A high-pressure ratio air-cooled two-stage boosted air suspension centrifugal compressor

Abstract

The present invention discloses a high-pressure ratio air-cooled two-stage supercharged air-suspended centrifugal compressor, which relates to the technical field of compressors, including a motor seat, one end of which is equipped with a compressor body, the compressor body including a primary compression mechanism and a secondary compression mechanism, a shell is installed between the primary compression mechanism and the secondary compression mechanism, a motor stator is installed in the shell, a front bearing seat is installed between the motor stator and the secondary compression mechanism, a rear bearing seat is installed between the motor stator and the primary compression mechanism, and gaps are provided between the motor stator and the front bearing seat and the rear bearing seat; an air-cooling sleeve is provided between the shell and the motor stator. Thus, the present invention abandons the traditional water-cooling cooling system, greatly simplifies the overall structure of the product, ensures the reliability of the long-term operation of the equipment, and adopts a negative pressure cooling fan cooling method to solve the problem that the high-pressure ratio centrifugal compressor cannot be cooled down due to excessive pressurization temperature.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a high-pressure ratio air-cooled two-stage boosted air suspension centrifugal compressor. Background Art

[0002] The air suspension centrifugal compressor is a high-speed rotating device, the core of which lies in the application of suspension bearing technology. Unlike traditional mechanical bearings, suspension bearings use the principle of gas dynamic pressure to enable the rotor to achieve non-contact movement with the stator through the support of gas when rotating at high speed. This design eliminates friction and wear, greatly improving the efficiency and life of the equipment.

[0003] Air suspension centrifugal compressors have many advantages, such as: High efficiency: Due to the lack of friction loss, air suspension centrifugal compressors have less energy loss and therefore have a higher energy efficiency ratio. Low vibration: Since there is no mechanical contact, the vibration and noise levels are low, which helps to improve the stability and reliability of the system. Long life: Due to the reduced mechanical wear, air suspension centrifugal compressors generally have a longer service life and less maintenance requirements. Adjustability: By controlling the magnetic field and the motor, the operating parameters of the compressor can be precisely adjusted to meet the needs of different working conditions.

[0004] Although air-suspended centrifugal compressors have many advantages, existing air-suspended centrifugal compressors still have disadvantages such as large size, low pressure, complex cooling structure and cumbersome maintenance. Summary of the invention

[0005] In view of the above defects, the purpose of the present invention is to provide a high-pressure ratio air-cooled two-stage boosted air-suspended centrifugal compressor, which aims to solve the shortcomings of the air-suspended centrifugal compressor in the prior art, such as large size, low pressure, complex cooling structure and cumbersome maintenance.

[0006] In order to solve the above technical problems, the technical solution of the present invention is:

[0007] A high-pressure ratio air-cooled two-stage supercharged air suspension centrifugal compressor, comprising a motor seat, one end of the motor seat is mounted with a compressor body, the compressor body comprises a primary compression mechanism and a secondary compression mechanism, a shell is mounted between the primary compression mechanism and the secondary compression mechanism, a motor stator is mounted in the shell, a front bearing seat is mounted between the stator and the secondary compression mechanism, a rear bearing seat is mounted between the motor stator and the primary compression mechanism, and gaps are arranged between the motor stator and the front bearing seat and the rear bearing seat; a motor is also mounted in the shell Rotor, the front bearing seat and the rear bearing seat are respectively installed at the two ends of the motor rotor, the motor stator is arranged around the motor rotor, and a gap is arranged between the motor rotor and the motor stator; an air cooling sleeve is arranged between the shell and the motor stator, the motor stator is nested in the air cooling sleeve, and a plurality of cooling fins are installed on the side wall of the air cooling sleeve; an air intake duct is installed between the shell and the motor seat, and an air chamber is arranged between the end of the air intake duct away from the motor seat and the air cooling sleeve; an air outlet duct is installed on the shell, and one end of the air outlet duct is connected with the inside of the shell.

