Pipeline assembly and loop gas flow calibrating device

Abstract

The utility model relates to the technical field of fluid measurement and verification, and discloses a pipeline assembly and a loop gas flow verification device.The pipeline assembly comprises a pipe body, a filter and a sealing element, the pipe body comprises a first pipe section and a second pipe section which are detachably connected, the filter is arranged in the pipe body and comprises a mounting part and a filtering part, and the filtering part comprises a conical filtering net; the conical filter screen is connected between the first pipe section and the second pipe section through the mounting part, the sealing element is arranged between the first pipe section and the mounting part and / or between the second pipe section and the mounting part, and the sealing element is used for sealing a gap at the joint of the pipe body and the mounting part. The pipeline assembly is good in filtering effect and small in pressure loss, in addition, the sealing pieces are arranged between the first pipe section and the installation part and / or between the second pipe section and the installation part so that gaps at the connecting positions can be blocked, and the sealing effect of the pipeline assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fluid measurement and verification, especially relates to a pipeline assembly and a loop gas flow verification device. BACKGROUND

[0002] This part provides only background information related to the present disclosure, which is not necessarily prior art.

[0003] When using the loop gas flow standard device to verify the flowmeter to be verified, a filter needs to be arranged on the conveying medium pipeline to filter the medium conveyed in the pipeline, so as to eliminate impurities in the medium and protect the normal use of the valve and equipment.

[0004] The filter currently used is large in size and occupies much installation space, and the existing filter has large pressure loss, low filtering efficiency and poor filtering effect. UTILITY MODEL CONTENT

[0005] The utility model discloses a pipeline assembly and a loop gas flow verification device.

[0006] The utility model discloses a pipeline assembly, which comprises:

[0007] The pipe body comprises a first pipe segment and a second pipe segment which are detachably connected.

[0008] The filter is arranged in the interior of the pipe body, and comprises a mounting portion and a filtering portion.

[0009] The sealing member is arranged between the first pipe segment and the mounting portion and / or between the second pipe segment and the mounting portion, and is used for sealing the gap at the connecting position of the pipe body and the mounting portion.

[0010] The pipeline assembly of the utility model is provided with the conical filter screen, the conical filter screen is small in size and is arranged in the interior of the pipe body, so that the external installation space is saved, the filtering effect of the conical filter screen is good and the pressure loss is small, the filtering effect is improved, and in addition, the sealing member is arranged between the first pipe segment and the mounting portion, between the second pipe segment and the mounting portion or between the first pipe segment and the second pipe segment and the mounting portion, so that the gap at the connecting position of the pipe body and the mounting portion is sealed, and the sealing effect of the pipeline assembly is improved.

[0011] In addition, the pipeline assembly according to the utility model can also have the following additional technical features:

[0012] In some embodiments of the utility model, the conical filter screen has opposite open end and closed end in axial direction, the open end of the conical filter screen is connected with the mounting part, and the mounting part extends outward from the outer circumferential surface of the filter part along the axial direction perpendicular to the conical filter screen.

[0013] In some embodiments of the utility model, the conical filter screen comprises at least one layer of filter screen, a plurality of filter holes are uniformly and spacedly arranged on the filter screen, and the conical filter screen is a stainless steel filter screen.

[0014] In some embodiments of the utility model, the conical filter screen comprises two layers of filter screens, and a gap is formed between the two layers of filter screens.

[0015] In some embodiments of the utility model, a plurality of filter holes are arranged on each layer of filter screens, and the filter holes between the two layers of filter screens at least partially overlap in the axial direction of the filter holes.

[0016] In some embodiments of the utility model, the sealing member comprises a first sealing member, the first sealing member is arranged between the first pipe segment and the mounting part, one side of the first sealing member towards the first pipe segment is provided with a first limiting end face, one side of the first pipe segment towards the first sealing member is provided with a first matching end face, and the first limiting end face is used for abutting and matching with the first matching end face.

