EC gas fan

Abstract

The utility model relates to the technical field of EC gas fans, in particular to an EC gas fan. Comprising an EC gas fan body and a first mounting plate, a ventilation pipeline body is fixedly mounted in the EC gas fan body, and a third connecting plate is fixedly mounted on the rear side of the EC gas fan body; a first clamping assembly is fixedly mounted on the front side of the first mounting plate, a mounting assembly is fixedly mounted on the front side of the first mounting plate, a second clamping assembly is fixedly mounted on the rear side of the third connecting plate, a first limiting assembly is slidably mounted on the front side of the first mounting plate, and a first positioning assembly is fixedly mounted on the front side of the first mounting plate; a second limiting assembly is movably installed in the ventilation pipeline body, a supporting assembly is fixedly installed on the front side of the third connecting plate, and a second positioning assembly is fixedly installed on the front side of the third connecting plate. The technical problems that maintenance is inconvenient and the using effect is poor are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of EC gas blowers, in particular to an EC gas blower. Background Art

[0002] EC fan refers to a centrifugal fan with a built-in intelligent control module and a digital brushless DC outer rotor motor. In daily life, when using a wall-mounted boiler to heat with gas as energy, an EC gas fan is often needed to improve combustion efficiency and ensure indoor air circulation.

[0003] In the prior art, it is generally installed in a wall-mounted boiler. When it is installed on the wall-mounted boiler, since it is generally welded on the wall-mounted boiler, it is difficult to disassemble it when it needs to be repaired, which increases the difficulty of repairing it. In the prior art, when connecting the gas pipeline to it, since the gas pipeline is generally directly inserted into the ventilation pipe, the gas pipeline may shake inside the ventilation pipe, which may affect its performance and make its use effect poor. Utility Model Content

[0004] The utility model provides an EC gas blower to solve the problems of inconvenient maintenance and poor use effect in the prior art, which can be easily maintained and improve the use effect.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an EC gas fan, comprising an EC gas fan body and a first mounting plate, a ventilation duct body is fixedly installed inside the EC gas fan body, and a third connecting plate is fixedly installed on the rear side of the EC gas fan body; a first clamping assembly is fixedly installed on the front side of the first mounting plate, a mounting assembly for mounting the first clamping assembly is fixedly installed on the front side of the first mounting plate, a second clamping assembly for clamping the EC gas fan body is fixedly installed on the rear side of the third connecting plate, a first limiting assembly for limiting the second clamping assembly is slidably installed on the front side of the first mounting plate, and a first positioning assembly for positioning the first limiting assembly is fixedly installed on the front side of the first mounting plate; a second limiting assembly for limiting the inside of the ventilation duct body is movably installed inside the ventilation duct body, a supporting assembly for supporting the second limiting assembly is fixedly installed on the front side of the third connecting plate, and a second positioning assembly for positioning the supporting assembly is fixedly installed on the front side of the third connecting plate.

[0006] Furthermore, the first clamping assembly includes a second mounting plate, the rear side of the second mounting plate is fixedly mounted on the front side of the first mounting plate, and the left and right sides of the second mounting plate are both provided with supporting grooves.

[0007] Furthermore, the mounting assembly includes a support block, a rear side of the support block is fixedly mounted on the front side of the first mounting plate, and the interior of the support block and the interior of the first mounting plate are threadedly connected with mounting screws.

[0008] Furthermore, the second clamping assembly includes a clamping plate, the front side of which is fixedly mounted on the rear side of the third connecting plate, and the clamping plate is movably mounted inside the second mounting plate.

[0009] Furthermore, the first limiting assembly includes two second support plates, the rear sides of the two second support plates are slidably mounted on the front side of the first mounting plate, the front sides of the two second support plates are fixedly connected with a long holding rod, the top and bottom of the two second support plates are fixedly connected with a limiting rod, one side of the two second support plates is fixedly connected with a spring and a limiting plate, one end of the spring is fixedly mounted on the inner wall of one end of the support groove, the limiting plate is slidably connected to the second mounting plate, and the limiting plate is movably mounted inside the clamping plate.

[0010] Furthermore, the first positioning assembly includes a door-shaped plate, the rear side of the door-shaped plate is fixedly mounted on the front side of the first mounting plate, the door-shaped plate is fixedly connected to the second mounting plate, and the door-shaped plate is slidably connected to the second support plate and the limit rod respectively.

