A welding tool for fan backward-inclined impeller

Abstract

The present invention relates to a welding fixture for a backward-inclined impeller of a fan, comprising an impeller clamping mechanism and an impeller centering mechanism independently arranged from each other, wherein the impeller clamping mechanism comprises a base plate, an impeller support ring arranged on the base plate, a plurality of pressure plates circumferentially arranged above the base plate, and a pressure ring arranged below the pressure plate; the pressure plate is arranged on the base plate via a support and a first fastening bolt; the impeller support ring abuts against the impeller rear disc, and the pressure ring is mounted on the impeller front disc; the impeller centering mechanism comprises a front disc positioning disc mounted on the impeller front disc, a rear disc positioning disc arranged below the front disc positioning disc via a positioning core shaft, and the rear disc positioning disc is fixedly connected to the impeller rear disc. The present invention can achieve the centering of the impeller front disc and the impeller rear disc, and no spot welding operation is required during the impeller assembly process, thereby improving work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of fan impeller welding, and in particular relates to a welding tool for a fan backward-inclined impeller. Background Art

[0002] Backward-inclined impellers are suitable for various large-scale equipment, such as environmental testing machines, constant temperature and humidity machines, frozen food machinery, packaging machinery, etc., especially in places that require high efficiency and low noise, the use of backward-inclined impeller equipment is increasing. The quality of the backward-inclined impeller must be guaranteed during the assembly process. A good fixture is extremely important for the accuracy of welding and the quality of the fan impeller. The backward-inclined impeller fixtures currently on the market usually have the following problems: 1) There is a lack of centering measures. During use, it is difficult to ensure the centering of the impeller front disc and the impeller rear disc; 2) When welding the impeller, tack welding points need to be used for spot fixing. However, the spot fixing process is prone to defects such as cracks and unfused joints. The spot fixing operation is complicated, time-consuming, and has low assembly efficiency; 3) The current backward-inclined impeller fixture cannot solve the problem of easy deformation of the impeller due to stress after welding. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defect of the prior art impeller fixture lacking a centering measure, and to provide a welding fixture for a backward-inclined impeller of a fan.

[0004] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A fan backward-inclined impeller welding tool comprises an impeller clamp mechanism and an impeller centering mechanism which are independently arranged.

[0006] The impeller clamp mechanism includes a base plate, an impeller support ring arranged on the base plate, a plurality of pressure plates arranged circumferentially above the base plate, and a pressure ring arranged below the pressure plate; the pressure plate is arranged on the base plate through a support and a first fastening bolt; the impeller support ring abuts against the impeller rear disc, and the pressure ring is mounted on the impeller front disc;

[0007] The impeller centering mechanism includes a front disc positioning plate mounted on the impeller front disc, a rear disc positioning plate arranged below the front disc positioning plate via a positioning core shaft, and the rear disc positioning plate is fixedly connected to the impeller rear disc.

[0008] Furthermore, the bottom plate is provided with a first through hole, and a strip hole is provided on the pressure plate at a position corresponding to the through hole, and one end of the first fastening bolt passes through the first through hole and the strip hole and then a compression nut is provided;

[0009] The bottom of the support is fixedly connected to the bottom plate, and the top is in contact with the pressing plate; or the top of the support is fixedly connected to the pressing plate, and the bottom is in contact with the bottom plate.

[0010] Furthermore, the impeller front disc includes an annular horizontal plate and an annular vertical plate connected by an arc angle, and the pressure ring is arranged above the annular horizontal plate;

[0011] The impeller rear disc includes an annular top plate and an annular inclined plate that are integrally connected. The rear disc positioning plate is arranged below the annular top plate and is fixedly connected to the annular top plate by bolts; the impeller support ring is arranged below the annular inclined plate and abuts against the middle part of the annular inclined plate. A first gap is provided between the lower edge of the annular inclined plate and the bottom plate.

[0012] Furthermore, an annular positioning groove is provided at the bottom of the outer ring wall of the front plate positioning plate, and the top of the annular vertical plate is provided in the annular positioning groove and matched with the annular positioning groove.

[0013] Furthermore, an axial hole is provided at the center of the impeller rear disc, and a positioning protrusion is provided at one end of the rear disc positioning disc close to the impeller rear disc. The positioning protrusion is inserted into the axial hole and matched with the axial hole.

