Single-drive series fan

Abstract

The invention discloses a single-drive series fan, which relates to the field of fans, and is characterized in that the single-drive series fan comprises a base, a fan I and a fan II, the base is fixedly connected with a drive motor, an annular cover is fixedly connected between the fan I and the fan II, one side of the fan I is provided with a plurality of vent holes, and the vent holes are communicated with the fan I; the other end of the annular cover communicates with an air inlet of the second fan, and a plurality of air inlets are formed in the peripheral wall of the annular cover. The two draught fans are synchronized through the same driving motor, the first draught fan and the second draught fan form a whole, and therefore the occupied area of the whole draught fan is reduced, in the running process of the first draught fan, part of air in the first draught fan moves in the direction of the ventilation holes under the action of the first impeller, and due to the fact that the air entering from the first draught fan is accelerated by the first impeller, the air in the first draught fan is exhausted. After the air enters the second fan and is accelerated by the second impeller, the flow speed of the air is increased, and therefore the air flowing out of the second fan is stronger.

Description

Technical Field

[0001] The present invention relates to the field of fans, and more particularly to a single-drive series fan. Background Art

[0002] A fan is a mechanical device used to create air or gas flow by moving it from one place to another through rotating blades, thereby changing the speed and direction of the air flow.

[0003] Existing fans are used in many scenarios. For example, in the process of drying textiles, the fabrics usually need to go through the steps of drying or removing moisture. The fans accelerate the air flow to remove moisture from the surface or inside of the textiles. For example, the fan is also the core device that provides airflow power in the dust collection system. It generates airflow to suck dust and particles in the air from the work area or production line and transport them to the dust collection device.

[0004] In the above two scenarios, the wind pressure inside the fan is different. In terms of fabric drying, the wind pressure required by the fan is relatively low, as long as the wind can pass through the fabric. Excessive wind pressure may cause damage to the textile. In terms of dust collection, the fan requires a higher wind pressure in order to inhale particles in the air and transmit them to the dust collector through the pipe system. Therefore, in the textile production plant, two fans are generally used to realize the application of the above two scenarios. By changing the rotation speed of the motor to generate different wind pressures in the fan, the fan can meet the needs of different application scenarios.

[0005] However, to realize the application of the above two scenarios by using two fans that can be controlled independently of each other, sufficient space must be left on the factory floor to place the two fans. The two fans occupy a large area, which is not conducive to the utilization of factory space.

[0006] Therefore, new solutions need to be proposed to solve this problem. Summary of the invention

[0007] In view of the deficiencies in the prior art, an object of the present invention is to provide a single-drive series fan.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions: a single-drive series fan, comprising a base, a fan 1 and a fan 2, the fan 1 and the fan 2 are both centrifugal fans, the fan 1 and the fan 2 are respectively provided with an impeller 1 and an impeller 2, the base is fixedly connected with a driving motor for synchronously driving the impeller 1 and the impeller 2 to rotate, an annular cover is fixedly connected between the fan 1 and the fan 2, a plurality of ventilation holes connected to one end of the annular cover are opened on one side of the fan 1, the other end of the annular cover is connected to the air inlet of the fan 2, a plurality of air inlets are opened on the outer peripheral wall of the annular cover, and the impeller 1 can push part of the air volume in the fan 1 toward the ventilation hole; The impeller 1 includes a mounting plate and an annular plate, a plurality of blades 1 are fixedly connected between the mounting plate and the annular plate, the output shaft of the drive motor is fixedly connected to the mounting plate, the blade 1 includes a centrifugal area and an axial flow area, the area of ​​the centrifugal area is larger than the area of ​​the axial flow area, a plurality of ventilation grooves are opened on the mounting plate, and the ventilation grooves are located at the projection position of the axial flow area on the mounting plate.

[0009] The present invention is further configured as follows: a guide ring is fixedly connected to the inner edge of the annular plate, the diameter of the guide ring decreases as it is farther away from the annular plate, and the axial flow area is a portion of the blade extending to the guide ring.

