An explosion-proof blower

Abstract

The utility model relates to the technical field of explosion -proof blower, especially explosion -proof blower, a kind of explosion -proof blower, including outer cover, the inner shell is installed in outer cover inside, the centrifugal rotor is rotatably connected in inner shell inside, the drive mechanism is installed in outer cover rear end, drive mechanism bottom is connected with base, the transmission shaft of centrifugal rotor passes through outer cover, inner shell and is driven connection with drive mechanism after;The outer cover includes the front protective cover and rear protective cover of mutually closed connection, and the inner shell includes front shell and rear shell.The utility model is through setting up the front shell and rear shell of mutual separation, and the guiding structure of first guide rod and first locating pile, second guide rod and second locating pile is respectively arranged between front shell and front protective cover, rear shell and rear protective cover, realizes the overpressure automatic pressure relief and automatic reset function after pressure relief of inner shell, effectively avoids that inner shell breaks and leads to explosion due to overpressure, improves the security in the use process of equipment.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof blower technology, and in particular to an explosion-proof blower. Background Technology

[0002] Blowers, as a type of machine that uses the interaction between rotating blades and gas to compress and transport gas, are widely used in many fields. Their working principles are mainly divided into two types: Roots blowers and centrifugal blowers. Roots blowers rely on the reciprocating motion of the working parts in a closed container to compress and blow gas, which can generate high static pressure. Centrifugal blowers, on the other hand, use the blades on the high-speed rotating rotor to drive air into the blower and, under the action of centrifugal force, flow towards the blower's outlet, thereby increasing the airflow velocity.

[0003] In existing centrifugal blowers, pressure is directly proportional to the square of rotational speed. As rotational speed increases significantly, gas, under the centrifugal force generated by the high-speed rotation of the impeller, is thrown more rapidly and forcefully towards the impeller edge. This causes a rapid increase in kinetic energy and a sharp rise in pressure. Furthermore, as the inlet temperature rises, the thermal motion of gas molecules intensifies, increasing molecular activity and causing the internal pressure of the blower to expand. This pressure can exceed the limits of the casing and centrifugal rotor, easily leading to cracks in the casing or rotor. During operation, these cracks are torn apart by pressure, resulting in excessive local stress and ultimately metal fatigue fracture, forming fragments. These fragments, under centrifugal force or pressure, are ejected at extremely high speeds, possessing immense destructive power. They can puncture the blower casing, causing the blower to explode. The explosion releases the high-pressure gas instantly, triggering a powerful airflow impact that can easily affect other production equipment within a certain range. If fragments hit operators, it can cause serious personal injury or even endanger their lives. Utility Model Content

[0004] The purpose of this invention is to provide an explosion-proof blower to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An explosion-proof blower includes an outer cover, an inner shell installed inside the outer cover, a centrifugal rotor rotatably connected inside the inner shell, a drive mechanism installed at the rear end of the outer cover, a base connected to the bottom of the drive mechanism, and a drive shaft of the centrifugal rotor passing through the outer cover and the inner shell and then drivingly connected to the drive mechanism.

[0007] The outer cover includes a front protective cover and a rear protective cover that are closed to each other. The inner shell includes a front shell and a rear shell. The front protective cover and the front shell are slidably connected along the axial direction. The rear protective cover and the rear shell are slidably connected along the axial direction. A first elastic element is provided between the front protective cover and the front shell. A second elastic element is provided between the rear protective cover and the rear shell.

[0008] Preferably, the front shell is provided with a plurality of first guide rods around its outer contour on the end face of the front protective cover, and the inner end face of the front protective cover is provided with a first positioning post corresponding to the plurality of first guide rods. The first guide rods are coaxial with the first positioning posts and are slidably connected relative to the first positioning posts. The first elastic element is fitted on the first guide rods, and one end of the first elastic element abuts against the end face of the first positioning post, and the other end abuts against the end face of the front shell.

[0009] The rear shell has a plurality of second guide rods around its outer contour on the end face of the rear protective cover. The inner end face of the rear protective cover has a second positioning post corresponding to each of the plurality of second guide rods. The second guide rods are coaxial with the second positioning posts and are slidably connected relative to the second positioning posts. One end of the second elastic member abuts against the end face of the second positioning post, and the other end abuts against the end face of the rear shell.

