Adjustable door and ventilation device

Abstract

The application belongs to the technical field of ventilation equipment, and discloses an adjusting door and a ventilation device, wherein the adjusting door comprises a door body frame, a door leaf, a main shaft, a driving mechanism and a graphite joint bearing assembly. The door leaf is arranged inside the door body frame and is fixedly connected to the main shaft. The two ends of the main shaft are rotatably supported on the two side walls of the door body frame through the graphite joint bearing assemblies. The graphite joint bearing assembly comprises a bearing seat, a graphite joint bearing outer ring and a graphite joint bearing inner ring. The bearing seat is fixedly installed on the side wall of the door body frame, the graphite joint bearing outer ring is fixedly arranged in the bearing seat, the graphite joint bearing inner ring is sleeved on the end of the main shaft, and the outer spherical surface of the graphite joint bearing inner ring and the inner spherical surface of the graphite joint bearing outer ring form a spherical sliding fit and can release graphite particles when the two relative rotate. The output end of the driving mechanism is connected with the main shaft. The adjusting door completely solves the problem of grease failure in a high-temperature environment.

Description

Technical Field

[0001] This invention relates to the field of ventilation equipment technology, and more particularly to a regulating door and ventilation device. Background Technology

[0002] Control valves are widely used in industrial applications such as ventilation ducts, flue gas ducts, and boiler ducts for regulating medium flow, pressure, and controlling opening and closing. Traditional control valves typically use mounted bearings as rotating support components, but their shaft system structure has the following shortcomings during long-term operation: First, in high-temperature environments, the grease in mounted bearings is prone to volatilization and carbonization, leading to lubrication failure, increased bearing wear, and increased rotational resistance, which seriously affects the opening and closing flexibility and adjustment accuracy of the regulating gate.

[0003] Secondly, industrial pipelines often experience deformation and shaft misalignment due to factors such as thermal expansion and contraction and installation errors. Traditional rigid bearing structures cannot effectively compensate for these deviations, easily causing bearing jamming, shaft binding, and even preventing control valves from operating normally.

[0004] Third, although there are existing technologies that use spherical bearings for regulating doors, such as the connecting rods in flue gas dampers that are connected by spherical bearings, these spherical bearings are mostly spherical bearings that require regular lubrication. Under harsh working conditions such as high temperature and dust, lubrication conditions are difficult to guarantee, and the friction coefficient of spherical bearings is relatively large, which affects the flexibility of adjustment.

[0005] Fourth, the bearing structure of existing regulating gates is usually quite complex, making assembly and disassembly inconvenient and maintenance costs high.

[0006] Therefore, there is an urgent need for a regulating door and ventilation device to solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide a regulating door and ventilation device that can operate stably for a long time under harsh conditions such as high temperature and dust, requires no frequent maintenance, and has good self-aligning compensation capability.

[0008] To achieve this objective, the present invention adopts the following technical solution: An adjustable gate includes a gate frame, gate leaf, main shaft, drive mechanism, and graphite spherical bearing assembly; The door frame is connected to the pipe interface, the door leaf is set inside the door frame and fixedly connected to the main shaft, and the two ends of the main shaft are rotatably supported on the two side walls of the door frame through the graphite spherical bearing assembly. The graphite spherical bearing assembly includes a bearing housing, an outer ring of the graphite spherical bearing, and an inner ring of the graphite spherical bearing. The bearing housing is fixedly installed on the side wall of the door frame. The outer ring of the graphite spherical bearing is fixedly disposed inside the bearing housing. The inner ring of the graphite spherical bearing is sleeved on the end of the main shaft. The outer spherical surface of the inner ring of the graphite spherical bearing and the inner spherical surface of the outer ring of the graphite spherical bearing form a spherical sliding fit, and graphite particles can be released when the two rotate relative to each other. The output end of the drive mechanism is connected to the main shaft.

