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] The invention relates to the technical field of axial flow fans, and in particular to a tail cone manhole of an axial flow fan. Background Art

[0002] As a key component in large-scale wind tunnel test equipment, large axial flow fans have large geometric dimensions, and the fan diameter can reach 7 meters or even larger. During the use of such fans, the motor, bearings and other moving parts need to be regularly maintained and repaired when a fault occurs. Such operations require personnel to go to the location of the drive motor and rotor system inside the axial flow fan. Therefore, a manhole is usually required on the tail cone housing of the fan, and personnel enter the casing through the tail cone manhole to reach the location of the drive motor and rotor system inside the casing.

[0003] The tail cone of a large axial flow fan is usually higher than the bottom of the flow channel in the equipment, and the manhole needs to be set directly below the tail cone for easy operation. At present, the manhole structure commonly used in large axial flow fans is an ordinary hinged shaft manhole. The manhole is located at the bottom of the tail cone, and the manhole door is fixed by setting a full circle of fastening bolts on the edge of the manhole door. However, this manhole structure has many problems in terms of installation convenience and safety of use: 1. There are a large number of bolts and nuts on the outside of the tail cone shell, which will destroy the continuity of the surface of the tail cone shell, cause local damage to the flow field, and reduce the quality of the flow field; 2. The conventional bolt and nut connection structure lacks effective locking and is easy to loosen under long-term vibration environment. If nuts, washers and other parts fall off, they will be blown downstream by the fan, impacting the downstream test equipment and test pieces at high speed, causing serious damage; 3. When the manhole needs to be opened, the operator needs to look up and remove all the bolts in turn before opening the manhole door, which is troublesome to operate. Summary of the invention

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

[0005] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0006] An embodiment of the present invention provides a tail cone manhole of an axial flow fan, comprising:

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

[0008] The manhole door frame assembly (1) is used to be connected to the fan tail cone housing (6), and the manhole door frame assembly (1) comprises 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 positions of the manhole door lock pin assembly (3) include a locked position and a released position. When 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). When in the released position, the manhole door lock pin assembly (3) is separated from the manhole door assembly (2). The force-applying end of the manhole door lock pin assembly (3) is used to apply an external force to move the manhole door lock pin assembly (3) between the locked position and the released position.

[0011] Wherein, the manhole door frame assembly (1) comprises a frame body and a manhole door lock pin mounting seat (110);

[0012] The frame body is used to be fixed to the inner surface of the fan tail cone housing (6), and the frame body is provided with a central opening (101);

[0013] There are two manhole door lock pin mounting seats (110), and the two manhole door lock pin mounting seats (110) are symmetrically arranged on the frame body relative to the central opening (101), and the first end of the manhole door lock pin mounting seat (110) protrudes from a side of the frame body for connecting 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);

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

[0015] Wherein, the manhole door lock pin assembly (3) comprises a lock core shaft (31), a fastening nut (32) and a lock plate (33);

[0016] The lock core 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 core shaft (31), and the lock plate (33) and the lock core shaft (31) are circumferentially limited, and the fastening nut (32) is threadedly connected with the lock core shaft (31) to fix the lock plate (33);

[0017] The lock core shaft (31) comprises a force-applying end, and the lock plate (33) comprises a locking position and a releasing position.

[0018] Among them, the tail cone manhole of the axial flow fan also includes:

[0019] A first lock core shaft cotter pin (7) and a second lock core shaft cotter pin (8);

[0020] An inner force-applying hole (311) is provided at the force-applying end of the lock core shaft (31), a first pin hole (312) is provided on the side wall of the inner force-applying hole, a first positioning hole (111) is provided on the manhole door lock pin mounting seat (110), and a first lock core shaft cotter pin (7) is inserted into the first pin hole (312) and the first positioning hole (111) to limit the lock core shaft (31) and the manhole door lock pin mounting seat (110) in a circumferential direction, thereby limiting the lock plate (33) in a locked position;

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

[0022] Wherein, the manhole door lock pin assembly (3) further comprises a wedge-shaped lock block (34), at least one adjustment gasket (35) and a screw (36);

[0023] The upper surface of the wedge-shaped locking block (34) comprises a plane area (341) and an inclined area (342); the inclined area (342) is used to act on the edge of the manhole door assembly (2) when the locking plate (33) moves from the released position to the locked position, and is embedded under the partial structure of the manhole door assembly (2); the plane area (341) is used to abut against the partial structure of the manhole door assembly (2) when the locking plate (33) is in the locked position;

[0024] The adjusting washer (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 washer (35) and the locking plate (33).

[0025] The manhole door frame assembly (1) further comprises a handrail (11), the number of the 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.