[0017] In some embodiments of the utility model, the first sealing member comprises a first sealing gasket, the first sealing gasket comprises an outer ring, a winding ring and an inner ring, the outer ring is tightly abutted to the outer sidewall of the winding ring, the inner ring is tightly abutted to the inner sidewall of the winding ring, one side of the inner ring and the winding ring towards the pipe body forms the first limiting end face, and the first pipe segment comprises a first flange, and the first flange is provided with the first matching end face.

[0018] In some embodiments of the utility model, the sealing member further comprises a second sealing member, the second sealing member is arranged between the second pipe segment and the mounting part, one side of the second sealing member towards the second pipe segment is provided with a second limiting end face, one side of the second pipe segment towards the second sealing member is provided with a second matching end face, and the second limiting end face is used for abutting and matching with the second matching end face.

[0019] Another aspect of the utility model provides a ring channel gas flow calibration device, which comprises a calibration assembly and a pipeline assembly as any one of the above, the calibration assembly comprises a detection pipeline, a to-be-detected flowmeter and a standard flowmeter, the pipe body is communicated with the detection pipeline, and the to-be-detected flowmeter and the standard flowmeter are arranged on the detection pipeline and sequentially arranged along the fluid flow direction.

[0020] In some embodiments of the utility model, the ring road gas flow calibration device still includes differential pressure detection subassembly, differential pressure detection subassembly includes differential pressure transmitter, first pressure tapping pipe, second pressure tapping pipe and five valve group, differential pressure transmitter is connected with five valve group, one end of first pressure tapping pipe communicates with first pipe section, other end communicates with five valve group, one end of second pressure tapping pipe communicates with second pipe section, other end communicates with five valve group. BRIEF DESCRIPTION OF DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present utility. Furthermore, like reference numerals are intended to represent the same components throughout the drawings. In the drawings:

[0022] Figure 1 The structural schematic view of the pipeline assembly according to the embodiments of the utility model is schematically shown;

[0023] Figure 2 The exploded view of the pipeline assembly according to the embodiments of the utility model is schematically shown;

[0024] Figure 3 The structural schematic view of the filter of the pipeline assembly according to the embodiments of the utility model is schematically shown;

[0025] Figure 4 The structural schematic view of the first sealing gasket of the pipeline assembly according to the embodiments of the utility model is schematically shown;

[0026] Figure 5 The structural schematic view of the gas flow calibration device according to the embodiments of the utility model is schematically shown;

[0027] Figure 6 For Figure 5 The enlarged view of A in FIG. 4.

[0028] The reference signs are as follows:

[0029] 1, pipe body; 11, first pipe section; 111, first flange; 12, second pipe section; 121, second flange;

[0030] 2, filter; 21, mounting portion; 22, filtering portion; 221, conical filter screen; 2211, filter hole;

[0031] 31, first sealing member; 311, first sealing gasket; 3111, outer ring; 3112, winding ring; 3113, inner ring; 32, second sealing member; 321, second sealing gasket;

[0032] 4. Connecting component; 41. Screw; 42. First nut; 43. Second nut;

[0033] 51. Testing pipeline; 52. Flow meter to be tested; 53. Standard flow meter;

[0034] 6. Differential pressure transmitter;

[0035] 71. First pressure tap; 72. Second pressure tap;

[0036] 8. Five-valve assembly;

[0037] 9. Fan. Detailed Implementation

[0038] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0039] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0040] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0041] For the sake of description, spatial relative terms can be used herein for describing the relationship between one element or feature to another element or feature as shown in the figures, such as "inner", "outer", "inner side", "outer side", "under", "below", "above", "on", and the like. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" or "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The embodiments are not limited in this context.

[0042] In the related art, the LGH type high pressure loop gas flow standard device uses clean air as a medium, and makes the air circulate in a sealed loop pipe through a high pressure fan, makes the air in the loop reach a set pressure value through a compressor and a pressure regulating valve group, makes the temperature in the loop also reach a set value through a heat exchanger and a cooling system, and then obtains the error and repeatability of the detected meter by comparing the volume flow passing through the detected meter and the standard meter in the same period. When the loop gas flow standard device is used to calibrate the flow meter to be detected, a filter needs to be arranged on the conveying medium pipeline to filter the medium conveyed in the pipeline to eliminate impurities in the medium, thereby protecting the normal use of the valve and the equipment.

