Induced draft fan for boiler
By designing a filter box and anti-reflow pipe in the boiler induced fan, the problems of dust cleaning and high-temperature gas reflux are solved, and convenient dust cleaning and safety protection of the induced fan are achieved.
Patent Information
- Application Number
- CN202420424235.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-03-06
AI Technical Summary
When used in the existing boiler induced air fans, it is difficult to effectively clean up the dust left after filtering, and high-temperature gas may enter the induced air fan body in reverse, causing irreversible damage.
An induction fan for boiler including a filter box and an anti-reflow pipe is designed. The filter box uses multiple filter mesh and air pump to clean up dust, and the anti-reflow pipe is passed through the flip plate and limit column to avoid high-temperature gas reflux.
It realizes convenient cleaning of dust, reduces the labor intensity of operators, and effectively avoids damage to the induced fan body by high-temperature gas.
Smart Images
Figure CN222634613U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boiler induced draft, and in particular relates to an induced draft fan for a boiler. Background Art
[0002] Boiler is an important heat supply equipment in the national economy. In the operation of the boiler, it is necessary to use the induced draft fan in conjunction with the boiler to increase the working efficiency of the boiler. By sending air (oxygen) into the boiler through the induced draft fan, the combustion efficiency inside the boiler can be improved, making the fuel burn more fully.
[0003] However, the existing boiler induced draft fan can filter the extracted gas during use, but the dust left after the gas filtering is difficult to clean out; at the same time, the high-temperature gas generated inside the boiler occasionally reverses into the inside of the induced draft fan body and causes irreversible damage to the inside of the induced draft fan body, and the current boiler induced draft fan cannot solve the above problems well. Utility Model Content
[0004] The utility model aims to provide an induced draft fan for a boiler to solve the problems mentioned in the background technology.
[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:
[0006] The utility model is a boiler induced draft fan, comprising a base, a filter box, an air inlet, a fan body, a motor, an anti-backflow pipe and a conversion joint, wherein the base is fixed to the ground by bolts, wherein the filter box, the fan body and the motor are fixed to the upper side of the base by bolts respectively; an air inlet is opened at one end of the filter box, wherein the other end of the filter box is fixed to the air inlet end of the fan body by bolts; a fan is rotatably mounted inside the fan body by a supporting bearing, and the fan is fixed to the output end of the motor; the air outlet end of the fan body is fixed with the anti-backflow pipe by bolts, wherein the other end of the anti-backflow pipe is fixed with the conversion joint by bolts, and the other end of the conversion joint is fixed to the air inlet end of the boiler by bolts.
[0007] Furthermore, the filter box includes a box body, an air inlet pipe, a first valve body, a conduction pipe, a second valve body, a filter, a push-pull box, a cover body and an air pump, the box body is fixed to the upper side of the base by bolts, and one end of the box body is fixed with the air inlet pipe by a joint, wherein the middle part of the air inlet pipe is fixed with the first valve body; the other end of the box body is fixed with the conduction pipe by a joint, wherein the middle part of the conduction pipe is fixed with the second valve body, and the other end of the conduction pipe is fixed to the air inlet end of the fan body by the joint; a plurality of the filter nets are fixed to the inside of the box body by bolts, wherein the lower side of the filter nets is in contact with the upper side of the cover body, and the cover body is fixed to the upper end of the push-pull box; the push-pull box is slidably installed inside the box body by a slide; the outer side of the box body is fixed with the air pump by bolts, wherein the output end of the air pump is communicated with the inside of the box body, such an arrangement can filter the gas entering the device and facilitate the removal of dust attached to the filter net.
[0008] Furthermore, the anti-backflow pipe includes a pipe body, a flip plate, a counterweight and a limit column, one end of the pipe body is connected to the air outlet end of the fan body by bolts, and the other end of the pipe body is fixed with a conversion joint by bolts; a flip plate is rotatably installed inside the pipe body, wherein the lower end of the flip plate is fixed with a counterweight by bolts, and the upper and lower ends of the flip plate are arc-shaped respectively; when the flip plate is vertical, it is arranged in fit with a side of the limit column away from the conversion joint, wherein the two ends of the limit column are fixed to the inner wall of the pipe body by welding respectively, such an arrangement can prevent the high-temperature gas inside the boiler from entering the inside of the fan body.
[0009] Furthermore, the cross-sectional shape of the tube body is rectangular; the cross-sectional shape of one end of the conversion joint connected to the boiler air inlet end is circular, and the cross-sectional shape of one end connected to the tube body is rectangular. Such a setting can select a suitable installation method according to the shape of the boiler air inlet end.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] 1. The setting of the filter box of the utility model is that when it is in use, external air can enter the inside of the box from the air inlet pipe, and then pass through multiple filter screens in sequence, and finally enter the inside of the fan body through the conduction pipe, wherein the filter screen can filter the gas. When the filter screen needs to be cleaned, first take out the push-pull box, remove the cover body, then reset the push-pull box, and close the first valve body and the second valve body, and then turn on the air pump, and the air pump blows air into the inside of the box, thereby blowing off the dust attached to the filter screen, and the dust will fall into the push-pull box. At this time, the user can take out the dust by taking out the push-pull box. Such a setting simplifies the cleaning process of the filter screen and reduces the labor intensity of the operator. At the same time, by collecting the dust in the push-pull box, it is also convenient to uniformly handle the dust, which is conducive to keeping the working environment clean.
