Axial flow fan tail cone manhole

Abstract

According to the tail cone manhole of the axial flow fan, a manhole door lock pin assembly is flexibly adjusted to guarantee reliable locking of a manhole door assembly, the efficiency of opening and closing the manhole door assembly is improved, an air pull rod provides auxiliary pull force, an operator can easily open and close the manhole door assembly, and the situation that the manhole door assembly suddenly falls due to lack of support when the manhole door assembly is opened is avoided; the operation difficulty is reduced and the safety is improved. According to the main technical scheme, according to the axial flow fan tail cone manhole, a manhole door frame assembly is used for being connected with a fan tail cone shell, and the manhole door frame assembly comprises a center opening; the manhole door assembly is movably connected with the manhole door frame assembly, and the manhole door assembly is used for moving to cover or open the central opening; the manhole door lock pin assembly is movably connected with the manhole door frame assembly, when the manhole door lock pin assembly is located at the locking position, the manhole door lock pin assembly acts with the manhole door assembly to limit the manhole door assembly to the position covering the center opening, and when the manhole door lock pin assembly is located at the loosening position, the manhole door lock pin assembly is disengaged from the manhole door assembly. The axial flow fan is mainly applied to the axial flow fan needing to be provided with the manhole.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, and in particular to a tail cone manhole for an axial flow fan. Background Technology

[0002] Large axial flow fans, as key components in large-scale wind tunnel testing equipment, have very large geometric dimensions, with fan diameters reaching 7 meters or even larger. During operation, the moving parts of these fans, such as motors and bearings, require regular maintenance and repair when malfunctions occur. These operations necessitate personnel accessing the drive motor and rotor system inside the axial flow fan. Therefore, manholes are typically provided in the fan's tail cone casing, allowing personnel to enter the casing and reach the drive motor and rotor system.

[0003] The tail cone of a large axial flow fan is typically located high above the bottom of the internal flow channel, requiring the manhole to be positioned directly below the tail cone for easy access. Currently, the most common manhole structure for large axial flow fans is the ordinary hinged pivot manhole, located at the bottom of the tail cone and secured by a ring of bolts around the manhole door's edge. However, this manhole structure presents several problems in terms of ease of installation and operation, as well as safety: 1. The numerous bolts and nuts on the outer side of the tail cone shell disrupt the continuity of the shell surface, causing localized disruption to the flow field and reducing its quality; 2. The conventional bolt and nut connection lacks effective locking, making it prone to loosening under prolonged vibration. If nuts, washers, or other components fall off, they can be blown downstream by the fan, impacting downstream testing equipment and specimens at high speed and causing serious damage; 3. Opening the manhole requires operators to tilt their heads back and disassemble all bolts sequentially, making the operation cumbersome. Utility Model Content

[0004] In view of this, in order to solve at least one of the above-mentioned technical problems, this utility model provides an axial flow fan tail cone manhole equipped with a manhole door locking pin assembly, which can be flexibly adjusted to ensure that the manhole door assembly is reliably locked, improve the efficiency of opening and closing the manhole door assembly, reduce the difficulty of operation, and improve the overall safety.

[0005] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0006] This utility model embodiment provides a tail cone manhole for an axial flow fan, including:

[0007] Manhole door frame assembly (1), manhole door assembly (2) and manhole door lock pin assembly (3);

[0008] The manhole frame assembly (1) is used to connect to the fan tail cone housing (6), and the manhole frame assembly (1) includes a central opening (101);

[0009] The manhole door assembly (2) is movably connected to the manhole door frame assembly (1), and the manhole door assembly (2) is used to move to cover or open the central opening (101);

[0010] The manhole door lock pin assembly (3) is movably connected to the manhole door frame assembly (1). The manhole door lock pin assembly (3) has a locked position and an open position. When locked, the manhole door lock pin assembly (3) acts on the manhole door assembly (2) and restricts the manhole door assembly (2) to a position covering the central opening (101). When open, the manhole door lock pin assembly (3) disengages from the manhole door assembly (2). The force-applying end of the manhole door lock pin assembly (3) is used to apply external force to move the manhole door lock pin assembly (3) between the locked position and the open position.

[0011] The manhole door frame assembly (1) includes a frame body and a manhole door lock pin mounting base (110);

[0012] The frame body is used to fix to the inner surface of the tail cone shell (6) of the wind turbine, and the frame body has a central opening (101);

[0013] There are two manhole door lock pin mounting seats (110). The two manhole door lock pin mounting seats (110) are symmetrically arranged on the frame body with respect to the central opening (101). The first end of the manhole door lock pin mounting seat (110) protrudes from the side of the frame body used to connect the fan tail cone housing (6). The manhole door lock pin mounting seat (110) is used to pass through the clearance hole of the fan tail cone housing (6) so that the first end of the manhole door lock pin mounting seat (110) is located outside the fan tail cone housing (6).

[0014] The manhole door lock pin mounting base (110) includes an inner hole, the manhole door lock pin assembly (3) passes through the inner hole, and the force-applying end of the manhole door lock pin assembly (3) is exposed outside the fan tail cone housing (6) through the manhole door lock pin mounting base (110).

[0015] The manhole door lock pin assembly (3) includes a lock cylinder shaft (31), a fastening nut (32), and a lock plate (33);

[0016] The lock cylinder shaft (31) is rotatably inserted into the inner hole of the manhole door lock pin mounting seat (110), the lock plate (33) is sleeved with the lock cylinder shaft (31), and the lock plate (33) and the lock cylinder shaft (31) are circumferentially limited. The fastening nut (32) is screwed to the lock cylinder shaft (31) to fix the lock plate (33).

[0017] The lock cylinder (31) includes a force-applying end, and the lock plate (33) includes a locked position and an unlocked position.

