Marine fan impeller adjusting method and marine fan

Abstract

The invention belongs to the technical field of ships, and discloses a marine fan impeller adjusting method and a marine fan. The marine fan impeller adjusting method comprises the following steps that external parts of the fan are detached, a fan flange and a plurality of blades installed on the fan flange are placed on a working table, the fan flange is fixed to the working table, and the fan is fixed to the working table; measuring an original blade angle, measuring the angle of the blade tip of each blade by using a measuring tool, recording the angle as an original angle alpha, loosening a bolt which is positioned at the blade root of each blade and is connected with a fan flange, knocking one side of the blade root from the front surface or the back surface of each blade, measuring the angle of the blade tip of each blade by using the measuring tool, and recording the angle as the original angle alpha; the heightening angle of the blade is alpha + n, the lowering angle of the blade is alpha-n, and the bolt is fastened. According to the marine fan impeller adjusting method, by adjusting the angles of the blades, the stability and reliability of operation are guaranteed, and the unreasonable conditions that power is too large or too small under part of working conditions due to the fact that fan type selection is fixed are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a method for adjusting a marine fan impeller and a marine fan. Background Art

[0002] The blades of marine fans are usually adjusted before the fan leaves the factory and the blades and impeller are fixed before being installed directly on board.

[0003] Due to the complexity of the actual ship pipeline and other working conditions, the fan may not match the motor on the actual ship, resulting in the actual current exceeding the rated current, and the motor cannot be replaced at this time. Therefore, it is urgent to design a new marine fan impeller adjustment method and a marine fan to improve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a marine fan impeller adjustment method and a marine fan, so as to solve the technical problem that the fan selection is fixed and the unreasonable situation of excessive or insufficient power occurs under some working conditions.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The marine fan impeller adjustment method comprises the following steps:

[0007] S1: Fix the fan flange, disassemble the external parts of the fan, place the fan flange and a plurality of blades installed on the fan flange on a work surface, and fix the fan flange on the work surface;

[0008] S2: measuring the original blade angle, using a measuring tool to measure the angle at the tip of each blade, and recording it as the original angle α;

[0009] S3: adjusting the blade angle, loosening the bolts connected to the fan flange at the blade root of the blade, tapping one side of the blade root from the front or back of the blade, adjusting the blade deflection, and measuring the angle of the blade tip in real time by the measuring tool, the blade height adjustment angle is recorded as α+n, and the blade lowering angle is recorded as α-n;

[0010] S4: Fix the blades and tighten the bolts.

[0011] Preferably, step S3 and step S4 are repeated to complete the adjustment of all the blades, and the angle adjustment deviation between the blades is less than 0.05 degrees.

[0012] Preferably, in step S2, the measuring tool adopts an angle ruler and a pad. During measurement, the pad is placed at the bottom of the blade tip, and the upper end surface of the pad is kept in contact with the two sides of the bottom of the blade tip. The angle ruler is placed on the pad, and the display screen of the angle ruler is placed in a direction away from the blade root.

[0013] Preferably, in step S3, a rubber hammer is used to strike the blade root, and the higher side of the blade root is struck.

[0014] Preferably, before step S1, S0: disassemble the fan, and remove the grid and air guide cover of the fan.

[0015] Preferably, after step S4, S5: tighten the blades again, and tighten the bolts of all the blades again.

[0016] Preferably, after step S5, S6: checking the blade angles, using a measuring tool to check the angle of each blade again to achieve uniformity.

[0017] Preferably, after step S6, S7: installing the fan, installing the air guide cover and the casing on the fan.

[0018] A marine fan, using the above-mentioned marine fan impeller adjustment method to adjust the blades, comprises:

[0019] A fan flange, wherein a mounting groove is arranged on the circumferential side of the fan flange, and a plurality of the mounting grooves are provided, and the plurality of the mounting grooves are arranged at equal intervals along the circumference of the fan flange;

[0020] A blade, one end of the blade is a blade root, the other end is a blade tip, and the blade root of the blade is inserted into the mounting groove;

[0021] A fastener is connected between the blade and the fan flange and is used to fix the blade.

[0022] Preferably, the fasteners include bolts, and the blades are connected to the fan flange via the bolts.

[0023] Beneficial effects of the present invention:

[0024] By removing the external parts of the fan, leaving only the fan flange and the blades installed on the fan flange and placing them on the workbench or the ground, one operator fixes the position of the fan flange, and another operator holds a measuring tool to measure the angle of each blade one by one at the tip of the blade, and records the corresponding original angle α in the book. Then one operator loosens the bolts and knocks on the front or back of the blade to adjust the angle, and the other operator observes the angle value displayed by the measuring tool. Based on the original angle α, the angle is increased by α+n or decreased by α-n as needed. After the adjustment is completed, the bolts are tightened to complete the angle adjustment of the blade.

