Heat dissipation assembly and ventilator

Abstract

The heat dissipation assembly comprises an installation ring and a plurality of heat dissipation blades, the installation ring is provided with a peripheral face, and the heat dissipation blades are arranged on the peripheral face at intervals in the circumferential direction. The radiating blades are provided with first ends and second ends in the radial direction of the mounting ring, the first ends are provided with planes A, and the second ends are provided with planes D; the plane A and the heat dissipation blades intersect to obtain a point E1 and a point E2, a straight line between the point E1 and the point E2 is connected to form a straight line segment L1, the included angle between the straight line segment L1 and the axis L0 of the mounting ring is alpha, and the value range of alpha is 15-26 degrees; the plane D and the heat dissipation blades intersect to obtain a point E3 and a point E4, a straight line between the point E3 and the point E4 is connected to form a straight line segment L2, the included angle between the straight line segment L2 and the axis L0 of the mounting ring is beta, and the value range of beta is 20-30 degrees; and beta is greater than alpha. According to the heat dissipation assembly, airflow can be more effectively guided, streamline deviation is reduced, vortex and turbulent flow are reduced, and therefore air loss is reduced, and the air outlet amount is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature fan technical field especially relates to a heat dissipation subassembly and ventilating fan. BACKGROUND

[0002] At present, the circulating fan applied to the heat treatment furnace, heating furnace and the working medium for high temperature gas induced draft fan collectively called high temperature fan. The common feature of this kind of fan is that the medium temperature contacted by its gas flow part is extremely high. In the process of fan operation, the internal high temperature will be conducted to the fan transmission assembly through the main shaft, especially the bearing close to the impeller end, resulting in this part of bearing being in high temperature state for a long time, thereby becoming the vulnerable point of the whole machine. High temperature not only accelerates the wear of bearing material, but also may cause lubrication failure, seriously affecting the service life and reliability of the fan.

[0003] In order to solve this problem, the traditional high temperature fan structure design adds an aluminum heat dissipation fan between the bearing and the impeller, which enhances the convective heat transfer intensity of heat, so as to ensure that the bearing close to the impeller end can operate stably within the allowable temperature range.

[0004] However, although the traditional structure type performs well in the lower temperature range, when the temperature exceeds 250 DEG C or higher, only by adding a heat dissipation fan can not meet the demand of high temperature fan for heat dissipation performance. In order to delay the effect of heat conduction, engineers have to take another strategy: increase the distance from the impeller to the bearing. Although this method reduces the temperature of the bearing to a certain extent, it also brings new problems: the increase of distance leads to the increase of cantilever length of fan transmission group, which may cause the reduction of fan critical speed, and increase the hidden trouble of vibration exceeding the standard. Vibration not only reduces the operating efficiency of the fan, but also may cause damage to the structure of the fan, which seriously threatens the stable operation of the fan. SUMMARY

[0005] In order to overcome at least one of the defects of the prior art described above, one of the purposes of the utility model is to provide a heat dissipation assembly, which adjusts the installation angle of the heat dissipation blade, avoids the problem that the heat dissipation assembly has poor heat dissipation effect on the high temperature end bearing due to uneven radial pressure distribution.

[0006] The second purpose of the utility model is to provide a ventilating fan, which adopts the heat dissipation assembly described above, can significantly improve the critical speed, and prevent the key components such as high temperature end bearing from being damaged due to overheating.

[0007] One of the technical solutions adopted by the utility model to solve the problem is:

[0008] A heat dissipation assembly includes a mounting ring having an outer circumferential surface and a plurality of heat dissipation fins arranged on the outer circumferential surface in a circumferential direction; the heat dissipation fins have a first end and a second end in a radial direction of the mounting ring, the first end has a plane A, and the second end has a plane D;

[0009] The plane A intersects the heat dissipation fins to obtain a point E1 and a point E2, a straight line connecting the point E1 and the point E2 is a straight line segment L1, an included angle between the straight line segment L1 and an axis L0 of the mounting ring is α, the α is in a range of 15°-26°; the plane D intersects the heat dissipation fins to obtain a point E3 and a point E4, a straight line connecting the point E3 and the point E4 is a straight line segment L2, an included angle between the straight line segment L2 and the axis L0 of the mounting ring is β, the β is in a range of 20°-30°; and the β is greater than the α.

[0010] Further, the α is 20°, and the β is 25°.

[0011] Further, a plane B and a plane C are arranged between the plane A and the plane D, the plane B intersects the heat dissipation fins to obtain a point E5 and a point E6, a straight line connecting the point E5 and the point E6 is a straight line segment L3, an included angle between the straight line segment L3 and the axis L0 of the mounting ring is γ, and the γ is 22°;

[0012] The plane C intersects the heat dissipation fins to obtain a point E7 and a point E8, a straight line connecting the point E7 and the point E8 is a straight line segment L4, an included angle between the straight line segment L4 and the axis L0 of the mounting ring is δ, and the δ is 24°.

[0013] Further, a height difference between the plane A and the plane B, a height difference between the plane B and the plane C, and a height difference between the plane C and the plane D are equal or in an arithmetic progression.

[0014] Further, the plane A intersects the heat dissipation fins to obtain a windward line L5 and a wind guide line L6, the windward line L5 and the wind guide line L6 are both curved lines connecting the point E1 and the point E2, and the windward line L5 and the wind guide line L6 are both located on the same side of the straight line segment L1.