[0043] The filter currently used includes a shell, a filter core assembly and an upper cover, the filter core assembly is installed in the shell, the upper cover is installed on the top of the shell, air inlets and air outlets are arranged on both sides of the filter shell, and the filter is connected with the pipeline of the device through the air inlets and the air outlets. The size of the filter is large, and the filter is installed outside the pipeline, so that more installation space is occupied. In addition, the filter screen of the existing filter is cylindrical, the pressure loss of the filter screen is large, the larger the pressure loss of the filter, the more energy is needed to send air into the filter, thereby affecting the performance of the filter, resulting in low filtering efficiency and poor filtering effect of the filter.

[0044] Therefore, the pipeline assembly is provided to solve the above technical problems by arranging the conical filter 2, the conical filter 2 has a small volume, and is installed inside the pipe body 1 to save external installation space. In addition, the conical filter 2 has good filtering effect and small pressure loss, and improves the filtering effect.

[0045] As Figures 1 to 4As shown, according to the embodiment of the utility model, a kind of pipeline assembly is provided, the pipeline assembly includes pipe body 1, filter 2 and sealing element, pipe body 1 includes detachably connected first pipe segment 11 and second pipe segment 12, filter 2 is arranged in the inside of pipe body 1, filter 2 includes mounting portion 21 and filter portion 22, filter portion 22 includes conical filter screen 221, conical filter screen 221 is connected between first pipe segment 11 and second pipe segment 12 by mounting portion 21, sealing element is arranged between first pipe segment 11 and mounting portion 21, or sealing element is arranged between second pipe segment 12 and mounting portion 21, or sealing element is arranged between first pipe segment 11 and mounting portion 21 and between second pipe segment 12 and mounting portion 21, and sealing element is used to seal the gap of the connecting place of first pipe segment 11 and mounting portion 21 or second pipe segment 12 and mounting portion 21.

[0046] The pipeline assembly of the utility model sets up filter 2, filter 2 includes mounting portion 21 and conical filter screen 221, filter 2 is small in volume, and is installed in the inside of pipe body 1, saves external installation space, and the filtering effect of conical filter screen 221 is good, and pressure loss is small, improves filtering effect, and in addition, sealing element is arranged between first pipe segment 11 and mounting portion 21 or between second pipe segment 12 and mounting portion 21 or simultaneously between first pipe segment 11 and second pipe segment 12 and mounting portion 21, to seal the gap of the connecting place of pipe body 1 and mounting portion 21, improve the sealing effect of pipeline assembly.

[0047] In some embodiments of the utility model, conical filter screen 221 has opposite open end and closed end in axial direction, and the open end of conical filter screen 221 is connected with mounting portion 21, and mounting portion 21 extends outward from the outer circumferential surface of filter portion 22 along the axial direction perpendicular to conical filter screen 221.

[0048] Conical filter screen 221 can be sharp bottom conical filter screen, and the cross-sectional shape of sharp bottom conical filter screen is conical;Or, conical filter screen 221 can be flat bottom conical filter screen, and the cross-sectional shape of flat bottom conical filter screen is truncated cone.In this embodiment, the cross-sectional shape of conical filter screen 221 is conical.The conical filter screen 221 includes at least one layer of filter screen, and a plurality of filter holes 2211 are uniformly and spacedly arranged on the filter screen, and the conical filter screen 221 has an open end and a closed end, and the open end is arranged upstream of the closed end along the flow direction of the gas, that is, during operation, the gas flows into the conical filter screen 221 from the open end, and after being filtered by the conical filter screen 221, impurities are filtered and retained in the conical filter screen 221, and clean gas flows out through the filter holes 2211.

[0049] The conical filter screen 221 is a stainless steel filter screen, by setting the conical filter screen 221 as stainless steel material, so that the filter 2 is firm and durable, can withstand high pressure and temperature, is suitable for various harsh working environments, prolongs the service life.

