Fan pressure-taking device

Abstract

The present invention provides a fan pressure-taking device, belonging to the technical field of wind pressure detection for gas water heaters. The fan pressure-taking device comprises a first tube, a second tube, a first mounting plate, and a throat portion. The second tube comprises a contraction portion and a diffusion portion, the contraction portion and the diffusion portion being coaxial and respectively fixed to opposite sides of one end of the first tube, with a gap between the contraction portion and the diffusion portion. One end of the first mounting plate is fixed to one end of the diffusion portion, and the center of the throat portion is rotatably mounted on the first mounting plate. The edge of the throat portion is provided with a plurality of annular portions arranged in an annular pattern and having different diameters, and ventilation holes are opened in the radial direction of the annular portions. When the annular portions are located in the gap, the annular portions, the contraction portion, and the diffusion portion together form a Venturi tube, and the ventilation holes are connected to the first tube.

Description

Technical Field

[0001] The present invention relates to the technical field of wind pressure detection of gas water heaters, and in particular to a fan pressure taking device. Background Art

[0002] The wind pressure of a gas water heater or a gas wall-mounted boiler is detected by using a fan pressure device to pick up the wind pressure. The wind pressure sensor is connected to the fan pressure device to detect the wind pressure data. Generally, all AC fans are equipped with the same pressure device; or different fan pressure devices are installed. If different fan pressure devices are installed, the fan manufacturer will prepare many pressure devices with different diameter pipes, which increases the cost. All fans are equipped with the same fan pressure device, and the pressure differences of fans of different models are different. In order to ensure that different complete machines meet the national standard for smoke and flue gas blocking, the machine should play a protective role. Therefore, different models need to be installed with wind pressure switches of different wind pressure values, resulting in the manufacturer of the complete machine having many kinds of wind pressure switches, which brings troubles to the production of the complete machine and even uses the wrong wind pressure switch. In order to make the pressure values of different fans consistent, the fan manufacturer can install different fan pressure devices. The fan manufacturer will have many kinds of fan pressure devices, which causes troubles to the production of the complete machine and even uses the wrong fan pressure device. Summary of the Invention

[0003] The object of the present invention is to provide a fan pressure-taking device, which includes multiple annular parts with different calibers, and the annular parts, contraction parts and diffusion parts together form a Venturi tube connected to the first tube. When different fan air volumes are required to produce the same pressure difference value, it is only necessary to coaxially align the annular parts with the contraction parts and diffusion parts with the corresponding calibers. The operation is simple and quick, and there is no need to prepare many pressure-taking devices with throats of different calibers, and there is no need to prepare wind pressure switches with different wind pressure values. The same pressure difference can be obtained by using variable-diameter throat pipes to produce fans with different air volumes; gas wall-mounted boilers using fans with different air volumes only need to use the same wind pressure switch; the universality of the fan Venturi tube and the universality of the gas wall-mounted boiler wind pressure switch are realized, thereby achieving the effect of reducing costs and improving work efficiency.

[0004] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0005] According to one aspect of the present invention, a fan pressure-taking device is provided, comprising a first tube, a second tube, a first mounting plate and a throat portion, the second tube comprising a contraction portion and a diffusion portion, the contraction portion and the diffusion portion being coaxial and respectively fixed to both sides of one end of the first tube, with a gap between the contraction portion and the diffusion portion, one end of the first mounting plate being fixed to one end of the diffusion portion, the center of the throat portion being rotatably mounted on the first mounting plate, a plurality of annular portions arranged in an annular manner and of different diameters being provided on the edge of the throat portion, a ventilation hole being radially opened on the annular portion, and when the annular portion is located at the gap, the annular portion, the contraction portion and the diffusion portion together form a Venturi tube, and the ventilation hole is connected to the first tube.

[0006] According to one embodiment of the present invention, it also includes a fixing bolt, a through hole is opened in the throat portion corresponding to the annular portion, and a threaded hole is opened in the first mounting plate corresponding to the gap. When the annular portion is located in the gap, one end of the fixing bolt passes through the through hole and is fixedly connected to the threaded hole to fix the position of the annular portion.

[0007] According to an embodiment of the present invention, a mounting hole is provided at the center of the throat portion, and the first mounting plate is provided with a mounting shaft for mounting the throat portion.

[0008] According to an embodiment of the present invention, the throat portion is provided with eight annular portions, and the number of the through holes is correspondingly eight.

