A granulation tower fan
By using composite blades and stainless steel protective cover design, combined with multi-leaf dampers and oil and gas pipelines, the problems of high resistance and explosive corrosion of the granulation tower fan are solved, and high-strength, low-cost mechanical power ventilation and safe operation are achieved.
Patent Information
- Application Number
- CN202011316003.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-11-22
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2040-11-22
AI Technical Summary
The existing granulation tower fans have high resistance and high static pressure due to the addition of washing and dust removal equipment inside the system. Traditional metal or fiberglass blade materials cannot meet the high speed requirements, and the corrosion of flammable and explosive gases in the tower requires high protection level of the equipment, which has increased Cost of use and maintenance.
Designed with composite blades and stainless steel protective covers. The blades are made of glass fiber material and multi-layer carbon fiber material. The angle between the tip cross-sectional chord line and the horizontal plane is smaller than the leaf root cross-section. The outside of the motor is sealed with a stainless steel protective cover, and a multi-leaf damper is installed. Oil and gas pipelines, hub design double-plate structure and ring groove structure for enhanced safety and positioning.
It realizes high-strength, corrosion-resistant and low-cost mechanical power ventilation, and the linear speed of the blade tip exceeds 60m/s, which meets the operation under high static pressure conditions, reduces the use and maintenance costs of the fan, and effectively prevents corrosion and gas return.
Smart Images
Figure CN112483442B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a granulation tower fan. Background Art
[0002] The granulation tower is a key process equipment for urea granulation. During the granulation process, the emissions will carry dust and nitrogen substances directly into the atmosphere, causing damage to the surrounding environment. This emission method has been forced to withdraw from the stage of history. Chemical design institutes have digested and absorbed advanced foreign technologies and adopted the washing wet process technology, which not only solved the environmental pollution problem, but also recovered the urea discharged into the atmosphere, reducing the production cost of manufacturers. However, due to the use of washing and dust removal equipment, the resistance drop generated by it greatly exceeds the allowable pressure drop of the natural ventilation granulation tower, so mechanical power can only be used to achieve the purpose of effective ventilation.
[0003] Due to the addition of washing and dust removal equipment inside the system, the system resistance is greatly increased, and the system static pressure reaches 490Pa. In order to overcome the system static pressure, the blade tip linear speed is far more than 60m / s. Traditional fan blade materials are made of metal or fiberglass, which cannot meet the use requirements. At the same time, the environment inside the tower has corrosive and flammable and explosive gases, and the equipment protection level requirements are particularly high, which will greatly increase the fan use cost and maintenance cost. Summary of the invention
[0004] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a granulating tower fan which has high strength, high pressure resistance, strong corrosion resistance, realizes mechanical power ventilation, and has low production and maintenance costs.
[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a granulation tower fan, including a fan casing, a plurality of composite blades, a hub, a rectifier plate, a motor, a stainless steel protective cover and a multi-leaf damper; each blade is mounted on the outer edge of the hub, the output shaft of the motor passes through and is fixed in the inner hole of the hub sleeve, and the motor is fixed in the U-shaped stainless steel protective cover; one end of the cylindrical fan casing is sleeved on the outer ends of the composite blades and the stainless steel protective cover; the other end of the rectifier plate fixed on the outer wall of the stainless steel protective cover is fixed on the inner wall of the fan casing; a multi-leaf damper whose outer wall completely matches the inner wall of the fan casing is fixed in the other end of the fan casing; Two symmetrically distributed oil pipe holes Ⅰ and two symmetrically distributed air outlets Ⅰ are respectively arranged at the two ends, and oil pipe holes Ⅱ and air outlets Ⅱ are opened at corresponding positions of the fan casing; one end of the two air inlet pipes is fixed on the air outlet Ⅰ at one end of the stainless steel protective cover close to the multi-leaf damper, and the other end is fixed in series and in parallel on the corresponding air outlet Ⅱ of the fan casing; one end of the two air outlet pipes is fixed on the air outlet Ⅰ at one end of the stainless steel protective cover close to the blade, and the other end is fixed in series and in parallel on the corresponding air outlet Ⅱ of the fan casing; two oil inlet pipes are installed on the same side of the four corresponding oil pipe holes of the stainless steel protective cover and the fan casing, and two oil outlet pipes are installed on the other side; the two oil inlet and outlet pipes provide oil supply and return for the motor.