[0018] The axial flow fan tail cone manhole also includes:

[0019] First lock cylinder cotter pin (7) and second lock cylinder cotter pin (8);

[0020] The force-applying end of the lock cylinder (31) is provided with an inner force-applying hole (311), and the side wall of the inner force-applying hole is provided with a first pin hole (312). The manhole door lock pin mounting seat (110) is provided with a first positioning hole (111). The first lock cylinder cotter pin (7) is inserted into the first pin hole (312) and the first positioning hole (111) to limit the circumferential movement of the lock cylinder (31) and the manhole door lock pin mounting seat (110), thereby limiting the lock plate (33) to the locked position.

[0021] A second pin hole (313) is provided on the threaded section connecting the lock cylinder (31) and the fastening nut (32), and at least one second positioning hole (321) is provided on the fastening nut (32). The second lock cylinder cotter pin (8) is inserted into the second pin hole (313) and the second positioning hole (321) to limit the circumferential movement of the lock cylinder (31) and the fastening nut (32).

[0022] The manhole door lock pin assembly (3) also includes a wedge-shaped lock block (34), at least one adjusting shim (35), and a screw (36);

[0023] The upper surface of the wedge-shaped locking block (34) includes a planar region (341) and an inclined region (342). The inclined region (342) is used to act against the edge of the manhole door assembly (2) when the locking plate (33) moves from the loose position to the locked position and is embedded below the partial structure of the manhole door assembly (2). The planar region (341) is used to abut against the lower part of the partial structure of the manhole door assembly (2) when the locking plate (33) is in the locked position.

[0024] An adjusting shim (35) is located between the wedge-shaped locking block (34) and the locking plate (33), and a screw (36) is used to connect and fix the wedge-shaped locking block (34), the adjusting shim (35) and the locking plate (33).

[0025] The manhole door frame assembly (1) also includes a handrail (11). There are two handrails (11). The two handrails (11) are symmetrically arranged on the frame body relative to the central opening (101), and the handrails (11) are perpendicular to the frame body.

[0026] The axial flow fan tail cone manhole also includes:

[0027] There are two gas rods (4). The two gas rods (4) are symmetrically arranged on the manhole door frame assembly (1) with respect to the central opening (101) and connected to the manhole door assembly (2). The gas rods (4) are used to provide tension to the manhole door assembly (2).

[0028] The axial flow fan tail cone manhole also includes:

[0029] The pin (5) and the manhole door assembly (2) include at least one rotating arm (22) and a door body;

[0030] The rotating arm (22) is fixed on the door body. The rotating arm (22) is connected to the manhole door frame assembly (1) through the pin (5). The rotating arm (22) is provided with a limiting protrusion (221). The limiting protrusion (221) is used to interact with the manhole door frame assembly (1) to limit the maximum opening angle of the door body.

[0031] The main body of the door includes an outer panel (25), a door panel (26), and supporting ribs;

[0032] The outer panel (25) and the door panel (26) are spaced apart, with the edge of the outer panel (25) extending to the outside of the door panel (26), and the support ribs located between the outer panel (25) and the door panel (26);

[0033] When the manhole door assembly (2) covers the central opening (101), the door panel (26) is embedded in the central opening (101), the outer panel (25) is attached to the outer surface of the manhole door frame assembly (1), and the outer panel (25) and the outer surface of the fan tail cone housing (6) are located in the same arc surface.

[0034] The door panel (26) is provided with a weight-reducing opening. When the manhole door lock pin assembly (3) is in the locked position, the manhole door lock pin assembly (3) abuts against the side of the door panel (26) opposite to the outer panel (25), thereby restricting the manhole door assembly (2) to the position covering the central opening (101).

[0035] The manhole door assembly (2) also includes an upper fixing clamp (23) for the telescopic ladder, an upper fixing seat (24) for the telescopic ladder, and a lower fixing seat (29) for the telescopic ladder.

[0036] The upper fixed seat (24) of the telescopic ladder is connected to the door body, and the upper fixed clamp (23) of the telescopic ladder is detachably connected to the upper fixed seat (24) of the telescopic ladder and is used to cooperate with the upper fixed seat (24) of the telescopic ladder to clamp the crossbeam of the highest step of the telescopic ladder.

[0037] The lower fixing seat (29) of the telescopic ladder is located on the side of the door body away from the upper fixing seat (24) of the telescopic ladder, and is used to connect the straps to fix the lowest level of the telescopic ladder.

[0038] This utility model provides a tail cone manhole for an axial flow fan. The manhole door assembly is connected to the manhole door frame assembly, and the manhole door locking pin assembly is adjusted to the locked position to fix the manhole door assembly, thus closing the central opening. When it is necessary to open the central opening, the position of the manhole door assembly can be adjusted to the loosened position without disassembling the manhole door assembly. Firstly, since the manhole door locking pin assembly does not need to be removed from the manhole door frame assembly, its connection is firm and strong, eliminating the need for a large number of manhole door locking pin assemblies; for example, only two are required. This design avoids the problems of numerous bolts and nuts on the outer side of the tail cone shell in existing technologies, which disrupt the continuity of the tail cone shell surface, cause localized damage to the flow field, and reduce flow field quality. On the other hand, the structural design of the manhole door locking pin assembly allows for pin-limiting, thereby solving the problem of conventional bolt and nut connection structures lacking effective locking and being prone to loosening under long-term vibration, posing potential safety hazards. Furthermore, the reduced number of manhole door locking pin assemblies also reduces the operational complexity of opening and closing the manhole door assembly, improving work efficiency. Attached Figure Description

[0039] Figure 1 A schematic diagram of a portion of the structure of the tail cone manhole and the tail cone housing of an axial flow fan provided in this embodiment of the utility model;

