Building component air tightness detection device

Abstract

The invention provides a building component airtightness detection device, relates to the technical field of building component detection, and aims to solve the problem that the surface wind speed of a test piece is too high during component airtightness testing. The building component air tightness detection device comprises an outer box body and a speed reduction cavity arranged in the outer box body, and the speed reduction cavity is provided with an air inlet and an air outlet; on the path of gas flowing from the gas inlet to the gas outlet, a flow dividing part and a flow converging part are arranged in the outer box body, the flow dividing part is arranged towards the gas inlet and used for dispersing gas flow entering from the gas inlet, and the flow converging part is arranged towards the gas outlet and used for discharging the gas flow out of the speed reduction cavity from the gas outlet after the gas flow converges between the flow converging part and the gas outlet. The device can reduce the wind speed acting on the surface of the test piece during the member airtightness test, and reduce the wind speed on the inner surface of the test piece while maintaining the pressure difference between the inner and outer sides of the test piece.

Description

Technical Field

[0001] The invention relates to the technical field of building component detection, and in particular to a building component air tightness detection device. Background Art

[0002] Reducing air leakage through the building envelope is the main technical means to reduce building energy consumption and reduce carbon emissions during the building operation phase. Improving the airtightness of buildings is a key link in achieving the "double carbon" goals in the construction field. Therefore, accurate testing of the airtightness of buildings and their components is the basis for scientific evaluation of airtight products and structures.

[0003] At present, the air tightness test for buildings or their components (such as doors, windows, curtain walls, etc.) mainly uses the booster system to generate a specific pressure difference between the inside and outside of the building or on both sides of the component, and evaluates the air tightness performance of the component by measuring the air leakage under the specific pressure difference. In daily use, the wind speed on the inner surface of the building is relatively low. However, when conducting air tightness tests, it is necessary to generate a large pressure difference on both sides of the component. The booster system will generate a wind speed on the inner surface of the component that is much greater than that under normal use conditions, resulting in a large difference between the experimental results and the normal use of the building, and the test results cannot correctly reflect the actual leakage conditions of the building components. Summary of the invention

[0004] The first aspect of the present invention aims to provide a building component air tightness detection device to solve the technical problem of high wind speed on the surface of the test piece during the existing component air tightness test.

[0005] The first aspect of the present invention provides an air tightness detection device for building components, comprising an outer box body and a deceleration cavity arranged in the outer box body, the deceleration cavity being provided with an air inlet and an air outlet; on the path where the gas flows from the air inlet to the air outlet, a diverter and a confluence are provided in the deceleration cavity, the diverter is arranged toward the air inlet and is used to disperse the airflow entering from the air inlet, and the confluence is arranged toward the air outlet and is used to allow the airflow to converge between the confluence and the air outlet and then be discharged from the deceleration cavity from the air outlet.

[0006] The beneficial effects brought by the air tightness detection device of building components of the present invention are:

[0007] By setting the diversion part and the confluence part, the airflow entering from the air inlet can be diffused first, and then the diffused airflow can be reunited. When the airflows are reunited, the speeds of the reunited airflows in the relative speed directions can be offset, thereby reducing or even eliminating the airflow speed discharged from the air outlet, so that the airflow speed on the inner surface of the test piece of the building component during the air tightness test is closer to the wind speed in actual use conditions, thereby improving the accuracy of the air tightness test.

[0008] In an optional technical solution, a diverter is provided in the deceleration cavity, and the diverter has a first protrusion, and the first protrusion protrudes toward the air inlet.

[0009] In an optional technical solution, the first protrusion is provided with a pointed end portion, and the pointed end portion faces the air inlet.

[0010] In an optional technical solution, the diverter is provided with a tapered portion, and the tip of the tapered portion is the tip portion.

[0011] In an optional technical solution, the diverter has a second protrusion, and the second protrusion protrudes toward the air outlet.

[0012] In an optional technical solution, along the flow direction of the airflow on the second protrusion, the angle between the surface of the second protrusion and the protruding direction of the second protrusion gradually increases.

[0013] In an optional technical solution, the second protrusion is configured so that the airflow flows towards each other on the surface of the second protrusion.

[0014] In an optional technical solution, the deceleration chamber is provided with an outlet wall, the air outlet is arranged on the outlet wall, and the protruding direction of the outlet wall is consistent with the protruding direction of the second protruding portion.

[0015] In an optional technical solution, the deceleration cavity includes an inlet wall, the air inlet is arranged on the inlet wall, and the inlet wall is parallel to the first protrusion.

