Impeller backlash fine adjustment mechanism

Abstract

The utility model relates to an impeller backlash fine adjustment mechanism. The gear box comprises a gear box body, the first transmission assembly is arranged on the gear box body and comprises a first transmission shaft as well as a first thrust disc I, an adjustable bearing, a first thrust disc II and a first gear which are sequentially arranged on the first transmission shaft; the adjusting assembly comprises a mounting seat mounted on the gear box body, a connecting piece and an adjusting pad, and the adjusting part and the mounting seat are connected through the connecting piece so that the adjusting pad can abut against the position between the first face and the second face; the second transmission assembly is arranged on the gear box body and comprises a second transmission shaft as well as a second thrust disc I, a second gear and a second thrust disc II which are sequentially arranged on the second transmission shaft; the impeller assembly comprises a volute and an impeller arranged in the volute and connected with the second transmission shaft, an impeller backlash is formed between the volute and the impeller, and the size of the impeller backlash can be adjusted by adjusting the thickness of an adjusting pad. According to the utility model, the impeller backlash can be adjusted without opening the gearbox cover.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, and in particular to an impeller side clearance fine adjustment mechanism. Background Technology

[0002] In the production and maintenance of existing single-stage high-speed centrifugal fans, the clearance between the semi-open impeller and the volute (commonly known as impeller side clearance) needs to be precisely adjusted. If the side clearance is too large, it will lead to a decrease in impeller efficiency; if the side clearance is too small, it may cause scrapping, damage to the impeller, or even scrap the entire high-speed rotor.

[0003] In existing small-sized fans with a thrust disc structure and horizontal parting, the adjustment of impeller side clearance usually relies on changing the thickness of the shims in the bearing slots of the low-speed shaft. This adjustment method requires disassembling the gearbox cover, which is complex and labor-intensive, and especially in space-constrained field environments, it greatly increases the difficulty and inconvenience of maintenance. Summary of the Invention

[0004] Therefore, this utility model provides an impeller side clearance fine adjustment mechanism, which can adjust the impeller side clearance without opening the gearbox cover, saving time and labor costs, and can be easily operated even in situations with limited space.

[0005] To solve the above-mentioned technical problems, this utility model provides an impeller side clearance fine adjustment mechanism, comprising:

[0006] Gearbox housing;

[0007] A first transmission assembly is disposed on the gearbox body, including a first transmission shaft and a first thrust disk I, an adjustable bearing, a first thrust disk II, and a first gear sequentially disposed on the first transmission shaft; wherein, the first adjustable bearing has an axial clearance fit with the first thrust disk I and the first thrust disk II, and the adjustable bearing is provided with an adjustment part, the adjustment part having a first surface;

[0008] An adjustment assembly includes a mounting base, a connector, and an adjustment pad mounted on the gearbox housing. The mounting base has a second surface facing the first surface. The connector connects the adjustment part to the mounting base and causes the adjustment pad to abut against the first surface and the second surface.

[0009] The second transmission assembly is disposed on the gearbox body and includes a second transmission shaft and a second thrust disk I, a second gear and a second thrust disk II sequentially disposed on the second transmission shaft; wherein, the radially outer end of the first gear is axially clearance-fitted with the second thrust disk I and the second thrust disk II, and the second gear meshes with the first gear;

[0010] An impeller assembly includes a volute and an impeller disposed within the volute and connected to a second drive shaft. The volute forms an impeller side clearance between the impellers. The size of the impeller side clearance can be adjusted by adjusting the thickness of the adjusting shim.

[0011] In one embodiment of this utility model, the adjusting part extends radially outward along the adjustable bearing and forms a ring structure.

[0012] In one embodiment of the present invention, the mounting base includes a mounting portion connected to the gearbox body and a connecting portion extending from the mounting portion, and an adjustment groove is formed between the mounting portion, the connecting portion and the gearbox body for the adjustment portion to extend into.

[0013] In one embodiment of this utility model, the mounting part abuts against the gearbox body and the two are connected by fixing screws.

[0014] In one embodiment of this utility model, the connector includes a fastening screw, which passes through the connecting part and the adjusting shim in sequence and is threadedly connected to the connecting part.

[0015] In one embodiment of this utility model, the diameter of the first gear is larger than the diameter of the second gear, and the rotational speed of the first transmission shaft is lower than the rotational speed of the second transmission shaft.