[0010] The present invention is further configured as follows: all the ventilation holes form a ventilation area on the mounting plate, the ventilation area is annular, and the projection of the ventilation slot on an inner wall of the fan is located on the ventilation area.

[0011] The present invention is further configured as follows: a plurality of balancing blades are fixedly connected to a side of the annular plate facing away from the mounting plate, and the balancing blades can generate a balancing force for the impeller 1 in the direction of the annular cover.

[0012] The present invention is further configured as follows: a plurality of the balancing blades are arranged close to the outer edge of the annular plate, an air guide cover is fixedly connected to the inner edge of the air inlet of the fan one, one end of the air guide cover extends into the fan one and close to the guide ring, the diameter of the air guide cover becomes smaller as it approaches the guide ring, and the minimum diameter of the guide ring is greater than the minimum diameter of the air guide cover.

[0013] The present invention is further configured as follows: a wind collecting hood is fixedly connected in the annular hood, one end of the wind collecting hood is fixedly connected to the air inlet of fan 2, and the other end of the wind collecting hood is fixedly connected to the inner circumferential wall of the annular hood, and all the air inlets are located on the side of the wind collecting hood facing away from fan 2.

[0014] The present invention is further configured as follows: the impeller 2 includes a plurality of blades 2, and the impeller 2 can only generate wind facing away from the center of the fan 2.

[0015] In summary, the present invention has the following beneficial effects: Impeller 1 and impeller 2 are synchronously driven to rotate by the same driving motor, so that fan 1 and fan 2 become a whole. Compared with two independent fans, a motor and a frame and other structures are saved, thereby reducing the floor space of the entire fan and saving site space.

[0016] During the operation of Fan 1, impeller 1 centrifuges most of the wind in Fan 1 and discharges it from the air outlet of Fan 1. The wind discharged from Fan 1 is used to dry textiles, and part of the wind in Fan 1 also moves toward the ventilation hole through the action of impeller 1. Because the wind entering from Fan 1 has been accelerated by impeller 1, after entering Fan 2 and being accelerated by impeller 2, the wind flow rate is faster, so that the air pressure in Fan 2 is higher than that of single control. Therefore, the wind flowing out of Fan 2 is also stronger, which is suitable for the dust collection function in textile factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 for Figure 2 Enlarged view of part A in the middle; Figure 4 It is a structural schematic diagram of blade 1 in the present invention; Figure 5 It is a schematic diagram of the structure of blade 2 in the present invention.

[0018] In the figure: 1. base; 2. fan 1; 3. fan 2; 4. impeller 1; 5. impeller 2; 6. drive motor; 7. annular cover; 8. ventilation hole; 9. air inlet; 10. mounting plate; 11. annular plate; 12. blade 1; 13. centrifugal area; 14. axial flow area; 15. ventilation slot; 16. guide ring; 17. balancing blade; 18. wind guide cover; 19. wind collecting cover; 20. blade 2. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Single drive series fans, such as Figure 1 and Figure 2As shown, it includes a base 1, a fan 1 2 and a fan 2 3, both of which are centrifugal fans, which are fixedly connected to the base 1 by screws, and the fan 1 2 and the fan 2 3 are respectively provided with an impeller 1 4 and an impeller 2 5, and a driving motor 6 for synchronously driving the impeller 1 4 and the impeller 2 5 to rotate is fixedly connected to the base 1, and an annular cover 7 is fixedly connected between the fan 1 2 and the fan 2 3, one end of the output shaft of the driving motor 6 passes through the center of the annular cover 7 and is fixedly connected to the impeller 1 4, and a plurality of annular covers are provided on one side of the fan 1 2. The annular cover 7 is provided with a ventilation hole 8 connected to one end thereof, and the other end thereof is connected to the air inlet of the fan 2 3. A plurality of air inlets 9 are provided on the outer peripheral wall of the annular cover 7, and the plurality of air inlets 9 are distributed in a circular array on the outer peripheral wall of the annular cover 7. The impeller 1 4 can push part of the air volume in the fan 2 toward the ventilation hole 8. In the present invention, the impeller 1 4 and the impeller 2 5 are synchronously driven to rotate by the same driving motor 6, so that the fan 2 and the fan 2 3 become a whole. Compared with two independent fans, a motor and a frame structure are saved, thereby reducing the total air volume of the fan 2. The floor space of the machine is reduced, which saves the space of the site. Both fan 1 2 and fan 2 3 are centrifugal fans, so the air inlets and air outlets of the two fans are not in a straight line. Fan 1 2 and fan 2 3 both have independent air inlets. The difference is that the wind in fan 2 3 enters the annular cover 7 through the air inlet 9 on the annular cover 7, and then enters the fan 2 3 through the air inlet of fan 2 3. During the operation of fan 1 2, the impeller 1 4 centrifuges most of the wind in fan 2 and discharges it from the air outlet of fan 2. The wind discharged from fan 2 Used for drying textiles, wherein part of the wind in fan 2 is also moved toward the ventilation hole 8 through the action of impeller 4, so that the wind enters the annular cover 7 through the ventilation hole 8 under the action of impeller 4, and then enters fan 2 3. Because the wind entering from fan 2 has been accelerated by impeller 4, after entering fan 2 3, it is accelerated by impeller 2 5, making the flow rate of the wind faster, so that the air pressure in fan 2 3 is higher than that of single control, so the wind flowing out of fan 2 3 is also stronger, which is suitable for the dust collection function in textile factories.

