Motor assembly, compressor and heat exchange system

Abstract

The utility model provides a motor assembly, a compressor and a heat exchange system. The motor assembly includes: a housing; a stator; and a rotor. According to the motor assembly, the compressor and the heat exchange system provided by the utility model, the liquid inlet cavity is arranged on the shell to guide the liquid for cooling to the stator, so that the liquid can be fully contacted with the stator for cooling, and meanwhile, the liquid passing channel is arranged on the stator to directly guide part of the liquid to the outer wall of the rotor, so that the cooling efficiency is improved. At the moment, the stator is completely soaked in the liquid, the cooling efficiency and the cooling effect of the stator can be guaranteed, meanwhile, due to the contact between the liquid and the rotor, the rotor can be reliably cooled, the situation of local high temperature of the motor in the prior art is effectively avoided, and the service life of the motor is prolonged. The problems of demagnetization and burnout caused by large heating value and over-high temperature of the motor are solved, and the reliability of the motor and the compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of driving equipment, in particular to a motor component, a compressor and a heat exchange system. Background Art

[0002] The centrifugal compressor motor generates a lot of heat during operation, and the motor needs to be continuously cooled to prevent the motor from overheating and causing demagnetization, burning and other failures. The cooling of the centrifugal compressor motor is generally carried out with liquid refrigerant, which absorbs the heat generated by the motor during operation through the low-temperature refrigerant. The refrigerant after absorbing heat is gasified and discharged from the inside of the motor. In this way, during the operation of the centrifuge, liquid refrigerant is continuously input into the centrifugal compressor motor, and the refrigerant after absorbing heat and gasification is continuously discharged from the motor, forming a complete cooling circuit to achieve continuous cooling of the motor.

[0003] However, many centrifugal compressors in the prior art adopt the function of opening an annular flow channel on the motor housing to achieve the function of uniform cooling of the motor. By opening a liquid inlet hole on the motor housing and connecting it to the liquid refrigerant pipeline through a valve, when the centrifugal compressor is started, the low-temperature liquid refrigerant continuously enters the annular flow channel inside the motor housing from the liquid inlet, and flows from one end of the motor to the other end, continuously cooling the motor, and finally being discharged from the return air hole at the other end of the motor. The discharged gaseous refrigerant will be condensed again to become low-temperature liquid refrigerant and enter the annular flow channel of the motor housing again. However, when the centrifugal compressor operates under high load conditions, the motor generates particularly high heat. When the liquid refrigerant with one-side inlet passes through the annular flow channel, the liquid refrigerant will quickly vaporize due to the large amount of heat absorption, resulting in only gaseous refrigerant in part of the annular flow channel at the other end of the motor housing. The gaseous refrigerant cannot effectively cool this section of the motor, which will cause local high temperature in the motor. In severe cases, it will cause the unit to shut down for high temperature protection or even burn out the motor, seriously affecting the reliability of the motor. Utility Model Content

[0004] In order to solve the technical problem in the prior art that the motor's heat dissipation efficiency is poor and the heat dissipation is uneven, resulting in poor reliability of the motor, a motor assembly, a compressor and a heat exchange system are provided, which directly inject cooling liquid into the stator and the rotor for immersion to ensure the heat dissipation efficiency and heat dissipation uniformity to improve reliability.

[0005] A motor assembly, comprising:

[0006] A shell body, wherein a liquid inlet cavity, a liquid inlet port and a liquid delivery port are provided on the shell body, and the liquid inlet cavity is connected with the liquid supply structure through the liquid inlet port;

[0007] A stator, wherein the stator is disposed in the housing, and a cooling cavity is formed between the stator and the housing, and the liquid inlet cavity is connected to the cooling cavity through the liquid delivery port;

[0008] The rotor has a rotor cavity formed inside the stator, the rotor is rotatably disposed in the rotor cavity, and a liquid passage is formed on the stator, and the cooling cavity is connected to the rotor cavity through the liquid passage.

