An impeller device for dynamically adjusting the dynamic balance in real time

Abstract

The present invention discloses an impeller body for dynamically adjusting the dynamic balance in real time, which comprises an impeller body and a blade group arranged thereon. An adaptive dynamic balance assembly is provided in the middle of the impeller body. The adaptive dynamic balance assembly includes a track and at least one balance unit arranged on the track. The balance unit can rotate around the center of the impeller body on the track. When the center of the impeller body is concentric with the center of its rotating shaft, the balance unit is located at a relative dynamic balance position and remains relatively stationary when the impeller body rotates. When the center of the impeller body is eccentric with the axis of the impeller body and its rotating shaft, the balance unit moves to another position on the track due to the rotational inertia of the impeller body, realizing the dynamic automatic balance adjustment of the impeller. When the mass of the impeller body is uneven, the balance unit moves on the track to keep the relative mass distribution on the impeller body uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of air change equipment, and particularly relates to an impeller device for dynamically adjusting dynamic balance in real time. Background Art

[0002] Most of the existing air change devices use impellers with a circular design as the drive. The central part is a hard metal sleeve, which reduces resistance and reduces excessive gaps caused by friction. In the traditional impeller design, an embedding hole is left in the center position of the impeller injection molding part, and a metal part is embedded in the embedding hole at the center of the circle to make it in a tight fit, and the center is equidistant from the surrounding blades. The more precise the process, the smoother it rotates during operation.

[0003] However, in the actual injection molding of the impeller, the density of the material is different due to the influence of pressure and thermal effects, and its mass is uneven. The weights of the blades distributed on the outer periphery of the impeller with the central axis are different, resulting in the center of gravity of the impeller not being on the axis line. Eventually, the impeller loses dynamic balance, showing centripetal instability. In severe cases, the main engine may shake, causing the machine to be unable to be used normally. Another reason for losing dynamic balance is that during the long-term rotation of the impeller, the rotating shaft or the middle hole of the impeller is worn, and the rotating shaft and the central axis of the impeller are not on the same straight line, resulting in an eccentricity and an unbalance amount.

[0004] The common method to correct dynamic balance is to use a dynamic balance detector to find the mass deviation point and the difference in weight, and use additional weights to achieve balance, thereby correcting the swing of the impeller during rotation. However, if the rigid axis is worn and the gap becomes larger after the impeller has been used for a long time, the dynamic balance is broken at this time, and the traditional method often cannot find the balance. This situation is relatively common in purifier equipment with impellers, and this situation generally occurs after 1-2 years of use.

[0005] A dynamic balancing method for an impeller in the prior art, an invention application with a publication number of CN110686829A, uses a dynamic balancing machine to conduct a dynamic balancing test on the impeller, and determines the phase that needs to be balanced and the required balancing mass of the impeller according to the indication of the dynamic balancing machine; Step 2, drill a number of counterweight holes at the phase positions of the radial edges of the hub and the shroud of the impeller respectively; Step 3, calculate the weight of the lead water counterweight; Step 4, pour the lead water counterweight into the counterweight holes and seal the counterweight holes with aluminum welding; Step 5, use a dynamic balancing machine to conduct a dynamic balancing test on the impeller, and detect whether the unbalance amount of the impeller is within the specified range. If the result is yes, proceed to the next step; if the result is no, go back to Step 1; Step 6, end the dynamic balancing test. To achieve the dynamic balance of the impeller, experimental debugging is required, and an object for counterweight is fixed on the impeller to offset the unbalanced force. However, this method cannot automatically adjust the counterweight position. Once the impeller shows an unbalance amount again, it is necessary to remove the impeller and conduct experimental debugging again, which is difficult to operate. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an impeller device for real-time dynamic adjustment of dynamic balance, realizing automatic balance adjustment of the impeller dynamically.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: An impeller main body for real-time dynamic adjustment of dynamic balance, including an impeller main body and a blade group provided thereon. An adaptive dynamic balance component is provided in the middle of the impeller main body. The adaptive dynamic balance component includes a track and at least one balance unit arranged on the track. The balance unit can rotate around the center of the impeller main body on the track. When the center of the impeller main body is concentric with the center of its rotating shaft, the balance unit is located at a relative dynamic balance position and remains relatively stationary when the impeller main body rotates. When the center of the impeller main body is eccentric with the axis of the impeller main body and its rotating shaft, the balance unit moves inertia along with the rotation of the impeller main body to another position on the track. This position refers to the position of the balance unit on the track when the impeller main body and the rotating shaft maintain relative dynamic balance, so as to offset the unbalanced radial force and enable the impeller main body to maintain dynamic balance on the rotating shaft; when the mass of the impeller main body is uneven, the balance unit moves on the track to keep the relative mass distribution on the impeller main body uniform.

