Secondary cooling structure of motor rotor of compressor

Abstract

This utility model relates to a two-stage cooling structure for the motor rotor of a compressor, comprising a front housing and a rear housing mounted together from left to right. A cooling inlet is connected to the right side of the motor cooling cavity located inside the motor housing. A high-pressure hot gas outlet is connected to the right side of the main compression flow channel. The high-pressure hot gas outlet is connected to a cooler via a high-pressure hot gas connecting pipe, and the cooling inlet is connected to the cooler via a cooling inlet connecting pipe. Several guide vanes are evenly distributed along the circumference on the right side of the impeller, and a drain outlet connected to the motor cooling cavity is provided on the left side of the motor housing. This utility model utilizes the high-pressure hot gas compressed by the compressor, which, after cooling, effectively cools the surface of the motor stator and rotor assembly, forming a closed gas circulation path inside the compressor, avoiding high-temperature accumulation and improving equipment operational reliability.

Description

Technical Field

[0001] This utility model relates to the technical field of compressor cooling, and in particular to a two-stage cooling structure for the motor rotor of a compressor. Background Technology

[0002] In high-speed compressors, the motor and rotor generate a lot of heat during long-term operation. If the cooling is insufficient, it can easily lead to performance degradation or damage.

[0003] A search revealed Chinese patent publication number CN217233829U, which discloses an axial flow fan, comprising: a guide plate, which includes a hollow bearing and an outer ring, with guide blades sandwiched between them, and multiple cooling air inlets distributed circumferentially on the outer ring; a motor, which is connected to the outer ring of the hollow bearing, with the motor's output shaft passing through the inner ring of the hollow bearing, and the motor's interior communicating with the cooling air inlets; an impeller, which is connected to the motor's output shaft; a pressure shell, which is connected to the outer ring, and is fitted around the impeller, with a negative pressure exhaust port on the pressure shell; and a cooling air pipe, one end of which is connected to the negative pressure exhaust port, and the other end of which is connected to the interior of the motor.

[0004] In summary, existing cooling methods such as water cooling or air cooling have the disadvantages of complex structure or large size. How to utilize the gas resources of the compressor system itself to achieve compact and efficient cooling is a technical challenge in the industry.

[0005] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a two-stage cooling structure for the motor rotor of a compressor, making it more valuable for industrial applications. Utility Model Content

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a two-stage cooling structure for the motor rotor of a compressor.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A two-stage cooling structure for the motor rotor of a compressor includes, from left to right, a front housing and a rear housing mounted together. An impeller is installed in the front housing, and a motor assembly is installed in the rear housing to the right of the impeller. The motor assembly includes a motor housing and a motor stator-rotor assembly mounted in the motor housing.

[0009] It also includes a cooler located on the outside of the front housing;

[0010] A high-pressure hot gas outlet and a cooling inlet are sequentially provided on the outside of the main compression channel of the rear housing from left to right. The cooling inlet is connected to the right side of the motor cooling cavity located inside the motor housing. The high-pressure hot gas outlet is connected to the side of the main compression channel near the right side. The high-pressure hot gas outlet is connected to the cooler through a high-pressure hot gas connecting pipe. The cooling inlet is connected to the cooler through a cooling inlet connecting pipe.

[0011] Several guide vanes are evenly distributed along the circumference on the right side of the impeller, and an outlet connected to the motor cooling cavity is provided on the left side of the motor housing.

[0012] As a further improvement of this utility model, an air inlet shroud is installed on the left side of the front housing, and an air inlet cavity is provided inside the air inlet shroud.

[0013] As a further improvement of this utility model, the air inlet cover is detachably mounted on the front housing.

[0014] As a further improvement of this utility model, a mounting bracket is installed on the front housing.

[0015] As a further improvement of this utility model, an air outlet hood is installed on the right side of the rear housing, and an air outlet cavity is provided inside the air outlet hood.

[0016] As a further improvement of this utility model, the air outlet cover and the rear shell are integrally formed.

[0017] As a further improvement of this utility model, the drainage outlet is a funnel-shaped structure that diffuses from right to left.

[0018] As a further improvement of this utility model, the guide vane is a radial vane structure, a backward-curved vane structure, or an oblique flow vane structure.

[0019] As a further improvement of this utility model, standard connectors are installed at the high-pressure hot gas outlet and the cooling air inlet, respectively.

[0020] As a further improvement of this utility model, the cooler is a gas-liquid heat exchanger or a gas-gas heat exchanger equipped with a temperature controller.

[0021] By means of the above solution, this utility model has at least the following advantages:

[0022] This invention utilizes the high-pressure hot gas compressed by the compressor to effectively cool the surface of the motor stator and rotor assembly after cooling, and forms a closed gas circulation path inside the compressor, which avoids high temperature accumulation and improves the reliability of equipment operation.

[0023] This invention utilizes the compressor's own compressed gas as a cooling source, eliminating the need for additional energy supply and resulting in higher system energy efficiency.