[0009] The shell is provided with an exhaust port, and the exhaust port is communicated with the cooling cavity.

[0010] The motor assembly further includes a cooling circulation system, which includes a compressor, a condenser, and an evaporator that are connected in sequence. The condenser constitutes the liquid supply structure, and the exhaust port is connected to the evaporator.

[0011] The liquid inlet is located at the top of the shell, and the exhaust port is located at the bottom of the shell.

[0012] The bottom of the shell is also provided with a drain port, one end of which is communicated with the cooling cavity, and the other end of which is communicated with the outside of the shell.

[0013] A drain valve is provided at the drain port, and the opening of the drain valve is adjustable.

[0014] The motor assembly further comprises a detection mechanism, which can obtain the power of the motor assembly and is electrically connected to the drain valve.

[0015] The motor assembly also includes an atomization mechanism, the stator has a first end and a second end opposite to each other, the atomization mechanism is arranged on the shell, and the inlet of the atomization mechanism is connected to the liquid inlet chamber, and the atomization outlet of the atomization mechanism faces the first end and / or the second end.

[0016] A stator winding package is formed at the first end, and an atomization outlet of the atomization mechanism faces the stator winding package; and / or a stator winding package is formed at the second end, and an atomization outlet of the atomization mechanism faces the stator winding package.

[0017] A compressor comprises the above-mentioned motor assembly.

[0018] A heat exchange system comprises the above-mentioned motor assembly or the above-mentioned compressor.

[0019] The motor assembly, compressor and heat exchange system provided by the utility model are provided with a liquid inlet cavity on the shell to guide the cooling liquid to the stator, so that the liquid can fully contact with the stator for cooling, and at the same time, a liquid passage is provided on the stator to guide part of the liquid directly to the outer wall of the rotor. At this time, the stator is completely immersed in the liquid to ensure the cooling efficiency and cooling effect of the stator. At the same time, due to the contact between the liquid and the rotor, the rotor can also be reliably cooled, effectively avoiding the occurrence of local high temperature in the motor in the prior art, solving the problem of demagnetization and burning caused by high heat generation and excessive temperature of the motor, and improving the reliability of the motor and the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a motor assembly provided in an embodiment of the utility model;

[0021] In the figure:

[0022] 1. Shell; 11. Liquid inlet chamber; 12. Liquid inlet port; 13. Liquid delivery port; 2. Stator; 21. Cooling chamber; 3. Rotor; 22. Rotor chamber; 23. Liquid passage; 14. Exhaust port; 15. Liquid discharge port; 4. Atomization mechanism; 24. Stator coil. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Many centrifugal compressors in the prior art use an annular flow channel on the motor housing to achieve the function of uniform cooling of the motor. By opening a liquid inlet hole on the motor housing and connecting it to the liquid refrigerant pipeline through a valve, when the centrifugal compressor is started, the low-temperature liquid refrigerant continuously enters the annular flow channel inside the motor housing from the liquid inlet, and flows along one end of the motor to the other end, continuously cooling the motor, and finally discharged from the return air hole at the other end of the motor. The discharged gaseous refrigerant will be condensed again to become a low-temperature liquid refrigerant and enter the annular flow channel of the motor housing again. However, when the centrifugal compressor is operating under high load conditions, the heat generated by the motor is particularly large. When the liquid refrigerant with one side of the liquid inlet passes through the annular flow channel, the liquid refrigerant will be quickly vaporized due to a large amount of heat absorption, so that only gaseous refrigerant exists in the part of the annular flow channel at the other end of the motor housing, and the gaseous refrigerant cannot effectively cool this section of the motor, which will cause the motor to have a local high temperature. In severe cases, it will cause the unit to shut down for protection due to high temperature, or even cause the motor to burn out, which seriously affects the reliability of the motor. To this end, the present application provides a Figure 1 The motor assembly shown includes: a shell 1, on which a liquid inlet chamber 11, a liquid inlet port 12 and a liquid delivery port 13 are provided, and the liquid inlet chamber 11 is connected with the liquid supply structure through the liquid inlet port 12; a stator 2, the stator 2 is arranged in the shell 1, and a cooling chamber 21 is formed between the stator 2 and the shell 1, and the liquid inlet chamber 11 is connected with the cooling chamber 21 through the liquid delivery port 13; a rotor 3, a rotor chamber 22 is formed inside the stator 2, the rotor 3 is rotatably arranged in the rotor chamber 22, and a liquid passage 23 is formed on the stator 2, and the cooling chamber 21 is connected with the rotor chamber 22 through the liquid passage 23. A liquid inlet cavity 11 is provided on the shell 1 to guide the cooling liquid to the stator 2, so that the liquid can fully contact with the stator 2 for cooling. At the same time, a liquid passage 23 is provided on the stator 2 to guide part of the liquid directly to the outer wall of the rotor 3. At this time, the stator 2 is completely immersed in the liquid to ensure the cooling efficiency and cooling effect of the stator 2. At the same time, due to the contact between the liquid and the rotor 3, the rotor 3 can also be reliably cooled, which effectively avoids the occurrence of local high temperature in the motor in the prior art, solves the problem of demagnetization and burning caused by high heat generation and excessive temperature of the motor, and improves the reliability of the motor and the compressor.

