Boiler air heater

Abstract

The boiler air heater comprises a box body, a plurality of heat conduction pipes and a cleaning mechanism, the box body is provided with a first partition plate and a second partition plate so as to divide the box body into an air inlet cavity, a heat exchange cavity and an air outlet cavity, and the heat conduction pipes are arranged in the box body at intervals; one end of the heat conduction pipe penetrates through the first partition plate to be communicated with the air inlet cavity, and the other end of the heat conduction pipe penetrates through the second partition plate to be communicated with the air outlet cavity. The multiple cleaning assemblies are connected to the frame body and each comprise a scraping piece, and the scraping pieces make contact with the outer wall of the heat conduction pipe; and the driving device is used for driving the frame body to move so as to drive the scraping piece to move in the axial direction of the heat conduction pipe. By means of the technical scheme, the boiler air heater can clean dust accumulated on the outer wall of the heat conduction pipe.

Description

Technical Field

[0001] The present disclosure relates to the technical field of boiler auxiliary equipment, and in particular, to a boiler air heater. Background Art

[0002] The boiler air heater is a heat exchanger that uses low-pressure steam extraction from the steam turbine to heat the air inlet of the air preheater. Usually, the boiler air heater is installed between the blower outlet and the air preheater inlet, so it is also called a pre-mounted air preheater.

[0003] In the related art, the patent document with publication number CN218119792U provides a boiler air heater that enables a superconducting heat pipe and a steam header to rotate inside an air box to reduce the probability of dust accumulation on the surface of the superconducting heat pipe and increase the service life of the boiler air heater.

[0004] However, during the long-term use of the device, the air usually contains stains that can adhere to the surface of the superheat pipe, such as cobwebs, oil smoke or other floccules, which cannot be removed by rotating the superheat pipe, thereby affecting the thermal efficiency of the boiler heater. Utility Model Content

[0005] The purpose of the present disclosure is to provide a boiler air heater, which can clean the dirt accumulated on the outer wall of the heat conduction pipe.

[0006] In order to achieve the above-mentioned purpose, the present disclosure provides a boiler air heater, which includes a box body, a plurality of heat-conducting pipes and a cleaning mechanism. The box body is provided with a first partition plate and a second partition plate to divide the box body into an air inlet chamber, a heat exchange chamber and an air outlet chamber. The plurality of heat-conducting pipes are arranged in the box body at intervals, and one end of the heat-conducting pipe passes through the first partition plate to communicate with the air inlet chamber, and the other end passes through the second partition plate to communicate with the air outlet chamber. The cleaning mechanism includes: a frame body; a plurality of cleaning components, which are connected to the frame body and each include a scraper, which contacts the outer wall of the heat-conducting pipe; and a driving device, which is used to drive the frame body to move so as to drive the scraper to move along the axial direction of the heat-conducting pipe.

[0007] Optionally, the driving device is constructed as a motor, which is fixedly mounted on the box and located outside the box. The cleaning mechanism also includes a transmission structure, which includes a screw and a connecting nut. The screw is arranged parallel to the heat pipe, and one end of the screw is transmission-connected to the output shaft of the motor and the other end extends to the heat exchange chamber. The connecting nut is fixedly connected to the frame.

[0008] Optionally, the cleaning assembly includes a fixing ring and an adjusting device, wherein the fixing ring is sleeved on the outside of the heat-conducting pipe and fixed to the frame, and the scraper is adjustably mounted on the fixing ring through the adjusting device, and the adjusting device is used to adjust the distance between the scraper and the heat-conducting pipe.

[0009] Optionally, the adjusting device includes a connecting piece and a bolt, the connecting piece is constructed as an L-shaped connecting block, the L-shaped connecting block includes a first part and a second part that are connected, the first part extends along the radial direction of the fixing ring and is connected to the fixing ring, the second part extends along the axial direction of the fixing ring and is provided with a second threaded hole, and one end of the bolt passes through the second threaded hole and is fixedly connected to the scraper.