[0009] According to an embodiment of the present invention, the diameters of the eight annular portions gradually decrease in a clockwise direction.

[0010] According to an embodiment of the present invention, the diameters of the eight annular portions gradually expand in a clockwise direction.

[0011] According to one embodiment of the present invention, the device further includes a second mounting plate, and the first tube is passed through the second mounting plate and fixedly connected to the second mounting plate.

[0012] According to an embodiment of the present invention, the device further comprises a first wind pressure switch, and the first wind pressure switch is connected to the air outlet of the first pipe.

[0013] According to one embodiment of the present invention, the third tube is further included. The third tube is passed through the second mounting plate and fixed to the second mounting plate. An air inlet hole is formed on a side wall of one end of the third tube.

[0014] According to one embodiment of the present invention, the device further comprises a second wind pressure switch, which is connected to the air outlet at the other end of the third tube.

[0015] An embodiment of the present invention has the following advantages or beneficial effects:

[0016] A fan pressure-taking device of the present invention places a part of the fan pressure-taking device in the air outlet section of the fan, connects the wind pressure switch with the other end of the first tube located outside the fan, so that the wind pressure switch detects the wind pressure at the throat of the Venturi tube through the first tube and the ventilation hole. When different fan air volumes are required to produce the same pressure difference value, it is only necessary to rotate the annular part of the corresponding caliber to the gap. The operation is simple and quick, and there is no need to prepare a lot of pressure-taking devices with throats of different calibers. The same pressure difference can be obtained by using the variable diameter throat pipe aperture to produce fans with different air volumes; gas wall-mounted boilers using fans with different air volumes only need to use the same wind pressure switch; the universality of the fan Venturi tube and the universality of the gas wall-mounted boiler wind pressure switch are realized, thereby achieving the effect of reducing costs and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features and advantages of the present invention will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0018] Figure 1 FIG1 is a perspective view of a pressure taking device for a wind turbine according to an exemplary embodiment.

[0019] Figure 2 FIG. 1 is a side view of a pressure taking device for a wind turbine according to an exemplary embodiment.

[0020] Figure 3 1 is a disassembled diagram of a fan pressure taking device according to an exemplary embodiment.

[0021] Figure 4 FIG1 is a perspective view of a second pipe of a fan pressure taking device according to an exemplary embodiment.

[0022] The description of the accompanying drawings is as follows:

[0023] 1. First tube; 2. Second tube; 21. Contraction portion; 211. Gap; 22. Diffuser; 3. First mounting plate; 31. Threaded hole; 32. Mounting shaft; 4. Throat portion; 41. Ring portion; 411. Ventilation hole; 42. Through hole; 5. Fixing bolt; 6. Second mounting plate; 7. Third tube; 71. Air inlet. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as 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 concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0025] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0026] like Figures 1 to 4 As shown, a fan pressure taking device according to an embodiment of the present invention includes a first pipe 1, a second pipe 2, a first mounting plate 3 and a throat portion 4.

[0027] The second tube 2 includes a contraction portion 21 and a diffusion portion 22 . The contraction portion 21 and the diffusion portion 22 are coaxial and respectively fixed to both sides of one end of the first tube 1 . A gap 211 is formed between the contraction portion 21 and the diffusion portion 22 . The gap 211 corresponds to the air inlet of the first tube 1 .

[0028] One end of the first mounting plate 3 is fixedly connected to one end of the diffuser 22 close to the contraction portion 21 , and the first mounting plate 3 is perpendicular to the axial direction of the diffuser 22 .

[0029] The center of the throat portion 4 is rotatably mounted on the first mounting plate 3 , and the edge of the throat portion 4 is provided with a plurality of annular portions 41 arranged in an annular pattern and having different diameters.

[0030] A ventilation hole 411 is radially opened in the annular portion 41 . When one of the annular portions 41 moves to the gap 211 , the annular portion 41 , the contraction portion 21 and the diffusion portion 22 together form a Venturi tube, and the ventilation hole 411 is connected to the first tube 1 .

[0031] Place a part of the fan pressure taking device in the air outlet section of the fan, and connect the wind pressure switch to the other end of the first tube 1 located outside the fan, so that the wind pressure switch can detect the wind pressure at the throat of the Venturi tube through the first tube 1 and the ventilation hole 411.

