Thrust bearing differential pressure balancing structure of air suspension blower

Abstract

The utility model relates to the field of blowers, in particular to a thrust bearing differential pressure balancing structure of an air suspension blower, which comprises a casing, a motor rotor rotatably mounted in the casing, an impeller mounted on the motor rotor, a thrust bearing plate mounted on the motor rotor, a bearing seat and a thrust bearing cover plate mounted in the casing. A thrust bearing cover plate is arranged on the bearing seat, a thrust bearing sheet is arranged on the thrust bearing cover plate, an air chamber is arranged between the bearing seat and the thrust bearing cover plate, the thrust bearing sheet extends into the air chamber, and the thrust bearing cover plate is positioned between the bearing seat and the impeller. According to the pressure difference balancing structure of the thrust bearing of the air suspension air blower, part of high-pressure air generated in the operation process of the air blower is drained into the thrust bearing, so that the air chamber achieves pressure difference balance, pressure difference dynamic balance of the thrust bearing is achieved, and the pressure difference balancing structure is suitable for the working condition requirement of a high-rotating-speed air blower.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of air blower, concretely relates to air suspension air blower thrust bearing pressure difference balance structure. BACKGROUND

[0002] The traditional air blower includes a casing, a motor stator is installed in the casing, a motor rotor is rotatably installed in the motor stator, an impeller is installed on the motor rotor, a compressor casing is installed at the end of the casing, the motor rotor drives the impeller to rotate during work, and compressed air is discharged from the compressor casing, the air suspension centrifugal air blower is provided with two radial air suspension bearings at both ends of the air blower casing, which supports the motor rotor in the radial direction, in order to limit the motor rotor in the axial direction, a bearing seat is installed in the casing, a sealing cover plate is buckled on the bearing seat, an air chamber is arranged between the bearing seat and the sealing cover plate, thrust air bearings are installed on the front and rear inner walls of the air chamber, thrust pieces are installed on the motor rotor, the thrust pieces extend into the air chamber, the thrust pieces are spaced apart from the thrust air bearings, and a sealing cover plate that closes the open end of the casing is also installed at the end of the casing.

[0003] During the operation of the air suspension high-speed air blower, the impeller rotates at high speed and generates a large axial force on the rotor, and the rotor assembly inevitably moves forward or backward, although the thrust piece and the thrust air bearing are installed at the rear side of the impeller, the thrust piece generates a thrust force under the driving of the rotor assembly, which can effectively balance the axial thrust generated by the rotation of the impeller. However, as the power and pressure of the air blower increase, the size of the impeller also increases, and the axial thrust generated during rotation also increases, and the pressure difference between the back of the impeller and the thrust air bearing also increases. At this time, the rotor will rub the thrust air bearing due to the uneven pressure difference before and after the impeller, which leads to a relatively high failure rate of the thrust air suspension bearing in the entire air suspension system, and needs to be improved. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of air suspension air blower thrust bearing pressure difference balance structure for the above problems, which can effectively adjust the axial force of rotor.

[0005] To achieve the above purpose, the utility model discloses

[0006] The application discloses a thrust bearing pressure difference balance structure of an air suspension blower, which comprises a casing, a motor rotor rotatably arranged in the casing, an impeller arranged on the motor rotor, a thrust piece arranged on the motor rotor, a bearing seat and a thrust bearing cover plate arranged in the casing for arranging a thrust air bearing, an air chamber arranged between the bearing seat and the thrust bearing cover plate, the thrust air bearing being arranged on the inner wall of the air chamber, the thrust piece extending into the air chamber, the motor rotor extending leftward and rightward, the thrust air bearing being arranged on the inner wall of the air chamber near the left and right sides of the thrust piece, the thrust bearing cover plate being arranged between the bearing seat and the impeller, a gas guide pipe arranged on the casing and used for sending part of compressed gas at the gas outlet end of the blower into the air chamber, the gas outlet end of the blower being a gas flow outlet of the blower, a connecting pipeline of the gas flow outlet of the blower or a part of the blower body near the gas flow outlet, a gas flow channel arranged in the thrust bearing cover plate and communicated with the air chamber, and the gas flow channel being communicated with the gas guide pipe.

