Air flow standard device

Abstract

The utility model discloses an air flow standard device which comprises a static pressure chamber, one end of the static pressure chamber is provided with an air inlet experiment pipeline, one end of the air inlet experiment pipeline is communicated with the static pressure chamber through a sealing butt joint assembly, an outlet static pressure ring is installed outside the air inlet experiment pipeline, and the other end of the air inlet experiment pipeline is provided with an air inlet driving fan. The static pressure chamber is symmetrically provided with a nozzle front static pressure hole and a nozzle rear static pressure hole, and the nozzle front static pressure hole and the nozzle rear static pressure hole are connected with a differential pressure gauge through pipelines. Measurement calibration work can be carried out on the most core air flow parameter of building air tightness detection, and the accuracy of building air tightness detection is improved.

Description

Technical Field

[0001] This utility model relates to the field of building air tightness testing technology, specifically to an air flow standard device, and more particularly to an air flow standard device for calibrating a building overall air tightness testing system. Background Technology

[0002] Building airtightness refers to a building's ability to prevent air infiltration when closed, characterizing the amount of unorganized air permeation in a building or room under normal sealing conditions. Building airtightness is a core performance indicator for low-energy buildings, and airtightness testing is a crucial means of verifying whether a building's airtightness meets standards. Currently, the main airtightness testing method in China is the fan pressure method, using a "Building Overall Airtightness Testing System" as the testing equipment. This system mainly includes a blower, pressure measuring device, and airflow measuring system. This equipment can apply positive and negative pressure to the building interior within a specified pressure range, providing a stable airflow under a set pressure difference, and can read the airflow value.

[0003] The working principle of the building overall air tightness testing system is to install an adjustable-size door and an attached fan on the door frame of the building envelope. The fan can adjust the wind speed or automatically change the frequency to achieve a reference pressure difference between the inside and outside of the building. Under the reference pressure difference, the air permeability of the building envelope is measured.

[0004] Currently, there are no metrological calibration standards for this type of testing equipment in China. Testing institutions and users can only calibrate the pressure and temperature parameters of this type of testing equipment, but no metrological calibration work has been carried out for the air flow parameter, which is the most critical parameter for building airtightness testing.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to propose an air flow standard device.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: an air flow standard device includes a static pressure chamber, one end of which is provided with an air intake test pipe, one end of which is connected to the static pressure chamber through a sealing docking assembly, an outlet static pressure ring is installed outside the air intake test pipe, and an air intake drive fan is installed at the other end of the air intake test pipe. A nozzle front static pressure hole and a nozzle rear static pressure hole are symmetrically opened on the static pressure chamber, and a differential pressure gauge is connected to the nozzle front static pressure hole and the nozzle rear static pressure hole through a pipeline.

[0008] Preferably, a perforated plate one and a perforated plate two are fixedly installed in the static pressure chamber, and a partition is fixedly installed between the perforated plate one and the perforated plate two in the static pressure chamber. Flow nozzles are symmetrically installed on the partition, wherein static pressure holes before the nozzles and static pressure holes after the nozzles are respectively opened on both sides of the partition.

[0009] Preferably, an exhaust chamber is provided on the side of the perforated plate away from the partition, and an exhaust drive fan is installed at the end of the static pressure chamber away from the air intake test pipe, and the exhaust drive fan is connected to the air outlet on the static pressure chamber.

[0010] Preferably, the sealing assembly includes a connecting mounting ring, on which an outer support connecting sleeve is detachably provided. An annular protrusion is integrally provided on the outer side of the outer support connecting sleeve. The annular protrusion passes through the connecting mounting ring through a connecting bolt, and the other end of the connecting bolt is connected to the static pressure chamber. One end of the air intake test pipe extends into the outer support connecting sleeve and is integrally connected to a limit stop ring.

[0011] Preferably, the inner wall of the outer support connecting sleeve is provided with an annular assembly groove, the inner side wall of the annular assembly groove is provided with a plurality of annular abutment plates, the inner side of the annular abutment plates is provided with a plurality of arc-shaped abutment blocks, and the arc-shaped abutment blocks are in contact with the outer wall of the air intake test pipe.

[0012] Preferably, a corresponding arc-shaped support frame is connected between the annular contact plate and the arc-shaped contact block, and several elastic contact balls are fixedly installed on the arc-shaped support frame. Sealing strips are provided at the connection between the upper and lower ends of the annular assembly groove and the air intake test pipe.

[0013] This utility model provides an airflow standard device, which has the following advantages:

[0014] The static pressure chamber simulates the internal space of a building envelope. An air intake test pipe is connected to one end of the static pressure chamber via a sealed connection assembly, facilitating the connection and ensuring good sealing. An air intake-driven fan blows air into the static pressure chamber. After passing through a perforated plate, the air is ejected from the flow nozzle. Because static pressure holes are located before and after the flow nozzle, a standard airflow value is obtained using the static pressure holes before and after the flow nozzle, along with a differential pressure gauge. The airflow value is read by the main unit of the building's overall airtightness testing system. By comparing the two sets of data, the test error can be determined. This invention is convenient to use, facilitates the installation and connection of the air intake test pipe, and ensures good sealing after connection, avoiding air leakage at the connection point. It can perform metrological calibration of the most crucial airflow parameter in building airtightness testing, improving the accuracy of building airtightness testing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of an airflow standard device according to an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the static pressure chamber in an air flow standard device according to an embodiment of the present utility model;

[0018] Figure 3 This is a structural schematic diagram of a sealing docking assembly in an airflow standard device according to an embodiment of the present utility model;

[0019] Figure 4 This is an enlarged view of point A in an airflow standard device according to an embodiment of the present utility model.