[0050] In some embodiments of the utility model, the conical filter screen 221 includes two layers of filter screens, and a gap is formed between the two layers of filter screens. By setting two layers of filter screens, the filtering area is increased, the filtering efficiency is improved, and in addition, the conical filter screen 221 has a uniform filtering structure and can uniformly distribute the filtering pressure, thereby improving the filtering effect.

[0051] In some embodiments of the utility model, a plurality of filter holes 2211 are arranged on each layer of filter screens, and the filter holes 2211 between the two layers of filter screens at least partially overlap in the axial direction of the filter holes 2211, so that the filtering effect is improved while the pressure loss is reduced, the performance of the filter 2 is ensured, and the filtering efficiency of the filter 2 is improved.

[0052] In some embodiments of the utility model, the sealing member includes a first sealing member 31, the first sealing member 31 is arranged between the first pipe segment 11 and the mounting portion 21, one side of the first sealing member 31 facing the first pipe segment 11 is provided with a first limiting end face, one side of the first pipe segment 11 facing the first sealing member 31 is provided with a first matching end face, and the first limiting end face is used for abutting and matching with the first matching end face. Specifically, the first sealing member 31 includes a first sealing gasket 311, the first sealing gasket 311 includes an outer ring 3111, a winding ring 3112 and an inner ring 3113, the outer ring 3111 is tightly abutted to the outer side wall of the winding ring 3112, the inner ring 3113 is tightly abutted to the inner side wall of the winding ring 3112, one side of the inner ring 3113 and the winding ring 3112 facing the pipe body 1 forms the first limiting end face, the first pipe segment 11 includes a first flange 111, the first flange 111 is provided with the first matching end face, and the first flange 111 is provided with a plurality of first mounting holes in the circumferential direction. The second pipe segment 12 includes a second flange 121, the second flange 121 is provided with a plurality of second mounting holes in the circumferential direction, and the plurality of second mounting holes are arranged one by one corresponding to the plurality of first mounting holes.

[0053] In the embodiment, the pipeline assembly further comprises a plurality of sets of connecting members 4, each set of connecting members 4 comprising a screw rod 41, a first nut 42 and a second nut 43, the plurality of screw rods 41 being arranged in one-to-one correspondence with the plurality of first mounting holes, and the first nut 42 and the second nut 43 being threadedly connected with the screw rod 41. When assembling, the first sealing gasket 311 is mounted between the first flange 111 and the side of the mounting portion 21 away from the filter portion 22, the first limiting end face is abutted against the first matching end face, the screw rod 41 penetrates the first mounting hole and the second mounting hole, and finally the first nut 42 and the second nut 43 are locked and fixed, so as to ensure the stability and reliability of the installation of the first sealing gasket 311, thereby improving the sealing performance of the connection between the first pipe section 11, the filter 2 and the second pipe section 12.

[0054] In some embodiments of the utility model, the sealing member further comprises a second sealing member 32, the second sealing member 32 is arranged between the second pipe section 12 and the mounting portion 21, the side of the second sealing member 32 towards the second pipe section 12 is provided with a second limiting end face, the side of the second pipe section 12 towards the second sealing member 32 is provided with a second matching end face, and the second limiting end face is used for abutting and matching with the second matching end face. Specifically, the second sealing member 32 comprises a second sealing gasket 321, the second sealing gasket 321 comprises an outer ring 3111, a winding ring 3112 and an inner ring 3113, the outer ring 3111 is tightly abutted against the outer side wall of the winding ring 3112, the inner ring 3113 is tightly abutted against the inner side wall of the winding ring 3112, the side of the inner ring 3113 and the winding ring 3112 towards the second flange 121 forms the second limiting end face, and the second flange 121 is provided with the second matching end face. When installing, the first sealing gasket 311 is mounted between the first flange 111 and the side of the mounting portion 21 away from the filter portion 22, the first limiting end face is abutted and matched with the first matching end face on the first flange 111, the second sealing gasket 321 is mounted between the second flange 121 and the side of the mounting portion 21 away from the filter portion 22, the second limiting end face is abutted and matched with the second matching end face on the second flange 121, finally the screw rod 41 penetrates the first mounting hole and the second mounting hole, and the first nut 42 and the second nut 43 are respectively mounted at the two ends of the screw rod 41 to press and fix the first sealing gasket 311 and the second sealing gasket 321, so as to ensure the stability and reliability of the installation of the first sealing gasket 311 and the second sealing gasket 321, thereby further improving the sealing performance of the connection between the first pipe section 11, the filter 2 and the second pipe section 12.