[0010] Optionally, the cleaning assembly includes a transmission device arranged on the fixed ring, and the scraper is rotatably mounted on the fixed ring through the transmission device, the transmission device includes a rack, a first gear, a second gear, a third gear and a universal joint, the rack is arranged parallel to the axial direction of the heat pipe, and the two ends of the rack are respectively fixed to the first partition plate and the second partition plate, the first gear is meshed with the rack and rotates synchronously with the second gear through the universal joint, the second gear is meshed with the third gear, the scraper is fixedly connected to the third gear, the third gear is sleeved on the outside of the heat pipe and is rotatably connected to the fixed ring, so that the scraper can move circumferentially along the heat pipe.

[0011] Optionally, the frame body includes a connecting bracket, a first bracket and a second bracket, the connecting bracket is connected to the connecting nut, the first bracket and the second bracket are arranged on the connecting bracket at intervals, the second bracket is located below the first bracket, the cleaning component is connected to the first bracket, and the cleaning mechanism includes a material receiving device, and the material receiving device is fixed on the second bracket.

[0012] Optionally, the material receiving device includes a material receiving tray and a connecting block, the material receiving tray is connected to the second bracket via the connecting block, and the material receiving tray is provided with an opening, and the opening is located below the heat conducting pipe.

[0013] Optionally, the material receiving tray includes a material receiving trough and a top cover, the material receiving trough is formed with the opening, the connecting block connects the top cover and the second bracket, and the top cover is slidably connected to the material receiving trough for opening or closing the opening.

[0014] Optionally, the material receiving device also includes an elastic member, a connecting ear is provided on the top cover, one end of the elastic member is fixed to the connecting ear, and the other end is fixed to the material receiving trough, and an abutment rod is provided on the connecting ear, one end of the abutment rod is fixed to the connecting ear, and the other end extends toward the first partition plate or the second partition plate and can abut against the first partition plate or the second partition plate.

[0015] Optionally, the box body is provided with a first channel, a second channel, a third channel and a fourth channel, the first channel is connected to the air inlet cavity, the second channel is connected to the air outlet cavity, the third channel and the fourth channel are respectively connected to the heat exchange cavity and are correspondingly arranged on both sides of the heat exchange cavity.

[0016] Through the above technical solution, in the boiler air heater provided by the present invention, a plurality of heat-conducting tubes are arranged in the box body, a plurality of cleaning components are connected to the frame body and are provided with scraping members in contact with the outer walls of the heat-conducting tubes, and the frame body is driven by the driving device to move along the axial direction of the heat-conducting tube, thereby driving the scraping members to move, so that since the scraping members are in contact with the outer walls of the heat-conducting tubes, the dust accumulated on the outer walls of the heat-conducting tubes can be cleaned during the movement of the scraping members.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0019] Figure 1 is a schematic structural diagram of a boiler air heater provided in an embodiment of the present disclosure;

[0020] Figure 2 is a schematic cross-sectional view of a boiler air heater provided by an embodiment of the present disclosure;

[0021] Figure 3 It is a schematic structural diagram of a driving device, a frame and a material receiving device provided in an embodiment of the present disclosure;

[0022] Figure 4 It is a partial structural schematic diagram of the cleaning component provided in an embodiment of the present disclosure.

[0023] Description of Reference Numerals

[0024] 100-box; 110-first partition plate; 120-second partition plate; 131-inlet cavity; 132-heat exchange cavity; 133-outlet cavity; 140-first channel; 150-second channel; 160-third channel; 170-fourth channel; 200-heat pipe; 300-driving device; 410-screw rod; 420-connecting nut; 510-fixing ring; 520-connecting piece; 530-screw Bolt; 540-scraper; 610-first gear; 620-second gear; 630-third gear; 640-universal joint; 650-rack; 710-connecting bracket; 720-first bracket; 730-second bracket; 800-material receiving device; 810-connecting block; 820-material receiving trough; 821-opening; 830-top cover; 831-connecting ear; 840-elastic member; 850-abutment rod. DETAILED DESCRIPTION

[0025] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] In the present disclosure, unless otherwise stated, directional words such as "upper and lower" generally refer to the relative "upper and lower" in the direction of gravity when the corresponding parts are in use, and "inside and outside" generally refer to the "inside and outside" relative to the corresponding parts' own contours. The terms "first" and "second" and the like are used to distinguish one element from another and do not have order or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be construed as limitations on the present disclosure.