[0011] Furthermore, the second limiting assembly includes an arc-shaped pressure plate, which is movably installed inside the ventilation duct main body, one side of the arc-shaped pressure plate is fixedly connected to a support rod, the support rod is movably installed inside the ventilation duct main body, a side of the support rod away from the arc-shaped pressure plate is rotatably connected to a threaded shaft, an end of the threaded shaft close to the support rod is fixedly connected to a convex shaft, the convex shaft is rotatably installed inside the support rod, an end of the threaded shaft away from the support rod is fixedly connected to a holding column, and a limiting ring is fixedly connected to the outer surface of an end of the holding column close to the threaded shaft.

[0012] Furthermore, the support assembly includes a first support plate, the rear side of the first support plate is fixedly installed on the front side of the third connecting plate, the first support plate is fixedly connected to the ventilation duct main body, the first support plate is threadedly connected to the threaded shaft, the interior of the first support plate is fixedly connected with a positioning plate, the positioning plate is fixedly connected to the ventilation duct main body, and the first support plate and the positioning plate are both movably connected to the support rod.

[0013] Furthermore, the second positioning assembly includes a second connecting plate, the rear side of the second connecting plate is fixedly installed on the front side of the third connecting plate, the top of the second connecting plate is fixedly connected to the first connecting plate, the first connecting plate is fixedly connected to the first support plate, the interior of the first connecting plate and the front side of the first support plate are slidably connected with an L-shaped plate, one end of the L-shaped plate is fixedly connected to a support ring, and the support ring is rotatably connected to the threaded shaft, the holding column and the limit ring respectively.

[0014] The working principle and use principle of the utility model are as follows: in the process of using the device, through the arrangement of the EC gas fan body, the ventilation duct body and the third connecting plate, in the process of using the wall-mounted boiler to use gas as energy for heating, the device can improve the combustion efficiency and ensure indoor air circulation; through the arrangement of the first mounting plate, the first clamping assembly, the mounting assembly, the second clamping assembly, the first limiting assembly and the first positioning assembly, when the device is installed on the wall-mounted boiler, the device can be indirectly installed on the wall-mounted boiler by clamping, so that the device can be conveniently disassembled when maintenance is required, so that the device can avoid the difficulty of maintenance due to the difficulty of disassembly when maintenance is required, so that the device can be conveniently maintained; and in the process of using the device, through the arrangement of the second limiting assembly, the supporting assembly and the second positioning assembly, when the gas pipeline and the ventilation duct body are connected, the gas pipeline can be pressed by the device inside the ventilation duct body, so that the device can avoid the use performance of the device being affected by the shaking of the gas pipeline inside the ventilation duct body, so that the device can avoid the use effect being reduced due to the affected use performance, so that the device can improve the use effect.

[0015] The beneficial technical effects of the utility model are:

[0016] By configuring the EC gas fan body, the ventilation duct body and the third connecting plate, the device can improve combustion efficiency and ensure indoor air circulation during heating using a wall-mounted boiler utilizing gas as energy. By configuring the first mounting plate, the first clamping assembly, the mounting assembly, the second clamping assembly, the first limiting assembly and the first positioning assembly, the device can be conveniently disassembled when maintenance is required, so that the device can be conveniently maintained. Moreover, by configuring the second limiting assembly, the supporting assembly and the second positioning assembly, when the gas pipeline and the ventilation duct body are connected, the gas pipeline can be compressed by the device inside the ventilation duct body, so that the use effect of the device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0018] Figure 1 It is the first frontal stereoscopic schematic diagram of the utility model.

[0019] Figure 2 It is a three-dimensional schematic diagram of the door-shaped plate of the utility model.

[0020] Figure 3 It is a three-dimensional schematic diagram of the limiting plate of the utility model.

[0021] Figure 4 It is a three-dimensional schematic diagram of the second mounting plate of the utility model.

[0022] Figure 5 It is a second frontal stereoscopic schematic diagram of the utility model.

[0023] Figure 6 It is a three-dimensional schematic diagram of an L-shaped plate of the utility model.

[0024] Figure 7 It is a three-dimensional schematic diagram of the first supporting plate of the utility model.

[0025] Figure 8 It is a first top view partial cross-sectional schematic diagram of the utility model.