[0009] Preferably, a plurality of graphite blocks are embedded on the outer spherical surface of the inner ring of the graphite spherical bearing. The graphite blocks are evenly distributed on the outer spherical surface of the inner ring of the graphite spherical bearing, and the outer end faces of the plurality of graphite blocks are in sliding contact with the inner spherical surface of the outer ring of the graphite spherical bearing.

[0010] Preferably, the outer spherical surface of the inner ring of the graphite spherical bearing is provided with multiple mounting grooves, and the graphite block is embedded in the mounting groove or the graphite block is bonded to the mounting groove.

[0011] Preferably, the graphite spherical bearing assembly further includes dustproof sealing rings disposed at both ends of the bearing housing, wherein the inner edge of the dustproof sealing rings is in sealing contact with the outer wall of the spindle.

[0012] Preferably, a powder storage cavity is formed between the dustproof sealing ring and the friction surface of the outer ring of the graphite spherical bearing, and the powder storage cavity is pre-filled with graphite powder.

[0013] Preferably, the device also includes a graphite supply device, which includes a storage tube fixed to the door frame, a graphite rod placed inside the storage tube, and a spring. The spring can elastically press the graphite rod against the friction surface of the main shaft or the graphite spherical bearing assembly.

[0014] Preferably, the drive mechanism is connected to the main shaft via a linkage assembly, and both ends of the linkage assembly are provided with spherical bearings.

[0015] Preferably, a flexible filler is provided between the door frame and the pipe interface.

[0016] Preferably, the spindle has a stepped shaft structure, and both ends of the spindle are respectively provided with mounting journals that mate with the inner ring of the graphite spherical bearing.

[0017] A ventilation device includes a ventilation duct and the aforementioned regulating valve, wherein the end of the ventilation duct is provided with a pipe interface flange, and the regulating valve is fixedly connected to the pipe interface flange.

[0018] The beneficial effects of this invention are: The regulating gate provided by this invention utilizes a spherical sliding fit between the outer spherical surface of the inner ring of a graphite spherical bearing and the inner spherical surface of the outer ring of the graphite spherical bearing. When these two surfaces rotate relative to each other, graphite particles are released, giving the bearings in the regulating gate excellent high-temperature and corrosion resistance. This allows it to be used in harsh high-temperature operating conditions without the need for external grease, completely solving the problem of grease failure in high-temperature environments, significantly reducing maintenance workload. Furthermore, the self-lubricating properties of graphite effectively reduce friction and wear, extending service life. The structure is also compact and easy to assemble. Simultaneously, the spherical fit between the inner and outer rings not only accommodates slight runout of the main shaft under load and installation coaxiality errors, but also automatically compensates for shaft misalignment caused by pipe deformation and installation errors, preventing bearing jamming and ensuring flexible opening and closing of the regulating gate.

[0019] The ventilation device provided by the present invention, through the above-mentioned regulating door, can still ensure that the door leaf can rotate flexibly without jamming and without maintenance when conveying high-temperature dusty gas or humid flue gas, which greatly improves the operational reliability of the ventilation device, reduces unplanned downtime, extends the service life of the whole machine, and meets the needs of various harsh working conditions. Attached Figure Description

[0020] Figure 1 This is a front view of the regulating gate provided in an embodiment of the present invention; Figure 2 This is a side view of the regulating gate provided in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the graphite joint bearing assembly provided in an embodiment of the present invention; Figure 4 This is a structural diagram of the inner ring of the graphite spherical bearing provided in an embodiment of the present invention.

[0021] In the picture: 1. Door frame; 2. Door leaf; 3. Main shaft; 4. Graphite spherical bearing assembly; 41. Bearing housing; 42. Outer ring of graphite spherical bearing; 43. Inner ring of graphite spherical bearing; 431. Graphite block; 44. Dustproof sealing ring; 5. Drive mechanism; 6. Connecting rod assembly; 7. Flexible packing. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0026] like Figures 1 to 4 As shown, this embodiment provides an adjustable door, which includes a door frame 1, door leaf 2, main shaft 3, drive mechanism 5, and graphite spherical bearing assembly 4.

