A bell-shaped gas flow standard device

Abstract

The present invention provides a bell-shaped gas flow standard device applied to the technical field of flow standard devices. A barrier bag is laid between a separating disk and a bell body, and the barrier bag performs water-isolating treatment on the inner wall of the bell body to avoid direct contact between water and the bell body, effectively preventing the bell body from getting damp and rusting while also keeping the internal gas dry, preventing moist gas from entering the calibration pipeline of the standard device. The gas is squeezed into the bottom of the separating disk by compressing the air storage bag, and the pressurized air presses the barrier bag against the inner wall of the bell body. At the same time, the air filled in the bottom of the bell body presses the liquid level inside the bell body to drop, and there is a height difference with the liquid level outside the bell body. The liquid level height outside the bell body is reflected by the liquid level float. When the barrier bag is damaged, the liquid levels inside and outside the bell body are restored to balance under the influence of atmospheric pressure. The worker observes the drop of the liquid level float and gives an alarm, and replaces and repairs the barrier bag in time.

Description

Technical Field

[0001] The present application relates to the technical field of flow standard devices, and in particular to a bell-type gas flow standard device. Background Art

[0002] The standard device is a sealed standard metering chamber with variable volume composed of a coaxial movable bell jar body and a fixed liquid tank sealing liquid. The metering chamber of the standard device is filled with gas, the flow meter to be measured is connected, and the valve is opened to allow the gas in the metering chamber of the standard device to flow through the flow meter to be tested, or the standard device is emptied, and then the gas is blown into the metering chamber of the standard device through the flow meter to be tested. The time taken for the volume of gas to flow into or out of the metering chamber of the standard device is measured by a timer, and the instantaneous flow rate of the gas can be calculated by the ratio of the volume of the metering chamber to the time corresponding to the descending or ascending height of the bell jar body.

[0003] When the bell jar of the standard device moves downward, the bottom of the bell jar will be immersed in the sealing liquid in the sealing cylinder. The commonly used sealing liquid is water. The water is in direct contact with the bell jar. When the bell jar rises again, some water will adhere to the inner wall of the bell jar. The humid environment can easily cause the bell jar to rust. The contact area between water and the gas inside the bell jar is large. This part of water can easily evaporate directly. The volatilized water increases the humidity of the gas inside the bell jar. When the gas is subsequently discharged, the humid gas can easily condense and accumulate in the subsequent exhaust pipe, causing blockage of the gas pipe and affecting the calibration and use of the standard device.

[0004] In response to the above problems, this scheme has made corresponding technical assumptions, and installed a water-proof bag inside the bell jar. The bag is used to water-proof the inner wall of the bell jar to keep the inner wall of the bell jar dry. At the same time, it avoids direct contact between water and the gas inside the bell jar, and avoids the water used for sealing directly affecting the humidity of the calibration gas, thereby improving the calibration effect of the standard device. Summary of the Invention

[0005] The purpose of the present application is to isolate the inner wall of the bell jar from contact with the liquid, prevent the liquid from humidifying the gas discharged from the bell jar, and avoid affecting the exhaust pipe of the standard device. Compared with the existing technology, a bell-type gas flow standard device is provided, which divides the inner space of the bell jar and the device sealing cylinder through a partition plate, and lays a barrier bag between the partition plate and the bell jar. The barrier bag is used to perform water-proof treatment on the inner wall of the bell jar to avoid direct contact between water and the bell jar, effectively preventing the bell jar from rusting while keeping the internal gas dry, preventing humid gas from entering the calibration pipe of the standard device, and using air pressure pipes to connect the partition The air storage bag at the bottom of the plate squeezes the gas in the air storage bag into the bottom of the separator plate and increases the air pressure. The pressurized air presses the barrier bag against the inner wall of the bell jar. At the same time, the air filled at the bottom of the bell jar presses the liquid level inside the bell jar to drop. There is a height difference with the liquid level outside the bell jar. The liquid level height outside the bell jar is reflected by the liquid level float, and real-time monitoring of the standard device is realized. When the barrier bag is damaged, the air filled at the bottom of the separator plate leaks. Under the influence of atmospheric pressure, the liquid levels inside and outside the bell jar are restored to balance, and the device alarm is realized by the drop of the liquid level float, which is convenient for workers to replace and repair the barrier bag in time.