[0029] When cooling the motor assembly, the coolant used for cooling is delivered to the liquid inlet cavity 11 through the liquid inlet 12 by means of the liquid supply structure, so that the coolant can contact and exchange heat with the shell 1 in the liquid inlet cavity 11, and then the coolant can flow to the cooling cavity 21 through the liquid delivery port 13 to soak the outer wall surface of the stator 2, so that the outer wall surface of the stator 2 can be cooled, and then the coolant can pass through the stator 2 through the liquid passage 23 and flow to the rotor cavity 22 to contact the rotor 3 to cool the rotor 3. Since the temperature of the surface of the stator 2 is very high during the operation of the motor assembly, relatively less liquid coolant can flow to the rotor 3, and more is gaseous coolant. The gaseous coolant does not have too large a viscosity and will not affect the rotation of the rotor 3, thereby ensuring the operating reliability of the motor assembly. After the coolant that completes heat exchange with the rotor 3 is completely vaporized, it can flow from the gap between the stator 2 and the rotor 3, and enter the cooling chamber 21 again after flowing through the windings at the end of the stator 2. When the gaseous coolant flows through the windings, it can also cool the windings, thereby fully cooling the stator 2, the rotor 3 and the windings on the stator 2, effectively ensuring the cooling reliability of the motor assembly and improving the reliability of the use of the motor assembly.

[0030] The cross section of the cooling cavity 21 is annular, and the central axis of the annular is colinear with the central axis of the body, that is, the cold cutting cavity 21 is an annular cavity surrounding the outer peripheral side of the stator 2, and the coolant flowing into the cooling cavity 21 can contact and cool any position of the outer wall surface of the stator 2, such as Figure 1 As shown, the coolant flows in from the top of the housing 1 , and after the coolant flows into the cooling cavity 21 , it can flow smoothly to the bottom of the housing 1 .

[0031] In order to facilitate the discharge of the gaseous coolant from the housing 1, the housing 1 is provided with an exhaust port 14, which is communicated with the cooling cavity 21. The gaseous coolant that has completed the heat exchange and flowed into the cooling cavity 21 is discharged from the housing 1 to the corresponding equipment through the exhaust port 14, thereby completing the overall circulation cooling process of the coolant in the motor assembly.

[0032] The motor assembly also includes a cooling circulation system, which includes a compressor, a condenser and an evaporator connected in sequence. The condenser constitutes the liquid supply structure, and the exhaust port 14 is connected to the evaporator. The coolant is sent into the motor assembly through the condenser for cooling, and absorbs heat and vaporizes inside the motor assembly to form a gaseous coolant. The gaseous coolant is discharged into the evaporator through the exhaust port 14 to release heat, and then is sent into the condenser again through the action of the compressor, thereby realizing the recycling of the coolant. Among them, the motor assembly can be used in the compressor in this cooling circulation system, and the motor assembly is used as the power source of the compressor, so that this cooling circulation system can not only ensure the reliability of its own operation, but also exchange heat with the outside.