[0016] In an optional technical solution, the diverter and the deceleration chamber are symmetrically arranged along a line connecting the center of the air inlet to the center of the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background technology, the drawings required for use in the embodiments or the background technology description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a building component air tightness detection device provided by an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of an air tightness detection device for building components provided in another implementation manner in an embodiment of the present invention;

[0020] Figure 3The present invention is a schematic structural diagram of an air tightness detection device for building components provided in another implementation manner in an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 10-Outer box;

[0023] 20-deceleration cavity; 21-air inlet; 22-air outlet; 23-inlet wall; 24-outlet wall; 25-chamfered portion;

[0024] 30-diverter; 31-first protrusion; 32-second protrusion;

[0025] 40-test piece;

[0026] 50-sub-cavity; 51-sub-air inlet. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Embodiment 1:

[0029] Figure 1 A schematic diagram of the structure of a building component air tightness detection device provided by an embodiment of the present invention; Figure 1 As shown, the building component air tightness detection device provided in the first embodiment of the present invention includes an outer box body 10 and a deceleration cavity 20 arranged in the outer box body 10, and the deceleration cavity 20 is provided with an air inlet 21 and an air outlet 22; on the path of the gas flowing from the air inlet 21 to the air outlet 22, a diverter part and a converging part are provided in the deceleration cavity 20, the diverter part is arranged toward the air inlet 21 and is used to disperse the airflow entering from the air inlet 21, and the converging part is arranged toward the air outlet 22 and is used to make the airflow converge between the converging part and the air outlet 22 and then discharge the deceleration cavity 20 from the air outlet 22.

[0030] By providing the diversion part and the confluence part, the airflow entering from the air inlet 21 can be diffused first, and then the diffused airflow can be reunited. When the airflows are reunited, the speeds of the reunited airflows in the relative speed directions can be offset, thereby reducing or even eliminating the airflow speed discharged from the air outlet 22, so that the airflow speed on the inner surface of the test piece of the building component during the air tightness test is closer to the wind speed in actual use conditions, thereby improving the accuracy of the air tightness test.

[0031] Specifically, in this embodiment, the outer box 10 can be, for example, a rectangular cube or a cube, and one side of the outer box 10 facing the wall is open to generate air pressure in the outer box 10 to simulate a specific test condition and test the test piece 40, such as a door, window, curtain wall, etc. The side wall of the outer box 10 opposite to or adjacent to the wall can be provided with an air inlet 21 to install a booster device such as a fan not shown. When the gas is discharged from the air outlet 22 of the deceleration cavity 20, the air pressure in the outer box 10 can be maintained.

[0032] Of course, in this embodiment, a deceleration chamber 20 is set in the outer box 10 for illustration. In fact, a single or multiple deceleration chambers 20 arranged in series can be set according to needs, for example, according to the gas flow rate of the exhaust gas of the boosting equipment and the gas flow rate required on the surface of the test piece 40.

[0033] like Figure 1 As shown, a flow divider 30 is provided in the deceleration cavity 20 . The flow divider 30 has a first protrusion 31 . The first protrusion 31 protrudes toward the air inlet 21 .

[0034] By setting a diverter 30 in the deceleration cavity 20, and setting a first protrusion 31 protruding toward the air inlet 21 on the diverter 30, the first protrusion 31 can be used to timely divert the gas entering the deceleration cavity 20 through the air inlet 21, so that the gas flows along the space between the first protrusion 31 and the deceleration cavity 20, forming a stable airflow, and the dispersed airflows are reunited, thereby ultimately reducing the speed at which the gas is discharged from the deceleration cavity 20.

[0035] In this embodiment, the flow divider 30 and the deceleration chamber 20 can be connected by a fixing member not shown in the figure, and the deceleration chamber 20 can be connected to the outer box 10 by welding or the like. Specifically, a mesh grille that does not affect the gas flow can be provided between the flow divider 30 and the deceleration chamber 20 to fix the flow divider 30.

