Energy-saving low-noise cooling fan

Abstract

The invention discloses an energy-saving low-noise cooling fan, which relates to the technical field of fans and comprises a centrifugal machine shell, an impeller mounted in the centrifugal machine shell and a motor for driving the impeller to rotate, a noise reduction assembly is arranged at an air inlet of the centrifugal machine shell and comprises an air cylinder vertically arranged at the air inlet and a guide cylinder coaxially arranged on the outer side of the air cylinder, the end, away from the centrifugal machine shell, of the guide cylinder is sealed, and the end, close to the centrifugal machine shell, of the guide cylinder is open. An annular space is formed between the end, close to the centrifugal machine shell, of the guide cylinder and the centrifugal machine shell, and an annular filter screen assembly is installed at the annular space. According to the cooling fan, the aerodynamic acoustic technology and the fluid mechanical technology are adopted, the high-efficiency fan is designed, the noise of the fan is low, in addition, the airflow rotation and resistive noise elimination technology is adopted for air inflow of the fan, and the overflow noise of an inlet of the fan is greatly reduced; and the volute of the fan adopts a resistive silencing technology, so that the overflow noise of an outlet of the fan is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fans, and in particular to an energy-saving and low-noise cooling fan. Background Art

[0002] Cooling fans are power fluid machines that use high-speed rotating impellers (centrifugal force) to work on gaseous media, and convert kinetic energy of gaseous media into potential energy (pressure energy) by changing the flow direction and flow velocity of gaseous media. Cooling fans are widely used in construction engineering, boilers, chemicals, petroleum and environmental protection industries, and have promising application prospects.

[0003] The motors dedicated to oil drilling platforms require external cooling fans. The existing cooling fans use "L-shaped air intake bellows, which do not have the function of reducing the fan overflow noise. In addition, the existing coolers have low pneumatic efficiency and high noise, resulting in a poor working environment on the drilling platform and noise that harms the health of personnel. Summary of the invention

[0004] The object of the present invention is to provide an energy-saving and low-noise cooling fan to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: The present invention provides an energy-saving and low-noise cooling fan, comprising a centrifugal casing, an impeller installed in the centrifugal casing, and a motor for driving the impeller to rotate; The air inlet of the centrifuge casing is provided with a noise reduction component, and the noise reduction component includes a wind tube vertically arranged at the air inlet and a guide tube coaxially arranged on the outside of the wind tube, the guide tube is sealed at one end away from the centrifuge casing, and the guide tube is open at one end close to the centrifuge casing, an annular gap is provided between the end of the guide tube close to the centrifuge casing and the centrifuge casing, and an annular filter assembly is installed at the annular gap; cylindrical sound-absorbing cotton is embedded on the outside of the wind tube, plate-shaped sound-absorbing cotton is provided on the inner side of the guide tube close to the sealed end, and a truncated cone-shaped sound-absorbing cotton is provided in the center of the plate-shaped sound-absorbing cotton.

[0006] Furthermore, a conical channel with a decreasing diameter is formed inside the air duct, and the small opening end of the conical channel faces the air inlet.

[0007] Furthermore, a first annular extension plate is arranged on the outer side of one end of the wind tube away from the centrifuge housing, and an annular embedding groove for accommodating cylindrical sound-absorbing cotton is formed between the first annular extension plate, the wind tube and the centrifuge housing.

[0008] Furthermore, spiral plates are evenly arranged on the inner side of the guide cylinder along its circumferential direction, and spiral grooves matching the spiral plates are evenly arranged on the first annular extension plate.

[0009] Furthermore, a second annular extension plate is arranged on the outer side of the open end of the guide cylinder, and a return spring is evenly arranged between the second annular extension plate and the centrifuge housing.

