Single-air-inlet double-support centrifugal fan with large and small bearings

Abstract

The single-air-inlet double-support centrifugal ventilator comprises a machine shell and a thrust end bearing, the front end, located on one side of an air inlet box, of the machine shell is provided with a support end bearing, and the thrust end bearing is arranged at the rear end, close to one side of an impeller, of the machine shell; the thrust end bearings are larger than the supporting end bearings in size, and the thrust end bearings are embedded into the two ends of the bearing box. In the using process, due to the existence of the air inlet box, the position of the supporting end bearing is far away from the impeller, so that the supporting end bearing only bears a small part of fan operation loads, due to the fact that the thrust end bearing is close to the impeller, the thrust end bearing bears a large part of fan operation loads, and based on the structural characteristics, the thrust end bearing close to the impeller can be a large bearing; the supporting end bearing far away from the impeller is a small bearing, the bearing is small, and the corresponding shaft and the bearing box can be reduced, so that the impeller has the advantage that the cost of the bearing, the shaft and the bearing box is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fans, in particular to a single-intake double-support centrifugal fan with large and small bearings. Background Art

[0002] A fan is a machine used to compress and transport gas. From an energy point of view, it is a machine that converts the mechanical energy of the prime mover into gas energy. Centrifugal fans are mainly composed of air inlet, impeller, volute and other main components. The centrifugal force generated by the rotation of the impeller enables the medium to gain energy, and then part of the kinetic energy is converted into static pressure through the volute and the volute outlet diffuser.

[0003] At present, most domestic manufacturers produce single-inlet double-support centrifugal fans. The support end bearing and the thrust end bearing are the same size. But in fact, the core component of the single-inlet double-support centrifugal fan, the impeller, is close to the thrust end bearing. The thrust end bearing carries most of the rotor load, and the support end bearing only carries a small part of the rotor load. If the support end uses the same size bearing as the thrust end, the cost will increase, especially the price of imported bearings is several times that of domestic bearings. In addition, the existing water-cooled oil-immersed fan bearing box is easy to cause the bearing box to be damaged when it is in an external heat working condition. Scrapped, centrifugal fans in external heat conditions, the impeller is always exhausting or drawing in hot air, so the impeller and the shaft disk connected to the impeller heat up first, and then the shaft disk transfers the heat to the main shaft of the bearing box, the main shaft heats up and transfers the heat to the bearings, the bearings heat up and transfer the heat to the lubricating oil to heat it up. When the temperature rises to a certain limit, the expansion of the bearing balls directly reduces the gap between the balls and the spring grooves, and the lubricating oil loses its viscosity due to excessive temperature and cannot play a lubricating role, which eventually leads to the bearing balls and spring grooves being stuck, making the bearings a vulnerable part with more failures.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a single-intake double-support centrifugal fan with large and small bearings is proposed. Summary of the invention

[0005] The object of the present invention is to provide a single-intake double-support centrifugal fan with large and small bearings to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a single-intake double-support centrifugal fan with large and small bearings, comprising a casing and a thrust end bearing, wherein the casing is provided with a support end bearing at the front end of the air inlet box, and the thrust end bearing is provided at the rear end of the casing close to the impeller side, and the thrust end bearing is larger in size than the support end bearing, and the thrust end bearing is embedded at both ends of the bearing box, an oil chamber is opened inside the bearing box, and a water-cooled plate with an arc structure is transitionally connected at the bottom end of the oil chamber, and a heat exchange coil spirally arranged in an "S" shape is embedded inside the water-cooled plate, a main shaft is rotatably installed between the thrust end bearings on both sides, and the lower half of the main shaft is always immersed in the lubricating oil in the oil chamber, and a cooling fan is coaxially fixed to the pulley end of the main shaft.

[0007] Furthermore, a circulation pumping assembly is provided in the upper half of the oil chamber, and the circulation pumping assembly includes a gear ring and a gear. The gear ring is coaxially fixed to the middle of the main shaft, and the upper end of the gear ring is meshed with a gear.