[0006] The internal space of the bell jar and the device sealing cylinder is divided into a partition plate, and a barrier bag is laid between the partition plate and the bell jar body. The barrier bag is used to perform water-proof treatment on the inner wall of the bell jar body to avoid direct contact between water and the bell jar body, effectively preventing the bell jar body from rusting while keeping the internal gas dry, preventing moist gas from entering the calibration pipeline of the standard device, and using a pneumatic pipe to connect the bottom of the partition plate with the air storage bag. By compressing the air storage bag, the gas is squeezed into the bottom of the partition plate and the air pressure is increased. The pressurized air presses the barrier bag against the inner wall of the bell jar. At the same time, the air filled at the bottom of the bell jar body presses the liquid level inside the bell jar body to drop, and there is a height difference with the liquid level outside the bell jar body. The liquid level height outside the bell jar body is reflected by the liquid level float. The standard device is monitored in real time. When the barrier bag is damaged, the air filled at the bottom of the partition plate leaks. Under the influence of atmospheric pressure, the liquid levels inside and outside the bell jar body are restored to balance. The drop of the liquid level float is used to realize the device alarm, which is convenient for workers to replace and repair the barrier bag in time.

[0007] Furthermore, the gas pipe is bent in a U shape, and the inner end of the gas pipe is higher than the top of the device sealing tube, so that the gas pipe is connected to the internal space of the bell jar body, realizing the air intake and exhaust of the standard device.

[0008] Furthermore, the interior of the device sealing cylinder is fixedly connected to a pneumatic pipe fitting, and the pneumatic pipe fitting is U-shaped. The inner ring of the pneumatic pipe fitting extends to the bottom of the separation plate. The pneumatic pipe fitting is used to connect the bottom space of the separation plate to fill the bottom of the separation plate with air.

[0009] Furthermore, the top of the air cylinder is threadedly connected to a pressing screw, and the bottom end of the pressing screw is movably connected to the top of the air bag. The air bag is made of a wavy rubber balloon. The air bag is compressed by rotating the pressing screw to facilitate the extrusion of air inside the air bag.

[0010] Furthermore, the top of the liquid float extends out of the limiting ring. The liquid float is made of foam plastic. The floating height change of the liquid float is used to react to the liquid level change inside the sealing tube of the device, and the working status of the standard device is monitored in real time.

[0011] Furthermore, a plurality of expansion rings and tightening rings are vertically and equidistantly fixed on the inner and outer sides of the barrier bag, and the expansion rings and tightening rings are equidistantly and staggered. The outer surface of the barrier bag is fixedly connected with the bag body ribs, and the bag body ribs are fixedly connected to the expansion rings and tightening rings. The barrier bag is supported by the expansion rings, which facilitates the barrier bag to stick close to the inner wall of the bell cover body. The tightening ring cooperates with the bag body ribs to tighten the bag body between two adjacent expansion rings, which facilitates the folding and contraction of the barrier bag.

[0012] Optionally, the outer ring of the separator disc is fixedly connected to a mounting ring, and the bottom of the mounting ring vertically corresponds to the expansion ring. The mounting ring is used to limit the rising height of the expansion ring. Multiple mounting rings are stacked closely from top to bottom to facilitate the folding and contraction of the barrier bag.

[0013] Furthermore, a magnet block that is attracted to the bell jar body is fixedly embedded inside the expansion ring, and the expansion ring is made of a stainless steel ring. The magnet block is used to attract the expansion ring to the inner wall of the bell jar body, so that the expansion ring drives the barrier bag and the bell jar body to rise and fall synchronously.

[0014] Furthermore, the barrier bag is made of polyurethane material, and the initial diameter of the barrier bag corresponds to the inner diameter of the bell jar body. The barrier bag made of polyurethane material has excellent wear resistance and elasticity, which makes it easy for the barrier bag to fit tightly against the inside of the bell jar body.

[0015] Furthermore, the tightening ring is made of an elastic rubber ring, and the initial diameter of the tightening ring is smaller than the internal diameter of the bell body. The bag body ribs are made of tensile fiber material. The tightening ring is used to tighten the barrier bag between the two expansion rings, and the bag body ribs are pulled to facilitate the folding and contraction of the barrier bag.