[0010] Furthermore, the centrifuge housing is provided with a mounting ring corresponding to the second annular extension plate, and the outer peripheral surface of the mounting ring protrudes outward to form an annular limiting protrusion; The annular filter assembly comprises a first rotating ring sleeved on the mounting ring, and the rotating ring is provided with an annular limiting groove adapted to the annular limiting protrusion; The annular filter assembly also includes a second rotating ring coaxially arranged on the second annular extension plate, the second rotating ring includes a first annular portion abutting against a side of the second annular extension plate away from the centrifuge housing, and a second annular portion connected to the outer edge of the first annular portion, a sliding connection structure is provided between the second annular portion and the outer peripheral surface of the second annular extension plate, the sliding connection structure includes a one-way bearing assembled on the second annular extension plate, and a sliding ring slidably assembled in the second annular portion, the inner ring of the one-way bearing is fixedly connected to the second annular extension plate, the outer ring of the one-way bearing is fixedly connected to the inner side of the sliding ring, and the sliding ring can only slide axially along the second annular portion; The annular filter assembly also includes a dust screen connected between the first rotating ring and the second rotating ring; The annular filter assembly also includes a toggle mechanism which is transmission-connected to the motor and can regularly toggle the guide cylinder to rotate a certain angle.

[0011] Furthermore, the toggle mechanism includes a gear box fixed on a side wall of a centrifuge casing away from the air outlet, the input shaft of the gear box is transmission-connected to the output shaft of the motor via a chain mechanism, a rotating shaft is fixed to the output shaft of the gear box, a support seat is provided on the outer peripheral surface of the centrifuge casing away from the centrifuge casing, one end of the rotating shaft away from the gear box passes through the support seat and extends to one side of the guide cylinder, a convex strip is provided on the outer side of the guide cylinder, and a toggle plate is provided on the rotating shaft on one side of the convex strip.

[0012] Furthermore, a middle portion of the dustproof net protrudes outward to form an arc shape, and spring rods are evenly arranged along the circumferential direction between the first rotating ring and the second rotating ring.

[0013] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects: 1. The cooling fan of the present invention adopts aeroacoustic technology and fluid mechanical technology to design a high-efficiency fan. The fan itself has low noise. In addition, the fan air intake adopts airflow rotation and resistive silencer technology, which greatly reduces the fan inlet overflow noise; the fan volute adopts resistive silencer technology to reduce the fan outlet overflow noise.

[0014] 2. The annular filter assembly of the present invention can vibrate the annular filter assembly through the regular rotation of the guide cylinder to automatically remove dust adhering to the annular filter assembly, thereby avoiding affecting the air intake of the fan and thus affecting the cooling effect of the cooling fan. In addition, in the process of continuous reciprocating movement of the guide cylinder, since the dustproof net continuously rotates in one direction, each part of the dustproof net can be transferred to the lower part of the centrifuge casing, which is conducive to removing dust on the dustproof net.

[0015] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle; Figure 2 is a second viewing angle structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the top view of the structure of the present invention; Figure 4 yes Figure 3 AA structural diagram; Figure 5 yes Figure 4 Schematic diagram of the local structure at A; Figure 6 It is a schematic diagram of the partial structure of the dustproof net of Example 2.

[0018] In the figure: 1-centrifuge casing; 11-motor; 12-impeller; 2-air cylinder; 21-cylindrical sound-absorbing cotton; 22-first annular extension plate; 23-spiral groove; 3-guide cylinder; 31-plate-shaped sound-absorbing cotton; 32-truncated cone-shaped sound-absorbing cotton; 33-annular embedded groove; 34-spiral plate; 35-second annular extension plate; 36-reset spring; 4-annular filter assembly; 41-mounting ring; 42-annular limiting protrusion; 43-first rotating ring; 44-annular limiting groove; 45-second rotating ring; 451-first annular part; 452-second annular part; 46-one-way bearing; 47-sliding ring; 48-dustproof net; 5-sliding mechanism; 51-gear box; 52-chain mechanism; 53-rotating shaft; 54-support seat; 55-convex strip; 56-sliding plate; 6-spring rod. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0020] Example 1, please refer to Figure 1-Figure 5 As shown, an energy-saving and low-noise cooling fan comprises a centrifugal casing 1, an impeller 12 installed in the centrifugal casing 1 and a motor 11 for driving the impeller 12 to rotate; the air inlet of the centrifugal casing 1 is provided with a noise reduction component, and the noise reduction component comprises a wind tube 2 vertically arranged at the air inlet and a guide tube 3 coaxially arranged on the outside of the wind tube 2, the guide tube 3 is sealed at one end away from the centrifugal casing 1, and the guide tube 3 is open at one end close to the centrifugal casing 1, an annular gap is provided between the end of the guide tube 3 close to the centrifugal casing 1 and the centrifugal casing 1, and an annular filter assembly 4 is installed at the annular gap; a cylindrical sound-absorbing cotton 21 is embedded in the outer side of the wind tube 2, a plate-shaped sound-absorbing cotton 31 is provided on the inner side of the guide tube 3 close to the sealed end, and a truncated cone-shaped sound-absorbing cotton 32 is provided at the center of the plate-shaped sound-absorbing cotton 31.

