CN116163968A

CN116163968A - Direct-drive double-suction centrifugal compressor

Info

Publication number: CN116163968A
Application number: CN202310251653.6A
Authority: CN
Inventors: 曹正旭; 林伟伟; 陈健; 徐晨; 肖旭
Original assignee: Shanghai Youshe Power Technology Co ltd
Current assignee: Shanghai Youshe Power Technology Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-05-26

Abstract

The invention provides a direct-drive double-suction centrifugal compressor, relates to the technical field of compressors, and solves the technical problem that in the prior art, a centrifugal air compressor is easy to cause unbalanced axial force of a main shaft of a direct-drive motor. The compressor comprises a permanent magnet motor, wherein a left volute and a right volute are respectively connected to the left side and the right side of the permanent magnet motor, a left impeller and a right impeller are respectively arranged on the left side and the right side of a main shaft rotor of the permanent magnet motor, the left impeller is arranged in the left volute, the right impeller is arranged in the right volute, and the sizes and the weights of the left impeller and the right impeller are consistent. Therefore, centrifugal impellers are simultaneously arranged at two ends of a main shaft of a high-speed permanent magnet motor, and a left impeller, a right impeller and main shaft rotors of the permanent magnet motor are directly connected into an integral system, so that the structural layout of a product is compact, the sizes and the weights of the two centrifugal impellers are consistent, and the axial forces at two ends of the main shaft can be balanced better, so that the stability of a compressor system is improved.

Description

Direct-drive double-suction centrifugal compressor

Technical Field

The invention relates to the technical field of compressors, in particular to a direct-drive double-suction centrifugal compressor.

Background

Centrifugal compressors are machines that produce pressure, and are speed compressors, also known as turbo compressors, in which the movement of the gas in the centrifugal compressor is in a radial direction perpendicular to the compressor shaft. In order to achieve the aim of shortening the distance between gas molecules and increasing the pressure of the gas, a gas dynamic method is adopted, namely, a mechanical acting element (an impeller rotating at a high speed) is utilized to apply work to the gas, so that the pressure of the gas is increased under the action of centrifugal force, meanwhile, the kinetic energy is greatly increased, and then the kinetic energy is converted into static pressure energy in a diffusion flow passage, so that the pressure of the gas is further increased, and the working principle of a centrifugal compressor is adopted.

Centrifugal compressors are widely used in national industrial production, and in actual production activities, pursuits of research and development personnel are consistent with demands of clients, and the higher the flow of the compressor and the higher the pressure of the compressor are under the rated power of a single compressor, the higher the efficiency of the compressor is. In order to meet the actual demands of larger flow and higher pressure, the general design ideas of the researchers are two: firstly, the rotating speed of the compressor is designed to be higher; and secondly, the size of the impeller is larger. However, both of these methods bring a series of new problems, for example, the linear speed of the impeller is high, the material strength of the impeller is tested, the mode of the rotating shaft is changed, and the critical rotating speed of the rotating shaft is strictly required. It is known that in the full-power section of the direct-drive permanent magnet motor, the motor efficiency is very high, and the transmission efficiency of the main shaft reaches the highest because the main shaft and the impeller work in a direct-connection mode. The application method of the direct-drive permanent magnet motor in the industry is as follows: (1) One end is provided with a first-stage impeller, which is the design idea of a high-flow and low-pressure blower; (2) Impellers are arranged at two ends, one end is provided with a primary impeller, and the other end is provided with a secondary impeller, so that the design idea of the compressor with small flow and high pressure is realized.

However, at least the following problems exist in the direct-drive centrifugal air compressor at present:

(1) Whether one end is provided with an impeller or both ends are provided with impellers; the size of the working impellers at the two ends of the main shaft is unequal, and the weights of the impellers are different, so that the balance force of the main shaft is difficult to accurately control, the bearing selected and arranged for bearing the main shaft needs good bearing capacity, and the bearing or the main shaft can be burnt out due to unbalance of the axial force of the main shaft.

