Casing of non-welded centrifugal fan and its production process

Abstract

The present invention discloses a casing of a non-welded centrifugal fan, comprising a front upper side plate, a front lower side plate, a rear upper side plate, a rear lower side plate, an upper volute plate and a lower volute plate, wherein the connection between the front upper side plate and the front lower side plate and the connection between the rear upper side plate and the rear lower side plate are all bent to form an open box flange, the cross section of the open box flange is U-shaped, and two adjacent open box flanges are connected by bolts; the side edges of the upper volute plate and the lower volute plate are bent to form a connecting flange, and the connecting flange is connected to the edges of the front side plate and the rear side plate by bolts, and the connection between the upper volute plate and the lower volute plate is all bent to form a connecting flange, and two adjacent connecting flanges are connected by bolts; the upper volute plate, the front upper side plate and the rear upper side plate are bent corresponding to the outlet of the fan to form an outlet flange, and the cross section of the outlet flange is U-shaped. The present invention can quickly produce the casing by bolting without welding.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal fans, and more particularly to a casing of a non-welded centrifugal fan and a production process thereof. Background Art

[0002] The centrifugal fan casing is an irregular circle (not a perfect circle). Sometimes, for the convenience of maintenance and use, the opening angle is different, the angle of the fan is also different, the casing volute width is different for different models, and the casing size is also different. For fans above No. 12, the traditional practice is to clean the side panels and volutes, and weld the volutes to the side panels along the arc of the side panels. In order to increase the strength of the casing side panels and prevent the side panels from shaking during use, reinforcing ribs are added to the outside of the side panels and welded to the side panels. The opening flange is welded to the opening position, and then the outlet flange is welded to the outlet position.

[0003] The traditional welding forming method has low product consistency and high cost due to the different skills of welding masters, and it is easy for the casing welding to be not strong enough. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method that does not require welding, in which the entire casing is formed into a flange through reasonable bending, and then connected and fixed by bolts, with high production efficiency and a faster assembly process.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a casing of a non-welded centrifugal fan, comprising a front side plate, a rear side plate and a volute, wherein the front side plate comprises a front upper side plate and a front lower side plate; the rear side plate comprises a rear upper side plate and a rear lower side plate; the volute comprises an upper volute and a lower volute, the connection between the front upper side plate and the front lower side plate, and the connection between the rear upper side plate and the rear lower side plate are bent to form an open box flange, the cross section of the open box flange is U-shaped, and two adjacent open box flanges are connected by bolts;

[0006] The side edges of the upper volute and the lower volute are bent to form a connecting flange, and the connecting flange is connected to the edges of the front side plate and the rear side plate by bolts. The connection between the upper volute and the lower volute is bent to form a connecting flange, and two adjacent connecting flanges are connected by bolts.

[0007] The upper volute, the front upper side plate and the rear upper side plate are bent corresponding to the outlet of the fan to form an outlet flange, and the cross section of the outlet flange is U-shaped.

[0008] Furthermore, the front side plate and the rear side plate are both pressed with a well-shaped reinforcement groove.

[0009] Furthermore, the reinforcement groove protrudes outward from the inside of the fan, and the inner sides of the front side plate and the rear side plate are filled with sound-absorbing cotton in the corresponding reinforcement grooves.

[0010] Furthermore, the hole on the handle flange is a waist-shaped hole.

[0011] Furthermore, the reinforcement groove has a depth of 25 mm and a width of 40 mm.

[0012] Furthermore, the connecting flange is located outside the casing.

[0013] A production process for a casing of a non-welded centrifugal fan comprises the following steps:

[0014] S1: Cut the raw material according to the unfolded shapes of the front upper side panel, the front lower side panel, the rear upper side panel and the rear lower side panel, put the raw material on the hydraulic press, press out the reinforcing groove in the shape of a tic-tac-toe, then put the pressed raw material on the laser cutting table for positioning, and cut the connecting holes and the outer edge of the raw material at one time; then use the laser to accurately mark the part to be bent, and fold out the unpacking flange according to the laser marking part, and also fold out the outlet flange of the front upper side panel and the rear upper side panel;

[0015] S2: Cut the clean material according to the unfolded shape of the upper and lower volute plates, accurately mark the parts to be bent with a laser, place the clean material on the laser cutting table for positioning, and complete the cutting of the connecting holes;

[0016] S3: Put the clean material on the bending machine, first fold out the connecting flange, then put it on the rolling machine, use the card to roll out the required arc, and then put it on the bending machine again to fold out the connecting flange. The clean material of the upper volute is also folded out of the outlet flange;

[0017] S4: Install the sound-absorbing cotton in the pressed and formed reinforcement groove;

[0018] S5: Assemble the housing into shape using bolts.