[0026] Among them, the tail cone manhole of the axial flow fan also includes:

[0027] Gas pull rods (4), there are two gas pull rods (4), the two gas pull rods (4) are symmetrically arranged on the manhole door frame assembly (1) relative to the central opening (101), and are connected to the manhole door assembly (2), and the gas pull rods (4) are used to provide pulling force for the manhole door assembly (2).

[0028] Among them, the tail cone manhole of the axial flow fan also includes:

[0029] A pin shaft (5), the manhole door assembly (2) comprises 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 a pin shaft (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.

[0031] Wherein, the door body comprises an exterior panel (25), a door plate (26) and supporting ribs;

[0032] The exterior panel (25) and the door panel (26) are arranged at intervals, the edge of the exterior panel (25) extends to the outside of the door panel (26), and the supporting ribs are located between the exterior 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) fits 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 plate (26) is provided with a weight-reducing opening. When the manhole door lock pin assembly (3) is in a locked position, the manhole door lock pin assembly (3) abuts against the side of the door plate (26) opposite to the exterior panel (25), thereby limiting the manhole door assembly (2) to a position covering the central opening (101).

[0035] Wherein, the manhole door assembly (2) further comprises an upper fixing clamp (23) of the telescopic ladder, an upper fixing seat (24) of the telescopic ladder and a lower fixing seat (29) of the telescopic ladder;

[0036] 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 highest level beam of the telescopic ladder;

[0037] The lower fixing seat (29) of the telescopic ladder is arranged on a side of the door body away from the upper fixing seat (24) of the telescopic ladder, and is used for connecting a binding belt to fix the lowest level crossbeam of the telescopic ladder.

[0038] An axial flow fan tail cone manhole proposed in an embodiment of the present invention is connected to the manhole door frame assembly through a manhole door assembly, and the manhole door lock pin assembly is adjusted to a locked position to fix the manhole door assembly, so that the manhole door assembly closes the center opening. When the center opening needs to be opened, the position of the manhole door assembly can be adjusted to a loosened position without disassembling the manhole door assembly. On the one hand, since the manhole door lock pin assembly does not need to be disassembled from the manhole door frame assembly, its connection is tight and has great strength, and there is no need to set a large number of manhole door lock pin assemblies. For example, only two can be set, thereby avoiding The problem that a large number of bolts and nuts exist on the outside of the tail cone shell in the prior art, which destroys the continuity of the surface of the tail cone shell, causes local damage to the flow field, and reduces the quality of the flow field is avoided; on the other hand, through the structural setting of the manhole door lock pin assembly, the manhole door lock pin assembly can be limited by a pin, thereby solving the problem that the conventional bolt and nut connection structure lacks effective locking, is easy to loosen under long-term vibration environment, and has potential safety hazards; on the other hand, the small number of manhole door lock pin assemblies also reduces the complexity of operations when opening and closing the manhole door assembly, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic structural diagram of a tail cone manhole of an axial flow fan and a partial structure of a tail cone housing of the fan provided in an embodiment of the present invention;

[0040] Figure 2 A schematic cross-sectional structure diagram of a tail cone manhole of an axial flow fan and a partial structure of a tail cone housing of the fan provided in an embodiment of the present invention;

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

[0042] Figure 4 A schematic structural diagram of a manhole door lock pin assembly in a tail cone manhole of an axial flow fan provided by an embodiment of the present invention;

[0043] Figure 5 A schematic structural diagram of a lock core shaft in a tail cone manhole of an axial flow fan provided by an embodiment of the present invention;

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

[0045] Figure 7 A schematic structural diagram of an axial flow fan tail cone manhole and a telescopic ladder provided by an embodiment of the present invention when the telescopic ladder is in a retracted state;

[0046] Figure 8A schematic structural diagram of a manhole in a tail cone of an axial flow fan provided by an embodiment of the present invention and a telescopic ladder in a pulled-out state when the telescopic ladder cooperates with the manhole in the tail cone of the axial flow fan;

[0047] Fig. 9 A schematic diagram of a usage scenario of an axial flow fan provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation method, structure, characteristics and effects of the tail cone manhole of an axial flow fan proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

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

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

[0051] The manhole door frame assembly (1) is used to be connected to the fan tail cone housing (6), and the manhole door frame assembly (1) comprises 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 positions of the manhole door lock pin assembly (3) include a locked position and a released position. When 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). When in the released position, the manhole door lock pin assembly (3) is separated from the manhole door assembly (2). The force-applying end of the manhole door lock pin assembly (3) is used to apply an external force to move the manhole door lock pin assembly (3) between the locked position and the released position.

