172. The inner and outer diameters of the small-diameter pipe 181 are both smaller than those of the large-diameter pipe 182.

[0068] like Figure 1-4 As shown in Figure 7, the piston shaft assembly 2 includes a piston rod 13 and a spring 14. The piston head 130 of the piston rod 13 is fitted into the small-diameter pipe 181, while the rod portion of the piston rod 13 extends into the large-diameter pipe 182. The reciprocating motion of the piston is achieved by the elastic force of the spring 14 in response to changes in airflow pressure. An adjustment knob 19 is located at the end of the large-diameter pipe 182. The end of the piston rod 13 includes a thin rod section 131 that passes through the adjustment knob 19. The adjustment knob 19 abuts against the spring 14. The piston shaft assembly 2 can be installed inside the housing 1 by adjusting the adjustment knob 19, and the compression of the spring 14 can also be adjusted. The piston shaft assembly 2, by adjusting the compression of the spring 14, can control the airflow display threshold.

[0069] like Figure 1-2 As shown, the upper end of the first vertical cylinder 171 and its internal air intake chamber 8 gradually decreases in diameter from bottom to top and connects to the small-diameter pipe 181, thereby forming a recess 20 in the upper section of the first vertical cylinder 171 and on both sides of the small-diameter pipe 181 in the housing 1. The recess 20 is provided with an inclined pipe 21 that extends obliquely upward from the side of the second vertical cylinder 172 toward the first vertical cylinder 171 to the base 183.

[0070] like Figure 5 As shown, the inclined tube 21 has a first inclined air passage 111, and the base 183 has a second inclined air passage 112 that is inclined upwards in the opposite direction. The first inclined air passage 111 and the second inclined air passage 112 constitute the second air passage 11. The upper end of the outer shell of the first vertical cylinder 171 adopts a variable diameter design that gradually decreases in diameter from bottom to top to match the shape of the inner cavity 72, and smoothly connects to the small diameter tube 181 above through this variable diameter section. This design, without reducing the effective volume of the air inlet cavity 8, naturally forms a recessed space on both sides of the small diameter tube 181, and the inclined tube 21 can be directly embedded in the recessed part 20. There is no need to add an additional protruding structure or extension pipe outside the shell 1, which greatly reduces the overall size of the equipment, and is especially suitable for scenarios with limited installation space.

[0071] Preferably, such as Figure 1-4 As shown, the air intake chamber 8 inside the first vertical cylinder 171 includes a large-diameter cylindrical section 22, a tapered section 23, and a small-diameter cylindrical section 24. The inner diameter of the small-diameter cylindrical section 24 is the same as the inner diameter of the piston chamber 10 inside the small-diameter pipe 181. The tapered section 23 and the small-diameter cylindrical section 24 can stabilize and rectify the airflow rising in the air intake chamber 8, preventing vortices from being generated during the airflow from the air intake chamber 8 to the piston chamber 10, thus avoiding affecting the airflow transmission.

[0072] In addition, the combination of the recess 20 and the inclined tube 21 is not a simple space filling. The two ends of the inclined tube 21 are rigidly connected to the side of the second vertical cylinder 172 and the bottom of the base 183, respectively. This is equivalent to adding "reinforcing ribs" to the weak areas of the shell 1, which can disperse the stress concentration of the shell 1 under fluid pressure and avoid cracking or deformation after long-term use.

[0073] It should be understood that, as Figure 5 As shown, the first inclined airway 111 slopes upward from the side of the second vertical cylinder 172, and the second inclined airway 112 slopes upward in the opposite direction within the base 183. The two airways form a continuous curved path that slopes upward first and then turns upward in the opposite direction. The airflow contains minute impurities and moisture, which can easily enter the display cavity 7 in conventional horizontal or downward-sloping airways. When moisture and impurities enter the display cavity 7, they not only affect the field of view within the display cavity 7, but also easily damage the membrane properties of the display film 4 and the shielding film 5, thus affecting the response capability. The reverse upward slope design of the second airway 11 allows it to return downward to the outlet cavity 9 due to gravity, thus avoiding contamination of the display cavity 7 and damage to the membrane, reducing the adhesion of impurities to the inner wall of the airway, and preventing the airflow from directly blowing onto the display film 4, thereby improving the accuracy of the sensing air pressure.

[0074] like Figure 1-2 As shown, the entire housing is integrally formed. The lower section of the large-diameter tube 182 is provided with mounting lugs 30 for mounting a flow indicator. The mounting lugs are provided with protruding posts 32, and the protruding posts 32 are provided with fixing holes 31.

[0075] like Figure 8-9 As shown, the upper end of the first conical portion 15 of the display film 4 is provided with a horizontal dome wall 153, and a cylindrical portion 25 is connected to the lower part of the second conical portion 16. The cylindrical portion 25 includes a vertical cylindrical wall 251 with the same diameter as the lower edge of the second conical wall 161 and connected to it. Under the action of the lower side and the stretching action of the first conical wall 151, the horizontal dome wall 153 can bulge slightly upward, further increasing the axial deformation stroke and making the pressure display effect better. In addition, the horizontal dome wall 153 can also increase the display area and improve the display visual effect.