[0027] The door leaf 2 is located inside the door frame 1 and fixedly connected to the main shaft 3. Both ends of the main shaft 3 are rotatably supported on the side walls of the door frame 1 via graphite spherical bearing assemblies 4. The graphite spherical bearing assembly 4 includes a bearing seat 41, an outer ring 42, and an inner ring 43. The bearing seat 41 is fixedly installed on the side wall of the door frame 1, the outer ring 42 is fixedly disposed within the bearing seat 41, and the inner ring 43 is fitted onto the end of the main shaft 3. The outer spherical surface of the inner ring 43 and the inner spherical surface of the outer ring 42 form a spherical sliding fit, and graphite particles can be released when they rotate relative to each other. The output end of the drive mechanism 5 is connected to the main shaft 3.

[0028] Specifically, the door frame 1 is a rectangular frame structure. The door leaf 2 is a rectangular plate structure adapted to the inner cavity of the door frame 1, and the door leaf 2 is fixedly connected to the main shaft 3 by bolts. The main shaft 3 is horizontally arranged, and its two ends are rotatably supported on the left and right side walls of the door frame 1 by graphite spherical bearing assemblies 4. The drive mechanism 5 is an electric actuator, and its output end is connected to one end of the main shaft 3 for transmission. Of course, in some embodiments, the drive mechanism 5 can also be a pneumatic actuator.

[0029] The gate frame 1 forms the basic support structure for the rotating gate. The gate leaf 2, as the core adjusting element, is supported by the main shaft 3 and rotates with the gate leaf 2. The drive mechanism 5 is the actuation source. During the sliding friction of the inner ring 43 of the graphite spherical bearing, graphite particles are continuously released from the outer spherical surface, forming a stable solid lubricating film between the spherical mating surfaces, achieving self-lubrication. This allows the gate to operate reliably for a long time in high-temperature, dusty, or inconvenient maintenance environments. The overall structure is simple and has good assembly. The two ends of the main shaft 3 are supported on the two side walls, forming a double-support simple support structure, which can significantly improve the smoothness of the movement and adjustment accuracy of the gate leaf 2. Graphite spherical bearing assemblies 4 are symmetrically arranged on both sides to ensure the accurate alignment of the main shaft 3 and avoid additional friction and wear caused by uneven load. The bearing seat 41 provides a rigid positioning reference for the outer ring, ensuring the relative fixation of the outer ring and the frame; the inner ring is tightly fitted to the end of the main shaft 3, transmitting the torque of the main shaft 3 to the friction interface. The spherical fit between the inner and outer rings not only accommodates the slight runout of the spindle 3 under load and the installation coaxiality error, automatically compensates for shaft misalignment caused by pipeline deformation and installation errors, avoids bearing jamming, and ensures flexible opening and closing of the regulating gate, but also allows graphite particles to be continuously released during friction to form a solid lubricating film, eliminating the need for external grease and completely solving the problem of grease failure in high-temperature environments.

[0030] The regulating gate provided in this embodiment has excellent high-temperature resistance and corrosion resistance, making it suitable for harsh high-temperature operating conditions. It requires no external lubricant, completely solving the problem of lubricant failure in high-temperature environments, significantly reducing maintenance workload. Furthermore, the self-lubricating graphite effectively reduces friction and wear, extending service life. It also features a compact structure and is easy to assemble.