[0016] Compared with the existing technology, the advantages of this application are:

[0017] (1) This scheme divides the inner space of the bell jar and the device sealing cylinder by a partition plate, and lays a barrier bag between the partition plate and the bell jar body. The barrier bag is used to perform water-proof treatment on the inner wall of the bell jar body to avoid direct contact between water and the bell jar body, effectively preventing the bell jar body from rusting while keeping the internal gas dry, preventing moist gas from entering the calibration pipe of the standard device. The air storage bag at the bottom of the partition plate is connected by a pneumatic pipe, and the gas in the air storage bag is squeezed into the bottom of the partition plate and the air pressure is increased. The pressurized air presses the barrier bag against the inner wall of the bell jar body. At the same time, the air filled at the bottom of the bell jar body presses the liquid level inside the bell jar body to drop, and there is a height difference with the liquid level outside the bell jar body. The liquid level height outside the bell jar body is reflected by the liquid level float, realizing real-time monitoring of the standard device. When the barrier bag is damaged, the air filled at the bottom of the partition plate leaks. Under the influence of atmospheric pressure, the liquid levels inside and outside the bell jar body return to balance. The drop of the liquid level float is used to realize the device alarm, which is convenient for workers to replace and repair the barrier bag in time.

[0018] (2) The gas pipe is bent in a U-shape, and the inner end of the gas pipe is higher than the top of the sealing tube of the device, so that the gas pipe is connected to the internal space of the bell jar and the air intake and exhaust of the standard device are realized.

[0019] (3) The inside of the sealing tube of the device is fixedly connected with a pneumatic pipe fitting, and the pneumatic pipe fitting is set in a U shape. The inner circle of the pneumatic pipe fitting extends to the bottom of the separation plate. The pneumatic pipe fitting is used to connect the bottom space of the separation plate to fill the bottom of the separation plate with air.

[0020] (4) The top of the air cylinder is threadedly connected to a pressing screw, and the bottom end of the pressing screw is movably connected to the top of the air bag. The air bag is made of a wavy rubber balloon. The air bag is compressed by rotating the pressing screw, which facilitates the extrusion of air inside the air bag.

[0021] (5) The top of the liquid float extends out of the limiting ring. The liquid float is made of foam plastic. The floating height change of the liquid float is used to react to the change of the liquid level inside the sealing tube of the device, and the working status of the standard device is monitored in real time.

[0022] (6) A plurality of expansion rings and tightening rings are fixed vertically and equidistantly on the inner and outer sides of the barrier bag, and the expansion rings and tightening rings are staggered and equidistantly arranged. The outer surface of the barrier bag is fixedly connected with the bag body ribs, and the bag body ribs are fixedly connected to the expansion rings and tightening rings. The barrier bag is supported by the expansion rings, so that the barrier bag can be closely attached to the inner wall of the bell cover. The tightening ring cooperates with the bag body ribs to tighten the bag between two adjacent expansion rings, so that the barrier bag can be folded and contracted.

[0023] (7) The outer ring of the separator is fixedly connected to a mounting ring, and the bottom of the mounting ring is vertically corresponding to the expansion ring. The mounting ring is used to limit the rising height of the expansion ring. Multiple mounting rings are stacked closely from top to bottom to facilitate the folding and contraction of the barrier bag.

[0024] (8) The interior of the expansion ring is fixedly embedded with a magnet block that is attracted to the bell jar body, and the expansion ring is made of a stainless steel ring. The magnet block is used to attract the expansion ring to the inner wall of the bell jar body, so that the expansion ring drives the barrier bag and the bell jar body to move up and down synchronously.

[0025] (9) The barrier bag is made of polyurethane material, and the initial diameter of the barrier bag corresponds to the inner diameter of the bell jar body. The barrier bag made of polyurethane material has excellent wear resistance and elasticity, which makes it easy for the barrier bag to fit tightly against the inside of the bell jar body.

[0026] (10) The tightening ring is made of an elastic rubber ring, and the initial diameter of the tightening ring is smaller than the inner diameter of the bell cover body. The bag body ribs are made of tensile fiber material. The tightening ring is used to tighten the barrier bag between the two expansion rings, and the bag body ribs are pulled to facilitate the folding and contraction of the barrier bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional structural diagram of this application;

[0028] Figure 2 A side cross-sectional view of the present application;

[0029] Figure 3 For this application Figure 2 A partial enlarged view of

[0030] Figure 4 This is a demonstration diagram of the inflated state of the bottom of the separator plate of this application;

[0031] Figure 5 A three-dimensional structural diagram of the bell jar and gas pipe fittings of this application;

[0032] Figure 6 For this application Figure 1 A partial enlarged view of

[0033] Figure 7 This is a demonstration diagram of the liquid level float ring falling alarm for this application;

[0034] Figure 8 A demonstration diagram of the folding and shrinking of the barrier bag for this application;

[0035] Figure 9 A perspective view of the barrier bag for this application;

[0036] Figure 10 This is a three-dimensional structural diagram of the expansion circle of this application.

