Air inlet compensation device for centrifugal compressor

Abstract

The utility model discloses an air inlet compensation device for a centrifugal compressor, and relates to the field of centrifugal compressors. The device is mainly composed of a wake flow correction pipe, a main flow pipe, a bearing, a motor, a rotating body, an impeller, a shell, a filter screen and the like, the wake flow correction pipe is connected with the main flow pipe through a sleeve, the shell and the main flow pipe are sealed through a sealing ring, and the impeller, the rotating body and the motor are sequentially nested and fixed to the main flow pipe through the bearing. All main parts in the device share the same central axis, so that the overall layout is reasonable, and the structure is compact. When the air pressure of an inlet of the centrifugal compressor is low, the device can increase the air inflow of the centrifugal compressor through the auxiliary flow channel, so that the centrifugal compressor works under the designed working condition with the highest efficiency; when the inlet air pressure of the centrifugal compressor meets the designed working condition value, the device can stop working under the condition that the original air inlet mode is not affected. The motor type and the impeller type in the device can be replaced according to different working scenes, and the application range of the device is greatly widened.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal compressors, in particular to an air intake compensation device for centrifugal compressors. Background Art

[0002] As a green and efficient energy supply device, hydrogen fuel cells have been widely used in various new energy vehicles in recent years. As one of the core devices of hydrogen fuel cells, centrifugal compressors have the characteristics of compact structure and high compression efficiency. The high-pressure gas they provide directly participates in the electrochemical reaction and affects the output power of hydrogen fuel cells.

[0003] The working environment of hydrogen fuel cells installed in new energy vehicles is complex and changeable, which usually causes the centrifugal compressor to deviate from the designed working conditions. When the centrifugal compressor operates under low inlet pressure conditions, surge will occur, which will not only affect the vehicle power, but also cause irreversible damage to the hydrogen fuel cell in severe cases. Utility Model Content

[0004] In order to solve the problems existing in the above-mentioned background technology, the utility model provides an intake compensation device for a centrifugal compressor to maintain a constant inlet gas pressure of the centrifugal compressor and ensure safe and efficient operation of the hydrogen fuel cell.

[0005] To achieve the above purpose, the utility model is implemented through the following scheme:

[0006] An air intake compensation device for a centrifugal compressor mainly comprises a wake correction pipe, a sleeve, a main flow pipe, a sealing ring, a casing, a filter, an impeller, a rotor, a motor and a bearing. The wake correction pipe is connected to the main flow pipe through a sleeve, the casing and the main flow pipe are sealed through a sealing ring, and the impeller, the rotor and the motor are nested in sequence and fixed to the main flow pipe through bearings.

[0007] The air inlet end of the wake correction pipe is processed with threaded holes evenly distributed along the circumference of the pipe, the number of which is 4-12; the air outlet end is processed with evenly distributed guide strips, the number of which is 4-12; one end processed with the guide strip is provided with two threaded holes with a center line parallel to the guide strip, and a through hole is provided between the two.

[0008] The main pipe outlet end is provided with two rows of threaded holes evenly distributed along the circumference of the pipe, with 4-12 holes in each row; the middle section is processed with rounded rectangular holes, with 4-12 holes in number; the air inlet end is processed with two-stage continuous bosses, with a retaining ring groove at each end of the boss.

[0009] The inner wall surface of the small-diameter end of the shell is processed with a groove, and the cross-section of the large-diameter end is processed with threaded holes, the number of which is 4-12.

[0010] The bearing is composed of an inner ring, a ball and an outer ring; the motor is composed of a coil, a stator, a shell and a neodymium magnet; the coil is wound around the stator, and the neodymium magnet is glued to the shell.

[0011] The impeller is processed with an odd number of individual blades; the blades are processed with countersunk holes in the axial direction, the cross-sectional shape of the blades can be elliptical, wing-shaped and wedge-shaped, and the blade form can be forward, radial and backward.