[0021] like Figure 2 , Figure 3 and Figure 4As shown, the impeller 4 includes a mounting plate 10 and an annular plate 11, and a plurality of blades 12 are fixedly connected between the mounting plate 10 and the annular plate 11. The output shaft of the drive motor 6 is fixedly connected to the mounting plate 10. The blades 12 include a centrifugal area 13 and an axial flow area 14. The mounting plate 10 is provided with a plurality of ventilation slots 15, and the ventilation slots 15 are located at the projection position of the axial flow area 14 on the mounting plate 10. The blades 12 have a certain curvature whether they are in the centrifugal area 13 or in the axial flow area 14. The main function of the centrifugal area 13 is to push the air in the fan 2 away from the center direction of the fan 2, and the main function of the axial flow area 14 is to push the air in the fan 2 toward the ventilation slots 15. Because the blades 12 have a certain curvature, the centrifugal area 13 can also push a part of the wind toward the ventilation slots 15. The area of ​​the centrifugal area 13 is larger than the axial flow area 14. Due to the area of ​​the flow zone 14, the main function of the blade 12 is to push the wind in the fan 2 toward the outlet of the fan 2, but a certain ability of the axial flow fan is retained to push part of the air volume toward the ventilation slot 15. A guide ring 16 is fixedly connected to the inner edge of the annular plate 11. The diameter of the guide ring 16 is smaller as it is farther away from the annular plate 11. The axial flow zone 14 is the part from the blade 12 to the guide ring 16. During the rotation of the blade 12, because the inner wall of the guide ring 16 has a certain angle, the direction of the wind moving away from the center of the fan 2 will change after contacting the inner wall of the guide ring 16. That is, the wind moving away from the center of the fan 2 in the axial flow zone 14 will be converted into wind moving toward the ventilation slot 15, so that most of the wind in the axial flow zone 14 can be pushed toward the ventilation slot 15.

[0022] like Figure 2 and Figure 3As shown, all ventilation holes 8 form a ventilation area on the mounting plate 10, and the ventilation area is annular. The projection of the ventilation slots 15 on the inner wall of the fan 2 is located on the ventilation area. The ventilation holes 8 are evenly arranged on the ventilation area, so that the ventilation volume at each position of the ventilation area is the same. This arrangement allows the wind flowing out of the ventilation slots 15 during the rotation of the impeller 4 to enter the annular cover 7 through the ventilation area. A plurality of balancing blades 17 are fixedly connected to the side of the annular plate 11 facing away from the mounting plate 10. The balancing blades 17 can generate a balancing force for the impeller 4 toward the annular cover 7. In order to ensure the strength of the fan 2 shell, the ventilation area There is still a certain distance between each ventilation hole 8 inside. Therefore, when the axial wind generated by the impeller 4 flows to the position where the ventilation hole 8 is not opened in the ventilation area, it will have a certain reverse force on the impeller 4, so that the impeller 4 has a tendency to move in the direction away from the annular cover 7, which can easily cause the impeller 4 to vibrate to a certain extent on the output shaft of the drive motor 6. The setting of the balancing blade 17 enables the balancing blade 17 to generate a balancing wind in the direction of the annular cover 7 during the rotation of the impeller 4. The balancing wind hits the impeller 4 and can offset part of the reaction, thereby reducing the vibration of the impeller 4 on the output shaft of the drive motor 6.