(2) In order to balance the flow and the pressure of the compressor, the compressor cannot meet the highest demand of a single quantity, and the high-efficiency direct-drive permanent magnet motor is wasted.

Disclosure of Invention

The invention aims to provide a direct-drive double-suction centrifugal compressor, which is used for solving the technical problem that in the prior art, a centrifugal air compressor is easy to have unbalanced axial force of a main shaft of a direct-drive motor. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the invention provides a direct-drive double-suction centrifugal compressor, which comprises a permanent magnet motor, wherein the left side and the right side of the permanent magnet motor are respectively connected with a left volute and a right volute, the left side and the right side of a main shaft rotor of the permanent magnet motor are respectively provided with a left impeller and a right impeller, wherein the left impeller is arranged in the left volute, the right impeller is arranged in the right volute, and the sizes and the weights of the left impeller and the right impeller are consistent.

According to a preferred embodiment, the left impeller and the right impeller are respectively connected to the left and right ends of the main shaft rotor in such a manner that the blades are rotated in opposite directions.

According to a preferred embodiment, a left air inlet deflector is arranged on the left volute, and the left air inlet deflector is communicated with the inside of the left volute so that medium gas enters a compressor chamber through the left air inlet deflector, is accelerated and pressurized by the left impeller, and is discharged through the left volute.

According to a preferred embodiment, a right air inlet deflector is arranged on the right volute, and the right air inlet deflector is communicated with the right volute so that medium gas enters a compressor chamber through the right air inlet deflector, is accelerated and pressurized by the right impeller, and is discharged through the right volute.

According to a preferred embodiment, the ends of the left volute and the right volute are connected with an exhaust tee.

According to a preferred embodiment, the permanent magnet motor further comprises a motor housing, and a motor stator and the spindle rotor are sequentially arranged in the motor housing from outside to inside.

According to a preferred embodiment, the motor housing is connected to the left end of the spindle rotor by a left bearing, and the motor housing is connected to the right end of the spindle rotor by a right bearing.

According to a preferred embodiment, the left and right volutes are each bolted to the motor housing.

According to a preferred embodiment, a left sealing body is provided on the contact surface of the left end of the motor housing with the left volute, said left sealing body being arranged on the spindle rotor closer to the inside than the left impeller.

According to a preferred embodiment, a right sealing body is provided on the contact surface of the right end of the motor housing with the right volute, so that the right sealing body is arranged on the spindle rotor closer to the inside than the right impeller.

Based on the technical scheme, the direct-drive double-suction centrifugal compressor has at least the following technical effects:

the direct-drive double-suction centrifugal compressor comprises a permanent magnet motor, wherein a left volute and a right volute are respectively connected to the left side and the right side of the permanent magnet motor, a left impeller and a right impeller are respectively arranged on the left side and the right side of a main shaft rotor of the permanent magnet motor, the left impeller is arranged in the left volute, the right impeller is arranged in the right volute, and the sizes and the weights of the left impeller and the right impeller are consistent. Therefore, centrifugal impellers are simultaneously arranged at two ends of a main shaft of a high-speed permanent magnet motor, and a left impeller, a right impeller and main shaft rotors of the permanent magnet motor are directly connected into an integral system, so that the structural layout of a product is compact, the sizes and the weights of the two centrifugal impellers are consistent, and the axial forces at two ends of the main shaft can be balanced better, so that the stability of a compressor system is improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a main shaft rotor in a direct drive double suction centrifugal compressor according to the present invention;

FIG. 2 is a cross-sectional view of a direct drive dual suction centrifugal compressor of the present invention;

fig. 3 is a schematic view of the external structure of the direct-drive double suction centrifugal compressor of the present invention.

In the figure: 1-left impeller; 2-spindle rotor; 3-right impeller; 4-left bearing; 5-left sealing body; 6-a motor stator; 7-a motor housing; 8-right bearing; 9-right seal; 10-left inlet air guider; 11-right intake inducer; 12-left volute; 13-right volute; 14-an exhaust tee; 15-permanent magnet motor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.

