A collector adjustment method and a fan using the collector

Abstract

The present application relates to a collector adjustment method, which relates to the field of collectors, and includes the following steps: S1, calculating the gap between the collector and the impeller after thermal expansion; S2, adjusting the gap between the fan collector and the impeller according to the calculation result; S3, judging whether the impeller scrapes the inner wall of the collector when rotating. The present application has the effect of facilitating the formation of a more appropriate gap between the collector and the impeller, thereby improving the working efficiency of the fan.

Description

Technical Field

[0001] The present application relates to the field of current collectors, and in particular to a current collector adjustment method and a fan using the current collector. Background Art

[0002] When the fan is working, the airflow enters the blade space from the fan axis, and then the airflow is driven by the impeller to rotate with the impeller on the one hand; on the other hand, the airflow increases its energy under the action of inertia and leaves the impeller in the radial direction. A fan that relies on the centrifugal force generated to do work is called a centrifugal fan.

[0003] The process of airflow flowing from the air inlet box into the impeller is a process in which the mainstream direction of the airflow changes from radial to axial and then to radial. The collector is located between the air inlet box and the impeller. Its function is to guide the upstream airflow into the impeller evenly and smoothly, playing a connecting role.

[0004] However, if the gap between the fan collector and the impeller is too large, the fan's operating efficiency will be low. If the gap is too small, it will cause scratches between the collector and the impeller insertion depth. At the same time, since metal will expand when heated, the collector after thermal expansion may scratch the impeller, so forming a more appropriate gap between the collector and the impeller becomes a problem. Summary of the invention

[0005] In order to facilitate the formation of a more appropriate gap between the collector and the impeller, thereby improving the working efficiency of the fan, the present application provides a collector adjustment method and a fan using the collector.

[0006] In the first aspect, a current collector adjustment method provided in the present application adopts the following technical solution:

[0007] A current collector adjustment method comprises the following steps:

[0008] S1. Calculate the gap between the collector and the impeller after thermal expansion;

[0009] S2. Adjust the gap between the fan collector and the impeller according to the settlement results;

[0010] S3. Determine whether the impeller scrapes the inner wall of the collector when rotating.

[0011] By adopting the above technical solution, by calculating the gap between the collector and the impeller after thermal expansion, and then adjusting the gap between the collector and the impeller before thermal expansion, space is reserved for the expansion of both the collector and the impeller, so as to form a more appropriate gap between the collector and the impeller, thereby improving the working efficiency of the fan.

[0012] Preferably, the calculation of the gap between the collector and the impeller after thermal expansion includes:

[0013] The theoretical calculation formula for metal thermal expansion is △L=α·L·△t. According to the theoretical calculation formula for metal thermal expansion, the lengths of △L impeller, △L fan casing base support plate + collector (upper half) to the top of the fan casing, △L fan casing base support plate + collector (lower half) to the bottom of the fan casing, △L left fan casing + collector (left half) to the center of the fan shaft, and △L right fan casing + collector (right half) to the center of the fan shaft are obtained.

[0014] The gap between the upper, lower, left, and right sides of the collector after thermal expansion and the impeller after thermal expansion = △L original gap + △L impeller / 2-△L. The diameter of the collector is adjusted according to the gap between the upper, lower, left, and right sides of the collector after thermal expansion and the impeller after thermal expansion.

[0015] By adopting the above technical solution, the thermal expansion of the collector side is calculated according to the theoretical calculation formula of metal thermal expansion, and the thermal expansion of the impeller is calculated at the same time. On the basis of the original gap between the collector and the impeller, half of the thermal expansion of the impeller is added, and the thermal expansion of one side of the collector is subtracted, so that the gap between the collector and the impeller after thermal expansion can be obtained. In this way, the gap between the thermal expansion of the collector and the impeller can be adjusted according to the gap after thermal expansion of the two, so as to achieve the purpose of forming a more suitable gap between the collector and the impeller.

