Boiler flue gas recirculation device

Abstract

The utility model discloses a boiler flue gas recirculation device, which relates to the technical field of flue gas circulation devices and comprises a fan, a first pipeline and a second pipeline which are communicated with each other, a first filter screen movably connected in the second pipeline and provided with a filter station intercepted in the second pipeline in the moving process, and a second filter screen movably connected in the second pipeline. The receding station is attached to the inner wall of the second pipeline in a receding mode; the second filter screen is slidably connected into the first pipeline in the length direction of the first pipeline; one end of the operating rod is fixedly connected to the second filter screen, the other end of the operating rod extends and penetrates out of the first pipeline, the second filter screen can be driven to move along the first pipeline when the operating rod is moved in the length direction of the first pipeline, and after the first filter screen is blocked, the first filter screen can be withdrawn, so that the second filter screen continues to filter smoke; and therefore, the cleaning frequency of the filter screen or the replacement frequency of the filter screen is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas circulation devices, in particular to a boiler flue gas recirculation device. Background Art

[0002] In the boiler flue gas circulation device, it is necessary to use a filter. First of all, the filter can prevent solid particles in the flue gas (such as unburned fuel particles, dust, etc.) from entering the recirculation fan and other key equipment. If these solid particles enter the fan, they may cause wear of the fan blades and affect the performance and service life of the fan.

[0003] The patent with announcement number CN209978078U discloses a flue gas waste heat recovery and recycling device, which includes an outer box and a recovery box, and both sides of the bottom of the inner wall of the outer box are fixedly connected with fixed blocks, and the tops of the two fixed blocks are fixedly connected to the bottom of the recovery box. This device relates to the technical field of recovery and recycling devices; the flue gas waste heat recovery and recycling device is fixedly connected with an air inlet hopper between the top and bottom of the inner wall of the recovery box and on the right side of the mounting plate, and one end of the air inlet hopper is connected to a first conduit, and the surface of the first conduit is fixedly connected to a second conduit, and the interior of the first conduit is fixedly connected to a heat conducting plate, and the second conduit is annularly coiled inside the insulation sleeve, and the surface of the second conduit contacts the inner wall of the insulation sleeve, which can effectively recover and recycle the heat carried in the flue gas, increase the contact area between the heat in the flue gas and the heat exchange tube, and improve the utilization efficiency of the heat in the flue gas. It is highly practical and worthy of promotion.

[0004] In the prior art such as that in the above-mentioned patent, the flue gas entering the fan can be filtered through a filter to protect the fan. However, a large amount of impurities accumulate on the filter due to long-term use or insufficient combustion of fuel in the boiler, which affects the flow of flue gas in the pipeline and thus affects the circulation of flue gas. Utility Model Content

[0005] The purpose of the utility model is to provide a boiler flue gas recirculation device to solve the deficiencies in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a boiler flue gas recirculation device, comprising a fan and a first pipe and a second pipe connected to each other, the air suction port of the fan being connected to the first pipe, and also comprising: a first filter screen, which is movably connected in the second pipe, and has a filtering position intercepting in the second pipe and a retreat position avoiding and fitting to the inner wall of the second pipe during the movement of the first filter screen; a second filter screen, which is slidably connected in the first pipe along the length of the first pipe; an operating rod, one end of which is fixedly connected to the second filter screen, and the other end extends through the outside of the first pipe. When the operating rod is moved along the length of the first pipe, the second filter screen can be driven to move along the first pipe, and the second filter screen drives the first filter screen to switch from the filtering position to the retreat position through the connecting rod assembly.

[0007] Furthermore, a fixing frame is fixedly installed in the second pipe, the first filter includes at least one flip unit, the flip unit includes a first screen frame and a first screen body, the first screen frame is rotatably connected to the fixing frame, and the first screen body is fixedly connected to the first screen frame.

[0008] Furthermore, there are two flip units, and the connecting rod assembly includes two hinged rods, one end of the two hinged rods is hinged to the second filter screen, and the other ends of the two hinged rods are respectively hinged to the two first screen frames.

[0009] Furthermore, the second filter screen includes a second screen frame and a second screen body, the second screen frame is slidably connected in the first pipe, and the second screen body is fixedly mounted on the second screen frame.

[0010] Furthermore, a handle is fixedly connected to the operating rod.

[0011] Furthermore, it also includes an electric push rod, which includes a shell and an actuator rod. The shell is fixedly installed on the outer casing of the fan, and the actuator rod is fixedly connected to the operating rod.