[0007] The compressed gas of the blower is used as the gas source, no additional power is needed, the high-pressure gas at the gas outlet end of the blower is introduced into the air chamber from the gas outlet end through the gas guide pipe, the pressure difference is balanced, the pressure balance is formed, the pressure difference at the impeller is consistent with the pressure difference in the air chamber of the thrust air bearing, and thus the abrasion of the thrust air bearing caused by the axial movement of the rotor assembly is avoided.

[0008] An air outlet pipe joint is arranged on the casing, the gas guide pipe is connected with the air outlet pipe joint, a gas flow bend is arranged in the bearing seat and communicated with the gas flow channel, and the lower end of the air outlet pipe joint is inserted into the gas flow bend. The gas flow bend is in an L shape, the compressed gas in the gas guide pipe firstly enters the gas flow bend through the air outlet pipe, and then enters the gas flow channel, the directional conveying of the high-pressure gas can be realized through the air outlet pipe joint and the gas flow bend, the gas flow path is optimized, and the equipment maintenance is facilitated.

[0009] A sealing rubber ring is arranged on the matching surface of the air outlet pipe joint and the gas flow bend. The sealing rubber ring prevents gas leakage and ensures the stability of the pressure in the air chamber. The air inlet pipe joint and the air outlet pipe joint can be provided with two groups, and the two gas guide pipes work independently.

[0010] A compressor casing is arranged at the end of the casing, a compressor casing insert is arranged on the compressor casing, the impeller is arranged in the compressor casing insert, and an air outlet connecting pipeline is arranged at the air outlet end of the compressor casing. The compressor casing insert is responsible for air intake, the compressor casing is a volute capable of compressing gas, the gas flow enters the compressor casing through the compressor casing insert, the compressed gas flow is formed in the compressor casing, most of the gas flow is output outward, and a small part of the gas flow enters the air chamber through the gas guide pipe.

[0011] An air inlet pipe joint is arranged on the compressor casing or the air outlet connecting pipeline, and the gas guide pipe is connected with the air inlet pipe joint. The air inlet pipe joint can be arranged on the compressor casing or the air outlet connecting pipeline according to the requirement.

[0012] The other end of the casing is also provided with an air compressor casing, and an air outlet connecting pipeline is connected with a bushing at the other end of the casing.

[0013] The end of the casing is provided with a sealing cover plate, a recess is arranged at one end of the thrust bearing cover plate close to the sealing cover plate, the recess is open towards the sealing cover plate, the sealing cover plate is pressed against the thrust bearing cover plate, and the sealing cover plate closes the opening of the recess to form an air flow channel. The sealing cover plate has the functions of structural support and air flow guide, and the recess serves as part of the air flow channel, facilitating machining.

[0014] The sealing cover plate is provided with an avoiding hole, the end of the motor rotor protrudes out of the casing through the avoiding hole, and the impeller is located outside the casing, so that the sealing cover plate can prevent air flow generated by rotation of the impeller from entering the casing.

[0015] The motor rotor is sleeved with a sealing sleeve, one end of the sealing sleeve abuts against the thrust piece, the other end of the sealing sleeve abuts against the impeller, the sealing sleeve is inserted into the avoiding hole, and a plurality of annular teeth are arranged in the avoiding hole and do not contact the sealing sleeve to form a labyrinth seal. The non-contact design of the annular teeth and the sealing sleeve can avoid friction loss, can prevent compressed air flow in the air flow ring from leaking, and can ensure that the compressed air flow fully enters the air chamber.

