Smoke exhaust pipe blockage testing device
By designing a smoke exhaust pipe blockage testing device, and utilizing a cylindrical shell and airflow changing components to adjust the ventilation area, the problem of inaccurate simulation of smoke exhaust pipe blockage in gas equipment was solved, thus achieving both accuracy and safety in the test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- VAILLANT WUXI HEATING EQUIP
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-05
AI Technical Summary
In existing technologies, the simulation of blockage in the exhaust pipes of gas appliances is inaccurate, leading to deviations in test data or operational errors, and making it impossible to ensure the accuracy of test results.
Design a smoke exhaust pipe blockage testing device, including a cylindrical shell, a fixing mechanism, an air volume changing component and a positioning bracket. By adjusting the cross-sectional ventilation area inside the cylindrical shell, various blockage states can be simulated, and accurate sampling data can be obtained through a smoke sampling pipe.
It achieves accurate simulation of the blockage state of the exhaust duct, ensuring the accuracy and safety of the test results and avoiding deviations in test data and operational errors.
Smart Images
Figure CN224202734U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of smoke exhaust testing of gas equipment, and in particular to a testing device that can be used to simulate smoke exhaust pipe blockage. Background Technology
[0002] Gas appliances, such as gas water heaters, gas boilers, and range hoods, typically exhaust fumes outdoors through flue pipes. Taking a gas water heater as an example, it usually contains a burner, heat exchanger, and fan. The fan supplies the air needed for combustion to the burner and exhausts the waste gas through the flue. Gas water heaters usually also have a pressure switch to ensure the fan operates normally and can trigger a gas shut-off in case of poor ventilation, preventing gas leakage and protecting personal safety. When testing gas water heaters, a scenario of poor flue ventilation (i.e., a blocked flue) is usually simulated to obtain the extreme flue gas value at the flameout point. Currently, this is typically achieved by attaching cut aluminum foil to the flue outlet. However, because the method of blocking the flue and the size of the cut aluminum foil vary from person to person, test data can be inaccurate, or operational errors can lead to sudden flameout, compromising the accuracy of the test. The applicant's earlier patent application, CN218444396U, disclosed a flue blockage testing device that uses the movement of blades to simulate the degree of blockage in the exhaust pipe. However, due to structural limitations imposed by the blade movement, this device cannot simulate a completely blocked state. Utility Model Content
[0003] The purpose of this invention is to provide a smoke exhaust pipe blockage testing device that can simulate various blockage states of smoke exhaust pipes, thereby ensuring the accuracy of the test results.
[0004] To achieve the above objectives, this utility model provides a smoke exhaust pipe blockage testing device, suitable for installation on a smoke exhaust duct to change the smoke exhaust volume of the duct. The testing device includes a cylindrical shell, a fixing mechanism disposed on the cylindrical shell for fixing the testing device to the smoke exhaust duct, and an airflow changing component disposed within the cylindrical shell. The airflow changing component includes a drive mechanism that partially extends out of the cylindrical shell and is circumferentially movable, and several blades cooperating with the drive mechanism. The drive mechanism can be operated to drive the blades to move, thereby changing the cross-sectional ventilation area within the cylindrical shell. The testing device also includes a positioning bracket fixed relative to the cylindrical shell and extending through the axis of the cylindrical shell, and a sealing member disposed on the positioning bracket and extending along the axis of the cylindrical shell to contact the blades.
[0005] In some embodiments, the positioning bracket includes at least one positioning rod extending radially.
[0006] In some embodiments, at least one of the positioning rods is provided with a through hole at the axial position of the cylindrical housing, and the sealing member extends through the through hole.
[0007] In some embodiments, the positioning bracket includes a plurality of positioning rods distributed at equal angular intervals, the plurality of positioning rods converging at the axial position of the cylindrical shell, and a sealing member is fixedly disposed at the converging point of the plurality of positioning rods.
[0008] In some embodiments, the testing apparatus further includes a flue gas sampling tube extending radially through the cylindrical shell, the flue gas sampling tube having a connecting portion located outside the cylindrical shell and a sampling portion located inside the cylindrical shell, the sampling portion having a plurality of sampling holes distributed radially.