[0016] Preferably, adjusting the gap between the fan collector and the impeller according to the settlement result includes: locally heating the original collector arc surface with oxygen and acetylene, and adjusting the shape in sequence with a hand hammer.

[0017] By adopting the above technical solution, the arc surface of the collector is locally heated, and the arc surface of the collector is struck with a hammer to adjust the size of the collector, thereby facilitating the adjustment of the gap between the collector and the impeller.

[0018] Preferably, the arcuate surface of the current collector is cut to facilitate the operator to adjust the shape, and after the adjustment is completed, the arcuate surface weld is welded and polished.

[0019] By adopting the above technical solution, when the size of the current collector to be adjusted is large, the adjustment can be completed by cutting the arc surface of the current collector.

[0020] In the second aspect, the present application provides a fan using the current collector adopting the following technical solution:

[0021] A fan using the collector comprises a mounting shell and a collector body located at an opening at one end of the mounting shell, the collector body comprises two arcuate rings spliced ​​to each other, the two arcuate rings move in directions away from or approaching each other to adjust the diameter of the collector body, and a locking mechanism is connected to the mounting shell to lock the two arcuate rings.

[0022] By adopting the above technical solution, the locking mechanism is adjusted so that the two arc rings can move relative to each other. At this time, the two arc rings can be controlled to move towards or away from each other, thereby adjusting the size of the collector and facilitating the adjustment of the gap between the collector and the impeller.

[0023] Preferably, both ends of one of the arc-shaped rings are fixedly connected with a first connecting block, and both ends of the other arc-shaped ring are fixedly connected with a second connecting block, one first connecting block corresponds to one second connecting block, and a plurality of convex teeth are provided on the sides of the first connecting block and the second connecting block close to each other, and the first connecting block and the second connecting block are meshed with each other.

[0024] By adopting the above technical solution, when the size of the collector needs to be adjusted, the first connecting block and the second connecting block are moved toward or away from each other. After the movement is completed, the convex teeth between the first connecting block and the second connecting block are engaged with each other, so that the two arc rings are spliced ​​more tightly with each other, reducing the occurrence of air leakage on the side wall of the collector, thereby facilitating improving the working efficiency of the fan.

[0025] Preferably, the locking mechanism includes an annular plate fixedly connected to one end of the mounting shell, and also includes two clamping plates, each clamping plate corresponds to the joint of the two arc rings, and the clamping plate and the annular plate both clamp the two arc rings, and each clamping plate is connected to the annular plate by a fastener.

[0026] By adopting the above technical solution, loosening the fasteners allows the clamping plate to move away from the annular plate, which facilitates the relative movement of the two arc rings. After the adjustment is completed, the clamping plate is pressed against the joint of the two arc rings, and the clamping plate and the annular plate are locked by the fasteners, which is simple and convenient to operate.

[0027] Preferably, a through groove is provided on the side of the joint of the two arc rings facing away from the annular plate, and reinforcement plates are provided on the inner and outer sides of the joint of the two arc rings. The two reinforcement plates clamp the two arc rings and a reinforcement spring is fixedly connected between the two reinforcement plates. The reinforcement spring is placed in the through groove, and the clamping plate presses against the side of the two reinforcement plates facing away from the annular plate.

[0028] By adopting the above technical solution, the two reinforcement plates are clamped at the joint of the two arc rings under the action of the reinforcement spring, thereby reinforcing the connection between the two arc rings. The clamping plate presses against the joint of the two arc rings and at the same time presses against the side of the two reinforcement plates away from the annular plate, so that the state of the two reinforcement plates clamping the joint of the two arc rings is relatively stable.

[0029] Preferably, a rectangular parallelepiped adjusting block is rotatably connected to the bottom wall of the through slot, and when the adjusting block supports the two reinforcing plates along its own length direction, the two reinforcing plates are separated from the collector body.