[0037] Description of the numbers in the figure:

[0038] 1. Install the sealing cylinder; 101. Guide column; 102. Guide roller; 2. Bell housing; 3. Gas pipe fittings; 301. Three-way valve; 302. Separator plate; 303. Air hole; 304. Install the abutment ring; 4. Barrier bag; 401. Expansion ring; 402. Tightening ring; 403. Bag body ribs; 404. Magnet block; 5. Pneumatic pipe fittings; 6. Pneumatic cylinder; 601. Air storage bag; 602. Pressing screw; 7. Liquid surface float; 8. Limiting ring. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] Example 1

[0041] The present invention provides a bell-shaped gas flow standard device, please refer to Figure 1-3 , including a device sealing cylinder 1, and the interior of the device sealing cylinder 1 is provided with a bell jar body 2, the middle part of the device sealing cylinder 1 is fixedly connected with a gas pipe fitting 3, the gas pipe fitting 3 is U-shaped and bent, and the inner end of the gas pipe fitting 3 is higher than the top of the device sealing cylinder 1, the gas pipe fitting 3 is connected to the internal space of the bell jar body 2, and the gas pipe fitting 3 is used to inject air into the bell jar body 2 to achieve inflation and rise of the bell jar body 2. During the subsequent verification process, the air is discharged from the gas pipe fitting 3, and the outer end of the gas pipe fitting 3 is fixedly connected with a three-way valve 301, and the other two ends of the three-way valve 301 are respectively connected to the inflation pipe and the verification outlet pipe. The top two sides of the device sealing cylinder 1 are fixedly connected with guide pillars 101. The outer part of the guide column 101 is connected in a rolling manner with a guide roller 102, which is fixedly connected to the top of the bell hood body 2. The guide roller 102 rolls on the guide column 101 to improve the lifting stability of the bell hood body 2. The top of the inner end of the gas pipe 3 is fixedly connected with a separator 302, and the middle part of the separator 302 is provided with an air hole 303 corresponding to the gas pipe 3. The air hole 303 enables the gas pipe 3 to connect with the top space of the separator 302. A barrier bag 4 is fixedly connected between the bottom end of the inner ring of the separator 302 and the bottom end of the inner ring of the bell hood body 2. The barrier bag 4 follows the lifting movement of the bell hood body 2 to achieve water-proofing of the inner wall of the bell hood body 2.

[0042] When the standard device is calibrated and deflated, the air in the bell jar body 2 is discharged from the gas pipe 3. At this time, the guide roller 102 rolls on the guide column 101, so that the bell jar body 2 is stably lowered and inserted into the water in the sealing cylinder 1 of the device. During the lowering process of the bell jar body 2, the barrier bag 4 is pulled down synchronously, and the part of the bell jar body 2 that drops below the partition plate 302 is wrapped and attached to the barrier bag 4, so that the barrier bag 4 performs water-proof treatment on the inner wall of the bell jar body 2, effectively avoiding direct contact between water and the inner wall of the bell jar body 2, effectively avoiding rusting of the bell jar body 2 caused by water moisture, keeping the gas inside the bell jar body 2 dry, preventing humid gas from entering the calibration pipeline of the standard device, effectively avoiding pipeline blockage and improving the calibration effect of the standard device;

[0043] See also Figure 4-6 The air in the air bag 601 is squeezed into the bottom of the separation plate 302 through the air pressure pipe 5, and the air in the air bag 601 is squeezed into the bottom of the separation plate 302 through the air pressure pipe 5.