[0010] Preferably, a first sealing ring and a second sealing ring are respectively embedded in the outer contour of the opposite end face of the front shell and the rear shell.

[0011] Preferably, the rear shell is provided with an air inlet and an air outlet, and the rear protective cover is provided with a first connecting pipe and a second connecting pipe penetrating the end face of the rear protective cover. The first connecting pipe is connected to the air inlet, and the second connecting pipe is connected to the air outlet.

[0012] Preferably, the other end of the first connecting pipe is connected to an air inlet pipe, and the other end of the second connecting pipe is connected to an air outlet pipe. The air inlet pipe and the air outlet pipe are fixedly installed on the base, and the other ends of the air inlet pipe and the air outlet pipe extend outward through the base.

[0013] Preferably, the first connecting pipe and the second connecting pipe are flexible connecting pipes.

[0014] Preferably, the outer side of the front protective cover is provided with a plurality of first reinforcing ribs at equal intervals around its outer contour, and the outer side of the rear protective cover is provided with a plurality of second reinforcing ribs at equal intervals around its outer contour.

[0015] Preferably, the outer contour of the front protective cover is provided with a plurality of first connecting posts, and the outer contour of the rear protective cover is provided with second connecting posts corresponding one-to-one with the plurality of first connecting posts, and the first connecting posts and the second connecting posts are connected by bolts.

[0016] Compared with the prior art, the present invention provides an explosion-proof blower with the following advantages: The present invention sets up a front shell and a rear shell that can be separated from each other, and sets a first guide rod and a first positioning post, and a second guide rod and a second positioning post between the front shell and the front protective cover, and between the rear shell and the rear protective cover, respectively. This realizes the function of automatic pressure relief and automatic reset of the inner shell after pressure relief, effectively avoiding the inner shell from bursting due to overpressure and improving the safety of the equipment during use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the upper right rear part of this utility model;

[0018] Figure 2 This is a partial cross-sectional view of the upper right three-dimensional structure of this utility model;

[0019] Figure 3 This is a partial cross-sectional schematic diagram of the connection structure between the outer cover and the inner shell of this utility model;

[0020] Figure 4 This is a side sectional view of the connection structure between the outer cover and the inner shell of this utility model;

[0021] Figure 5 This is an exploded structural diagram showing the connection relationship between the front shell, rear shell, and centrifugal rotor of this utility model;

[0022] Figure 6 For the present utility model Figure 2 Enlarged schematic diagram of a portion of the structure at point A;

[0023] Figure 7 For the present utility model Figure 3 A magnified view of the structure at point B in the middle.

[0024] In the diagram: 1. Outer cover; 11. Front protective cover; 111. First positioning post; 112. First reinforcing rib; 113. First connecting post; 12. Rear protective cover; 121. Second positioning post; 122. Air inlet; 123. Air outlet; 124. Second reinforcing rib; 125. Second connecting post; 2. Base; 3. Air inlet pipe; 4. Air outlet pipe; 5. Drive mechanism; 6. Inner shell; 61. Front shell; 611. First guide rod; 612. First sealing ring; 62. Rear shell; 621. Second guide rod; 622. Second sealing ring; 623. First connecting pipe; 624. Second connecting pipe; 7. Centrifugal rotor; 8. First elastic element; 9. Second elastic element. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Example, refer to Figure 1 - Figure 7 An explosion-proof blower includes an outer cover 1, an inner shell 6 installed inside the outer cover 1, a centrifugal rotor 7 rotatably connected inside the inner shell 6, a drive mechanism 5 (model YBF3-132S-4) installed at the rear end of the outer cover 1, a base 2 connected to the bottom of the drive mechanism 5, and a drive shaft of the centrifugal rotor 7 passing through the outer cover 1 and the inner shell 6 and then drivingly connected to the drive mechanism 5. Specifically, the drive shaft of the centrifugal rotor 7 passes through the rear protective cover 12 and the rear shell 62 in sequence and then drivingly connected to the output end of the drive mechanism 5. Bearings are provided between the centrifugal rotor 7 and the rear protective cover 12 and the rear shell 62 to reduce rotational friction. When the drive mechanism 5 is running, its output end drives the centrifugal rotor 7 to rotate inside the inner shell 6 through the drive shaft. The rotation of the centrifugal rotor 7 draws in the conveying airflow from the air inlet pipe 3, and under the pushing action of the centrifugal rotor 7, it moves along the inner shell 6 and is discharged from the air outlet pipe 4, realizing the gas conveying or blowing function.