[0030] By adopting the above technical solution, the two reinforcement plates are pulled away from each other so that the two reinforcement plates are separated from the joint of the two arc rings. Then the adjustment block is rotated to support the two reinforcement plates in the length direction of the adjustment block. The two reinforcement plates are kept separated from the joint of the two arc rings by the support force of the adjustment block, which facilitates the relative movement of the two arc rings.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. It is convenient to form a more appropriate gap between the collector and the impeller, thereby improving the working efficiency of the fan;

[0033] 2. The two arc-shaped rings can be controlled to move towards or away from each other, thereby adjusting the size of the collector and facilitating the adjustment of the gap between the collector and the impeller;

[0034] 3. The two arc rings are spliced ​​more stably and are convenient for the two arc rings to move relative to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the installation shell and the collector body embodied in an embodiment of the present application.

[0036] Figure 2 It is a schematic diagram of the structure of two arc-shaped plates spliced ​​together according to an embodiment of the present application.

[0037] Figure 3 It is a schematic diagram of the structure of the reinforcement component embodied in an embodiment of the present application.

[0038] Explanation of the accompanying drawings: 1. Mounting shell; 2. Collector body; 21. First arc ring; 211. First connecting block; 2111. Groove; 2112. Through groove; 22. Second arc ring; 221. Second connecting block; 3. Locking mechanism; 31. Annular plate; 311. Sliding groove; 32. Clamping plate; 4. Reinforcement assembly; 41. Reinforcement plate; 411. Sliding block; 42. Reinforcement spring; 43. Adjustment block. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-Figure 3 This application is described in further detail.

[0040] The embodiment of the present application discloses a current collector adjustment method. The current collector adjustment method comprises the following steps:

[0041] S1. Calculate the gap between the collector and the impeller after thermal expansion;

[0042] S2, fan power off;

[0043] S3. Adjust the gap between the fan collector and the impeller according to the settlement result;

[0044] S4. Determine whether the impeller scrapes the inner wall of the collector when rotating;

[0045] S5. Turn on the fan.

[0046] Calculate the gap between the collector and the impeller after thermal expansion: The theoretical calculation formula for metal thermal expansion is △L=α·L·△t, (unit: mm), where △L-thermal expansion, mm; α-linear expansion coefficient, mm / mm℃; L-length of the object for which metal thermal expansion needs to be calculated, mm; △t-temperature difference between the medium in the container and the outside, ℃.

[0047] According to the theoretical calculation formula of metal thermal expansion, the lengths of △L impeller, △L fan casing base support plate + collector (upper half) to the top of the fan casing, △L fan casing base support plate + collector (lower half) to the bottom of the fan casing, △L left side fan casing + collector (left half) to the center of the fan shaft, and △L right side fan casing + collector (right half) to the center of the fan shaft are calculated.

[0048] The fan in this embodiment is supported by a single-sided cantilever. After consulting the data, the fan casing base support plate is used as the central dividing surface, and is divided into an upper casing + collector (upper half) and a lower casing + collector (lower half). The sum of the expansion calculations is the total expansion of the fan casing.

[0049] The gap after thermal expansion between the fan casing base support plate + collector (upper half) to the top of the fan casing is △L original gap + △L impeller / 2-△L fan casing base support plate + collector (upper half) to the top of the fan casing. Similarly, the gap after thermal expansion between the collector and the impeller can be calculated above, below, left and right respectively, to determine whether the gap between the collector and the impeller needs to be adjusted.

[0050] Specifically, the material of the fan in this embodiment is Q235, and its linear expansion coefficient α is 0.000001mm / mm℃. When the fan is used in a rotary kiln, according to the formula, the temperature of the medium inside the kiln head fan is 90℃; the ambient temperature is 20℃, so the temperature difference between the medium in the container and the outside is: △t=90-20=70℃. The actual measurement on site is carried out with an infrared thermometer, and the actual measured temperature is basically consistent with the measured value.