[0027] According to the specific implementation scheme provided by the present disclosure, Figures 1 to 4 As shown in, a boiler heater is provided, including a box body 100, a plurality of heat-conducting pipes 200 and a cleaning mechanism. The box body 100 is provided with a first partition plate 110 and a second partition plate 120 to divide the box body 100 into an air inlet chamber 131, a heat exchange chamber 132 and an air outlet chamber 133. The plurality of heat-conducting pipes 200 are arranged at intervals in the box body 100, and one end of the heat-conducting pipe 200 passes through the first partition plate 110 to communicate with the air inlet chamber 131, and the other end passes through the second partition plate 120 to communicate with the air outlet chamber 133. The cleaning mechanism includes: a frame; a plurality of cleaning components, the plurality of cleaning components are connected to the frame and each includes a scraper 540, the scraper 540 is in contact with the outer wall of the heat-conducting pipe 200; and a driving device 300, the driving device 300 is used to drive the frame to move, so as to drive the scraper 540 to move along the axial direction of the heat-conducting pipe 200.

[0028] Through the above technical solution, in the boiler air heater provided by the present invention, a plurality of heat-conducting pipes 200 are arranged in the box body 100, a plurality of cleaning components are connected to the frame body and are provided with scraping members 540 in contact with the outer walls of the heat-conducting pipes 200, and the frame body is driven by the driving device 300 to move along the axial direction of the heat-conducting pipes 200, thereby driving the scraping members 540 to move, so that since the scraping members 540 are in contact with the outer walls of the heat-conducting pipes 200, the dust accumulated on the outer walls of the heat-conducting pipes 200 can be cleaned during the movement of the scraping members 540.

[0029] In the boiler air heater provided in the present disclosure, the frame can achieve the purpose of axial movement along the heat pipe 200 in any suitable manner, and the present disclosure does not impose any specific restrictions on this. Figure 1 and Figure 2 As shown in , the driving device 300 can be constructed as a motor, which is fixedly mounted on the housing 100 and is located outside the housing 100. The cleaning mechanism can also include a transmission structure, which includes a screw 410 and a connecting nut 420. The screw 410 is arranged parallel to the heat pipe 200, and one end of the screw 410 is connected to the output shaft of the motor, and the other end extends to the heat exchange chamber 132. The connecting nut 420 is fixedly connected to the frame. In this way, the motor is turned on and the screw 410 is driven to rotate by the motor. Since the connecting nut 420 is screwed to the screw 410 and connected to the frame, when the screw 410 rotates, the connecting nut 420 can drive the frame to move along the axial direction of the screw 410, that is, the purpose of axial movement of the frame along the heat pipe 200 is achieved. In addition, the setting of the motor and the screw rod 410 also facilitates the reciprocating motion of the frame along the axial direction of the screw rod 410. When the motor is turned on, the screw rod 410 rotates and drives the frame to move from one end of the screw rod 410 to the other end. When the motor is controlled to reverse, the screw rod 410 rotates in the opposite direction and drives the frame to move from the other end of the screw rod 410 back to its original position.

[0030] In some other embodiments, the driving device 300 may also be constructed as a linear module or a cylinder, etc. The driving shaft of the linear module or the cylinder is directly connected to the frame to drive the frame to move. The present disclosure does not impose any specific limitations on this.