[0014] Furthermore, a second through hole is provided at the center of the front disc positioning disc, a third through hole is provided at the center of the rear disc positioning disc, the positioning core shaft includes a second fastening bolt inserted into the third through hole and fixedly connected to the third through hole, and a fastening nut is provided after the front end of the second fastening bolt passes through the shaft hole and the second through hole.

[0015] Furthermore, a gasket is sleeved on the second fastening bolt, and the gasket is arranged between the front disc positioning plate and the fastening nut.

[0016] Furthermore, an annular groove is provided at the upper portion of the third through hole, thereby forming a boss on the side wall of the third through hole; the inner diameter of the gasket is smaller than the inner diameter of the second through hole; a sleeve is provided on the outer sleeve of the second fastening bolt, and two ends of the sleeve are respectively provided in the second through hole and the third through hole; a second gap is provided between the sleeve and the gasket and / or the boss;

[0017] Furthermore, a plurality of universal balls are provided on the front disc positioning disc and the bottom plate.

[0018] Furthermore, a plurality of inverted L-shaped centering blocks are provided along the circumference of the outer side wall of the pressure ring, and the outer wall of the annular transverse plate abuts against the vertical parts of the inverted L-shaped centering blocks.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention realizes the alignment of the impeller front disc and the impeller rear disc during the impeller assembly process through the impeller centering mechanism. The impeller centering mechanism of the present invention is composed of the front disc positioning disc, the positioning core shaft and the rear disc positioning disc, so that it is independently arranged with the impeller clamp mechanism, simplifies the assembly operation of the impeller and improves the assembly efficiency of the impeller. The present invention constrains the impeller front disc and the impeller rear disc by the second fastening bolt, eliminating the need for spot welding operations. Compared with the traditional spot welding method, the assembly is simpler and more effective. The present invention provides a pressure ring under the pressure plate, which transmits the fastening pressure to the impeller through the pressure ring, so that the impeller is compressed while ensuring uniform force, which not only reduces the problem of impeller welding deformation, but also avoids the generation of indentations on the impeller. The front disc positioning disc and the bottom plate of the present invention are provided with universal ball bearings, so that the welding tool of the present invention can slide freely on the operating platform, thereby facilitating the welding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of an embodiment of the present invention (with a backward-inclined impeller);

[0022] Figure 2 This is a schematic structural diagram of an embodiment of the present invention (with a backward-inclined impeller);

[0023] Figure 3 This is a schematic structural diagram of an embodiment of the present invention (without a backward-inclined impeller);

[0024] Figure 4 A perspective view of a backward-inclined impeller in one embodiment of the present invention;

[0025] Figure 5 An exploded view of a backward-inclined impeller in one embodiment of the present invention;

[0026] Figure 6 A three-dimensional diagram of an impeller centering mechanism according to an embodiment of the present invention;

[0027] Figure 7 A three-dimensional diagram of an impeller clamp mechanism according to one embodiment of the present invention;

[0028] Figure 8 This is a structural diagram of another embodiment of the present invention (with a backward-inclined impeller);

[0029] In the figure: 1. impeller clamp mechanism, 2. impeller centering mechanism, 3. bottom plate, 4. support ring, 5. pressure plate, 6. pressure ring; 7. pillar, 8. first fastening bolt, 9. impeller rear disc, 10. impeller front disc, 11. front disc positioning disc, 12. blade, 13. rear disc positioning disc, 14. strip hole, 15. tightening nut, 16. arc angle, 17. annular horizontal plate, 18. annular vertical plate, 19. sleeve, 20. annular top plate, 21. annular inclined plate, 22. first gap, 23. annular positioning groove, 24. shaft hole, 25. positioning protrusion, 26. third through hole, 27. second fastening bolt, 28. fastening nut, 29. gasket, 30. boss; 31. second gap; 32. universal ball, 33. inverted L-shaped centering block, 34. plug block, 35. slot. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0033] The present invention will be described in further detail below with reference to the accompanying drawings.

[0034] like Figure 4-5The backward-inclined impeller shown includes an impeller front disc 10, an impeller rear disc 9, and a plurality of blades 12 uniformly arranged along the circumference between the impeller front disc 10 and the impeller rear disc 9. Inserts 34 are provided at both the front and rear ends of the blades 12. Slots 35 are provided on the impeller front disc 10 and the impeller rear disc 9, and the inserts 34 engage with the corresponding slots 35.