[0016] The thrust bearing cover plate is sleeved on the sealing sleeve, and the thrust bearing cover plate and the sealing sleeve are spaced from each other to form an air flow ring for air flow, one end of the air flow ring is communicated with the air chamber, and the other end of the air flow ring is communicated with the air flow channel. The annular gap can balance the air flow distribution and prevent local pressure imbalance, and further utilizes high-pressure gas to enhance the axial force balance capability of the bearing.

[0017] In summary, the air blower has the advantages that part of high-pressure gas generated during operation of the air blower is introduced into the thrust bearing, the pressure difference of the air chamber is balanced, the situation that the rotor rubs against the thrust air bearing due to uneven pressure difference before and after the impeller is prevented, and the balance effect of the thrust air bearing is increased as the speed and pressure of the air blower during operation are continuously increased. The high-pressure air flow channels in the air blower are fluid channels formed by cooperation of structural members, no additional structural member needs to be added, the structure is simple, components are convenient to replace, and the overall structural cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a partial structural schematic view of the air blower.

[0019] Figure 2 It is a sectional structural schematic view of the bearing seat and the sealing cover plate.

[0020] Figure 3 It is Figure 2 It is an enlarged structural schematic view of the structure at A.

[0021] In the figure: motor rotor 1, motor stator 2, casing 3, bearing seat 4, thrust air bearing 5, air outlet pipe joint 6, air guide pipe 7, thrust piece 8, compressor casing 9, impeller 10, compressor casing bushing 11, air outlet connecting pipe 12, sealing cover plate 13, thrust bearing cover plate 14, sealing sleeve 15, annular tooth 16, air flow channel 17, air chamber 18, air inlet pipe joint 19, air flow bend 20, air flow ring channel 21, sealing rubber ring 22. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0023] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The following is a description of the preferred embodiments of the present application in conjunction with the accompanying drawings.

[0027] The air suspension blower thrust bearing pressure difference balance structure is characterized in that: a gas chamber 18 is arranged between the bearing seat 4 and the thrust bearing cover plate 14; the impeller 10 is arranged on the motor rotor 1; the thrust bearing cover plate 14 is located between the bearing seat 4 and the impeller 10; the air guide pipe 7 for sending part of the compressed gas at the air outlet end of the blower into the gas chamber 18 is arranged on the casing 3; the air flow channel 17 is arranged in the thrust bearing cover plate 14 and is connected with the gas chamber 18; and the air flow channel 17 is connected with the air guide pipe 7. Figure 1 The high-pressure gas at the air outlet end of the blower is introduced into the gas chamber 18 through the air guide pipe 7 to balance the pressure difference and form pressure balance, so that the pressure difference at the impeller 10 is consistent with the pressure difference of the gas chamber 18 of the thrust air bearing 5, thereby avoiding the situation that the axial movement of the rotor assembly causes wear of the thrust air bearing 5.

[0028] The air guide pipe 7 is connected with the air outlet pipe joint 6, the air flow bend 20 is arranged in the bearing seat 4 and is connected with the air flow channel 17, and the lower end of the air outlet pipe joint 6 is inserted into the air flow bend 20. Figure 3 The air flow bend 20 is L-shaped, the compressed gas in the air guide pipe 7 first enters the air flow bend 20 through the air outlet pipe and then enters the air flow channel 17, the directional delivery of the high-pressure gas can be realized through the air outlet pipe joint 6 and the air flow bend 20, the air flow path is optimized, and the equipment maintenance is facilitated. The sealing rubber ring 22 is arranged on the matching surface of the air outlet pipe joint 6 and the air flow bend 20. The sealing rubber ring 22 prevents gas leakage and ensures the stability of the pressure of the gas chamber 18.