[0015] The plane D intersects the heat dissipation vane to obtain a windward line L7 and a wind guide line L8, the windward line L7 and the wind guide line L8 are both curved lines between the point E3 and the point E4, and the windward line L7 and the wind guide line L8 are both located on the same side of the straight line segment L2; the windward line L5 extends towards the windward line L7 to form a windward surface of the heat dissipation vane, and the wind guide line L6 extends towards the wind guide line L8 to form a wind guide surface of the heat dissipation vane.

[0016] The technical solution two for solving the problem is that:

[0017] A ventilator, comprising a rotating shaft, a bearing assembly and a heat dissipation assembly as claimed in any one of claims 1-6, the rotating shaft is rotatably connected with the bearing assembly, and the heat dissipation assembly is arranged on one side of the bearing assembly; the mounting ring has an inner circumferential surface, the inner circumferential surface is closely combined with the rotating shaft, and the rotating shaft is used to drive the heat dissipation assembly to rotate, so that the heat dissipation assembly dissipates heat for the bearing assembly.

[0018] Further, the heat dissipation device comprises a flow guide cover, the flow guide cover surrounds the outer periphery of the heat dissipation assembly, the flow guide cover has an air inlet side, the flow guide cover is provided with an air inlet on the air inlet side, and the caliber of the air inlet gradually decreases along the direction from the air inlet side to the air inlet side.

[0019] Further, the heat dissipation device comprises an impeller assembly, two ends of the rotating shaft are a high-temperature end and a low-temperature end respectively, and the impeller assembly is arranged at the high-temperature end; the bearing assembly comprises a first bearing piece and a second bearing piece, the second bearing piece is arranged at the low-temperature end, the rotating shaft is further provided with a mounting position, the first bearing piece is arranged at the mounting position, and the first bearing piece is arranged close to the impeller assembly; the heat dissipation assembly is arranged on the side of the first bearing piece away from the impeller assembly, and the heat dissipation assembly is used to guide the airflow from the low-temperature end to the first bearing piece.

[0020] Further, the cantilever distance between the mounting position and the high-temperature end is D, and the value range of the D is 200mm-400mm.

[0021] In summary, the heat dissipation assembly and the ventilator provided by the utility model have the following technical effects:

[0022] 1) The heat dissipation assembly of the present application sets the installation angle of the first end of the heat dissipation blade in the range of 15°-26°, sets the installation angle of the second end in the range of 20°-30°, and makes the installation angle of the second end greater than that of the first end, so that the heat dissipation blade presents a three-dimensional twisted structure, can more effectively guide the airflow, reduce the streamline deviation, reduce the vortex and turbulence, and thus reduce the wind loss. At the same time, the radial pressure distribution of the heat dissipation assembly is more uniform, and the airflow can gradually adjust the direction when passing through the radial flow channel of the heat dissipation blade, thereby improving the heat dissipation efficiency.

[0023] 2) The optimization of the installation angle of the heat dissipation blade increases the air volume of the heat dissipation assembly, and forms a strong cooling convection around the equipment to be cooled (such as a high-temperature bearing), quickly takes away the heat, and realizes efficient heat dissipation.

[0024] 3) The ventilator of the present application adopts the above-mentioned optimized heat dissipation assembly, which can significantly improve the critical speed, maintain the stable operation of the ventilator, and the forced cooling effect of the heat dissipation assembly can prevent the high-temperature end bearing assembly from being damaged due to overheating, thereby helping to prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective structural schematic view of the ventilator of the present application embodiment.

[0026] Figure 2 It is a partial sectional view of the ventilator of the present application embodiment.

[0027] Figure 3 It is a front view of the heat dissipation assembly of the present application embodiment.

[0028] Figure 4 It is a structural schematic view of the cross section of the heat dissipation blade at different heights.

[0029] Among them, the meaning of the reference signs is as follows:

[0030] 1, impeller assembly; 11, hub; 12, blade; 2, rotating shaft; 21, high-temperature end; 22, installation position; 23, low-temperature end; 3, first bearing part; 31, first bearing; 32, first bearing seat; 4, second bearing part; 41, second bearing; 42, second bearing seat; 5, heat dissipation assembly; 50, air guide surface; 51, mounting ring; 52, heat dissipation blade; 55, plane A; 56, plane B; 57, plane C; 58, plane D; 59, windward surface; 6, flow guide cover; 61, air inlet. DETAILED DESCRIPTION

[0031] In order to better understand and implement, the technical solutions in the present application embodiments will be clearly and completely described below in combination with the drawings in the present application embodiments.

[0032] In the description of the utility model, it is necessary to explain, the term "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and so on the orientation or position relation indicated is based on the orientation or position relation shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the device or element must have a particular orientation, a particular orientation is constructed and operated, therefore it cannot be understood as the limitation of the utility model.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The term used in the specification of the utility model herein is only for the purpose of describing the specific embodiments and is not intended to limit the utility model.