[0008] Further, a plurality of adjustment regions are arranged circumferentially on the track, and a balance unit is provided in each adjustment region. When the center of the impeller main body is concentric with the center of its rotating shaft, the balance unit is located at the relative middle of the adjustment region and remains relatively stationary when the impeller main body rotates.

[0009] Further, the impeller body has a central hole for mating with the rotating shaft. The center of the adaptive dynamic balance assembly is located on the central axis of the impeller body, and the adaptive dynamic balance assembly is disposed close to the blade group, so that the center of gravity of the impeller body is close to the central hole, and the center of gravity of the adaptive dynamic balance assembly is close to the center of gravity of the impeller body.

[0010] Further, a mounting platform for installing the adaptive dynamic balance assembly is provided in the middle of the impeller body. The mounting platform protrudes towards the blade group, and the adaptive dynamic balance assembly is disposed on the back of the mounting platform.

[0011] Further, the two side contours of the balance unit tend to converge towards the axis of the impeller body.

[0012] Further, the track includes an outer fixing ring and an inner fixing ring coaxially arranged with the impeller body. The two ends of the balance unit are slidably sleeved on the outer fixing ring and the inner fixing ring.

[0013] Further, the adaptive dynamic balance assembly further includes a plurality of support members. The support members connect the impeller body and the track, and an adjustment area is formed between two support members. The balance unit is restricted to rotate on the adjustment area.

[0014] Further, a balance member is provided on one side of the mounting platform facing the impeller body. The balance member includes a first convex portion and a second convex portion. The first convex portion protrudes from the end face of the mounting platform, and the second convex portion extends between the mounting platform and the impeller body.

[0015] Further, the balance member further includes a plurality of balance ribs distributed on the first convex surface and the second convex surface. The balance ribs are arranged radially corresponding to the support members and the balance unit.

[0016] Further, a central hole is provided at the axis of the impeller body on the mounting platform. The central hole is in transmission cooperation with the rotating shaft, and a guide bearing is further provided on the central hole. The guide bearing extends out of the back end face of the impeller body and the front end face of the mounting platform.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. A balance unit is provided on the back of the impeller body. The balance unit slides on the track, and the track restricts the balance unit to always rotate around the central axis of the impeller body. When a radial gap appears between the central hole of the impeller body and the rotating shaft, the impeller body shakes on the rotating shaft. Under the inertial action of the eccentricity of the impeller body, the balance unit is subjected to an unbalanced radial force and slides on the track to a position opposite to the radial force, thereby automatically adjusting the dynamic balance of the impeller body in real time. At the same time, when the mass of the impeller body is uneven, the balance unit moves on the track to keep the relative mass distribution on the impeller body uniform;

[0018] 2. Multiple independent adjustment regions are set on the track, and a balance unit is set in each adjustment region. When the unbalanced radial force of the impeller body is too large, a single balance unit is restricted at the edge of the adjustment region, and the balance units on both sides of the adjustment region slide to achieve the dynamic balance of the impeller body, thereby increasing the stability during dynamic balance adjustment and reducing the impact of excessive sliding amplitude of the balance unit on the running stability of the impeller body, enabling the impeller body to quickly reach the dynamic balance state;

[0019] 3. The mounting table protrudes towards the blade group, so that the mounting table and the back of the impeller body form a concave cavity for installing the adaptive dynamic balance assembly. The rear part of the adaptive dynamic balance assembly can be received in the concave cavity, thereby reducing the limitation on the installation space of the impeller body. At the same time, since the blade group is arranged towards one side of the impeller body, the adaptive dynamic balance assembly arranged in the concave cavity makes the overall center of gravity of the impeller body close to the middle hole of the impeller body, thereby reducing the axial sway of the impeller body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the back structure of the impeller of the present invention;