[0031] In the boiler air heater provided by the present disclosure, the cleaning component can be constructed in any suitable form, and the present disclosure does not impose any specific limitation on this. Figure 1 , Figure 3 and Figure 4As shown in , the cleaning assembly may include a fixing ring 510 and an adjusting device. The fixing ring 510 may be sleeved on the outside of the heat-conducting pipe 200 and fixed to the frame. The scraper 540 may be adjustably mounted on the fixing ring 510 through the adjusting device. The adjusting device is used to adjust the distance between the scraper 540 and the heat-conducting pipe 200. In this way, when the dirt accumulated on the outer wall of the heat-conducting pipe 200 is too thick, the scraper 540 is adjusted away from the heat-conducting pipe 200 through the adjusting device to avoid the problem that the scraper 540 is difficult to move due to the thick dirt. Correspondingly, when the dirt accumulated on the outer wall of the heat-conducting pipe 200 is too thin, the scraper 540 is adjusted close to the heat-conducting pipe 200 through the adjusting device to avoid the problem that the scraper 540 is difficult to scrape thoroughly due to the thin dirt.

[0032] The adjusting device may be constructed in any suitable form to adjust the distance between the scraper 540 and the heat pipe 200, and the present disclosure does not impose any specific limitation on this. Figure 4 As shown in , the adjustment device may include a connector 520 and a bolt 530. The connector 520 may be constructed as an L-shaped connector block. The L-shaped connector block includes a first portion and a second portion connected to each other. The first portion may extend along the radial direction of the fixing ring 510 and be connected to the fixing ring 510. The second portion may extend along the axial direction of the fixing ring 510 and be provided with a second threaded hole. One end of the bolt 530 passes through the second threaded hole and is fixedly connected to the scraper 540. The scraper 540 is connected to the connector 520 by the bolt 530. On the one hand, when the position of the scraper needs to be adjusted, the bolt 530 only needs to be rotated. The bolt 530 can drive the scraper 540 to move up and down relative to the connector 520 to achieve the purpose of adjusting the position of the scraper 540. On the other hand, the arrangement of the bolt 530 and the connector 520 being screwed together can keep the scraper 540 at the current position after the bolt 530 is rotated to adjust the position of the scraper 540, so as to facilitate cleaning the outer wall of the heat pipe 200.

[0033] In the boiler air heater provided by the present disclosure, the scraper 540 can achieve the purpose of rotating along the circumferential direction of the heat pipe 200 in any suitable manner, and the present disclosure does not impose any specific limitation on this. Figure 1 and Figure 4As shown in, the cleaning component may include a transmission device arranged on the fixed ring 510, and the scraper 540 can be rotatably mounted on the fixed ring 510 through the transmission device. The transmission device includes a rack 650, a first gear 610, a second gear 620, a third gear 630 and a universal joint 640. The rack 650 can be arranged parallel to the axial direction of the heat pipe 200, and the two ends of the rack 650 are respectively fixed to the first partition plate 110 and the second partition plate 120. The first gear 610 is meshed with the rack 650 and rotates synchronously with the second gear 620 through the universal joint 640. The second gear 620 is meshed with the third gear 630. The scraper 540 is fixedly connected to the third gear 630. The third gear 630 is sleeved on the outside of the heat pipe 200 and is rotatably connected to the fixed ring 510, so that the scraper 540 can move circumferentially along the heat pipe 200. When the fixing ring 510 moves along the axial direction of the heat conducting tube 200 driven by the frame, the first gear 610 also moves along the axial direction of the heat conducting tube 200 driven by the fixing ring 510. Since the rack 650 is arranged along the axial direction of the heat conducting tube 200 and the first gear 610 is meshed with the rack 650, the first gear 610 can rotate around its own axis while moving along the axial direction of the heat conducting tube 200. The second gear 620 is connected to the first gear 610 through the universal joint 640 so as to be able to move synchronously with the first gear 610. The third gear 630 is meshed with the second gear 620 and is sleeved on the outside of the heat-conducting pipe 200, so that the scraper 540 can rotate along the circumferential direction of the heat-conducting pipe 200 under the drive of the second gear 620. The scraper 540 is fixed to the third gear 630, that is, the scraper 540 can move along the axial direction of the heat-conducting pipe 200 and the circumferential direction of the heat-conducting pipe 200 at the same time. In this way, by adjusting the scraper 540 to contact the outer wall of the heat-conducting pipe 200, the outer wall of the heat-conducting pipe 200 can be cleaned in all directions.