[0034] Referring to Figures 1 to 4 The utility model discloses a heat dissipation assembly 5, it includes the mounting ring 51 and a plurality of heat dissipation blades 52, specifically, the mounting ring 51 has the outer circumferential surface, and a plurality of heat dissipation blades 52 are spaced apart on the outer circumferential surface along the circumferential direction. Figure 3 Heat dissipation blade 52 has first end and second end along the radial direction of mounting ring 51, referring to Figure 4 The first end has plane A55, and the second end has plane D58, wherein, plane A55 and heat dissipation blade 52 are crossed and get point E1 and point E2, the straight line connection between point E1 and point E2 is straight line segment L1, and the included angle between straight line segment L1 and the axis L0 of mounting ring 51 is α, the value range of α is 15 °-26 °. Correspondingly, plane D58 and heat dissipation blade 52 are crossed and get point E3 and point E4, the straight line connection between point E3 and point E4 is straight line segment L2, and the included angle between straight line segment L2 and the axis L0 of mounting ring 51 is β, the value range of β is 20 °-30 °, and β is greater than α.

[0035] On the basis of the structure, when the heat dissipation assembly 5 is used, during assembly, the first end of one heat dissipation fin 52 is installed on the outer circumferential surface of the mounting ring 51 at an installation angle of 15°-26°, at which time the included angle a between the straight line segment L1 on the plane A55 at the first end and the axis L0 of the mounting ring 51 is equal to the installation angle of the first end. At the same time, the second end of the heat dissipation fin 52 is installed on the outer circumferential surface of the mounting ring 51 at an installation angle of 20°-30°, at which time the included angle β between the straight line segment L2 on the plane D58 at the second end and the axis L0 of the mounting ring 51 is equal to the installation angle of the second end. Then, a plurality of identical heat dissipation fins 52 are sequentially assembled at the same interval along the circumference of the outer circumferential surface, and the plurality of heat dissipation fins 52 are installed at the same installation angle. Finally, the mounting ring 51 of the heat dissipation assembly 5 is fixed to the equipment that needs to be cooled, such as the periphery of a high-temperature bearing, and the heat dissipation assembly 5 is driven to rotate by the transmission set.

[0036] When the heat dissipation assembly 5 rotates to work, part of the air around the heat dissipation fin 52 is discharged, thereby locally forming a vacuum degree in the heat dissipation assembly 5, that is, a local negative pressure is generated relative to the atmospheric pressure, so that the airflow produces directional flow, so that the airflow is continuously introduced into the heat dissipation assembly 5 from one side of the heat dissipation assembly 5 along the axial direction. Since the heat dissipation assembly 5 is rotating, the rotational motion of the heat dissipation fin 52 will generate a tangential force on the incoming airflow. This tangential force not only makes the airflow flow along the axial direction of the heat dissipation assembly 5, but also receives a radial component along the radial direction of the heat dissipation assembly 5, so that the airflow flows along the radial direction of the heat dissipation assembly 5. As the airflow penetrates deeper, it will be further guided by the fin 12 and discharged from the other side of the heat dissipation assembly 5.

[0037] Subsequently, the heat dissipation assembly 5 forms a cooling strong convection around the equipment to be cooled (such as a high-temperature bearing), which quickly takes away the heat of the equipment to be cooled and its vicinity through the cooling strong convection, thereby quickly and efficiently cooling the equipment to be cooled.

[0038] It should be noted that the first end is the root end of the heat dissipation fin 52 close to the outer circumferential surface of the mounting ring 51, and the plane A55 is tangent to the outer circumferential surface of the mounting ring 51; the second end is the top end of the heat dissipation fin 52 away from the outer circumferential surface, and the plane D58 is tangent to the top end of the heat dissipation fin 52. Among them, the axis L0 of the mounting ring 51 is parallel to the plane A55 and the plane D58, and the projection line segment of the axis L0 of the mounting ring 51 on the plane A55 and the straight line segment L1 on the plane A55 form an included angle a, and the projection line segment of the axis L0 of the mounting ring 51 on the plane D58 and the straight line segment L2 on the plane D58 form an included angle β.

[0039] In use, the heat dissipation assembly 5 is subjected to airflow in both axial and radial directions, and the actual velocity of the airflow formed by the heat dissipation assembly 5 is the resultant velocity of the airflow in the two directions. According to the principle of fluid mechanics, the greater the actual velocity of the airflow, the greater the air volume guided by the heat dissipation assembly 5, and the stronger the cooling effect on the equipment to be cooled, when the cross-sectional area of the air outlet remains constant. The installation angle of the heat dissipation blades 52 is one of the important factors affecting the resultant velocity of the airflow.

[0040] It can be understood that the circumferential velocity of the radial flow passage of the heat dissipation blades 52 is different at different radii, and the circumferential velocity of the heat dissipation blades 52 at the second end is the greatest, forming a distribution rule that the outlet pressure increases with the increase of the radius. For the straight blades 12 with the same installation angle at the first end and the second end, the flow passage at the first end and the second end will both produce serious airflow separation, resulting in unstable airflow in the flow passage. At the same time, airflow separation will cause the radial pressure distribution of the heat dissipation assembly 5 to become uneven; specifically, in the region of the blade tip, due to the high airflow velocity and large attack angle, the centrifugal force generated is also large, so that the pressure in this region is relatively high. The increase of the outlet pressure in the blade tip region will hinder the smooth discharge of the airflow, exacerbate the flow deviation, and thus reduce the air volume guided out by the heat dissipation assembly 5. The reduction of the air volume means that the heat dissipation assembly 5 can take away less heat from the equipment to be cooled, and thus the cooling effect is reduced.

