CN114871706A - Connecting method of explosion-proof device of air inlet of centrifugal fan - Google Patents
Connecting method of explosion-proof device of air inlet of centrifugal fan Download PDFInfo
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- CN114871706A CN114871706A CN202210627619.XA CN202210627619A CN114871706A CN 114871706 A CN114871706 A CN 114871706A CN 202210627619 A CN202210627619 A CN 202210627619A CN 114871706 A CN114871706 A CN 114871706A
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- explosion
- arc
- cylinder
- welding
- flange plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
Abstract
The invention relates to a connecting method of an explosion-proof device at an air inlet of a centrifugal fan, which comprises the following steps: firstly, blanking a proper steel plate material and then rolling the steel plate material by using a plate rolling machine to obtain a conical cylinder, an arc cylinder and an explosion-proof ring; spinning the arc-shaped cylinder and the explosion-proof ring by using a spinning machine; placing the conical cylinder on the platform, respectively fixing one end of a first flange plate and one end of a second flange plate on the conical cylinder, fixedly connecting the other end of the first flange plate with a fan pipeline, fixedly connecting the other end of the second flange plate with a fan shell, and arranging reinforcing ribs between the first flange plate and the second flange plate; one end of the arc-shaped cylinder is welded with one end of the conical cylinder; the other end of the arc-shaped cylinder is welded with one end of the explosion-proof ring. The arc-shaped cylinder and the explosion-proof ring are connected by adopting a welding processing method, and the welding difficulty is high due to the low melting point of copper, but the welded arc-shaped cylinder is firmer and more durable, and the appearance is attractive.
Description
Technical Field
The invention relates to the technical field of ventilation equipment, in particular to a connecting method of an explosion-proof device at an air inlet of a centrifugal fan.
Background
The centrifugal fan is industrial equipment which conveys gas through rotation of an impeller and a main shaft, more and more gas conveyed in multiple projects contains flammable and explosive media, and users need to design a structure capable of preventing explosion and static spark at an air inlet of the centrifugal fan. The matching part of the impeller and the air inlet is made of a copper plate material, and the copper plate does not contain combustible elements, so that the aim of preventing static sparks can be fulfilled, and the requirements of users are met.
In the prior art, an arc-shaped cylinder (steel plate) and an explosion-proof ring (copper plate) are connected by a riveting processing method, edges are required to be lapped in the riveting processing of carbon steel and the copper plate, the copper plate is difficult to roll and form and is difficult to form, time-consuming, abrasion can be caused due to long-time washing of the riveted rivet, and the performance of a fan can be influenced.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a connecting method of an explosion-proof device at an air inlet of a centrifugal fan.
The invention provides a connecting method of an explosion-proof device at an air inlet of a centrifugal fan, which adopts the following technical scheme: the method comprises the following steps:
s1, blanking a proper metal plate material, and then rolling the metal plate material by using a plate rolling machine to obtain a conical cylinder, an arc cylinder and an explosion-proof ring;
s2, spinning the arc-shaped cylinder and the explosion-proof ring by using a spinning machine;
s3, placing the conical barrel on the platform, fixing one end of a first flange and one end of a second flange on the conical barrel respectively, fixedly connecting the other end of the first flange with a fan pipeline, fixedly connecting the other end of the second flange with a fan shell, and arranging a reinforcing rib between the first flange and the second flange;
s4, welding one end of the arc cylinder with one end of the conical cylinder;
and S5, welding the other end of the arc-shaped cylinder with one end of the explosion-proof ring.
By adopting the technical scheme, the arc-shaped cylinder and the explosion-proof ring are connected by adopting a welding processing method, the welding difficulty is high due to the low melting point of copper, but the welded arc-shaped cylinder is firm and durable, and the appearance is attractive.
Preferably, in step S1, the diameter of the end of the conical cylinder with the smaller diameter is the same as the diameter of the arc cylinder, and the diameter of the explosion-proof ring is the same as the diameter of the arc cylinder.
Preferably, when the spinning is performed in step S2, the interfaces of the arc-shaped cylinders coincide with each other, and the interfaces of the explosion-proof rings coincide with each other.
By adopting the technical scheme, the rolling can be finished at one time, and the welding can be directly carried out after the rolling is finished.
Preferably, in the step S3, one end of the first flange plate and one end of the second flange plate are both welded to the tapered cylinder, the other end of the first flange plate is welded to the blower pipeline, the other end of the second flange plate is welded to the blower casing, and the reinforcing ribs are welded to the first flange plate, the second flange plate and the tapered cylinder respectively.