[0044] When using the standard device, first rotate the pressing screw 602 on the descending air pressure cylinder 6 to squeeze the air in the air bag 601 into the bottom space of the separation plate 302 through the air pressure pipe 5, so as to achieve the inflation of the bottom space of the separation plate 302. The filled air exerts an extrusion force on the barrier bag 4 toward the inner wall of the bell jar body 2, effectively preventing the air inside the bell jar body 2 from penetrating into the gap between the barrier bag 4 and the inner wall of the bell jar body 2, and effectively reducing the loss error of the gas inside the bell jar body 2;

[0045] See also Figure 7 , the outer sleeve of the bell jar body 2 is provided with a liquid level float 7, the top of the device sealing cylinder 1 is fixedly connected with a restriction ring 8, and the restriction ring 8 is in contact with the top and bottom of the liquid level float 7. The liquid level float 7 made of foam plastic floats on the liquid surface outside the bell jar body 2, and the top of the liquid level float 7 extends out of the restriction ring 8. The floating height of the liquid level float 7 corresponds to the change of the liquid level inside the device sealing cylinder 1. After the liquid levels inside and outside the bell jar body 2 are balanced, the height of the liquid level float 7 drops, indicating that the barrier bag 4 is damaged and the standard device needs to be repaired;

[0046] After the air in the air storage bag 601 is squeezed into the bottom space of the separation plate 302, the air exists in the closed space at the bottom of the separation plate 302, thereby compressing the original liquid level height at the bottom of the separation plate 302, and the corresponding liquid level outside the bell jar body 2 rises, and the rising external liquid level drives the liquid level float 7 to float up. When the liquid level float 7 floats up and contacts the extending restriction ring 8, the squeezing of the air storage bag 601 is stopped, and the preparation work of the standard device is completed. Subsequently, when the barrier bag 4 is damaged, the liquid level at the bottom of the separation plate 302 rises under the influence of atmospheric pressure, and the air at the bottom of the separation plate 302 is compressed to discharge, and the liquid levels inside and outside the bell jar body 2 are restored to balance, and the height of the corresponding liquid level float 7 drops. The falling liquid level float 7 provides an alarm prompt to the staff, which facilitates the staff to repair the standard device in time.

[0047] Example 2

[0048] Compared with the first embodiment, this embodiment mainly adds an expansion ring 401 and a tightening ring 402. The barrier bag 4 is supported by the expansion ring 401 and tightened by the tightening ring 402 to achieve orderly folding and contraction of the barrier bag 4. Figure 8-10 , the inner and outer sides of the barrier bag 4 are respectively fixedly sleeved with a plurality of expansion rings 401 and tightening rings 402 at equal distances, and the expansion rings 401 and tightening rings 402 are staggered and arranged at equal distances. The outer surface of the barrier bag 4 is fixedly connected with the bag body ribs 403, and the bag body ribs 403 are fixedly connected with the expansion ring 401 and the tightening ring 402. The expansion ring 401 made of a stainless steel ring holds up the barrier bag 4 and sticks to the inner wall of the bell cover body 2. The tightening ring 402 made of an elastic rubber ring cooperates with the bag body ribs 403 to tighten the bag body between the two adjacent expansion rings 401 to realize the folding and contraction of the barrier bag 4. The outer ring of the separating plate 302 is fixedly connected with the mounting ring 30 4, and the bottom of the mounting ring 304 corresponds vertically to the expansion ring 401, the mounting ring 304 limits the rising height of the expansion ring 401, and blocks the mounting ring 304 from realizing the folding and contraction of the barrier bag 4. The interior of the expansion ring 401 is fixedly inlaid with a magnet block 404 that is attracted to the bell jar body 2. The magnet block 404 adsorbs the expansion ring 401 on the inner wall of the bell jar body 2, so that the expansion ring 401 drives the barrier bag 4 and the bell jar body 2 to move synchronously up and down. The initial diameter of the barrier bag 4 corresponds to the internal diameter of the bell jar body 2. The barrier bag 4 made of polyurethane material has excellent wear resistance and elasticity, which facilitates the barrier bag 4 to fit closely to the interior of the bell jar body 2.

[0049] When the standard device is calibrated and deflated, the air in the bell body 2 is discharged from the gas pipe 3, and the bell body 2 steadily descends and extends into the water in the sealing tube 1 of the device, thereby pulling the barrier bag 4 to follow the bell body 2 into the water, and the barrier bag 4 provides a water-proof effect for the bell body 2. When the bell body 2 is inflated and rises, the expansion ring 401 is adsorbed on the bell body 2 by the magnet block 404, so that the barrier bag 4 follows the bell body 2 to rise. The expansion ring 401 at the top of the barrier bag 4 first contacts the mounting ring 304 and then stops rising. At this time, the expansion ring 401 at the next height is still rising, and the barrier bag 4 between the two expansion rings 401 is contracted by the elastic force of the tightening ring 402 until the expansion ring 401 at the next height contacts the previous expansion ring 401. The expansion ring 401 and the tightening ring 402 fold and contract the barrier bag 4 in turn, so that the barrier bag 4 is restored to the state before the bell body 2 descends.

