Centrifugal fan convenient to disassemble and capable of adjusting air volume

Abstract

The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan convenient to disassemble and capable of adjusting air volume. Comprising a fan body, a front end cover and a rear end cover are arranged on the front side and the rear side of the fan body respectively, a fan shaft penetrates through the middle of the fan body, one end of the fan shaft is connected with a half coupler, a fan impeller is fixed to the other end of the fan shaft, and the fan impeller is arranged in a fan volute. The fan volute is provided with a fan inlet flange and a fan outlet flange, a motor support is installed on the side close to the inlet flange, a servo motor is arranged on the upper portion of the support, and the shaft end of the servo motor is connected with a driving gear. Two rotating shafts are arranged close to a fan outlet flange, the two ends of each rotating shaft are fixed in a fan volute through bearings, a driven gear is arranged at one end of each rotating shaft, and the two driven gears are horizontally arranged on the same side and meshed with the driving gear; through a servo motor and a gear transmission system, the opening degree of the air volume adjusting plate is adjusted in real time, production load changes can be quickly responded, and air volume dynamic matching is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field, concretely relates to a centrifugal fan of adjustable air volume convenient to dismount. BACKGROUND

[0002] Centrifugal fan is an indispensable key equipment in petrochemical industry, and is widely used in gas delivery, oxygen supply and waste gas discharge process links. It converts gas kinetic energy into pressure energy through high-speed rotating impeller, so as to realize efficient delivery and treatment of gas. However, with the increasing requirement of energy saving and equipment maintenance efficiency in petrochemical industry, the limitations of traditional centrifugal fan in design and application gradually appear, mainly in the following two aspects:

[0003] The traditional centrifugal fan usually adopts fixed air volume design, when the production device load decreases, the fan still runs at constant power, which leads to that the actual output air volume is far more than the demand, causing serious energy waste. Although some fans try to adjust the air volume through frequency conversion motor or baffle, but such method has problems such as response lag, low adjustment precision, etc., it is difficult to realize real-time accurate control, and cannot meet the adaptability demand of dynamic load change in petrochemical production.

[0004] The impeller maintenance of the existing centrifugal fan needs to dismount the inlet flange, outlet flange or cut part of the volute structure of the fan, which not only consumes time and effort, but also easily causes damage to the flange sealing element, increases the maintenance cost. In addition, frequent dismounting may cause the equipment assembly precision to decrease, affecting the stability and safety of long-term operation of the fan.

[0005] In view of the above problems, the industry urgently needs a centrifugal fan with high efficient air volume adjustment capacity and convenient maintenance structure, to reduce energy consumption, improve operation and maintenance efficiency, and adapt to the development trend of high efficiency and intelligentization of petrochemical production. UTILITY MODEL CONTENTS

[0006] The utility model provides a centrifugal fan of adjustable air volume convenient to dismount, its purpose lies in providing a centrifugal fan of adjustable air volume convenient to dismount. The air volume adjusting plate is arranged at the outlet of the centrifugal fan volute, the angle of the air volume adjusting plate can be adjusted in real time according to the load of the production device, and then the function of adjusting the air volume is played, the production cost is reduced, in addition, the impeller can be quickly removed as a whole when the fan is inspected and maintained, the maintenance cost is reduced, and the inspection and maintenance efficiency is improved.

[0007] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0008] A centrifugal fan of adjustable air volume convenient to dismount, comprising a fan body,

[0009] The fan body is provided with a front end cover and a rear end cover on the front and rear sides respectively, a fan shaft is arranged through the middle, one end of the fan shaft is connected with a half coupling, and the other end is fixed with a fan impeller, and the fan impeller is arranged in a fan volute;

[0010] The fan volute is provided with a fan inlet flange and a fan outlet flange, a motor support is arranged close to the inlet flange, a servo motor is arranged on the upper portion of the support, and the servo motor shaft end is connected with a driving gear;

[0011] Two rotating shafts are arranged close to the fan outlet flange, the rotating shafts are fixed in the fan volute through bearings, a driven gear is arranged at one end of each rotating shaft, and the two driven gears are arranged horizontally on the same side and meshed with the driving gear;

[0012] The rotating shafts are fixedly connected with air volume adjusting plates in the middle portions, and the plate bodies are gradually thinned from the middle portions to the two ends to form a slope to reduce air resistance.

[0013] Further, the slope of the air volume adjusting plate gradually decreases in thickness from the middle portion to the two ends to optimize the airflow path and reduce energy consumption.

[0014] Further, one end of the rotating shaft is provided with an indicating needle corresponding to an indicating scale for displaying the opening degree of the air volume adjusting plate in real time.

[0015] Further, the servo motor is controlled through a control panel to drive the driving gear to rotate the driven gear, so as to adjust the opening degree of the air volume adjusting plate.