[0051] The diameter of the fan impeller used in the rotary kiln is 2400mm, and the thermal expansion of the fan impeller is: △L=α·L·△t=12.2x0.000001x2400x70=2.0496mm≈2mm;

[0052] The length from the fan casing base support plate + collector (upper half) to the top of the fan casing is 3200mm, and the thermal expansion is: △L1=α·L·△t=12.2x0.000001x3200x70=2.7328mm≈3mm;

[0053] The length from the fan housing base support plate + collector (lower half) to the bottom of the fan housing is 650mm, and the thermal expansion is: △L2=α·L·△t=12.2x0.000001x650x70=0.5551mm≈1mm;

[0054] The length from the left fan housing + collector (left half) to the center of the fan shaft is 1900mm, and the thermal expansion is: △L3=α·L·△t=12.2x0.000001x1900x70=1.6226mm≈2mm;

[0055] The length from the right fan housing + collector (right half) to the center of the fan shaft is 2300mm, and the thermal expansion is: △L4=α·L·△t=12.2x0.000001x2300x70=1.9642mm≈2mm;

[0056] Since the expansion of the left fan casing + collector (left half) and the right fan casing + collector (right half) are 2mm and 2mm respectively, neither exceeds the expansion of the upper half of the casing of 3mm, they are not taken into consideration.

[0057] The calculation results of the clearance between the collector and the impeller are as follows:

[0058] Since the thermal expansion of the impeller is calculated to be 2 mm, the thermal expansion of the upper and lower impellers is 2÷2=1;

[0059] The original plan was to adjust the distance between the collector and the top of the impeller inlet ring to 15 mm, so the gap after thermal expansion is: 15 + thermal expansion of the upper part of the impeller - △L1 = 15 + 1-3 = 13;

[0060] The original plan was to adjust the gap between the collector and the bottom of the impeller inlet ring to 12 mm, so the gap after thermal expansion is: 12 + thermal expansion of the lower part of the impeller - △L2 = 12 + 1-1 = 12;

[0061] After thermal expansion, the top gap between the collector and the impeller is 13mm, and the bottom gap is 12mm. The gap is small and it can continue to work after thermal expansion, which meets the technical requirements.

[0062] Therefore, according to the calculated data, the collector is 15mm away from the top of the impeller inlet ring and 12mm away from the bottom. The original plan of 20mm away from the left and 20mm away from the right of the impeller inlet ring is retained, which meets the working conditions and can improve the efficiency of the fan.

[0063] Power off the fan: Before the renovation work, the construction personnel need to obtain the confined space operation ticket, hoisting operation ticket and temporary use of 24V low-voltage safety lighting from the Safety and Environmental Protection Department and put them on record. The post personnel implement the safe power off ticket system, power off the fan, and take safety measures such as locking the on-site switch.

[0064] Adjust the gap between the fan collector and the impeller according to the settlement results: the construction personnel need to use a crane to remove the fan inlet shutters, and adjust the gap in the circumferential direction according to the fan collector gap measured by the mechanical technicians. The construction personnel use oxygen and acetylene to locally heat the original collector arc surface, and use a hammer to adjust the shape in turn. If the heating adjustment is difficult, the collector arc surface can also be cut during the process to facilitate the operator to adjust the shape. After the adjustment is completed, the arc surface weld is welded and polished to ensure its smoothness.

[0065] Determine whether the impeller scrapes the inner wall of the collector when it rotates: manually turn the wheel to see whether the impeller scrapes the bell mouth of the collector when it rotates.

[0066] After adjusting the gap between the collector and the impeller, the fan full pressure efficiency increased to 69.8% and the operating effect was good. The specific calibration report is as follows:.