By adopting the technical scheme, the reinforcing ribs are arranged between the first flange plate and the second flange plate, so that the integral rigidity of the air inlet is improved.
Preferably, the conical cylinder and the arc cylinder are made of steel plates.
Preferably, the explosion-proof ring is made of a copper plate.
Preferably, the welding in the step S5 specifically comprises the steps of firstly carrying out pretreatment, selecting a J507 welding rod with the diameter of 2.5-4 mm, winding a pure copper wire with the diameter of 1-1.5 mm outside the welding rod, wherein the density degree is 2-3 mm, baking the welding rod wound with the pure copper wire for 1-2 hours at 300-350 ℃, cooling to 90-100 ℃ for standby, cleaning up impurities such as rust, oil stain and water on the surface of a workpiece to be welded before welding, preheating the arc cylinder and the explosion-proof ring by using an ethylene block flame, wherein the preheating temperature of the arc cylinder is 650-700 ℃, the preheating temperature of the explosion-proof ring is 200-300 ℃, welding is carried out at 200-300 ℃, the welding current is 150-160A, the welding speed is 5-225 px/min, carrying out direct current reverse welding, when welding, the electric arc deflects to one side of the arc cylinder, so that the heat of the electric arc is deflected to one side of the arc cylinder, slightly inclining the molten pool to one side of the explosion-proof ring after the arc cylinder is formed, the weld rod wound with pure copper wire was then fed into the weld pool.
Preferably, the welding mode adopts arc welding.
In summary, the invention has the following beneficial technical effects:
1. the arc-shaped cylinder and the explosion-proof ring are connected by adopting a welding processing method, the processing method can save the rolling time of the scrap edges, rivets are not needed, the melting point of the copper plate is directly controlled for welding, and all the procedures of the air inlet are finished by welding.
2. The welded arc-shaped cylinder is firm and durable, and has attractive appearance.
3. The connecting method is simple to operate and high in practicability, and the air inlet with large diameter can be welded by the machining method, so that the riveting machining process is omitted, riveting equipment such as a riveting machine is not needed, and the cost can be saved.
Drawings
Fig. 1 is a schematic structural diagram of an explosion-proof device for an air inlet of a centrifugal fan.
Wherein, 1, a conical cylinder; 2. an arc-shaped cylinder; 3. an explosion-proof ring; 4. a first flange plate; 5. a second flange plate; 6. and (5) reinforcing ribs.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention discloses a connecting method of an explosion-proof device at an air inlet of a centrifugal fan.
Referring to fig. 1, the method includes the following steps:
s1, blanking a proper metal plate material, and then rolling the metal plate material by using a plate rolling machine to obtain a conical cylinder 1, an arc-shaped cylinder 2 and an anti-explosion ring 3, wherein the diameter of the smaller end of the conical cylinder 1 is the same as that of the arc-shaped cylinder 2, and the diameter of the anti-explosion ring 3 is the same as that of the arc-shaped cylinder 2;
s2, spinning the arc-shaped cylinder 2 and the explosion-proof ring 3 by using a spinning machine, wherein the joints of the arc-shaped cylinder 2 are overlapped, and the joints of the explosion-proof ring 3 are overlapped;
s3, placing the conical barrel 1 on a platform, respectively welding one end of a first flange plate 4 and one end of a second flange plate 5 on the conical barrel 1, welding the other end of the first flange plate 4 with a fan pipeline, welding the other end of the second flange plate 5 with a fan shell, arranging a reinforcing rib 6 between the first flange plate 4 and the second flange plate 5, and respectively welding the reinforcing rib 6 with the first flange plate 4, the second flange plate 5 and the conical barrel 1;
s4, welding one end of the arc-shaped cylinder 2 with one end of the conical cylinder 1, wherein the conical cylinder 1 and the arc-shaped cylinder 2 are made of steel plates;
s5, welding the other end of the arc-shaped cylinder 2 and one end of the explosion-proof ring 3, and specifically, pre-treating, namely selecting a J507 welding rod with the diameter of 2.5-4 mm, winding a pure copper wire with the diameter of 1-1.5 mm outside the welding rod, wherein the density degree is 2-3 mm, baking the welding rod wound with the pure copper wire for 1-2 hours at 300-350 ℃, cooling to 90-100 ℃ for standby, cleaning up impurities such as rust, oil stain, moisture and the like on the surface of a workpiece to be welded before welding, preheating the arc-shaped cylinder 2 and the explosion-proof ring 3 by using oxygen-ethylene block flame, wherein the preheating temperature of the arc-shaped cylinder 2 is 650-700 ℃, the preheating temperature of the explosion-proof ring 3 is 200-300 ℃, welding is carried out at 200-300 ℃, the welding current is 150-160A, the welding speed is 5-225 px/min, direct-current reverse welding is carried out, and when welding, the electric arc deflects to one side of the arc-shaped cylinder 2, so that the heat of the arc is biased to the arc-shaped cylinder 2, after a molten pool is formed on one side of the arc-shaped cylinder 2, the arc is slightly inclined towards one side of the explosion-proof ring 3, and then welding rods wound with pure copper wires are sent to the molten pool. The welding mode is arc welding.