[0021] During use, the motor 11 drives the impeller 12 to rotate, and negative pressure is formed at the air inlet. After being filtered by the annular filter assembly 4, the external gas enters between the guide cylinder 3 and the wind cylinder 2, and then passes through the wind cylinder 2 from the inlet into the centrifuge casing 1. In this process, the airflow passes through the bending channel formed by the guide cylinder 3 and the wind cylinder 2 and enters the centrifuge casing 1, thereby extending the airflow path. Therefore, during the long-distance flow of the airflow, the cylindrical sound-absorbing cotton 21 and the plate-shaped sound-absorbing cotton 31 can absorb and reduce the noise of the airflow. At the same time, due to the setting of the guide cylinder 3, the guide cylinder 3 covers the outside of the wind cylinder, thereby effectively preventing the "overflow" of noise in the centrifuge casing 1. In addition, through the design of the guide cylinder 3 and the wind cylinder 2, when the airflow enters the air inlet cylinder 2, the airflow first flows radially and then flows axially, which is beneficial for the airflow to enter the centrifuge casing 1 to improve its flow uniformity and reduce noise generation.

[0022] In a specific embodiment of the present invention, a conical channel with a decreasing diameter is formed inside the air duct 2, and the small opening end of the conical channel faces the air inlet.

[0023] In a specific embodiment of the present invention, a first annular extension plate 22 is provided on the outer side of the wind tube 2 away from the centrifuge housing 1, and an annular embedding groove 33 for accommodating the cylindrical sound-absorbing cotton 21 is formed between the first annular extension plate 22, the wind tube 2 and the centrifuge housing 1.

[0024] In a specific embodiment of the present invention, spiral plates 34 are evenly arranged on the inner side of the guide cylinder 3 along its circumferential direction, and spiral grooves 23 adapted to the spiral plates 34 are evenly arranged on the first annular extension plate 22. Based on the above design, on the one hand, the strength of the combination of the guide cylinder 3 and the wind cylinder 2 can be improved, and on the other hand, when the airflow enters between the guide cylinder 3 and the wind cylinder 2 and is discharged, the mutual collision between the airflows is reduced through the spiral channel between the adjacent spiral plates 34, thereby reducing the generation of noise.

[0025] In a specific embodiment of the present invention, a second annular extension plate 35 is disposed on the outer side of the open end of the guide tube 3 , and a return spring 36 is evenly disposed between the second annular extension plate 35 and the centrifuge housing 1 .

[0026] Based on the above design, the guide tube 3 has a certain elastic expansion and contraction after installation. In this way, when the guide tube 3 is accidentally hit during transportation or use, the guide tube 3 can undergo a certain axial displacement relative to the wind tube 2, thereby avoiding damage to the connection between the guide tube 3 and the wind tube 2.