[0054] like Fig. 9 As shown, the axial flow fan tail cone manhole (10) is used to be installed on the fan tail cone housing (6), and the axial flow fan (100) is arranged in the air duct (500) to provide axial flow wind for the air duct (500). The fan tail cone housing (6) presents an approximately conical structure with a reduced cross-section in the direction away from the front housing (the purpose is to optimize the flow field). The axial flow fan tail cone manhole (10) can be arranged at a lower position of the fan tail cone housing (6) close to the bottom end of the air duct (500), that is, close to the front housing, and arranged at the bottom of the fan tail cone housing (6), so as to facilitate personnel operation and entry and exit.

[0055] The fan tail cone housing (6) is provided with an installation opening, and the manhole door assembly (2) is installed in the fan tail cone housing (6) and connected to the inner wall of the fan tail cone housing (6), such as by welding. 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 at the 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 movably connected in a hinged manner, such as by a pin shaft connection, which will be described in conjunction with a specific implementation method in the following text. The manhole door assembly (2) is movably connected to the manhole door frame assembly (1) so that a single side of the manhole door assembly (2) is rotatably connected to the manhole door frame assembly (1), and then the manhole door assembly (2) can cover or open the central opening (101) by rotating, and then the central opening (101) and the fan tail cone housing (6) are closed, or the central opening (101) is opened to allow an operator to enter.

[0056] The movable connection between the manhole door lock pin assembly (3) and the manhole door frame assembly (1) can be a rotational connection. The manhole door lock pin assembly (3) does not separate from the manhole door frame assembly (1) when it is in the locked position and the released position. When it is in the locked position, the manhole door lock pin assembly (3) and the manhole door assembly (2) can be abutted, such as inserted and abutted under the door plate (26) in the manhole door assembly (2), and then the manhole door assembly (2) is limited by supporting the door plate (26). When it is in the released position, the manhole door lock pin assembly (3) is separated from the manhole door assembly (2), such as separated from the door plate (26), and then the manhole door assembly (2) can be opened. 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 outside the fan tail cone housing (6), thereby enabling an operator to adjust the manhole door lock pin assembly (3) to achieve position change.

[0057] The structure of the manhole door lock pin assembly (3) can be various, which will be further illustrated below. The number of the manhole door lock pin assemblies (3) can be two, located on opposite sides of the central opening (101) and away from the end of the manhole door assembly (2) and the manhole door frame assembly (1) that are rotatably connected, thereby realizing the limiting of multiple positions of the manhole door assembly (2).

[0058] For the convenience of explanation, in the following embodiments, the specific implementation structure of the tail cone manhole (10) of the axial flow fan is described by taking the direction of the axial flow fan in actual use as an example.

[0059] An axial flow fan tail cone manhole proposed in an embodiment of the present invention is connected to the manhole door frame assembly through a manhole door assembly, and the manhole door lock pin assembly is adjusted to a locked position to fix the manhole door assembly, so that the manhole door assembly closes the center opening. When the center opening needs to be opened, the position of the manhole door assembly can be adjusted to a loosened position without disassembling the manhole door assembly. On the one hand, since the manhole door lock pin assembly does not need to be disassembled from the manhole door frame assembly, its connection is tight and has great strength, and there is no need to set a large number of manhole door lock pin assemblies. For example, only two can be set, thereby avoiding The problem that a large number of bolts and nuts exist on the outside of the tail cone shell in the prior art, which destroys the continuity of the surface of the tail cone shell, causes local damage to the flow field, and reduces the quality of the flow field is avoided; on the other hand, through the structural setting of the manhole door lock pin assembly, the manhole door lock pin assembly can be limited by a pin, thereby solving the problem that the conventional bolt and nut connection structure lacks effective locking, is easy to loosen under long-term vibration environment, and has potential safety hazards; on the other hand, the small number of manhole door lock pin assemblies also reduces the complexity of operations when opening and closing the manhole door assembly, thereby improving work efficiency.

[0060] In one embodiment, if 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 be fixed to the inner surface of the fan tail cone housing (6), and the frame body is provided with a central opening (101). There are two manhole door lock pin mounting seats (110), and the two manhole door lock pin mounting seats (110) are symmetrically arranged on the frame body relative to the central opening (101), and the first end of the manhole door lock pin mounting seat (110) protrudes from a side of the frame body for connecting 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 seat (110) comprises an inner hole, the manhole door lock pin assembly (3) is connected to the inner hole, and the force-applying end of the manhole door lock pin assembly (3) is exposed to the outside of the fan tail cone housing (6) through the manhole door lock pin mounting seat (110).