When the anti-explosion device is used, firstly, a proper steel plate material is blanked according to the type of the air inlet, then, a plate bending machine is used for bending to obtain a conical cylinder 1, an arc cylinder 2 and an anti-explosion ring 3, the diameter of the end, with the smaller diameter, of the conical cylinder 1 is the same as that of the arc cylinder 2, and the diameter of the anti-explosion ring 3 is the same as that of the arc cylinder 2; then, carrying out spinning forming on the arc-shaped cylinder 2 and the explosion-proof ring 3 by using a spinning machine, so that the joints of the arc-shaped cylinder 2 wound into the cylinder are overlapped, and the joints of the explosion-proof ring 3 wound into the cylinder are overlapped; placing the conical cylinder 1 on a platform, respectively welding one end of a first flange plate 4 and one end of a second flange plate 5 on the conical cylinder 1, welding the other end of the first flange plate 4 with a fan pipeline, welding the other end of the second flange plate 5 with a fan shell, arranging a reinforcing rib 6 between the first flange plate 4 and the second flange plate 5, and respectively welding the reinforcing rib 6 with the first flange plate 4, the second flange plate 5 and the conical cylinder 1; one end of the arc-shaped cylinder 2 is welded with one end of the conical cylinder 1, and the conical cylinder 1 and the arc-shaped cylinder 2 are made of steel plates; the other end of the arc-shaped cylinder 2 is welded with one end of the explosion-proof ring 3, the concrete steps are firstly, preprocessing is carried out, a J507 welding rod with the diameter of 3.2mm is selected, a pure copper wire with the diameter of 1.25mm is wound outside the welding rod, the density degree is 2mm, the welding rod wound with the pure copper wire is baked for 2 hours at 350 ℃, then the temperature is reduced to 100 ℃ for standby application, impurities such as rust, oil stain, moisture and the like on the surface of a workpiece to be welded are cleaned up before welding, the arc-shaped cylinder 2 and the explosion-proof ring 3 are preheated by using an ethylene oxide block flame, the preheating temperature of the arc-shaped cylinder 2 is 650 ℃, the preheating temperature of the explosion-proof ring 3 is 200 ℃, welding is carried out at 200 ℃, the welding current is 160A, the welding speed is 100px/min, direct current reverse welding is carried out, during welding, the electric arc is firstly deflected to one side of the arc-shaped cylinder 2 to make the heat of the arc heavier than that of a steel plate, after a molten pool is formed on one side of the arc-shaped cylinder 2, the arc-shaped cylinder is slightly inclined to one side of the explosion-proof ring 3, and then, feeding a welding rod wound with a pure copper wire to the molten pool, wherein the welding wire is made of red copper and the welding mode is arc welding.
The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A connecting method of an explosion-proof device of an air inlet of a centrifugal fan is characterized by comprising the following steps: the method comprises the following steps:
s1, blanking a proper metal plate material, and then rolling the metal plate material by using a plate rolling machine to obtain a conical cylinder (1), an arc-shaped cylinder (2) and an explosion-proof ring (3);
s2, spinning the arc-shaped cylinder (2) and the explosion-proof ring (3) by using a spinning machine;
s3, placing the conical barrel (1) on a platform, fixing one end of a first flange plate (4) and one end of a second flange plate (5) on the conical barrel (1), fixedly connecting the other end of the first flange plate (4) with a fan pipeline, fixedly connecting the other end of the second flange plate (5) with a fan shell, and arranging a reinforcing rib (6) between the first flange plate (4) and the second flange plate (5);
s4, welding one end of the arc-shaped cylinder (2) with one end of the conical cylinder (1);
and S5, welding the other end of the arc-shaped cylinder (2) with one end of the explosion-proof ring (3).
2. The connection method of the explosion-proof device at the air inlet of the centrifugal fan as claimed in claim 1, characterized in that: in the step S1, the diameter of the end, with the smaller diameter, of the conical cylinder (1) is the same as that of the arc cylinder (2), and the diameter of the explosion-proof ring (3) is the same as that of the arc cylinder (2).