[0009] In some embodiments, the distance between at least two adjacent sampling holes in the plurality of sampling holes is 1 / 6 of the inner diameter of the cylindrical shell.
[0010] In some embodiments, the aperture of each of the sampling holes is 1 mm.
[0011] In some embodiments, the testing apparatus further includes a pair of annular limiting blocks disposed within a cylindrical housing, wherein the pair of annular limiting blocks axially clamp the airflow changing component therebetween; the positioning bracket is fixedly mounted on one of the annular limiting blocks.
[0012] In some embodiments, the airflow changing assembly further includes an annular base disposed within a cylindrical housing; the drive mechanism includes a lever extending out of the cylindrical housing and an annular dial housed within the annular base, wherein the lever passes through the annular base and is fixedly connected to the annular dial to drive the annular dial to rotate. Each blade has a fixed protrusion fixedly engaged with the annular base and a movable protrusion movably engaged with the annular dial; the fixed protrusion and the movable protrusion are distributed on mutually opposite sides of each blade. The annular base has a first base plate, the first base plate including a plurality of receiving holes defined thereon in a circumferential direction for correspondingly housing a plurality of fixed protrusions of a plurality of blades, and a first ventilation hole defined therein. The annular dial has a second base plate, the second base plate including a plurality of grooves defined thereon in a circumferential direction and extending radially for correspondingly housing a plurality of movable protrusions of a plurality of blades, and a second ventilation hole defined therein. Several blades are disposed between the first base plate and the second base plate; during the process of the lever driving the annular dial to rotate, the movable protrusions of several blades slide in the corresponding grooves, and thus cause several blades to rotate together around their respective fixed protrusions, thereby changing the ventilation area of the first ventilation hole and the second ventilation hole.
[0013] In some embodiments, the fixing mechanism includes a threaded hole disposed on the circumferential sidewall of the cylindrical housing and a threaded post that passes radially through the threaded hole to abut against the exhaust duct.
[0014] Compared with the prior art, the exhaust pipe blockage testing device in the above embodiments, by setting a positioning bracket and a sealing component on the cylindrical shell, can not only finely adjust the cross-sectional ventilation area inside the cylindrical shell, but also simulate various blockage states, including complete enclosure. In addition, in some embodiments, by setting several spaced sampling holes on the sampling pipe for flue gas, more accurate sampling data can be obtained, thereby further ensuring the accuracy of the final test results. 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 description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings related to this utility model 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 schematic diagram of the connection between the exhaust pipe blockage testing device of this utility model and the exhaust pipe and gas equipment in a specific embodiment;
[0017] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the exhaust pipe blockage testing device shown in the figure;
[0018] Figure 3 yes Figure 2 An exploded perspective view of the exhaust pipe blockage test device shown.
[0019] Figure 4 yes Figure 3 An exploded 3D view of the airflow change component of the exhaust pipe blockage test device shown.
[0020] Figure 5 This is a plan view of the airflow changing component when the ventilation volume is at its maximum.
[0021] Figure 6 This is a plan view of the airflow changing component when the ventilation volume is at its minimum.
[0022] Figure 7 This is a three-dimensional schematic diagram of another specific embodiment of the exhaust pipe blockage testing device of this utility model;
[0023] Figure 8 yes Figure 7 A three-dimensional schematic diagram of the exhaust pipe blockage test device from another perspective;
[0024] Figure 9 yes Figure 7 The diagram shows a partial exploded view of the exhaust pipe blockage testing device.
[0025] Figure 10 yes Figure 8 The diagram shows a front view of the exhaust pipe blockage test device. Detailed Implementation
[0026] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.
[0027] like Figure 1 The test system shown typically involves installing the exhaust pipe blockage test device 1 at the end of the exhaust pipe 2, which is connected to the gas appliance 3, such as a gas water heater, via the exhaust pipe 2. When the gas appliance 3 is operating, the generated flue gas is discharged through the exhaust pipe 2. At this time, the exhaust pipe blockage test device located at the exhaust pipe outlet can simulate the degree of blockage in the exhaust pipe by adjusting the ventilation volume, and ultimately measure the limit flue gas value when the flame is extinguished.