[0031] In some embodiments, such as Figure 3 and Figure 4As shown, multiple graphite blocks 431 are embedded on the outer spherical surface of the inner ring 43 of the graphite spherical bearing. The graphite blocks 431 are evenly distributed on the outer spherical surface of the inner ring 43, and the outer end faces of all graphite blocks 431 slide in contact with the inner spherical surface of the outer ring 42. The even distribution of multiple graphite blocks 431 on the outer spherical surface of the inner ring 43 ensures continuous lubrication in all areas of the graphite spherical bearing, avoiding localized dry friction. The direct contact between the outer end faces of the graphite blocks 431 and the inner spherical surface of the outer ring 42 forms a multi-point contact friction interface with reasonable contact stress, which is conducive to the rapid formation and stable maintenance of the graphite transfer film. Furthermore, even after the graphite blocks 431 wear, the embedded structure can continue to supply powder, effectively extending the service life of the spherical bearing while simplifying the overall manufacturing process and reducing costs.

[0032] In this embodiment, for example, the outer spherical surface of the inner ring 43 of the graphite spherical bearing is provided with multiple mounting grooves, and the graphite block 431 is embedded in or bonded to the mounting groove. It is understood that creating mounting grooves on the outer spherical surface of the inner ring provides precise space for the graphite block 431 to be received and positioned. Mechanically embedding the graphite block 431 in the mounting groove allows the groove wall to bear the shear force, preventing the graphite block 431 from falling off or rotating under the action of frictional torque.

[0033] Of course, in some other embodiments, the graphite block 431 can also be fixed in the mounting groove by adhesive bonding. Adhesive bonding can fill the gap between the graphite block 431 and the mounting groove, preventing loosening caused by the accumulation of wear debris in the groove, and also buffering micro-vibrations, protecting the graphite block 431 from breakage. Both methods can ensure reliable contact between the outer end face of the graphite block 431 and the inner spherical surface of the outer ring, ensuring the stability of solid lubrication.

[0034] Of course, in some other embodiments, a spiral lubrication groove can be formed on the outer spherical surface of the inner ring 43 of the graphite spherical bearing. The graphite blocks 431 are columnar and disposed within the spiral lubrication groove, and are evenly distributed along the spiral direction. The spiral lubrication groove helps the graphite particles to be more evenly distributed on the spherical mating surface, further improving the self-lubricating effect.

[0035] Furthermore, in some embodiments, such as Figure 3 As shown, the graphite spherical bearing assembly 4 also includes dustproof sealing rings 44 disposed at both ends of the bearing housing 41, with the inner edge of the dustproof sealing rings 44 in sealing contact with the outer wall of the spindle 3. Exemplarily, a sealing groove is provided at the end of the bearing housing 41, and the outer edge of the dustproof sealing rings 44 is embedded in the sealing groove. The fixing method of the dustproof sealing rings 44 is the same as that of the graphite block 431, and will not be described again here.

[0036] Understandably, the dustproof seal ring 44 is assembled at both ends of the bearing housing 41, forming a contact seal with the outer wall of the spindle 3. This effectively prevents external dust, moisture, or corrosive gases from entering the spherical friction pair without significantly increasing rotational resistance, thus preventing abrasive wear and chemical corrosion. Simultaneously, the seal ring also inhibits excessive leakage of internal graphite powder, maintaining the necessary solid lubricant reserve at the friction interface. This allows the bearing to maintain stable self-lubricating capability under harsh environments, significantly extending the maintenance-free cycle.

[0037] Furthermore, in some embodiments, a powder storage cavity is formed between the dustproof seal 44 and the friction surface of the outer ring 42 of the graphite spherical bearing, and the powder storage cavity is pre-filled with graphite powder. It is understood that the powder storage cavity is an annular accommodating space constructed using the gap between the dustproof seal 44 and the internal and external structures of the bearing. The pre-filled graphite powder can be quickly replenished to the friction interface during the initial rotation phase of the bearing, avoiding dry friction during startup and forming an initial transfer film. During operation, the cavity can also accommodate graphite particles continuously generated by friction and fine powder generated by normal wear, preventing them from leaking outwards and polluting the environment or clogging other components, and acting as a buffer and temporary storage area for solid lubricant, achieving a continuous and stable self-lubricating effect.

