A reference positioning tool for a single-stage centrifugal fan outlet guide vane

Abstract

This utility model relates to a reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan. The utility model includes a positioning base, the bottom surface of which can be supported on an arc-shaped step and has a second alignment line along its center suitable for alignment with a first alignment line. One side end face of the positioning base has a second arc suitable for close contact with the first arc. The upper end face of the positioning base has a guide groove. A positioning block includes a guide portion that movably engages with the guide groove and a positioning portion connected to the guide portion. The positioning portion has a profiled surface suitable for close contact with the profile of the positioning section. A clamping member is disposed between the guide portion and the bottom wall of the guide groove to press the guide portion onto the positioning base when it moves to a predetermined position within the guide groove. A support plate is connected to the other end face of the positioning base. A support member is disposed on the support plate and abuts against the side end of the guide portion. This utility model improves the positioning accuracy, installation consistency, and applicability of the fan outlet guide vane.

Description

Technical Field

[0001] This utility model relates to the field of single-stage centrifugal fan technology, and in particular to a reference positioning tool for the outlet guide vane of a single-stage centrifugal fan. Background Technology

[0002] In existing technologies, the outlet guide vanes of a single-stage centrifugal fan typically consist of 11 circumferentially distributed blades. To ensure consistent and repeatable fan performance, these blades must be positioned at a uniform reference point during installation. To guarantee the accuracy of this reference positioning, a template is usually used to locate the blades. This involves machining holes on the template that match the shape and arrangement of the 11 blades, and then fitting each blade into the corresponding hole on the template for positioning. However, due to accumulated machining errors, the blade holes on the template must be much larger than the blades to ensure that all blades fit into the holes. This positioning method is not only inaccurate but also not universally applicable, making it particularly inconvenient for field maintenance and large-scale products due to their size and weight. Summary of the Invention

[0003] To address this issue, this utility model provides a reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan, which improves the positioning accuracy, installation consistency, and applicability of the fan outlet guide vane, and overcomes the problems of low accuracy, poor applicability, and inconvenience for on-site maintenance of existing template positioning methods.

[0004] To solve the above technical problems, this utility model provides a reference positioning tool for the outlet guide vane of a single-stage centrifugal fan. The single-stage centrifugal fan includes a diffuser seat and multiple blades circumferentially distributed on the diffuser seat, one of which is a main blade. The main blade includes a positioning section profile. The outer peripheral end of the diffuser seat is provided with an arc-shaped step with a first arc. The outer end of the arc-shaped step is provided with a first alignment line.

[0005] The reference positioning fixture includes:

[0006] The positioning seat has a bottom end face that can be supported on the arc-shaped step and a second alignment line that is suitable for aligning with the first alignment line is provided along the middle. A second arc that is suitable for closely fitting the first arc is provided on one side end face of the positioning seat. A guide groove is provided on the upper end face of the positioning seat.

[0007] The positioning block includes a guide portion that movably engages with the guide groove and a positioning portion connected to the guide portion. The positioning portion is provided with a profile surface suitable for closely adhering to the profile of the positioning segment.

[0008] A clamping element is disposed between the guide portion and the bottom wall of the guide groove to clamp the guide portion onto the positioning seat when the guide portion moves to a predetermined position in the guide groove.

[0009] The support plate is connected to the other end face of the positioning seat;

[0010] A support member is disposed on the support plate and abuts against the side end of the guide portion.

[0011] In one embodiment of this utility model, the upper end face of the positioning seat is provided with a first through hole on both sides of the guide groove, and the upper end face of the arc-shaped step is provided with a first screw hole corresponding to the first through hole, and a connecting screw is fitted between the first through hole and the first screw hole.

[0012] In one embodiment of this utility model, the support member includes a support screw, which is screwed into a threaded through hole in the middle of the outer end face of the support plate and abuts against the side end face of the guide portion.

[0013] In one embodiment of this utility model, a second through hole is provided on the side end face of the support plate at the position on both sides of the support member, and a second screw hole is provided on the other side end face of the positioning seat corresponding to the second through hole, and a fastening screw is fitted between the second through hole and the second screw hole.

[0014] In one embodiment of this utility model, the guide portion is provided with an oblong through hole, the upper end face of the positioning seat is provided with a third screw hole, and the clamping member includes a clamping screw connected between the oblong through hole and the third screw hole.

[0015] In one embodiment of this utility model, after the positioning seat is positioned and connected to the positioning block, a gap is left between the end of the positioning part near the guide part and the positioning seat.

[0016] In one embodiment of this utility model, the guide portion and the guide groove are in clearance fit and a sliding pair is formed between them.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0018] The reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan described in this utility model is composed of components such as a positioning seat, a positioning block, and a support plate. It has a compact structure, is easy to manufacture and assemble, has a light overall weight, and is applicable to a wide range of applications.

[0019] This invention ensures the uniform installation position of the remaining blades by only needing to accurately locate the main blades, making it applicable to fans of different specifications and improving its versatility. It is especially advantageous in maintenance sites and for large-scale fans. Attached Figure Description

[0020] 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.