[0023] like Figure 2 and Figure 3 As shown, a plurality of balancing blades 17 are arranged near the outer edge of the annular plate 11, and an air guide hood 18 is fixedly connected to the inner edge of the air inlet of the fan 2. One end of the air guide hood 18 extends into the fan 2 and is close to the guide ring 16. The closer the diameter of the air guide hood 18 is to the guide ring 16, the smaller it is. The air guide hood 18 can gather the wind and the minimum diameter of the guide ring 16 is greater than the minimum diameter of the guide ring 16 close to the air guide hood 18, so that the wind going out of the air guide hood 18 can be smoothly sucked into the guide ring 16, so that it is not easy to interfere with the balanced wind generated by the position of the balancing blade 17. There is a distance between the air guide hood 18 and the guide ring 16, so that when the impeller 4 vibrates to a certain extent, it is not easy for the guide ring 16 and the air guide hood 18 to interfere with each other, thereby ensuring the safety between the guide ring 16 and the air guide hood 18. A wind gathering hood 19 is fixedly connected to the annular cover 7, one end of the wind gathering hood 19 is fixedly connected to the air inlet of the fan 2 3, and the other end of the wind gathering hood 19 is fixedly connected to the inner circumferential wall of the annular cover 7. All air inlets 9 are located on the side of the wind gathering hood 19 facing away from the fan 2 3. The wind gathering hood 19 is arranged in the annular cover 7, and can gather the wind entering the annular cover 7, so that the wind pressure of the wind entering the fan 2 3 is greater, and the wind pressure in the fan 2 3 is guaranteed. The arrangement of the wind gathering hood 19 allows the annular cover 7 to have a larger cross-sectional area while ensuring the wind pressure in the fan 2 3. The large cross-sectional area of ​​the annular cover 7 indicates that the diameter of the annular cover 7 is also relatively large, so that more air inlets 9 can be opened on the outer surface of the annular cover 7, ensuring the air intake of the fan 2 3.

[0024] like Figure 2 , Figure 4 and Figure 5 As shown, impeller 25 includes a plurality of blades 20. Impeller 25 can only generate wind facing away from the center of fan 23. Specifically, blade 20 is arranged in a rectangular body. Compared with blade 12, blade 20 has no curvature, so that blade 20 cannot generate axial wind, thereby ensuring the air outlet efficiency of fan 23.

[0025] like Figure 1 As shown, in this embodiment, both fan 1 2 and fan 2 3 are driven by 90KW, 2P motor as drive motor 6, wherein fan 1 2 has an air volume of 14000m³ / H and a pressure of 13000PA under the independent drive of drive motor 6, and fan 2 3 has an air volume of 2000m³ / H and a pressure of 10000PA under the independent drive of drive motor 6. After fan 1 2 and fan 2 3 are connected in series and synchronously driven by drive motor 6, the air volume at the outlet of fan 1 2 is 12000m³ / H and the pressure is 13000PA, and the air volume at the outlet of fan 2 3 is 2000m³ / H and the pressure is 13000PA, and the air volume at the outlet of fan 2 3 is 2000m³ / H and the pressure is 2000m³ / H. m³ / H, and the pressure is 22000PA. After comparing the above data, it is found that the air volume of fan 2 is only 14.3% less than that of single control. The loss of this air volume is relatively small, and the wind pressure in fan 2 is almost unchanged, so that the air volume of fan 2 can still ensure the drying effect of textiles. Compared with independent control, the wind pressure of fan 23 is increased by 1.2 times, from the original 10000PA to 22000PA, so that the internal wind pressure of fan 23 can reach the wind pressure of efficient dust collection, so that this wind pressure can meet the dust collection effect, and the air volume of fan 23 is almost unchanged. It can be obtained from the above that after fan 23 is connected in series through the above structure, the wind pressure in fan 23 is higher than that in fan 2, so that the wind pressures in fans 12 and 23 can respectively meet the effects of fabric drying and dust collection.