[0036] Figure 2 FIG. 1 is a schematic diagram of a building component air tightness detection device provided in another implementation mode in an embodiment of the present invention; Figure 2As shown, in another implementation, the diverter 30 may not be provided with a protrusion, and the air inlet 21 and the air outlet 22 may be provided on the same or adjacent sides of the deceleration cavity 20. Taking the case where the air inlet 21 and the air outlet 22 are provided on adjacent sides of the cavity as an example, for example, the air inlet 21 is provided on the upper side of the deceleration cavity 20, and the air outlet 22 is provided on the right side of the deceleration cavity 20 as shown in the figure, the distance between the corresponding parts of the deceleration cavity 20 and the diverter 30 between the air inlet 21 and the air outlet 22 can be changed, that is, the distance between the cavity wall and the diverter 30 in the area to the right of the air inlet 21 and the upper side of the air outlet 22 is reduced, thereby reducing the cross-sectional size of the channel for gas circulation, controlling the flow rate of gas through this part of the flow channel, and increasing the width of the part of the flow channel to the left of the air inlet 21, below the left of the diverter 30, and below the air outlet 22 as shown in the figure. In this way, although some of the flow passages are shorter and some are longer, the resistances of the two are the same due to the different widths of the flow passages, and thus the flow rates are also the same. Therefore, the flow rates of the two air flows can be made roughly the same, so as to offset at least part of the speed and reduce the speed of the gas discharged from the gas outlet 22.

[0037] Figure 3 FIG. 1 is a schematic diagram of a building component air tightness detection device provided in another implementation of the present invention; Figure 3 As shown, in another implementation, a sub-cavity 50 is provided in the outer box 10, and the sub-cavity 50 may be a rectangular cavity, and the sub-cavity 50 has sub-air inlets 51 respectively provided on opposite surfaces, and the test piece 40 is located on the surface between the opposite surfaces. The air inlet 21 of the outer box 10 may face the outside of the other surface between the pair of opposite surfaces. When the air flow enters from the two sub-air inlets 51, the speed may be at least partially offset, thereby achieving the purpose of reducing the gas speed and increasing the gas pressure. The sub-cavity 50 may be the above-mentioned deceleration cavity, and the diversion portion is the side surface of the sub-cavity 50 facing the air inlet 21. The interior of the sub-cavity 50 is the confluence portion, and the air outlet 22 of the deceleration cavity is located on the test piece.

[0038] like Figure 1 As shown, optionally, the first protrusion 31 is provided with a tip portion, and the tip portion faces the air inlet 21 .

[0039] By providing a pointed end portion facing the air inlet 21 on the first protrusion 31, the airflow entering from the air inlet 21 can encounter the diverter 30 as early as possible, thereby minimizing the resistance of the diverter 30 to the airflow entering from the air inlet 21, thereby organizing the gas to be diverted as early as possible before the gas entering from the air inlet 21 diffuses freely, thereby increasing the length of the first protrusion 31 of the diverter 30 and the deceleration cavity 20 to jointly disperse and guide the airflow.

[0040] In other implementations not shown, the first raised portion 31 may not have a pointed end, for example, a spherical crown-shaped, olive-shaped, or teardrop-shaped front portion, which may also serve to disperse the airflow, or the cross-section of the first raised portion 31 may be a cross-sectional edge of the above shape, and the first raised portion 31 may be a solid shape extending in a direction perpendicular to the cross-section.

[0041] like Figure 1 As shown, optionally, the flow divider 30 is provided with a tapered portion, and the tip of the tapered portion is a tip portion.

[0042] By setting the first protrusion 31 of the diverter 30 as a conical portion and using the tip of the conical portion as the tip portion, the airflow can be evenly diffused in equal amounts and at equal speeds in all circumferential directions after encountering the diverter 30, thereby improving the uniformity of the diffused airflow and reducing the airflow velocity at the outlet.

[0043] In this embodiment, the first protrusion 31 may be a tapered portion, and the tapered portion may be a cone in this embodiment. Of course, in another implementation, the tapered portion may also be a polygonal pyramid.

[0044] In another implementation, the first protrusion 31 may be a vertically symmetrical structure rather than an axially symmetrical shape such as a cone, that is, a triangular cube structure formed by extending the structure shown in the figure in a direction perpendicular to the paper surface. Alternatively, the first protrusion 31 may also be in the shape of a bullet head or a jujube pit.

[0045] like Figure 1 As shown, optionally, the flow dividing member 30 has a second protrusion 32 , and the second protrusion 32 protrudes toward the air outlet 22 .

[0046] By providing a second protrusion 32 on the side of the diverter 30 facing the air outlet 22, the airflow can flow along the surface of the second protrusion 32 under the influence of the Coanda effect, so as to reduce the vortex on the side of the diverter 30 facing the air outlet 22, and make the airflow more evenly distributed between the second protrusion 32 and the outlet wall 24.

[0047] Of course, in another implementation, the side of the diverter 30 facing the air outlet 22 may also be a plane, which can also play the role of converging the airflow, but the uniformity of the airflow is not as good as that in the case where the second protrusion 32 is provided.

[0048] like Figure 1 As shown, optionally, along the flow direction of the airflow on the second protrusion 32 , the angle between the surface of the second protrusion 32 and the protruding direction of the second protrusion 32 gradually increases.