[0012] Furthermore, sealing rings are provided on both second screen frames.

[0013] Furthermore, a pressure sensor is provided on the second pipeline.

[0014] Compared with the prior art, the utility model provides a boiler flue gas recirculation device. When a large amount of impurities accumulate on the first filter screen and affect the circulation of flue gas between the first pipe and the second pipe, the second filter screen is pulled by the operating rod to slide the second filter screen away from the first filter screen. During the sliding process, the second filter screen will drive the first filter screen to move through the connecting rod assembly, so that the first filter screen switches from the filtering position to the retreat position. After that, the first filter screen will no longer filter the flue gas and the second filter screen will continue to perform the filtering work.

[0015] When the first filter is clogged, the first filter can be retracted to allow the second filter to continue filtering the flue gas, so that the flue gas circulation is not hindered, thereby reducing the frequency of filter cleaning or filter replacement and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of a portion of the structure of a flue gas circulation device provided in an embodiment of the present utility model;

[0018] Figure 2 A schematic diagram of the structure of the first filter screen provided in an embodiment of the present utility model in the filtering station;

[0019] Figure 3 A schematic diagram of the structure of the first filter provided in an embodiment of the present utility model rotating from the filtering position to the avoidance position;

[0020] Figure 4 This is a schematic structural diagram of a portion of the flue gas circulation device provided in an embodiment of the utility model from another perspective.

[0021] Description of reference numerals:

[0022] 1. Fan; 11. First pipe; 12. Second pipe; 121. Fixed frame; 2. First filter; 21. Turning unit; 211. First mesh frame; 212. First mesh body; 3. Second filter; 31. Second mesh frame; 32. Second mesh body; 4. Articulated rod; 5. Operating lever; 6. Electric push rod; 61. Housing; 62. Actuator rod; 7. Pressure sensor. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] See also Figure 1-4The embodiment of the present invention provides a boiler flue gas recirculation device, which includes a fan 1 and a first pipe 11 and a second pipe 12 that are connected to each other. The air suction port of the fan 1 is connected to the first pipe 11, and also includes a first filter screen 2, a second filter screen 3, a connecting rod and an operating rod 5. The first filter screen 2 is movably connected to the second pipe 12. During the movement of the first filter screen 2, it has a filtering position that intercepts in the second pipe 12 and a retreat position that avoids and fits into the inner wall of the second pipe 12; the second filter screen 3 is slidably connected to the first pipe 11 along the length of the first pipe 11; one end of the operating rod 5 is fixedly connected to the second filter screen 3, and the other end extends through the outside of the first pipe 11. When the operating rod 5 is moved along the length of the first pipe 11, it can drive the second filter screen 3 to move along the first pipe 11, and the second filter screen 3 passes through The connecting rod assembly drives the first filter screen 2 to switch from the filtering position to the retreat position. Specifically, a fixing frame 121 is fixedly installed in the second pipe 12. The first filter screen 2 includes two flip units 21. The flip unit 21 includes a first mesh frame 211 and a first mesh body 212. The first mesh frame 211 is rotatably connected to the fixing frame 121, and the first mesh body 212 is fixedly connected to the first mesh frame 211. The connecting rod assembly includes two hinged rods 4. One end of the two hinged rods 4 is hinged to the second filter screen 3, and the other ends of the two hinged rods 4 are respectively hinged to the two first mesh frames 211. The second filter screen 3 includes a second mesh frame 31 and a second mesh body 32. The second mesh frame 31 is slidably connected in the first pipe 11. The second mesh body 32 is fixedly installed on the second mesh frame 31. The two second mesh frames 31 are both provided with sealing rings, and a handle is fixedly connected to the operating rod 5.