[0035] Furthermore, the impeller front disc 10 includes an annular horizontal plate 17 and an annular vertical plate 18 connected by an arc angle 16; the impeller rear disc 9 includes an annular top plate 20 and an annular inclined plate 21 connected as one piece, and an axial hole 24 is provided at the center of the impeller rear disc 9.

[0036] like Figures 1-3 6-7, an embodiment of a backward-inclined impeller welding tool of the present invention comprises an impeller clamp mechanism 1 and an impeller centering mechanism 2 which are independently arranged.

[0037] The impeller clamp mechanism 1 includes a base plate 3, an impeller support ring 4 disposed on the base plate 3, a plurality of pressure plates 5 circumferentially disposed above the base plate 3, and a pressure ring 6 disposed below the pressure plates 5; the pressure plates 5 are mounted on the base plate 3 via struts 7 and first fastening bolts 8; the impeller support ring 4 abuts against the impeller rear disc 9, and the pressure ring 6 is mounted on the impeller front disc 10;

[0038] The impeller centering mechanism 2 includes a front disc positioning plate 11 mounted on the impeller front disc 10, and a rear disc positioning plate 13 disposed below the front disc positioning plate 11 via a positioning core shaft. The rear disc positioning plate 13 is fixedly connected to the impeller rear disc 9. The present invention uses an impeller centering mechanism to achieve the centering of the impeller front disc 10 and the impeller rear disc 9 during the impeller assembly process. The impeller centering mechanism of the present invention is composed of the front disc positioning plate 11, the positioning core shaft, and the rear disc positioning plate 13, so that it is independently arranged from the impeller clamp mechanism 1, simplifying the impeller assembly operation and improving the impeller assembly efficiency. The present invention provides a pressure ring 6 below the pressure plate 5, and transmits the tightening pressure to the impeller through the pressure ring 6, so that the impeller is compressed while ensuring uniform force, which not only reduces the problem of impeller welding deformation, but also avoids the formation of indentations on the impeller.

[0039] Furthermore, the impeller centering mechanism 2 adopted in the present invention, the connection surfaces between the front disc positioning disc 11 and the impeller front disc 10, the rear disc positioning disc 13 and the impeller rear disc 9 and the positioning core shaft can all be machined, thereby improving the connection accuracy and ensuring the centering effect.

[0040] As an embodiment of a welding fixture for a backward-inclined impeller of a fan according to the present invention, a first through hole is provided on the base plate 3, a strip hole 14 is provided on the pressure plate 5 at a position corresponding to the through hole, one end of the first fastening bolt 8 passes through the first through hole and the strip hole 14, and a clamping nut 15 is provided thereafter;

[0041] The bottom of the support 7 is fixedly connected to the bottom plate 3, and the top is in contact with the pressure plate 5; or the top of the support 7 is fixedly connected to the pressure plate 5, and the bottom is in contact with the bottom plate 3. The present invention constrains the impeller front disc 10 and the impeller rear disc 9 by tightening bolts, and then performs the impeller welding operation, which eliminates the need for spot welding operations. Compared with the traditional spot welding method, the assembly is simpler and more effective.

[0042] As an embodiment of a welding fixture for a backward-inclined impeller of a fan according to the present invention, the pressure ring 6 is arranged above the annular horizontal plate 17;

[0043] The rear disc positioning disc 13 is arranged below the annular top plate 20 and is fixedly connected to the annular top plate 20 by bolts; the impeller support ring 4 is arranged below the annular inclined plate 21 and abuts against the middle part of the annular inclined plate 21, and a first gap 22 is provided between the lower edge of the annular inclined plate 21 and the bottom plate 3.

[0044] As an embodiment of a welding tool for a backward-inclined impeller of a fan according to the present invention, an annular positioning groove 23 is provided at the bottom of the outer ring wall of the front disc positioning plate 11, and the top of the annular vertical plate 18 is provided in the annular positioning groove 23 and cooperates with the annular positioning groove 23;

[0045] An axial hole 24 is provided at the center of the impeller rear disc 9 , and a positioning protrusion 25 is provided at one end of the rear disc positioning disc 13 close to the impeller rear disc 9 . The positioning protrusion 25 is inserted into the axial hole 24 and cooperates with the axial hole 24 .