[0027] In a specific embodiment of the present invention, a mounting ring 41 corresponding to the second annular extension plate 35 is provided on the centrifuge housing 1, and an annular limiting protrusion 42 is formed on the outer peripheral surface of the mounting ring 41 protruding outwards; The annular filter assembly 4 comprises a first rotating ring 43 sleeved on a mounting ring 41, and an annular limiting groove 44 adapted to the annular limiting protrusion 42 is provided on the rotating ring; The annular filter assembly 4 also includes a second rotating ring 45 coaxially arranged on the second annular extension plate 35, the second rotating ring 45 includes a first annular portion 451 that abuts against the side of the second annular extension plate 35 away from the centrifuge housing 1, and a second annular portion 452 connected to the outer edge of the first annular portion 451, a sliding connection structure is provided between the second annular portion 452 and the outer peripheral surface of the second annular extension plate 35, the sliding connection structure includes a one-way bearing 46 mounted on the outer peripheral surface of the second annular extension plate 35, and a sliding ring 47 slidably mounted on the inner side of the second annular portion 452, the inner side of the one-way bearing 46 is fixedly connected to the second annular extension plate 35, the outer side of the one-way bearing 46 is fixedly connected to the inner side of the sliding ring 47, and the sliding ring 47 can only slide axially along the second annular portion 452; The annular filter assembly 4 includes a dust screen 48 connected between the first rotating ring 43 and the second rotating ring 45; The annular filter assembly 4 also includes a toggle mechanism 5 which is transmission-connected to the motor 11 and can regularly toggle the guide tube 3 to rotate a certain angle.

[0028] Based on the above design, during use, the guide cylinder 3 can be rotated a certain amount by the toggle mechanism 5, and when the guide cylinder 3 is rotated a certain amount, the spiral plate 34 and the spiral groove 23 can cooperate to make the guide cylinder 3 have a certain axial displacement toward the centrifuge casing. In this process, the reset spring 36 is compressed, the one-way bearing 46 is in a locked state, and the guide cylinder 3 can drive the first rotating ring 43, the dustproof net 48 and the second rotating ring 45 to rotate a certain amount. When the guide cylinder 3 rotates to the maximum angle, under the elastic action of the reset spring 36, the guide cylinder 3 moves away from the centrifuge casing. One side of the casing 1 moves axially and reverses. At this time, the one-way bearing 46 is in an active state, and the first rotating ring 43, the dustproof net 48 and the second rotating ring 45 do not rotate. After the guide cylinder 3 is reset, it will hit the first annular portion 451 of the second rotating ring 45 and cause the dustproof net 48 to vibrate, thereby causing the dust on the dustproof net 48 to be shaken off. It is worth mentioning that in the process of continuous reciprocating movement of the above-mentioned guide cylinder 3, since the dustproof net 48 continuously rotates in one direction, each part of the dustproof net 48 can be transferred to the lower part of the centrifuge casing 1, which is conducive to the falling of dust on the dustproof net 48.

[0029] In a specific embodiment of the present invention, the toggle mechanism 5 includes a gear box 51 fixed on a side wall of the centrifuge casing away from the air outlet, the input shaft of the gear box 51 is connected to the output shaft of the motor 11 through a chain mechanism 52, the output shaft of the gear box 51 is fixed with a rotating shaft 53, a support seat 54 is provided on the outer peripheral surface of the centrifuge casing, one end of the rotating shaft 53 away from the gear box 51 passes through the support seat 54 and extends to one side of the guide cylinder 3, a convex strip 55 is provided on the outer side of the guide cylinder 3, and a toggle plate 56 is provided at the position of the rotating shaft 53 corresponding to the convex strip 55.

[0030] Based on the above design, when the motor 11 drives the impeller 12 to rotate, the motor 11 will synchronously drive the input shaft of the gear box 51 to rotate through the chain mechanism 52, and the gear box 51 will slowly rotate its output shaft through the cooperation of its internal gear set, thereby causing the rotating shaft 53 to slowly rotate. During the slow rotation of the rotating shaft 53, the cooperation between the shift plate 56 and the convex strip 55 of the guide cylinder 3 can cause the guide cylinder 3 to rotate a certain amount periodically.

[0031] Example 2, based on implementation 1, Figure 6 As shown, the middle portion of the dustproof net 48 protrudes outward to form an arc shape, and spring rods 6 are evenly arranged along the circumferential direction between the first rotating ring 43 and the second rotating ring 45.