[0040] Figure 2 A cross-sectional structural schematic diagram of a manhole for the tail cone of an axial flow fan and a partial structure of the tail cone housing of the fan, provided for an embodiment of this utility model;

[0041] Figure 3 A schematic diagram of the structure of a manhole door frame assembly in the tail cone manhole of an axial flow fan provided in this embodiment of the present invention;

[0042] Figure 4 A schematic diagram of the structure of a manhole door lock pin assembly in the tail cone manhole of an axial flow fan provided for an embodiment of this utility model;

[0043] Figure 5 A schematic diagram of the structure of the locking core shaft in the manhole of the tail cone of an axial flow fan provided in this embodiment of the utility model;

[0044] Figure 6 A schematic diagram of the structure of a manhole door assembly in the tail cone manhole of an axial flow fan provided in this embodiment of the present invention;

[0045] Figure 7 A schematic diagram of the structure of the telescopic ladder in the storage state when the axial flow fan tail cone manhole and the telescopic ladder are combined, as provided in the embodiment of this utility model;

[0046] Figure 8A schematic diagram of the structure of an axial flow fan tail cone manhole and telescopic ladder in the pulled-out state when they are combined, as provided in an embodiment of this utility model;

[0047] Figure 9 This is a schematic diagram illustrating an application scenario of an axial flow fan provided by an embodiment of the present utility model. Detailed Implementation

[0048] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of an axial flow fan tail cone manhole proposed according to this utility model.

[0049] like Figure 1-2 As shown, this embodiment of the present invention provides a tail cone manhole (10) for an axial flow fan, comprising:

[0050] Manhole door frame assembly (1), manhole door assembly (2) and manhole door lock pin assembly (3);

[0051] The manhole frame assembly (1) is used to connect to the fan tail cone housing (6), and the manhole frame assembly (1) includes a central opening (101);

[0052] The manhole door assembly (2) is movably connected to the manhole door frame assembly (1), and the manhole door assembly (2) is used to move to cover or open the central opening (101);

[0053] The manhole door lock pin assembly (3) is movably connected to the manhole door frame assembly (1). The manhole door lock pin assembly (3) has a locked position and an open position. When locked, the manhole door lock pin assembly (3) acts on the manhole door assembly (2) and restricts the manhole door assembly (2) to a position covering the central opening (101). When open, the manhole door lock pin assembly (3) disengages from the manhole door assembly (2). The force-applying end of the manhole door lock pin assembly (3) is used to apply external force to move the manhole door lock pin assembly (3) between the locked position and the open position.

[0054] like Figure 9 As shown, the axial flow fan tail cone manhole (10) is used to install on the fan tail cone housing (6). The axial flow fan (100) is set in the air duct (500) to provide axial flow air to the air duct (500). The fan tail cone housing (6) has an approximately conical structure with a smaller cross section away from the front housing (the purpose is to optimize the flow field). The axial flow fan tail cone manhole (10) can be set at a low position on the fan tail cone housing (6) close to the bottom of the air duct (500), that is, close to the front housing, and at the bottom of the fan tail cone housing (6) for easy operation and access for personnel.

[0055] An installation opening is provided on the fan tail cone housing (6). The manhole door assembly (2) is installed inside the fan tail cone housing (6) and connected to the inner wall of the fan tail cone housing (6). If welding is possible, the installation opening on the fan tail cone housing (6) corresponds to the central opening (101). More specifically, the edge of the installation opening is located on the outer periphery of the edge of the central opening (101), that is, the installation opening is larger than the central opening (101). The manhole door assembly (2) and the manhole door frame assembly (1) can be connected by hinges, such as by a pin connection, which will be described in detail later with reference to specific embodiments. The manhole door assembly (2) is movably connected to the manhole door frame assembly (1). One side of the manhole door assembly (2) is rotatably connected to the manhole door frame assembly (1). The manhole door assembly (2) can then be rotated to cover or open the central opening (101), thereby closing the central opening (101) and the fan tail cone housing (6), or opening the central opening (101) for operators to enter.

[0056] The manhole door lock pin assembly (3) is rotatably connected to the manhole door frame assembly (1). The manhole door lock pin assembly (3) remains connected to the manhole door frame assembly (1) in both the locked and unlocked positions. In the locked position, the manhole door lock pin assembly (3) abuts against the manhole door assembly (2), such as by inserting it below the door panel (26) of the manhole door assembly (2), thereby limiting the manhole door assembly (2) through the supporting door panel (26). In the unlocked position, the manhole door lock pin assembly (3) disengages from the manhole door assembly (2), such as from the door panel (26), allowing the manhole door assembly (2) to open. The force-applying end of the manhole door lock pin assembly (3) refers to the end used by the operator to apply force to rotate the manhole door lock pin assembly (3). After the axial flow fan tail cone manhole (10) is installed, the force-applying end of the manhole door lock pin assembly (3) is located on the outside of the fan tail cone housing (6), thereby enabling the operator to adjust the manhole door lock pin assembly (3) to achieve position change.

[0057] The structure of the manhole door locking pin assembly (3) can be varied, and further examples will be given below. There can be two manhole door locking pin assemblies (3), located on opposite sides of the central opening (101) and away from the end where the manhole door assembly (2) is rotatably connected to the manhole door frame assembly (1), thereby limiting the manhole door assembly (2) in multiple positions.

[0058] For ease of explanation, in the following embodiments, the actual direction of the axial flow fan during use will be used as an example to describe the specific implementation structure of the tail cone manhole (10) of the axial flow fan.