[0024] This invention, through a structure that adapts the flow outlet to the guide vanes, can actively enhance the gas recirculation capacity and avoid cooling failure and backflow problems.

[0025] This utility model has a compact overall structure and high cooling efficiency, making it suitable for miniaturized, high-speed compressor systems.

[0026] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following are the preferred embodiments of this utility model and are described in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a two-stage cooling structure for the motor rotor of a compressor according to the present invention;

[0029] Figure 2 yes Figure 1 The front view;

[0030] Figure 3 It is about Figure 2 Sectional view at point AA;

[0031] Figure 4 yes Figure 3 A schematic diagram of the structure of the impeller and blades.

[0032] The meanings of the labels in the figures are as follows.

[0033] 1. Front housing; 2. Rear housing; 3. Air inlet hood; 4. Mounting bracket; 5. Motor assembly; 6. Air outlet hood; 7. Cooler; 8. High-pressure hot air outlet; 9. High-pressure hot air connecting pipe; 10. Cooling air inlet; 11. Cooling air inlet connecting pipe; 12. Air inlet chamber; 13. Impeller; 14. Main compression flow channel; 15. Motor housing; 16. Motor stator and rotor assembly; 17. Motor cooling chamber; 18. Drain outlet; 19. Guide vane; 20. Air outlet chamber. Detailed Implementation

[0034] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] The first embodiment of this utility model:

[0037] like Figure 1 and Figure 2 This embodiment describes a two-stage cooling structure for the motor rotor of a compressor, mainly comprising a front housing 1, a rear housing 2, a motor assembly 5, a cooler 7, and an impeller 13. A mounting bracket 4 is installed on the outside of the front housing 1 to support and lock the entire device, allowing the device to be installed in the working area.

[0038] An air inlet shroud 3 is installed on the left side of the front housing 1, and an air inlet cavity 12 is provided inside the air inlet shroud 3.

[0039] The air intake shroud 3 is detachably mounted on the front housing 1.

[0040] An air outlet hood 6 is installed on the right side of the rear housing 2, and an air outlet cavity 20 is provided inside the air outlet hood 6.

[0041] The air vent 6 is integrally formed with the rear shell 2.

[0042] like Figure 3 The front housing 1 and the rear housing 2 are distributed from left to right and installed together. An impeller 13 is installed inside the front housing 1. A motor assembly 5 is installed inside the rear housing 2 to the right of the impeller 13. The motor assembly 5 mainly includes a motor housing 15 and a motor stator-rotor assembly 16 installed inside the motor housing 15. The motor assembly 5 drives the impeller 13 on the left to rotate.

[0043] A cooler 7 is provided on one side of the rear housing 2. The cooler 7 can be a gas-liquid heat exchanger or a gas-gas heat exchanger, etc., and a temperature controller for temperature control is provided on the cooler 7.

[0044] A high-pressure hot air outlet 8 and a cooling air inlet 10 are sequentially provided on the rear housing 2 from left to right. Standard connectors are installed on the rear housing 2 at the high-pressure hot air outlet 8 and the cooling air inlet 10 respectively, so as to realize the connection between the two sides.

[0045] The inner side of the high-pressure hot gas outlet 8 is connected to the area near the right side of the main compression channel 14 located in the rear housing 2, and the outer side of the high-pressure hot gas outlet 8 is connected to the return end of the external cooler 7 through the high-pressure hot gas connecting pipe 9.

[0046] Furthermore, in some cases, the high-pressure hot gas outlet 8 can be designed with an adjustable opening angle and position to accommodate different gas distribution requirements.

[0047] The inner side of the cooling air inlet 10 is connected to the right side of the motor cooling cavity 17 located inside the motor housing 15 for mounting the motor stator and rotor assembly 16, and the outer side of the cooling air inlet 10 is connected to the outlet of the external cooler 7 through the cooling air inlet connecting pipe 11.

[0048] like Figure 3 and Figure 4 Several guide vanes 19 are evenly distributed along the circumference on the right side of the impeller 13, and an outlet 18 connected to the motor cooling cavity 17 is provided on the motor housing 15 on the right side of the impeller 13.

[0049] The aforementioned guide vane 19 is a radial blade structure, a backward-curved blade structure, or an oblique flow blade structure, and the aforementioned outlet 18 is a trumpet-shaped structure that diffuses from right to left.

[0050] A brief description of the functions of the main working components in this embodiment:

[0051] Main compression channel 14: used to transmit high-pressure hot gas compressed by the compressor;

[0052] High-pressure hot gas outlet 8: It is opened on the wall of the main compression channel 14 to guide a small part of the high-pressure hot gas out of the main compression channel 14.