[0055] Another aspect of the utility model provides a loop gas flow calibration device, Figure 5 and 6As shown, the ring channel gas flow calibration device comprises a detection assembly, a differential pressure detection assembly, a fan 9 and the above-mentioned pipeline assembly, wherein the detection assembly comprises a detection pipeline 51, a to-be-detected flowmeter 52 and a standard flowmeter 53, the pipe body 1 is communicated with the detection pipeline 51, the to-be-detected flowmeter 52 and the standard flowmeter 53 are arranged on the detection pipeline 51 and arranged in sequence along the fluid flow direction. The fan 9 is arranged upstream of the filter 2, and the circulating gas in the detection pipeline 51 is filtered through the filter 2, so that the fan 9, the standard flowmeter 53 and other components can be used normally. The ring channel gas flow calibration device further comprises a differential pressure detection assembly, and the differential pressure detection assembly comprises a differential pressure transmitter 6, a first pressure taking pipe 71, a second pressure taking pipe 72 and a five-valve group 8. The differential pressure transmitter 6 is connected with the five-valve group 8, the five-valve group 8 comprises high and low pressure valves, a balance valve and two calibration (blowdown) valve groups, the five-valve group 8 is connected with the differential pressure transmitter 6, and when working, the two groups of calibration valves and the balance valve are closed. If calibration is needed, only the high and low pressure valves are cut off, the balance valve and the two calibration valves are opened, and then the balance valve is closed, so that the transmitter can be calibrated and balanced. The differential pressure transmitter 6 is provided with two pressure interfaces, which are a high pressure side interface and a low pressure side interface. One end of the first pressure taking pipe 71 is communicated with the high pressure side interface, and the other end is communicated with the first pipe section 11. One end of the second pressure taking pipe 72 is communicated with the low pressure side interface, and the other end is communicated with the second pipe section 12. The differential pressure transmitter 6 is used for measuring the real-time differential pressure of the pipeline upstream of the filter 2 (the first pipe section 11) and the pipeline downstream of the filter 2 (the second pipe section 12). If the real-time differential pressure is greater than a preset differential pressure, it indicates that the filter 2 needs to be replaced. At this time, the first nut 42, the second nut 43 and the screw rod 41 are removed, the two ends of the second pipe section 12 are respectively detached from the first pipe section 11 and the detection pipeline 51, and the filter 2 in the second pipe section 12 can be taken out for replacement or cleaning, so that the normal operation of the device can be maintained.

[0056] Of course, the ring channel gas flow calibration device of the embodiment also has other structures and components possessed by existing ring channel gas flow calibration devices. In addition, for the working principle of the ring channel gas flow calibration device, please refer to the related technology, and the present application will not be described here.

[0057] The ring channel gas flow calibration device comprises a pipeline assembly, the pipeline assembly comprises a conical filter 2, the conical filter 2 has a small volume and is installed in the pipe body 1, thereby saving external installation space. Meanwhile, the conical filter 2 has good filtering effect and small pressure loss, thereby improving the filtering effect. In addition, a sealing element is arranged between the first pipe section 11 and the mounting portion 21, between the second pipe section 12 and the mounting portion 21, or between the first pipe section 11, the second pipe section 12 and the mounting portion 21 at the same time, so as to seal the gap between the pipe body 1 and the mounting portion 21, thereby improving the sealing effect of the pipeline assembly.

[0058] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A plumbing assembly, comprising: The utility model relates to a pipe assembly for calibrating gas flow, comprising: a pipe body comprising a first pipe segment and a second pipe segment connected detachably; a filter arranged inside the pipe body, the filter comprising a mounting portion and a filtering portion, the filtering portion comprising a conical filter screen connected between the first pipe segment and the second pipe segment through the mounting portion; a sealing member arranged between the first pipe segment and the mounting portion and / or between the second pipe segment and the mounting portion, the sealing member being used to seal the gap at the connection between the pipe body and the mounting portion.