[0059] This utility model provides a tail cone manhole for an axial flow fan. The manhole door assembly is connected to the manhole door frame assembly, and the manhole door locking pin assembly is adjusted to the locked position to fix the manhole door assembly, thus closing the central opening. When it is necessary to open the central opening, the position of the manhole door assembly can be adjusted to the loosened position without disassembling the manhole door assembly. Firstly, since the manhole door locking pin assembly does not need to be removed from the manhole door frame assembly, its connection is firm and strong, eliminating the need for a large number of manhole door locking pin assemblies; for example, only two are required. This design avoids the problems of numerous bolts and nuts on the outer side of the tail cone shell in existing technologies, which disrupt the continuity of the tail cone shell surface, cause localized damage to the flow field, and reduce flow field quality. On the other hand, the structural design of the manhole door locking pin assembly allows for pin-limiting, thereby solving the problem of conventional bolt and nut connection structures lacking effective locking and being prone to loosening under long-term vibration, posing potential safety hazards. Furthermore, the reduced number of manhole door locking pin assemblies also reduces the operational complexity of opening and closing the manhole door assembly, improving work efficiency.

[0060] In one implementation, such as Figure 3 As shown, the manhole door frame assembly (1) includes a frame body and a manhole door lock pin mounting seat (110). The frame body is used to fix to the inner surface of the fan tail cone housing (6), and the frame body has a central opening (101). There are two manhole door lock pin mounting seats (110), which are symmetrically arranged on the frame body relative to the central opening (101). The first end of the manhole door lock pin mounting seat (110) protrudes from the side of the frame body used to connect to the fan tail cone housing (6), and the manhole door lock pin mounting seat (110) is used to pass through the clearance hole of the fan tail cone housing (6) so that the first end of the manhole door lock pin mounting seat (110) is located outside the fan tail cone housing (6). The manhole door lock pin mounting base (110) includes an inner hole, the manhole door lock pin assembly (3) passes through the inner hole, and the force-applying end of the manhole door lock pin assembly (3) is exposed outside the fan tail cone housing (6) through the manhole door lock pin mounting base (110).

[0061] The main frame structure is designed to ensure structural strength while being easy to manufacture and lightweight. Specifically, the main frame includes a manhole door frame panel (13), a first manhole door frame transverse side plate (15), a vertical stiffener plate (16), a top panel (17), a manhole door frame longitudinal side plate (18), and a second manhole door frame transverse side plate (19). The manhole door frame panel (13) has the aforementioned central opening (101) as a passage manhole. The surface shape of the manhole door frame panel (13) is adapted to the surface shape of the fan tail cone shell (6), and the lower surface of the manhole door frame panel (13) is attached to the steel plate on the inner surface of the fan tail cone shell (6). The first manhole frame transverse side panel (15) and the second manhole frame transverse side panel (19) are located on both sides of the manhole frame panel (13) in the first direction. There are two manhole frame longitudinal side panels (18), which are located on both sides of the manhole frame panel (13) in the second direction. The first manhole frame transverse side panel (15), the second manhole frame transverse side panel (19), and the manhole frame longitudinal side panel (18) are all perpendicularly connected to the manhole frame panel (13). The two sides of the manhole frame longitudinal side panel (18) are fixed to the first manhole frame transverse side panel (15) and the second manhole frame transverse side panel (19). There are two top panels (17), which are spaced apart from the manhole frame panel (13) in the vertical direction, and the two top panels (17) are connected to the two manhole frame longitudinal side panels (18) respectively. It is understandable that the upper panel (17) is a narrow strip plate, which will not obstruct the central opening (101). There are multiple vertical stiffeners (16), which are located between the upper panel (17) and the manhole frame panel (13), and between the first manhole frame transverse side panel (15), the second manhole frame transverse side panel (19) and the manhole frame panel (13). The manhole frame panel (13), the first manhole frame transverse side panel (15), the vertical stiffeners (16), the upper panel (17), the manhole frame longitudinal side panel (18), and the second manhole frame transverse side panel (19) are all made of thin steel plates and are fixedly connected to each other by welding to increase the overall rigidity of the manhole frame.

[0062] The manhole door lock pin mounting base (10) is a cylindrical structure, symmetrically arranged with a central opening (101) on both sides. A typical recommended structural form is shown in the attached diagram. Figure 3 The second end surface of the manhole door lock pin mounting base (10) is slightly higher than the upper panel (17), and the first end of the manhole door lock pin mounting base (10) is lower than the manhole door frame panel (13). Figure 2 The inner hole of the manhole door lock pin mounting base (10) is a stepped hole, which will be further explained in conjunction with the manhole door lock pin assembly (3) later.

[0063] In one implementation, such as Figure 2 , Figure 4 , Figure 5As shown, the manhole door lock pin assembly (3) includes a lock cylinder (31), a fastening nut (32), and a lock plate (33). The lock cylinder (31) is rotatably inserted into the inner hole of the manhole door lock pin mounting base (110). The lock plate (33) is sleeved with the lock cylinder (31), and the lock plate (33) is circumferentially limited by the lock cylinder (31). The fastening nut (32) is screwed to the lock cylinder (31) to fix the lock plate (33). The lock cylinder (31) includes a force-applying end, and the lock plate (33) includes a locked position and a released position.

[0064] Furthermore, the axial flow fan tail cone manhole also includes: a first lock core shaft cotter pin (7) and a second lock core shaft cotter pin (8). The force-applying end of the lock core shaft (31) is provided with an inner force-applying hole (311), and the side wall of the inner force-applying hole is provided with a first pin hole (312). The manhole door lock pin mounting seat (110) is provided with a first positioning hole (111). The first lock core shaft cotter pin (7) is inserted into the first pin hole (312) and the first positioning hole (111) to limit the circumferential movement of the lock core shaft (31) and the manhole door lock pin mounting seat (110), thereby restricting the lock piece (33) to the locked position. A second pin hole (313) is provided on the threaded section connecting the lock cylinder (31) and the fastening nut (32), and at least one second positioning hole (321) is provided on the fastening nut (32). The second lock cylinder cotter pin (8) is inserted into the second pin hole (313) and the second positioning hole (321) to limit the circumferential movement of the lock cylinder (31) and the fastening nut (32).