[0008] Wherein, the air cooling sleeve includes a connected cooling section and a ventilation section, the ventilation section is located between the cooling section and the front bearing seat, the air chamber is located between the air intake duct and the cooling section, a plurality of cooling fins are arranged around the cooling section, a plurality of ventilation holes are arranged on the side wall of the ventilation section, and the ventilation holes extend from the outer wall of the ventilation section to the inner wall of the ventilation section.

[0009] Among them, a motor rotor is installed at one end of the rear bearing seat away from the front bearing seat, and a plurality of fan blades are installed at one end of the motor rotor away from the rear bearing seat, and the air outlet pipe is arranged in coordination with the fan blades.

[0010] A fan cover is installed between the fan blades and the rear bearing seat, the motor rotor passes through the fan cover, and a gap is set between the motor rotor and the fan cover. The end of the fan cover facing the rear bearing seat is recessed towards the end of the fan cover away from the rear bearing seat to form an arc-shaped concave surface.

[0011] Wherein, the side edge of the fan cover is connected to the inner wall of the shell, and the side edge of the fan cover is located between the air inlet duct and the air outlet duct.

[0012] Wherein, a sealing cover plate is installed at one end of the shell, and the sealing cover plate is located on the side of the fan blade away from the rear bearing seat.

[0013] The heat dissipation fins are in the shape of long strips, and the length direction of the heat dissipation fins is the same as the length direction of the air cooling sleeve.

[0014] Wherein, the heat dissipation fins are arc-shaped, and a plurality of the heat dissipation fins are arranged in a spiral around the outer wall of the air cooling jacket.

[0015] Wherein, a plurality of grooves are arranged on the outer wall of the motor stator, the length direction of the plurality of grooves is the same as the length direction of the motor stator, and the plurality of grooves are evenly arranged around the motor stator.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are:

[0017] First, through the dual-channel negative pressure fan cooling circulation structure, the traditional positive pressure cooling fan will increase the pressure of the cooling air while delivering cooling air, which will cause the temperature of the cooling air to rise. Using a negative pressure fan will not increase the internal pressure of the motor, will not increase the temperature of the cooling air, and will directly extract a large amount of heat from the inside of the motor.

[0018] Secondly, the present invention abandons the traditional water-cooling system, greatly simplifies the overall structure of the product, and ensures the reliability of long-term operation of the equipment. The use of negative pressure cooling fan cooling not only solves the problem that the high-pressure centrifugal compressor pressurization temperature is too high and cannot be cooled down, but also the negative pressure cooling fan cooling circulation system requires a small cooling flow rate and less energy consumption loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a conventional water-cooled centrifugal compressor;

[0020] Figure 2 This is the structural diagram of the centrifugal compressor of this scheme;

[0021] Figure 3 is a cross-sectional view of a centrifugal compressor;

[0022] Figure 4 This is the structural diagram of the air cooling jacket;

[0023] Figure 5 It is a structural diagram of another air cooling jacket;

[0024] Figure 6 This is the main view of the motor stator;

[0025] Figure 7 This is the structural diagram of the motor stator.

[0026] In the figure: 1-motor base, 10-housing, 101-primary compression mechanism, 102-secondary compression mechanism, 103-air inlet duct, 104-air outlet duct, 2-air cooling jacket, 21-ventilation section, 211-ventilation hole, 22-cooling section, 221-heat sink fins, 23-air chamber, 3-motor stator, 31-groove, 4-front bearing seat, 5-motor rotor, 6-fan cover, 7-fan blades, 8-sealing cover plate, 9-rear bearing seat. DETAILED DESCRIPTION

[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0028] Example:

[0029] like Figure 1 In the traditional water circulation cooling centrifugal compressor shown, although the addition of the water cooling mechanism greatly improves the cooling efficiency of the centrifugal compressor, the addition of the water cooling mechanism increases the volume of the entire device, and after long-term use, the pipes of the water cooling mechanism are easily corroded and leak, resulting in the problem of water leakage, causing the entire device to be scrapped.