[0025] By adjusting the blade angle, it is possible to meet the needs of different air volumes and air pressures in different application scenarios, so as to flexibly meet various changes in working conditions, help improve the operating characteristics of the fan, reduce airflow pulsation or reduce noise, etc. According to the actual operating conditions, the fan can work in the optimal state, thereby reducing energy waste and improving the energy utilization efficiency of the entire system. It is also easy to achieve precise control of parameters such as ventilation volume, ensuring the stability and reliability of operation, and avoiding unreasonable situations such as excessive or insufficient power under certain working conditions due to fixed fan selection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a partial cross-sectional view of a marine fan provided by an embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of a marine fan provided by an embodiment of the present invention;

[0028] Figure 3 It is a flow chart of a marine fan impeller adjustment method provided by an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Fan flange; 2. Blades; 3. Bolts; 4. Air guide cover; 5. Casing; 6. Junction box; 7. Motor. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Due to the complexity of actual ship pipelines and other working conditions, the fan may not match the motor on the actual ship, causing the actual current to exceed the rated current, and the motor cannot be replaced at this time.

[0036] In order to solve the above problems, combined Figure 1-Figure 3 As shown, this embodiment provides a method for adjusting a marine fan impeller, which comprises the following steps:

[0037] In this embodiment, at least two operators are required to cooperate in the operation, one of whom is responsible for angle adjustment and the other is responsible for observing the angle.

[0038] S0: Dismantle the fan. Remove the casing 5 on the fan and the air guide cover 4 on the impeller, leaving only the fan flange 1 and several blades 2 installed on the fan flange 1. After removal, it is convenient for operators to adjust.

[0039] S1: Fix the fan flange 1. Place the fan flange 1 and several blades 2 installed on the fan flange 1 on the work surface, and the operator responsible for angle adjustment sits on the fan flange 1 or presses the fan flange 1. This achieves the fixation of the fan flange 1 and ensures that the fan flange 1 remains stationary during the subsequent adjustment of the blades 2.

[0040] The working table in this embodiment is preferably the ground, which is convenient for operators to operate. In other embodiments, it can also be a desktop or a frame.

[0041] S2: Measure the original blade 2 angle. Use a measuring tool to measure the angle at the tip of each blade 2 and record it as the original angle α. Specifically, the measuring tool uses an angle ruler and a pad. When measuring, place the pad at the bottom of the blade tip, and keep the upper end surface of the pad in contact with the bottom sides of the blade tip. Place the angle ruler on the pad, and place the display screen of the angle ruler in the direction away from the blade root. The operator responsible for observing the angle holds the pad to operate and reads the value on the display screen for recording.

[0042] S3: Adjust the angle of blade 2. Loosen the bolt 3 connected to the fan flange 1 at the root of blade 2, tap one side of the root of blade 2 from the front or back, adjust the deflection of blade 2, and measure the angle of the tip of blade 2 in real time through the measuring tool. The height adjustment angle of blade 2 is recorded as α+n, and the lowering angle of blade 2 is recorded as α-n.

[0043] Preferably, a rubber hammer is used to strike the blade root, and the higher side of the blade root is struck. The striking end of the rubber hammer is made of rubber material, which can reduce the possibility of deformation of the blade 2 due to excessive force by the operator, and can also complete the adjustment of the angle of the blade 2.

[0044] S4: Fix the blade 2. Tighten the bolt 3.

[0045] In summary, step S3 and step S4 are the adjustment process of one blade 2 , and the above steps S3 and step S4 need to be repeated to complete the adjustment of all blades 2 .

[0046] In addition, the angle adjustment deviation between the blades 2 is less than 0.05 degrees, and in other embodiments it can also be 0.01 degrees, 0.02 degrees, 0.03 degrees or 0.04 degrees, etc. The smaller the deviation, the better, and it is better if it is equal. This embodiment does not make specific limitations on this.

[0047] S5: Tighten the blade 2 again. Tighten the bolts 3 of all blades 2 again to avoid missing any.

[0048] S6: Check the angle of blade 2. Use a measuring tool to check the angle of each blade 2 again to achieve uniformity, ensuring that the angle deviation of each blade 2 is controlled within a reasonable range, that is, less than 0.05 degrees.

[0049] S7: Install the fan. Reinstall the grid frame and the air guide cover 4 onto the fan, and reset the fan so that the fan can operate normally.

[0050] It can be understood that by adjusting the blades 2 of the fan impeller, the fan has the following advantages:

[0051] 1) It can adapt to different working conditions. When different air volume and air pressure are required, the blades 2 of the impeller can be adjusted to flexibly meet various working conditions, and has good adaptability;

[0052] 2) Improves system efficiency, can be accurately adjusted according to actual operating conditions, so that the fan can operate in the best state, reduce energy waste, and improve the energy utilization efficiency of the entire system;

[0053] 3) Achieve precise control, which facilitates precise control of ventilation volume and other parameters, ensuring the stability and reliability of system operation;

[0054] 4) Avoiding "a big horse pulling a small cart" can avoid unreasonable situations where the power is too large or too small under certain working conditions due to fixed fan selection;

[0055] 5) Enhanced system adaptability. When system requirements change, there is no need to replace the entire fan. By adjusting the blades 2 of the fan impeller, it can better adapt to the new requirements, and the functional diversity is greatly improved;

[0056] 6) Optimizing operating performance helps improve the operating characteristics of the fan, such as reducing air flow pulsation, reducing noise, etc., and improving the overall performance of the fan.