[0026] Fig. 9 It is a second top view partial cross-sectional schematic diagram of the utility model.

[0027] Fig.10 This utility model Fig. 9 Enlarged three-dimensional schematic diagram at point A in the middle.

[0028] Explanation of the numbers in the figure: 1. first support plate; 2. first connecting plate; 3. threaded shaft; 4. support ring; 5. holding column; 6. L-shaped plate; 7. second connecting plate; 8. door-shaped plate; 9. holding long rod; 10. second support plate; 11. limiting rod; 12. EC gas blower body; 13. ventilation duct body; 14. third connecting plate; 15. second mounting plate; 16. mounting screw; 17. support block; 18. first mounting plate; 19. limiting plate; 20. supporting groove; 21. spring; 22. arc pressure plate; 23. positioning plate; 24. clamping plate; 25. limiting ring; 26. convex shaft; 27. support rod. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the embodiments of the present application easy to understand, the embodiments of the present application are further explained below in combination with diagrams and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the embodiments of the present application and are not used to limit the embodiments of the present application.

[0030] Embodiment 1: Figures 1 to 10As shown: an EC gas blower comprises an EC gas blower body 12 and a first mounting plate 18, wherein a ventilation duct body 13 is fixedly mounted inside the EC gas blower body 12, and a third connecting plate 14 is fixedly mounted on the rear side of the EC gas blower body 12; a first clamping assembly is fixedly mounted on the front side of the first mounting plate 18, a mounting assembly is fixedly mounted on the front side of the first mounting plate 18, a second clamping assembly is fixedly mounted on the rear side of the third connecting plate 14, a first limiting assembly is slidably mounted on the front side of the first mounting plate 18, and a first positioning assembly is fixedly mounted on the front side of the first mounting plate 18; a second limiting assembly is movably mounted inside the ventilation duct body 13, a supporting assembly is fixedly mounted on the front side of the third connecting plate 14, and a second positioning assembly is fixedly mounted on the front side of the third connecting plate 14.

[0031] In this embodiment, by arranging the EC gas fan body 12, the ventilation duct body 13 and the third connecting plate 14, in the process of using the wall-mounted boiler to use gas as energy for heating, the device can improve the combustion efficiency and ensure indoor air circulation. By arranging the first mounting plate 18, the first clamping assembly, the mounting assembly, the second clamping assembly, the first limiting assembly and the first positioning assembly, the first clamping assembly and the second clamping assembly can both be clamped to the EC gas fan body 12, the mounting assembly can be installed to a clamping assembly, the first limiting assembly can limit the second clamping assembly, and the first positioning assembly can position the first limiting assembly. When the device is installed on the wall-mounted boiler, the device can be indirectly installed on the wall-mounted boiler by clamping, so that the device can be installed on the wall-mounted boiler. When maintenance is required, it can be easily disassembled, so that the device can avoid the difficulty of maintenance due to the difficulty of disassembly when maintenance is required, so that the device can be easily maintained. Through the arrangement of the second limit component, the support component and the second positioning component, the second limit component can be limited inside the ventilation duct main body 13, the support component can support the second limit component, and the second positioning component can position the support component. When connecting the gas pipeline and the ventilation duct main body 13, the gas pipeline can be pressed by the device inside the ventilation duct main body 13, so that the device can avoid the performance of use being affected by the shaking of the gas pipeline inside the ventilation duct main body 13, so that the device can avoid the use effect being reduced due to the affected performance, so that the device can improve the use effect.

[0032] Embodiment 2: Figures 1 to 10 As shown: an EC gas blower includes a support block 17, the interior of the support block 17 and the interior of a first mounting plate 18 are threadedly connected with mounting screws 16, and the number of the mounting screws 16 is four.

[0033] In this embodiment, when the device is not in use, one end of the mounting screw 16 is respectively located inside the first mounting plate 18 and inside the support block 17, the limit plate 19 is located inside the clamping plate 24, the clamping plate 24 is located inside the second mounting plate 15, and the third connecting plate 14 is in contact with the second mounting plate 15. In the process of using the wall-mounted boiler to use gas as energy for heating, when it is necessary to improve the combustion efficiency of the device and ensure indoor air circulation, the device must first be installed on the wall-mounted boiler, the first mounting plate 18 is moved so that the rear side of the first mounting plate 18 is in contact with the wall-mounted boiler, and the four mounting screws 16 are rotated at the same time so that the mounting screws 16 rotate along the support block 17 and the first mounting plate 18 respectively and move toward the direction close to the wall-mounted boiler. When the mounting screws 16 rotate along the support block 17 and the first mounting plate 18 respectively and move toward the direction close to the wall-mounted boiler to the maximum distance, one end of the mounting screw 16 enters the interior of the wall-mounted boiler, and the first mounting plate 18 is installed on the wall-mounted boiler. At this time, the device can be indirectly installed on the wall-mounted boiler.