[0034] It needs to be explained here that the "universal joint 640" is a mechanical device that can realize variable-angle power transmission. It can connect two transmission shafts in different directions and allow the two connected transmission shafts to rotate on mutually perpendicular planes. In the present disclosure, the first gear 610 can drive the second gear 620 to rotate along an axis different from it. The present disclosure does not involve changes to the principle and structure of the universal joint 640, so it will not be elaborated here.

[0035] In the boiler air heater provided in the present disclosure, the frame can be constructed in any suitable form, and the present disclosure does not impose any specific limitation on this. Figure 1 and Figure 3As shown in , the frame may include a connecting bracket 710, a first bracket 720 and a second bracket 730, the connecting bracket 710 is connected to the connecting nut 420, the first bracket 720 and the second bracket 730 can be arranged on the connecting bracket 710 at intervals, the second bracket 730 is located below the first bracket 720, and the cleaning component is connected to the first bracket 720. Usually, the number of heat conduction pipes 200 in the boiler heater is multiple and evenly arranged in the heat exchange cavity 132, and multiple fixing rings 510 are respectively sleeved on the outside of the heat conduction pipe 200, and the first bracket 7 20 fixes together a plurality of fixing rings 510 arranged along the length extension direction of the first bracket 720 to facilitate synchronous movement of a plurality of cleaning components. In addition, the number of first brackets 720 can also be designed to be multiple according to the actual installation situation of the heat transfer pipe 200 in the boiler heater. The plurality of first brackets 720 are connected together by a connecting bracket 710 to fix together a plurality of fixing rings 510 arranged along the length extension direction of the connecting bracket 710 to facilitate synchronous movement of a plurality of cleaning components. In this way, synchronous movement of all cleaning components is achieved.

[0036] As an exemplary embodiment, reference is made to Figure 1 and Figure 3 As shown in the figure, the cleaning mechanism can also include a material receiving device 800, which is fixed on the second bracket 730. Since the second bracket 730 is located below the first bracket 720, that is, the material receiving device 800 is located below the cleaning mechanism. In this way, when the cleaning mechanism cleans the outer wall of the heat pipe 200 driven by the frame, the dust and dirt scraped off from the outer wall of the heat pipe 200 by the scraping member 540 can fall into the material receiving device 800, so that the staff can collect and process the dust and dirt in a unified manner.

[0037] In the boiler air heater provided in the present disclosure, the material receiving device 800 can be constructed in any suitable form, and the present disclosure does not impose any specific limitation on this. Figure 3 As shown in the figure, the material receiving device 800 may include a material receiving tray and a connecting block 810, the material receiving tray is connected to the second bracket 730 via the connecting block 810, and the material receiving tray may be provided with an opening 821, the opening 821 is located below the heat conducting pipe 200, so that the dust and dirt attached to the outer wall of the heat conducting pipe 200 can fall into the material receiving tray through the opening 821 on the material receiving tray after being scraped off by the scraping member 540, so as to be easily collected.

[0038] The receiving tray can be constructed in any suitable form, and the present disclosure does not impose any specific restrictions on this. As an exemplary embodiment, the receiving tray can include a receiving trough 820 and a top cover 830, the receiving trough 820 is formed with an opening 821, the connecting block 810 connects the top cover 830 and the second bracket 730, the top cover 830 can be slidably connected to the receiving trough 820 for opening or closing the opening 821, and the sliding connection between the top cover 830 and the receiving trough 820 can close the opening 821 of the receiving trough 820 when appropriate, so as to prevent the dust and dirt collected in the receiving trough 820 from escaping and affecting the cleaning effect.