[0067] parameter unit Numeric Fan inlet flow M3 / h 279266 Full pressure rise Pa 2224 Fan shaft power kW 247 Fan speed Hz 37.89 efficiency ％ 69.8 Kiln feed amount t / h 200 Rated power of motor kW 450

[0068] Based on the annual operation time of 8 months, totaling 240 days, and the direct power supply to large users at 0.5 yuan per kilowatt-hour, the electricity cost savings are calculated as follows:

[0069] (1) Manufacturer's calculation: Fan efficiency improvement x motor rated power = (69.8% - 57.1%) x 450 x 24 x 240 x 0.5 = 164,592 yuan;

[0070] (2) Conservative calculation: Fan efficiency improvement x input power = (69.8% - 57.1%) x 247 x 24 x 240 x 0.5 = 90,342.72 yuan;

[0071] To sum up, according to conservative calculations by the manufacturer and ourselves, the fan efficiency was 57.1% before the transformation. After the transformation, the fan efficiency was increased to 69.8%. The manufacturer calculated the electricity cost savings: about 165,000 yuan, and we conservatively calculated the electricity cost savings: about 90,000 yuan.

[0072] The present application also discloses a fan using the current collector, referring to Figure 1, including a mounting shell 1 and a current collector body 2 located at an opening at one end of the mounting shell 1. In order to adjust the diameter of the current collector body 2 according to the calculation result of the thermal expansion amount, the current collector body 2 includes two arc rings spliced ​​to each other. The two arc rings can move in a direction away from or close to each other to adjust the diameter of the current collector body 2. The mounting shell 1 is connected to a locking mechanism 3, which locks the two arc rings.

[0073] Reference Figure 1 and Figure 2 The arc ring includes a first arc ring 21 and a second arc ring 22. Both ends of the first arc ring 21 are fixedly connected with a first connection block 211, and both ends of the second arc ring 22 are fixedly connected with a second connection block 221. One first connection block 211 corresponds to one second connection block 221, and a surface of the first connection block 211 and the second connection block 221 close to each other is provided with a plurality of convex teeth, and the first connection block 211 and the second connection block 221 are meshed with each other. When it is necessary to increase the diameter of the collector body 2, the two arc rings are pulled away from each other until the first connection block 211 and the second connection block 221 are meshed with each other again, thereby reducing the air leakage at the side wall of the collector body 2.

[0074] The locking mechanism 3 includes an annular plate 31 fixedly connected to an opening at one end of the mounting housing 1, and two arc-shaped rings are spliced ​​together and abut against a side of the annular plate 31 away from the mounting housing 1. Two clamping plates 32 are provided on the side of the two arc-shaped rings away from the mounting housing 1, and each clamping plate 32 is located at the splicing of the two arc-shaped rings, and the clamping plate 32 abuts against the splicing of the two arc-shaped rings. Each clamping plate 32 is fastened to the annular plate 31 by bolts and nuts, and each clamping plate 32 and the annular plate 31 clamp and fix the two arc-shaped rings together.

[0075] Reference Figure 2 and Figure 3 In order to further make the two arc rings more tightly spliced ​​together, each splicing point of the two arc rings is connected with a reinforcement component 4.

[0076] The reinforcement assembly 4 includes two reinforcement plates 41 located at the upper and lower sides of the joint of the two arc-shaped rings, and a groove 2111 is provided on the inner side of the first connection block 211. The two reinforcement plates 41 clamp the joint of the two arc-shaped rings, and one of the reinforcement plates 41 is clamped in the corresponding groove 2111. The inner side surface of the reinforcement plate 41 clamped in the groove 2111 is located on the same smooth arc surface as the inner side surface of the collector.

[0077] Two through grooves 2112 are provided on one side wall of the joint of the two arc rings away from the annular plate 31, and a reinforcing spring 42 is provided on the side of the current collector away from the annular plate 31. The reinforcing spring 42 is located in the through groove 2112 and between the two reinforcing plates 41, and each end of the reinforcing spring 42 is fixedly connected to a reinforcing plate 41. The two reinforcing plates 41 clamp the joint of the two arc rings under the action of the reinforcing spring 42, thereby reinforcing the joint of the two arc rings.