[0012] The inner wall of the rotating body is processed with a multi-step boss and two retaining ring grooves, the air inlet end of the outer wall is processed with a boss, and the air outlet end is processed with screw holes, and the number of screw holes is 4-12.

[0013] The inner diameter of the filter is larger than the outer diameter of the mainstream pipe, and the outer diameter is smaller than the inner diameter of the large-diameter end of the shell; the inner diameter end of the filter is processed with multiple circles of through holes, and the outer diameter end is processed with a circle of fan-shaped through holes and a combination of circular through holes, and the number of the combinations is 4-12.

[0014] The cavity formed by the wake correction pipe and the main flow pipe constitutes a main flow channel, and the cavity formed by the housing, the impeller, the rotating body bearing and the rounded rectangular hole of the main flow pipe constitutes an auxiliary flow channel.

[0015] Compared with the prior art, the utility model has the following beneficial technical effects:

[0016] (1) The main parts of the utility model are designed and installed with the same central axis, and have the advantages of simple structure, compact size, reliable design, reasonable layout, etc., and are particularly suitable for the field of centrifugal compressors.

[0017] (2) The device provided by the utility model has a main flow channel and an auxiliary flow channel constructed inside. The main flow channel ensures that the original air intake method of the centrifugal compressor remains unchanged, and the auxiliary flow channel can assist the centrifugal compressor in air intake under low pressure conditions.

[0018] (3) The impeller in the utility model can be freely replaced according to different usage scenarios, which greatly broadens the scope of use of the device.

[0019] (4) The guide strips in the wake correction tube of the utility model can correct the airflow direction so that the uncompressed gas enters the centrifugal compressor in a uniform and stable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A transverse cross-sectional view of an air intake compensation device for a centrifugal compressor according to the present invention

[0021] Figure 2 A schematic diagram of a sensor for an air intake compensation device for a centrifugal compressor according to the present invention

[0022] Figure 3 A schematic diagram of a bearing of an air intake compensation device for a centrifugal compressor according to the present invention

[0023] Figure 4 A schematic diagram of a motor for an air intake compensation device for a centrifugal compressor according to the present invention

[0024] Figure 5 Schematic diagram of the installation of the impeller and the rotating body of the air intake compensation device for a centrifugal compressor of the present invention

[0025] Figure 6 A schematic diagram of a baffle of an intake compensation device for a centrifugal compressor according to the present invention

[0026] The reference numerals are as follows:

[0027] 1. Wake correction tube; 2. Sleeve; 3. Main flow tube; 4. Sealing ring; 5. Shell; 6. Circlip 1; 7. Circlip 2; 8. Screw group 1; 9. Inner ring; 10. Ball; 11. Outer ring; 12. Circlip 3; 13. Sleeve 2; 14. Circlip 4; 15. Screw group 2; 16. Filter; 17. Coil; 18. Stator; 19. Shell; 20. Neodymium magnet; 21. Impeller; 22. Rotor; 23. Screw group 3; 24. Screw group 4; 25. Screw group 5; 26. Screw group 6; 27. Pressure transmitter DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] The following is combined with Figure 1-6 The utility model is described in further detail.

[0031] The utility model provides an air intake compensation device for a centrifugal compressor, such as Figure 1As shown, it mainly includes a wake correction pipe 1, a sleeve 2, a main flow pipe 3, a sealing ring 4, a casing 5, an impeller 21, a rotating body 22, a motor and a bearing. The wake correction pipe is connected to the main flow pipe through a sleeve, and the casing and the main flow pipe are sealed through a sealing ring. The impeller, the rotating body and the motor are nested in sequence and fixed to the main flow pipe through bearings.

[0032] like Figure 1 As shown, the inlet end of the wake correction pipe 1 is processed with threaded holes evenly distributed along the circumference of the pipe, the number of which is 4-12; the outlet end is processed with evenly distributed guide strips, the number of which is 4-12; one end processed with the guide strip is opened with two threaded holes whose center line is parallel to the guide strip, and a through hole is opened between the two.