3. The connection method of the explosion-proof device at the air inlet of the centrifugal fan as claimed in claim 1, characterized in that: when spinning is performed in the step S2, the interfaces of the arc-shaped cylinders (2) coincide with each other, and the interfaces of the explosion-proof rings (3) coincide with each other.
4. The connection method of the explosion-proof device at the air inlet of the centrifugal fan as claimed in claim 1, characterized in that: and in the step S3, one ends of the first flange plate (4) and the second flange plate (5) are welded with the conical cylinder (1), the other end of the first flange plate (4) is welded with the fan pipeline, the other end of the second flange plate (5) is welded with the fan shell, and the reinforcing ribs (6) are respectively welded with the first flange plate (4), the second flange plate (5) and the conical cylinder (1).
5. The connection method of the explosion-proof device at the air inlet of the centrifugal fan as claimed in claim 1, characterized in that: the conical cylinder (1) and the arc cylinder (2) are made of steel plates.
6. The connection method of the explosion-proof device at the air inlet of the centrifugal fan as claimed in claim 1, characterized in that: the explosion-proof ring (3) is made of a copper plate.
7. The connection method of the explosion-proof device at the air inlet of the centrifugal fan as claimed in claim 1, characterized in that: the welding in the step S5 comprises the specific steps of firstly carrying out pretreatment, selecting a J507 welding rod with the diameter of 2.5-4 mm, winding a pure copper wire with the diameter of 1-1.5 mm outside the welding rod, wherein the density degree is 2-3 mm, baking the welding rod wound with the pure copper wire for 1-2 h at 300-350 ℃, then cooling to 90-100 ℃ for standby, cleaning up impurities such as rust, oil stain, moisture and the like on the surface of a workpiece to be welded before welding, preheating the arc cylinder (2) and the explosion-proof ring (3) by using an ethylene block flame, wherein the preheating temperature of the arc cylinder (2) is 650-700 ℃, the preheating temperature of the explosion-proof ring (3) is 200-300 ℃, welding is carried out at 200-300 ℃, the welding current is 150-160A, the welding speed is 5-225 px/min, direct current reverse welding is carried out, and during welding, the electric arc deflects to one side of the arc cylinder (2) to make the heat bias to the arc cylinder (2), after a molten pool is formed on one side of the arc-shaped cylinder (2), the arc is slightly inclined towards one side of the explosion-proof ring (3), and then welding rods wound with pure copper wires are fed into the molten pool.
8. The connection method of the explosion-proof device at the air inlet of the centrifugal fan as claimed in claim 7, characterized in that: the welding mode adopts arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210627619.XA CN114871706A (en) | 2022-06-06 | 2022-06-06 | Connecting method of explosion-proof device of air inlet of centrifugal fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210627619.XA CN114871706A (en) | 2022-06-06 | 2022-06-06 | Connecting method of explosion-proof device of air inlet of centrifugal fan |
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| CN114871706A true CN114871706A (en) | 2022-08-09 |
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| CN202210627619.XA Pending CN114871706A (en) | 2022-06-06 | 2022-06-06 | Connecting method of explosion-proof device of air inlet of centrifugal fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351512A (en) * | 2022-09-05 | 2022-11-18 | 山东省章丘鼓风机股份有限公司 | Machining method for conical arc-shaped air inlet of ventilator |
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| CN105689916A (en) * | 2014-11-27 | 2016-06-22 | 成都创客之家科技有限公司 | Welding rod suitable for welding carbon steel and copper materials |
| CN112780585A (en) * | 2019-11-06 | 2021-05-11 | 中国石油化工股份有限公司 | Explosion-proof centrifugal ventilator and explosion-proof method thereof |
| CN114017391A (en) * | 2021-11-30 | 2022-02-08 | 浙江韩益机电有限公司 | Centrifugal pump volute for cavitation suppression, design method thereof and installation method thereof |
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2022
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2492598A1 (en) * | 2011-02-28 | 2012-08-29 | BSH Bosch und Siemens Hausgeräte GmbH | Casing and range hood comprising the casing |
| CN102654137A (en) * | 2011-03-02 | 2012-09-05 | 南通大通宝富风机有限公司 | Air inlet set additionally provided with copper ring for air blower |
| CN202991632U (en) * | 2012-10-31 | 2013-06-12 | 重庆通用工业(集团)有限责任公司 | Anti-explosion air inlet of centrifugal fan |
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| CN115351512A (en) * | 2022-09-05 | 2022-11-18 | 山东省章丘鼓风机股份有限公司 | Machining method for conical arc-shaped air inlet of ventilator |
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