2. The plumbing assembly of claim 1, wherein, The conical filter screen has opposite open ends and closed ends in the axial direction, the open ends of the conical filter screen are connected to the mounting portion, and the mounting portion extends outward from the outer circumferential surface of the filtering portion along a direction perpendicular to the axial direction of the conical filter screen.

3. The plumbing assembly of claim 1, wherein, The conical filter screen comprises at least one layer of filter screen, and a plurality of filter holes are uniformly and spacedly arranged on the filter screen, and the conical filter screen is a stainless steel filter screen.

4. The plumbing assembly of claim 3, wherein, The conical filter screen comprises two layers of filter screen, and a gap is formed between the two layers of filter screen.

5. The plumbing assembly of claim 3, wherein, A plurality of filter holes are arranged on each layer of filter screen, and the filter holes between the two layers of filter screen at least partially overlap in the axial direction of the filter holes.

6. The plumbing assembly of claim 1, wherein, The sealing member comprises a first sealing member arranged between the first pipe segment and the mounting portion, a first limiting end face is arranged on the side of the first sealing member facing the first pipe segment, a first matching end face is arranged on the side of the first pipe segment facing the first sealing member, and the first limiting end face is used to abut and match with the first matching end face.

7. The plumbing assembly of claim 6, wherein, The first sealing member comprises a first sealing gasket, the first sealing gasket comprises an outer ring, a winding ring and an inner ring, the outer ring is tightly abutted to the outer sidewall of the winding ring, the inner ring is tightly abutted to the inner sidewall of the winding ring, the inner ring and the winding ring form the first limiting end face on the side of the pipe body, and the first pipe segment comprises a first flange, and the first matching end face is arranged on the first flange.

8. The plumbing assembly of any one of claims 1 to 7, wherein, The sealing member further comprises a second sealing member arranged between the second pipe segment and the mounting portion, a second limiting end face is arranged on the side of the second sealing member facing the second pipe segment, a second matching end face is arranged on the side of the second pipe segment facing the second sealing member, and the second limiting end face is used to abut and match with the second matching end face.

9. A loop gas flow prover, characterized by, The utility model relates to a pipe assembly for calibrating gas flow, comprising:

10. The loop gas flow calibration device of claim 9, wherein, a pipe body comprising a first pipe segment and a second pipe segment connected detachably; a filter arranged inside the pipe body, the filter comprising a mounting portion and a filtering portion, the filtering portion comprising a conical filter screen connected between the first pipe segment and the second pipe segment through the mounting portion; a sealing member arranged between the first pipe segment and the mounting portion and / or between the second pipe segment and the mounting portion, the sealing member being used to seal the gap at the connection between the pipe body and the mounting portion. The conical filter screen has opposite open ends and closed ends in the axial direction, the open ends of the conical filter screen are connected to the mounting portion, and the mounting portion extends outward from the outer circumferential surface of the filtering portion along a direction perpendicular to the axial direction of the conical filter screen. The conical filter screen comprises at least one layer of filter screen, and a plurality of filter holes are uniformly and spacedly arranged on the filter screen, and the conical filter screen is a stainless steel filter screen. The conical filter screen comprises two layers of filter screen, and a gap is formed between the two layers of filter screen. A plurality of filter holes are arranged on each layer of filter screen, and the filter holes between the two layers of filter screen at least partially overlap in the axial direction of the filter holes. The sealing member comprises a first sealing member arranged between the first pipe segment and the mounting portion, a first limiting end face is arranged on the side of the first sealing member facing the first pipe segment, a first matching end face is arranged on the side of the first pipe segment facing the first sealing member, and the first limiting end face is used to abut and match with the first matching end face. The first sealing member comprises a first sealing gasket, the first sealing gasket comprises an outer ring, a winding ring and an inner ring, the outer ring is tightly abutted to the outer sidewall of the winding ring, the inner ring is tightly abutted to the inner sidewall of the winding ring, the inner ring and the winding ring form the first limiting end face on the side of the pipe body, and the first pipe segment comprises a first flange, and the first matching end face is arranged on the first flange. The sealing member further comprises a second sealing member arranged between the second pipe segment and the mounting portion, a second limiting end face is arranged on the side of the second sealing member facing the second pipe segment, a second matching end face is arranged on the side of the second pipe segment facing the second sealing member, and the second limiting end face is used to abut and match with the second matching end face. The utility model relates to a pipe assembly for calibrating gas flow, comprising: The utility model relates to a pipe assembly for calibrating gas flow, comprising: a pipe body comprising a first pipe segment and a second pipe segment connected detachably; a filter arranged inside the pipe body, the filter comprising a mounting portion and a filtering portion, the filtering portion comprising a conical filter screen connected between the first pipe segment and the second pipe segment through the mounting portion; a sealing member arranged between the first pipe segment and the mounting portion and / or between the second pipe segment and the mounting portion, the sealing member being used to seal the gap at the connection between the pipe body and the mounting portion. The conical filter screen has opposite open ends and closed ends in the axial direction, the open ends of the conical filter screen are connected to the mounting portion, and the mounting portion extends outward from the outer circumferential surface of the filtering portion along a direction perpendicular to the axial direction of the conical filter screen. The conical filter screen comprises at least one layer of filter screen, and a plurality of filter holes are uniformly and spacedly arranged on the filter screen, and the conical filter screen is a stainless steel filter screen. The conical filter screen comprises two layers of filter screen, and a gap is formed between the two layers of filter screen. A plurality of filter holes are arranged on each layer of filter screen, and the filter holes between the two layers of filter screen at least partially overlap in the axial direction of the filter holes. The sealing member comprises a first sealing member arranged between the first pipe segment and the mounting portion, a first limiting end face is arranged on the side of the first sealing member facing the first pipe segment, a first matching end face is arranged on the side of the first pipe segment facing the first sealing member, and the first limiting end face is used to abut and match with the first matching end face. The first sealing member comprises a first sealing gasket, the first sealing gasket comprises an outer ring, a winding ring and an inner ring, the outer ring is tightly abutted to the outer sidewall of the winding ring, the inner ring is tightly abutted to the inner sidewall of the winding ring, the inner ring and the winding ring form the first limiting end face on the side of the pipe body, and the first pipe segment comprises a first flange, and the first matching end face is arranged on the first flange. The sealing member further comprises a second sealing member arranged between the second pipe segment and the mounting portion, a second limiting end face is arranged on the side of the second sealing member facing the second pipe segment, a second matching end face is arranged on the side of the second pipe segment facing the second sealing member, and the second limiting end face is used to abut and match with the second matching end face. The utility model relates to a pipe assembly for calibrating gas flow, comprising: The utility model relates to a pipe assembly for calibrating gas flow, comprising: a pipe body comprising a first pipe segment and a second pipe segment connected detachably; a filter arranged inside the pipe body, the filter comprising a mounting portion and a filtering portion, the filtering portion comprising a conical filter screen connected between the first pipe segment and the second pipe segment through the mounting portion; a sealing member arranged between the first pipe segment and the mounting portion and / or between the second pipe segment and the mounting portion, the sealing member being used to seal the gap at the connection between the pipe body and the mounting portion. The conical filter screen has opposite open ends and closed ends in the axial direction, the open ends of the conical filter screen are connected to the mounting portion, and the mounting portion extends outward from the outer circumferential surface of the filtering portion along a direction perpendicular to the axial direction of the conical filter screen. The conical filter screen comprises at least one layer of filter screen, and a plurality of filter holes are uniformly and spacedly arranged on the filter screen, and the conical filter screen is a stainless steel filter screen. The conical filter screen comprises two layers of filter screen, and a gap is formed between the two layers of filter screen. A plurality of filter holes are arranged on each layer of filter screen, and the filter holes between the two layers of filter screen at least partially overlap in the axial direction of the filter holes. The sealing member comprises a first sealing member

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