[0028] Reference Figures 2 to 4 As shown, the exhaust pipe blockage testing device 1 includes a cylindrical housing 20. The cylindrical housing 20 has a fixing mechanism near one of its axial ends for fixing the testing device 1 to the exhaust pipe 2. In some embodiments, the fixing mechanism includes a threaded hole 22 disposed on the circumferential sidewall of the cylindrical housing 20, and a threaded post 50 that can pass radially through the threaded hole 22 to abut and fix the exhaust pipe. The number of threaded posts 50 and corresponding threaded holes 22 can be one or more pairs; in this embodiment, the number of threaded posts 50 and corresponding threaded holes 22 is three pairs, evenly distributed along the circumferential sidewall of the cylindrical housing 20.
[0029] The cylindrical housing 20 has an airflow changing component 10 located near its other axial end. In some embodiments, a pair of annular limiting blocks 41, 42 are disposed within the cylindrical housing 20 and axially clamp the airflow changing component 10 therebetween. (See reference) Figure 4As shown, along the axial direction, the airflow changing assembly 10 includes an annular base 11 fixedly disposed within the cylindrical housing 20, a drive mechanism, and a plurality of arc-shaped blades 13. In some embodiments, the drive mechanism includes a lever 12 and an annular dial 14 fixedly connected to the lever. The annular dial 14 is housed within the annular base 11, and the plurality of blades 13 are disposed between the annular base 11 and the annular dial 14. In some embodiments, a threaded hole is recessed on the circumferential sidewall of the annular dial 14, and the end of the lever 12 is provided with an external thread, thereby allowing the lever 12 to be fixedly installed onto the annular dial 14 from the outside of the cylindrical housing 20 through a threaded connection. The annular base 11 has a first slot 111 on its circumferential sidewall, and the cylindrical housing 20 has a second slot 21 on its circumferential sidewall corresponding to the first slot 111. Thus, the lever 12 extends through the first slot 111 and the second slot 21 and protrudes from the outside of the cylindrical housing 20. The tester can then move the lever 12 circumferentially along with the annular dial 14 by turning it. In some embodiments, the exhaust pipe blockage testing device 1 further includes an indicator 30 located on the circumferential sidewall of the cylindrical housing 20 and near the protruding lever 12. The indicator 30 is arc-shaped and has markings on its surface facing the lever 12 to characterize the ventilation volume, such as scale lines and corresponding numerical markings. The tester can then adjust the lever 12 accordingly to precisely control the ventilation volume of the exhaust pipe blockage testing device 1, thereby accurately simulating the degree of blockage in the exhaust pipe.
[0030] In some embodiments, the plurality of blades 13 are identical in shape, each blade 13 extending in an arc shape, having a fixed protrusion 131 fixedly engaged with the annular base 11 and a movable protrusion 132 movably engaged with the annular dial 14. The fixed protrusion 131 and the movable protrusion 132 are distributed on opposite sides of each blade 13. The annular base 11 has a first base plate, which is annularly arranged, having a plurality of receiving holes 112 distributed circumferentially to receive the fixed protrusions 131 of the plurality of blades 13, and a first ventilation hole 113 defined in the center of the first base plate. The annular dial 14 has a second base plate, which is annularly arranged, having a plurality of grooves 141 distributed circumferentially and extending radially to receive the movable protrusions 132 of the plurality of blades 13, and a second ventilation hole 142 defined in the center of the second base plate. The airflow changing assembly 10 also includes a retaining ring 15. The retaining ring 15 is engaged in the corresponding groove of the annular base 11 and abuts against the axial side of the annular dial 14, thereby reliably housing the annular dial 14 in the annular base 11. In the above embodiment, the annular base 11 is separable from the cylindrical housing 20. In other embodiments, the annular base 11 may also be integrally disposed within the cylindrical housing 20.