[0046] As an embodiment of a welding tool for a backward-inclined impeller of a fan according to the present invention, a second through hole is provided at the center of the front disc positioning disc 11, and a third through hole 26 is provided at the center of the rear disc positioning disc 13. The positioning core shaft includes a second fastening bolt 27 inserted into the third through hole 26 and fixedly connected to the third through hole 26. A fastening nut 28 is provided after the front end of the second fastening bolt 27 passes through the shaft hole 24 and the second through hole.

[0047] Furthermore, a washer 29 is sleeved on the second fastening bolt 27 , and the washer 29 is disposed between the front disc positioning plate 11 and the fastening nut 28 .

[0048] Furthermore, an annular groove is provided at the upper portion of the third through hole 26, thereby forming a boss 30 on the side wall of the third through hole; the inner diameter of the gasket 29 is smaller than the inner diameter of the second through hole; a sleeve 19 is provided on the outer sleeve of the second fastening bolt 27, and the two ends of the sleeve 19 are respectively provided in the second through hole and the third through hole 26; a second gap 31 is provided between the sleeve 19 and the gasket 29 and / or the boss 30.

[0049] As one embodiment of the welding fixture for a backward-inclined impeller of a fan according to the present invention, a plurality of universal ball bearings 32 are provided on both the front disc positioning plate 11 and the base plate 3. The provision of universal ball bearings 32 on the front disc positioning plate 11 and the base plate 3 allows the welding fixture to slide freely on the operating platform, facilitating welding operations.

[0050] As an embodiment of a fan backward-inclined impeller welding tool of the present invention, Figure 8 As shown, the outer wall of the pressure ring 6 is circumferentially provided with a plurality of inverted L-shaped centering blocks 33, and the outer wall of the annular transverse plate 17 abuts against the vertical portions of the inverted L-shaped centering blocks 33. The provision of the L-shaped centering blocks ensures the alignment of the pressure ring 6 and the front disc positioning plate 11, thereby preventing uneven force on the impeller and the formation of indentations caused by the deviation of the pressure ring 6.

[0051] The method of using the present invention:

[0052] Step 1. First, insert the protrusion of the rear disc positioning plate 13 into the shaft hole 24 of the impeller rear disc 9, and then fix the impeller rear disc 9 and the rear disc positioning plate 13 with bolts, then insert the insert block 34 of the blade 12 into the slot 35 of the impeller rear disc 9 to achieve the clamping connection between the blade 12 and the impeller rear disc 9, then insert the sleeve 19 of the positioning core shaft and the second fastening bolt 27 into the third through hole 26 of the rear disc positioning plate 13, and fix the second fastening bolt 27 to the rear disc positioning plate 13, then clamp the top of the impeller front disc 10 into the annular positioning groove 23 on the edge of the front disc positioning plate 11, and then pass the front end of the second fastening bolt 27 through the front disc positioning plate 11 and the gasket 29 and pre-tighten it with the fastening nut 28.

[0053] Step 2: Align the insert 34 of the blade 12 with the slot 35 of the impeller front disk 10, and tighten the fastening nut 28 to complete the assembly of the impeller. The assembly efficiency is high and no spot fixing process of the blade 12 welding point is required.

[0054] Step 3: Place the impeller on the support ring 4, place the pressure ring 6 on the impeller, slide the pressure plate 5 so that the pressure plate 5 presses the pressure ring 6, and tighten the first fastening bolt 8 to complete the clamping and fixing of the impeller.

[0055] Step 4: Slide the welding tool, adjust the welding angle, and then start welding.

[0056] The above-described embodiments are only preferred embodiments of the present invention and are not exhaustive of all feasible implementations of the present invention. For those skilled in the art, any obvious modifications made thereto without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims of the present invention.