[0028] The outer casing 1 includes a front protective cover 11 and a rear protective cover 12 that are closed to each other. The inner casing 6 includes a front casing 61 and a rear casing 62. The front protective cover 11 and the front casing 61 are slidably connected along the axial direction, and the rear protective cover 12 and the rear casing 62 are slidably connected along the axial direction. A first elastic element 8 is provided between the front protective cover 11 and the front casing 61, and a second elastic element 9 is provided between the rear protective cover 12 and the rear casing 62. When the blower is running, if the internal pressure in the inner casing 6 is high, the front casing 61 and the rear casing 62 will separate under the pressure, thereby relieving pressure and preventing the inner casing 6 from bursting due to overpressure. The front casing 61 compresses the first elastic element 8 and slides axially towards the end closer to the front protective cover 11, and the rear casing 62 compresses the second elastic element 9 and slides axially towards the end closer to the rear protective cover 12. After the pressure is relieved, the first elastic element 8 and the second elastic element 9 respectively push the front casing 61 and the rear casing 62 to reset, so that the front casing 61 and the rear casing 62 are closed.

[0029] Furthermore, the front shell 61 is provided with a plurality of first guide rods 611 around its outer contour on the end face of the front protective cover 11, and the inner end face of the front protective cover 11 is provided with first positioning posts 111 corresponding to the plurality of first guide rods 611. The first guide rods 611 and the first positioning posts 111 are coaxial and slidably connected relative to the first positioning posts 111. The first elastic member 8 is fitted on the first guide rods 611, one end of the first elastic member 8 abuts against the end face of the first positioning post 111, and the other end abuts against the end face of the front shell 61.

[0030] The rear shell 62 has several second guide rods 621 arranged around its outer contour on the end face of the rear protective cover 12. The inner end face of the rear protective cover 12 has second positioning posts 121 corresponding to the second guide rods 621. The second guide rods 621 and the second positioning posts 121 are coaxial and slidably connected relative to the second positioning posts 121. One end of the second elastic member 9 abuts against the end face of the second positioning post 121, and the other end abuts against the end face of the rear shell 62. The first guide rod 611 and the first positioning post 111 and the second guide rod 621 and the second positioning post 121 form a mechanical limit to prevent the inner shell 6 from shifting and getting stuck when depressurizing, ensuring that it moves linearly along the axial direction when depressurizing and returns to its precise position along the axial direction when resetting, avoiding secondary damage caused by shaking.

[0031] Furthermore, a first sealing ring 612 and a second sealing ring 622 are respectively embedded in the outer contour of the opposite end face of the front shell 61 and the rear shell 62. When the front shell 61 and the rear shell 62 are closed, the first sealing ring 612 and the second sealing ring 622 are squeezed and filled in the gap between the mating surfaces of the front shell 61 and the rear shell 62. When the pressure is released and the shell is separated, the first sealing ring 612 moves with the front shell 61, and the second sealing ring 622 moves with the rear shell 62, separating from each other and resealing after resetting.

[0032] Furthermore, the rear shell 62 is provided with an air inlet 122 and an air outlet 123, and the rear protective cover 12 is provided with a first connecting pipe 623 and a second connecting pipe 624 penetrating the end face of the rear protective cover 12. The first connecting pipe 623 is connected to the air inlet 122, and the second connecting pipe 624 is connected to the air outlet 123. Under the action of the centrifugal rotor 7, the gas enters the inner shell 6 through the air inlet pipe 3, the connecting pipe, and the air inlet 122. After being accelerated by the centrifugal rotor 7, it is discharged from the air outlet 123 and flows out through the second connecting pipe 624 and the air outlet pipe 4, forming a continuous airflow circulation to realize gas transportation or blowing effect.