[0016] In one embodiment of this utility model, a first fixed bearing is installed in the gearbox body, and the end of the first transmission shaft near the volute is installed in the shaft hole of the first fixed bearing.

[0017] In one embodiment of this utility model, a second fixed bearing and a third fixed bearing are installed in the gearbox body, and the two ends of the second transmission shaft are respectively installed in the shaft holes of the second fixed bearing and the third fixed bearing.

[0018] In one embodiment of this utility model, the first thrust disk I and the first thrust disk II respectively form bidirectional thrust bearings with the axial ends of the first adjustable bearing, and the second thrust disk I and the second thrust disk II respectively form bidirectional thrust surfaces with the axial ends of the radial outer side of the first gear.

[0019] In one embodiment of this utility model, the impeller side clearance is controlled at 0.5~0.7mm.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] The impeller side clearance fine adjustment mechanism described in this utility model achieves external fine adjustment of the impeller side clearance through the cooperation of adjustable bearings, connecting parts and adjusting shims. The adjustment can be completed by simply adjusting the thickness of the adjusting shims. This solves the problem that the adjustment of the impeller side clearance usually requires disassembling the gearbox cover, which is cumbersome and difficult to implement in a confined space. It greatly reduces maintenance time and labor costs and improves maintenance efficiency.

[0022] Since the adjustment component of this invention is arranged outside the gearbox, no additional disassembly space is required, and convenient impeller clearance adjustment can be achieved even in space-constrained working conditions. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the impeller side clearance fine adjustment mechanism of this utility model.

[0025] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0026] Explanation of reference numerals on the accompanying drawings:

[0027] 1. Gearbox housing; 2. First drive shaft; 21. First thrust disc I; 22. First thrust disc II; 23. First gear; 3. Adjustable bearing; 31. Adjustment part; 32. First surface;

[0028] 4. Connecting component; 5. Adjusting shim; 6. Fixing screw; 7. Mounting base; 71. Second surface; 72. Mounting part; 73. Connecting part; 74. Adjusting groove; 8. First fixed bearing; 9. Second drive shaft; 10. Second fixed bearing; 11. Third fixed bearing; 12. Volute; 91. Second gear; 92. Second thrust plate I; 93. Second thrust plate II; 94. Impeller; 95. Fastening component. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0030] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0031] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0032] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0033] Reference Figure 1 , Figure 2 As shown, the impeller side clearance fine adjustment mechanism of this utility model includes:

[0034] Gearbox body 1;

[0035] A first transmission assembly, disposed on the gearbox 1, includes a first transmission shaft 2 and a first thrust disc I 21, an adjustable bearing 3, a first thrust disc II 22, and a first gear 23 sequentially disposed on the first transmission shaft 2; wherein, the first adjustable bearing 3 has an axial clearance fit with the first thrust disc I 21 and the first thrust disc II 22, and the adjustable bearing 3 is provided with an adjustment part 31, the adjustment part 31 having a first surface 32; the gap (oil film thickness) between the first thrust disc I 21 and the adjustable bearing 3 is 0.01-0.05mm, and the total gap is 0.15-0.25mm; since the first thrust disc I 21 basically bears all the axial force, the gap at the first thrust disc I 21 is relatively small;

[0036] The adjustment assembly includes a mounting base 7, a connector 4, and an adjustment pad 5 mounted on the gearbox 1. The mounting base 7 has a second surface 71 facing the first surface 32. The connector 4 connects the adjustment part 31 and the mounting base 7 and causes the adjustment pad 5 to abut against the first surface 32 and the second surface 71.

[0037] The second transmission assembly, mounted on the gearbox 1, includes a second transmission shaft 9 and a second thrust disk I 92, a second gear 91, and a second thrust disk II 93 sequentially mounted on the second transmission shaft 9. The first gear 23 has an axial clearance fit with the second thrust disk I 92 and the second thrust disk II 93 at its radially outer end, and the second gear 91 meshes with the first gear 23. The clearance (oil film thickness) between the second thrust disk I 92 and the first gear 23 is 0.01-0.05 mm, and the total clearance is 0.15-0.25 mm. Since the second thrust disk I 92 bears almost all the axial force, the clearance at the second thrust disk I 92 is relatively small.