Claims

1. A welding tool for a backward-inclined impeller of a fan, characterized in that: Used for welding and fixing a backward-inclined impeller of a fan; the backward-inclined impeller of the fan comprises an impeller front disc (10), an impeller rear disc (9), and a plurality of blades (12) uniformly arranged along the circumference between the impeller front disc (10) and the impeller rear disc (9); plug-ins (34) are provided at both the front and rear ends of the blades (12); slots (35) are provided on the impeller front disc (10) and the impeller rear disc (9); the plug-ins (34) are engaged with the corresponding slots (35); the backward-inclined impeller welding tool comprises an impeller clamp mechanism (1) and an impeller centering mechanism (2) which are independently arranged. The impeller clamp mechanism (1) comprises a base plate (3), an impeller support ring (4) arranged on the base plate (3), a plurality of pressure plates (5) circumferentially arranged above the base plate (3), and a pressure ring (6) arranged below the pressure plate (5); the pressure plate (5) is arranged on the base plate (3) through a support (7) and a first fastening bolt (8); the impeller support ring (4) is in contact with the impeller rear disc (9), and the pressure ring (6) is mounted on the impeller front disc (10); The impeller centering mechanism (2) comprises a front disc positioning plate (11) mounted on the impeller front disc (10), a rear disc positioning plate (13) arranged below the front disc positioning plate (11) via a positioning core shaft, and the rear disc positioning plate (13) is fixedly connected to the impeller rear disc (9); The center of the impeller rear disc (9) is provided with an axial hole (24). A second through hole is provided at the center of the front disc positioning disc (11), a third through hole (26) is provided at the center of the rear disc positioning disc (13), the positioning core shaft includes a second fastening bolt (27) inserted into the third through hole (26) and fixedly connected to the third through hole (26), and a fastening nut (28) is provided after the front end of the second fastening bolt (27) passes through the shaft hole (24) and the second through hole; The impeller front disc (10) comprises an annular horizontal plate (17) and an annular vertical plate (18) connected by an arc angle (16), and the pressure ring (6) is arranged above the annular horizontal plate (17); An annular positioning groove (23) is provided at the bottom of the outer ring wall of the front disc positioning disc (11), and the top of the annular vertical plate (18) is arranged in the annular positioning groove (23) and matched with the annular positioning groove (23).

2. A fan backward-inclined impeller welding tool according to claim 1, characterized in that: A first through hole is provided on the bottom plate (3), a strip hole (14) is provided on the pressure plate (5) at a position corresponding to the through hole, and a clamping nut (15) is provided after one end of the first fastening bolt (8) passes through the first through hole and the strip hole (14); The bottom of the support (7) is fixedly connected to the bottom plate (3), and the top abuts against the pressure plate (5); or the top of the support (7) is fixedly connected to the pressure plate (5), and the bottom abuts against the bottom plate (3).

3. The backward-inclined impeller welding tool for a fan according to claim 1, characterized in that: The impeller rear disc (9) comprises an annular top plate (20) and an annular inclined plate (21) connected in one piece; the rear disc positioning disc (13) is arranged below the annular top plate (20) and is fixedly connected to the annular top plate (20) by bolts; the impeller support ring (4) is arranged below the annular inclined plate (21) and abuts against the middle of the annular inclined plate (21); a first gap (22) is provided between the lower edge of the annular inclined plate (21) and the bottom plate (3).

4. A fan backward-inclined impeller welding tool according to claim 3, characterized in that: A positioning protrusion (25) is provided at one end of the rear disc positioning disc (13) close to the impeller rear disc (9); the positioning protrusion (25) is inserted into the shaft hole (24) and matched with the shaft hole (24).

5. The backward-inclined impeller welding tool for a fan according to claim 1, characterized in that: A washer (29) is also sleeved on the second fastening bolt (27), and the washer (29) is arranged between the front disc positioning disc (11) and the fastening nut (28).

6. A fan backward-inclined impeller welding tool according to claim 5, characterized in that: An annular groove is provided at the upper portion of the third through hole (26), thereby forming a boss (30) on the side wall of the third through hole; the inner diameter of the gasket (29) is smaller than the inner diameter of the second through hole; a sleeve (19) is provided on the outer sleeve of the second fastening bolt (27), and two ends of the sleeve (19) are respectively provided in the second through hole and the third through hole (26); a second gap (31) is provided between the sleeve (19) and the gasket (29) and / or the boss (30).

7. The backward-inclined impeller welding tool for a fan according to claim 1, characterized in that: A plurality of universal balls (32) are provided on the front disc positioning disc (11) and the bottom plate (3).

8. The backward-inclined impeller welding tool for a fan according to claim 1, characterized in that: A plurality of inverted L-shaped centering blocks (33) are provided along the circumference of the outer side wall of the pressure ring (6), and the outer wall of the annular transverse plate (17) abuts against the vertical portions of the inverted L-shaped centering blocks (33).

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