[0020] In the picture:

[0021] 1. Static pressure chamber; 2. Inlet test pipe; 3. Sealing assembly; 4. Outlet static pressure ring; 5. Inlet drive fan; 6. Static pressure hole before nozzle; 7. Pipeline; 8. Differential pressure gauge; 9. Perforated plate one; 10. Perforated plate two; 11. Baffle; 12. Flow nozzle; 13. Exhaust chamber; 14. Exhaust drive fan; 15. Outlet; 16. Connecting mounting ring; 17. External support connecting sleeve; 18. Annular protrusion; 19. Connecting bolt; 20. Limiting ring; 21. Annular assembly groove; 22. Annular contact plate; 23. Arc-shaped contact block; 24. Arc-shaped support frame; 25. Elastic contact ball; 26. Sealing strip. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4This utility model provides an airflow standard device, including a static pressure chamber 1. One end of the static pressure chamber 1 is equipped with an air intake test pipe 2. One end of the air intake test pipe 2 is connected to the static pressure chamber 1 via a sealing connection assembly 3. The static pressure chamber 1 simulates the internal space of a building envelope. Connecting the air intake test pipe 2 to one end of the static pressure chamber 1 via the sealing connection assembly 3 facilitates the connection between the air intake test pipe 2 and the static pressure chamber 1, ensuring good sealing after connection. An outlet static pressure ring 4 is installed outside the air intake test pipe 2, and an air intake drive fan 5 is installed at the other end of the air intake test pipe 2. The pressure chamber 1 is symmetrically provided with a static pressure hole 6 before the nozzle and a static pressure hole after the nozzle. The static pressure hole 6 before the nozzle and the static pressure hole after the nozzle are connected to a differential pressure gauge 8 through a pipeline 7. The air is blown into the static pressure chamber 1 by the air intake driven fan 5. After the air passes through the perforated plate 9, it is ejected from the flow nozzle 12. Since the static pressure hole 6 before the nozzle and the static pressure hole after the nozzle are set before and after the flow nozzle 12, the standard air volume value is obtained by the static pressure hole 6 before the nozzle, the static pressure hole after the nozzle, and the flow nozzle 12 in conjunction with the differential pressure gauge 8. The host of the building overall air tightness test system can read the air volume value. By comparing the two sets of data, the test error can be obtained.

[0024] Please refer to the instruction manual appendix. Figure 2 As shown, a perforated plate 9 and a perforated plate 10 are fixedly installed in the static pressure chamber 1. A partition 11 is fixedly installed between the perforated plate 9 and the perforated plate 10 in the static pressure chamber 1. Flow nozzles 12 are symmetrically installed on the partition 11. Static pressure holes 6 in front of the nozzles and static pressure holes 6 behind the nozzles are respectively opened on both sides of the partition 11. An exhaust chamber 13 is provided on the side of the perforated plate 10 away from the partition 11. An exhaust drive fan 14 is installed at the end of the static pressure chamber 1 away from the air intake test pipe 2. The exhaust drive fan 14 is connected to the air outlet 15 on the static pressure chamber 1. The intake drive fan 5 blows air into the static pressure chamber 1. After passing through the perforated plate 9, the air is ejected from the flow nozzle 12. Since the front static pressure hole 6 and the rear static pressure hole are set before and after the flow nozzle 12, the standard air volume value is obtained by the differential pressure gauge 8 through the front static pressure hole 6, the rear static pressure hole and the flow nozzle 12. Then the air flows through the perforated plate 10 again to reach the exhaust chamber 13, and finally is discharged by the exhaust drive fan 14.

[0025] Please refer to the instruction manual appendix. Figure 3As shown, the sealing assembly 3 includes a connecting mounting ring 16, on which an outer support connecting sleeve 17 is detachably mounted. An annular protrusion 18 is integrally formed on the outer side of the outer support connecting sleeve 17. The annular protrusion 18 passes through the connecting mounting ring 16 via a connecting bolt 19, and the other end of the connecting bolt 19 is connected to the static pressure chamber 1. One end of the intake test pipe 2 extends into the outer support connecting sleeve 17 and is integrally connected to a limit stop ring 20. By connecting the annular protrusion 18 and the connecting mounting ring 16 with the connecting bolt 19, and installing it to one end of the static pressure chamber 1, the installation of the outer support connecting sleeve 17 is achieved, thus facilitating the insertion of the intake test pipe 2.