[0061] The structure of the frame body is designed to ensure support strength while being easy to process and lightweight. Specifically, the frame body includes a manhole door frame type panel (13), a first manhole door frame transverse side panel (15), a vertical rib plate (16), an upper panel (17), a manhole door frame longitudinal side panel (18) and a second manhole door frame transverse side panel (19). The manhole door frame type panel (13) is provided with the aforementioned central opening (101) as a manhole for passage, the surface shape of the manhole door frame type panel (13) is adapted to the surface shape of the fan tail cone shell (6), and the lower surface of the manhole door frame type panel (13) fits the steel plate on the inner surface of the fan tail cone shell (6). The first manhole door frame transverse side plate (15) and the second manhole door frame transverse side plate (19) are located on both sides of the manhole door frame type panel (13) in the first direction. The number of manhole door frame longitudinal side plates (18) is two, which are respectively located on both sides of the manhole door frame type panel (13) in the second direction. The first manhole door frame transverse side plate (15), the second manhole door frame transverse side plate (19) and the manhole door frame longitudinal side plate (18) are all vertically connected to the manhole door frame type panel (13). Both sides of the manhole door frame longitudinal side plate (18) are fixed to the first manhole door frame transverse side plate (15) and the second manhole door frame transverse side plate (19). The number of upper panels (17) is two, and the upper panels (17) and the manhole door frame type panel (13) are spaced apart in the vertical direction, and the two upper panels (17) are respectively connected to the two manhole door frame longitudinal side plates (18). It can be understood that the upper panel (17) is a narrow strip plate and will not block the central opening (101). There are multiple rib plates (16), which are arranged between the upper panel (17) and the manhole door frame panel (13), and between the first manhole door frame transverse side plate (15), the second manhole door frame transverse side plate (19) and the manhole door frame panel (13). The manhole door frame panel (13), the first manhole door frame transverse side plate (15), the rib plates (16), the upper panel (17), the manhole door frame longitudinal side plate (18), and the second manhole door frame transverse side plate (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 door frame.

[0062] The manhole door lock pin mounting seat (10) is a circular tubular structure, and is arranged symmetrically with respect to the central opening (101). Figure 3 The second end surface of the manhole door lock pin mounting seat (10) is slightly higher than the upper panel (17), and the first end of the manhole door lock pin mounting seat (10) is lower than the manhole door frame panel (13). Figure 2 As described above, the inner hole of the manhole door lock pin mounting seat (10) is a stepped hole, which will be further described in conjunction with the manhole door lock pin assembly (3) hereinafter.

[0063] In one embodiment, if Figure 2 , Figure 4 , Figure 5As shown, the manhole door lock pin assembly (3) comprises a lock core shaft (31), a fastening nut (32) and a lock plate (33). The lock core 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 core shaft (31), and the lock plate (33) and the lock core shaft (31) are circumferentially limited, and the fastening nut (32) is threadedly connected to the lock core shaft (31) to fix the lock plate (33). The lock core shaft (31) comprises a force application end, and the lock plate (33) comprises a locking position and a loosening position.

[0064] Furthermore, the tail cone manhole of the axial flow fan further comprises: a first lock core shaft cotter pin (7) and a second lock core shaft cotter pin (8). An inner force application hole (311) is provided at the force application end of the lock core shaft (31), a first pin hole (312) is provided on the side wall of the inner force application hole, a first positioning hole (111) is provided on the manhole door lock pin mounting seat (110), and 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 lock core shaft (31) and the manhole door lock pin mounting seat (110) in the circumferential direction, thereby limiting the lock plate (33) in the locking position. A second pin hole (313) is provided on the threaded section connecting the lock core shaft (31) and the fastening nut (32), and at least one second positioning hole (321) is provided on the fastening nut (32). A second lock core shaft cotter pin (8) is inserted into the second pin hole (313) and the second positioning hole (321) to limit the circumferential position of the lock core shaft (31) and the fastening nut (32).