[0034] Embodiment 3: Figures 1 to 10 As shown: an EC gas blower, comprising a second mounting plate 15, a clamping plate 24, two second support plates 10 and a door-shaped plate 8, support grooves 20 are provided on the left and right sides of the second mounting plate 15, the clamping plate 24 is movably installed inside the second mounting plate 15, the front sides of the two second support plates 10 are fixedly connected with holding long rods 9, the number of the holding long rods 9 is two, the tops and bottoms of the two second support plates 10 are fixedly connected with limit rods 11, one side of the two second support plates 10 is fixedly connected with a spring 21 and a limit plate 19, the door-shaped plate 8 is fixedly connected to the second mounting plate 15, and the door-shaped plate 8 is slidably connected to the second support plate 10 and the limit rod 11 respectively.

[0035] In this embodiment, after the device is indirectly installed on the wall-mounted boiler, when the device needs to be repaired, the two holding long rods 9 are pulled in the direction away from the EC gas fan body 12 at the same time, so that the second support plate 10 slides along the first mounting plate 18 and the door-shaped plate 8 in the direction away from the EC gas fan body 12 respectively, and the limiting rod 11 slides along the door-shaped plate 8 in the direction away from the EC gas fan body 12, so that the spring 21 located in the support groove 20 is stretched in the direction away from the EC gas fan body 12, so that the limiting plate 19 slides along the clamping plate 24 and the second mounting plate 15 in the direction away from the EC gas fan body 12 respectively. When the two holding long rods 9 are pulled in the direction away from the EC gas fan body 12 to the maximum distance at the same time, one end of the limiting plate 19 is located inside the second mounting plate 15, and the state of pulling the two holding long rods 9 in the direction away from the EC gas fan body 12 to the maximum distance remains unchanged, and the limiting plate 19 is moved to the position of the second mounting plate 15. The EC gas blower body 12 is moved in a direction away from the second mounting plate 15, so that the third connecting plate 14 is out of contact with the second mounting plate 15, and the clamping plate 24 slides along the second mounting plate 15 in a direction away from the second mounting plate 15. When the clamping plate 24 slides out from the inside of the second mounting plate 15, the two holding long rods 9 are released, and the spring 21 changes from a stretched state to a compressed state, so that the limit plate 19 slides along the second mounting plate 15 in a direction close to the EC gas blower body 12, so that the limit plate 19 slides into the second mounting plate 15, so that the clamping plate 24 is taken out, so that the device can be disassembled, and the device can be repaired at this time. In the process of repairing the device, the device can be indirectly installed on the wall-mounted boiler by clamping, so that the device can be easily disassembled when maintenance is required, so that the device can avoid the difficulty of maintenance due to the difficulty of disassembly when maintenance is required, so that the device can be easily repaired.

[0036] Embodiment 4: Figures 1 to 10 As shown: an EC gas blower, comprising an arc-shaped pressing plate 22, a first supporting plate 1 and a second connecting plate 7, one side of the arc-shaped pressing plate 22 is fixedly connected with a supporting rod 27, the side of the supporting rod 27 away from the arc-shaped pressing plate 22 is rotatably connected with a threaded shaft 3, one end of the threaded shaft 3 close to the supporting rod 27 is fixedly connected with a convex shaft 26, one end of the threaded shaft 3 away from the supporting rod 27 is fixedly connected with a holding column 5, the outer surface of one end of the holding column 5 close to the threaded shaft 3 is fixedly connected with a limiting ring 25, the number of the holding columns 5 is two, the first supporting plate 1 is fixedly connected to the ventilation duct main body 13, the first supporting plate 1 is threadedly connected to the threaded shaft 3, the interior of the first supporting plate 1 is fixedly connected with a positioning plate 23, the top of the second connecting plate 7 is fixedly connected with the first connecting plate 2, the interior of the first connecting plate 2 and the front side of the first supporting plate 1 are slidably connected with an L-shaped plate 6, and one end of the L-shaped plate 6 is fixedly connected with a supporting ring 4.