[0065] The lock cylinder shaft (31) has an approximately cylindrical structure with a stepped surface. Correspondingly, the inner hole of the manhole door lock pin mounting base (110) is also stepped, including a large-diameter section at the bottom and a small-diameter section at the top. The lower part of the lock cylinder shaft (31) is a cylinder with an internal hexagonal hole. The internal force-applying hole (311) is the internal hexagonal hole at the lower end of the lock cylinder shaft (31), and a first pin hole (312) is provided on a specific side of the internal hexagonal hole. The first positioning hole (111) is opened in the large diameter section. The position of the first positioning hole (111) matches the position of the first pin hole (312) of the lock cylinder shaft (31). After the manhole door assembly (2) closes the central opening (101) and adjusts the manhole door lock pin assembly (3) to the locked position, the first lock cylinder shaft cotter pin (7) is inserted into the first positioning hole (111) and the first pin hole (312) to lock the lock cylinder shaft (31). This can completely prevent the manhole door lock pin assembly (3) from loosening due to vibration or other factors, and prevent the manhole door assembly (2) from opening abnormally. The middle part of the lock cylinder shaft (31) is cylindrical, and the outer diameter is smaller than the lower cylindrical area of ​​the lock cylinder shaft (31). The upper middle section of the lock cylinder (31) is a square cross-section. A square hole is provided on the lock plate (33). The lock plate (33) is fitted into the square cross-section through the square hole, thereby achieving circumferential limiting and allowing the lock cylinder (31) to drive the lock plate (33) to rotate. The uppermost end of the lock cylinder (31) is a threaded section, which is fitted with a fastening nut (32). The cylindrical area in the middle of the lock cylinder (31) is rotatably connected to the small diameter section of the manhole door lock pin mounting seat (110), and the cylindrical area at the bottom of the lock cylinder (31) is rotatably connected to the large diameter section of the manhole door lock pin mounting seat (110). This allows the lock cylinder (31) to be vertically limited by a step, and with the fastening nut (32), the lock cylinder (31) is vertically limited. The threaded section is provided with a second pin hole (313), which, together with the second lock core shaft cotter pin (8), can prevent the fastening nut (32) from loosening and completely avoid the locking plate (33) from loosening during use.

[0066] The locking plate (33) has a bent structure with straight sections at both ends parallel to each other. One of the two straight sections has the aforementioned square hole, and the other has a through hole for screws. In one embodiment, the manhole door lock pin assembly (3) further includes a wedge-shaped locking block (34), at least one adjusting shim (35), and a screw (36). The upper surface of the wedge-shaped locking block (34) includes a planar area (341) and a sloped area (342). The sloped area (342) is used to act against the edge of the manhole door assembly (2) when the locking plate (33) moves from the loose position to the locked position, and is embedded under a portion of the structure of the manhole door assembly (2). The planar area (341) is used to abut against the underside of a portion of the structure of the manhole door assembly (2) when the locking plate (33) is in the locked position. An adjusting shim (35) is located between the wedge-shaped locking block (34) and the locking plate (33), and a screw (36) is used to connect and fix the wedge-shaped locking block (34), the adjusting shim (35) and the locking plate (33).

[0067] The purpose of the beveled area (342) is to allow the wedge-shaped locking block (34) to easily enter under the door panel (26) of the manhole door assembly (2), preventing minor installation errors from causing the manhole door lock pin assembly (3) to fail to rotate to the locking position. A threaded hole is provided on the wedge-shaped locking block (34). The adjusting shim (35) is made of thin steel plate and is used to adjust the actual working height of the upper surface of the wedge-shaped locking block (34). If the wedge-shaped locking block (34) does not fit well with the manhole door assembly (2) after installation, the manhole door assembly (2) can be fully fitted with the manhole door frame assembly (1) by replacing the adjusting shim (35) with one of appropriate thickness or increasing the number of adjusting shims (35). The screw (36) passes under the locking plate (33) to connect the locking plate (33), the wedge-shaped locking block (34), and the adjusting shim (35) into a whole.

[0068] Combination Figure 2 The diagram shows the positional relationship of the components when the manhole door assembly (2) is closed and the manhole door locking pin assembly (3) is in the locked position. The wedge-shaped locking block (34) of the manhole door locking pin assembly (3) abuts against the bottom surface of the door panel (26) of the manhole door assembly (2). At this time, the bottom surface of the manhole door assembly (2) is in contact with the bottom surface of the manhole door frame assembly (1), and the manhole door locking pin assembly (3) is locked in place by the first lock cylinder cotter pin (7). This design effectively prevents structural loosening and greatly improves overall safety.

[0069] In one embodiment, the manhole door frame assembly (1) further includes handrails (11), the number of handrails (11) is two, the two handrails (11) are symmetrically arranged on the frame body relative to the central opening (101), and the handrails (11) are perpendicular to the frame body.

[0070] For example, a handrail (11) is installed on the upper panel (17) in the aforementioned embodiment to facilitate the operator's climbing.

[0071] In one embodiment, the tail cone manhole of the axial flow fan further includes: air tie rods (4), the number of air tie rods (4) is two, the two air tie rods (4) are symmetrically arranged on the manhole door frame assembly (1) with respect to the central opening (101) and connected to the manhole door assembly (2), the air tie rods (4) are used to provide tension to the manhole door assembly (2).