The technical scheme of the invention is described in detail below with reference to the attached drawings.

As shown in fig. 1 to 3, the invention provides a direct-drive double-suction centrifugal compressor, which comprises a permanent magnet motor 15, wherein a left volute 12 and a right volute 13 are respectively connected to the left side and the right side of the permanent magnet motor 15. The left and right sides of the main shaft rotor 2 of the permanent magnet motor 15 are respectively provided with a left impeller 1 and a right impeller 3, wherein the left impeller 1 is arranged in a left volute 12, the right impeller 3 is arranged in a right volute 13, and the sizes and the weights of the left impeller 1 and the right impeller 3 are consistent. Through installing centrifugal impeller simultaneously at a high-speed permanent magnet machine's main shaft both ends, left impeller, right impeller and permanent magnet machine's main shaft rotor allies oneself with directly to an overall system for product structural layout is compact, and the size and the weight of two centrifugal impeller are unanimous, and the axial force at main shaft both ends can be better realize the balance, thereby has improved compressor system's stability.

Further preferably, the left impeller 1 and the right impeller 3 are respectively connected to the left and right ends of the main shaft rotor 2 in such a manner that the vane directions are opposite. It can be understood that when the main shaft rotor 2 synchronously drives the left impeller 1 and the right impeller 3 to rotate, the blades of the left impeller 1 and the right impeller 3 rotate in opposite directions. When the motor rotates, the centrifugal impeller at one end rotates anticlockwise, and the centrifugal impeller at the other end rotates clockwise.

Further preferably, a left air intake deflector 10 is arranged on the left volute 12, and the left air intake deflector 10 is communicated with the inside of the left volute 12, so that medium gas enters a compressor chamber through the left air intake deflector 10, is accelerated by the left impeller 1, is pressurized and is discharged through the left volute 12. The right volute 13 is provided with a right air inlet deflector 11, and the right air inlet deflector 11 is communicated with the right volute 13 so that medium gas enters a compressor chamber through the right air inlet deflector 11 and is discharged through the right volute 13 after being accelerated and pressurized by the right impeller 3. Preferably, the ends of the left and

right volutes

12 and 13 are connected with an exhaust tee 14.

Therefore, the working medium gas enters the compressor chamber through the left air inlet flow director 10, and under the rotation work of the left impeller 1, the medium gas is subjected to the speed-increasing and pressure-increasing process, so that the medium gas can improve the kinetic energy and the pressure energy, is discharged through the left volute, and finally is collected to the main pipe network through the exhaust three-way pipe. Meanwhile, working medium gas enters a compressor chamber through the right air inlet flow director 11, under the rotation of the right impeller 3, the medium gas is subjected to the speed-increasing and pressure-increasing process, so that the medium gas can increase kinetic energy and pressure energy, is discharged through the right volute, and finally is collected to a main pipe network through an exhaust three-way pipe.

Further preferably, as shown in fig. 2 and 3, the permanent magnet motor 15 further includes a motor housing 7, and a motor stator 6 and a spindle rotor 2 are sequentially disposed inside the motor housing 7 from outside to inside. The motor housing 7 is connected with the left end of the spindle rotor 2 through the left bearing 4, and the motor housing 7 is connected with the right end of the spindle rotor 2 through the right bearing 8. So as to support the spindle rotor 2 through the left bearing 4 and the right bearing 8. Preferably, the left and

right volutes

12 and 13 are each bolted to the motor housing 7. A left seal 5 is provided at the contact surface between the left end of the motor housing 7 and the left scroll 12, and the left seal 5 is provided inside the main shaft rotor 2 closer to the left impeller 1. A right seal 9 is provided at the right end portion of the motor housing 7 and at the contact surface with the right scroll casing 13, and the right seal 9 is provided inside the main shaft rotor 2 closer to the right impeller 3. The left sealing body 5 and the right sealing body 9 respectively play a role of sealing and are used for preventing medium gas from entering the inner cavity of the motor.