[0021] Figure 2 Schematic diagram of the front structure of the impeller of the present invention;

[0022] Figure 3 Cross-sectional view of the impeller of the present invention;

[0023] Figure 4 Cross-sectional view of the impeller of the present invention from another angle;

[0024] Figure 5 Cross-sectional view of another embodiment of the present invention;

[0025] In the figure: 1. Impeller; 1.1. Mounting table; 1.2. Middle hole; 2. Blade group; 3. Track; 3.1. Inner fixing ring; 3.2. Outer fixing ring; 4. Balance unit; 5. Through hole; 6. Adjustment region; 7. Support member; 8. Balance member; 8.1. First convex part; 8.2. Second convex part; 8.3. Balance rib; 8.4. Balance ring strip; 9. Guide bearing; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be understood that although terms such as upper, middle, lower, top, one end, etc. appear in this text to describe various components, these components are not limited by these terms. These terms are only used to distinguish the components from each other for ease of understanding, rather than to define any directional or sequential limitations.

[0028] As Figures 1-5 shown, a device for a main impeller body 1 that dynamically adjusts the dynamic balance in real time includes the main impeller body 1 and a blade group 2 provided thereon. An adaptive dynamic balance component is provided in the middle of the main impeller body 1. The adaptive dynamic balance component includes a track 3 and at least one balance unit 4 arranged on the track 3. The balance unit 4 can rotate around the center of the main impeller body 1 on the track 3. When the axis of the main impeller body 1 is eccentric with its rotating shaft, the balance unit 4 moves to a relative dynamic balance position on the track 3 due to the rotational inertia of the main impeller body 1. Among them, in order to reduce the inertial effect of the main impeller body 1, a plurality of through holes 5 are evenly arranged at intervals in the circumferential direction of the main impeller body 1. The balance unit 4 slides on the track 3 through the track 3, and the balance unit 4 is restricted by the track 3 to always rotate around the central axis of the main impeller body 1. When a radial gap appears between the middle hole 1.2 of the main impeller body 1 and the rotating shaft, the main impeller body 1 shakes on the rotating shaft. As the main impeller body 1 rotates eccentrically, the balance unit 4 is subjected to an unbalanced radial force and slides on the track 3 to a position opposite to the radial force, thereby automatically adjusting the dynamic balance of the main impeller body 1 in real time; when the mass of the main impeller body is uneven, as the main impeller body rotates, the balance unit moves on the track to keep the relative mass distribution on the main impeller body uniform.

[0029] To solve the problem that when the unbalanced force is too large, the sliding amount of the balance unit 4 on the track 3 is too large, a plurality of adjustment regions 6 are arranged in the circumferential direction on the track 3. Each adjustment region 6 is provided with a balance unit 4. A plurality of independent adjustment regions 6 are arranged on the track 3, and each adjustment region 6 is provided with a balance unit 4. In this embodiment, the number of adjustment regions 6 is four. When the unbalanced radial force of the main impeller body 1 is too large, a single balance unit 4 slides to the edge limit position of the adjustment region 6 under the action of the unbalanced radial force. The balance units 4 on both sides of the adjustment region 6 slide a certain distance in their respective adjustment regions 6 to achieve the dynamic balance of the main impeller body 1. The four balance units 4 slide simultaneously, driving the main impeller body 1 to quickly reach the dynamic balance state, while increasing the stability during dynamic balance adjustment and reducing the influence of the too large sliding amplitude of the balance unit 4 on the running stability of the main impeller body 1.