[0038] The impeller assembly includes a volute 12 and an impeller 94 disposed within the volute 12 and connected to the second drive shaft 9. The impeller 94 is fixedly connected to the second drive shaft 9 by a fastening member 95. The volute 12 forms an impeller side clearance between the impeller 94. The thickness of the adjusting shim 5 is adjusted ( Figure 2 The m in the figure can adjust the impeller side clearance ( Figure 1 The size of X in the equation.

[0039] Adjusting impeller side clearance typically requires disassembling the gearbox cover, which is cumbersome and difficult to perform in confined spaces. This invention achieves external fine-tuning of impeller side clearance through a combination of adjustable bearing 3, connecting piece 4, and adjusting shim 5. Adjustment can be completed simply by adjusting the thickness of adjusting shim 5, significantly reducing maintenance time and labor costs and improving maintenance efficiency.

[0040] Reference Figure 2 As shown, in one embodiment, the adjustment part 31 extends radially outward along the adjustable bearing 3 and forms an annular structure.

[0041] Specifically, the mounting base 7 includes a mounting portion 72 connected to the gearbox body 1 and a connecting portion 73 extending from the mounting portion 72. An adjustment groove 74 is formed between the mounting portion 72, the connecting portion 73, and the gearbox body 1 for the adjustment portion 31 to extend into.

[0042] Specifically, the mounting part 72 abuts against the gearbox body 1 and the two are connected by fixing screws 6.

[0043] The connector 4 includes a fastening screw, which passes through the connector 73 and the adjusting shim 5 in sequence and is threadedly connected to the connector 73.

[0044] In addition, the mounting base 7 consists of a mounting part 72 and a connecting part 73. The mounting part 72 is connected to the gearbox body 1 by fixing screws 6 to ensure the overall structure is stable. At the same time, an adjustment groove 74 is reserved for the adjustment part 31 to extend into, so as to realize flexible adjustment.

[0045] In one embodiment, the diameter of the first gear 23 is larger than the diameter of the second gear 91, and the rotational speed of the first drive shaft 2 is lower than the rotational speed of the second drive shaft 9.

[0046] Specifically, a first fixed bearing 8 is installed (fixed by a slot) inside the gearbox 1, and the end of the first drive shaft 2 near the volute 12 is installed in the shaft hole of the first fixed bearing 8.

[0047] Specifically, a second fixed bearing 10 and a third fixed bearing 11 are installed inside the gearbox 1, and the two ends of the second transmission shaft 9 are respectively installed in the shaft holes of the second fixed bearing 10 and the third fixed bearing 11.

[0048] Specifically, the first thrust disk I 21 and the first thrust disk II 22 are integral with the first transmission shaft 2, and respectively form bidirectional thrust bearings with the axial ends of the first adjustable bearing 3, thereby axially positioning the first transmission shaft 2 and reducing axial movement during operation; the second thrust disk I 92 and the second thrust disk II 93 respectively form bidirectional thrust surfaces with the axial ends of the radial outer side of the first gear 23.

[0049] In one embodiment, the impeller side clearance is controlled at 0.5~0.7mm to improve the working efficiency of the fan.

[0050] The working principle of this embodiment is as follows: Increasing the thickness of the adjusting shim 5 moves the adjustable bearing 3 to the right. Since the direction (to the right) and magnitude of the force on the first drive shaft 2 remain unchanged, the first thrust disc I21 experiences the main axial force during operation. The gap (oil film thickness) between the first thrust disc I21 and the adjustable bearing 3 remains unchanged. The axial force forces the first drive shaft 2 and the first gear 23 to move to the right. Similarly, since the direction (to the right) and magnitude of the force on the second drive shaft 9 remain unchanged, the second thrust disc I92 on the second drive shaft 9 experiences the main axial force. The gap (oil film thickness) between the second thrust disc I92 and the first gear 23 remains unchanged. The axial force forces the second drive shaft 9 and the impeller 94 to move to the right, thereby simultaneously reducing the impeller side clearance. Similarly, decreasing the thickness of the adjusting shim 5 simultaneously increases the impeller side clearance. The above adjustment operation does not require opening the gearbox cover. Simply unscrew the fixing screw 6 from the side, remove the mounting base 7, adjust the thickness of the adjusting shim 5, and then reinstall the mounting base 7. In summary, adjusting the thickness of shim 5 by increasing or decreasing the value by Δ on the original value m will decrease or increase the impeller side clearance by Δ on the original value x, ultimately controlling the impeller side clearance to 0.5~0.7mm, i.e., m±Δ=x∓Δ=0.5~0.7mm. By reasonably controlling the impeller side clearance, the efficient and safe operation of the fan is ensured.