[0065] The lock core shaft (31) is a cylindrical structure with steps on the surface. The inner hole of the manhole door lock pin mounting seat (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 core shaft (31) is a cylinder with a hexagonal hole. The inner force hole (311) is the hexagonal hole at the lower end of the lock core shaft (31). A first pin hole (312) is provided at a specific side of the hexagonal hole. The first positioning hole (111) is opened in the large diameter section, and the position of the first positioning hole (111) matches the position of the first pin hole (312) of the lock core shaft (31). After the manhole door assembly (2) closes the central opening (101) and adjusts the manhole door lock pin assembly (3) to the locking position, the first lock core shaft cotter pin (7) is inserted into the first positioning hole (111) and the first pin hole (312) to lock the lock core shaft (31), which can completely prevent the manhole door lock pin assembly (3) from loosening due to vibration and other factors, and prevent the manhole door assembly (2) from opening abnormally. The middle part of the lock core shaft (31) is cylindrical, and the outer diameter is smaller than the lower cylindrical area of ​​the lock core shaft (31). The middle upper part of the lock core shaft (31) is a square cross-section section, and a square hole is provided on the lock plate (33). The lock plate (33) is sleeved on the square cross-section section through the square hole, and then the circumferential limit is realized, so that the lock core shaft (31) can drive the lock plate (33) to rotate. The uppermost end of the lock core shaft (31) is a threaded section, which cooperates with the fastening nut (32). The middle cylindrical area of ​​the lock core shaft (31) is connected to the small diameter section of the manhole door lock pin mounting seat (110) for rotation, and the lower cylindrical area of ​​the lock core shaft (31) is connected to the large diameter section of the manhole door lock pin mounting seat (110) for rotation, and then the lock core shaft (31) is vertically limited upward through the step, and the lock core shaft (31) is limited in the vertical direction by the fastening nut (32). The threaded section is provided with a second pin hole (313) which cooperates with the second lock core shaft cotter pin (8) to prevent the fastening nut (32) from loosening and completely avoid the locking plate (33) from loosening during use.

[0066] The locking plate (33) is a bent structure, and the straight sections at both ends are parallel to each other. One of the two straight sections is provided with the aforementioned square hole, and the other is provided with 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 adjustment gasket (35) and a screw (36). The upper surface of the wedge-shaped locking block (34) includes a plane area (341) and an inclined area (342). The inclined area (342) is used to act on 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 the partial structure of the manhole door assembly (2). The plane area (341) is used to abut against the partial structure of the manhole door assembly (2) when the locking plate (33) is in the locked position. The adjusting washer (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 washer (35) and the locking plate (33).

[0067] The function of the inclined area (342) is to enable the wedge-shaped lock block (34) to easily enter the lower part of the door panel (26) of the manhole door assembly (2) to prevent the manhole door lock pin assembly (3) from being unable to rotate normally to the locking position due to a slight error caused by the installation. A threaded hole is provided on the wedge-shaped lock block (34). The adjustment gasket (35) is made of a thin steel plate and is used to adjust the actual working height of the upper surface of the wedge-shaped lock block (34). If the wedge-shaped lock block (34) and the manhole door assembly (2) are not well fitted after the installation, the adjustment gasket (35) of suitable thickness can be replaced or the number of the adjustment gaskets (35) can be increased to ensure that the manhole door assembly (2) and the manhole door frame assembly (1) are fully fitted. The screw (36) is inserted from the lower part of the lock plate (33) to connect the lock plate (33), the wedge-shaped lock block (34) and the adjustment gasket (35) into a whole.

[0068] Combination Figure 2 The figure shows the positional relationship of the various components when the manhole door assembly (2) is closed and the manhole door lock pin assembly (3) is in the locked position. The wedge-shaped lock block (34) of the manhole door lock pin assembly (3) presses against the bottom surface of the door plate (26) of the manhole door assembly (2). At this time, the manhole door assembly (2) fits the bottom surface of the manhole door frame assembly (1), and the manhole door lock pin assembly (3) is locked by the first lock core shaft cotter pin (7). This design can effectively prevent the loosening of the structure and greatly improve the overall safety.

[0069] In one embodiment, the manhole door frame assembly (1) further comprises a handrail (11), the number of the 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] If the handrail (11) is installed on the upper panel (17) in the aforementioned embodiment, it is convenient for operators to climb.

[0071] In one embodiment, the tail cone manhole of the axial flow fan further comprises: an air pull rod (4), the number of the air pull rods (4) is two, the two air pull rods (4) are symmetrically arranged on the manhole door frame assembly (1) relative to the central opening (101), and are connected to the manhole door assembly (2), and the air pull rod (4) is used to provide pulling force for the manhole door assembly (2).