[0008] Furthermore, the circulation pumping assembly also includes a mounting plate, the back side of the gear is rotatably matched with the mounting plate, and the mounting plate is fixed to the inner wall of the top end of the oil chamber.

[0009] Furthermore, the circulation pumping assembly also includes an eccentric connecting rod and a piston rod. The front side of the gear is rotatably connected to the eccentric connecting rod, and the end of the eccentric connecting rod that is away from the eccentric column convex of the gear is rotatably connected to the piston rod.

[0010] Furthermore, the circulating pumping assembly also includes a pump cylinder, a one-way water outlet pipe and a one-way water return pipe. The piston rod is slidably installed inside the pump cylinder, and the pump cylinder is embedded in the upper end of the bearing box. The side of the pump cylinder close to the main shaft impeller end is connected to the one-way water outlet pipe, and the side of the pump cylinder close to the main shaft pulley end is connected to the one-way water return pipe.

[0011] Furthermore, a partitioned cooling assembly adjacent to the main shaft impeller end is provided at the front end of the bearing box, and the partitioned cooling assembly includes a front side cover, a front shaft hole and a drain port. A front shaft hole is opened through the middle of the front side cover, and the bottom end of the inner cavity of the front side cover is connected to a drain port, and the drain port is connected to the inlet end of the heat exchange coil inside the water cooling plate.

[0012] Furthermore, the partitioned cooling assembly also includes a flow tube, an outer ring cooling water channel and an inner ring cooling water channel. The flow tube is spirally arranged inside the front side cover, and the outer ring part of the flow tube is provided with an outer ring cooling water channel corresponding to the outer ring of the thrust end bearing, and the inner ring part of the flow tube is provided with an inner ring cooling water channel corresponding to the inner ring of the thrust end bearing.

[0013] Furthermore, the partitioned cooling assembly also includes an arc-shaped cavity and drip holes, the two ends of the inner ring cooling water channel converge inside the arc-shaped cavity, and drip holes are evenly spaced at the bottom of the arc-shaped cavity, and the drip holes are located above the main shaft and parallel to its axis.

[0014] Furthermore, the rear end of the bearing box is provided with an air cooling component adjacent to the main shaft pulley end, and the air cooling component includes a rear side cover, a rear axle hole and a cooling water interface. The rear side cover is provided with a rear axle hole through the middle part, and the upper and lower ends of the rear side cover are respectively connected with cooling water interfaces, the cooling water interface at the lower end is connected to the outlet end of the heat exchange coil inside the water cooling plate, and the cooling water interface at the upper end is connected to the pump cylinder through a one-way return pipe.

[0015] Furthermore, the air-cooling component also includes a cooling coil, and the rear cover is embedded with a cooling coil that is spirally arranged in an "S" shape, and the spiral path of the cooling coil avoids the opening position of the rear axle hole, and the cooling coil cooperates with the cooling fan at the rear end of the main shaft to dissipate heat.

[0016] The present invention provides a single-intake double-support centrifugal fan with large and small bearings, which has the following beneficial effects:

[0017] 1. During the use of the present invention, a gear ring is coaxially installed on the middle part of the main shaft located in the bearing box. When the main shaft rotates, the gear ring is meshed with the gear located in the upper half of the oil chamber to drive the piston rod in the pump cylinder to make reciprocating motion through the eccentric connecting rod, so that the cooling water circulates inside the bearing box. The present invention does not need to add an additional circulation pump outside the bearing box to realize the circulation of cooling water through the setting of the circulation pumping component. Instead, the cooling water is driven to circulate in the bearing box by the rotation of the main shaft itself, which greatly reduces the production cost. At the same time, the heat of the thrust end bearing, the main shaft and the lubricating oil in the oil chamber is taken away by the circulation of the cooling water in the bearing box, so as to achieve an efficient cooling effect.

