Motor fixing structure of two-stage axial flow fan

Abstract

The utility model relates to a motor fixing structure of a two-stage axial flow fan, which is a cylindrical motor fixing structure, is arranged at the position of the central axis in a fan shell and is provided with a motor fixing cylinder body, and a plurality of cylinder body inner wall boss surfaces are arranged in the motor fixing cylinder body. And the motor fixing cylinder is in matched positioning connection with the motor fixing surface of the motor shell through the boss surface on the inner wall of the cylinder, and is fixed by a bolt assembly. The two-stage axial flow fan motor solves the problems that a two-stage axial flow fan motor is difficult to disassemble, the maintenance space is small, and the replacement cost is high. A cylindrical motor fixing structure is adopted, the overall structural stability is high, the influence on the aerodynamic performance of the fan is small, the heat dissipation requirement of the motor is met, the special space requirement of ship maintenance is better met, and conditions are provided for efficiently solving the problem of ship ventilation equipment maintenance.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of ship ventilation system, especially a motor fixing structure of two-stage axial flow fan for ship cabin ventilation system. BACKGROUND

[0002] Ship ventilation system is mainly used for the ventilation of functional cabin, and generally requires large air volume. The ventilation power components usually adopt centrifugal fan. However, centrifugal fan often occupies large installation space, especially in the limited space of ship, it is difficult to meet the current miniaturization and high efficiency development trend. In addition, centrifugal fan generally does not have noise reduction treatment, and the noise environment is also relatively poor. Compared with centrifugal fan, axial flow fan has compact structure, easy installation, large flow, and can increase pressure through double-stage impeller, and is easy to realize noise reduction treatment. The following problems may occur during long-term use of ordinary axial flow fan:

[0003] 1) The use environment of ship fan is mostly salt mist and mold, which accelerates the aging of components in humid environment.

[0004] 2) The motor guide vane integrated casting axial flow fan has high component integration. If the motor needs to be repaired, the motor cannot be removed, and the component needs to be replaced together with the whole machine, which is not convenient for maintenance.

[0005] 3) The motor of the double-stage axial flow fan without guide vane is usually fixed by a support rod. The air accelerated by the impeller will cause turbulence when flowing through the support rod, which will affect the aerodynamic performance of the fan and increase the noise.

[0006] 4) The motor of the double-stage axial flow fan with rear guide vane uses guide vane as support structure, the guide vane root is welded to the fixed plate, the fixed plate is fixed to the motor housing through bolts and gaskets, and the guide vane top is welded to the fan housing. This structure is complex, has poor impact resistance, and is not convenient for maintenance and installation.

[0007] 5) The integrated casting axial flow fan is mainly composed of impeller, housing, motor, guide vane and other components. The advantages are high integration of fan structure, integration of fan guide vane and motor housing, and no need for late installation of motor. The disadvantages are that the motor cannot be removed for repair, the motor needs to be replaced if it cannot be repaired, and the whole machine needs to be replaced, which is not economical.

[0008] 6) The support rod structure commonly used in double-stage axial flow fan without guide vane can fix the motor in the housing. When the gas accelerated by the impeller flows through the support rod, the support rod becomes a turbulence component, which forms accelerated separation pocket and negatively affects the flow of gas, making it difficult to match the design requirements of the inlet flow of secondary impeller, resulting in reduced performance of the whole machine and increased noise.

[0009] 7) Impeller plus back guide vane double-stage axial flow fan, without affecting the performance of the fan, the back guide vane is used as a natural guide and support motor structure, but the guide vane blade root and the motor mounting plate need to be partially welded, considering the bending structure of the guide vane, only partial position welding can be performed with the mounting plate, and the impact resistance is weakened.

[0010] Therefore, under the condition of ship maintenance, the original centrifugal fan is replaced by an axial flow fan, the aerodynamic performance and structural stability of the fan are not affected, and the later installation, disassembly and maintenance are facilitated. SUMMARY

[0011] The utility model discloses a motor fixing structure of double-stage axial flow fan under the premise of not affecting the performance of double-stage axial flow fan, when the motor needs to be repaired, the motor can be extracted for repair, and the guide vane is installed outside the cylinder according to design requirement, the guide vane is used as a gas guide and motor support structure, and can also be used as a heat dissipation transmission component of the motor. The structure has the advantages of using mature standard motor, not needing to redesign the motor, not involving later verification, airflow can be smoothly transferred to the secondary impeller through the outer surface of the cylinder and the guide vane after working through the primary impeller, the efficiency of the whole machine is guaranteed, and energy consumption is reduced. Meanwhile, the motor is convenient to install and disassemble, and the maintenance efficiency is greatly improved.

[0012] To realize the above object, the technical scheme of the utility model is as follows: a motor fixing structure of double-stage axial flow fan is a cylindrical motor fixing structure arranged at the central axis position in the fan shell body, has a motor fixing cylinder, a plurality of cylinder inner wall boss surfaces are arranged in the motor fixing cylinder, the motor fixing cylinder is positioned and connected with the motor fixing surface of the motor shell body through the cylinder inner wall boss surfaces, and is fixed by bolt assemblies.

[0013] Further, four cylinder inner wall boss surfaces are arranged in the motor fixing cylinder, and the motor fixing surface of the motor outer shell body is coincident with the four cylinder inner wall boss surfaces.

[0014] Further, two motor fixing cylinder mounting holes are formed in each cylinder inner wall boss surface, correspond to the motor shell outer mounting holes, and are fixed with the motor shell body by eight bolt assemblies.

[0015] Further, the outer surface of the motor fixing cylinder is full-welded with the blade root of the fan guide vane.