[0012] 2. The utility model sets the anti-backflow pipe. When the gas enters the interior of the pipe under the action of the fan body, the gas will drive the flip plate to rotate, so that the gas enters the boiler. When the gas inside the boiler expands and enters the interior of the pipe, the gas will hit the flip plate. The limit column limits the flip plate, thereby preventing the high-temperature gas inside the boiler from damaging the fan body. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0014] Figure 1 It is a structural schematic diagram of the utility model.
[0015] Figure 2 It is a schematic diagram of the filter box structure of the utility model.
[0016] Figure 3 It is a schematic diagram of the structure of the anti-backflow pipe of the utility model.
[0017] In the figure:
[0018] 1-base, 2-filter box, 21-box body, 22-air inlet pipe, 23-first valve body, 24-conduction pipe, 25-second valve body, 26-filter screen, 27-push-pull box, 28-cover body, 29-air pump, 3-air inlet, 4-fan body, 5-motor, 6-anti-backflow pipe, 61-tube body, 62-flip plate, 63-counterweight block, 64-limiting column, 7-conversion joint. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "all around" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.
[0021] See also Figure 1 As shown, the utility model is a boiler induced draft fan, comprising a base 1, a filter box 2, an air inlet 3, a fan body 4, a motor 5, an anti-backflow pipe 6 and a conversion joint 7. The base 1 is fixed to the ground by bolts, wherein the filter box 2, the fan body 4 and the motor 5 are fixed to the upper side of the base 1 by bolts respectively; an air inlet 3 is opened at one end of the filter box 2, wherein the other end of the filter box 2 is fixed to the air inlet end of the fan body 4 by bolts; a fan is rotatably mounted inside the fan body 4 through a supporting bearing, and the fan is fixed to the output end of the motor 5; the air outlet end of the fan body 4 is fixed with an anti-backflow pipe 6 by bolts, wherein the other end of the anti-backflow pipe 6 is fixed with a conversion joint 7 by bolts, and the other end of the conversion joint 7 is fixed to the air inlet end of the boiler by bolts.
[0022] like Figure 2 As shown, the filter box 2 includes a box body 21, an air inlet pipe 22, a first valve body 23, a conduction pipe 24, a second valve body 25, a filter screen 26, a push-pull box 27, a cover body 28 and an air pump 29. The box body 21 is fixed to the upper side of the base 1 by bolts, and one end of the box body 21 is fixed with the air inlet pipe 22 by a joint, wherein the middle part of the air inlet pipe 23 is fixed with the first valve body 23; the other end of the box body 21 is fixed with the conduction pipe 24 by a joint, wherein the middle part of the conduction pipe 24 is fixed with The second valve body 25, and the other end of the conduction pipe 24 is fixed to the air inlet end of the fan body 4 through a joint; a plurality of filter screens 26 are fixed to the inside of the box body 21 by bolts, wherein the lower side of the filter screens 26 is in contact with the upper side of the cover body 28, and the cover body 28 is fixed to the upper end of the push-pull box 27; the push-pull box 27 is slidably installed in the box body 21 through a slide; an air pump 29 is fixed to the outer side of the box body 21 by bolts, wherein the output end of the air pump 29 is communicated with the inside of the box body 21;
[0023] When in use, external air can enter the box body 21 from the air inlet pipe 22, then pass through multiple filters 26 in sequence, and finally enter the fan body 4 through the conduction pipe 24, wherein the filter 26 can filter the gas; when the filter 26 needs to be cleaned, first take out the push-pull box 27, remove the cover 28, then reset the push-pull box 27, and close the first valve body 23 and the second valve body 25, then turn on the air pump 29, and the air pump 29 blows air into the box body 21, thereby blowing off the dust attached to the filter 26, and the dust will fall into the push-pull box 27. At this time, the user can take out the dust by taking out the push-pull box 27.