[0032] When different fan air volumes are required to produce the same pressure difference, it is only necessary to rotate the annular portion 41 of the corresponding caliber to the gap 211. The operation is simple and quick, and there is no need to prepare many pressure-taking devices for throats of different calibers. The same pressure difference can be obtained by using variable-diameter throats for producing fans with different air volumes; gas wall-mounted boilers using fans with different air volumes only need to use the same air pressure switch; the versatility of the fan Venturi tube and the versatility of the gas wall-mounted boiler air pressure switch are achieved, thereby reducing costs and improving work efficiency.

[0033] For example, if the diameter of the air outlet pipe is Ø60mm, the inlet of the Venturi tube faces the air outlet, and the two pressure ports are outside the fan and connected to the air pressure switch.

[0034] 1. According to the above technical solution: the pressure difference of the Venturi tube is ΔP=P1-P2=(V2 2 - V12 ) γ / 2 g, γ and g are constants. To make the value of ΔP=P1-P2 constant, it is necessary to change V2 2 -V1 2 is a fixed value;

[0035] 2. Since the air volume through the Venturi tube remains unchanged, Q1=Q2 V1*S1=V2*S2;V2 2 - V1 2 = V1 2 (S1 2 / S2 2 -1), because in the above scheme, the inlet area S1 of the Venturi tube remains unchanged, so V2 2 - V1 2 = V1 2 (S1 2 / S2 2 -1) remains unchanged, that is, V1 2 (S1 2 / S2 2 -1)=C; This formula must be a constant value, and the only variables are V1 S2. When the fan air volume changes (i.e., the wind speed changes), by rotating the appropriate variable throat aperture, that is, selecting the appropriate area S2, V2 can be adjusted. 2 -V1 2 =V1 2 (S1 2 / S2 2 -1) remains unchanged, that is, the pressure difference value of the Venturi tube remains unchanged,

[0036] 3. When the pressure difference of the Venturi tube remains unchanged, the corresponding wind pressure switch selection value is the fixed value.

[0037] That is, fans with different air volumes can select air pressure switches with the same pressure value;

[0038] 4. Through the above technical solution, the same pressure difference can be achieved by using variable-diameter throat pipes when producing fans with different air volumes; gas wall-mounted boilers using fans with different air volumes only need to use the same air pressure switch; the versatility of the fan Venturi tube and the versatility of the gas wall-mounted boiler air pressure switch are achieved.

[0039] According to V12 (S12 / S22-1) = fixed value, the calculation is as follows:

[0040] The fan power is 30W, the wind speed is 10m / s, the S1 cross-sectional diameter is 13mm, and the S2 throat cross-sectional diameter is Ø5.8mm.

[0041] The fan power is 38W, the wind speed is 12m / s, the S1 cross-sectional diameter is 13mm, and the S2 throat cross-sectional diameter is Ø6.5mm.

[0042] The fan power is 45W, the wind speed is 14m / s, the S1 cross-sectional diameter is 13mm, and the S2 throat cross-sectional diameter is Ø7mm.

[0043] The fan power is 53W, the wind speed is 16m / s, the S1 cross-sectional diameter is 13mm, and the S2 throat cross-sectional diameter is Ø8mm.

[0044] like Figures 1 to 4 As shown, in a preferred embodiment of the present invention, a fixing bolt 5 is further included, a through hole 42 is opened in the throat portion 4 corresponding to the annular portion 41, and a threaded hole 31 is opened in the first mounting plate 3 corresponding to the gap 211. When the annular portion 41 is located at the gap 211, one end of the fixing bolt 5 passes through the through hole 42 and is fixedly connected to the threaded hole to fix the position of the annular portion 41 and prevent the annular portion 41 from moving and misaligning.

[0045] like Figures 1 to 4 As shown, in a preferred embodiment of the present invention, a mounting hole is provided at the center of the throat portion 4 , and the first mounting plate 3 is provided with a mounting shaft 32 for mounting the throat portion 4 .

[0046] like Figures 1 to 4 As shown, the mounting shaft 32 can be directly inserted into the mounting hole, or the mounting shaft 32 can be installed by interference fit between the bearing and the mounting hole. Those skilled in the art can select a specific installation method according to actual needs.

[0047] like Figures 1 to 4 As shown, in a preferred embodiment of the present invention, the throat portion 4 is provided with eight annular portions 41 , which are radially arranged to ensure smooth air flow, and the number of the through holes 42 is correspondingly eight.