[0038] Furthermore, in some embodiments, the regulating door also includes a graphite supply device, which includes a storage tube fixed to the door frame 1, a graphite rod placed inside the storage tube, and a spring. The spring can elastically press the graphite rod against the friction surface of the main shaft 3 or the graphite joint bearing assembly 4.

[0039] Understandably, the graphite rod inside the storage tube continuously presses against the friction surface of the main shaft 3 or the bearing under the spring force. Once the graphite film on the friction surface thins due to consumption, the rod end is micro-weared, generating new graphite particles to replenish the friction interface. This method is not limited by rotation angle and speed, truly achieving long-term online self-lubrication, greatly reducing the maintenance needs of manual grease application or bearing replacement, and is especially suitable for operating conditions where frequent shutdowns are not possible.

[0040] In some embodiments, the drive mechanism 5 is connected to the main shaft 3 via a linkage assembly 6, with spherical bearings at both ends of the linkage assembly 6. That is, the linkage assembly 6 serves as an intermediate transmission component, with one end connected to the power output end of the drive mechanism 5 via a spherical bearing, and the other end connected to the main shaft 3 via a spherical bearing. The use of spherical bearings at both ends provides two interleaved rotational degrees of freedom, effectively compensating for installation misalignment of the drive mechanism 5, load deformation of the main shaft 3, and angular changes, preventing jamming or additional bending moments in the transmission path, and ensuring smooth torque transmission. The spherical bearings themselves can also be self-lubricating, adapting to the maintenance-free concept of the overall adjustable door, and improving the flexibility and reliability of the transmission process. Exemplarily, in this embodiment, the spherical bearings at both ends of the linkage assembly 6 are also graphite spherical bearings.

[0041] To further improve the performance in some embodiments, a flexible filler 7 is provided between the door frame 1 and the pipe interface.

[0042] Understandably, when a regulating valve is installed in a piping system, a flexible filler 7, such as a flexible graphite ring, asbestos rope, or high-temperature resistant fiber sealant, is inserted between its valve frame 1 and the pipe flange or interface. In this embodiment, the flexible filler 7 is a flexible graphite sealing filler. The flexible filler 7 can absorb the displacement caused by the thermal expansion and contraction of the pipeline and mechanical vibration, prevent stress concentration and frame deformation caused by rigid connections, effectively fill microscopic unevenness, block airflow leakage, improve system sealing efficiency and operating economy, and reduce noise.

[0043] In some embodiments, the main shaft 3 has a stepped shaft structure, and both ends of the main shaft 3 are respectively provided with mounting journals that mate with the inner ring 43 of the graphite spherical bearing. Specifically, in this embodiment, the bearing housing 41 is fixedly installed on the side wall of the door frame 1 by bolts, and the bearing housing 41 has a mounting cavity. The outer ring 42 of the graphite spherical bearing is interference-fitted and fixed in the mounting cavity of the bearing housing 41. The inner ring 43 of the graphite spherical bearing is sleeved on the mounting journal at the end of the main shaft 3, and the two are fixed by a key connection or interference fit.

[0044] Understandably, designing the main shaft 3 as a stepped shaft, with a thicker middle section to ensure strength and rigidity, and mounting journals with reduced diameters at both ends for precise positioning of the inner ring 43 of the graphite spherical plain bearing. Axial positioning using the shaft shoulders prevents the inner ring 43 of the graphite spherical plain bearing from shifting under axial force, ensuring the spherical friction pair is always correctly aligned. The stepped structure also facilitates the sequential assembly and disassembly of the bearing and related parts, reducing manufacturing and maintenance complexity.