[0024] like Figure 3 As shown, the anti-backflow pipe 6 includes a pipe body 61, a flip plate 62, a counterweight 63 and a limiting column 64, one end of the pipe body 61 is connected to the air outlet end of the fan body 4 by bolts, and the other end of the pipe body 61 is fixed with a conversion joint 7 by bolts; a flip plate 62 is rotatably installed inside the pipe body 61, wherein the lower end of the flip plate 62 is fixed with a counterweight 63 by bolts, and the upper and lower ends of the flip plate 62 are respectively arc-shaped; when the flip plate 62 is vertical, it is fitted with a side of the limiting column 64 away from the conversion joint 7, wherein the two ends of the limiting column 64 are respectively fixed to the inner wall of the pipe body 61 by welding, and the limiting column 64 is located on the side of the flip plate 62 close to the conversion joint 7;
[0025] When the fan body 4 does not draw air, the flip plate 62 remains in a vertical state under the action of the gravity of the counterweight 63; when the gas enters the tube body 61 under the action of the fan body 4, the gas will drive the flip plate 62 to rotate in the direction of the fan body 4, so that the gas enters the boiler through the tube body 61 and the conversion joint 7; when the high-temperature gas inside the boiler expands and flows back through the conversion joint 7 to the tube body 61, the reverse flow of gas causes the flip plate 62 to have a tendency to rotate in the direction of the conversion joint 7, but the limit column 64 prevents the flip plate 62 from rotating, so that the flip plate 62 remains in a vertical state, and the reverse flow of gas cannot flow into the fan body 4, thereby preventing the gas inside the boiler from damaging the fan body 4.
[0026] Specifically, the cross-sectional shape of the tube body 61 is rectangular; the cross-sectional shape of one end of the conversion joint 7 connected to the boiler air inlet end is circular, and the cross-sectional shape of the other end connected to the tube body 61 is rectangular; when in use, if the shape of the boiler air inlet end is circular, it can be fixed to the boiler air inlet end through the conversion joint 7, and if the shape of the boiler air inlet end is rectangular, the tube body 61 can be directly fixed to the boiler air inlet end.
[0027] See also Figure 1-3As shown, the utility model is a boiler induced draft fan, and its working principle is: when in use, the fan inside the fan body 4 is first driven to rotate by the motor 5, and the external gas is sucked into the induced draft fan and passes through the filter box 2, and then sent into the boiler through the anti-backflow pipe 6, wherein the filter box 2 can filter the gas, and the anti-backflow pipe 6 can prevent the gas from flowing back.
[0028] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0029] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A boiler induced draft fan, comprising a base (1), a filter box (2), an air inlet (3), a fan body (4), a motor (5), a backflow prevention pipe (6) and a conversion joint (7), characterized in that: The base (1) is fixed on the ground, wherein a filter box (2), a fan body (4) and a motor (5) are respectively fixed on the upper side of the base (1); an air inlet (3) is provided at one end of the filter box (2), wherein the other end of the filter box (2) is fixed to the air inlet end of the fan body (4); a fan is rotatably mounted inside the fan body (4), and the fan is fixed to the output end of the motor (5); an anti-backflow pipe (6) is fixed to the air outlet end of the fan body (4), wherein the other end of the anti-backflow pipe (6) is fixed to a conversion joint (7), and the other end of the conversion joint (7) is fixed to the air inlet end of the boiler.
2. The boiler induced draft fan according to claim 1, characterized in that: The filter box (2) comprises a box body (21), an air inlet pipe (22), a first valve body (23), a conduction pipe (24), a second valve body (25), a filter screen (26), a push-pull box (27), a cover body (28) and an air pump (29); the box body (21) is fixed to the upper side of the base (1), and the air inlet pipe (22) is fixed to one end of the box body (21), wherein the first valve body (23) is fixed to the middle of the air inlet pipe (22); the conduction pipe (24) is fixed to the other end of the box body (21), wherein the middle of the conduction pipe (24) is A second valve body (25) is fixed thereto, and the other end of the conduction tube (24) is fixed to the air inlet end of the fan body (4); a plurality of filter screens (26) are fixed inside the box body (21), wherein the lower side of the filter screens (26) is in contact with the upper side of a cover body (28), and the cover body (28) is fixed to the upper end of a push-pull box (27); the push-pull box (27) is slidably mounted inside the box body (21); an air pump (29) is fixed to the outer side of the box body (21), wherein the output end of the air pump (29) is in communication with the inside of the box body (21).
3. The boiler induced draft fan according to claim 1, characterized in that: The anti-backflow pipe (6) comprises a pipe body (61), a flip plate (62), a counterweight (63) and a limiting column (64); one end of the pipe body (61) is connected to the air outlet end of the fan body (4), and the other end of the pipe body (61) is fixed with a conversion joint (7); a flip plate (62) is rotatably mounted inside the pipe body (61), wherein a counterweight (63) is fixed at the lower end of the flip plate (62), and the upper and lower ends of the flip plate (62) are respectively arc-shaped; when the flip plate (62) is vertical, it is arranged in close contact with a side of the limiting column (64) away from the conversion joint (7), wherein the two ends of the limiting column (64) are respectively fixed to the inner wall of the pipe body (61), and the limiting column (64) is located on a side of the flip plate (62) close to the conversion joint (7).
4. The boiler induced draft fan according to claim 3, characterized in that: The cross-sectional shape of the tube body (61) is rectangular; the cross-sectional shape of the end of the conversion joint (7) connected to the air inlet end of the boiler is circular, and the cross-sectional shape of the end connected to the tube body (61) is rectangular.