[0006] Further preferably, the composite blade includes a blade root and a blade body; the blade root and the blade body are both made of an inner layer of glass fiber material and an outer layer of multi-layer carbon fiber material, and are composed of an integral disc-shaped flange, an intermediate cylinder and a transition cone extending into the root of the blade body; the blade body section is a NACA airfoil section, which is integrally formed with the transition cone of the blade root; the angle between the chord line of the blade tip section and the horizontal plane is smaller than the angle between the chord line of the blade root section and the horizontal plane, the chord length of the chord line of the blade tip section is smaller than the chord length of the chord line of the blade root section, and each section has a smooth transition.
[0007] Further preferably, the wheel hub comprises disc-shaped upper and lower support plates; the shaft sleeve is fixed in the center holes of the upper and lower support plates; annular grooves are correspondingly arranged on the outer edges of the opposite surfaces of the upper and lower support plates, and the upper and lower half clamps with the same number of blades as the number of blades that can form the entire clamp are correspondingly fixed in the upper and lower annular grooves; semi-conical grooves are arranged on the opposite surfaces of the upper and lower clamps; the inner circles of the upper and lower semi-conical sleeves whose outer circles match the semi-conical grooves of the upper and lower half clamps match the middle cylinder of the blade root; the upper and lower semi-conical sleeves are respectively clamped in the semi-conical grooves of the upper and lower half clamps, and the middle cylinder of the blade root is clamped in the semi-conical grooves on the opposite surfaces of the upper and lower half clamps; the upper and lower half clamps are fixed in the relative annular grooves of the upper and lower support plates and the upper and lower half clamps by bolts and locking nuts fixed in the through holes opened in the upper and lower support plates and the upper and lower half clamps.
[0008] Further preferably, the inner circles of the upper and lower semi-conical sleeves are micro-conical surfaces that match the middle cylinder of the blade root. The upper and lower semi-conical sleeves with micro-conical surfaces can better resist the centrifugal force generated by the rotation of the blades, avoid the blades from being separated from the hub due to high-speed rotation, and avoid damage to the fan due to loose bolts, thereby further improving the safety factor.
[0009] Compared with the prior art, the advantages of the present invention are: (1) The outside of the motor is completely sealed with a stainless steel protective cover and is not in contact with corrosive gases, which can effectively prevent the problem of rapid damage to the motor due to corrosion caused by corrosive gases during operation; and two air inlets and two air outlets are set on the stainless steel protective cover to introduce external cooling air and remove internal hot air, effectively ensuring the normal operation of the motor. There are two oil inlet and outlet pipes to provide oil supply and oil return for the motor separately to meet the oil supply needs of the sealed motor. (2) A multi-leaf damper is set at the inlet of the granulation tower fan, so that when the granulation tower fan is working normally, the damper is open and the fan is ventilated normally. When it is shut down for maintenance, the damper is closed to isolate the harmful gas from the human body and prevent the backflow of air flow. (3) The blades are made of composite materials, which have high strength, strong pressure bearing capacity and strong corrosion resistance. In particular, the blades with an inner layer of glass fiber material and an outer layer of multiple layers of carbon fiber material have better strength and corrosion resistance. While improving the performance of the blades, the use range of the blade tip linear velocity is greatly improved; and the transition cone of the blade body and the blade root is integrally formed, which not only increases the strength of the blade, but also prevents damage to the blade due to sudden changes in stiffness; all of these make the overall blade withstand high static pressure and not easily damaged during high-speed rotation, fully meeting the system static pressure of 490Pa and the blade tip linear velocity far exceeding 60m / s. (4) The hub adopts a double-plate structure, and a ring groove structure is designed on the upper and lower support plates of the hub, which can both position and enhance the safety protection effect, playing a double insurance role for the operation of the fan. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of the present invention;
[0011] Figure 2 It is a schematic diagram of the three-dimensional structure of the blade in the present invention;
[0012] Figure 3 It is a schematic diagram of the three-dimensional structure of the wheel hub in the present invention;
[0013] Figure 4 It is a schematic diagram of the assembly structure of the blades and the hub in the present invention. DETAILED DESCRIPTION
[0014] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.