[0078] Two long strip sliding grooves 311 are provided on the side of the annular plate 31 away from the mounting housing 1. The sliding grooves 311 are arranged in a direction away from the axis of the annular plate 31. A sliding block 411 is fixedly connected to one end of each reinforcing plate 41 close to the annular plate 31. Each group of reinforcing plates 41 corresponds to a sliding groove 311, and the sliding blocks 411 connected to each group of reinforcing plates 41 are slidably connected to a corresponding sliding groove 311. The sliding groove 311 is a dovetail groove, so that the sliding block 411 is not easy to be separated from the sliding groove 311.

[0079] When there is no need to move the two arc rings, the clamping plate 32 presses against the connection between the two arc rings and the two reinforcing plates 41 . The clamping plate 32 further reinforces the connection between the two arc rings by limiting the movement of the two reinforcing plates 41 .

[0080] When the two arc rings need to be moved relative to each other, the bolts and nuts are first loosened to separate the clamping plate 32 from the two reinforcing plates 41 , and then the two reinforcing plates 41 are pulled away from each other until the two reinforcing plates 41 are separated from the arc rings.

[0081] A rectangular parallelepiped adjusting block 43 is rotatably connected to a side of the second connecting block 221 away from the annular plate 31 . The length of the adjusting block 43 is greater than the distance between the two reinforcing plates 41 when clamping the two arc rings.

[0082] Pull the two reinforcing plates 41 away from each other until the two reinforcing plates 41 are separated from the two arc rings, and then rotate the adjustment block 43 until the adjustment block 43 supports the two reinforcing plates 41 to be separated from the two arc rings, so that the construction personnel can move the two arc rings relatively easily. The rectangular adjustment block 43 can support the two reinforcing plates 41 more stably.

[0083] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fan using a current collector, It is characterized in that The current collector adjustment method comprises the following steps: S1. Calculate the gap between the collector and the impeller after thermal expansion; S2. Adjust the gap between the fan collector and the impeller according to the calculation results; S3, determine whether the impeller scrapes the inner wall of the collector when rotating; The fan comprises a mounting shell (1) and a collector body (2) located at an opening at one end of the mounting shell (1); the collector body (2) comprises two arc-shaped rings spliced ​​to each other; the two arc-shaped rings move in directions away from or towards each other so as to adjust the diameter of the collector body (2); and a locking mechanism (3) for locking the two arc-shaped rings is connected to the mounting shell (1); Both ends of one of the arc-shaped rings are fixedly connected to a first connection block (211), and both ends of the other arc-shaped ring are fixedly connected to a second connection block (221), one first connection block (211) corresponds to one second connection block (221), and a plurality of protruding teeth are provided on a surface of the first connection block (211) and the second connection block (221) that are close to each other, and the first connection block (211) and the second connection block (221) are meshed with each other; The locking mechanism (3) comprises an annular plate (31) fixedly connected to one end of the mounting housing (1), and also comprises two clamping plates (32), each clamping plate (32) corresponds to a joint of two arc-shaped rings, and the clamping plates (32) and the annular plate (31) clamp the two arc-shaped rings, and each clamping plate (32) is connected to the annular plate (31) via a fastener; A through groove (2112) is provided on a side of the joint of the two arc-shaped rings that faces away from the annular plate (31), and a reinforcing plate (41) is provided on both inner and outer sides of the joint of the two arc-shaped rings. The two reinforcing plates (41) clamp the two arc-shaped rings and a reinforcing spring (42) is fixedly connected between the two reinforcing plates (41). The reinforcing spring (42) is placed in the through groove (2112), and the clamping plate (32) presses against a side of the two reinforcing plates (41) that faces away from the annular plate (31).

2. A fan using a current collector according to claim 1, It is characterized in that The bottom wall of the through groove (2112) is rotatably connected to a rectangular parallelepiped adjustment block (43); when the adjustment block (43) supports the two reinforcement plates (41) along its length direction, the two reinforcement plates (41) are separated from the current collector body (2).

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