[0039] In the boiler air heater provided in the present disclosure, the top cover 830 can realize the opening and closing of the opening 821 of the docking trough 820 in any suitable manner, and the present disclosure does not make any specific restrictions on this. As an exemplary embodiment, refer to Figure 1 and Figure 3 As shown in , the material receiving device 800 may also include an elastic member 840, a connecting ear 831 is provided on the top cover 830, the elastic member 840 can be fixed to the connecting ear 831 at one end and fixed to the material receiving trough 820 at the other end, and an abutment rod 850 is provided on the connecting ear 831, the abutment rod 850 can be fixed to the connecting ear 831 at one end and extend toward the first partition plate 110 or the second partition plate 120 at the other end and can abut against the first partition plate 110 or the second partition plate 120. When it is necessary to close the opening 821 of the material receiving trough 820, the control frame is moved toward the first partition plate 110, and one end of the abutting rod 850 first contacts the first partition plate 110, and the control frame continues to move toward the first partition plate 110. The abutting rod 850 can push the top cover 830 toward the material receiving trough 820 through the connecting ear 831 to close the opening 821. At this time, the elastic member 840 is compressed; when it is necessary to open the opening 821 of the material receiving trough 820, the control frame is moved away from the first partition plate 110, and one end of the abutting rod 850 is away from the first partition plate 110. At this time, the elastic member 840 moves toward the original state and then pushes the top cover 830 away from the material receiving trough 820 through the connecting ear 831 to open the opening 821, thereby realizing the selective opening and closing of the opening 821 of the material receiving trough 820.

[0040] In the boiler air heater provided in the present disclosure, as an exemplary embodiment, reference is made to Figure 1As shown in , the housing 100 may also be provided with a first channel 140, a second channel 150, a third channel 160 and a fourth channel 170. The first channel 140 is in communication with the air inlet cavity 131, the second channel 150 is in communication with the air outlet cavity 133, the third channel 160 and the fourth channel 170 are respectively in communication with the heat exchange cavity 132 and are correspondingly arranged on both sides of the heat exchange cavity 132. Usually, when the boiler air heater is in use, hot air providing heat is passed into the heat conduction pipe 200, and air to be heated is passed into the heat exchange cavity 132. Therefore, the first channel 140 is in communication with the air inlet cavity 131, the second channel 150 is in communication with the air outlet cavity 133, and the two ends of the plurality of heat conduction pipes 200 are respectively in communication with the air inlet cavity 131 and the air outlet cavity 133. In this way, the hot air can be continuously passed through the air inlet cavity 131 through the first channel 140, and the hot air can enter the air outlet cavity 133 through the heat conduction pipe 200. The air to be heated contacts the outer wall of the heat pipe 200 in the heat exchange cavity 132 to achieve heat transfer therebetween, and then passes out from the other of the third channel 160 or the fourth channel 170 to achieve heating of the air to be heated.

[0041] In summary, when the boiler air heater provided by the present invention is in use, the motor is first turned on to drive the frame to move axially along the heat-conducting pipe 200. The frame is fixedly connected to the fixing ring 510 and a scraper 540 is provided on the fixing ring 510, that is, the scraper 540 can move axially along the heat-conducting pipe 200 under the drive of the fixing ring 510. In addition, the cleaning mechanism also includes a rack 650, which is arranged along the axial direction of the heat-conducting pipe 200. The third gear 630 is rotatably connected to the fixing ring 510 and is sleeved on the outside of the heat-conducting pipe 200, and the third gear 630 can rotate circumferentially along the heat-conducting pipe 200 under the action of the first gear 610, the second gear 620 and the universal joint 640. The scraper 540 is fixed on the third gear 630. In this way, the scraper 540 can move along the axial direction of the heat-conducting pipe 200 while also moving circumferentially along the heat-conducting pipe 200 to achieve all-round cleaning of the outer wall of the heat-conducting pipe 200.