[0015] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment includes a fan casing 5, a plurality of composite blades 8, a hub 9, a rectifier plate 6, a motor 1, a stainless steel protective cover 2 and a multi-leaf damper 11. Each blade 8 is mounted on the outer edge of the hub 9, and the output shaft of the motor 1 is passed through and fixed in the inner hole of the shaft sleeve of the hub 9. The motor 1 is a vertical motor, which is fixed in the U-shaped stainless steel protective cover 2 through the motor flange hole 12 and the protective cover flanging plate. One end of the cylindrical fan casing 5 is sleeved on the outer ends of the composite blades 8 and the stainless steel protective cover 2. The other end of the rectifier plate 6 fixed on the outer wall of the stainless steel protective cover 2 is fixed on the inner wall of the fan casing 5. A multi-leaf damper 11 whose outer wall is completely matched with the inner wall of the fan casing is fixed in the other end of the fan casing 5. Two symmetrically distributed oil pipe through holes I and two symmetrically distributed air outlets I are respectively provided at both ends of the stainless steel protective cover 2, and oil pipe through holes II and air outlets II are opened at corresponding positions of the fan casing 5. One end of the two air inlet pipes 3 is fixed to the air port I at one end of the stainless steel protective cover 2 near the multi-leaf damper, and the other end is fixed in series and parallel to the corresponding air port II of the fan housing 5. One end of the two air outlet pipes 7 is fixed to the air port I at one end of the stainless steel protective cover 2 near the blade, and the other end is fixed in series and parallel to the corresponding air port II of the fan housing 5. Two oil inlet pipes 41 and 42 are installed on the same side of the four oil pipe holes corresponding to the stainless steel protective cover 2 and the fan housing 5, and two oil outlet pipes 101 and 102 are installed on the other side. The two oil inlet and outlet pipes provide oil supply and oil return for the motor. The oil inlet pipe 42 and the oil outlet pipe 102 near the blade 8 supply and return oil to the upper end bearing of the motor 1, and the oil inlet pipe 41 and the oil outlet pipe 101 at the other end supply and return oil to the lower end of the motor 1.
[0016] Preferably, the composite blade 8 includes a blade root and a blade body 84. The blade root and the blade body 84 are both made of an inner layer of glass fiber material and an outer layer of multi-layer carbon fiber material, and are composed of an integral disc-shaped flange 81, an intermediate cylinder 82, and a transition cone 83 that extends into the root of the blade body. The blade body section is a NACA airfoil section, which is integrally formed with the transition cone of the blade root. The angle between the chord line of the blade tip section and the horizontal plane is smaller than the angle between the chord line of the blade root section and the horizontal plane, the chord length of the chord line of the blade tip section is smaller than the chord length of the chord line of the blade root section, and each section has a smooth transition.
[0017] Preferably, the hub 9 includes disc-shaped upper and lower support plates 91, 97. The shaft sleeve 93 is fixed in the center hole of the upper and lower support plates 91, 97. Annular grooves 98 are correspondingly arranged on the outer edges of the opposite surfaces of the upper and lower support plates 91, 97, and upper and lower half clamps 92 and 95, which are the same number as the blades and can form the entire clamp, are correspondingly fixed in the upper and lower annular grooves 98. Semi-conical grooves are arranged on the opposite surfaces of the upper and lower half clamps 92 and 95. The inner circles of the upper and lower half cone sleeves 94, 96, whose outer circles match the semi-conical grooves of the upper and lower half clamps, match the middle cylinder 82 of the blade root. The upper and lower half cone sleeves 94, 96 are respectively clamped in the semi-conical grooves of the upper and lower half clamps 92 and 95, and the middle cylinder 82 of the blade root is clamped in the semi-conical grooves on the opposite surfaces of the upper and lower half clamps 92 and 95. The upper and lower half clamps 92 and 95 are fixed in the relative annular grooves 1 of the upper and lower support plates 91 and 97 by bolts and locking nuts fixed in the through holes of the upper and lower support plates 91 and 97 and the upper and lower half clamps 92 and 95. Preferably, the inner circle of the upper and lower half cone sleeves 94 and 96 is a micro-conical surface matching the middle cylinder 82 of the blade root.