[0016] Further, the fan volute is provided with a volute rear cover close to one side of the fan body, and the volute rear cover is connected through bolts and provided with a leak-proof O-ring.

[0017] Further, the volute rear cover is connected with the fan volute through a bolt connection structure, so that the impeller can be quickly disassembled without cutting or disassembling the inlet / outlet flange.

[0018] Further, the air volume adjusting plate is provided with a reinforcing rib in the middle portion.

[0019] The utility model discloses reached the beneficial effects are as follows:

[0020] Through the cooperative action of the servo motor, the gear transmission system (driving gear and driven gear) and the control panel, the opening degree of the air volume adjusting plate can be adjusted in real time, the production load change can be quickly responded, and dynamic matching of air volume can be realized.

[0021] The slope design (gradually thinning from the middle portion to the two ends) of the air volume adjusting plate significantly reduces the resistance of the air outlet and reduces turbulent loss.

[0022] The modular volute rear cover is connected by bolts and is equipped with a leak-proof O-ring, so that the impeller can be removed as a whole by only dismounting the rear cover during maintenance, avoiding the complicated operation of dismounting the inlet flange, the outlet flange or cutting the volute in the traditional way.

[0023] The reinforcing ribs arranged in the middle of the air volume adjusting plate significantly improve the impact resistance and deformation resistance of the air volume adjusting plate, and the adjusting plate can still maintain stable opening degree and prolong the service life of the equipment under high pressure or high flow conditions.

[0024] The rotating shaft is supported by double bearings at both ends, reducing vibration and wear, and ensuring transmission accuracy and long-term operation reliability.

[0025] The indicating needle at the end of the rotating shaft cooperates with the scale to intuitively display the opening degree of the air volume adjusting plate, and the operator can quickly set the target air volume according to the production demand, improving the process adaptability.

[0026] The leak-proof O-ring between the volute rear cover and the fan volute effectively seals the gas passage, eliminates the risk of gas leakage caused by dismounting and maintenance, and ensures the safety of the equipment operating environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in these drawings without creative labor for those skilled in the art.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0029] Figure 2 It is a front view of the present application.

[0030] Figure 3 It is a left view of the present application.

[0031] Figure 4 It is a top view of the present application.

[0032] Figure 5 It is a schematic diagram of the structure of the air volume adjusting plate of the present application.

[0033] Figure 6 It is a sectional view of the present application Figure 2 at A-A.

[0034] Explanation of reference numerals in the drawings:

[0035] 1, fan body; 101, front end cover; 102, rear end cover; 2, fan shaft; 3, half coupling; 4, fan volute; 401, fan inlet flange; 402, fan outlet flange; 403, volute rear cover; 404, leak-proof O-ring; 5, fan impeller; 6, control panel; 7, servo motor; 701, motor support; 8, driving gear; 801, driven gear B; 9, air volume adjusting plate; 901, reinforcing rib; 10, rotating shaft; 1001, indicating needle; 1002, indicating scale; 1003, bearing.

[0036] The realization, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0038] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0039] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B schemes. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0040] Reference Figures 1-4The utility model provides a kind of centrifugal fan of adjustable air volume for easy disassembly, including fan body 1, the front and rear sides of the fan body 1 are provided with front end cover 101 and rear end cover 102, fan shaft 2 is arranged in the middle position of the fan body 1 and passes through front end cover 101 and rear end cover 102, one end of the fan shaft 2 is provided with half coupling 3, the other end of the fan shaft 3 is provided with fan impeller 5, the fan impeller 5 is arranged in fan volute 4, the fan volute 4 is provided with fan inlet flange 401 and fan outlet flange 402, motor support 701 is provided on the side of the fan volute 4 towards fan inlet flange 401, servo motor 7 is arranged on the upper portion of the motor support 701, driving gear 8 is arranged on the side of the shaft end of the servo motor 7, two rotating shafts 10 are arranged near fan outlet flange 402, two bearings 1003 are arranged on the two ends of the two rotating shafts 10 and in fan volute 4, one driven gear 801 is arranged on the one end of each rotating shaft 10, the two driven gears 801 are arranged on the same side and on the same horizontal line, and the driving gear 8 is engaged with the two driven gears 801 respectively.

[0041] Referring to Figure 1 , Figure 4 , air volume adjusting plate 9 is arranged in the middle position of rotating shaft 10, reinforcing rib 901 is arranged in the middle position of air volume adjusting plate 9, which can improve the strength of air volume adjusting plate 9 and increase the impact resistance of air volume adjusting plate 9.

[0042] Referring to Figure 5 , air volume adjusting plate 9 has a certain slope, and the thickness gradually decreases from the middle position to both ends, which can reduce the resistance of air outlet to air volume, increase the speed, reduce energy consumption, make the fan more energy-saving.