[0041] Therefore, the present application sets the installation angles of the first end and the second end to be different, so that the heat dissipation blades 52 present a three-dimensional twisted structure, so that the airflow can gradually adjust the direction when passing through the radial flow passage of the heat dissipation blades 52, and reduce the flow deviation. At the same time, the installation angle of the second end is set to be greater than that of the first end, so as to reduce the outlet pressure at the second end, make the radial pressure distribution of the heat dissipation assembly 5 more uniform, and the flow passage at the first end and the second end is not prone to serious airflow separation, so that the airflow is discharged more smoothly, and the air volume is increased. Thus, the flow passage of the heat dissipation blades 52 can more effectively guide the airflow, thereby improving the unevenness of the radial pressure distribution of the heat dissipation assembly 5.

[0042] Specifically, the following takes the installation angles of the heat dissipation blades 52 at the first end and the second end as examples and comparative examples, and takes the wind speed measured at the air outlet side of the heat dissipation assembly 5 (since the present application only changes the installation angle of the heat dissipation blades 52, the cross-sectional area of the air outlet remains constant, and the wind speed is proportional to the air volume) and the temperature difference generated by the equipment to be cooled at the same initial temperature for the same time as the effect representation, to explain the airflow guiding effect of the heat dissipation assembly 5:

[0043] Example 1

[0044] In this embodiment, α = 15°, β = 20°, that is, the installation angle of the first end is 15° and the installation angle of the second end is 20°. After testing, the wind speed measured at the air outlet side of the heat dissipation assembly 5 is 26 m / s, and the temperature difference of the heat dissipation device to be cooled is 25℃.

[0045] Example 2

[0046] In this embodiment, α = 26°, β = 30°, that is, the installation angle of the first end is 26° and the installation angle of the second end is 30°. After testing, the wind speed measured at the air outlet side of the heat dissipation assembly 5 is 28 m / s, and the temperature difference of the heat dissipation device to be cooled is 30℃.

[0047] Example 3

[0048] In this embodiment, α = 15°, β = 30°, that is, the installation angle of the first end is 15° and the installation angle of the second end is 30°. After testing, the wind speed measured at the air outlet side of the heat dissipation assembly 5 is 27 m / s, and the temperature difference of the heat dissipation device to be cooled is 28℃.

[0049] Example 4

[0050] In this embodiment, α = 20°, β = 25°, that is, the installation angle of the first end is 20° and the installation angle of the second end is 25°. After testing, the wind speed measured at the air outlet side of the heat dissipation assembly 5 is 29 m / s, and the temperature difference of the heat dissipation device to be cooled is 32℃.

[0051] Comparative Example 1

[0052] In this comparative example, α = 10°, β = 15°, that is, the installation angle of the first end is 10° and the installation angle of the second end is 15°. After testing, the wind speed measured at the air outlet side of the heat dissipation assembly 5 is 21 m / s, and the temperature difference of the heat dissipation device to be cooled is 18℃.

[0053] Comparative Example 2

[0054] In this comparative example, α = 30°, β = 35°, that is, the installation angle of the first end is 30° and the installation angle of the second end is 35°. After testing, the wind speed measured at the air outlet side of the heat dissipation assembly 5 is 25 m / s, and the temperature difference of the heat dissipation device to be cooled is 23℃.

[0055] Comparative Example 3

[0056] In this comparative example, α = 10°, β = 35°, that is, the installation angle of the first end is 10° and the installation angle of the second end is 35°. After testing, the wind speed measured at the air outlet side of the heat dissipation assembly 5 is 16 m / s, and the temperature difference of the heat dissipation device to be cooled is 15℃.

[0057] Comparative Example 4

[0058] In the present comparative example, a = 26°, β = 26°, i.e. the installation angle of the first end is 26° and the installation angle of the second end is 26°. After testing, the air speed measured at the air outlet side of the heat dissipation assembly 5 is 25 m / s, and the temperature difference of the heat dissipation device is 24°C.

[0059] Comparative Example 5

[0060] In the present comparative example, a = 26°, β = 20°, i.e. the installation angle of the first end is 26° and the installation angle of the second end is 20°. After testing, the air speed measured at the air outlet side of the heat dissipation assembly 5 is 24 m / s, and the temperature difference of the heat dissipation device is 23°C.

[0061] It should be noted that the air flow speed can be measured by setting a testing instrument such as an anemometer (e.g. a cup anemometer, a hot-wire anemometer or a digital anemometer), an air speed sensor or a laser Doppler velocimeter, etc. at the air outlet side of the heat dissipation assembly 5, and the temperature difference of the heat dissipation device can be measured by a thermometer, a thermocouple, etc. The temperature difference of the heat dissipation device is equal to the temperature before heat dissipation minus the temperature after heat dissipation.

[0062] The corresponding test results of the above-mentioned embodiments and comparative examples are arranged in the form of a table as follows:

[0063]

[0064]

[0065] Comparing the test results of the embodiments and comparative examples, when a is in the range of 15°-26°, β is in the range of 20°-30°, and β is greater than a, the air speed measured at the air outlet side of the heat dissipation assembly 5 is higher, which can reach up to 29 m / s, and the temperature difference of the heat dissipation device is larger, with the maximum temperature difference reaching 32°C; i.e. the heat dissipation assembly 5 exhibits better heat dissipation effect. This is because the installation angles of the first end and the second end of the heat dissipation blades 52 are moderate, the air flow is distributed more evenly in the radial direction between the blades, the air flow can be more smoothly guided and discharged, reducing vortex and turbulence, thereby reducing energy loss and improving heat dissipation performance.