[0049] By gradually increasing the angle between the surface of the second protrusion 32 and the protrusion direction, that is, the closer to the center position of the second protrusion 32, the larger the angle between the surface and the protrusion direction, the larger the angle between the converging airflows can be, so that the speed of the airflow itself can be offset, so as to form static pressure at the air outlet as much as possible.

[0050] like Figure 1 As shown, the second protrusion 32 protrudes to the right side in the figure, so the angle between the surface of the second protrusion 32 and the protruding direction of the second protrusion 32 gradually increases, and along the flow direction of the airflow on the second protrusion 32, the angle between the surface of the second protrusion 32 and the protruding direction gradually increases, that is, the surface of the second protrusion 32 is getting closer and closer to the vertical state.

[0051] Of course, in another implementation, for example, the surface of the second protrusion 32 forms the same angle along the airflow direction as the protrusion direction of the second protrusion 32. For example, the angles are both 50° or 20°, and the second protrusion 32 can be conical or triangular prism-shaped, so that the merged airflow can partially offset the airflow speed, so as to reduce the speed discharged from the air outlet 22.

[0052] like Figure 1 As shown, optionally, the second protrusion 32 is configured so that airflows flow toward each other on the surface of the second protrusion 32 .

[0053] By making the airflows flow towards each other on the surface of the second protrusion 32, that is, the directions of the relatively merged airflow velocities are completely opposite, the velocities can be offset as much as possible, thereby significantly reducing the airflow velocity at the air outlet 22 to be as close as possible to the airflow conditions during the airtightness test.

[0054] The relatively converging airflow refers to, for example, the airflow from top to bottom and the airflow from bottom to top, or the airflow from front to back and the airflow from back to front. Obviously, the airflow from top to bottom and the airflow from back to front cannot constitute a relatively converging airflow.

[0055] In this embodiment, the velocity of the oppositely flowing airflows on the surface of the second protrusion 32 when they merge can reduce the horizontal velocity component in the figure as much as possible, so the horizontal velocity component of the airflow after merging can be reduced as much as possible, reducing the wind speed on the inner surface of the specimen.

[0056] like Figure 1 As shown, optionally, the deceleration chamber 20 is provided with an outlet wall 24 , the air outlet 22 is provided on the outlet wall 24 , and the protruding direction of the outlet wall 24 is consistent with the protruding direction of the second protruding portion 32 .

[0057] By providing the outlet wall 24 , the airflow can be restricted from merging toward the center of the second protrusion 32 , thereby reducing the velocity component from the air inlet 21 toward the air outlet 22 , thereby reducing the air outlet velocity from the air outlet 22 .

[0058] Specifically, in this embodiment, the outlet wall 24 may also be a curved surface.

[0059] In this embodiment, the first protrusion 31 and the inlet wall 23 belong to the diverter portion, while the second protrusion 32 and the outlet wall 24 belong to the converging portion.

[0060] like Figure 1 As shown, optionally, the deceleration cavity 20 includes an inlet wall 23 , the air inlet 21 is disposed on the inlet wall 23 , and an air flow channel is formed between the inlet wall 23 and the first protrusion 31 .

[0061] By setting the inlet wall 23 and the first protrusion 31, the space between the first protrusion 31 and the inlet wall 23 can be used to guide the airflow, so that the stability of the airflow in each direction converging at the outlet wall 24 is improved, thereby ultimately reducing the airflow speed after converging at the outlet 22.

[0062] Specifically, in this embodiment, if the first protrusion 31 is conical, the inlet wall 23 may be a truncated cone with the same angle as the first protrusion 31 and coaxially arranged; if the first protrusion 31 is a triangular pyramid, the two planes forming the angle of the inlet wall 23 are parallel to the surface of the triangular pyramid. In addition, a chamfered portion 25 may be provided between the inlet wall 23 and the outlet wall 24 to guide the direction of the airflow, and the chamfered portion 25 is provided corresponding to the intersection of the first protrusion 31 and the second protrusion 32.

[0063] like Figure 1 As shown, optionally, the flow divider 30 and the deceleration chamber 20 are symmetrically arranged along a line connecting the center of the air inlet 21 to the center of the air outlet 22 .

[0064] By arranging the diverter 30 and the deceleration chamber 20 symmetrically along the line connecting the center of the air inlet 21 to the center of the air outlet 22, the airflow dispersed by the diverter 30 can be symmetrical along the line from the center of the air inlet 21 to the center of the air outlet 22, and the airflow converging at the confluence is also symmetrical, thereby achieving the goal that the speeds of the converging airflows can be offset as much as possible to reduce the air outlet speed of the air outlet 22.