[0018] 2. During the use of the present invention, when the cooling water is located in the zoned flow process of the flow channel pipe, the outer ring and the inner ring of the thrust end bearing at the impeller end of the main shaft are cooled in zones, and finally fall from the drip hole at the bottom end of the arc-shaped cavity, and spray onto the impeller end of the main shaft to take away the heat, thereby reducing the heat conduction of the main shaft to the thrust end bearing close to the impeller side. The warm water flows into the cavity under the front cover along the outer edge of the main shaft and then flows out from the drain port, and flows radially through the water cooling plate at the bottom of the oil cavity to achieve heat exchange cooling of the lubricating oil. Based on the radial water cooling cycle and axial water cooling of the lubricating oil in the prior art, the present application, on the one hand, curbs the temperature rise of the inner ring of the thrust end bearing caused by the heat conduction of the main shaft by spray cooling of the main shaft, and plays a water shielding role of isolating the heat source of the shaft end to a certain extent. On the other hand, by zoned cooling of the inner and outer rings of the thrust end bearing, the limitation of the prior art that only the outer ring of the thrust end bearing is cooled is solved, the uniformity of the overall cooling of the thrust end bearing is improved, and the service life of the thrust end bearing is extended.

[0019] 3. During the use of the present invention, a wind wheel cooling component is provided at the main shaft pulley end. The heat dissipation fan can not only cool the thrust end bearing at the main shaft pulley end through the air holes provided on the rear cover, but also utilize the characteristic that the thrust end bearing at the main shaft pulley end does not generate much heat, and select this location to perform heat exchange and cooling of the cooling water, so that the cooling water entering the next cycle is fully cooled. While the circulating pumping component realizes the circulating pumping of the cooling water in the bearing box, the heat exchange and cooling of the cooling water are also performed to maintain the efficient heat exchange effect of the cooling water, and the high use cost caused by the use of an external chiller for cooling is also eliminated;

[0020] 4. During the use of the present invention, the support end bearing of the present application is located far away from the impeller due to the existence of the air intake box, so it will only bear a small part of the load of the fan operation. The thrust end bearing is close to the impeller and bears most of the load of the fan operation. Based on this structural feature, a larger bearing can be used for the thrust end bearing close to the impeller, and a smaller bearing can be used for the support end bearing farther from the impeller. The smaller the bearing, the smaller the corresponding shaft and bearing box, which makes the present application have the advantage of greatly reducing the cost of bearings, shafts and bearing boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the bearing box of the present invention;

[0023] Figure 3 It is a cross-sectional structural schematic diagram of the bearing box of the present invention;

[0024] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0025] Figure 5 This is a schematic diagram of the structure of the partition cooling assembly of the present invention;

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the water cooling plate of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the air cooling component of the present invention.

[0028] In the figure: 1, housing; 2, support end bearing; 3, thrust end bearing; 4, bearing box; 5, oil chamber; 6, water cooling plate; 7, heat exchange coil; 8, main shaft; 9, cooling fan; 10, circulation pumping assembly; 1001, gear ring; 1002, gear; 1003, mounting plate; 1004, eccentric connecting rod; 1005, piston rod; 1006, pump cylinder; 1007, one-way water outlet pipe; 1008, one-way Return pipe; 11. Partition cooling assembly; 1101. Front side cover; 1102. Front axle hole; 1103. Drain port; 1104. Flow pipe; 1105. Outer ring cooling water channel; 1106. Inner ring cooling water channel; 1107. Arc cavity; 1108. Drip hole; 12. Air-cooled cooling assembly; 1201. Rear side cover; 1202. Rear axle hole; 1203. Cooling water interface; 1204. Cooling coil. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] See also Figure 1 to Figure 2 The present invention provides a technical solution: a single-intake double-support centrifugal fan with large and small bearings, comprising a casing 1 and a thrust end bearing 3, wherein the casing 1 is provided with a support end bearing 2 at the front end on one side of the air inlet box, and the thrust end bearing 3 is provided at the rear end of the casing 1 close to the impeller side, and the thrust end bearing 3 is larger than the support end bearing 2, and the thrust end bearing 3 is embedded at both ends of a bearing box 4, an oil cavity 5 is provided inside the bearing box 4, and a water cooling plate 6 with an arc structure is transitionally connected at the bottom end of the oil cavity 5, and a heat exchange coil 7 spirally arranged in an "S" shape is embedded inside the water cooling plate 6, a main shaft 8 is rotatably installed between the thrust end bearings 3 on both sides, and the lower half of the main shaft 8 is always immersed in the lubricating oil in the oil cavity 5, and a cooling fan 9 is coaxially fixed to the pulley end of the main shaft 8;