[0021] Figure 1A This is the main view of the assembly structure of the reference positioning tooling of this utility model.

[0022] Figure 1B for Figure 1A A cross-sectional view along the AA direction.

[0023] Figure 1C This is a front view of the positioning seat in this utility model.

[0024] Figure 1D for Figure 1C A cross-sectional view along the AA direction.

[0025] Figure 1E This is the front view of the positioning block in this utility model.

[0026] Figure 1F for Figure 1E A view facing K.

[0027] Figure 2A This is a front view of the structure showing the reference positions of the diffuser base and blades.

[0028] Figure 2B for Figure 2A A cross-sectional view along the AA direction.

[0029] Figure 3A This is the main structural view of the reference positioning tooling application of this utility model.

[0030] Figure 3B for Figure 3A A cross-sectional view along the AA direction.

[0031] Explanation of reference numerals in the instruction manual:

[0032] 0. Diffuser seat; 00. First alignment line; 01. First arc; 02. First screw hole; 03. Arc-shaped step; 001. Main blade; 002. Positioning section profile;

[0033] 1. Positioning seat; 10. Second alignment line; 11. Second arc; 12. First through hole; 13. Second screw hole; 14. Third screw hole; 15. Guide groove;

[0034] 2. Positioning block; 21. Guide section; 22. Profiled surface; 23. Waist-shaped through hole; 24. Positioning section;

[0035] 3. Support plate;

[0036] 4. Tighten the screws;

[0037] 5. Support components;

[0038] 6. Clamping components;

[0039] 7. Connecting screws. Detailed Implementation

[0040] 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 are not intended to limit the present invention.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Reference Figures 1A to 2B As shown, this utility model discloses a reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan. The single-stage centrifugal fan includes a diffuser seat 0 and multiple blades circumferentially distributed on the diffuser seat 0. One of the blades is a main blade 001. The main blade 001 includes a positioning section profile 002. An arc-shaped step 03 with a first arc 01 is provided at the outer peripheral end of the diffuser seat 0. A first alignment line 00 is provided at the outer end of the arc-shaped step 03.

[0045] The reference positioning fixture includes:

[0046] The positioning seat 1 has a bottom end face that can be supported on the arc-shaped step 03 and a second alignment line 10 that is suitable for aligning with the first alignment line 00 is provided along the middle. A second arc 11 that is suitable for closely abutting the first arc 01 is provided on one side end face of the positioning seat 1. A guide groove 15 is provided on the upper end face of the positioning seat 1.

[0047] The positioning block 2 includes a guide part 21 that is movably engaged with the guide groove 15 and a positioning part 24 connected to the guide part 21. The positioning part 24 is provided with a profile surface 22 that is suitable for closely adhering to the positioning section profile 002.

[0048] A clamping member 6 is disposed between the guide portion 21 and the bottom wall of the guide groove 15 to clamp the guide portion 21 onto the positioning seat 1 when the guide portion 21 moves to a predetermined position in the guide groove 15.

[0049] The support plate 3 is connected to the other end face of the positioning seat 1;

[0050] The support member 5 is disposed on the support plate 3 and abuts against the side end of the guide portion 21.

[0051] In one embodiment, refer to Figure 1C , Figure 2A , Figure 3A As shown, the upper end face of the positioning seat 1 is provided with a first through hole 12 on both sides of the guide groove 15, and the upper end face of the arc-shaped step 03 is provided with a first screw hole 02 corresponding to the first through hole 12. A connecting screw 7 is fitted between the first through hole 12 and the first screw hole 02.

[0052] In one embodiment, refer to Figure 1A As shown, the support member 5 includes a support screw, which is screwed into a threaded through hole in the middle of the outer end face of the support plate 3 and abuts against the side end face of the guide portion 21.

[0053] In one embodiment, refer to Figure 1A , Figure 1C As shown, a second through hole is provided on the side end face of the support plate 3 at the position on both sides of the support member 5, and a second screw hole 13 is provided on the other side end face of the positioning seat 1 corresponding to the second through hole. A fastening screw 4 is provided between the second through hole and the second screw hole 13.

[0054] In one embodiment, refer to Figure 1D , Figure 1E , Figure 1FAs shown, the guide portion 21 is provided with an oblong through hole 23, the upper end face of the positioning seat 1 is provided with a third screw hole 14, and the clamping member 6 includes a clamping screw connected between the oblong through hole 23 and the third screw hole 14. By using the oblong through hole 23 in conjunction with the clamping screw for adjustment, the positioning is made more stable.

[0055] In one embodiment, refer to Figure 1A As shown, after the positioning seat 1 and the positioning block 2 are positioned and connected, a gap x is left between the end of the positioning part 24 near the guide part 21 and the positioning seat 1 to prevent it from jamming.

[0056] In one embodiment, refer to Figure 1C , Figure 1E As shown, the width of the guide part 21 is n, and the width of the guide groove 15 is m, where m is slightly larger than n, so that the guide part 21 and the guide groove 15 can fit together with a small gap and form a sliding pair between them.