[0030] To solve the problem of axial play between the impeller body 1 and the rotating shaft caused by the axial clearance of the hole 1.2 in the impeller body 1, a central hole 1.2 for mating with the rotating shaft is provided on the central axis of the impeller body 1. The center of the adaptive dynamic balance assembly is located on the central axis of the impeller body 1, and the adaptive dynamic balance assembly is disposed close to the blade group 2, so that the center of gravity of the impeller body 1 is close to the hole 1.2, and the center of gravity of the adaptive dynamic balance assembly is close to the center of gravity of the impeller body 1. The mounting table 1.1 protrudes towards the blade group 2, so that a concave cavity for installing the adaptive dynamic balance assembly is formed between the mounting table 1.1 and the back of the impeller body 1. The rear part of the adaptive dynamic balance assembly can be received in the concave cavity, thereby reducing the limitation on the installation space of the impeller body 1. At the same time, since the blade group 2 is disposed on one side of the impeller body 1, the adaptive dynamic balance assembly disposed in the concave cavity makes the overall center of gravity of the impeller body 1 close to the central hole 1.2 of the impeller body 1, thereby reducing the axial play of the impeller body 1.

[0031] As an explanation of the installation position of the adaptive dynamic balance assembly, the middle part of the impeller body 1 has a mounting table 1.1 for installing the adaptive dynamic balance assembly. The mounting table 1.1 protrudes towards the blade group 2, so as to form a concave cavity between the back of the mounting table 1.1 and the back of the impeller body 1. The adaptive dynamic balance assembly is disposed on the back of the mounting table 1.1 and placed in the concave cavity. The back of the adaptive dynamic balance assembly can be received in the concave cavity or close to the back plane of the impeller body 1.

[0032] Specifically, the two side contours of the balance unit 4 have a tendency to converge towards the axis of the impeller body 1. The balance unit 4 forms a small end and a large end. The small end is disposed towards the hole 1.2, and the included angle of the outer contour of the balance unit 4 can be between 20° and 30°. In this embodiment, it is preferably 20°.

[0033] Among them, preferably, the radial distance between the central axis of the impeller body 1 and the small end of the balance unit 4 is L1, the radial length of the balance unit 4 is L2, and the ratio range of L1 to L2 is between 0.8 and 1.2; the distance from the center of the blade group 2 on the outer contour of the impeller body 1 to the center of the impeller body 1 is L3, and the distance from the large end of the balance unit 4 to the center of the impeller body 1 is L4, and the ratio range of L3 to L4 is between 2.2 and 2.6.

[0034] Specifically, the track 3 includes an outer fixing ring 3.2 and an inner fixing ring 3.1 coaxially arranged with the impeller body 1. The two ends of the balance unit 4 are slidably sleeved on the outer fixing ring 3.2 and the inner fixing ring 3.1.

[0035] Specifically, the adaptive dynamic balance assembly further includes a plurality of support members 7. The support members 7 connect the impeller main body 1 and the track 3, and an adjustment area 6 is formed between two support members 7. The balance unit 4 is restricted to rotate on the adjustment area 6. Optionally, buffer pads are provided on the side walls of the support members 7.

[0036] Embodiment 2

[0037] An arc-shaped connecting section is formed between the mounting table 1.1 and the impeller main body 1. The number of the through holes 5 is six and they penetrate at the connecting section. A balance member 8 is provided on one side of the mounting table 1.1 facing the impeller main body 1. The balance member 8 includes a first convex portion 8.1 and a second convex portion 8.2. The first convex portion 8.1 protrudes from the end face of the mounting table 1.1, and the second convex portion 8.2 is connected to the first convex portion 8.1. The second convex portion 8.2 extends between the mounting table 1.1 and the impeller main body 1, that is, on the connecting section. In this embodiment, the first convex portion 8.1 is arranged in a hexagonal shape on the mounting table 1.1, and the second convex portion 8.2 is arranged in a strip shape.

[0038] Specifically, the balance member 8 further includes a plurality of balance rib strips 8.3 distributed on the first convex surface and the second convex surface. The balance rib strips 8.3 are arranged corresponding to the support members 7 and the balance unit 4 in the radial direction. It also includes a balance ring strip 8.4 connected to the balance rib strips 8.3. Both the balance rib strips 8.3 and the balance ring strip are provided on the first convex portion 8.1.