[0042] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0044] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A boiler air heater, It is characterized in that The boiler air heater comprises a box, a plurality of heat-conducting pipes and a cleaning mechanism, wherein the box is provided with a first partition plate and a second partition plate to divide the box into an air inlet cavity, a heat exchange cavity and an air outlet cavity, a plurality of the heat-conducting pipes are arranged in the box at intervals, and one end of the heat-conducting pipe passes through the first partition plate to communicate with the air inlet cavity, and the other end passes through the second partition plate to communicate with the air outlet cavity, and the cleaning mechanism comprises: Frame; A plurality of cleaning components, each of which is connected to the frame and comprises a scraper, wherein the scraper contacts the outer wall of the heat conducting pipe; and A driving device is used to drive the frame to move so as to drive the scraper to move along the axial direction of the heat conducting pipe.

2. The boiler air heater according to claim 1, It is characterized in that The driving device is constructed as a motor, which is fixedly mounted on the box and located outside the box. The cleaning mechanism also includes a transmission structure, which includes a screw and a connecting nut. The screw is arranged parallel to the heat pipe, and one end of the screw is transmission-connected to the output shaft of the motor and the other end extends to the heat exchange chamber. The connecting nut is fixedly connected to the frame.

3. The boiler air heater according to claim 1, It is characterized in that The cleaning assembly includes a fixing ring and an adjusting device. The fixing ring is sleeved on the outside of the heat-conducting pipe and fixed to the frame. The scraper is adjustably mounted on the fixing ring through the adjusting device. The adjusting device is used to adjust the distance between the scraper and the heat-conducting pipe.

4. The boiler air heater according to claim 3, It is characterized in that The adjusting device includes a connecting piece and a bolt, the connecting piece is constructed as an L-shaped connecting block, the L-shaped connecting block includes a first part and a second part connected to each other, the first part extends along the radial direction of the fixing ring and is connected to the fixing ring, the second part extends along the axial direction of the fixing ring and is provided with a second threaded hole, one end of the bolt passes through the second threaded hole and is fixedly connected to the scraper.

5. The boiler air heater according to claim 2, It is characterized in that The frame body includes a connecting bracket, a first bracket and a second bracket, the connecting bracket is connected to the connecting nut, the first bracket and the second bracket are arranged on the connecting bracket at intervals, the second bracket is located below the first bracket, and the cleaning component is connected to the first bracket. The cleaning mechanism comprises a material receiving device, and the material receiving device is fixed on the second bracket.

6. The boiler air heater according to claim 5, It is characterized in that The material receiving device comprises a material receiving tray and a connecting block, the material receiving tray is connected to the second bracket via the connecting block, and the material receiving tray is provided with an opening, and the opening is located below the heat conducting pipe.

7. The boiler air heater according to claim 6, It is characterized in that The material receiving tray comprises a material receiving trough and a top cover, the material receiving trough is formed with the opening, the connecting block connects the top cover and the second bracket, and the top cover is slidably connected to the material receiving trough for opening or closing the opening.

8. The boiler air heater according to claim 7, It is characterized in that The material receiving device also includes an elastic member, and a connecting ear is provided on the top cover, one end of the elastic member is fixed to the connecting ear, and the other end is fixed to the material receiving trough, and an abutment rod is provided on the connecting ear, one end of the abutment rod is fixed to the connecting ear, and the other end extends toward the first partition plate or the second partition plate and can abut against the first partition plate or the second partition plate.

9. The boiler air heater according to any one of claims 1 to 8, It is characterized in that The box body is provided with a first channel, a second channel, a third channel and a fourth channel, the first channel is connected to the air inlet cavity, the second channel is connected to the air outlet cavity, the third channel and the fourth channel are respectively connected to the heat exchange cavity and are correspondingly arranged on both sides of the heat exchange cavity.

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