[0025] When the impurities on the first mesh body 212 accumulate to the point where they have seriously hindered the flow of smoke from the second pipe 12 to the first pipe 11, the worker pulls the operating lever 5 through the handle so that the operating lever 5 drives the second mesh frame 31 to slide, and the second mesh frame 31 slides along the length direction of the first pipe 11 and away from the first mesh body 212. During the sliding process, the second mesh frame 31 pulls the two first mesh frames 211 to move through the two hinged rods 4, so that the two first mesh frames 211 rotate relative to the fixing frame 121. This process causes the two first mesh frames 211 to switch from the filtering position to the retreat position. The two first mesh frames 211 rotate to the retreat position. After that, the first mesh body 212 on the first mesh frame 211 no longer plays a filtering role, and the second mesh body 32 on the second mesh frame 31 plays a filtering role. At this time, the fan blades of the fan 1 can still be protected. For a period of time thereafter, the worker does not need to take out the filter for cleaning or replacement. It is worth mentioning that the first pipe 11 and the second pipe 12 are connected by a flange, and the fixing frame 121 is installed in the second pipe 12 by bolts. The sealing ring prevents the smoke from flowing between the first mesh frame 211 and the fixing frame 121 when the first mesh body 212 is filtering, and the smoke will not flow through the contact surface of the two first mesh frames 211.

[0026] Compared with the prior art, the utility model provides a boiler flue gas recirculation device. When the first filter screen 2 is blocked, the first filter screen 2 can be retreated to allow the second filter screen 3 to continue filtering the flue gas, so that the flue gas circulation is not hindered, thereby reducing the frequency of cleaning the filter screen or the frequency of replacing the filter screen and thus improving work efficiency.

[0027] Among them, the electric push rod 6 includes a shell 61 and an actuator rod 62. The shell 61 is fixedly installed on the outer casing of the fan 1, and the actuator rod 62 is fixedly connected to the operating rod 5. The electric push rod 6 can more accurately control the pulling force of the operating rod 5, so that the sliding rate of the second screen frame 31 can be accurately controlled, and the work of the worker is also convenient.

[0028] Among them, a pressure sensor 7 is provided on the second pipe 12. When a large amount of impurities accumulate on the first filter 2, the first filter 2 will hinder the circulation of smoke, and the air pressure value on one side of the first filter 2 will change. By observing the value of the pressure sensor 7, it is determined whether the first filter 2 needs to be switched from the filtering position to the retreat position.

[0029] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A boiler flue gas recirculation device, comprising a fan (1) and a first pipe (11) and a second pipe (12) that are connected to each other, wherein the air intake of the fan (1) is connected to the first pipe (11), and is characterized in that: Also includes: A first filter screen (2) is movably connected to the second pipe (12), and during the movement of the first filter screen (2), the first filter screen (2) has a filtering position for intercepting the filtering position in the second pipe (12) and a retreat position for avoiding and adhering to the inner wall of the second pipe (12); A second filter (3) is slidably connected to the first pipe (11) along the length of the first pipe (11); An operating rod (5) has one end fixedly connected to the second filter screen (3) and the other end extending through the outside of the first pipe (11). When the operating rod (5) is moved along the length of the first pipe (11), the second filter screen (3) can be driven to move along the first pipe (11). The second filter screen (3) drives the first filter screen (2) to switch from the filtering position to the retreat position through the connecting rod assembly.

2. The boiler flue gas recirculation device according to claim 1, characterized in that: A fixing frame (121) is fixedly installed in the second pipe (12), the first filter screen (2) includes at least one turning unit (21), the turning unit (21) includes a first screen frame (211) and a first screen body (212), the first screen frame (211) is rotatably connected to the fixing frame (121), and the first screen body (212) is fixedly connected to the first screen frame (211).

3. The boiler flue gas recirculation device according to claim 2, characterized in that: There are two flip units (21), and the connecting rod assembly includes two hinged rods (4). One end of the two hinged rods (4) is hinged to the second filter screen (3), and the other ends of the two hinged rods (4) are hinged to the two first screen frames (211) respectively.

4. The boiler flue gas recirculation device according to claim 1, characterized in that: The second filter screen (3) comprises a second screen frame (31) and a second screen body (32), wherein the second screen frame (31) is slidably connected in the first pipe (11), and the second screen body (32) is fixedly mounted on the second screen frame (31).

5. The boiler flue gas recirculation device according to claim 1, characterized in that: A handle is fixedly connected to the operating rod (5).

6. The boiler flue gas recirculation device according to claim 1, characterized in that: It also includes an electric push rod (6), which includes a housing (61) and an actuator rod (62). The housing (61) is fixedly mounted on the outer shell of the fan (1), and the actuator rod (62) is fixedly connected to the operating rod (5).

7. The boiler flue gas recirculation device according to claim 4, characterized in that: A sealing ring is provided on each of the two second net frames (31).

8. The boiler flue gas recirculation device according to claim 1, characterized in that: A pressure sensor (7) is provided on the second pipeline (12).

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