[0066] As can be seen from Example 1 and Example 3, although the installation angle of the first end is small, the increase of the installation angle of the second end can reduce the outlet pressure of the second end, so that the airflow obtains a greater speed at the outlet, thereby increasing the air volume on the air outlet side and improving the heat dissipation effect. However, as can be seen from Comparative Example 1, if the installation angles of the first end and the second end are both too small, the airflow will not flow smoothly between the blades 12, and the heat dissipation effect is poor. Meanwhile, as can be seen from Comparative Example 3, the installation angle of the first end is too small, and the installation angle of the second end is too large, and the angle change from the first end to the second end is large. This extreme combination leads to extremely uneven distribution of the airflow between the blades 12, and the heat dissipation effect is extremely poor.

[0067] As can be seen from Example 2 and Example 3, as the installation angle of the first end increases, the airflow obtains a stronger tangential force under the action of the heat dissipation blades 52, thereby improving the heat dissipation efficiency. However, as can be seen from Comparative Example 2, when the installation angle of the first end is too large, although the airflow can obtain a larger tangential force, it may also cause impact and turbulence of the airflow between the blades 12, thereby reducing the heat dissipation efficiency.

[0068] As can be seen from Example 1, Example 2 and Example 4, the installation angles of the first end and the second end are both moderate, and the angle change from the first end to the second end is small, so that the airflow is uniformly distributed between the blades 12 and can obtain sufficient tangential force, thereby realizing efficient heat dissipation.

[0069] In addition, as can be seen from Comparative Example 4, although the installation angles are consistent, the advantages of guiding the airflow at different angles at different positions are lacking, the radial pressure distribution of the heat dissipation assembly 5 is uneven, and the heat dissipation effect is not as ideal as that of Example 4. As can be seen from Comparative Example 5, the installation angle of the first end is large, and the installation angle of the second end is small, which will hinder the flow of the airflow between the blades 12, thereby reducing the heat dissipation efficiency.

[0070] In summary, by setting the value range of a to be 15°-26°, the value range of β to be 20°-30°, and β greater than a, the heat dissipation blades 52 present a three-dimensional twisted structure, and the outlet pressure at the second end is reduced, so that the second end part with a higher peripheral speed can drive the heat dissipation blades 52 to work. Thereby, the radial pressure distribution of the heat dissipation assembly 5 can be more uniform, the airflow has uniform load distribution in the flow channel of each blade 12, the airflow can gradually adjust the direction when passing through the radial flow channel of the heat dissipation blades 52, reduce the streamline deviation, and reduce the vortex and turbulence, thereby reducing the wind loss and increasing the air volume.

[0071] Further, the value of a is 20°, and the value of β is 25°.

[0072] Specifically, as can be seen from the above embodiment 4, the reasonable values of α and β ensure the stable flow of air between the heat dissipation blades 52, so that the air flow is balanced under the action of the axial and radial forces of the heat dissipation assembly 5, avoiding the air flow disorder or blockage phenomenon caused by too large or too small angle, thereby further improving the actual speed (resultant velocity) of the air flow and improving the stability and reliability of the heat dissipation assembly 5.

[0073] Further, referring to Figure 3 and Figure 4 , a plane B56 and a plane C57 are provided between the plane A55 and the plane D58. Specifically, the plane B56 intersects the heat dissipation blades 52 to obtain a point E5 and a point E6, and a straight line connecting the point E5 and the point E6 is a straight line segment L3, and the included angle between the straight line segment L3 and the axis L0 of the mounting ring 51 is γ, and the value of γ is 22°.

[0074] Among them, the plane C57 intersects the heat dissipation blades 52 to obtain a point E7 and a point E8, and a straight line connecting the point E7 and the point E8 is a straight line segment L4, and the included angle between the straight line segment L4 and the axis L0 of the mounting ring 51 is δ, and the value of δ is 24°.

[0075] On the basis of this structure, the plane A55 and the plane D58 serve as the inlet and outlet of the radial flow channel of the heat dissipation blades 52, respectively guiding the air flow into and out of the radial flow channel. The plane B56 and the plane C57 are located between the inlet and the outlet, and they further optimize the path and speed of the air flow by adjusting the included angles γ and δ.

[0076] Among them, the included angle γ and the included angle δ are set so that the air flow can gradually accelerate when passing through the heat dissipation blades 52, and reach the maximum speed at the outlet, thereby enhancing the heat dissipation effect. By adjusting the included angles γ and δ, the air flow can maintain a relatively stable speed and direction when passing through the heat dissipation blades 52, and this stability helps to reduce air flow disorder and energy loss, thereby improving the overall performance of the heat dissipation assembly 5.

[0077] In this embodiment, the plane A55 with α of 20°, the plane B56 with γ of 22°, the plane C57 with δ of 24°, and the plane D58 with β of 25° can be used, and the heat dissipation blades 52 formed by the four planes can guide the air flow to obtain sufficient tangential force at the inlet of the blades 12 and a larger speed at the outlet, and because the angle change amplitude from the first end to the second end is uniform, the air flow is uniformly distributed between the blades 12, and the blades 12 can guide the air flow at different angles at different positions, so that the radial pressure distribution of the heat dissipation assembly 5 is uniform, thereby increasing the air volume on the outlet side and improving the heat dissipation effect.

[0078] In addition, the heat dissipation assembly 5 can be adapted to different application scenarios and heat dissipation requirements by adjusting the values of the included angles α, γ, δ and β. For example, in high-temperature or high-load application scenarios, the heat dissipation efficiency can be improved by increasing the values of the included angles β and δ; while in low-temperature or low-load application scenarios, the energy consumption and noise can be reduced by reducing the values of the included angles α and γ.

