A gear-linked air heater heating surface rotation transmission structure

Abstract

The invention discloses a gear-linked air heater heating surface rotation transmission structure, relates to the technical field of air heaters, comprises an air heater shell and a heating panel, the invention directly installs a circumferential gear on the inlet shaft tube of the air heater heating panel, inputs power through the sliding rack, push-pull screw and linear electric actuator matched therewith, drives the heating surface to rotate, six rollers are installed in the rack slideway to ensure the free sliding of the rack, the rack slideway is independently installed on the same air heater shell, the sliding racks are connected by push-pull screws, the push-pull screw and the sliding rack are hinged, which can not only accommodate the accuracy change caused by the longitudinal deformation of the shell, but also absorb the standard error caused by on-site assembly of the split air heater, the linear electric actuator is installed in the middle of one of the screws, and the synchronous rotation of each heating surface of the boiler air heater by 0-180° is realized by controlling the number of revolutions of the linear actuator.

Description

Technical Field

[0001] The invention relates to the technical field of air heaters, in particular to a gear-linked air heater heating surface rotation transmission structure. Background Art

[0002] Boiler heaters are the mainstream equipment for ensuring the air preheater inlet temperature of northern power plant boilers. In recent years, they have been vigorously promoted and developed. Especially after the widespread application of ammonia denitrification technology, in order to reduce the degree of scaling and corrosion of air preheaters, the requirements for its inlet temperature are more stringent. Therefore, boiler heaters have been more widely promoted and popularized. At the same time, in order to improve the operating economy of the unit and reduce the air duct resistance during the heater outage season, drawer-type heaters and 90° rotating heaters have been developed based on the original fixed heaters. Drawer-type heaters have extremely high requirements for manufacturing processes and installation space, which greatly limits their scope of application. 90° rotating air heaters mostly use a pull rod to pull the swing arm of the stator on the rotating shaft to rotate the heated surface. Since the pull rod and the swing arm combined transmission device is restricted by the bracket and the rotating shaft, the heated surface cannot rotate 0-180°. Therefore, current technologies mostly limit the rotation angle of the heating surface of the heater to 0-90°. The two sides of the heating surface of a 90° rotating air heater cannot be used alternately as the windward side. Long-term operation will not only deposit a large amount of light dirt, affecting the wind resistance of the heater during use, but also greatly reduce the service life of the heater. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a gear-linked air heater heating surface rotation transmission structure, which solves the technical problems that the rotation angle of the existing air heater heating surface is limited to 0-90° and cannot be rotated 0-180°, and the two sides of the heating surface of the 90° rotary air heater cannot be used alternately as the windward side. Long-term operation will not only deposit a large amount of light dirt, affecting the wind resistance of the air heater during use, but also greatly shorten the service life of the air heater.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a gear-linked heater heating surface rotation transmission structure, including a heater shell and a heating panel, the upper wall of the heater shell is equipped with an inlet rotating shaft tube, the lower end rotating shaft is installed on the lower wall of the heater shell, the two ends of the heating panel respectively penetrate the upper and lower walls of the heater shell, the heating panel is movably connected to the heater shell through the inlet rotating shaft tube and the lower end rotating shaft, a circumferential large gear is fixedly installed on the inlet rotating shaft tube, and the upper wall of the heater shell and located at A rack slide is fixedly installed on one side of the circumferential large gear, a roller is fixedly installed in the rack slide, a sliding rack is slidably installed on the rack slide through the roller, the sliding rack is meshingly connected to the circumferential large gear, hinge pairs are fixedly installed on both ends of the sliding rack, a push-pull screw is hinged between the sliding racks through the hinge pairs, a support frame is fixedly installed on the upper wall of the heater shell and above one of the push-pull screws, a linear electric actuator is fixedly installed on the support frame, and the driving end of the linear electric actuator is meshingly connected to the push-pull screw.

[0005] Preferably, the number of the rollers is at least 6.

[0006] Preferably, the width of the sliding rack is 70 mm, and the effective stroke of the sliding rack is 447.68 mm.