[0072] A first gas pull rod connection seat (12) is fixedly installed on the side of the handrail (11), and the manhole door assembly (2) includes a second gas pull rod connection seat (21). The gas pull rod (4) is hinged with the first gas pull rod connection seat (12) and the second gas pull rod connection seat (21). Since the manhole door assembly (2) itself is heavy, it is easy to suddenly fall down after the limit is released, causing personal injury. In addition, when closing the manhole door assembly (2), the operator also needs to spend a lot of effort to push the manhole door assembly (2) back to the closed position. In order to solve the above problems, the present application uses a gas pull rod (4). The gas pull rod (4) is an important auxiliary component obtained by accurate force analysis and calculation of the manhole door assembly (2) structure. The manhole door assembly (2) is made of steel plate and has a large weight. The gas pull rod (4) can provide appropriate auxiliary pulling force, allowing the operator to easily open and close the manhole door assembly (2), avoiding 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 tie rod connection seat (21) is symmetrically arranged on the door body or door panel (26) relative to the central opening (101), and the second gas tie rod connection seat (21) is arranged close to the rotating shaft side of the manhole door assembly (2). Then, the gas tie rod (4) applies the required pulling force to the manhole door assembly (2) on the side close to the rotating shaft of the manhole door assembly (2), thereby ensuring that the side of the manhole door assembly (2) and the manhole door frame assembly (1) that are rotatably connected can fit tightly with the manhole door frame assembly (1), and avoiding the situation where the hinges of the rotating connection between the manhole door assembly (2) and the manhole door frame assembly (1) produce a gap due to manufacturing and installation errors or wear and tear, thereby affecting the fit between the manhole door assembly and the manhole door frame assembly (1).

[0073] In one embodiment, if Figure 6 As shown, the axial flow fan tail cone manhole further comprises: a pin shaft (5), and the manhole door assembly (2) comprises at least one rotating arm (22) and a door body. The rotating arm (22) is fixed on the door body, and the rotating arm (22) is connected to the manhole door frame assembly (1) through the pin shaft (5). A limiting protrusion (221) is provided on the rotating arm (22), and 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.

[0074] The manhole door frame assembly (1) also includes a manhole door connection seat (14), which is a common hinge support and is welded and fixed to the manhole door frame panel (13) and the first manhole door frame transverse side plate (15). The manhole door connection seat (14) is provided with a pin hole matching the pin (5), and is rotatably connected to the manhole door connection seat (14) or the manhole door frame assembly (1) through the door body pin (5). The number of the rotating arms (22) can be two, and the two rotating arms (22) are arranged at intervals. The rotating arms (22) can be approximately U-shaped parts. A limiting protrusion (221) is provided near the pin (5) to limit the opening angle of the door body, so as to prevent the door body from hitting the fan tail cone housing (6) due to the excessive opening angle of the door body. At the same time, it can also prevent the air pull rod (4) from being too close to the pin (5) due to the excessive opening angle of the door body, thereby losing effective auxiliary pulling force and 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 comprises an exterior panel (25), a door plate (26) and supporting ribs. The exterior panel (25) and the door plate (26) are arranged at intervals, the edge of the exterior panel (25) extends to the outside of the door plate (26), and the supporting ribs are located between the exterior panel (25) and the door plate (26). When the manhole door assembly (2) covers the central opening (101), the door plate (26) is embedded in the central opening (101), the exterior panel (25) fits the outer surface of the manhole door frame assembly (1), and the exterior panel (25) and the outer surface of the fan tail cone housing (6) are located in the same arc surface. The door plate (26) is provided with a weight-reducing opening, and when the manhole door lock pin assembly (3) is in a locked position, the manhole door lock pin assembly (3) abuts against the side of the door plate (26) relative to the exterior panel (25), thereby limiting the manhole door assembly (2) to a position covering the central opening (101).

[0076] The rotating arm (22) is fixed on the door panel (26). When the door body closes the central opening (101), the outer panel (25) fits 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), so that the continuity of the outer surface of the fan tail cone shell (6) can be ensured when the manhole door assembly (2) is in the closed state, and no local damage is caused to the flow field. The supporting ribs may include a plurality of transverse ribs (27) and longitudinal ribs (28), which are arranged in different directions between the outer panel (25) and the door panel (26) and can be fixed by welding. The transverse ribs (27) and longitudinal ribs (28) connect the outer panel (26) and the door panel (26) into a whole, thereby improving the strength and rigidity of the manhole door assembly (2). The weight-reducing opening reduces weight and facilitates welding of the transverse ribs (27) and longitudinal ribs (28). The four corners of the door body are beveled, which is beautiful and safe.

[0077] In one embodiment, if Figure 6-8 As shown, the manhole door assembly (2) also includes an upper fixing clamp (23) of the telescopic ladder, an upper fixing seat (24) of the telescopic ladder, and a lower fixing seat (29) of 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 highest level beam of the telescopic ladder (9). The lower fixing seat (29) of the telescopic ladder is arranged on the side of the door body away from the upper fixing seat (24) of the telescopic ladder, and is used to connect a strap to fix the lowest level beam of the telescopic ladder (9). As shown Figure 7 As shown, when a worker needs to enter the fan tail cone housing (6), he opens the manhole door assembly (2) and opens the telescopic ladder (9) to Figure 7 As shown, the operator no longer needs to set up a temporary scaffold or carry a ladder, which is convenient to use. After use, when it is necessary to close the manhole door assembly (2), push the telescopic ladder (9) upward to the position shown in FIG. Figure 8 The telescopic ladder (9) can be stored in the position shown, which is convenient for use.