[0053] External cooler 7: connected to high-pressure hot gas outlet 8, used for heat exchange and cooling of the drawn-out high-pressure hot gas;

[0054] Cooling air inlet 10: Located on the rear housing 2 of the compressor, connected to the outlet of the cooler 7, to introduce the cooled gas into the motor;

[0055] Motor cooling chamber 17: includes the motor stator winding and rotor area (i.e., motor stator-rotor assembly 16), where cooling gas exchanges heat with the motor surface;

[0056] Outlet 18: An annular gap communicating with the back of the impeller 13 is provided on the left side of the motor housing 15, through which cooling gas can flow in;

[0057] Secondary recompression mechanism: Several radial or backward-inclined blades are arranged on the back of the impeller 13 to form a small centrifugal compression structure (i.e., guide vanes 19), so that the cooling gas is passively drawn in and re-sent into the main compression channel 14 to form a cooling gas circulation.

[0058] The above structure forms the following cooling process: compressed high-pressure hot gas → high-pressure hot gas outlet 8 → external cooler 7 → cooling inlet 10 → motor cooling chamber 17 → drainage outlet 18 → secondary recompression mechanism on the back of the impeller for re-pressurization → main compression channel 14, forming a closed loop.

[0059] This embodiment is based on the structure design of an axial flow compressor. After compression, the high-pressure hot gas is discharged along the main compression channel 14. A portion of it is led out through the bypass hole (i.e., the high-pressure hot gas outlet 8) to the external heat exchanger 7 for cooling. After cooling, it enters the motor cooling chamber 17 through the cooling inlet 10 set on the casing. In the motor cooling chamber 17, it flows over the surface of the motor stator rotor assembly 16 and absorbs heat. Then, it enters the back of the impeller 13 through the rear end gap of the rotor. Through the designed two-stage recompression mechanism (i.e., the guide vanes 19), the high-pressure hot gas enters the main compression channel 14 under pressure, realizing a complete closed-loop circulation of cooling gas.

[0060] The path of the cooling gas returning to the main compression channel 14 is designed with a certain pressure difference to ensure that the cooling circuit is unidirectional.

[0061] Furthermore, this embodiment is not limited to a certain type of compressor and can be applied to centrifugal, axial, and mixed-flow compression systems simultaneously.

[0062] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0063] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A two-stage cooling structure for the motor rotor of a compressor, comprising, from left to right, a front housing (1) and a rear housing (2) mounted together, wherein an impeller (13) is mounted in the front housing (1), and a motor assembly (5) is mounted in the rear housing (2) to the right of the impeller (13), wherein the motor assembly (5) includes a motor housing (15) and a motor stator-rotor assembly (16) mounted in the motor housing (15). Its features are: It also includes a cooler (7) located outside the front housing (1); A high-pressure hot gas outlet (8) and a cooling inlet (10) are sequentially provided from left to right on the outside of the main compression channel (14) of the rear housing (2). The cooling inlet (10) is connected to the right side of the motor cooling cavity (17) located inside the motor housing (15). The high-pressure hot gas outlet (8) is connected to the side of the main compression channel (14) near the right side. The high-pressure hot gas outlet (8) is connected to the cooler (7) through the high-pressure hot gas connecting pipe (9). The cooling inlet (10) is connected to the cooler (7) through the cooling inlet connecting pipe (11). Several guide vanes (19) are evenly distributed along the circumferential direction on the right side of the impeller (13), and an outlet (18) connected to the motor cooling cavity (17) is provided on the left side of the motor housing (15).

2. The two-stage cooling structure for the motor rotor of a compressor as described in claim 1, characterized in that, An air inlet hood (3) is installed on the left side of the front housing (1), and an air inlet cavity (12) is provided inside the air inlet hood (3).

3. The two-stage cooling structure for the motor rotor of a compressor as described in claim 2, characterized in that, The air intake shroud (3) is detachably mounted on the front housing (1).

4. The two-stage cooling structure for the motor rotor of a compressor as described in claim 1, characterized in that, A mounting bracket (4) is installed on the front housing (1).

5. The two-stage cooling structure for the motor rotor of a compressor as described in claim 1, characterized in that, An air hood (6) is installed on the right side of the rear housing (2), and an air outlet cavity (20) is provided inside the air hood (6).

6. The two-stage cooling structure for the motor rotor of a compressor as described in claim 5, characterized in that, The air outlet cover (6) is integrally formed with the rear shell (2).

7. The two-stage cooling structure for the motor rotor of a compressor as described in claim 1, characterized in that, The drainage outlet (18) is a funnel-shaped structure that diffuses from right to left.

8. The two-stage cooling structure for the motor rotor of a compressor as described in claim 1, characterized in that, The guide vane (19) is a radial blade structure, a backward-curved blade structure, or an oblique flow blade structure.

9. The two-stage cooling structure for the motor rotor of a compressor as described in claim 1, characterized in that, Standard connectors are installed at the high-pressure hot gas outlet (8) and the cooling air inlet (10).

10. The two-stage cooling structure for the motor rotor of a compressor as described in claim 1, characterized in that, The cooler (7) is a gas-liquid heat exchanger or a gas-gas heat exchanger equipped with a temperature controller.

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