[0030] In order to solve the shortcomings of traditional water-cooled centrifugal compressors, such as Figure 2-Figure 7 As shown, a high-pressure ratio air-cooled two-stage supercharged air suspension centrifugal compressor includes a motor base 1, one end of the motor base 1 is installed with a compressor body, the compressor body includes a primary compression mechanism 101 and a secondary compression mechanism 102, a housing 10 is installed between the primary compression mechanism 101 and the secondary compression mechanism 102, a motor stator 3 is installed in the housing 10, a front bearing seat 4 is installed between the motor stator 3 and the secondary compression mechanism 102, a rear bearing seat 9 is installed between the motor stator 3 and the primary compression mechanism 101, and gaps are provided between the motor stator 3 and the front bearing seat 4 and the rear bearing seat 9; a motor rotor 5 is also installed in the housing 10, the front bearing seat 4 and the rear bearing seat 9 are respectively installed at both ends of the motor rotor 5, the motor stator 3 is arranged around the motor rotor 5, and a gap is provided between the motor rotor 5 and the motor stator 3. The motor rotor 5 generates a lot of heat during rotation, so it is necessary to carry out targeted cooling of the structure. To this end, gaps are provided between the motor stator 3 and the front bearing seat 4 and the rear bearing seat 9 , and a gap is provided between the motor rotor 5 and the motor stator 3 .

[0031] The purpose of setting the gaps and spaces is to avoid air flow. In order to facilitate the introduction of low-temperature air from the outside to cool the inside of the shell 10, an air inlet duct 103 is installed between the shell 10 and the motor base 1, and an air outlet duct 104 is installed on the shell 10. One end of the air outlet duct 104 is connected to the inside of the shell 10. However, the internal space of the shell 10 is small, which means that even if air flows for cooling, the contact area between the air and the internal structure is small, resulting in a small heat exchange area, which makes it difficult to cool the internal structure of the shell 10. For this reason, the present solution introduces an air cooling jacket 2. An air cooling jacket 2 is arranged between the housing 10 and the motor stator 3, the motor stator 3 is nested in the air cooling jacket 2, and a plurality of heat dissipation fins 221 are installed on the side wall of the air cooling jacket 2; an air inlet duct 103 is installed between the housing 10 and the motor base 1, and an air chamber 23 is arranged between the end of the air inlet duct 103 away from the motor base 1 and the air cooling jacket 2; an air outlet duct 104 is installed on the housing 10, and one end of the air outlet duct 104 is connected to the inside of the housing 10. The heat on the motor rotor 5 is transferred to the motor stator 3 through the front bearing seat 4 and the rear bearing seat 9, and then the motor stator 3 transfers the heat to the air cooling jacket 2, and the heat dissipation fins 221 on the air cooling jacket 2 further increase the heat dissipation area.

[0032] In the above mechanism, the air flow path is: air inlet duct 103 - air chamber 23 - air cooling jacket 2 - heat sink fins 221 - front bearing seat 4 - gap between motor stator 3 and motor rotor 5 - rear bearing seat 9 - air outlet duct 104 .

[0033] However, in this process, due to the small gap between the air cooling sleeve 2 and the front bearing seat 4, the air flow speed is slow and the heat dissipation effect is poor if it only relies on these gaps. To this end, the air cooling sleeve 2 includes a connected cooling section 22 and a ventilation section 21, the ventilation section 21 is located between the cooling section 22 and the front bearing seat 4, the air chamber 23 is located between the air inlet duct 103 and the cooling section 22, a plurality of heat dissipation fins 221 are arranged around the cooling section 22, and a plurality of ventilation holes 211 are arranged on the side wall of the ventilation section 21, and the ventilation holes 211 extend from the outer wall of the ventilation section 21 to the inner wall of the ventilation section 21. After entering the air chamber 23, the air reaches the ventilation section 21 through the gap between the heat dissipation fins 221, and then enters the gap between the motor rotor 5 and the motor stator 3 through two paths, namely, the ventilation holes 211 and the gap. The increase in the path increases the ventilation volume, thereby optimizing the cooling speed.