[0033] like Figure 2 As shown, the middle columnar pressure measuring device of the pressure transmitter 27 can be replaced according to different application occasions, and is fixedly connected to the wake correction pipe 1 through a screw group 26 .

[0034] like Figure 1 As shown, the outlet end of the main pipe 3 is provided with two rows of threaded holes evenly distributed along the circumference of the pipe, with 4-12 holes in each row; the middle section is processed with rounded rectangular holes, with 4-12 holes in number; the outer surface of the inlet end is processed with two-stage continuous bosses, and a retaining ring groove is processed at each end of the boss.

[0035] like Figure 1 As shown, the tail pipe 1 is connected and fixed to the main pipe 3 by means of a sleeve 2, a screw group 24 and a screw group 25; the length of the tail pipe can be adjusted according to the application occasion while keeping the characteristic structure unchanged.

[0036] like Figure 1 As shown, the inner wall surface of the small-diameter end of the shell 5 is processed with a groove, and the cross-section of the large-diameter end is processed with threaded holes, the number of which is 4-12.

[0037] like Figure 1 As shown, the housing 5 is installed on the outer surface of the main pipe 3 and fixed by a screw group 23. The sealing ring 4 is installed in the groove of the housing 5 to improve the air tightness of the device and prevent gas leakage.

[0038] like Figure 3 As shown, the bearing is composed of an inner ring 9, balls 10 and an outer ring 11. Compared with the national standard bearing, the bearing is widened in the radial direction and has excellent load-bearing capacity, stable operation and service life.

[0039] like Figure 4As shown, the motor is composed of a coil 17, a stator 18, a shell 19 and a neodymium magnet 20. The coil 17 is wound around the stator 18, and the neodymium magnet 20 is glued to the shell 19. The motor adopts a 12N14P structure, which can be replaced with other structures such as 24N28P, 36N42P, etc. according to the usage scenario. It is easy to control and compatible with common drivers. The motor adopts a split design and no output shaft is set. After the stator 18 is fixed, the torque is directly output by the shell 19 as a carrier.

[0040] like Figure 5 As shown, the impeller 21 is processed with an odd number of individual blades and a countersunk hole is processed axially; the cross-sectional shape of the blades can be elliptical, wing-shaped and wedge-shaped, and the blade form can be forward, radial and backward, and can be selected and replaced according to different usage scenarios.

[0041] like Figure 1 As shown, the inner wall of the rotating body 22 is processed with a multi-step boss and two retaining ring grooves, the air inlet end of the outer wall is processed with a boss, and the air outlet end is processed with screw holes, and the number of screw holes is 4-12.

[0042] like Figure 5 As shown, the impeller 21 is nested in the outer wall of the rotating body 22, the boss on the outer wall of the rotating body 22 limits the impeller 21, and the screw group 8 fixes the impeller 21 and the rotating body 22.

[0043] like Figure 1 As shown, the main flow pipe 3 contacts the inner diameter surface of the bearing inner ring 9 and is fixed by the retaining spring 6; the rotating body 22 contacts the outer diameter surface of the bearing outer ring 11 and is fixed by the retaining spring 7; the main flow pipe 3 and the rotating body 22 are fixed to the same bearing, and the two form a relative rotation relationship; the inner diameter surface of the motor stator 18 contacts the main flow pipe 3 and is fixed by the sleeve 13 and the retaining spring 14; the outer diameter surface of the motor housing 19 contacts the rotating body 22 and is fixed by the retaining spring 12; after the motor coil 17 is connected to the control current, an alternating magnetic field is generated, which interacts with the magnetic field of the neodymium magnet 20 itself, so that the main flow pipe 3 and the rotating body 22 rotate relative to each other, thereby causing the impeller 21 to rotate and do work.

[0044] like Figure 6 As shown, the inner diameter of the filter screen 16 is larger than the outer diameter of the mainstream pipe 3, and the outer diameter is smaller than the inner diameter of the large-diameter end of the shell 5; the inner diameter end of the filter screen 16 is processed with multiple circles of through holes, and the outer diameter end is processed with a circle of fan-shaped through holes and a combination of circular through holes, and the number of the combinations is 4-12.