[0019] Further in step S1, the rough material edges of the front upper side panel, the front lower side panel, the rear upper side panel and the rear lower side panel are 30-50 mm larger than the net material thereof.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the entire casing does not need to be welded, and the consistency of the product can be ensured by connecting in sequence through bolts, and the production efficiency is higher, and the U-shaped outlet flange can ensure its structural strength, and the set reinforcement grooves can also make the front side panels and the rear side panels have sufficient strength; its specific production process enables each plate to reach a sufficient size, and since welding is omitted, the bolts passing through the fixed connection holes can ensure the installation accuracy, greatly improving the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural diagram of the casing of the non-welded centrifugal fan of the present invention;

[0022] Figure 2 It is a three-dimensional structural diagram of the front upper side plate of the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0024] Figure 4 This is a three-dimensional structural diagram of the upper snail plate.

[0025] Figure numerals: 1, front side plate; 11, front upper side plate; 111, outlet flange; 112, opening flange; 12, front lower side plate; 13, reinforcement groove; 2, rear side plate; 3, volute; 31, upper volute; 311, connecting flange; 312, connecting flange; 32, lower volute. DETAILED DESCRIPTION

[0026] Reference Figures 1 to 4 The embodiment of the casing of the weld-free centrifugal fan and the production process thereof of the present invention is further described.

[0027] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0029] A casing of a non-welded centrifugal fan, comprising a front side plate 1, a rear side plate 2 and a volute 3, wherein the front side plate 1 comprises a front upper side plate 11 and a front lower side plate 12; the rear side plate 2 comprises a rear upper side plate and a rear lower side plate; the volute 3 comprises an upper volute 31 and a lower volute 32, the connection between the front upper side plate 11 and the front lower side plate 12, and the connection between the rear upper side plate and the rear lower side plate are bent to form an opening flange 112, the cross section of the opening flange 112 is U-shaped, and two adjacent opening flanges 112 are connected by bolts;

[0030] The side edges of the upper volute 31 and the lower volute 32 are bent to form a connecting flange 311, and the connecting flange 311 is connected to the edges of the front side plate 1 and the rear side plate 2 by bolts. The connection between the upper volute 31 and the lower volute 32 is bent to form a connecting flange 312, and two adjacent connecting flanges 312 are connected by bolts.

[0031] The upper volute 31 , the front upper side plate 11 and the rear upper side plate are bent corresponding to the outlet of the fan to form an outlet flange 111 , and the cross section of the outlet flange 111 is U-shaped.

[0032] The connecting flange 311 is in an arc shape as a whole, which is the same as the curvature of the main body of the volute 3 , and is used to connect to the edges of the front side plate 1 and the rear side plate 2 . The connecting flange 312 is used to fix the upper volute 31 and the lower volute 32 to each other.

[0033] like Figure 3 As shown, the U-shaped opening flange 112 and the outlet flange 111 are formed by bending the plate twice, which makes the bending parts have higher strength.

[0034] like Figure 4 As shown, the connecting flange 311 is formed by bending the volute 3 outward, that is, the connecting flange 312 is located on the outside of the casing, and in order to maintain the vertical state of the connecting flange 311 and the main body of the volute 3, during production, the clean material is first placed on a bending machine to fold out the connecting flange 311, and then placed on a rolling machine to roll out the required arc with a card, and then placed on a bending machine to fold out the connecting flange 312, and the clean material of the upper volute 31 is also folded out of the outlet flange 111.

[0035] In this embodiment, connection holes are provided at the connection points connected by bolts.

[0036] To prevent air leakage, sealing gaskets can be arranged at the joints of each plate during assembly.

[0037] In this embodiment, the front side plate 1 and the rear side plate 2 are preferably pressed with a cross-shaped reinforcement groove 13.

[0038] Specifically, the reinforcing groove 13 has a depth of 25 mm and a width of 40 mm, and is used to prevent the flat front side plate 1 and the rear side plate 2 from being deformed due to insufficient strength.

[0039] The preferred reinforcement groove 13 of this embodiment protrudes outward from the inside of the fan, and the inner sides of the front side plate 1 and the rear side plate 2 corresponding to the reinforcement groove 13 are filled with sound-absorbing cotton.

[0040] The hole on the connecting flange 311 of the present embodiment is preferably a waist-shaped hole. Since the upper volute 31 and the lower volute 32 are curved as a whole, the waist-shaped hole can be easily aligned with the connecting holes on the front side plate 1 and the rear side plate 2 by providing the waist-shaped hole.