[0007] Preferably, the tooth width of the circumferential gear is 30 mm, the module of the circumferential gear is 5 mm, and the number of teeth of the circumferential gear is 57.

[0008] Preferably, the diameter of the push-pull screw is 48 mm, and the pitch of the push-pull screw is 8 mm.

[0009] Preferably, the output speed of the linear electric actuator is 24 rpm.

[0010] Preferably, the output thrust of the linear electric actuator is not less than 100 KN.

[0011] Beneficial Effects

[0012] The present invention provides a gear-linked heating surface rotation transmission structure for a heater, which solves the technical problem that the rotation angle of the existing heating surface of the heater is limited to 0-90 degrees, and it is impossible to rotate 0-180 degrees. The two sides of the heating surface of the 90-degree rotating heater cannot be used alternately as the windward surface. Long-term operation will not only cause a large amount of light dirt to be deposited, affecting the wind resistance during the use of the heater, but also greatly shortening the service life of the heater. The present invention directly installs a circumferential gear on the inlet shaft tube of the heater panel, and inputs a sliding rack, a push-pull screw and a linear electric actuator that cooperate with the circumferential gear. The power drives the inlet rotating shaft tube, the lower rotating shaft and the heated panel to rotate. Six rollers are installed in the rack slide to ensure the free sliding of the rack. The rack slide is independently installed on the same heater shell. The sliding racks are connected by push-pull screws. The push-pull screws and the sliding racks are hinged, which can not only accommodate the accuracy changes caused by the longitudinal deformation of the shell, but also absorb the standard error of the split heater caused by on-site assembly. The linear electric actuator is installed in the middle of one of the screws. The synchronous rotation of each heating surface of the boiler heater from 0 to 180° is achieved by controlling the number of revolutions of the linear actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The diagram is a top view of the rotating transmission structure of the heating surface of a gear-linked air heater according to the present invention.

[0014] Figure 2 The present invention is a schematic structural diagram of a gear-linked air heater heating surface rotation transmission structure.

[0015] Figure 3 The figure is a side structural schematic diagram of a gear-linked air heater heating surface rotation transmission structure according to the present invention.

[0016] In the figure: 1-heater housing; 2-heating panel; 3-inlet rotating shaft tube; 4-lower end rotating shaft; 5-circumferential large gear; 6-rack slideway; 7-roller; 8-sliding rack; 9-hinge pair; 10-push-pull screw; 11-support frame; 12-linear electric actuator. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-3The present invention provides a technical solution: a gear-linked heater heating surface rotation transmission structure, comprising a heater shell 1 and a heating panel 2, wherein an inlet rotating shaft tube 3 is installed on the upper wall of the heater shell 1, and a lower end rotating shaft 4 is installed on the lower wall of the heater shell 1, and the two ends of the heating panel 2 respectively penetrate the upper and lower walls of the heater shell 1, and the heating panel 2 is movably connected with the heater shell 1 through the inlet rotating shaft tube 3 and the lower end rotating shaft 4, and a circumferential large gear 5 is fixedly installed on the inlet rotating shaft tube 3, and a rack slide 6 is fixedly installed on the upper wall of the heater shell 1 and on one side of the circumferential large gear 5, and a roller 7 is fixedly installed in the rack slide 6, and a sliding rack 8 is slidably installed on the rack slide 6 through the roller 7, and the sliding rack 8 is meshed with the circumferential large gear 5, and the two ends of the sliding rack 8 are respectively fixedly installed with hinge pairs 9, and the sliding A push-pull screw 10 is hingedly connected between the racks 8 through a hinge pair 9, a support frame 11 is fixedly installed on the upper wall of the heater housing 1 and above one of the push-pull screws 10, a linear electric actuator 12 is fixedly installed on the support frame 11, and the driving end of the linear electric actuator 12 is meshed and connected with the push-pull screw 10, the number of the rollers 7 is at least 6, the width of the sliding rack 8 is 70mm, the effective stroke of the sliding rack 8 is 447.68, mm, the tooth width of the circumferential gear 5 is 30mm, the module of the circumferential gear 5 is 5mm, the number of teeth of the circumferential gear 5 is 57, the diameter of the push-pull screw 10 is 48mm, the pitch of the push-pull screw 10 is 8mm, the output speed of the linear electric actuator 12 is 24rpm, and the output thrust of the linear electric actuator 12 is not less than 100KN.