[0078] The beneficial effects brought about by this application are summarized as follows:

[0079] 1. The present application adopts a modular design method, such as dividing the tail cone manhole 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 reduces the difficulty of manufacturing, installation and debugging;

[0080] 2. A double hinge + double lock pin form is adopted, that is, a combination of two manhole door lock pin assemblies (3) and two pin shafts (5) and a rotating arm (22), so as to realize the rapid opening, closing and locking of the manhole door assembly (2). The locking of the manhole door lock pin assembly (3) replaces the traditional locking of a large number of bolts, thus avoiding a large amount of work of tightening the bolts with the head tilted upward, and greatly improving the efficiency of opening and closing the manhole door.

[0081] 3. The gas pull rod (4) is used to provide auxiliary pulling force, so that the operator can easily open and close the manhole door assembly (2), and avoid the manhole door assembly (2) suddenly falling and injuring the operator due to lack of support when opening the manhole door assembly (2). At the same time, the pulling force of the gas pull rod (4) on the manhole door assembly (2) is close to the rotating shaft side of the manhole door assembly (2), which ensures that the hinged side of the manhole door assembly (2) is closely 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) are fully fitted.

[0082] 4. The rotating arm (22) is provided with a limiting protrusion (221) which can limit the opening angle of the manhole door assembly (2) to prevent the manhole door assembly (2) from opening at too large an angle and causing the outer panel (25) to hit the fan tail cone housing (6). It can also prevent the manhole door assembly (2) from opening at too large an angle and causing the air pull rod (4) to be too close to the pin shaft (5), thereby losing effective auxiliary pulling force and causing possible damage.

[0083] 5. The inner side of the manhole door assembly (2) is provided with an upper fixing seat (24) of the telescopic ladder and a lower fixing seat (29) of the telescopic ladder, wherein the upper fixing seat (24) of the telescopic ladder is provided with a detachable upper fixing clamp (23) of the telescopic ladder, which can effectively fix the top of the telescopic ladder (9). The telescopic ladder (9) is arranged inside the manhole, and the operator does not need to set up a temporary scaffold or carry a ladder. After opening the manhole, the telescopic ladder (9) can be opened and folded by only 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 provided with an adjustment gasket (35) for adjusting the actual working height of the upper surface of the wedge-shaped lock block (34). If the manhole door assembly (2) is not well fitted after installation, the adjustment gasket (35) of suitable thickness can be replaced to ensure that the manhole door assembly (2) and the manhole door lock pin assembly (3) are fully fitted, and the installation and debugging are less difficult.

[0085] 7. The manhole door lock pin assembly (3) is provided with an anti-loosening cotter pin, namely, the second lock core shaft cotter pin (8). The lock core shaft (31) of the manhole door lock pin assembly (3) and the manhole door lock pin mounting seat (110) are also provided with an anti-loosening cotter pin, namely, the first lock core shaft cotter pin (7). This can prevent the structure of 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, thereby greatly improving the overall safety.

[0086] It should be additionally explained that the present invention is designed for the tail cone manhole of a large axial flow fan, but is not limited to this application scenario. Other equipment that requires a manhole under the equipment can also adopt the design of the present invention.

[0087] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An axial flow fan tail cone manhole, characterized in that: include: A manhole door frame assembly (1), a manhole door assembly (2) and a manhole door lock pin assembly (3); The manhole door frame assembly (1) is used to be connected to a fan tail cone housing (6), and the manhole door frame assembly (1) comprises 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), and the position of the manhole door lock pin assembly (3) includes at least a locking position and a release position. In the locking position, the manhole door lock pin assembly (3) acts on the manhole door assembly (2) to limit the manhole door assembly (2) to a position covering the central opening (101). In the release position, the manhole door lock pin assembly (3) is separated from the manhole door assembly (2), and the force-applying end of the manhole door lock pin assembly (3) is used to apply an external force to move the manhole door lock pin assembly (3) between the locking position and the release position.