[0045] This embodiment also provides a ventilation device, including a ventilation duct and the aforementioned regulating valve. A pipe interface flange is provided at the end of the ventilation duct. The regulating valve is fixedly connected to the pipe interface flange. The ventilation device provided in this embodiment can precisely control the airflow. Furthermore, due to its self-lubricating graphite spherical bearings and sealing structure, it can ensure that the valve leaf 2 rotates flexibly without jamming and requires no maintenance when conveying high-temperature dusty gas or humid flue gas. This significantly improves the operational reliability of the ventilation device, reduces unplanned downtime, extends the overall lifespan of the machine, and meets the needs of various harsh operating conditions.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A regulating gate, characterized in that, It includes a door frame (1), door leaf (2), main shaft (3), drive mechanism (5) and graphite joint bearing assembly (4); The door frame (1) is connected to the pipe interface, the door leaf (2) is set inside the door frame (1) and fixedly connected to the main shaft (3), and the two ends of the main shaft (3) are rotatably supported on the two side walls of the door frame (1) by the graphite joint bearing assembly (4); The graphite spherical bearing assembly (4) includes a bearing housing (41), a graphite spherical bearing outer ring (42), and a graphite spherical bearing inner ring (43). The bearing housing (41) is fixedly installed on the side wall of the door frame (1). The graphite spherical bearing outer ring (42) is fixedly installed inside the bearing housing (41). The graphite spherical bearing inner ring (43) is sleeved on the end of the main shaft (3). The outer spherical surface of the graphite spherical bearing inner ring (43) and the inner spherical surface of the graphite spherical bearing outer ring (42) form a spherical sliding fit and can release graphite particles when they rotate relative to each other. The output end of the drive mechanism (5) is connected to the main shaft (3).

2. The regulating gate according to claim 1, characterized in that, Multiple graphite blocks (431) are embedded on the outer spherical surface of the inner ring (43) of the graphite spherical bearing. The graphite blocks (431) are evenly distributed on the outer spherical surface of the inner ring (43) of the graphite spherical bearing, and the outer end faces of the multiple graphite blocks (431) are in sliding contact with the inner spherical surface of the outer ring (42) of the graphite spherical bearing.

3. The regulating gate according to claim 1, characterized in that, The graphite spherical bearing inner ring (43) has multiple mounting grooves on its outer spherical surface. The graphite block (431) is embedded in the mounting groove or is bonded to the mounting groove.

4. The regulating gate according to claim 1, characterized in that, The graphite spherical bearing assembly (4) also includes dustproof sealing rings (44) disposed at both ends of the bearing housing (41), the inner edge of the dustproof sealing rings (44) being in sealing contact with the outer wall of the main shaft (3).

5. The regulating gate according to claim 4, characterized in that, A powder storage cavity is formed between the dustproof sealing ring (44) and the friction surface of the outer ring of the graphite spherical bearing, and the powder storage cavity is pre-filled with graphite powder.

6. The regulating gate according to claim 1, characterized in that, It also includes a graphite supply device, which includes a storage tube fixed to the door frame (1), a graphite rod placed in the storage tube, and a spring. The spring can elastically press the graphite rod against the friction surface of the main shaft (3) or the graphite joint bearing assembly (4).

7. The regulating gate according to claim 1, characterized in that, The drive mechanism (5) is connected to the main shaft (3) via a connecting rod assembly (6), and both ends of the connecting rod assembly (6) are provided with spherical bearings.

8. The regulating gate according to claim 1, characterized in that, Flexible filler (7) is provided between the door frame (1) and the pipe interface.

9. The regulating gate according to claim 1, characterized in that, The main shaft (3) has a stepped shaft structure, and both ends of the main shaft (3) are respectively provided with mounting journals that cooperate with the inner ring (43) of the graphite spherical bearing.

10. A ventilation device, characterized in that, It includes a ventilation duct and a regulating valve as described in any one of claims 1-9, wherein the end of the ventilation duct is provided with a pipe interface flange, and the regulating valve is fixedly connected to the pipe interface flange.

Images