[0039] Embodiment 3

[0040] To further increase the rotational stability of the impeller main body, a central hole 1.2 is provided at the axis center of the impeller main body 1 on the mounting table 1.1. The central hole 1.2 is in transmission cooperation with the rotating shaft, and a guide bearing 9 is also provided on the central hole 1.2. The guide bearing 9 extends out of the back end face of the impeller main body 1 and the front end face of the mounting table 1.1. The guide bearing 9 is a split shoe type guide bearing 9, so as to bear the radial unbalance force of the impeller main body 1.

[0041] As Figure 5 shown, as an embodiment of the present invention, the first convex portion 8.1 is provided with a hollow interior, and a fluid is provided therein. The balance ring strip 8.4 and the balance rib strips 8.3 are blocked inside the first convex portion 8.1, thereby forming a plurality of balance chambers.

[0042] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. An impeller device for dynamically adjusting the dynamic balance in real time, comprising an impeller body (1) and a blade group (2) provided thereon. An adaptive dynamic balance assembly is provided in the middle of the impeller body (1), and it is characterized in that, The adaptive dynamic balance assembly includes an orbit (3) and at least one balance unit (4) arranged on the orbit (3). The balance unit (4) is arranged on the orbit (3) and can move along the orbit about the center of the impeller body (1). When the centers of the impeller body (1) and its rotating shaft (5) are eccentric, the balance unit (4) moves to another position on the orbit (3) under the action of the radial unbalanced force, so that the impeller body maintains dynamic balance on the rotating shaft. The middle part of the impeller body (1) has a mounting table (1.1) for installing the adaptive dynamic balance assembly. The mounting table (1.1) protrudes towards the blade group (2), and the adaptive dynamic balance assembly is arranged on the back of the mounting table (1.1). The orbit (3) includes an outer fixed ring (3.2) and an inner fixed ring (3.1) arranged coaxially with the impeller body (1). Both ends of the balance unit (4) are slidably sleeved on the outer fixed ring (3.2) and the inner fixed ring (3.1). On the side of the mounting table (1.1) facing the impeller body (1), there is a balance member (8). The balance member (8) includes a first convex part (8.1) and a second convex part (8.2). The first convex part (8.1) protrudes from the end face of the mounting table (1.1), and the second convex part (8.2) extends between the mounting table (1.1) and the impeller body (1). The balance member (8) further includes a plurality of balance ribs (8.3) distributed on the first convex surface and the second convex surface. The balance ribs (8.3) are arranged corresponding to the support member (7) and the balance unit (4) in the radial direction. It also includes a balance ring strip connected to the balance ribs. Both the balance ribs and the balance ring strip are arranged on the first convex part.

2. The impeller device for dynamically adjusting the dynamic balance in real time according to claim 1, wherein: A plurality of adjustment regions (6) are arranged circumferentially on the orbit (3), and a balance unit (4) is arranged in each adjustment region (6).

3. A kind of impeller device for dynamically adjusting the dynamic balance in real time according to claim 1, characterized in that: The impeller body (1) has a central hole (1.2) for cooperating with the rotating shaft (5). The center of the adaptive dynamic balance assembly is located on the central axis of the impeller body (1), and the adaptive dynamic balance assembly is arranged close to the blade group (2), so that the center of gravity of the impeller body (1) is close to the central hole (1.2).

4. The impeller device for dynamically adjusting the dynamic balance in real time according to claim 1, wherein: The two side contours of the balance unit (4) tend to converge towards the axis of the impeller body (1).

5. A kind of impeller device for dynamically adjusting the dynamic balance in real time according to claim 1, characterized in that: The adaptive dynamic balance assembly further includes a plurality of support members (7). The support members (7) connect the impeller body (1) and the orbit (3), and an adjustment region (6) is formed between two support members (7). The balance unit (4) is restricted to rotate on the adjustment region (6).

6. The impeller device for dynamically adjusting the dynamic balance in real time according to claim 1, wherein: The mounting table (1.1) is provided with a central hole (1.2) at the axis of the impeller body (1). The central hole (1.2) is in transmission cooperation with the rotating shaft (5), and a guide bearing (9) is also arranged on the central hole (1.2). The guide bearing (9) extends out of the back end face of the impeller body (1) and the front end face of the mounting table (1.1).

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