[0033] In order to improve the cooling effect and cooling uniformity of the coolant on the stator 2 and the rotor 3, the liquid inlet 12 is located at the top of the housing 1, and the exhaust port 14 is located at the bottom of the housing 1. The coolant flows from the top of the housing 1 into the liquid inlet cavity 11 of the housing 1 and into the cooling cavity 21 and the rotor cavity 22, and can flow under the action of gravity and the liquid supply pressure of the liquid supply structure, thereby ensuring the cooling effect and cooling uniformity of the stator 2 and the rotor 3, and effectively improving the reliability of the motor assembly.

[0034] When the motor assembly is working under a low load condition, the temperature of the stator 2 and the rotor 3 is relatively low, and the liquid coolant is easy to form liquid accumulation at the bottom of the housing 1, thereby affecting the working efficiency of the motor assembly. Therefore, a drain port 15 is also provided at the bottom of the housing 1, one end of the drain port 15 is connected to the cooling cavity 21, and the other end is connected to the outside of the housing 1. The drain port 15 is used to discharge the liquid coolant in the housing 1 to prevent the liquid coolant from affecting the working efficiency of the motor assembly.

[0035] In order to prevent the drain port 15 from being always in an open state and gaseous coolant from being discharged through the drain port 15, a drain valve is provided at the drain port 15, and the opening of the drain valve is adjustable. The drain port 15 is controlled by the drain valve to ensure that the gaseous coolant can be reliably discharged from the exhaust port 14, thereby ensuring the working reliability of the motor assembly.

[0036] The motor assembly also includes a detection mechanism, which can obtain the power of the motor assembly, and the detection mechanism is electrically connected to the drain valve. The detection mechanism is used to detect the power of the motor assembly to determine the current workload of the motor assembly, and the opening of the drain valve is controlled according to the detected workload. For example, when it is detected that the motor assembly is under a small load condition, the drain valve is opened to drain the liquid. In particular, the opening of the drain valve can be specifically controlled according to the load conditions, that is, the liquid coolant can be ensured to be discharged smoothly from the housing 1, and the gaseous coolant can be prevented from being discharged through the drain port 15. When it is detected that the motor assembly is under a large load condition, the temperature of the stator 2 and the rotor 3 can completely vaporize the liquid coolant. At this time, there is no liquid coolant to be discharged, and the drain valve is closed to ensure that the gaseous coolant in the cooling chamber 21 can be completely discharged through the exhaust port 14 to ensure the circulation effect of the coolant and improve the working reliability of the motor assembly.

[0037] Since the liquid passage 23 is located in the middle of the stator 2, the cooling effect of the end of the stator 2 is relatively weak. In order to further improve the cooling effect on the stator 2, the motor assembly also includes an atomizing mechanism 4. The stator 2 has a first end and a second end relative to each other. The atomizing mechanism 4 is arranged on the housing 1, and the inlet of the atomizing mechanism 4 is connected to the liquid inlet cavity 11, and the atomizing outlet of the atomizing mechanism 4 faces the first end and / or the second end. The liquid coolant in the liquid inlet cavity 11 is atomized by the atomizing mechanism 4 and sprayed toward the first end and / or the second end of the stator 2 to ensure the cooling effect of the first end and / or the second end. The atomized coolant is vaporized to form a gaseous coolant after contacting and exchanging heat with the first end and / or the second end of the stator 2, and enters the cooling cavity 21, and is finally discharged through the exhaust port 14, which further improves the cooling effect on the stator 2.