[0033] Furthermore, the other end of the first connecting pipe 623 is connected to the air inlet pipe 3, and the other end of the second connecting pipe 624 is connected to the air outlet pipe 4. The air inlet pipe 3 and the air outlet pipe 4 are fixedly installed on the base 2, and the other ends of the air inlet pipe 3 and the air outlet pipe 4 extend outward through the base 2.

[0034] Furthermore, the first connecting pipe 623 and the second connecting pipe 624 are flexible connecting pipes. The flexible connecting pipes allow the rear shell 62 to deform and make way when it moves axially during the depressurization process. At the same time, they have a buffering effect to prevent the first connecting pipe 623 and the second connecting pipe 624 from being squeezed and broken.

[0035] Furthermore, the front protective cover 11 is provided with a plurality of first reinforcing ribs 112 at equal intervals around its outer contour, and the rear protective cover 12 is provided with a plurality of second reinforcing ribs 124 at equal intervals around its outer contour. The first reinforcing ribs 112 and the second reinforcing ribs 124 are used to increase the wall thickness of the front protective cover 11 and the rear protective cover 12, respectively, and improve the deformation resistance. The equal distribution of the first reinforcing ribs 112 and the second reinforcing ribs 124 makes the stress evenly distributed, reduces local overload, and prevents the outer cover 1 from deforming due to the pressure relief impact of the inner shell 6. At the same time, the first reinforcing ribs 112 and the second reinforcing ribs 124 can also increase the surface area of ​​the front protective cover 11 and the rear protective cover 12 for auxiliary heat dissipation, so that the heat generated by the operation of the motor and the centrifugal rotor 7 can be conducted to the outer cover 1 for heat dissipation through thermal radiation.

[0036] Furthermore, the outer contour of the front protective cover 11 is provided with a plurality of first connecting posts 113, and the outer contour of the rear protective cover 12 is provided with second connecting posts 125 corresponding one-to-one with the plurality of first connecting posts 113. The first connecting posts 113 and the second connecting posts 125 are connected by bolts. The bolts rigidly connect the front protective cover 11 and the rear protective cover 12 through the first connecting posts 113 and the second connecting posts 125, so that the mating surfaces fit tightly. The first connecting posts 113 and the second connecting posts 125 are equally distributed to ensure that the overall force of the outer cover 1 is balanced. The front protective cover 11 and the rear protective cover 12 are not sealed, so that the gas generated by the depressurization of the inner shell 6 can overflow through the gap between the front protective cover 11 and the rear protective cover 12. Therefore, this blower is not suitable for conveying toxic, harmful or flammable gases.

[0037] Working Principle: When the drive mechanism 5 operates, its output end drives the centrifugal rotor 7 installed in the inner shell 6 to rotate at high speed. At this time, due to the rotation of the centrifugal rotor 7, a negative pressure area is formed at the air intake. Under the action of atmospheric pressure, the external gas is drawn into the inner shell 6 through the air intake 122 of the rear shell 62 via the air intake pipe 3 and the first connecting pipe 623. After the gas enters the inner shell 6, the rotating impeller imparts an initial velocity to the gas in the direction of rotation, causing the gas to begin to move with the rotation of the impeller. The impeller has multiple blades. During the high-speed rotation of the impeller, the air between the blades is quickly thrown towards the edge of the impeller under the action of centrifugal force. At the same time, under the continuous action of centrifugal force, the gas is accelerated outward, and the pressure increases accordingly. As the impeller continues to rotate, the gas is continuously accelerated, and its kinetic energy continues to increase, which further increases the pressure of the flowing gas. In this process, the degree of compression and speed of the gas will be further increased every time it passes through the impeller blades, thereby increasing the outflow velocity of the gas. The body is squeezed out by the impeller blades and discharged from the outlet pipe 4 through the second connecting pipe 624 connected to the outlet 123, completing the blowing process. When the pressure accumulated inside the inner shell 6 is large, the front shell 61 and the rear shell 62 will overcome the elastic force of the first elastic element 8 and the second elastic element 9 under the pressure and separate relative to release the pressure, thus preventing the inner shell 6 from bursting due to overpressure. The front shell 61 compresses the first elastic element 8 and slides axially towards the end closer to the front protective cover 11, and the rear shell 62 compresses the second elastic element 9 and slides axially towards the end closer to the rear protective cover 12. After the pressure is released, the first elastic element 8 and the second elastic element 9 push the front shell 61 and the rear shell 62 to reset by their own elastic force, so that the front shell 61 and the rear shell 62 close again, ensuring that the pressure of the inner shell 6 is maintained within a safe range and ensuring the normal operation of the blower.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof blower comprising a casing (1), characterized in that: The outer cover (1) is equipped with an inner shell (6), and a centrifugal rotor (7) is rotatably connected inside the inner shell (6). A drive mechanism (5) is installed at the rear end of the outer cover (1), and a base (2) is connected to the bottom of the drive mechanism (5). The drive shaft of the centrifugal rotor (7) passes through the outer cover (1) and the inner shell (6) and is driven by the drive mechanism (5). The outer cover (1) includes a front protective cover (11) and a rear protective cover (12) that are closed to each other. The inner shell (6) includes a front shell (61) and a rear shell (62). The front protective cover (11) and the front shell (61) are slidably connected along the axial direction. The rear protective cover (12) and the rear shell (62) are slidably connected along the axial direction. A first elastic element (8) is provided between the front protective cover (11) and the front shell (61). A second elastic element (9) is provided between the rear protective cover (12) and the rear shell (62).