According to the direct-drive double-suction centrifugal compressor, centrifugal impellers with the same size and weight are simultaneously arranged at two ends of the main shaft rotor of the high-speed permanent magnet motor, and the rotation directions of blades of the two impellers are opposite, so that the left impeller, the right impeller and the main shaft rotor of the motor can be directly connected into a system, the structural layout of a product is compact, the balance of axial forces at two ends of the main shaft is better realized, and the stability of a compressor system is improved. When the motor spindle rotor works, the left impeller and the right impeller are driven to rotate simultaneously, gas generated by the impellers at the two ends is collected into the exhaust three-way pipe and then is conveyed to the client side together for gas consumption, and the gas consumption requirement is met. The direct-drive double-suction centrifugal compressor solves the problem of unbalanced axial force of the main shaft of the direct-drive motor, and simultaneously pursues the maximum requirement of single variable of the compressor, namely, the parallel operation is realized at two ends of a single centrifugal compressor instead of the parallel operation of two compressors, so that the problem of contradiction between large-flow supply and demand of the compressors can be better solved.

In the description of the present invention, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a direct-drive double-suction centrifugal compressor, its characterized in that, includes permanent magnet motor (15) the left and right sides of permanent magnet motor (15) is connected left spiral case (12) and right spiral case (13) respectively, the left and right sides of main shaft rotor (2) of permanent magnet motor (15) are equipped with left impeller (1) and right impeller (3) respectively, wherein, left impeller (1) set up in left spiral case (12), right impeller (3) set up in right spiral case (13), just left impeller (1) with the size and the weight of right impeller (3) are unanimous.

2. The direct-drive double suction centrifugal compressor according to claim 1, wherein the left impeller (1) and the right impeller (3) are respectively connected to the left and right ends of the main shaft rotor (2) in such a manner that the vane directions are opposite.

3. The direct-drive double-suction centrifugal compressor according to claim 2, wherein a left air intake deflector (10) is arranged on the left volute (12), and the left air intake deflector (10) is communicated with the inside of the left volute (12) so that medium gas enters a compressor chamber through the left air intake deflector (10) and is discharged through the left volute (2) after being accelerated and pressurized by the left impeller (1).

4. A direct-drive double suction centrifugal compressor according to claim 3, wherein a right intake inducer (11) is provided on the right scroll (13), the right intake inducer (11) being in communication with the right scroll (13) for allowing a medium gas to enter the compressor chamber through the right intake inducer (11) and to be discharged through the right scroll (13) after being accelerated and pressurized by the right impeller (3).

5. The direct-drive double suction centrifugal compressor according to claim 4, wherein the tail ends of the left volute (2) and the right volute (3) are connected with an exhaust three-way pipe (14).

6. The direct-drive double suction centrifugal compressor according to claim 1, wherein the permanent magnet motor (15) further comprises a motor housing (7), and a motor stator (6) and the main shaft rotor (2) are sequentially arranged in the motor housing (7) from outside to inside.

7. The direct-drive double suction centrifugal compressor according to claim 6, wherein the motor housing (7) is connected with the left end of the main shaft rotor (2) through a left bearing (4), and the motor housing (7) is connected with the right end of the main shaft rotor (2) through a right bearing (8).

8. The direct drive double suction centrifugal compressor according to claim 7, wherein the left scroll casing (12) and the right scroll casing (13) are fixed to the motor housing (7) by bolts, respectively.

9. The direct-drive double suction centrifugal compressor according to claim 8, characterized in that a left sealing body (5) is provided on the contact surface of the left end portion of the motor housing (7) and the left volute (12), and the left sealing body (5) is arranged on the main shaft rotor (2) closer to the inside than the left impeller (1).

10. The direct-drive double suction centrifugal compressor according to claim 8, characterized in that a right sealing body (9) is provided on the contact surface of the right end portion of the motor housing (7) and the right scroll casing (12), the right sealing body (9) being provided on the main shaft rotor (2) closer to the inside than the right impeller (3).