[0057] It should be noted that in the outlet guide vane system of a single-stage centrifugal fan, each blade has its own rotation axis (oscillation axis). Existing blade synchronization adjustment mechanisms can be used to synchronize these blades. That is, when the main blade 001 rotates through an angle, the other blades will also change by the same angle. One blade serves as the main blade 001, with a drive device installed at its shaft end; the remaining blades are auxiliary blades. Since the movement of all auxiliary blades is driven by the main blade 001 (and its connection to the synchronization mechanism), as long as the angle of the main blade 001 is fixed, the other auxiliary blades will also lock to the corresponding angle. An indicator is installed on the drive device to display the current angle. When the main blade 001 is at a certain reference position, the indicator shows zero, and the other auxiliary blades are also at zero. After removing the reference positioning fixture, in subsequent operations, as the drive device rotates, the indicator displays the corresponding rotation angle value. The blade synchronization adjustment mechanism can simultaneously drive the other auxiliary blades to rotate through the same angle, allowing all blades to be adjusted synchronously.

[0058] Reference Figure 3A , Figure 3B As shown, when using this utility model, the second arc 11 of the positioning seat 1 is pressed against the first arc 01 of the diffuser seat 0, and the second alignment line 10 of the bottom end face of the positioning seat 1 is aligned with the first alignment line 00 on the diffuser seat 0. The positioning seat 1 is fixed on the diffuser seat 0 by the connecting screw 7 (two first screw holes 02 are preset on the diffuser seat 0), so that the profile surface 22 of the positioning block 2 is close to the positioning section profile 002 on the main blade 001. The support member 5 (support screw) is turned to press against the positioning block 2 (do not use too much force to damage the blade). The clamping member 6 (clamping screw) is tightened to completely fix the positioning block 2.

[0059] Subsequently, install all blades and blade synchronization adjustment mechanisms, then install the diffuser seat 0 together with the blade synchronization adjustment mechanism on the gearbox. Connect the drive device to the main blade 001 and fix the drive device on the gearbox. Adjust the indicator position so that the blade reference is the same as the reference on the indicator. At this time, the blade reference positioning installation is completed, and the reference positioning fixture is removed.

[0060] 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 reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan, the single-stage centrifugal fan including a diffuser seat (0) and a plurality of blades circumferentially distributed on the diffuser seat (0), one of which is a main blade (001), the main blade (001) including a positioning section profile (002), the outer peripheral end of the diffuser seat (0) is provided with an arc-shaped step (03) having a first arc (01), and the outer end of the arc-shaped step (03) is provided with a first alignment line (00); Its features are, The reference positioning fixture includes: The positioning seat (1) has a bottom end face that can be supported on the arc-shaped step (03) and a second alignment line (10) that is suitable for aligning with the first alignment line (00) is provided along the middle. A second arc (11) that is suitable for closely adhering to the first arc (01) is provided on one side end face of the positioning seat (1). A guide groove (15) is provided on the upper end face of the positioning seat (1). The positioning block (2) includes a guide part (21) that is movably engaged with the guide groove (15) and a positioning part (24) connected to the guide part (21). The positioning part (24) is provided with a profile surface (22) suitable for closely adhering to the positioning section profile (002). A clamping member (6) is disposed between the guide portion (21) and the bottom wall of the guide groove (15) to clamp the guide portion (21) onto the positioning seat (1) when the guide portion (21) moves to a predetermined position in the guide groove (15); The support plate (3) is connected to the other end face of the positioning seat (1); The support member (5) is disposed on the support plate (3) and abuts against the side end of the guide part (21).

2. The reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan according to claim 1, characterized in that, The upper end face of the positioning seat (1) is provided with a first through hole (12) on both sides of the guide groove (15), and the upper end face of the arc step (03) is provided with a first screw hole (02) corresponding to the first through hole (12). A connecting screw (7) is fitted between the first through hole (12) and the first screw hole (02).

3. The reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan according to claim 1, characterized in that, The support member (5) includes a support screw, which is screwed into a threaded through hole in the middle of the outer end face of the support plate (3) and abuts against the side end face of the guide part (21).

4. The reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan according to claim 1, characterized in that, The support plate (3) has a second through hole on its side end face located on both sides of the support member (5). The other side end face of the positioning seat (1) has a second screw hole (13) corresponding to the second through hole. A fastening screw (4) is fitted between the second through hole and the second screw hole (13).

5. The reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan according to claim 1, characterized in that, The guide part (21) is provided with a waist-shaped through hole (23), the upper end face of the positioning seat (1) is provided with a third screw hole (14), and the clamping member (6) includes a clamping screw connected between the waist-shaped through hole (23) and the third screw hole (14).

6. The reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan according to claim 1, characterized in that, After the positioning seat (1) is positioned and connected to the positioning block (2), a gap is left between the end of the positioning part (24) near the guide part (21) and the positioning seat (1).

7. The reference positioning fixture for the outlet guide vane of a single-stage centrifugal fan according to claim 1, characterized in that, The guide portion (21) and the guide groove (15) are in clearance fit and form a sliding pair between them.

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