[0031] The specific operation is as follows: the support end bearing 2 of the present application is far away from the impeller due to the existence of the air intake box, so it will only bear a small part of the load of the fan operation; the thrust end bearing 3 is close to the impeller, and it bears most of the load of the fan operation. Based on this structural feature, the thrust end bearing 3 close to the impeller can be a larger bearing, and the support end bearing 2 far from the impeller can be a smaller bearing. The smaller the bearing, the smaller the corresponding shaft and the bearing box 4, so that the present application has the advantage of greatly reducing the cost of the bearing, shaft and bearing box 4;

[0032] See also Figure 3 to Figure 4 The upper part of the oil chamber 5 is provided with a circulating pumping assembly 10, which includes a gear ring 1001 and a gear 1002. The gear ring 1001 is coaxially fixed to the middle of the main shaft 8, and the upper end of the gear ring 1001 is meshed with the gear 1002. The circulating pumping assembly 10 also includes a mounting plate 1003. The back of the gear 1002 is rotatably matched with the mounting plate 1003, and the mounting plate 1003 is fixed to the inner wall of the top of the oil chamber 5. The circulating pumping assembly 10 also includes an eccentric connecting rod 1004 and a piston rod 1005. The front of the gear 1002 is rotatably connected with the eccentric connecting rod 1004. The eccentric connecting rod 1004 is rotatably connected to the piston rod 1005 at one end of the eccentric connecting rod 1004 away from the eccentric column convex of the gear 1002. The circulating pumping assembly 10 also includes a pump cylinder 1006, a one-way water outlet pipe 1007 and a one-way water return pipe 1008. The piston rod 1005 is slidably installed inside the pump cylinder 1006, and the pump cylinder 1006 is embedded in the upper end of the bearing box 4. The side of the pump cylinder 1006 close to the impeller end of the main shaft 8 is connected to the one-way water outlet pipe 1007, and the side of the pump cylinder 1006 close to the pulley end of the main shaft 8 is connected to the one-way water return pipe 1008;

[0033] The specific operation is as follows: the thrust end bearing 3 needs to bear a large operating load. Since it is close to the impeller, the impeller will transfer heat to the bearing box 4 where the thrust end bearing 3 is located through the main shaft 8, causing the lubricating oil to heat up and fail, thereby causing the thrust end bearing 3 to be damaged and scrapped. In this application, a gear ring 1001 is coaxially installed on the middle part of the main shaft 8 located in the bearing box 4. When the main shaft 8 rotates, the gear ring 1001 is meshed with the gear 1002 located in the upper half of the oil chamber 5, and then the eccentric connecting rod 1004 is used to transmit the gear. The piston rod 1005 is driven to make reciprocating motion in the pump cylinder 1006, so that the cooling water circulates inside the bearing box 4. The present application, through the setting of the circulating pumping assembly 10, does not need to add an additional circulating pump outside the bearing box 4 to realize the circulating flow of the cooling water. Instead, the cooling water is driven to circulate in the bearing box 4 synchronously with the help of the rotation of the main shaft 8 itself, which greatly reduces the production cost. At the same time, the heat of the thrust end bearing 3, the main shaft 8 and the lubricating oil in the oil chamber 5 is taken away by the circulating flow of the cooling water in the bearing box 4, so as to achieve an efficient cooling effect.