[0079] Further, the height difference between the plane A55 and the plane B56, the height difference between the plane B56 and the plane C57, and the height difference between the plane C57 and the plane D58 are equal or in an arithmetic progression.

[0080] When the height differences between the plane A55 and the plane B56, the plane B56 and the plane C57, and the plane C57 and the plane D58 are set to be equal, the radial flow passage of the blade 12 changes uniformly between these cross sections. Such uniform change helps to maintain stable flow velocity and pressure gradient of the fluid within the flow passage. In the radial flow passage, uniform cross-sectional height difference can ensure that the resistance encountered by the fluid during flow is relatively consistent, thereby avoiding the situation of excessively high or low local pressure.

[0081] When these height differences are in an arithmetic progression, although the change of the flow passage is not completely uniform, the change is gradual. Such gradual change also helps to maintain stable flow of the fluid. In the case of an arithmetic progression, the height differences between each cross section are different, but the difference is controllable, so the fluid can gradually adapt to these changes during flow, without causing sharp fluctuations in pressure distribution.

[0082] From the perspective of pressure balance, whether the height differences are equal or in an arithmetic progression, it helps to reduce the turbulence and vortex phenomena of the fluid in the flow passage, thereby reducing the unevenness of pressure distribution caused by energy loss of the fluid.

[0083] That is, by optimizing the height differences between cross sections and installing at different installation angles at different cross-sectional heights, the present application can ensure that the fluid maintains a laminar flow state during flow, thereby more effectively transmitting pressure.

[0084] Further, referring to Figure 4 The plane A55 intersects the heat dissipation blade 52 to obtain a windward line L5 and a wind guide line L6. Specifically, the windward line L5 and the wind guide line L6 are both curved lines connecting the point E1 and the point E2, and the windward line L5 and the wind guide line L6 are located on the same side of the straight line segment L1.

[0085] In addition, the plane D58 intersects the heat dissipation blades 52 to obtain a windward line L7 and a guide wind line L8. Specifically, the windward line L7 and the guide wind line L8 are both curved lines between the point E3 and the point E4, and the windward line L7 and the guide wind line L8 are both located on the same side of the straight line segment L2. The windward surface 59 of the heat dissipation blade 52 is formed by extending the windward line L5 towards the windward line L7, and the guide wind surface 50 of the heat dissipation blade 52 is formed by extending the guide wind line L6 towards the guide wind line L8.

[0086] Therefore, the flow channel of the heat dissipation assembly 5 is formed between the windward surface 59 of the heat dissipation blade 52 and the guide wind surface 50 of the adjacent heat dissipation blade 52. After the airflow enters the heat dissipation assembly 5, it first contacts the windward surface 59 of the heat dissipation blade 52. Since the windward surface 59 is formed by extending the windward line L5 towards the windward line L7, the airflow can be effectively guided along the radial direction of the flow channel. At the same time, part of the airflow is guided out of the flow channel in the axial direction at different heights along the guide wind line and the windward line under the action of the axial force.

[0087] Specifically, the windward line L5 and the guide wind line L6 are both located on the same side of the straight line segment L1, and the windward line L7 and the guide wind line L8 are both located on the same side of the straight line segment L2. When the airflow enters the heat dissipation assembly 5, it can be guided along a continuous and smooth path, which can reduce sudden turning or turbulence of the airflow during flow, and improve the flow efficiency of the airflow.

[0088] At the same time, the installation angles of the heat dissipation blades 52 at the first end and the second end are different, so that the windward surface 59 and the guide wind surface 50 both present a twisted surface structure, which can guide the airflow to gradually adjust the direction when flowing in the radial direction.

[0089] Referring to Figure 1 and Figure 2 The application also discloses a ventilator, which comprises a rotating shaft 2, a bearing assembly and the heat dissipation assembly 5 as described above. Specifically, the rotating shaft 2 is rotatably connected with the bearing assembly, and the heat dissipation assembly 5 is arranged on one side of the bearing assembly. Referring to Figure 3 The mounting ring 51 of the heat dissipation assembly 5 has an inner circumferential surface which is closely attached to the rotating shaft 2. The rotating shaft 2 can drive the heat dissipation assembly 5 to rotate, so that the heat dissipation assembly 5 can dissipate heat for the bearing assembly.

[0090] Based on the above structure, when the ventilator of the application is used, the motor drives the rotating shaft 2 to start rotating when the ventilator starts, so that the rotating shaft 2 drives the heat dissipation assembly 5 to rotate together. In the process of rotating the heat dissipation assembly 5, it can guide the airflow into the heat dissipation assembly 5, do work on the airflow to accelerate it, and then guide the airflow to the bearing assembly through the flow channel, so as to form a strong cooling convection around the bearing assembly, thereby quickly taking away the heat of the bearing assembly and its surrounding area, and achieving the heat dissipation effect.

[0091] Due to the installation angle of the heat dissipation vane 52 is optimized, the air outlet of the heat dissipation assembly 5 is larger, so the heat dissipation assembly 5 can better dissipate heat for the bearing assembly, preventing the bearing assembly from being damaged due to long-term overheating, large vibration of the ventilator during operation and other problems.