[0026] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A single-drive series fan, characterized in that: The invention comprises a base (1), a fan 1 (2) and a fan 2 (3), wherein the fan 1 (2) and the fan 2 (3) are centrifugal fans, and the fan 1 (2) and the fan 2 (3) are respectively provided with an impeller 1 (4) and an impeller 2 (5), and the base (1) is fixedly connected with a driving motor (6) for synchronously driving the impeller 1 (4) and the impeller 2 (5) to rotate, and an annular cover (7) is fixedly connected between the fan 1 (2) and the fan 2 (3), and a plurality of ventilation holes (8) connected to one end of the annular cover (7) are provided on one side of the fan 1 (2), and the other end of the annular cover (7) is connected to the air inlet of the fan 2 (3), and a plurality of air inlets (9) are provided on the outer peripheral wall of the annular cover (7), and the impeller 1 (4) can push part of the air volume in the fan 1 (2) toward the ventilation hole (8); The impeller 1 (4) comprises a mounting plate (10) and an annular plate (11), a plurality of blades 1 (12) are fixedly connected between the mounting plate (10) and the annular plate (11), the output shaft of the drive motor (6) is fixedly connected to the mounting plate (10), the blade 1 (12) comprises a centrifugal area (13) and an axial flow area (14), the area of ​​the centrifugal area (13) is larger than the area of ​​the axial flow area (14), and the mounting plate (10) is provided with a plurality of ventilation slots (15), the ventilation slots (15) are located at the projection position of the axial flow area (14) on the mounting plate (10).

2. The single-drive series fan according to claim 1, characterized in that: A guide ring (16) is fixedly connected to the inner edge of the annular plate (11), and the diameter of the guide ring (16) decreases as it moves away from the annular plate (11). The axial flow area (14) is the portion of the blade 1 (12) extending to the guide ring (16).

3. The single-drive series fan according to claim 2, characterized in that: All the ventilation holes (8) form a ventilation area on the mounting plate (10), the ventilation area being annular, and the projection of the ventilation slot (15) on the inner wall of the fan 1 (2) is located on the ventilation area.

4. The single-drive series fan according to claim 3, characterized in that: A plurality of balancing blades (17) are fixedly connected to a side of the annular plate (11) facing away from the mounting plate (10), and the balancing blades (17) are capable of generating a balancing force for the impeller 1 (4) in the direction of the annular cover (7).

5. The single-drive series fan according to claim 4, characterized in that: A plurality of the balancing blades (17) are arranged near the outer edge of the annular plate (11); an air guide cover (18) is fixedly connected to the inner edge of the air inlet of the fan one (2); one end of the air guide cover (18) extends into the fan one (2) and is close to the guide ring (16); the diameter of the air guide cover (18) decreases as it approaches the guide ring (16); and the minimum diameter of the guide ring (16) is greater than the minimum diameter of the air guide cover (18) when it is close.

6. The single-drive series fan according to claim 5, characterized in that: The annular cover (7) is fixedly connected with an air collecting cover (19), one end of the air collecting cover (19) is fixedly connected to the air inlet of the second fan (3), and the other end of the air collecting cover (19) is fixedly connected to the inner peripheral wall of the annular cover (7), and all the air inlets (9) are located on the side of the air collecting cover (19) facing away from the second fan (3).

7. The single-drive series fan according to claim 6, characterized in that: The impeller 2 (5) includes a plurality of blades 2 (20), and the impeller 2 (5) can only generate wind facing away from the center of the fan 2 (3).

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