2. A blast-resistant air blower as claimed in claim 1, wherein, The front shell (61) has a plurality of first guide rods (611) around its outer contour on the end face of the front protective cover (11) and the inner end face of the front protective cover (11) has a first positioning post (111) corresponding to the plurality of first guide rods (611) one by one. The first guide rod (611) and the first positioning post (111) are coaxial and slidably connected relative to the first positioning post (111). The first elastic member (8) is fitted on the first guide rod (611). One end of the first elastic member (8) abuts against the end face of the first positioning post (111) and the other end abuts against the end face of the front shell (61). The rear shell (62) has a plurality of second guide rods (621) around its outer contour on the end face of the rear protective cover (12). The inner end face of the rear protective cover (12) has a second positioning post (121) corresponding to the plurality of second guide rods (621). The second guide rod (621) is coaxial with the second positioning post (121) and is slidably connected to the second positioning post (121). One end of the second elastic member (9) abuts against the end face of the second positioning post (121), and the other end abuts against the end face of the rear shell (62).

3. The explosion-proof blower according to claim 2, characterized in that, The front shell (61) and the rear shell (62) are respectively fitted with a first sealing ring (612) and a second sealing ring (622) on the outer contour of the opposite side end face.

4. The explosion-proof blower according to claim 3, characterized in that, The rear shell (62) is provided with an air inlet (122) and an air outlet (123). The rear protective cover (12) is provided with a first connecting pipe (623) and a second connecting pipe (624) that penetrate the end face of the rear protective cover (12). The first connecting pipe (623) is connected to the air inlet (122), and the second connecting pipe (624) is connected to the air outlet (123).

5. The explosion-proof blower according to claim 4, characterized in that, The first connecting pipe (623) is connected to an air inlet pipe (3) at one end, and the second connecting pipe (624) is connected to an air outlet pipe (4) at the other end. The air inlet pipe (3) and the air outlet pipe (4) are fixedly installed on the base (2), and the other ends of the air inlet pipe (3) and the air outlet pipe (4) extend outward through the base (2).

6. The explosion-proof blower according to claim 4, characterized in that, The first connecting pipe (623) and the second connecting pipe (624) are flexible connecting pipes.

7. The explosion-proof blower according to claim 1, characterized in that, The front protective cover (11) is provided with a plurality of first reinforcing ribs (112) at equal intervals around its outer contour, and the rear protective cover (12) is provided with a plurality of second reinforcing ribs (124) at equal intervals around its outer contour.

8. The explosion-proof blower according to claim 1, characterized in that, The outer contour of the front protective cover (11) is provided with a plurality of first connecting posts (113), and the outer contour of the rear protective cover (12) is provided with second connecting posts (125) corresponding one-to-one with the plurality of first connecting posts (113). The first connecting posts (113) and the second connecting posts (125) are connected by bolts.

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