[0092] Further, the heat dissipation device comprises a flow guide cover 6, specifically, the flow guide cover 6 surrounds the outer periphery of the heat dissipation assembly 5, the flow guide cover 6 has an air inlet side, and the flow guide cover 6 is provided with an air inlet 61 at the air inlet side, wherein the caliber of the air inlet 61 gradually decreases along the direction from the air inlet side to the direction away from the air inlet side.

[0093] On the basis of this structure, when the ventilator starts, the rotating shaft 2 drives the heat dissipation assembly 5 to rotate together, the heat dissipation assembly 5 first discharges part of the air inside the flow guide cover 6, thereby locally forming a vacuum degree in the flow guide cover 6, and the air inlet side generates suction to continuously suck air flow from the air inlet 61. The air flow sucked from the air inlet 61 enters the heat dissipation assembly 5 and is worked by the rotation of the heat dissipation assembly 5.

[0094] Wherein, the caliber of the air inlet 61 gradually decreases along the direction from the air inlet side to the direction away from the air inlet side, which can guide more air flow into the flow guide cover 6, and preliminarily accelerate the flow of air flow through the tapering caliber, and the accelerated air flow passes through the flow channel of the heat dissipation assembly 5 to dissipate heat for the bearing assembly and other key parts.

[0095] Therefore, the setting of the flow guide cover 6 can increase the outlet air speed of the air flow in the heat dissipation assembly 5, and enhance the heat dissipation effect of the heat dissipation assembly 5 on the bearing assembly. In addition, the flow guide cover 6 can prevent external sundries and dust from entering the inside of the heat dissipation assembly 5, and maintain the cleanliness and normal working state of the heat dissipation assembly 5.

[0096] Further, the heat dissipation device comprises an impeller assembly 1, specifically, the two ends of the rotating shaft 2 are a high-temperature end 21 and a low-temperature end 23, and the impeller assembly 1 is arranged at the high-temperature end 21. More specifically, the bearing assembly comprises a first bearing piece 3 and a second bearing piece 4, wherein the second bearing piece 4 is arranged at the low-temperature end 23, the rotating shaft 2 is further provided with a mounting position 22, the first bearing piece 3 is arranged on the mounting position 22, and the first bearing piece 3 is arranged close to the impeller assembly 1. In addition, the heat dissipation assembly 5 is arranged on the side of the first bearing piece 3 away from the impeller assembly 1, and the heat dissipation assembly 5 is used for guiding the air flow from the low-temperature end 23 to the first bearing piece 3.

[0097] On the basis of the structure, during assembly, the impeller assembly 1 can be arranged inside a high-temperature environment such as a toughening furnace, an incinerator, a cooling tower, etc., and the heat dissipation assembly 5, the bearing assembly and other driving components are arranged outside the high-temperature environment. During use, the motor drives the rotating shaft 2 to rotate, which can drive the impeller assembly 1 to rotate, so as to suck the gas into the impeller assembly 1 and accelerate the gas to form a high-speed airflow, so as to flow the air inside the high-temperature environment, which is beneficial to make the temperature distribution inside the high-temperature equipment more uniform and the temperature difference of each part smaller.

[0098] It should be noted that the heat inside the high-temperature environment is transmitted to the installation position 22 close to the high-temperature end 21 through the impeller assembly 1 and the rotating shaft 2, etc., so that the first bearing 3 close to the impeller assembly 1 is easily affected by the high temperature, which causes the problems such as high-temperature aging, poor supporting rotation effect, high failure maintenance rate, etc., which affect normal production.

[0099] Therefore, the heat dissipation assembly 5 is arranged close to the first bearing 3, and the airflow is guided to the first bearing 3 from the low-temperature end 23 by the heat dissipation assembly 5, so as to forcibly cool the first bearing 3 by strong convection, thereby preventing a series of potential problems caused by the high temperature of the first bearing 3.

[0100] The high-temperature end 21 of the rotating shaft 2 is not provided with a bearing, and the impeller assembly 1 is only supported by the suspended section between the high-temperature end 21 and the first bearing 3. Therefore, the heat dissipation assembly 5 is arranged on the side of the first bearing 3 away from the impeller assembly 1, that is, the heat dissipation assembly 5 is arranged between the first bearing 3 and the second bearing 4, which can reduce the weight of the high-temperature end 21 of the rotating shaft 2.

[0101] In addition, the impeller assembly 1 comprises blades 12 and a hub 11, the blades 12 are mounted on the hub 11, and the hub 11 is connected with the high-temperature end 21 of the rotating shaft 2.

[0102] Further, the first bearing 3 comprises a first bearing seat 32 and a first bearing 31, and the rotating shaft 2 is rotatably connected with the first bearing seat 32 through the first bearing 31; the second bearing 4 comprises a second bearing seat 42 and a second bearing 41, and the rotating shaft 2 is rotatably connected with the second bearing seat 42 through the second bearing 41.

[0103] Further, the cantilever distance between the installation position 22 and the high-temperature end 21 of the rotating shaft 2 is D, and the value range of D is 200mm-400mm.

[0104] The value range of the cantilever distance D is set to 200mm-400mm, which is not randomly set, and it needs to consider the influence of the heat of the high-temperature end 21 on the first bearing 3 and the critical speed of the ventilator.

[0105] Specifically, if the cantilever distance D is small, the rigidity of the rotating shaft 2 at the high-temperature end 21 is relatively large, so the critical speed of the ventilator is also large. This means that at a higher speed, the ventilator can still operate stably. At the same time, a small cantilever distance D can also cause the first bearing 3 to be too close to the high-temperature end 21, thereby being affected by too much heat, increasing the wear and failure risk of the bearing.