[0043] Referring to Figures 1-4 , control panel 6 is arranged on one side of servo motor 7, the control panel 6 is electrically connected with servo motor 7, by operating control panel 6, servo motor 7 can realize forward rotation or reverse rotation, driving gear 8 drives driven gear 801 to realize forward rotation or reverse rotation, so that the opening size of air volume adjusting plate 9 can be adjusted, and the air supply of the device is changed, to achieve the effect of energy saving and consumption reduction.

[0044] Referring to Figure 3 , indicating needle 1001 is arranged on the end of rotating shaft 10 on the left side of driving gear 801, 0-100% indicating scale 1002 is arranged on one side of indicating needle 1001, by operating control panel 6, the position indicated by indicating needle 1001 is combined, so that the opening size of air volume adjusting plate 9 is judged, and the air volume matched with the load of production device can be supplied according to the load of production device.

[0045] Referring to Figure 6The fan volute 4 is provided with a volute rear cover 403 on the side close to the fan body 1. The volute rear cover 403 is bolt-connected with the fan volute 4, and an anti-leakage O-ring 404 is arranged between the volute rear cover 403 and the fan volute 4. When overhauling, the fan impeller 5 can be removed by dismounting the bolts between the fan volute 4 and the volute rear cover 403, avoiding the need to dismount the fan inlet flange 401 bolts and the fan outlet flange 402 bolts or cut the volute close to the fan body 1, thus greatly reducing the maintenance cost and improving the overhauling efficiency. In addition, the anti-leakage O-ring 404 arranged between the volute rear cover 403 and the fan volute 4 can prevent air leakage, improving the safety of the equipment operation.

[0046] In the scheme, when a centrifugal fan is used, according to the size of the load in the device production, the servo motor 7 is powered on, and then the driving gear 8 drives the driven gear 801 to rotate by operating the control panel 6, so as to adjust the opening of the air volume adjusting plate 9, and the change of the indicating needle 1001 on the indicating scale 1002 is observed. When the air volume required by the fan is reached, the operation is stopped, so as to realize the precise air supply of the production device, not only guaranteeing the normal air supply of the production device, but also achieving the purpose of energy saving and consumption reduction. In addition, when overhauling, the fan impeller 5 can be removed by dismounting the bolts between the fan volute 4 and the volute rear cover 403, avoiding the need to dismount the entire fan volute 4, thus reducing the maintenance cost and labor cost and improving the overhauling efficiency.

[0047] The above is only the optional embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation or direct / indirect application in other related technical fields under the utility model concept of the utility model is included in the patent protection range of the utility model.

Claims

1. A centrifugal fan with adjustable air volume for easy disassembly, comprising a fan body (1), characterized in that: The fan body (1) is provided with a front end cover (101) and a rear end cover (102) on both sides, and a fan shaft (2) is arranged through the middle, one end of the fan shaft (2) is connected with a half coupling (3), the other end is fixed with a fan impeller (5), and the fan impeller (5) is arranged in a fan volute (4); The fan volute (4) is provided with a fan inlet flange (401) and a fan outlet flange (402), a motor support (701) is installed near the inlet flange (401), a servo motor (7) is arranged on the upper part of the support, and the shaft end of the servo motor (7) is connected with a driving gear (8); Two rotating shafts (10) are arranged near the fan outlet flange (402), the rotating shafts (10) are fixed in the fan volute (4) through bearings (1003) at both ends, one end of each rotating shaft (10) is provided with a driven gear (801), and the two driven gears (801) are arranged horizontally on the same side and meshed with the driving gear (8); The rotating shaft (10) is fixedly connected with an air volume adjusting plate (9) in the middle, and the plate body is gradually thinned from the middle to both ends to form an inclination to reduce air resistance.

2. The centrifugal fan of claim 1, wherein: The inclination of the air volume adjusting plate (9) decreases in thickness from the middle to both ends to optimize the airflow path and reduce energy consumption.

3. The centrifugal fan of claim 1, wherein: One end of the rotating shaft (10) is provided with an indicating needle (1001) corresponding to an indicating scale (1002) for real-time display of the opening of the air volume adjusting plate (9).

4. The centrifugal fan of claim 1, wherein: The servo motor (7) is adjusted and controlled through a control panel (6), drives the driving gear (8) to rotate the driven gear (801), so as to adjust the opening of the air volume adjusting plate (9).

5. The centrifugal fan of claim 1, wherein: The fan volute (4) is provided with a volute rear cover (403) near one side of the fan body (1), which is connected by bolts and provided with a leak-proof O-ring (404).

6. The centrifugal fan of claim 5, wherein: The bolt connection structure of the volute rear cover (403) and the fan volute (4) realizes quick disassembly of the impeller (5) without cutting or disassembling the inlet / outlet flange.

7. The centrifugal fan of claim 1, wherein: The air volume adjusting plate (9) is provided with a reinforcing rib (901) in the middle.

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