[0018] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, technicians familiar with the field can make corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should be regarded as improvements of equivalent technologies and belong to the protection scope of the claims of the present invention.
Claims
1. A granulation tower fan, characterized in that: The invention comprises a fan casing, a plurality of composite blades, a wheel hub, a rectifier plate, a motor, a stainless steel protective cover and a multi-leaf damper; each blade is mounted on the outer edge of the wheel hub, and the output shaft of the motor is passed through and fixed in the inner hole of the shaft sleeve of the wheel hub; the motor is a vertical motor, which is fixed in the U-shaped stainless steel protective cover through the motor flange hole and the protective cover flanging plate; one end of the cylindrical fan casing is sleeved on the outer ends of the composite blades and the stainless steel protective cover; the other end of the rectifier plate fixed on the outer wall of the stainless steel protective cover is fixed on the inner wall of the fan casing; a multi-leaf damper whose outer wall completely matches the inner wall of the fan casing is fixed in the other end of the fan casing; and a plurality of dampers whose outer wall completely matches the inner wall of the fan casing are provided at both ends of the stainless steel protective cover. Two symmetrically distributed oil pipe holes Ⅰ and two symmetrically distributed air outlets Ⅰ are separately provided, and oil pipe holes Ⅱ and air outlets Ⅱ are opened at corresponding positions of the fan casing; one end of the two air inlet pipes is fixed on the air outlet Ⅰ at one end of the stainless steel protective cover close to the multi-leaf damper, and the other end is passed through and fixed on the corresponding air outlet Ⅱ of the fan casing; one end of the two air outlet pipes is fixed on the air outlet Ⅰ at one end of the stainless steel protective cover close to the blade, and the other end is passed through and fixed on the corresponding air outlet Ⅱ of the fan casing; two oil inlet pipes are installed on the same side of the four oil pipe holes corresponding to the stainless steel protective cover and the fan casing, and two oil outlet pipes are installed on the other side; the two oil inlet and outlet pipes provide oil supply and oil return for the motor; The composite blade comprises a blade root and a blade body; the blade root and the blade body are both made of an inner layer of glass fiber material and an outer layer of multi-layer carbon fiber material, and are composed of an integrated disc-shaped flange, an intermediate cylinder and a transition cone extending into the root of the blade body; the blade body section is a NACA airfoil section, and is integrally formed with the transition cone of the blade root; the angle between the chord line of the blade tip section and the horizontal plane is smaller than the angle between the chord line of the blade root section and the horizontal plane, the chord length of the chord line of the blade tip section is smaller than the chord length of the chord line of the blade root section, and each section has a smooth transition; The hub comprises a disc-shaped upper and lower support plates; the shaft sleeve is fixed in the center holes of the upper and lower support plates; annular grooves are correspondingly arranged on the outer edges of the opposite surfaces of the upper and lower support plates, and upper and lower half clamps with the same number as the blades that can form the entire clamp are correspondingly fixed in the upper and lower annular grooves; semi-conical grooves are arranged on the opposite surfaces of the upper and lower half clamps; the inner circles of the upper and lower half conical sleeves whose outer circles match the semi-conical grooves of the upper and lower half clamps match the middle cylinder of the blade root; The upper and lower cone sleeves are respectively clamped in the semi-conical grooves of the upper and lower clamps, and the middle cylinder of the blade root is clamped in the semi-conical grooves on the opposite surfaces of the upper and lower clamps; the upper and lower clamps are fixed in the relative annular grooves of the upper and lower support plates by bolts and locking nuts fixed in the through holes of the upper and lower support plates and the upper and lower clamps.
2. The granulation tower fan according to claim 1, characterized in that: The inner circles of the upper and lower semi-conical sleeves are micro-conical surfaces that match the middle cylinder of the blade root.