[0037] In the present embodiment, after the present device is indirectly mounted on the wall-mounted boiler, when the gas pipeline is connected to the ventilation duct body 13, after the gas pipeline enters into the ventilation duct body 13, the two holding columns 5 are rotated at the same time, so that the holding column 5 and the limiting ring 25 are both rotated along the support ring 4, so that the threaded shaft 3 is respectively rotated along the support ring 4 and the support rod 27, so that the convex shaft 26 is rotated along the support rod 27, and under the action of the threaded transmission, the threaded shaft 3 is rotated along the first support plate 1 and moves toward the direction of the gas pipeline inside the ventilation duct body 13, so that the arc-shaped pressing plate 22 slides along the ventilation duct body 13 toward the direction of the gas pipeline inside the ventilation duct body 13, so that the support rod 27 slides along the first support plate 1, the positioning plate 23 and the ventilation duct body 13 toward the direction of the gas pipeline inside the ventilation duct body 13, so that the support ring 4 and the holding column 5 are both moved toward the direction of the gas pipeline inside the ventilation duct body 13, so that the L-shaped plate 6 is respectively moved along the first support plate 1 and the first connecting plate 2 toward the ventilation duct body 13. The convex shaft 26 is deformed and squeezes the gas pipeline in the ventilation duct body 13, and the two holding columns 5 are stopped and rotated at the same time. At this time, the gas pipeline in the ventilation duct body 13 can be compressed. After the gas pipeline in the ventilation duct body 13 is compressed, the EC gas fan body 12 is powered on. Under the action of the EC gas fan body 12, the ventilation duct body 13 and the third connecting plate 14, the device can improve the combustion efficiency and ensure indoor air circulation in the process of using the wall-mounted boiler to use gas as energy for heating. In the process of the gas pipeline in the ventilation duct body 13 being compressed, when the gas pipeline is connected to the ventilation duct body 13, the gas pipeline can be compressed by the device inside the ventilation duct body 13, so that the device can avoid being affected by the shaking of the gas pipeline inside the ventilation duct body 13. The use effect of the device can be reduced due to the affected use performance, and the use effect of the device can be improved.

[0038] In this embodiment, the EC gas blower body 12 is electrically connected to the power supply, the arc-shaped pressing plate 22 is made of rubber, and the diameter of the threaded shaft 3 is greater than the diameter of the holding column 5 .

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. An EC gas fan, comprising an EC gas fan body (12) and a first mounting plate (18), wherein a ventilation duct body (13) is fixedly mounted inside the EC gas fan body (12), and a third connecting plate (14) is fixedly mounted on the rear side of the EC gas fan body (12); characterized in that The first mounting plate (18) is fixedly mounted with a first clamping assembly for clamping the EC gas fan body (12) on the front side, the first mounting plate (18) is fixedly mounted with a mounting assembly for mounting the first clamping assembly on the front side, the third connecting plate (14) is fixedly mounted with a second clamping assembly for clamping the EC gas fan body (12) on the rear side, the first mounting plate (18) is slidably mounted with a first limiting assembly for limiting the second clamping assembly on the front side, the first mounting plate (18) is fixedly mounted with a first positioning assembly for positioning the first limiting assembly on the front side; the second limiting assembly for limiting the position inside the ventilation duct body (13) is movably mounted inside the ventilation duct body (13), the front side of the third connecting plate (14) is fixedly mounted with a supporting assembly for supporting the second limiting assembly, and the front side of the third connecting plate (14) is fixedly mounted with a second positioning assembly for positioning the supporting assembly.

2. An EC gas blower according to claim 1, characterized in that: The first clamping assembly comprises a second mounting plate (15), the rear side of the second mounting plate (15) being fixedly mounted on the front side of the first mounting plate (18), and support grooves (20) are provided on the left and right sides of the second mounting plate (15).

3. The EC gas blower according to claim 1, characterized in that: The mounting assembly comprises a support block (17), the rear side of the support block (17) being fixedly mounted on the front side of a first mounting plate (18), and the interior of the support block (17) and the interior of the first mounting plate (18) being threadedly connected with mounting screws (16).