[0016] Further, the blade top of the fan guide vane and the inner wall of the outer shell of the fan are full-welded.

[0017] The utility model has the advantages of:

[0018] Compared with the prior art, the utility model mainly improves that the utility model discloses a cylindrical motor fixing structure.

[0019] The cylindrical motor fixing structure is arranged at the central axis position inside the fan shell body, the motor fixing cylinder 3 is internally provided with four cylinder inner wall boss surfaces 4, two motor fixing cylinder mounting holes 7 are formed in each cylinder inner wall boss surface 4, correspond to the motor shell outer mounting hole, and are fixed through eight bolt assemblies.

[0020] The utility model solves the problems of difficult disassembly of the double-stage axial flow fan motor, small maintenance space and high replacement cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a schematic view of the cylindrical motor fixing structure of the utility model;

[0022] Fig. 2 It is a partial enlarged view of the cylinder inner wall boss surface and the motor fixing surface;

[0023] Fig. 3 It is a schematic view of the motor fixing cylinder mounting hole. DETAILED DESCRIPTION

[0024] The utility model will be further described in connection with the drawings and examples.

[0025] As shown in the drawings, Figs. 1 to 3 The utility model discloses a motor fixing structure of double-stage axial flow fan, which is a cylindrical motor fixing structure, comprising a fan external shell 1, a fan guide vane 2, a motor fixing cylinder 3, a cylinder inner wall boss surface 4, a motor fixing surface 5, a motor 6 and a motor fixing cylinder mounting hole 7.

[0026] The cylindrical motor fixing structure is arranged at the central axis position inside the fan shell body, the motor fixing cylinder 3 is internally provided with four cylinder inner wall boss surfaces 4, two motor fixing cylinder mounting holes 7 are formed in each cylinder inner wall boss surface 4, correspond to the motor shell outer mounting hole, and are fixed through eight bolt assemblies.

[0027] When the motor fails, first remove the impeller at both ends, then remove the 8 bolts on the motor fixing cylinder mounting hole 7, and the motor 6 can be axially extracted for maintenance. When installing, the motor can be initially positioned through the cylinder inner wall boss surface 4, and then adjusted radially to complete the installation. This structure is simple and easy to implement, and can be applied to similar structure axial flow fans, and has wider applicability.

[0028] The motor fixing structure of the two-stage axial flow fan has the following characteristics compared with the ordinary axial flow fan motor fixing structure:

[0029] (1) Four cylinder inner wall boss surfaces 4 are arranged in the motor fixing cylinder 3, and coincide with the motor fixing surface 5 of the motor shell.

[0030] (2) Two motor fixing cylinder mounting holes 7 are formed in each cylinder inner wall boss surface 4, corresponding to the motor mounting hole size, and are fixed by gaskets and bolts.

[0031] (3) The fan guide vane 2 root and the motor fixing cylinder 3 outer surface are fully welded and fixed, and the vane top and the fan outer casing 1 inner wall are fully welded and fixed.

[0032] The cylindrical motor fixing structure has the following advantages:

[0033] (1) The motor fixing cylinder structure is simple and easy to process and form. The gas after the first-stage impeller does work flows through the circular cylinder surface and the rear guide vane, without a turbulence component, without affecting the original airflow direction, without changing the flow area, and without affecting the aerodynamic performance.

[0034] (2) The space between the motor fixing cylinder and the motor can be used as a motor heat dissipation channel, and the gas flowing through the channel can dissipate heat from the motor, ensuring the performance of the motor.

[0035] (3) If the motor fails, the motor can be individually extracted for maintenance by disassembling the 8 bolt assemblies on the motor fixing cylinder, improving the utilization efficiency of the motor.

[0036] (4) Compared with the motor and fan guide vane integrated forming structure, the motor shell fixing cannot be removed, and if the motor needs to be repaired, the fan shell must be disassembled. If the motor is irreversibly damaged, the entire fan shell is damaged, the maintenance efficiency is low, and the economy is poor. The cylindrical motor fixing structure only needs to disassemble the bolt assemblies on the cylinder to disassemble the motor, and the smooth boss structure facilitates the later installation and fixation of the motor. The circular cylinder itself has a simple structure, small process implementation difficulty, and high structural strength,

[0037] (5) By disassembling the bolt assemblies, the fan and the motor are individually repaired, solving the problems of small ship maintenance space and high maintenance difficulty.

Claims

1. A motor fixing structure for a two-stage axial flow fan, characterized in that: It is a cylindrical motor fixing structure, arranged at the central axis position inside the fan casing, and has a motor fixing cylinder. Multiple cylinder inner wall bosses are arranged inside the motor fixing cylinder. The motor fixing cylinder is positioned and connected with the motor fixing surface of the motor casing through the cylinder inner wall bosses and fixed with a bolt assembly.

2. The motor fixing structure of the two-stage axial flow fan according to claim 1 is characterized in that: Four convex surfaces on the inner wall of the motor fixing cylinder are arranged inside the motor fixing cylinder and coincide with the motor fixing surface of the motor outer shell.

3. The motor fixing structure of the two-stage axial flow fan according to claim 1, characterized in that: Two motor fixing cylinder mounting holes are provided on the convex surface of the inner wall of each cylinder, corresponding to the mounting holes on the outer side of the motor casing, and are fixed to the motor casing by eight sets of bolt assemblies.

4. The motor fixing structure of the two-stage axial flow fan according to claim 1 is characterized in that: The outer surface of the motor fixing cylinder is fully welded and fixed to the blade roots of the fan guide vanes.

5. The motor fixing structure of the two-stage axial flow fan according to claim 4, characterized in that: The blade tips of the fan guide vanes are fully welded and fixed to the inner wall of the fan outer casing.

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