[0031] Reference Figure 5 and Figure 6 As shown, during the rotation of the annular dial 14 driven by the lever 12, the movable protrusions 132 of several blades 13 slide within the corresponding grooves 141 of the annular dial 14. Simultaneously, the blades 13 rotate together around their respective fixed protrusions 131, thereby changing the ventilation area of the first ventilation hole 113 and the second ventilation hole 142, and consequently changing the cross-sectional ventilation area within the cylindrical housing 20 to accurately simulate the degree of blockage within the exhaust duct 2. The exhaust duct blockage testing device 1 also includes a flue gas sampling pipe 60 extending through the cylindrical housing 20, with its two ends located inside and outside the cylindrical housing 20 respectively, to obtain flue gas values. Figure 6 As shown, when the blade 13 moves to its limit position, the ventilation hole cannot be completely blocked, and small holes 1131 are still left.
[0032] like Figures 7 to 9 Another specific embodiment of the testing apparatus is shown, the main difference from the above embodiment being that the testing apparatus further includes a positioning bracket 70 fixedly disposed relative to the cylindrical housing 20 and extending through the axis (i.e., the axis) of the cylindrical housing, and a sealing member 71 disposed on the positioning bracket and extending along the axis of the cylindrical housing to contact a plurality of blades. The positioning bracket includes at least one positioning rod extending radially, the positioning rod having a through hole at the axis of the cylindrical housing 20, allowing the sealing member 71 to extend through the through hole. In some embodiments, the positioning bracket 70 includes a plurality of positioning rods distributed at equal angular intervals; for example, the positioning bracket 70 may include three positioning rods spaced 120° apart. In some embodiments, the positioning rods may be fixedly mounted (e.g., by screws) on the annular limiting block 41, the plurality of positioning rods converging at the axis of the cylindrical housing 20, the convergence forming a through hole, and the sealing member 71 fixedly disposed at the convergence. Figure 6 As shown, the sealing element 71 may include a screw and a column 711 sleeved on the screw. The screw passes through the through hole at the aforementioned junction, and the column 711 may have internal threads, thereby being fixed to the screw on the other side. The cross-sectional diameter of the column 711 may be the same as or slightly larger than the diameter of the aforementioned small hole 1131, so that it can pass through the small hole 1131 and contact each blade when the blade has moved to its limit position or has not yet reached its limit position, thereby completely sealing the ventilation hole.
[0033] Reference Figure 9 and Figure 10As shown, the flue gas sampling tube 65 in this embodiment includes a connecting portion 651 located outside the cylindrical shell 20 and a sampling portion 652 located inside the cylindrical shell 20. The sampling portion 652 has a plurality of sampling holes 6521 distributed radially at intervals. In some embodiments, the distance between at least two adjacent sampling holes is 1 / 6 of the inner diameter of the cylindrical shell. For example, the number of sampling holes can be three or four, where the distance between two adjacent sampling holes 6521 is 1 / 6 of the inner diameter of the cylindrical shell, or the distance between any two adjacent sampling holes 6521 is 1 / 6 of the inner diameter of the cylindrical shell. In other embodiments, the diameter of each sampling hole 6521 is the same, such as 1 mm.
[0034] By setting positioning brackets and sealing components on the cylindrical shell, not only can the cross-sectional ventilation area inside the cylindrical shell be precisely adjusted, but also various blockage states, including complete enclosure, can be simulated. In addition, in some embodiments, by setting several spaced sampling holes on the sampling tube for flue gas, more accurate sampling data can be obtained, thereby further ensuring the accuracy of the final detection results.
[0035] In the description of the above embodiments in this disclosure, the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "axial", "radial", "circumferential", "horizontal", "vertical", "clockwise", "counterclockwise", "length", "width", "thickness", "up", "down", "left", "right", "front", and "rear" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model.
[0036] In the foregoing description, terms such as "several," "multiple," etc., mean at least two, such as two, three, etc., unless otherwise explicitly specified. In the foregoing disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, the designation "first," "second," etc., can explicitly or implicitly include at least one of those features. In the foregoing description, terms such as "several," "multiple," etc., mean at least two, such as two, three, etc., unless otherwise explicitly specified.