4. The EC gas blower according to claim 2, characterized in that: The second clamping assembly comprises a clamping plate (24), the front side of the clamping plate (24) is fixedly mounted on the rear side of the third connecting plate (14), and the clamping plate (24) is movably mounted inside the second mounting plate (15).

5. An EC gas blower according to claim 2 or 4, characterized in that: The first limiting assembly comprises two second support plates (10), the rear sides of the two second support plates (10) are slidably mounted on the front side of the first mounting plate (18), the front sides of the two second support plates (10) are fixedly connected to a gripping long rod (9), the tops and bottoms of the two second support plates (10) are fixedly connected to a limiting rod (11), one side of the two second support plates (10) is fixedly connected to a spring (21) and a limiting plate (19), one end of the spring (21) is fixedly mounted on an inner wall of one end of the support groove (20), the limiting plate (19) is slidably connected to the second mounting plate (15), and the limiting plate (19) is movably mounted inside the clamping plate (24).

6. The EC gas blower according to claim 5, characterized in that: The first positioning assembly comprises a door-shaped plate (8), the rear side of the door-shaped plate (8) is fixedly mounted on the front side of the first mounting plate (18), the door-shaped plate (8) is fixedly connected to the second mounting plate (15), and the door-shaped plate (8) is slidably connected to the second support plate (10) and the limiting rod (11) respectively.

7. The EC gas blower according to claim 1, characterized in that: The second limiting assembly comprises an arc-shaped pressing plate (22), the arc-shaped pressing plate (22) is movably mounted inside the ventilation duct body (13), one side of the arc-shaped pressing plate (22) is fixedly connected to a support rod (27), the support rod (27) is movably mounted inside the ventilation duct body (13), a side of the support rod (27) away from the arc-shaped pressing plate (22) is rotatably connected to a threaded shaft (3), an end of the threaded shaft (3) close to the support rod (27) is fixedly connected to a convex shaft (26), the convex shaft (26) is rotatably mounted inside the support rod (27), an end of the threaded shaft (3) away from the support rod (27) is fixedly connected to a holding column (5), and an outer surface of an end of the holding column (5) close to the threaded shaft (3) is fixedly connected to a limiting ring (25).

8. The EC gas blower according to claim 2, characterized in that: The second limiting assembly comprises an arc-shaped pressing plate (22), the arc-shaped pressing plate (22) is movably mounted inside the ventilation duct body (13), one side of the arc-shaped pressing plate (22) is fixedly connected to a support rod (27), the support rod (27) is movably mounted inside the ventilation duct body (13), a side of the support rod (27) away from the arc-shaped pressing plate (22) is rotatably connected to a threaded shaft (3), an end of the threaded shaft (3) close to the support rod (27) is fixedly connected to a convex shaft (26), the convex shaft (26) is rotatably mounted inside the support rod (27), an end of the threaded shaft (3) away from the support rod (27) is fixedly connected to a holding column (5), and an outer surface of an end of the holding column (5) close to the threaded shaft (3) is fixedly connected to a limiting ring (25).

9. The EC gas blower according to claim 7, characterized in that: The support assembly comprises a first support plate (1), the rear side of the first support plate (1) is fixedly mounted on the front side of the third connecting plate (14), the first support plate (1) is fixedly connected to the ventilation duct body (13), the first support plate (1) is threadedly connected to the threaded shaft (3), a positioning plate (23) is fixedly connected inside the first support plate (1), the positioning plate (23) is fixedly connected to the ventilation duct body (13), and the first support plate (1) and the positioning plate (23) are both movably connected to the support rod (27).

10. An EC gas blower according to claim 9, characterized in that: The second positioning assembly comprises a second connecting plate (7), the rear side of the second connecting plate (7) is fixedly mounted on the front side of the third connecting plate (14), the top of the second connecting plate (7) is fixedly connected to the first connecting plate (2), the first connecting plate (2) is fixedly connected to the first supporting plate (1), the interior of the first connecting plate (2) and the front side of the first supporting plate (1) are slidably connected to an L-shaped plate (6), one end of the L-shaped plate (6) is fixedly connected to a supporting ring (4), and the supporting ring (4) is rotatably connected to the threaded shaft (3), the holding column (5) and the limiting ring (25) respectively.

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