[0065] Specifically, in this embodiment, the first protrusion 31 of the flow divider 30 may be conical and the second protrusion 32 may be spherical, while the inlet wall 23 of the deceleration chamber 20 may be truncated cone and the outlet wall 24 may be spherical. That is, the axes of the cone, truncated cone and spherical are coaxially arranged and all point to the center of the air inlet 21 and the center of the air outlet 22. In another implementation, if the flow divider 30 and the deceleration chamber 20 are symmetrical structures, the center of the air inlet 21 and the center of the air outlet 22 are on the symmetry plane.

[0066] The operating principle of this embodiment is:

[0067] like Figure 1 As shown, after the airflow enters from the air inlet 21, it encounters the diverter 30 and is diverted by the first protrusion 31 of the diverter 30, and flows between the inlet wall 23 and the first protrusion 31. After the airflow flows through the chamfered portion 25, it is guided by the second protrusion 32 and the outlet wall 24 to stably flow and merge in the space formed between the second protrusion 32 and the outlet wall 24. Since the inlet wall 23 and the first protrusion 31, the outlet wall 24 and the second protrusion 32 are all coaxially arranged, the airflow is also evenly dispersed, and the merged airflow is also relatively uniform, so that the airflow merged at the center position of the second protrusion 32 is close to the airflow with equal flow velocity and opposite direction, and the kinetic energy of the airflow in each direction will be offset, so as to achieve the reduction of the airflow velocity and the increase of the pressure in the outer cavity 10, so as to form a static pressure on the surface of the test piece 40 as much as possible, which is as close as possible to the actual use state of the test piece 40.

[0068] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

[0069] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0070] In the above embodiments, the descriptions of directions such as “upper” and “lower” are all based on the drawings.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0072] Thus, the present invention will not be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A building component air tightness detection device, characterized in that: The invention comprises an outer box body (10) and a deceleration chamber (20) arranged in the outer box body (10), wherein the deceleration chamber (20) is provided with an air inlet (21) and an air outlet (22); on the path where the gas flows from the air inlet (21) to the air outlet (22), a diverter portion and a converging portion are provided in the deceleration chamber (20), wherein the diverter portion is arranged toward the air inlet (21) and is used to disperse the airflow entering from the air inlet (21), and the converging portion is arranged toward the air outlet (22) and is used to allow the airflow to converge between the converging portion and the air outlet (22) and then be discharged from the deceleration chamber (20) from the air outlet (22).

2. The air tightness detection device for building components according to claim 1, characterized in that: A flow divider (30) is provided in the deceleration cavity (20), wherein the flow divider (30) has a first protrusion (31), and the first protrusion (31) protrudes toward the air inlet (21).

3. The air tightness detection device for building components according to claim 2, characterized in that: The first protrusion (31) is provided with a tip portion, and the tip portion faces the air inlet (21).

4. The air tightness detection device for building components according to claim 3, characterized in that: The flow divider (30) is provided with a tapered portion, and the tip of the tapered portion is the tip portion.

5. The building component air tightness detection device according to any one of claims 2 to 4, characterized in that: The flow dividing member (30) has a second protrusion (32), and the second protrusion (32) protrudes toward the air outlet (22).

6. The air tightness detection device for building components according to claim 5, characterized in that: Along the flow direction of the airflow on the second protrusion (32), the angle between the surface of the second protrusion (32) and the protrusion direction of the second protrusion (32) gradually increases.

7. The air tightness detection device for building components according to claim 6, characterized in that: The second protrusion (32) is configured so that the airflow flows towards each other on the surface of the second protrusion (32).

8. The air tightness detection device for building components according to claim 5, characterized in that: The deceleration chamber (20) is provided with an outlet wall (24), the air outlet (22) is arranged on the outlet wall (24), and the protruding direction of the outlet wall (24) is consistent with the protruding direction of the second protruding portion (32).

9. The air tightness detection device for building components according to any one of claims 2 to 4 or any one of claims 6 to 8, characterized in that: The deceleration chamber (20) comprises an inlet wall (23), the air inlet (21) is arranged on the inlet wall (23), and the inlet wall (23) is parallel to the first protrusion (31).

10. The building component air tightness detection device according to any one of claims 2 to 4 or any one of claims 6 to 8, characterized in that: The flow divider (30) and the deceleration chamber (20) are symmetrically arranged along a line connecting the center of the air inlet (21) to the center of the air outlet (22).

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