[0072] A first gas lever connector (12) is fixedly installed on the side of the handrail (11). The manhole door assembly (2) includes a second gas lever connector (21). The gas lever (4) is hinged to the first gas lever connector (12) and the second gas lever connector (21). Due to the large weight of the manhole door assembly (2), it is easy for it to suddenly fall downward after the limit is released, causing personal injury. In addition, when closing the manhole door assembly (2), the operator also needs to exert a lot of force to push the manhole door assembly (2) back to the closed position. To solve the above problems, this application utilizes a gas lever (4). The gas lever (4) is an important auxiliary component calculated based on the accurate structural stress analysis of the manhole door assembly (2). The manhole door assembly (2) is made of steel plate and has a large weight. The gas lever (4) can provide appropriate auxiliary pulling force, allowing the operator to easily open and close the manhole door assembly (2) and avoid the manhole door assembly (2) from suddenly falling and injuring the operator due to lack of support when opening the manhole door assembly (2). In some embodiments, the second gas lever connector (21) is symmetrically arranged on the door body or door panel (26) relative to the central opening (101), and the second gas lever connector (21) is arranged near the pivot side of the manhole door assembly (2). This allows the gas lever (4) to apply the required pulling force to the manhole door assembly (2) near the pivot side, ensuring that the side of the manhole door assembly (2) that is rotatably connected to the manhole door frame assembly (1) can fit tightly with the manhole door frame assembly (1), and preventing the hinge from having gaps at the rotatable connection between the manhole door assembly (2) and the manhole door frame assembly (1) due to manufacturing and installation errors or wear during use, which would affect the fit between the manhole door assembly and the manhole door frame assembly (1).

[0073] In one implementation, such as Figure 6 As shown, the axial flow fan tail cone manhole also includes: a pin (5), and the manhole door assembly (2) includes at least one rotating arm (22) and a door body. The rotating arm (22) is fixed to the door body and is connected to the manhole door frame assembly (1) through the pin (5). A limiting protrusion (221) is provided on the rotating arm (22), which is used to interact with the manhole door frame assembly (1) to limit the maximum opening angle of the door body.

[0074] The manhole door frame assembly (1) also includes a manhole door connector (14), which is a common hinge support. It is welded and fixed to the manhole door frame panel (13) and the first manhole door frame transverse side plate (15). The manhole door connector (14) has a pin hole that matches the pin (5). The door body pin (5) is rotatably connected to the manhole door connector (14) or the manhole door frame assembly (1). There can be two rotating arms (22), which are spaced apart. The rotating arms (22) can be approximately U-shaped. A limiting protrusion (221) is provided near the pin (5) to limit the opening angle of the door body and prevent the door body from hitting the fan tail cone housing (6) due to excessive opening angle. At the same time, it can also prevent the gas pull rod (4) from getting too close to the pin (5) due to excessive opening angle of the door body, thus losing effective auxiliary pulling force and causing possible damage. Preferably, when the limiting protrusion (221) abuts against the manhole door frame assembly (1), the angle between the outer surface of the door body and the horizontal plane is between 70° and 75°.

[0075] In one embodiment, the door body includes an outer panel (25), a door panel (26), and a support rib. The outer panel (25) and the door panel (26) are spaced apart, with the edge of the outer panel (25) extending to the outer side of the door panel (26). The support rib is located between the outer panel (25) and the door panel (26). When the manhole door assembly (2) covers the central opening (101), the door panel (26) is embedded in the central opening (101), the outer panel (25) is in contact with the outer surface of the manhole door frame assembly (1), and the outer surface of the outer panel (25) and the outer surface of the fan tail cone housing (6) are located in the same arc surface. The door panel (26) is provided with a weight-reducing opening. When the manhole door locking pin assembly (3) is in the locked position, the manhole door locking pin assembly (3) abuts against the side of the door panel (26) opposite to the outer panel (25), thus restricting the manhole door assembly (2) to the position covering the central opening (101).

[0076] The swing arm (22) is fixed to the door panel (26). When the door body closes the central opening (101), the outer panel (25) is in contact with the outer surface of the manhole door frame panel (13). The thickness of the outer panel (25) is the same as the thickness of the fan tail cone shell (6), which ensures the continuity of the outer surface of the fan tail cone shell (6) when the manhole door assembly (2) is closed, and does not cause local damage to the flow field. The support ribs may include multiple horizontal ribs (27) and vertical ribs (28). The horizontal ribs (27) and vertical ribs (28) are arranged in different directions between the outer panel (25) and the door panel (26), and can be fixed by welding. The horizontal ribs (27) and vertical ribs (28) connect the outer panel (26) and the door panel (26) into a whole, improving the strength and rigidity of the manhole door assembly (2). The weight-reducing opening reduces weight and facilitates the welding of the horizontal ribs (27) and vertical ribs (28). The four corners of the door are all beveled, which is both aesthetically pleasing and safe.

[0077] In one implementation, such as Figure 6-8 As shown, the manhole door assembly (2) also includes an upper telescopic ladder fixing clip (23), an upper telescopic ladder fixing seat (24), and a lower telescopic ladder fixing seat (29). The upper telescopic ladder fixing seat (24) is connected to the door body, and the upper telescopic ladder fixing clip (23) is detachably connected to the upper telescopic ladder fixing seat (24) to cooperate with the upper telescopic ladder fixing seat (24) to clamp the highest level crossbeam of the telescopic ladder (9). The lower telescopic ladder fixing seat (29) is located on the side of the door body away from the upper telescopic ladder fixing seat (24) and is used to connect straps to fix the lowest level crossbeam of the telescopic ladder (9). Figure 7 As shown, when staff need to enter the turbine tail cone housing (6), the manhole door assembly (2) is opened, and the telescopic ladder (9) is opened to... Figure 7 As shown, this eliminates the need for operators to erect temporary scaffolding or carry ladders, making it convenient to use. After use, when it is necessary to close the manhole door assembly (2), push the telescopic ladder (9) upwards to the position shown. Figure 8 The telescopic ladder (9) can be stored in the location shown, making it convenient to use.