[0038] The stator 2 is provided with windings, and current flows in the windings to rotate the rotor 3. When the current passes through the windings, a large amount of heat is generated. Therefore, it is necessary to cool each position of the windings to improve the cooling efficiency of the stator 2. The windings form coils at the first and second ends of the stator 2, that is, a stator coil 24 is formed at the first end, and the atomization outlet of the atomization mechanism 4 faces the stator coil 24. The stator coil 24 is cooled by atomized coolant, thereby effectively improving the cooling effect of the stator 2, and further improving the cooling reliability of the motor assembly.

[0039] Similarly, a stator coil 24 is formed at the second end, and the atomization outlet of the atomization mechanism 4 faces the stator coil 24. The atomization outlet of the atomization mechanism 4 faces the stator coil 24. The stator coil 24 is cooled by the atomized coolant, thereby effectively improving the cooling effect on the stator 2.

[0040] A compressor includes the above motor assembly. The motor assembly is a part of the structure of the compressor, and the rotor of the motor assembly drives the compression component in the compressor to operate to realize the compression drive of the coolant.

[0041] The coolant may be a refrigerant, and the heat exchange cycle in which the compressor is located can both exchange heat with the outside and cool the motor assembly.

[0042] A heat exchange system comprises the above-mentioned motor assembly or the above-mentioned compressor.

[0043] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A motor assembly, characterized in that: include: A shell (1), wherein the shell (1) is provided with a liquid inlet cavity (11), a liquid inlet port (12) and a liquid delivery port (13), and the liquid inlet cavity (11) is connected to the liquid supply structure through the liquid inlet port (12); A stator (2), the stator (2) being arranged in the housing (1), and a cooling chamber (21) being formed between the stator (2) and the housing (1), and the liquid inlet chamber (11) being connected to the cooling chamber (21) via the liquid delivery port (13); A rotor (3), a rotor cavity (22) is formed inside the stator (2), the rotor (3) is rotatably arranged in the rotor cavity (22), and a liquid passage (23) is formed on the stator (2), and the cooling cavity (21) is connected to the rotor cavity (22) through the liquid passage (23).

2. The motor assembly according to claim 1, characterized in that: The housing (1) is provided with an exhaust port (14), and the exhaust port (14) is in communication with the cooling chamber (21).

3. The motor assembly according to claim 2, characterized in that: The motor assembly also includes a cooling circulation system, which includes a compressor, a condenser and an evaporator that are connected in sequence, the condenser constitutes the liquid supply structure, and the exhaust port (14) is connected to the evaporator.

4. The motor assembly according to claim 2, characterized in that: The liquid inlet (12) is located at the top of the shell (1), and the exhaust port (14) is located at the bottom of the shell (1).

5. The motor assembly according to claim 4, characterized in that: The bottom of the shell (1) is also provided with a drain port (15), one end of the drain port (15) is in communication with the cooling cavity (21), and the other end of the drain port (15) is in communication with the outside of the shell (1).

6. The motor assembly according to claim 5, characterized in that: The liquid discharge port (15) is provided with a liquid discharge valve, and the opening degree of the liquid discharge valve is adjustable.

7. The motor assembly according to claim 6, characterized in that: The motor assembly further comprises a detection mechanism, which can obtain the power of the motor assembly and is electrically connected to the drain valve.

8. The motor assembly according to claim 1, characterized in that: The motor assembly further comprises an atomizing mechanism (4), the stator (2) having a first end and a second end opposite to each other, the atomizing mechanism (4) being arranged on the housing (1), and the inlet of the atomizing mechanism (4) being in communication with the liquid inlet chamber (11), and the atomizing outlet of the atomizing mechanism (4) being oriented toward the first end and / or the second end.

9. The motor assembly according to claim 8, characterized in that: A stator winding package (24) is formed at the first end, and an atomization outlet of the atomization mechanism (4) faces the stator winding package (24); and / or a stator winding package (24) is formed at the second end, and an atomization outlet of the atomization mechanism (4) faces the stator winding package (24).

10. A compressor, characterized in that: A motor assembly comprising any one of claims 1 to 9.

11. A heat exchange system, characterized in that: The invention comprises the motor assembly according to any one of claims 1 to 9 or the compressor according to claim 10.

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