[0032] Under normal conditions, the spring rod 6 is in its shortest state and the reset spring 36 is in its normal state. When the guide tube 3 is reset and hits the second rotating ring 45, the guide tube 3 has a certain impact to increase the distance between the second rotating rings 45 and the second rotating rings 45, thereby stretching the spring rod 6 and causing a certain deformation of the dustproof net 48, which is conducive to the falling of dust from the dustproof net 48.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An energy-saving and low-noise cooling fan, comprising a centrifuge casing, an impeller installed in the centrifuge casing, and a motor for driving the impeller to rotate; It is characterized in that The air inlet of the centrifuge casing is provided with a noise reduction component, and the noise reduction component includes a wind tube vertically arranged at the air inlet and a guide tube coaxially arranged on the outside of the wind tube, the guide tube is sealed at one end away from the centrifuge casing, and the guide tube is open at one end close to the centrifuge casing, an annular gap is provided between the end of the guide tube close to the centrifuge casing and the centrifuge casing, and an annular filter assembly is installed at the annular gap; cylindrical sound-absorbing cotton is embedded on the outside of the wind tube, plate-shaped sound-absorbing cotton is provided on the inner side of the guide tube close to the sealed end, and a truncated cone-shaped sound-absorbing cotton is provided in the center of the plate-shaped sound-absorbing cotton.

2. The energy-saving and low-noise cooling fan according to claim 1 is characterized in that: A conical channel with a decreasing diameter is formed inside the air cylinder, and the small opening end of the conical channel faces the air inlet.

3. The energy-saving and low-noise cooling fan according to claim 1, characterized in that: A first annular extension plate is arranged on the outer side of one end of the wind tube away from the centrifuge housing, and an annular embedding groove for accommodating cylindrical sound-absorbing cotton is formed between the first annular extension plate, the wind tube and the centrifuge housing.

4. The energy-saving and low-noise cooling fan according to claim 3 is characterized in that: The inner side of the guide cylinder is evenly provided with spiral plates along the circumferential direction thereof, and the first annular extension plate is evenly provided with spiral grooves adapted to the spiral plates.

5. The energy-saving and low-noise cooling fan according to claim 4 is characterized in that: A second annular extension plate is arranged outside the open end of the guide cylinder, and a return spring is evenly arranged between the second annular extension plate and the centrifuge housing.

6. The energy-saving and low-noise cooling fan according to claim 5, characterized in that: The centrifuge housing is provided with a mounting ring corresponding to the second annular extension plate, and the outer peripheral surface of the mounting ring protrudes outward to form an annular limiting protrusion; The annular filter assembly comprises a first rotating ring sleeved on the mounting ring, and the rotating ring is provided with an annular limiting groove adapted to the annular limiting protrusion; The annular filter assembly also includes a second rotating ring coaxially arranged on the second annular extension plate, the second rotating ring includes a first annular portion abutting against a side of the second annular extension plate away from the centrifuge housing, and a second annular portion connected to the outer edge of the first annular portion, a sliding connection structure is provided between the second annular portion and the outer peripheral surface of the second annular extension plate, the sliding connection structure includes a one-way bearing assembled on the second annular extension plate, and a sliding ring slidably assembled in the second annular portion, the inner ring of the one-way bearing is fixedly connected to the second annular extension plate, the outer ring of the one-way bearing is fixedly connected to the inner side of the sliding ring, and the sliding ring can only slide axially along the second annular portion; The annular filter assembly also includes a dust screen connected between the first rotating ring and the second rotating ring; The annular filter assembly also includes a toggle mechanism which is transmission-connected to the motor and can regularly toggle the guide cylinder to rotate a certain angle.

7. The energy-saving and low-noise cooling fan according to claim 6, characterized in that: The toggle mechanism includes a gear box fixed on a side wall of a centrifuge casing away from the air outlet, the input shaft of the gear box is transmission-connected to the output shaft of the motor through a chain mechanism, a rotating shaft is fixed to the output shaft of the gear box, a support seat is arranged on the outer peripheral surface of the centrifuge casing away from the centrifuge casing, one end of the rotating shaft away from the gear box passes through the support seat and extends to one side of the guide cylinder, a convex strip is arranged on the outer side of the guide cylinder, and a toggle plate is arranged on the rotating shaft on one side of the convex strip.

8. The energy-saving and low-noise cooling fan according to claim 7, characterized in that: The middle part of the dustproof net protrudes outward to form an arc shape, and spring rods are evenly arranged along the circumferential direction between the first rotating ring and the second rotating ring.

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