[0050] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application based on the technical solution and its improved ideas, which should be covered by the scope of protection of the present application.

Claims

1. A bell-shaped gas flow standard device, comprising a device sealing cylinder (1), wherein the interior of the device sealing cylinder (1) is provided with a bell-shaped body (2), a gas pipe (3) is fixedly connected to the middle of the device sealing cylinder (1), and a three-way valve (301) is fixedly connected to the outer end of the gas pipe (3), characterized in that: Guide pillars (101) are fixedly connected to both sides of the top of the sealing cylinder (1) of the device, and the guide pillars (101) are rollingly connected to the outside of the guide pillars (101), and the guide rollers (102) are fixedly connected to the top of the bell housing (2). A separation disk (302) is fixedly connected to the top of the inner end of the gas pipe (3), and an air hole (303) corresponding to the gas pipe (3) is opened in the middle of the separation disk (302). A barrier bag (4) is fixedly connected between the bottom end of the inner ring of the separation disk (302) and the bottom end of the inner ring of the bell housing (2); The inner side of the sealing cylinder (1) of the device is fixedly connected to the air pressure tube (5), the outer side of the sealing cylinder (1) of the device is fixedly connected to the air pressure cylinder (6), and the inner side of the air pressure cylinder (6) is fixedly connected to the air storage bag (601), the air storage bag (601) is fixedly connected to the outer side of the air pressure tube (5), the outer side of the bell housing (2) is provided with a liquid surface float (7), the top end of the sealing cylinder (1) of the device is fixedly connected to the limiting ring (8), and the limiting ring (8) is in contact with the top and bottom ends of the liquid surface float (7).

2. A bell-shaped gas flow standard device according to claim 1, characterized in that: The gas pipe (3) is bent in a U-shape, and the inner end of the gas pipe (3) is higher than the top end of the device sealing cylinder (1).

3. The bell-shaped gas flow standard device according to claim 1, characterized in that: The interior of the sealing cylinder (1) of the device is fixedly connected to a pneumatic pipe fitting (5), and the pneumatic pipe fitting (5) is arranged in a U shape, and the inner ring of the pneumatic pipe fitting (5) extends to the bottom of the separation plate (302).

4. The bell-shaped gas flow standard device according to claim 1, characterized in that: The top of the air cylinder (6) is threadedly connected to a pressing screw (602), and the bottom end of the pressing screw (602) is movably connected to the top of an air storage bag (601), and the air storage bag (601) is made of a wavy rubber balloon.

5. The bell-shaped gas flow standard device according to claim 1, characterized in that: The top end of the liquid surface float ring (7) extends out of the limiting ring (8), and the liquid surface float ring (7) is made of foam plastic.

6. The bell-shaped gas flow standard device according to claim 1, characterized in that: A plurality of expansion rings (401) and tightening rings (402) are respectively and vertically and equidistantly fixedly provided on the inner and outer sides of the barrier bag (4), and the expansion rings (401) and the tightening rings (402) are equidistantly and staggeredly arranged. The outer surface of the barrier bag (4) is fixedly connected with a bag body rib line (403), and the bag body rib line (403) is fixedly connected to the expansion ring (401) and the tightening ring (402).

7. The bell-shaped gas flow standard device according to claim 6, characterized in that: The outer ring of the separation plate (302) is fixedly connected to a mounting ring (304), and the bottom of the mounting ring (304) is vertically corresponding to the expansion ring (401).

8. The bell-shaped gas flow standard device according to claim 7, characterized in that: A magnet block (404) adsorbed to the bell housing (2) is fixedly embedded in the interior of the expansion ring (401), and the expansion ring (401) is made of a stainless steel ring.

9. The bell-shaped gas flow standard device according to claim 1, characterized in that: The barrier bag (4) is made of polyurethane material, and the initial diameter of the barrier bag (4) corresponds to the inner diameter of the bell housing (2).

10. The bell-shaped gas flow standard device according to claim 6, characterized in that: The tightening ring (402) is made of an elastic rubber ring, and the initial diameter of the tightening ring (402) is smaller than the inner diameter of the bell housing (2). The bag body reinforcement line (403) is made of a tensile fiber material.

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