[0051] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A side gap trim mechanism for an impeller, characterized by, The application relates to a gear box, which comprises the following parts: a gear box body (1); a first transmission assembly arranged on the gear box body (1) and comprising a first transmission shaft (2) and a first thrust disc I (21), an adjustable bearing (3), a first thrust disc II (22) and a first gear (23) arranged on the first transmission shaft (2) in sequence; wherein the first adjustable bearing (3) is axially gap-connected with the first thrust disc I (21) and the first thrust disc II (22), the adjustable bearing (3) is provided with an adjusting part (31), and the adjusting part (31) has a first surface (32); an adjusting assembly, which comprises a mounting seat (7) mounted on the gear box body (1), a connecting piece (4) and an adjusting pad (5), the mounting seat (7) has a second surface (71) facing the first surface (32), and the screw (4) connects the adjusting part (31) and the mounting seat (7) and makes the adjusting pad (5) abut tightly between the first surface (32) and the second surface (71); a second transmission assembly arranged on the gear box body (1) and comprising a second transmission shaft (9) and a second thrust disc I (92), a second gear (91) and a second thrust disc II (93) arranged on the second transmission shaft (9) in sequence; wherein the first gear (23) is axially gap-connected with the second thrust disc I (92) and the second thrust disc II (93) at the radially outer side end, and the second gear (91) is engaged with the first gear (23); a vane wheel assembly, which comprises a volute (12) and a vane wheel (94) arranged in the volute (12) and connected with the second transmission shaft (9), and the volute (12) forms a vane wheel side gap between the vane wheel (94), and the size of the vane wheel side gap can be adjusted by adjusting the thickness of the adjusting pad (5).

2. A side gap trim mechanism for an impeller according to claim 1, wherein The adjusting part (31) extends radially outward along the adjustable bearing (3) and forms an annular structure.

3. A side gap trim mechanism for an impeller according to claim 1 or 2, wherein The mounting seat (7) comprises a mounting part (72) connected with the gear box body (1) and a connecting part (73) extending from the mounting part (72), and the mounting part (72) forms an adjusting groove (74) for the adjusting part (31) to extend into between the connecting part (73) and the gear box body (1).

4. A side gap trim mechanism for an impeller according to claim 3, wherein The mounting part (72) abuts against the gear box body (1) and is connected with the gear box body (1) through a fixing screw (6).

5. A side gap trim mechanism for an impeller according to claim 3 wherein, The connecting piece (4) comprises a fastening screw, and the fastening screw is sequentially threaded through the connecting part (73) and the adjusting pad (5) and then is screwed with the connecting part (73).

6. A side gap trim mechanism for an impeller as set forth in claim 1, wherein The diameter of the first gear (23) is larger than that of the second gear (91), and the rotating speed of the first transmission shaft (2) is lower than that of the second transmission shaft (9).

7. A side gap trim mechanism for an impeller as defined in claim 1 wherein, A first fixed bearing (8) is arranged in the gear box body (1), and one end of the first transmission shaft (2) close to the volute (12) is arranged in the shaft hole of the first fixed bearing (8).

8. A side gap trim mechanism for an impeller as set forth in claim 1, wherein The second fixed bearing (10) and the third fixed bearing (11) are installed in the gear box (1), and the two ends of the second transmission shaft (9) are respectively installed in the shaft holes of the second fixed bearing (10) and the third fixed bearing (11).

9. A side gap trim mechanism for an impeller as defined in claim 1, wherein The first thrust disc I (21) and the first thrust disc II (22) form bidirectional thrust bearings with the axial two ends of the first adjustable bearing (3) respectively, and the second thrust disc I (92) and the second thrust disc II (93) form bidirectional thrust surfaces with the axial two ends of the radial outer side of the first gear (23) respectively.

10. A side gap trim mechanism for an impeller as set forth in claim 1, wherein The impeller side gap is controlled to be 0.5-0.7mm.

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