[0029] The air guide pipe 7 is connected with the air outlet pipe joint 6, the air flow bend 20 is arranged in the bearing seat 4 and is connected with the air flow channel 17, and the lower end of the air outlet pipe joint 6 is inserted into the air flow bend 20. Figure 1 The air flow bend 20 is L-shaped, the compressed gas in the air guide pipe 7 first enters the air flow bend 20 through the air outlet pipe and then enters the air flow channel 17, the directional delivery of the high-pressure gas can be realized through the air outlet pipe joint 6 and the air flow bend 20, the air flow path is optimized, and the equipment maintenance is facilitated. The sealing rubber ring 22 is arranged on the matching surface of the air outlet pipe joint 6 and the air flow bend 20. The sealing rubber ring 22 prevents gas leakage and ensures the stability of the pressure of the gas chamber 18.

[0030] The air guide pipe 7 is connected with the air outlet pipe joint 6, the air flow bend 20 is arranged in the bearing seat 4 and is connected with the air flow channel 17, and the lower end of the air outlet pipe joint 6 is inserted into the air flow bend 20. Figure 2The end of the casing 3 is provided with a sealing cover plate 13, a recess is formed in one end of a thrust bearing cover plate 14 close to the sealing cover plate 13, the recess is open to the sealing cover plate 13, the sealing cover plate 13 is pressed against the thrust bearing cover plate 14, and the sealing cover plate 13 closes the opening of the recess to form an air flow channel 17. The sealing cover plate 13 has the functions of structural support and air flow guide, the recess serves as a part of the air flow channel 17, and the sealing cover plate 13 is convenient to process. The sealing cover plate 13 is provided with an avoiding hole, the end of the motor rotor 1 protrudes out of the casing 3 through the avoiding hole, the impeller 10 is located outside the casing 3, and the sealing cover plate 13 can prevent the air flow generated by the rotation of the impeller 10 from entering the casing 3.

[0031] Referring to the drawings Figure 3 The motor rotor 1 is sleeved with a sealing sleeve 15, one end of the sealing sleeve 15 abuts against the thrust piece 8, and the other end of the sealing sleeve 15 abuts against the impeller 10. The sealing sleeve 15 is inserted into the avoiding hole, and a plurality of annular teeth 16 are arranged in the avoiding hole and do not contact the sealing sleeve 15 to form a labyrinth seal. The annular teeth 16 and the sealing sleeve 15 are designed to be non-contact to avoid friction loss, can avoid the leakage of the compressed air flow in the air flow ring channel 21, and ensure that the compressed air flow fully enters the air chamber 18. The thrust bearing cover plate 14 is sleeved on the sealing sleeve 15, and the thrust bearing cover plate 14 and the sealing sleeve 15 are spaced from each other to form the air flow ring channel 21 through which the air flow passes. One end of the air flow ring channel 21 is communicated with the air chamber 18, and the other end of the air flow ring channel 21 is communicated with the air flow channel 17. The annular gap can balance the air flow distribution and avoid local pressure unevenness, and further utilize the high-pressure gas to enhance the axial force balance ability of the bearing.

[0032] Referring to the drawings Figure 2 When the motor stator 2 is energized to generate a rotating magnetic field to drive the motor rotor 1 assembly to start rotating, the motor rotor 1 drives the impeller 10 and the thrust piece 8 to synchronously rotate. A large amount of external air is continuously sucked in from the compressor casing sleeve 11 due to the rotation of the impeller 10, and is compressed into high-pressure air flow by the compressor casing 9. Most of the high-pressure air flow is discharged from the compressor casing 9, enters the next stage compressor casing 9 through the secondary connecting pipeline, is compressed, and is discharged. A small part of the high-pressure air flow is introduced into the air chamber 18 of the thrust air bearing 5 through the high-pressure air guide pipe 7 on the secondary connecting pipeline to achieve the effect of balancing the pressure difference.