[0076] Preferably, the upper surface of the dome wall 153 is coated with a highly recognizable color coating, such as a light color, while the upper surface of the shielding film 5 is dark, thereby improving the display effect. More preferably, the upper surface of the dome wall 153 is smooth while the lower surface of the shielding film 5 has an uneven structure to prevent the two from sticking together after being squeezed.

[0077] like Figure 9As shown, preferably, the first conical wall 151 and the dome wall 153 are of equal thickness. The second conical wall 161 and the annular wall 152 are of equal thickness. The thickness of the first conical wall 151 and the dome wall 153 is more than twice the thickness of the second conical wall 161 and the annular wall 152, thereby making the rigidity gradient relationship of the two membrane structures more obvious and further improving the pressure difference response performance of the membrane. Preferably, the thickness of the first conical wall 151 and the dome wall 153 is 0.45-0.6 mm, and the thickness of the second conical wall 161 and the annular wall 152 is 0.15-0.25 mm.

[0078] like Figure 9 As shown, the diameter of the inner hole of the annular wall 152 is larger than the diameter of the dome wall 153. This ensures smooth airflow into the first cone 15 while also ensuring that the airflow is directed towards the dome wall 153, which is beneficial for the rapid response of the diaphragm.

[0079] Furthermore, such as Figure 8-9 As shown, the slope of the first conical wall 151 is greater than that of the second conical wall 161. The larger slope of the first conical portion 15 results in higher circumferential tension and thus higher geometric stiffness. The smaller slope of the second conical portion 16 results in lower circumferential tension and thus lower geometric stiffness. This further enhances the stiffness difference between the two folded walls, causing the second conical portion 16 to deform first during the low-pressure stage, thus amplifying its stroke. Preferably, the angle between the generatrix of the first conical wall 15111 and the axis is 30°–45°, the angle between the generatrix of the second conical wall 16121 and the axis is 9°–15°, and the maximum diameter of the second conical portion 16 is 1.2 to 1.5 times the maximum diameter of the first conical portion 15.

[0080] This invention provides a dual-cavity flow indicator. Specific examples are used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A dual-cavity current indicator, characterized in that: Includes housing, piston shaft assembly, valve assembly, display film, and shielding film; The housing is provided with a transparent cover, and a display cavity is formed inside the transparent cover. The display film is disposed in the display cavity and divides it into an outer cavity and an inner cavity, wherein the inner cavity is located inside the display film and the outer cavity is located outside the display film; the shielding film is located inside the outer cavity and covers the outer side of the display film. The housing has an air inlet chamber and an air outlet chamber that are arranged side by side and extend longitudinally. Above the air inlet chamber and the air outlet chamber, there is a piston chamber that extends laterally. The piston shaft assembly is assembled in the piston chamber, and the valve assembly is assembled in the air outlet chamber. The piston chamber near the air inlet chamber is connected to the inner cavity of the display film via a first air passage; the air outlet chamber is connected to the portion of the outer cavity located outside the shielding film via a second air passage. The display film includes a first conical portion and a second conical portion stacked vertically; the first conical portion is closed at the upper end and includes a first conical wall and an annular wall located at the lower outer edge and connected to the first conical wall; the second conical portion includes a second conical wall, the upper edge of the second conical wall being connected to the inner edge of the annular wall; cavities with open lower ends and communicating with each other are formed in the first and second conical portions; the thickness of the first conical wall is greater than the thickness of the second conical wall and the annular wall; The shielding film is divided into multiple lobes by cross-splitting in the middle; the display film has a different color at least on its top surface than the top surface of the shielding film. When the internal air pressure is greater than the external air pressure, the display film is stretched and squeezed against the shielding film, causing multiple petals of the shielding film to deform and form an open slit, through which the top of the display film is exposed from the shielding film.

2. A dual-cavity flow indicator according to claim 2, characterized in that: The upper end of the first cone is provided with a horizontal dome wall, and the middle petal of the shielding membrane is larger than the radius of the dome wall. A cylindrical portion is connected below the second cone portion, the cylindrical portion including a vertical cylindrical wall with the same diameter as and connected to the lower edge of the second cone wall.

3. A dual-cavity flow indicator according to claim 1, characterized in that: The housing includes a vertical portion and a horizontal portion; the vertical portion includes a first vertical cylinder and a second vertical cylinder arranged side by side; the horizontal portion includes a small-diameter pipe located above the first vertical cylinder, a large-diameter pipe located above the second vertical cylinder, and a base located above the small-diameter pipe and the large-diameter pipe; the display cavity is disposed within the base, and the transparent cover is fixed above the base; The air inlet chamber is located inside the first vertical cylinder, the air outlet chamber is located inside the second vertical cylinder, and the inner and outer diameters of the small-diameter pipe are both smaller than those of the large-diameter pipe. The piston shaft assembly includes a piston rod and a spring, with the piston head of the piston rod located inside the small-diameter tube and the rod portion of the piston rod located inside the large-diameter tube.