[0057] It should be noted that after the fan impeller is adjusted, the fan needs to detect the current during operation and it must not exceed the rated current. Before leaving the factory, the accuracy of the dynamic balance of the fan blades has been adjusted to a very high level (vibration value: 7.1mm / s). Therefore, adjusting the angle of the fan impeller blade 2 will not affect its own dynamic balance, and there is no need to re-adjust the dynamic balance.

[0058] This embodiment also provides a marine fan, such as Figure 1 and Figure 2As shown, the marine fan uses the above-mentioned marine fan impeller adjustment method to adjust the blade 2. The marine fan includes a fan flange 1, a blade 2 and a fastener. The fan flange 1 is coaxially provided with a motor 7 for driving the fan to rotate. The peripheral side of the fan flange 1 is provided with a mounting groove, and a plurality of mounting grooves are provided. The plurality of mounting grooves are evenly spaced along the circumference of the fan flange 1. One end of the blade 2 is a blade root, and the other end is a blade tip. The blade root of the blade 2 is inserted into the mounting groove, and the fastener is connected between the blade 2 and the fan flange 1 to fix the blade 2. Specifically, the fastener includes a bolt 3, and the blade 2 is connected to the fan flange 1 through the bolt 3. Since the specific structure of the bolt 3 connecting the blade 2 and the fan flange 1 is a prior art, it will not be further described here.

[0059] In addition, the outer cover of the fan flange 1 and the blades 2 is provided with a guide cover 4, which can guide the airflow, reduce resistance, and protect the operation of key components such as the motor 7 and the shaft; the outside of the guide cover 4 and the motor 7 is also provided with a casing 5, and the outside of the casing 5 is provided with a junction box 6. The internal wiring of the marine fan is integrated in the junction box 6, and then connected to the power supply through the junction box 6.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A method for adjusting a marine fan impeller, characterized in that: The following steps are involved: S1: Fix the fan flange, disassemble the external parts of the fan, place the fan flange and a plurality of blades installed on the fan flange on a work surface, and fix the fan flange on the work surface; S2: measuring the original blade angle, using a measuring tool to measure the angle at the tip of each blade, and recording it as the original angle α; S3: adjusting the blade angle, loosening the bolts connected to the fan flange at the blade root of the blade, tapping one side of the blade root from the front or back of the blade, adjusting the blade deflection, and measuring the angle of the blade tip in real time by the measuring tool, the blade height adjustment angle is recorded as α+n, and the blade lowering angle is recorded as α-n; S4: Fix the blades and tighten the bolts.

2. The marine fan impeller adjustment method according to claim 1, characterized in that: Steps S3 and S4 are repeated to complete the adjustment of all the blades, and the angle adjustment deviation between the blades is less than 0.05 degrees.

3. The marine fan impeller adjustment method according to claim 1, characterized in that: In step S2, the measuring tool uses an angle ruler and a pad. During measurement, the pad is placed at the bottom of the blade tip, and the upper end surface of the pad is kept in contact with the two sides of the bottom of the blade tip. The angle ruler is placed on the pad, and the display screen of the angle ruler is placed in a direction away from the blade root.

4. The marine fan impeller adjustment method according to claim 1, characterized in that: In step S3, the blade root is struck with a rubber hammer, and the higher side of the blade root is struck.

5. The marine fan impeller adjustment method according to claim 1, characterized in that: Before step S1, S0: disassemble the fan, and remove the grid and air guide cover of the fan.

6. The marine fan impeller adjustment method according to claim 5, characterized in that: After step S4, S5: tighten the blades again, and tighten the bolts of all the blades again.

7. The marine fan impeller adjustment method according to claim 6, characterized in that: After step S5, S6: check the blade angles, and use a measuring tool to check the angle of each blade again to achieve uniformity.

8. The marine fan impeller adjustment method according to claim 7, characterized in that: After step S6, S7: installing the fan, installing the air guide cover and the casing on the fan.

9. A marine fan, wherein the blades are adjusted by the marine fan impeller adjustment method according to claims 1 to 8, characterized in that: include: A fan flange, wherein a mounting groove is arranged on the circumferential side of the fan flange, and a plurality of the mounting grooves are provided, and the plurality of the mounting grooves are arranged at equal intervals along the circumference of the fan flange; A blade, one end of the blade is a blade root, the other end is a blade tip, and the blade root of the blade is inserted into the mounting groove; A fastener is connected between the blade and the fan flange and is used to fix the blade.

10. The marine fan according to claim 1, characterized in that: The fasteners include bolts, and the blades are connected to the fan flange via the bolts.

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