[0045] like Figure 1 As shown, the filter screen 16 is installed on the large-diameter end of the housing 5 and fixed by a screw group 15.

[0046] like Figure 1As shown, the cavity formed by the wake correction pipe 1 and the main flow pipe 3 constitutes a main flow channel, and the cavity formed by the housing 5, the impeller 21, the bearing of the rotor 22 and the rounded rectangular hole of the main flow pipe 3 constitutes an auxiliary flow channel.

[0047] The working principle of the utility model is: the centrifugal compressor air intake compensation device is started synchronously with the centrifugal compressor, and the pressure transmitter detects the gas pressure at the outlet of the air intake compensation device in real time. When the gas pressure value is lower than the set value, the motor starts and drives the impeller to rotate, so that the additional gas passes through the auxiliary flow channel and merges into the main flow channel, and forms a mixed flow airflow with the gas in the main flow channel; the mixed flow airflow tends to be stable after passing through the guide strip near the outlet end, and finally enters the centrifugal compressor.

[0048] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. An intake compensation device for a centrifugal compressor, mainly comprising a wake correction pipe (1), a sleeve (2), a main flow pipe (3), a sealing ring (4), a housing (5), a filter (16), an impeller (21), a rotating body (22), a motor and a bearing, characterized in that: The wake correction pipe is connected to the main flow pipe through a sleeve, the outer shell and the main flow pipe are sealed through a sealing ring, and the impeller, the rotating body and the motor are nested in sequence and fixed to the main flow pipe through bearings.

2. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The wake correction pipe (1) has 4-12 threaded holes evenly distributed along the circumference of the pipe processed at the air inlet end; 4-12 guide strips evenly distributed at the air outlet end; and two threaded holes with a center line parallel to the guide strip are formed at one end with the guide strip, and a through hole is formed between the two threaded holes.

3. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The outlet end of the main pipe (3) is provided with two rows of threaded holes evenly distributed along the circumference of the pipe, with 4 to 12 holes in each row; the middle section is processed with rounded rectangular holes, with 4 to 12 holes in number; the inlet end is processed with two-stage continuous bosses, with a retaining ring groove at each end of the boss.

4. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The inner wall surface of the small-diameter end of the shell (5) is processed with a groove, and the cross-section of the large-diameter end is processed with threaded holes, the number of which is 4 to 12.

5. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The bearing is composed of three parts: an inner ring (9), a ball (10) and an outer ring (11); the motor is composed of a coil (17), a stator (18), a housing (19) and a neodymium magnet (20); the coil (17) is wound around the stator (18), and the neodymium magnet (20) is glued to the housing (19).

6. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The impeller (21) is processed with an odd number of individual blades and a countersunk hole is processed in the axial direction; the cross-sectional shape of the blades can be elliptical, wing-shaped and wedge-shaped, and the blade form can be forward, radial and backward.

7. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The inner wall of the rotating body (22) is processed with a multi-step boss and two retaining ring grooves, the air inlet end of the outer wall is processed with a boss, and the air outlet end is processed with screw holes, and the number of screw holes is 4-12.

8. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The inner diameter of the filter screen (16) is larger than the outer diameter of the main pipe (3), and the outer diameter is smaller than the inner diameter of the large-diameter end of the outer shell (5); the inner diameter end of the filter screen (16) is processed with a plurality of circles of through holes, and the outer diameter end is processed with a circle of a combination of fan-shaped through holes and circular through holes, and the number of the combinations is 4-12.

9. The air intake compensation device for a centrifugal compressor according to claim 1, characterized in that: The cavity formed by the wake correction pipe (1) and the main flow pipe (3) constitutes a main flow channel, and the cavity formed by the housing (5), the impeller (21), the bearing of the rotor (22) and the rounded rectangular hole of the main flow pipe (3) constitutes an auxiliary flow channel.

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