4. A dual-cavity flow indicator according to claim 1, characterized in that: The upper end of the first vertical cylinder and its internal air inlet chamber gradually decreases in diameter from bottom to top and connects to the small-diameter pipe, thereby forming a recessed portion in the upper section of the first vertical cylinder and both sides of the small-diameter pipe. The recessed portion is provided with an inclined tube extending obliquely upward from the side of the second vertical cylinder toward the first vertical cylinder to the base. The inclined tube is provided with a first inclined air passage, and the base is provided with a second inclined air passage that is obliquely upward in the opposite direction. The first inclined air passage and the second inclined air passage constitute the second air passage.

5. A dual-cavity flow indicator, characterized in that: Includes housing, piston shaft assembly, valve assembly, display film, and shielding film; The housing is provided with a transparent cover, and a display cavity is formed inside the transparent cover. The display film is disposed in the display cavity and divides it into an outer cavity and an inner cavity, wherein the inner cavity is located inside the display film and the outer cavity is located outside the display film; the shielding film is located inside the outer cavity and covers the outer side of the display film. The housing has an air inlet chamber and an air outlet chamber that are arranged side by side and extend longitudinally. Above the air inlet chamber and the air outlet chamber, there is a piston chamber that extends laterally. The piston shaft assembly is assembled in the piston chamber, and the valve assembly is assembled in the air outlet chamber. The piston chamber near the air inlet chamber is connected to the inner cavity of the display film via a first air passage; the air outlet chamber is connected to the portion of the outer cavity located outside the shielding film via a second air passage. The shielding film is divided into multiple petals through cross-segmentation in the middle; the display film has a thin-walled cavity structure, its peripheral wall is composed of multiple layers of conical folded walls, and it has a top wall; at least the upper surface of the top wall of the display film is a different color from the upper surface of the shielding film. When the internal air pressure is greater than the external air pressure, the conical folded wall of the display film is stretched, the top wall deforms and squeezes the shielding film, causing multiple petals of the shielding film to deform and form an open slit, through which the top wall of the display film is exposed from the shielding film.

6. A dual-cavity flow indicator according to claim 5, characterized in that: The display film includes a first cone portion and a second cone portion stacked vertically; the upper end of the first cone portion is closed and includes a first conical wall and an annular wall located at the lower outer edge and connected to the first conical wall; the second cone portion includes a second conical wall, and the upper edge of the second conical wall is connected to the inner edge of the annular wall; cavities with open lower ends and communicating with each other are formed in the first cone portion and the second cone portion.

7. A dual-cavity flow indicator according to claim 6, characterized in that: The upper end of the first cone is provided with a horizontal dome wall, and the thickness of the first cone wall and the dome wall is greater than the thickness of the second cone wall and the annular wall; the angle between the generatrix of the first cone wall and the axis is greater than the angle between the generatrix of the second cone wall and the axis.

8. A dual-cavity flow indicator according to claim 2, characterized in that: The first conical wall and the dome wall are of equal thickness; the second conical wall and the annular wall are of equal thickness; the thickness of the first conical wall and the dome wall is more than twice the thickness of the second conical wall and the annular wall.

9. A dual-cavity flow indicator according to claim 2, characterized in that: The thickness of the first conical wall and the dome wall is 0.45 to 0.6 mm, and the thickness of the second conical wall and the annular wall is 0.15 to 0.25 mm; the maximum diameter of the second cone is 1.2 to 1.5 times the maximum diameter of the first cone; the angle between the generatrix of the first conical wall and the axis is 30° to 45°, and the angle between the generatrix of the second conical wall and the axis is 9° to 15°.

10. A dual-cavity flow indicator according to claim 1, characterized in that: The housing includes a vertical portion and a horizontal portion; the vertical portion includes a first vertical cylinder and a second vertical cylinder arranged side by side; the horizontal portion includes a small-diameter pipe located above the first vertical cylinder, a large-diameter pipe located above the second vertical cylinder, and a base located above the small-diameter pipe and the large-diameter pipe; the display cavity is disposed within the base, and the transparent cover is fixed above the base; The air inlet chamber is located inside the first vertical cylinder, the air outlet chamber is located inside the second vertical cylinder, and the inner and outer diameters of the small-diameter pipe are both smaller than those of the large-diameter pipe. The piston shaft assembly includes a piston rod and a spring, wherein the piston head of the piston rod is located inside the small-diameter tube, and the rod portion of the piston rod is located inside the large-diameter tube; The upper end of the first vertical cylinder gradually narrows in diameter from bottom to top and connects to the small-diameter pipe, thereby forming a recessed portion in the upper section of the first vertical cylinder and on both sides of the small-diameter pipe. The recessed portion is provided with an inclined tube extending obliquely upward from the side of the second vertical cylinder toward the first vertical cylinder to the base. The inclined tube is provided with a first inclined air passage, and the base is provided with a second inclined air passage that is obliquely upward in the opposite direction. The first inclined air passage and the second inclined air passage constitute the second air passage.

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