[0033] The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. An air suspension blower thrust bearing differential pressure balance structure, comprising a casing (3), a motor rotor (1) is rotatably installed in the casing (3), an impeller (10) is installed on the motor rotor (1), a thrust piece (8) is installed on the motor rotor (1), a bearing seat (4) and a thrust bearing cover plate (14) are installed in the casing (3), an air chamber (18) is arranged between the bearing seat (4) and the thrust bearing cover plate (14), a thrust air bearing (5) is installed on the inner wall of the air chamber (18), the thrust piece (8) extends into the air chamber (18), and the thrust bearing cover plate (14) is located between the bearing seat (4) and the impeller (10), characterized in that, The casing (3) is provided with a gas guide pipe (7) for guiding the compressed gas from the air outlet end of the blower into the air chamber (18), and the thrust bearing cover plate (14) is provided with a gas flow channel (17) in communication with the air chamber (18), and the gas flow channel (17) is in communication with the gas guide pipe (7).

2. The air bearing thrust bearing pressure differential balancing structure of claim 1, wherein, The casing (3) is provided with an air outlet pipe joint (6), the gas guide pipe (7) is connected to the air outlet pipe joint (6), the bearing seat (4) is provided with a gas flow bend (20), the gas flow bend (20) is in communication with the gas flow channel (17), and the lower end of the air outlet pipe joint (6) is inserted into the gas flow bend (20).

3. The air bearing thrust bearing pressure differential balancing structure of claim 2, wherein, The air outlet pipe joint (6) is provided with a sealing rubber ring (22) on the matching surface of the air outlet pipe joint (6) and the gas flow bend (20).

4. The air bearing thrust bearing pressure differential balancing structure of claim 1, wherein, The casing (3) is provided with a compressor casing (9) at one end, the compressor casing (9) is provided with a compressor casing sleeve (11), the impeller (10) is located in the compressor casing sleeve (11), and the air outlet end of the compressor casing (9) is provided with an air outlet connecting pipe (12).

5. The air bearing thrust bearing pressure differential balancing structure of claim 4, wherein, The compressor casing (9) or the air outlet connecting pipe (12) is provided with an air inlet pipe joint (19), and the gas guide pipe (7) is connected to the air inlet pipe joint (19).

6. The air bearing thrust bearing pressure differential balancing structure of claim 4, wherein, The other end of the casing (3) is also provided with a compressor casing (9), and the air outlet connecting pipe (12) is connected to the compressor casing sleeve (11) at the other end of the casing (3).

7. The air bearing thrust bearing pressure differential balancing structure of claim 1, wherein, The casing (3) is provided with a sealing cover plate (13) at one end, the thrust bearing cover plate (14) is provided with a groove at one end close to the sealing cover plate (13), the groove is open towards the sealing cover plate (13), the sealing cover plate (13) is pressed against the thrust bearing cover plate (14), and the sealing cover plate (13) closes the groove opening to form the gas flow channel (17).

8. The air bearing thrust bearing pressure differential balancing structure of claim 7, wherein, The sealing cover plate (13) is provided with an avoiding hole, the end of the motor rotor (1) protrudes out of the casing (3) through the avoiding hole, and the impeller (10) is located outside the casing (3).

9. The air bearing thrust bearing pressure differential balancing structure of claim 8, wherein, The motor rotor (1) is provided with a sealing sleeve (15), one end of the sealing sleeve (15) abuts against the thrust piece (8), the other end of the sealing sleeve (15) abuts against the impeller (10), the sealing sleeve (15) is inserted into the avoiding hole, and the avoiding hole is provided with a plurality of annular teeth (16), the annular teeth (16) are not in contact with the sealing sleeve (15) and form a labyrinth seal.

10. The air bearing thrust bearing pressure differential balancing structure of claim 9, wherein, The thrust bearing cover plate (14) is sleeved on the sealing sleeve (15), and the thrust bearing cover plate (14) and the sealing sleeve (15) are spaced apart from each other to form a gas flow ring channel (21) for the gas flow, one end of the gas flow ring channel (21) is in communication with the air chamber (18), and the other end of the gas flow ring channel (21) is in communication with the gas flow channel (17).

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