[0034] In this solution, the heat dissipation fins 221 are in the shape of long strips, and the length direction of the heat dissipation fins 221 is the same as the length direction of the air cooling jacket 2 .

[0035] In order to increase the heat dissipation efficiency, we need to increase the exchange area between the heat dissipation fins 221 and the air. For this purpose, the heat dissipation fins 221 are arc-shaped, and a plurality of the heat dissipation fins 221 are arranged in a spiral around the outer wall of the air cooling jacket 2. This design not only increases the heat exchange area between the air and the heat dissipation fins 221, but also increases the residence time of the air on the surface of the air cooling jacket 2, which enables the flowing air to fully exchange heat with the air cooling jacket 2, thereby ensuring the heat dissipation efficiency.

[0036] This solution is used for a small air suspension device. In order to further reduce the overall weight, a plurality of grooves 31 are provided on the outer wall of the motor stator 3. The length direction of the plurality of grooves 31 is the same as the length direction of the motor stator 3. The plurality of grooves 31 are evenly arranged around the motor stator 3. The evenly distributed grooves 31 in this design not only reduce the total weight of the motor stator 3, but also increase the heat dissipation area.

[0037] If the cooling is only carried out by the natural flow of air, the air flow rate is still slow. Therefore, the end of the motor rotor 5 away from the front bearing seat 4 passes through the rear bearing seat 9, and the end of the motor rotor 5 away from the front bearing seat 4 is equipped with a plurality of fan blades 7, and the air outlet duct 104 is arranged in cooperation with the fan blades 7. When the fan blades 7 rotate, positive and negative pressures are formed between the air inlet duct 103 and the air outlet duct 104, which provides power for the air flow and accelerates the air flow rate.

[0038] In order to prevent the air entering from the air inlet duct 103 from reaching the outside through the air outlet duct 104 before heat exchange with the motor rotor 5 occurs, a fan cover 6 is installed between the fan blade 7 and the rear bearing seat 9, the motor rotor 5 passes through the fan cover 6, and a gap is provided between the motor rotor 5 and the fan cover 6, and the end of the fan cover 6 facing the rear bearing seat 9 is concave toward the end of the fan cover 6 away from the rear bearing seat 9 to form an arc-shaped concave surface. This design allows the fan cover 6 to isolate the air inlet duct 103 from the air outlet duct 104, so that the air can only flow along the preset route, ensuring sufficient heat dissipation.

[0039] Preferably, the side edge of the fan cover 6 is connected to the inner wall of the housing 10 , and the side edge of the fan cover 6 is located between the air inlet duct 103 and the air outlet duct 104 .

[0040] In order to prevent foreign matter from entering the housing 10 and causing damage to the fan blades 7, a sealing cover plate 8 is installed at one end of the housing 10. The sealing cover plate 8 is located on the side of the fan blades 7 away from the rear bearing seat 9.

[0041] In this solution, the motor rotor 5 adopts a shaft structure in the form of an integrated embedded magnetic steel.

[0042] In summary, this solution has the following advantages: First, through the dual-channel negative pressure fan cooling cycle structure, the traditional positive pressure cooling fan will increase the pressure of the cooling air while delivering cooling air, which will cause the temperature of the cooling air to rise. Using a negative pressure fan will not increase the internal pressure of the motor, will not increase the temperature of the cooling air, and will directly extract a large amount of heat from the inside of the motor. Second, the present invention abandons the traditional water-cooling cooling system, greatly simplifies the overall structure of the product, and ensures the reliability of the long-term operation of the equipment. The use of a negative pressure cooling fan cooling method not only solves the problem that the high-pressure ratio centrifugal compressor pressurization temperature is too high and cannot be cooled down, but also the cooling flow required by the negative pressure cooling fan cooling cycle system is small and the energy loss is small.

[0043] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present invention.