[0106] Correspondingly, if the cantilever distance D is large, the rigidity of the rotating shaft 2 at the high-temperature end 21 is relatively small, resulting in a decrease in the critical speed. At a lower speed, the ventilator can resonate, affecting the stability and service life of the ventilator. At the same time, a large cantilever distance D can reduce the direct impact of heat from the high-temperature end 21 on the bearing, thereby improving the service life of the bearing.

[0107] In view of the above two contradictory situations, the present application optimizes the installation angle of the heat dissipation blades 52 of the heat dissipation assembly 5, increases the air volume of the heat dissipation assembly 5, so that the heat dissipation assembly 5 has a better heat dissipation effect than the conventional heat dissipation fan. Therefore, the cantilever distance D can be appropriately reduced, and the first bearing 3 can be quickly and forcibly cooled by the high-speed strong convection generated by the heat dissipation assembly 5, so as to reduce the impact of heat from the high-temperature end 21 on the first bearing 3. At the same time, the shorter cantilever distance D is conducive to increasing the critical speed of the ventilator, thereby ensuring the stable operation of the ventilator.

[0108] In addition, the ventilator of the present application has a compact structure, which is suitable for occasions where the installation size is limited, and meets the needs of vertical or horizontal installation of the ventilator.

[0109] The technical means disclosed in the technical scheme of the present application is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the scope of protection of the present application.

Claims

1. A heat dissipation assembly, characterized by: The mounting ring has an outer circumferential surface, and a plurality of heat dissipation blades are arranged on the outer circumferential surface in a circumferential direction; the heat dissipation blades have a first end and a second end in a radial direction of the mounting ring, the first end has a plane A, and the second end has a plane D; The plane A intersects the heat dissipation blade to obtain a point E1 and a point E2, a straight line between the point E1 and the point E2 is a straight line segment L1, an angle between the straight line segment L1 and an axis L0 of the mounting ring is α, the α is in a range of 15°-26°; the plane D intersects the heat dissipation blade to obtain a point E3 and a point E4, a straight line between the point E3 and the point E4 is a straight line segment L2, an angle between the straight line segment L2 and the axis L0 of the mounting ring is β, the β is in a range of 20°-30°, and the β is greater than the α.

2. The heat dissipation assembly of claim 1, wherein: The α is 20°, and the β is 25°.

3. The heat dissipating assembly according to claim 1 or 2, characterized in that: The plane A and the plane D are provided with a plane B and a plane C, the plane B intersects the heat dissipation blade to obtain a point E5 and a point E6, a straight line between the point E5 and the point E6 is a straight line segment L3, an angle between the straight line segment L3 and the axis L0 of the mounting ring is γ, and the γ is 22°; The plane C intersects the heat dissipation blade to obtain a point E7 and a point E8, a straight line between the point E7 and the point E8 is a straight line segment L4, an angle between the straight line segment L4 and the axis L0 of the mounting ring is δ, and the δ is 24°.

4. The heat dissipation assembly of claim 3, wherein: Height differences between the plane A and the plane B, between the plane B and the plane C, and between the plane C and the plane D are equal or in an arithmetic progression.

5. The heat dissipation assembly of claim 1, wherein: The plane A intersects the heat dissipation blade to obtain a windward line L5 and a wind guide line L6, the windward line L5 and the wind guide line L6 are both curved lines connecting the point E1 and the point E2, and the windward line L5 and the wind guide line L6 are both located on the same side of the straight line segment L1; The plane D intersects the heat dissipation blade to obtain a windward line L7 and a wind guide line L8, the windward line L7 and the wind guide line L8 are both curved lines connecting the point E3 and the point E4, and the windward line L7 and the wind guide line L8 are both located on the same side of the straight line segment L2; the windward line L5 extends towards the windward line L7 to form a windward surface of the heat dissipation blade, and the wind guide line L6 extends towards the wind guide line L8 to form a wind guide surface of the heat dissipation blade.

6. A ventilator characterized by: The mounting ring has an outer circumferential surface, and a plurality of heat dissipation blades are arranged on the outer circumferential surface in a circumferential direction; the heat dissipation blades have a first end and a second end in a radial direction of the mounting ring, the first end has a plane A, and the second end has a plane D; 7. The ventilator of claim 6, wherein: The heat dissipation device comprises a flow guide cover, the flow guide cover surrounds the periphery of the heat dissipation assembly, the flow guide cover has an air inlet side, the flow guide cover is provided with an air inlet on the air inlet side, and the caliber of the air inlet gradually decreases from the air inlet side to the direction away from the air inlet side.

8. The ventilator of claim 6, wherein: The heat dissipation device comprises an impeller assembly, both ends of the rotating shaft are high-temperature ends and low-temperature ends, and the impeller assembly is arranged at the high-temperature end; the bearing assembly comprises a first bearing and a second bearing, the second bearing is arranged at the low-temperature end, the rotating shaft is further provided with a mounting position, the first bearing is arranged at the mounting position, and the first bearing is arranged close to the impeller assembly; the heat dissipation assembly is arranged on the side of the first bearing away from the impeller assembly, and the heat dissipation assembly is used for guiding the airflow from the low-temperature end to the first bearing.

9. The ventilator of claim 8, wherein: The cantilever distance between the mounting position and the high-temperature end is D, and the value range of D is 200mm-400mm.

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