[0026] In one embodiment, please refer to the appendix to the specification. Figure 4 As shown, the inner wall of the outer support connecting sleeve 17 is provided with an annular assembly groove 21. The inner side wall of the annular assembly groove 21 is provided with several annular abutment plates 22. The inner side of the annular abutment plates 22 is provided with several arc-shaped abutment blocks 23. The arc-shaped abutment blocks 23 are attached to the outer wall of the air intake test pipe 2. A corresponding arc-shaped support frame 24 is connected between the annular abutment plates 22 and the arc-shaped abutment blocks 23. Several elastic abutment balls 25 are fixedly installed on the arc-shaped support frame 24. Sealing strips 26 are provided at the connection between the upper and lower ends of the annular assembly groove 21 and the air intake test pipe 2. An annular contact plate 22 is installed in the annular assembly groove 21, and the arc-shaped contact block 23 contacts the air intake test pipe 2 to achieve connection. The insertion of the air intake test pipe 2 will cause the arc-shaped support frame 24 to deform inward synchronously under the action of the elastic contact ball 25, thereby generating a reverse force to achieve connection. A sealing strip 26 is set to seal the connection between the top of the annular assembly groove 21 and the air intake test pipe 2, thereby improving the sealing effect and avoiding air leakage.

[0027] In practical applications, the static pressure chamber 1 simulates the internal space of the building envelope. The air intake test pipe 2 is connected to one end of the static pressure chamber 1 through the sealing docking component 3, which facilitates the connection between the air intake test pipe 2 and the static pressure chamber 1, ensuring good sealing after connection. The air intake drive fan 5 blows air into the static pressure chamber 1. After passing through the perforated plate 9, the air is ejected from the flow nozzle 12. Since the static pressure hole 6 before the nozzle and the static pressure hole 6 after the nozzle are set before and after the flow nozzle 12, the standard air volume value is obtained by using the static pressure hole 6 before the nozzle, the static pressure hole 6 after the nozzle, and the flow nozzle 12 in conjunction with the differential pressure gauge 8. The host of the building overall air tightness test system can read the air volume value. By comparing the two sets of data, the test error can be obtained. This utility model is easy to use, facilitates the installation and connection of the air intake test pipe 2, and has good sealing after connection, avoiding air leakage at the connection point. It can carry out metrological calibration of the most critical air flow parameter for building air tightness testing, improving the accuracy of building air tightness testing.

[0028] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An airflow standard device, characterized in that, It includes a static pressure chamber (1), one end of which is provided with an air intake test pipe (2). One end of the air intake test pipe (2) is connected to the static pressure chamber (1) through a sealing docking assembly (3). An outlet static pressure ring (4) is installed outside the air intake test pipe (2). An air intake drive fan (5) is installed at the other end of the air intake test pipe (2). A nozzle front static pressure hole (6) and a nozzle rear static pressure hole are symmetrically opened on the static pressure chamber (1). The nozzle front static pressure hole (6) and the nozzle rear static pressure hole are connected to a differential pressure gauge (8) through a pipeline (7).

2. The air flow rate standard device according to claim 1, characterized in that, A perforated plate 1 (9) and a perforated plate 2 (10) are fixedly installed in the static pressure chamber (1). A partition plate (11) is fixedly installed between the perforated plate 1 (9) and the perforated plate 2 (10) in the static pressure chamber (1). Flow nozzles (12) are symmetrically installed on the partition plate (11). The static pressure hole (6) in front of the nozzle and the static pressure hole in back of the nozzle are respectively opened on both sides of the partition plate (11).

3. The air flow rate standard device according to claim 2, characterized in that, An exhaust chamber (13) is provided on the side of the perforated plate (10) away from the partition (11). An exhaust drive fan (14) is installed at the end of the static pressure chamber (1) away from the air intake test pipe (2). The exhaust drive fan (14) is connected to the air outlet (15) on the static pressure chamber (1).

4. An air flow rate standard device according to claim 3, characterized in that, The sealing docking assembly (3) includes a connecting mounting ring (16), on which an outer support connecting sleeve (17) is detachably provided. An annular protrusion (18) is integrally provided on the outer side of the outer support connecting sleeve (17). The annular protrusion (18) passes through the connecting mounting ring (16) through a connecting bolt (19), and the other end of the connecting bolt (19) is connected to the static pressure chamber (1). One end of the air intake test pipe (2) extends into the outer support connecting sleeve (17) and is integrally connected to a limit stop ring (20).

5. An air flow rate standard device according to claim 4, characterized in that, The inner wall of the outer support connecting sleeve (17) is provided with an annular assembly groove (21), the inner side wall of the annular assembly groove (21) is provided with several annular abutment plates (22), the inner side of the annular abutment plates (22) is provided with several arc-shaped abutment blocks (23), and the arc-shaped abutment blocks (23) are in contact with the outer wall of the air intake test pipe (2).

6. An air flow rate standard device according to claim 5, characterized in that, A corresponding arc-shaped support frame (24) is connected between the annular contact plate (22) and the arc-shaped contact block (23). Several elastic contact balls (25) are fixedly installed on the arc-shaped support frame (24). A sealing strip (26) is provided at the connection between the upper and lower ends of the annular assembly groove (21) and the air intake test pipe (2).

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