[0048] like Figures 1 to 4 As shown, in a preferred embodiment of the present invention, the diameters of the eight annular portions 41 gradually decrease in the clockwise direction. Of course, the arrangement is not limited to the eight annular portions 41 gradually decreasing in the clockwise direction; the diameters of the eight annular portions 41 may also gradually increase in the clockwise direction. Those skilled in the art may select an arrangement of unequal diameters according to actual needs.

[0049] like Figures 1 to 4 As shown, in a preferred embodiment of the present invention, a second mounting plate 6 is further included, the first tube 1 is passed through the second mounting plate 6 and fixed to the second mounting plate 6, and the second mounting plate 6 is used to be fixed to the fan casing to fix the fan pressure device on the fan.

[0050] In a preferred embodiment of the present invention, a first wind pressure switch is further included. The first wind pressure switch is connected to the air outlet of the first pipe 1 to detect the wind pressure flowing through the venturi tube.

[0051] like Figures 1 to 4As shown, in a preferred embodiment of the present invention, a third tube 7 is further included. The third tube 7 is passed through the second mounting plate 6 and fixed to the second mounting plate 6. An air inlet hole 71 is provided on the side wall of one end of the third tube 7. The air outlet in the fan enters the third tube 7 through the air inlet hole 71 to generate a pressure change in the third tube 7 for detection by the wind pressure switch.

[0052] In a preferred embodiment of the present invention, a second wind pressure switch is further included, which is connected to the other end of the third tube 7 to detect the wind pressure in the third tube 7.

[0053] In the embodiments of the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meanings of these terms in the embodiments of the present invention based on specific circumstances.

[0054] In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0055] Throughout this specification, terms such as "one embodiment" and "a preferred embodiment" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0056] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible in the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A fan pressure taking device, characterized in that: include: First tube (1), The second tube (2) comprises a contraction portion (21) and a diffusion portion (22), wherein the contraction portion (21) and the diffusion portion (22) are coaxial and respectively fixed to two sides of one end of the first tube (1), and a gap (211) is formed between the contraction portion (21) and the diffusion portion (22). a first mounting plate (3), one end of the first mounting plate (3) being fixedly connected to one end of the diffusion portion (22), and a throat portion (4), the center of the throat portion (4) being rotatably mounted on the first mounting plate (3); a plurality of annular portions (41) arranged in an annular pattern and having different diameters being provided on the edge of the throat portion (4); a ventilation hole (411) being radially opened on the annular portion (41); when the annular portion (41) is located at the gap (211), the annular portion (41), the contraction portion (21) and the diffusion portion (22) together form a Venturi tube, and the ventilation hole (411) is communicated with the first tube (1); It also includes a fixing bolt (5), the throat portion (4) is provided with a through hole (42) corresponding to the annular portion (41), and the first mounting plate (3) is provided with a threaded hole (31) corresponding to the gap (211), and when the annular portion (41) is located at the gap (211), one end of the fixing bolt (5) passes through the through hole (42) and is fixedly connected to the threaded hole (31) to fix the position of the annular portion (41); A mounting hole is provided at the center of the throat portion (4), and the first mounting plate (3) is provided with a mounting shaft (32) for mounting the throat portion (4); It also includes a first wind pressure switch, which is connected to the air outlet of the first tube (1).

2. The fan pressure taking device according to claim 1, characterized in that: The throat portion (4) is provided with eight annular portions (41), the eight annular portions (41) are arranged radially, and the number of the through holes (42) is correspondingly eight.

3. The fan pressure taking device according to claim 2, characterized in that: The diameters of the eight annular portions (41) gradually decrease in the clockwise direction.

4. The fan pressure taking device according to claim 2, characterized in that: The diameters of the eight annular portions (41) gradually expand in the clockwise direction.

5. The fan pressure taking device according to any one of claims 1 to 4, characterized in that: It also includes a second mounting plate (6), and the first tube (1) is passed through the second mounting plate (6) and fixedly connected to the second mounting plate (6).

6. The fan pressure taking device according to claim 1, characterized in that: It also includes a third tube (7), which is passed through the second mounting plate (6) and fixed to the second mounting plate (6), and an air inlet hole (71) is provided on a side wall of one end of the third tube (7).

7. The fan pressure taking device according to claim 6, characterized in that: It also includes a second wind pressure switch, which is connected to the other end of the third tube (7).

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