[0034] See also Figures 5 and 6 The front end of the bearing box 4 is provided with a partition cooling assembly 11 adjacent to the impeller end of the main shaft 8. The partition cooling assembly 11 includes a front side cover 1101, a front shaft hole 1102 and a drain port 1103. The front shaft hole 1102 is opened through the middle of the front side cover 1101, and the bottom end of the inner cavity of the front side cover 1101 is connected with the drain port 1103, and the drain port 1103 is connected with the inlet end of the heat exchange coil 7 inside the water cooling plate 6. The partition cooling assembly 11 also includes a flow channel pipe 1104, an outer ring cooling water channel 1105 and an inner ring cooling water channel 1106. The inner part of the front side cover 1101 is spirally connected. A flow channel pipe 1104 is provided, and an outer ring portion of the flow channel pipe 1104 is provided with an outer ring cooling water channel 1105 corresponding to the outer ring of the thrust end bearing 3, and an inner ring portion of the flow channel pipe 1104 is provided with an inner ring cooling water channel 1106 corresponding to the inner ring of the thrust end bearing 3, the partition cooling assembly 11 also includes an arc-shaped cavity 1107 and a drip hole 1108, both ends of the inner ring cooling water channel 1106 merge into the interior of the arc-shaped cavity 1107, and the bottom end of the arc-shaped cavity 1107 is provided with drip holes 1108 at equal intervals, and the drip holes 1108 are located above the main shaft 8 and parallel to its axis;

[0035] The specific operation is as follows: the cooling water pumped in the pump cylinder 1006 enters the partition cooling assembly 11 set at the impeller end of the main shaft 8 through the one-way water outlet pipe 1007, and the cooling water flows through the outer ring cooling water channel 1105 and the inner ring cooling water channel 1106 in turn and then merges into the arc cavity 1107. During the partition flow process of the cooling water in the flow channel pipe 1104, the outer ring and the inner ring of the thrust end bearing 3 at the impeller end of the main shaft 8 are cooled in a partitioned manner, and finally fall from the drip hole 1108 at the bottom end of the arc cavity 1107, and sprinkle on the impeller end of the main shaft 8 to take away the heat, thereby reducing the heat conduction of the main shaft 8 to the thrust end bearing 3 close to the impeller side, and the warm water flows along the outer edge of the main shaft 8 into the front side cover 1 101 and then flows out from the drain port 1103, and flows radially through the water cooling plate 6 at the bottom of the oil chamber 5, so as to realize heat exchange cooling of the lubricating oil. Based on the prior art of radial water cooling cycle and axial water cooling of the lubricating oil, the present application, on the one hand, curbs the temperature rise of the inner ring of the thrust end bearing 3 caused by the heat conduction of the main shaft 8 by spray cooling the main shaft 8, and plays a water shielding role of isolating the heat source of the shaft end to a certain extent; on the other hand, by partitioning the inner and outer rings of the thrust end bearing 3, the limitation of the prior art of only cooling the outer ring of the thrust end bearing 3 is solved, the uniformity of the overall cooling of the thrust end bearing 3 is improved, and the service life of the thrust end bearing 3 is extended;

[0036] See also Figure 7, a wind-cooling and cooling component 12 adjacent to the pulley end of the main shaft 8 is provided at the rear end of the bearing box 4, the wind-cooling and cooling component 12 includes a rear side cover 1201, a rear axle hole 1202 and a cooling water interface 1203, a rear axle hole 1202 is opened through the middle of the rear side cover 1201, and the upper and lower ends of the rear side cover 1201 are respectively connected with cooling water interfaces 1203, the cooling water interface 1203 at the lower end is connected with the outlet end of the heat exchange coil 7 inside the water-cooled plate 6, and the cooling water interface 1203 at the upper end is connected with the pump cylinder 1006 through a one-way return water pipe 1008, the wind-cooling and cooling component 12 also includes a cooling coil 1204, a cooling coil 1204 spirally arranged in an "S"-shaped structure is embedded in the rear side cover 1201, and the spiral path of the cooling coil 1204 avoids the opening position of the rear axle hole 1202, and the cooling coil 1204 cooperates with the heat dissipation fan 9 at the rear end of the main shaft 8 to dissipate heat;