[0037] In the above disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0038] In the above disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0039] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard 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. A smoke exhaust pipe blockage testing device, suitable for installation on a smoke exhaust pipe to change the smoke exhaust volume of the smoke exhaust pipe, characterized in that: The testing device includes a cylindrical shell, a fixing mechanism disposed on the cylindrical shell for fixing the testing device to a smoke exhaust duct, and an airflow changing component disposed within the cylindrical shell. The airflow changing component includes a drive mechanism that partially extends out of the cylindrical shell and is movable circumferentially, and a plurality of blades that cooperate with the drive mechanism. The drive mechanism can be operated to drive the plurality of blades to move to change the cross-sectional ventilation area within the cylindrical shell. The testing device also includes a positioning bracket that is fixed relative to the cylindrical shell and extends through the axis of the cylindrical shell, and a sealing member disposed on the positioning bracket and extending along the axis of the cylindrical shell to contact the plurality of blades.
2. The exhaust pipe blockage testing device according to claim 1, characterized in that: The positioning bracket includes at least one positioning rod extending radially.
3. The exhaust pipe blockage testing device according to claim 2, characterized in that: The at least one positioning rod has a through hole at the axial position of the cylindrical shell, and the sealing member extends through the through hole.
4. The exhaust pipe blockage testing device according to claim 2, characterized in that: The positioning bracket includes a plurality of positioning rods distributed at equal angular intervals, the plurality of positioning rods converging at the axial position of the cylindrical shell, and the sealing member is fixedly disposed at the converging point of the plurality of positioning rods.
5. The exhaust pipe blockage testing device according to claim 1, characterized in that: The testing device also includes a flue gas sampling tube extending radially through the cylindrical shell. The flue gas sampling tube has a connecting part located outside the cylindrical shell and a sampling part located inside the cylindrical shell. The sampling part is provided with a plurality of sampling holes distributed radially.
6. The exhaust pipe blockage testing device according to claim 5, characterized in that: The distance between at least two adjacent sampling holes is 1 / 6 of the inner diameter of the cylindrical shell.
7. The exhaust pipe blockage testing device according to claim 5 or 6, characterized in that: The diameter of each of the sampling holes is 1 mm.
8. The exhaust pipe blockage testing device according to claim 1, characterized in that: The testing device also includes a pair of annular limiting blocks disposed inside the cylindrical housing, which clamp the air volume changing component therebetween in the axial direction; the aforementioned positioning bracket is fixedly installed on one of the annular limiting blocks.
9. The exhaust pipe blockage testing device according to claim 1, characterized in that: The airflow changing component further includes an annular base disposed within a cylindrical housing; the driving mechanism includes a lever extending out of the cylindrical housing and an annular dial housed within the annular base, wherein the lever passes through the annular base and is fixedly connected to the annular dial to drive the annular dial to rotate; each blade has a fixed protrusion fixedly engaged with the annular base and a movable protrusion movably engaged with the annular dial; the fixed protrusion and the movable protrusion are distributed on two opposing sides of each blade; the annular base has a first base plate, the first base plate including circumferentially distributed members defined thereon for correspondingly housing a plurality of blades. The annular dial has a plurality of receiving holes for fixed protrusions and a first ventilation hole defined therein; the annular dial has a second base plate, the second base plate including a plurality of grooves defined thereon for correspondingly receiving movable protrusions of a plurality of blades distributed in the circumferential direction and extending radially, and a second ventilation hole defined therein; the plurality of blades are disposed between the first base plate and the second base plate; during the process of the lever driving the annular dial to rotate, the movable protrusions of the plurality of blades slide in the corresponding grooves, and thereby cause the plurality of blades to rotate together around their respective fixed protrusions, thereby changing the ventilation area of the first ventilation hole and the second ventilation hole.
10. The exhaust pipe blockage testing device according to claim 1, characterized in that: The fixing mechanism includes a threaded hole provided on the circumferential sidewall of the cylindrical shell, and a threaded post that passes radially through the threaded hole to abut against the exhaust pipe.