2. The axial flow fan tail cone manhole according to claim 1, characterized in that: The manhole door frame assembly (1) comprises a frame body and a manhole door lock pin mounting seat (110); The frame body is used to be fixed to the inner surface of the fan tail cone housing (6), and the frame body is provided with the central opening (101); There are two manhole door lock pin mounting seats (110), and 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 for connecting to the fan tail cone shell (6). The manhole door lock pin mounting seat (110) is used to pass through the clearance hole of the fan tail cone shell (6), so that the first end of the manhole door lock pin mounting seat (110) is located outside the fan tail cone shell (6); The manhole door lock pin mounting seat (110) comprises an inner hole, the manhole door lock pin assembly (3) is connected to the inner hole, and the force-applying end of the manhole door lock pin assembly (3) is exposed to the outside of the fan tail cone housing (6) through the manhole door lock pin mounting seat (110).

3. The tail cone manhole of the axial flow fan according to claim 2 is characterized in that: The manhole door lock pin assembly (3) comprises a lock core shaft (31), a fastening nut (32) and a lock plate (33); The lock core 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 core shaft (31), and the lock plate (33) and the lock core shaft (31) are circumferentially limited, and the fastening nut (32) is threadedly connected to the lock core shaft (31) to fix the lock plate (33); The lock core shaft (31) comprises the force-applying end, and the lock plate (33) comprises the locking position and the releasing position.

4. The tail cone manhole of the axial flow fan according to claim 3 is characterized in that: 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); An inner force-applying hole (311) is provided at the force-applying end of the lock core shaft (31), a first pin hole (312) is provided on the side wall of the inner force-applying hole, a first positioning hole (111) is provided on the manhole door lock pin mounting seat (110), and 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 lock core shaft (31) and the manhole door lock pin mounting seat (110) in a circumferential direction, thereby limiting the lock plate (33) in the locking position; A second pin hole (313) is provided on the threaded section connecting the lock core shaft (31) and the fastening nut (32), and at least one second positioning hole (321) is provided on the fastening nut (32). The second lock core shaft cotter pin (8) is inserted into the second pin hole (313) and the second positioning hole (321) to limit the circumferential position of the lock core shaft (31) and the fastening nut (32).

5. The tail cone manhole of the axial flow fan according to claim 3 is characterized in that: The manhole door lock pin assembly (3) further comprises a wedge-shaped lock block (34), at least one adjustment washer (35) and a screw (36); The upper surface of the wedge-shaped locking block (34) comprises a plane area (341) and an inclined area (342); the inclined area (342) is used to act on the edge of the manhole door assembly (2) when the locking plate (33) moves from the release position to the locking position, and is embedded under the partial structure of the manhole door assembly (2); the plane area (341) is used to abut against the partial structure of the manhole door assembly (2) when the locking plate (33) is in the locking position; The adjusting gasket (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 gasket (35) and the locking plate (33).

6. The tail cone manhole of the axial flow fan according to claim 2, characterized in that: The manhole door frame assembly (1) further comprises a handrail (11), wherein the number of the 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.

7. The tail cone manhole of the axial flow fan according to claim 1, characterized in that: The axial flow fan tail cone manhole also includes: An air pull rod (4), wherein the number of the air pull rods (4) is two, and the two air pull rods (4) are symmetrically arranged on the manhole door frame assembly (1) relative to the central opening (101), and are connected to the manhole door assembly (2), and the air pull rod (4) is used to provide pulling force for the manhole door assembly (2).

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

9. The tail cone manhole of the axial flow fan according to claim 8, characterized in that: The door body comprises an exterior panel (25), a door plate (26) and supporting ribs; The exterior panel (25) and the door panel (26) are arranged at intervals, the edge of the exterior panel (25) extends to the outside of the door panel (26), and the supporting ribs are located between the exterior panel (25) and the door panel (26); When the manhole door assembly (2) covers the central opening (101), the door plate (26) is embedded in the central opening (101), the exterior panel (25) is in contact with the outer surface of the manhole door frame assembly (1), and the exterior 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 a locked position, the manhole door lock pin assembly (3) abuts against a side of the door panel (26) opposite to the exterior panel (25), thereby limiting the manhole door assembly (2) to a position covering the central opening (101).

10. The tail cone manhole of the axial flow fan according to claim 8, characterized in that: The manhole door assembly (2) further comprises an upper fixing clamp (23) of the telescopic ladder, an upper fixing seat (24) of the telescopic ladder and a lower fixing seat (29) of the telescopic ladder; The telescopic ladder upper fixing seat (24) is connected to the door body, and the telescopic ladder upper fixing clamp (23) is detachably connected to the telescopic ladder upper fixing seat (24) and is used to cooperate with the telescopic ladder upper fixing seat (24) to clamp the highest level beam of the telescopic ladder; The lower fixing seat (29) of the telescopic ladder is arranged on a side of the door body away from the upper fixing seat (24) of the telescopic ladder, and is used for connecting a binding belt to fix the lowest crossbeam of the telescopic ladder.

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