[0037] The specific operation is as follows: the present application sets a wind wheel cooling component at the pulley end of the main shaft 8. Since the thrust end bearing 3 there is far away from the impeller and the heat conducted by the main shaft 8 is shielded by the water of the partition cooling component 11, the warm water flows in the cooling coil 1204 and cooperates with the heat dissipation fan 9 coaxial with the rear end of the main shaft 8 to achieve cooling. The cooled cooling water flows back to the pump cylinder 1006 through the one-way return pipe 1008 to enter the next cycle. The setting of the heat dissipation fan 9 can not only be achieved through the setting on the rear cover 1201, but also can be used for cooling the heat dissipation fan 9. The air hole is used to blow air to cool the thrust end bearing 3 at the pulley end of the main shaft 8. In addition, by utilizing the fact that the thrust end bearing 3 at the pulley end of the main shaft 8 does not generate much heat, this position is selected to perform heat exchange and cooling of the cooling water, so that the cooling water entering the next cycle can be fully cooled. While the circulating pumping component 10 realizes the circulating pumping of the cooling water in the bearing box 4, the heat exchange and cooling of the cooling water are also performed to maintain the efficient heat exchange effect of the cooling water, and the high use cost of using an external chiller for cooling is also eliminated.

[0038] In summary, when using a single-intake double-support centrifugal fan with the same size bearings, the support end bearing 2 of the present application is located far away from the impeller due to the presence of the air intake box, so it will only bear a small part of the load of the fan operation. The thrust end bearing 3 is close to the impeller, so it bears most of the load of the fan operation. Based on this structural feature, the thrust end bearing 3 close to the impeller can be a larger bearing, and the support end bearing 2 far from the impeller can be a smaller bearing. The smaller the bearing, the smaller the corresponding shaft and bearing box 4 can also be, so that the present application has the advantage of greatly reducing the cost of bearings, shafts and bearing box 4. In addition to bearing a larger operating load, the thrust end bearing 3 is close to the impeller, so the impeller will transfer heat to the bearing box 4 where the thrust end bearing 3 is located through the main shaft 8. The lubricating oil that plays a lubricating role will heat up and become ineffective, thereby causing the thrust end bearing 3 to be damaged and scrapped. The present application installs a gear ring 1001 coaxially on the middle part of the main shaft 8 located in the bearing box 4. When the main shaft 8 rotates, the gear ring 1001 is meshed with the gear 1002 located in the upper half of the oil chamber 5 for transmission, and then the eccentric connecting rod 1004 drives the piston rod 1005 in the pump cylinder 1006 to make reciprocating motion, so that the cooling water is located in the bearing box 4. The present application arranges a circulating pumping component 10, and there is no need to add an additional circulating pump outside the bearing box 4 to realize the circulating flow of cooling water. Instead, the cooling water is synchronously driven to circulate in the bearing box 4 by the rotation of the main shaft 8 itself, which greatly reduces the production cost while reducing the cooling water level. The circulating flow in the bearing box 4 takes away the heat of the thrust end bearing 3, the main shaft 8 and the lubricating oil in the oil chamber 5, achieving an efficient cooling effect. The cooling water pumped in the pump cylinder 1006 enters the partition cooling component 11 set at the impeller end of the main shaft 8 through the one-way water outlet pipe 1007. The cooling water flows through the outer ring cooling water channel 1105 and the inner ring cooling water channel 1106 in turn and then merges into the arc cavity 1107. During the partition flow of the cooling water in the flow channel pipe 1104, the outer ring and the inner ring of the thrust end bearing 3 at the impeller end of the main shaft 8 are cooled in partitions, and finally fall from the drip hole 1108 at the bottom of the arc cavity 1107, and sprinkle on the impeller end of the main shaft 8 to take away the heat, thereby reducing the heat conduction of the main shaft 8 to the thrust end bearing 3 close to the impeller side. The outer edge of the shaft 8 flows into the lower cavity of the front side cover 1101 and then flows out from the drain port 1103, and flows radially through the water cooling plate 6 at the bottom of the oil cavity 5 to achieve heat exchange cooling of the lubricating oil. Based on the prior art of radial water cooling circulation and axial water cooling of the lubricating oil, the present application, on the one hand, curbs the temperature rise of the inner ring of the thrust end bearing 3 caused by the heat conduction of the main shaft 8 by spray cooling the main shaft 8, and to a certain extent plays a water shielding role of isolating the heat source of the shaft end. On the other hand, by partitioning the inner and outer rings of the thrust end bearing 3, the limitation of the prior art that only the outer ring of the thrust end bearing 3 is cooled is solved, the uniformity of the overall cooling of the thrust end bearing 3 is improved, and the service life of the thrust end bearing 3 is extended. The present application is provided with a wind wheel cooling component at the pulley end of the main shaft 8.Since the thrust end bearing 3 at this location is far away from the impeller and the heat conducted by the main shaft 8 is shielded by the water of the partition cooling component 11, the warm water is located in the cooling coil 1204 and cooperates with the heat dissipation fan 9 coaxial with the rear end of the main shaft 8 to achieve cooling. The cooled cooling water flows back to the pump cylinder 1006 through the one-way return pipe 1008 to enter the next cycle. The setting of the heat dissipation fan 9 can not only blow air to cool the thrust end bearing 3 at the pulley end of the main shaft 8 through the air holes set on the rear cover 1201, but also use the characteristic that the thrust end bearing 3 at the pulley end of the main shaft 8 does not generate much heat to select this location to perform heat exchange and cooling of the cooling water, so that the cooling water entering the next cycle is fully cooled. While the circulating pumping component 10 realizes the circulating pumping of the cooling water in the bearing box 4, it also maintains the efficient heat exchange effect of the cooling water by heat exchange and cooling of the cooling water, and also saves the high cost of using an external chiller for cooling.