[0078] The following summarizes the beneficial effects of this application:

[0079] 1. This application adopts a modular design method, such as dividing the manhole of the tail cone of the axial flow fan into a manhole door frame assembly (1), a manhole door assembly (2) and a manhole door lock pin assembly (3), etc., and adopts a modular connection method, which makes manufacturing, installation and debugging less difficult;

[0080] 2. The double hinge + double locking pin form is adopted, namely the combination of two manhole door locking pin assemblies (3) and two pin shafts (5) and rotating arms (22), which realizes the quick opening and closing and locking of the manhole door assembly (2). The locking of the manhole door locking pin assembly (3) replaces the traditional large number of bolts, avoiding a large amount of work of tilting the head to tighten bolts, and greatly improving the efficiency of opening and closing the manhole door.

[0081] 3. A pneumatic lever (4) is used to provide auxiliary pulling force, allowing operators to easily open and close the manhole door assembly (2), avoiding the sudden fall of the manhole door assembly (2) due to lack of support when opening it and injuring the operator. At the same time, the pulling force of the pneumatic lever (4) on the manhole door assembly (2) is close to the pivot side of the manhole door assembly (2), which ensures that the hinge side of the manhole door assembly (2) is tightly fitted with the manhole door frame assembly (1), and then cooperates with the manhole door lock pin assembly (3) to ensure that the manhole door assembly (2) and the manhole door frame assembly (1) fit together in all directions.

[0082] 4. The swing arm (22) is provided with a limiting protrusion (221), which can limit the opening angle of the manhole door assembly (2) to prevent the outer panel (25) from hitting the fan tail cone housing (6) due to the excessive opening angle of the manhole door assembly (2). At the same time, it can also prevent the air pull rod (4) from getting too close to the pin (5) due to the excessive opening angle of the manhole door assembly (2), thus losing effective auxiliary pulling force and causing possible damage.

[0083] 5. The manhole door assembly (2) is equipped with an upper fixing seat (24) and a lower fixing seat (29) for the telescopic ladder. The upper fixing seat (24) is equipped with a detachable upper fixing clip (23) for the telescopic ladder, which can effectively fix the top of the telescopic ladder (9). By placing the telescopic ladder (9) inside the manhole, the operator does not need to set up temporary scaffolding or carry ladders. After opening the manhole, the telescopic ladder (9) can be opened and closed simply by pulling / pushing the lower part of the telescopic ladder (9), which is convenient to use.

[0084] 6. The manhole door lock pin assembly (3) is equipped with an adjustment shim (35) to adjust the actual working height of the upper surface of the wedge lock block (34). If the fit of the manhole door assembly (2) is not good after installation, the manhole door assembly (2) and the manhole door lock pin assembly (3) can be fully fitted by replacing the adjustment shim (35) of appropriate thickness. The installation and debugging are easy.

[0085] 7. The manhole door lock pin assembly (3) is equipped with an anti-loosening cotter pin, namely the second lock cylinder cotter pin (8). The lock cylinder (31) of the manhole door lock pin assembly (3) and the manhole door lock pin mounting base (110) are also equipped with anti-loosening cotter pins, namely the first lock cylinder cotter pin (7). This can prevent the manhole door lock pin assembly (3) from loosening due to vibration or other factors, the manhole door lock pin assembly (3) from rotating relative to the manhole door frame assembly (1), and even the manhole door assembly (2) from opening abnormally, which greatly improves the overall safety.

[0086] It should be noted that this utility model is designed for the manhole of the tail cone of a large axial flow fan, but it is not limited to this application scenario. This utility model can also be used for other applications that require manholes to be opened under the equipment.

[0087] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A tail cone manhole for an axial flow fan, characterized in that, include: Manhole door frame assembly (1), manhole door assembly (2) and manhole door lock pin assembly (3); The manhole frame assembly (1) is used to connect with the tail cone housing (6) of the fan, and the manhole frame assembly (1) includes a central opening (101); The manhole door assembly (2) is movably connected to the manhole door frame assembly (1), and the manhole door assembly (2) is used to move to cover or open the central opening (101); The manhole door lock pin assembly (3) is movably connected to the manhole door frame assembly (1). The manhole door lock pin assembly (3) has at least a locked position and a released position. In the locked position, the manhole door lock pin assembly (3) acts on the manhole door assembly (2) to restrict the manhole door assembly (2) to a position covering the central opening (101). In the released position, the manhole door lock pin assembly (3) disengages from the manhole door assembly (2). The force-applying end of the manhole door lock pin assembly (3) is used to apply external force to move the manhole door lock pin assembly (3) between the locked position and the released position.

2. The axial flow fan tail cone manhole according to claim 1, characterized in that, The manhole door frame assembly (1) includes a frame body and a manhole door lock pin mounting base (110); The frame body is used to fix to the inner surface of the fan tail cone housing (6), and the frame body has the central opening (101); There are two manhole door lock pin mounting seats (110). The two manhole door lock pin mounting seats (110) are symmetrically arranged on the frame body relative to the central opening (101). The first end of the manhole door lock pin mounting seat (110) protrudes from the side of the frame body used to connect the fan tail cone housing (6). The manhole door lock pin mounting seat (110) is used to pass through the clearance hole of the fan tail cone housing (6) so that the first end of the manhole door lock pin mounting seat (110) is located outside the fan tail cone housing (6). The manhole door lock pin mounting base (110) includes an inner hole, the manhole door lock pin assembly (3) passes through the inner hole, and the force-applying end of the manhole door lock pin assembly (3) is exposed outside the fan tail cone housing (6) through the manhole door lock pin mounting base (110).