[0019] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and a suitable controller should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and does not explain the electrical control.

[0020] Embodiment: According to the drawings of the specification, when in use, the initial position of the linear electric actuator 12 is in the state of the first windward surface of the heating panel 2 of the heater, that is, 0°, the stroke of the sliding rack 8 is 0mm, and the output speed of the linear electric actuator 12 is the stroke of the sliding rack 8÷the pitch of the push-pull screw 10. When the output speed of the linear electric actuator 12 is 27.98 revolutions, the push-pull screw 10 moves, and then pushes the sliding rack 8 to move under the action of the rack slideway 6 and the roller 7. The stroke of the sliding rack 8 is 223. 84mm, at this time, due to the meshing connection between the sliding rack 8 and the circumferential large gear 5, the circumferential large gear 5 rotates, and the rotation angle of the circumferential large gear 5 is 90°, thereby driving the inlet rotating shaft tube 3 to rotate. At this time, the heating panel 2 of the heater rotates under the action of the inlet rotating shaft tube 3 and the lower end rotating shaft 4. At this time, the heating panel 2 is in an inactive state. When the output speed of the linear electric actuator 12 is 24 revolutions, the stroke of the sliding rack 8 is 447.68mm. At this time, the second windward side of the heating surface is in the engaged state, that is, the 180° position.

[0021] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A gear-linked air heater heating surface rotation transmission structure, comprising an air heater housing (1) and a heating panel (2), It is characterized in that An inlet rotating shaft tube (3) is installed on the upper wall of the heater shell (1), and a lower end rotating shaft (4) is installed on the lower wall of the heater shell (1). The two ends of the heating panel (2) respectively penetrate the upper and lower walls of the heater shell (1), and the heating panel (2) is movably connected to the heater shell (1) through the inlet rotating shaft tube (3) and the lower end rotating shaft (4). A circumferential large gear (5) is fixedly installed on the inlet rotating shaft tube (3). A rack slideway (6) is fixedly installed on the upper wall of the heater shell (1) and located on one side of the circumferential large gear (5). A roller (7) is fixedly installed in the rack slideway (6). The rack slideway (6) is slidably mounted with a sliding rack (8) via a roller (7); the sliding rack (8) is meshingly connected to the circumferential gear (5); hinge pairs (9) are fixedly mounted at both ends of the sliding rack (8); a push-pull screw (10) is hingedly connected between the sliding racks (8) via the hinge pair (9); a support frame (11) is fixedly mounted on the upper wall of the heater housing (1) and located above one of the push-pull screws (10); a linear electric actuator (12) is fixedly mounted on the support frame (11); a driving end of the linear electric actuator (12) is meshingly connected to the push-pull screw (10).

2. A gear-linked air heater heating surface rotation transmission structure according to claim 1, Features , the number of the rollers (7) is at least 6.

3. A gear-linked air heater heating surface rotation transmission structure according to claim 1, Features The width of the sliding rack (8) is 70 mm, and the effective stroke of the sliding rack (8) is 447.68 mm.

4. A gear-linked air heater heating surface rotation transmission structure according to claim 1, Features The tooth width of the circumferential large gear (5) is 30 mm, the module of the circumferential large gear (5) is 5 mm, and the number of teeth of the circumferential large gear (5) is 57.

5. The gear-linked air heater heating surface rotation transmission structure according to claim 1, Features The diameter of the push-pull screw (10) is 48 mm, and the pitch of the push-pull screw (10) is 8 mm.

6. A gear-linked air heater heating surface rotation transmission structure according to claim 1, Features The output speed of the linear electric actuator (12) is 24 rpm.

7. A gear-linked air heater heating surface rotation transmission structure according to claim 1, Features , the output thrust of the linear electric actuator (12) is not less than 100 KN.

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