[0039] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various implementations with various modifications suitable for specific uses.

Claims

1. A single-intake double-support centrifugal fan with large and small bearings, characterized in that: The invention comprises a casing (1) and a thrust end bearing (3), wherein the casing (1) is provided with a support end bearing (2) at the front end of the air intake box, the thrust end bearing (3) is provided at the rear end of the casing (1) close to the impeller, and the thrust end bearing (3) is larger than the support end bearing (2), and the thrust end bearing (3) is embedded at both ends of a bearing box (4), an oil chamber (5) is provided inside the bearing box (4), and a water cooling plate (6) with an arc structure is transitionally connected to the bottom end of the oil chamber (5), and a heat exchange coil (7) with an "S"-shaped structure is embedded inside the water cooling plate (6), a main shaft (8) is rotatably installed between the thrust end bearings (3) on both sides, and the lower half of the main shaft (8) is always immersed in the lubricating oil in the oil chamber (5), and a heat dissipation fan (9) is coaxially fixed to the pulley end of the main shaft (8).

2. A single-intake double-support centrifugal fan with large and small bearings according to claim 1, characterized in that: The upper half of the oil chamber (5) is provided with a circulation pumping assembly (10), the circulation pumping assembly (10) comprising a gear ring (1001) and a gear (1002), the gear ring (1001) being coaxially fixed to the middle of the main shaft (8), and the upper end of the gear ring (1001) being meshed with the gear (1002).

3. A single-intake double-support centrifugal fan with large and small bearings according to claim 2, characterized in that: The circulating pumping assembly (10) further comprises a mounting plate (1003), the back side of the gear (1002) is rotatably matched with the mounting plate (1003), and the mounting plate (1003) is fixed to the inner wall of the top end of the oil chamber (5).