3. The axial flow fan tail cone manhole according to claim 2, characterized in that, The manhole door lock pin assembly (3) includes a lock cylinder shaft (31), a fastening nut (32), and a lock plate (33); The lock cylinder shaft (31) is rotatably inserted into the inner hole of the manhole door lock pin mounting seat (110), the lock plate (33) is sleeved with the lock cylinder shaft (31), and the lock plate (33) and the lock cylinder shaft (31) are circumferentially limited, and the fastening nut (32) is screwed to the lock cylinder shaft (31) to fix the lock plate (33); The lock cylinder shaft (31) includes the force-applying end, and the lock plate (33) includes the locking position and the releasing position.

4. The axial flow fan tail cone manhole according to claim 3, characterized in that, The axial flow fan tail cone manhole also includes: First lock cylinder cotter pin (7) and second lock cylinder cotter pin (8); The force-applying end of the lock cylinder (31) is provided with an inner force-applying hole (311), and the side wall of the inner force-applying hole is provided with a first pin hole (312). The manhole door lock pin mounting seat (110) is provided with a first positioning hole (111). The first lock cylinder cotter pin (7) is inserted into the first pin hole (312) and the first positioning hole (111) to limit the circumferential movement of the lock cylinder (31) and the manhole door lock pin mounting seat (110), thereby restricting the lock piece (33) to the locked position. A second pin hole (313) is provided on the threaded section connecting the lock cylinder (31) and the fastening nut (32). At least one second positioning hole (321) is provided on the fastening nut (32). The second lock cylinder cotter pin (8) is inserted into the second pin hole (313) and the second positioning hole (321) to limit the circumferential movement of the lock cylinder (31) and the fastening nut (32).

5. The axial flow fan tail cone manhole according to claim 3, characterized in that, The manhole door lock pin assembly (3) also includes a wedge-shaped lock block (34), at least one adjusting shim (35), and a screw (36); The upper surface of the wedge-shaped locking block (34) includes a planar area (341) and an inclined area (342). The inclined area (342) is used to act against the edge of the manhole door assembly (2) when the locking piece (33) moves from the loose position to the locked position, and is embedded below the partial structure of the manhole door assembly (2). The planar area (341) is used to abut against the lower part of the partial structure of the manhole door assembly (2) when the locking piece (33) is in the locked position. The adjusting shim (35) is located between the wedge-shaped locking block (34) and the locking plate (33), and the screw (36) is used to connect and fix the wedge-shaped locking block (34), the adjusting shim (35) and the locking plate (33).

6. The axial flow fan tail cone manhole according to claim 2, characterized in that, The manhole door frame assembly (1) also includes a handrail (11), and there are two handrails (11). The two handrails (11) are symmetrically arranged on the frame body relative to the central opening (101), and the handrails (11) are perpendicular to the frame body.

7. The axial flow fan tail cone manhole according to claim 1, characterized in that, The axial flow fan tail cone manhole also includes: Two gas rods (4) are provided. The two gas rods (4) are symmetrically arranged on the manhole door frame assembly (1) relative to the central opening (101) and connected to the manhole door assembly (2). The gas rods (4) are used to provide tension to the manhole door assembly (2).

8. The axial flow fan tail cone manhole according to claim 1, characterized in that, The axial flow fan tail cone manhole also includes: The manhole door assembly (2) includes at least one rotating arm (22) and a door body. The rotating arm (22) is fixed on the door body. The rotating arm (22) is connected to the manhole door frame assembly (1) through a pin (5). A limiting protrusion (221) is provided on the rotating arm (22). The limiting protrusion (221) is used to interact with the manhole door frame assembly (1) to limit the maximum opening angle of the door body.

9. The axial flow fan tail cone manhole according to claim 8, characterized in that, The door body includes an outer panel (25), a door panel (26), and supporting ribs; The outer panel (25) and the door panel (26) are spaced apart, the edge of the outer panel (25) extends to the outside of the door panel (26), and the supporting rib is located between the outer panel (25) and the door panel (26). When the manhole door assembly (2) covers the central opening (101), the door panel (26) is embedded in the central opening (101), the outer panel (25) is attached to the outer surface of the manhole door frame assembly (1), and the outer panel (25) and the outer surface of the fan tail cone housing (6) are located in the same arc surface; The door panel (26) is provided with a weight-reducing opening. When the manhole door lock pin assembly (3) is in the locked position, the manhole door lock pin assembly (3) abuts against the side of the door panel (26) opposite to the outer panel (25), thereby restricting the manhole door assembly (2) to a position covering the central opening (101).

10. The axial flow fan tail cone manhole according to claim 8, characterized in that, The manhole door assembly (2) also includes an upper fixing clamp (23) for the telescopic ladder, an upper fixing seat (24) for the telescopic ladder, and a lower fixing seat (29) for the telescopic ladder; The upper fixing seat (24) of the telescopic ladder is connected to the door body, and the upper fixing clamp (23) of the telescopic ladder is detachably connected to the upper fixing seat (24) of the telescopic ladder and is used to cooperate with the upper fixing seat (24) of the telescopic ladder to clamp the crossbeam of the highest step of the telescopic ladder. The lower fixing seat (29) of the telescopic ladder is located on the side of the door body away from the upper fixing seat (24) of the telescopic ladder, and is used to connect the straps to fix the lowest level of the telescopic ladder.

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