Claims

1. A high-pressure ratio air-cooled two-stage supercharged air suspension centrifugal compressor, characterized in that: The invention comprises a motor base (1), one end of which is mounted with a compressor body, the compressor body comprising a primary compression mechanism (101) and a secondary compression mechanism (102), a shell (10) being mounted between the primary compression mechanism (101) and the secondary compression mechanism (102), a motor stator (3) being mounted in the shell (10), a front bearing seat being mounted between the motor stator (3) and the secondary compression mechanism (102), a rear bearing seat (9) being mounted between the motor stator (3) and the primary compression mechanism (101), and gaps being arranged between the motor stator (3) and the front bearing seat (4) and the rear bearing seat (9); a motor rotor (5) being mounted in the shell (10), the front bearing seat (4) and the rear bearing seat (9) They are respectively installed at both ends of the motor rotor (5), the motor stator (3) is arranged around the motor rotor (5), and a gap is arranged between the motor rotor (5) and the motor stator (3); an air cooling jacket (2) is arranged between the housing (10) and the motor stator (3), the motor stator (3) is nested in the air cooling jacket (2), and a plurality of heat dissipation fins (221) are installed on the side wall of the air cooling jacket (2); an air inlet duct (103) is installed between the housing (10) and the motor base (1), and an air chamber (23) is arranged between one end of the air inlet duct (103) away from the motor base (1) and the air cooling jacket (2); an air outlet duct (104) is installed on the housing (10), and one end of the air outlet duct (104) is connected to the inside of the housing (10); The air cooling jacket (2) comprises a cooling section (22) and a ventilation section (21) which are connected to each other, the ventilation section (21) being located between the cooling section (22) and the front bearing seat (4), the air chamber (23) being located between the air inlet duct (103) and the cooling section (22), a plurality of heat dissipation fins (221) being arranged around the cooling section (22), a plurality of ventilation holes (211) being arranged on the side wall of the ventilation section (21), the ventilation holes (211) extending from the outer wall of the ventilation section (21) toward the inner wall of the ventilation section (21); The end of the motor rotor (5) away from the front bearing seat (4) passes through the rear bearing seat (9), and a plurality of fan blades (7) are installed on the end of the motor rotor (5) away from the front bearing seat (4), and the air outlet duct (104) is arranged in coordination with the fan blades (7); A fan cover (6) is installed between the fan blade (7) and the rear bearing seat (9), the motor rotor (5) passes through the fan cover (6), and a gap is provided between the motor rotor (5) and the fan cover (6), and one end of the fan cover (6) facing the rear bearing seat (9) is recessed toward one end of the fan cover (6) away from the rear bearing seat (9) to form an arc-shaped concave surface; A plurality of grooves (31) are arranged on the outer wall of the motor stator (3); the length direction of the plurality of grooves (31) is the same as the length direction of the motor stator (3); and the plurality of grooves (31) are evenly arranged around the motor stator (3).

2. The high-pressure ratio air-cooled two-stage boosted air suspension centrifugal compressor according to claim 1 is characterized in that: The side edge of the fan cover (6) is connected to the inner wall of the housing (10), and the side edge of the fan cover (6) is located between the air inlet duct (103) and the air outlet duct (104).

3. The high-pressure ratio air-cooled two-stage boosted air suspension centrifugal compressor according to claim 2, characterized in that: A sealing cover plate (8) is installed at one end of the housing (10), and the sealing cover plate (8) is located on a side of the fan blade (7) away from the rear bearing seat (9).

4. The high-pressure ratio air-cooled two-stage boosted air suspension centrifugal compressor according to claim 1, characterized in that: The heat dissipation fins (221) are in the shape of long strips, and the length direction of the heat dissipation fins (221) is the same as the length direction of the air cooling jacket (2).

5. The high-pressure ratio air-cooled two-stage boosted air suspension centrifugal compressor according to claim 1, characterized in that: The heat dissipation fins (221) are arc-shaped, and a plurality of the heat dissipation fins (221) are arranged in a spiral around the outer wall of the air cooling jacket (2).

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