[0041] A production process for a casing of a non-welded centrifugal fan comprises the following steps:

[0042] S1: Cut the raw material according to the unfolded shapes of the front upper side panel 11, the front lower side panel 12, the rear upper side panel and the rear lower side panel, put the raw material on the hydraulic press to press out the reinforcing groove 13 in the shape of a cross, then put the pressed raw material on the laser cutting table for positioning, and cut the connecting hole and the outer edge of the raw material at one time; then use the laser to accurately mark the part to be bent, and fold out the unpacking flange 112 according to the laser marking part, and also fold out the outlet flange 111 from the front upper side panel 11 and the rear upper side panel;

[0043] The rough material will be deformed during the pressing process, so the material cannot be clean material, and the outer edge should be 30mm-50mm larger than the clean material; after laser cutting, the outer edge size of the rough material is the same as the outer edge size of the clean material; the front side plate 1 needs to consider the air inlet, and the rear side plate 2 needs to consider the connection between the sealing shaft and the rear side plate 2;

[0044] S2: Cut the clean material according to the unfolded shape of the upper volute 31 and the lower volute 32, accurately mark the part to be bent with a laser, place the clean material on the laser cutting table for positioning, and complete the cutting of the connecting hole;

[0045] S3: Put the clean material on the bending machine, first fold out the connecting flange 311, then put it on the rolling machine, use the card plate to roll out the required arc, and then put it on the bending machine again to fold out the connecting flange 312, and the clean material of the upper volute 31 is also folded out the outlet flange 111;

[0046] When the handle flange 311 is folded out, it is vertical. After being put on the rounding machine, the handle flange 311 is kept vertical to the main body, and the handle flange 311 is slightly stretched and deformed. The rounding machine is an intelligent multi-axis rounding machine.

[0047] S4: Install the sound-absorbing cotton in the pressed and formed reinforcement groove 13;

[0048] S5: Assemble the casing into shape with bolts;

[0049] During installation, the four corners of the volute 3 should be connected with reinforcement plates.

[0050] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A casing of a non-welded centrifugal fan, comprising a front side plate, a rear side plate and a volute, wherein the front side plate comprises a front upper side plate and a front lower side plate; the rear side plate comprises a rear upper side plate and a rear lower side plate; the volute comprises an upper volute and a lower volute, characterized in that: The connection between the front upper side plate and the front lower side plate, and the connection between the rear upper side plate and the rear lower side plate are bent to form an opening flange, the cross section of the opening flange is U-shaped, and two adjacent opening flanges are connected by bolts; The side edges of the upper volute and the lower volute are bent to form a connecting flange, and the connecting flange is connected to the edges of the front side plate and the rear side plate by bolts. The connection between the upper volute and the lower volute is bent to form a connecting flange, and two adjacent connecting flanges are connected by bolts. The upper volute, the front upper side plate and the rear upper side plate are bent corresponding to the outlet of the fan to form an outlet flange, and the cross section of the outlet flange is U-shaped; The front side plate and the rear side plate are both pressed with a well-shaped reinforcement groove, and the reinforcement groove protrudes outward from the inside of the fan.

2. The casing of the weld-free centrifugal fan according to claim 1, characterized in that: The hole on the handle flange is a waist-shaped hole.

3. The casing of the weld-free centrifugal fan according to claim 2, characterized in that: The reinforcement groove has a depth of 25 mm and a width of 40 mm.

4. The casing of the weld-free centrifugal fan according to claim 3, characterized in that: The connecting flange is located on the outside of the casing.

5. A process for producing a casing of a welding-free centrifugal fan according to any one of claims 1 to 4, characterized in that: The steps include: S1: Cut the raw material according to the unfolded shapes of the front upper side panel, the front lower side panel, the rear upper side panel and the rear lower side panel, put the raw material on the hydraulic press, press out the reinforcing groove in the shape of a tic-tac-toe, then put the pressed raw material on the laser cutting table for positioning, and cut the connecting holes and the outer edge of the raw material at one time; then use the laser to accurately mark the part to be bent, and fold out the unpacking flange according to the laser marking part, and also fold out the outlet flange of the front upper side panel and the rear upper side panel; S2: Cut the clean material according to the unfolded shape of the upper and lower volute plates, accurately mark the parts to be bent with a laser, place the clean material on the laser cutting table for positioning, and complete the cutting of the connecting holes; S3: Put the clean material on the bending machine, first fold out the connecting flange, then put it on the rolling machine, use the card to roll out the required arc, and then put it on the bending machine again to fold out the connecting flange. The clean material of the upper volute is also folded out of the outlet flange; S4: Install the sound-absorbing cotton in the pressed and formed reinforcement groove; S5: Assemble the housing into shape using bolts.

6. The process for producing a casing of a non-welded centrifugal fan according to claim 5, characterized in that: In step S1, the rough edges of the front upper side panel, the front lower side panel, the rear upper side panel and the rear lower side panel are 30-50 mm larger than the net materials thereof.

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