4. A single-intake double-support centrifugal fan with large and small bearings according to claim 3, characterized in that: The circulation pumping assembly (10) further comprises an eccentric connecting rod (1004) and a piston rod (1005); the front side of the gear (1002) is rotatably connected to the eccentric connecting rod (1004); and the end of the eccentric connecting rod (1004) which is away from the eccentric column of the gear (1002) is rotatably connected to the piston rod (1005).

5. A single-intake double-support centrifugal fan with large and small bearings according to claim 4, characterized in that: The circulation pumping assembly (10) further comprises a pump cylinder (1006), a one-way water outlet pipe (1007) and a one-way water return pipe (1008); the piston rod (1005) is slidably mounted inside the pump cylinder (1006), and the pump cylinder (1006) is embedded in the upper end of the bearing box (4); the side of the pump cylinder (1006) close to the impeller end of the main shaft (8) is connected to the one-way water outlet pipe (1007), and the side of the pump cylinder (1006) close to the pulley end of the main shaft (8) is connected to the one-way water return pipe (1008).

6. A single-intake double-support centrifugal fan with large and small bearings according to claim 1, characterized in that: The front end of the bearing box (4) is provided with a partition cooling assembly (11) adjacent to the impeller end of the main shaft (8), and the partition cooling assembly (11) comprises a front side cover (1101), a front shaft hole (1102) and a drain port (1103), the front side cover (1101) having a front shaft hole (1102) extending through the middle thereof, and the bottom end of the inner cavity of the front side cover (1101) is connected to the drain port (1103), and the drain port (1103) is connected to an inlet end of a heat exchange coil (7) inside the water cooling plate (6).

7. A single-intake double-support centrifugal fan with large and small bearings according to claim 6, characterized in that: The partitioned cooling assembly (11) further comprises a flow channel pipe (1104), an outer ring cooling water path (1105) and an inner ring cooling water path (1106); the flow channel pipe (1104) is spirally arranged inside the front cover (1101), and the outer ring portion of the flow channel pipe (1104) is provided with an outer ring cooling water path (1105) corresponding to the outer ring of the thrust end bearing (3), and the inner ring portion of the flow channel pipe (1104) is provided with an inner ring cooling water path (1106) corresponding to the inner ring of the thrust end bearing (3).

8. A single-intake double-support centrifugal fan with large and small bearings according to claim 7, characterized in that: The partitioned cooling assembly (11) further comprises an arc-shaped cavity (1107) and a drip hole (1108), the two ends of the inner ring cooling water channel (1106) converge inside the arc-shaped cavity (1107), and the drip holes (1108) are evenly spaced at the bottom end of the arc-shaped cavity (1107), and the drip holes (1108) are located above the main shaft (8) and parallel to its axis.

9. A single-inlet double-support centrifugal fan with large and small bearings according to claim 8, characterized in that: The rear end of the bearing box (4) is provided with an air cooling component (12) adjacent to the pulley end of the main shaft (8), and the air cooling component (12) comprises a rear side cover (1201), a rear axle hole (1202) and a cooling water interface (1203). The rear side cover (1201) is provided with a rear axle hole (1202) running through the middle, and the upper and lower ends of the rear side cover (1201) are respectively connected with cooling water interfaces (1203), the cooling water interface (1203) at the lower end is connected to the outlet end of the heat exchange coil (7) inside the water cooling plate (6), and the cooling water interface (1203) at the upper end is connected to the pump cylinder (1006) through a one-way return water pipe (1008).

10. A single-intake double-support centrifugal fan with large and small bearings according to claim 9, characterized in that: The air-cooling component (12) also includes a cooling coil (1204), and the rear cover (1201) is internally embedded with a cooling coil (1204) that is spirally arranged in an "S" shape, and the spiral path of the cooling coil (1204) avoids the opening position of the rear axle hole (1202), and the cooling coil (1204) cooperates with the heat dissipation fan (9) at the rear end of the main shaft (8) to dissipate heat.

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