Motor assembly, compressor and heat pump system

Abstract

The utility model provides a motor assembly, a compressor and a heat pump system. The motor assembly comprises a shell, and a cooling inlet and a cooling outlet are formed in the shell; the cooling shell is arranged on the shell, a cooling flow channel is formed in the cooling shell, one end of the cooling flow channel is communicated with the cooling inlet, and the other end of the cooling flow channel is communicated with the cooling outlet; and the heat exchanger is arranged in the cooling flow channel. According to the motor assembly, the compressor and the heat pump system provided by the utility model, the heat exchanger is used for cooling the gas in the shell, and the low-temperature gas flows through the interior of the shell, so that the heat dissipation of parts in the shell is realized, the problem that the reliability of the motor is influenced because only the heat dissipation of the stator can be realized in the prior art is solved, and the reliability of the motor is improved. The heat dissipation effect is improved, the problem of demagnetization of the permanent magnet when the permanent magnet synchronous motor is awakened at high temperature is solved, and the reliability of the compressor and the heat pump system is improved.

Description

Technical Field

[0001] This utility model relates to the field of drive technology, and in particular to a motor assembly, compressor and heat pump system. Background Technology

[0002] Mechanical vapor recompression (MVR) systems are steam heat pump systems. Their principle involves compressing low-temperature, low-pressure steam using a mechanical compressor, increasing the steam's temperature, pressure, and specific enthalpy. The steam is then condensed in a condenser, releasing heat for use as a high-grade heat source. On one hand, MVR systems offer advantages over traditional evaporation and concentration processes, including lower operating costs, environmental friendliness, simpler structure, and easier operation. On the other hand, due to rising steam prices, stricter environmental policies, and energy consumption restrictions, MVR units are gradually replacing traditional evaporation and concentration units, leading to a continuously expanding market.

[0003] The steam compressor is the core equipment of an MVR system. Currently, steam centrifugal compressors in the MVR field often use three-phase AC asynchronous motors, which drive the impeller to perform work on the steam through a coupling and speed-increasing gears. This structure is limited by factors such as the low efficiency of three-phase asynchronous motors, large gear transmission losses, and multiple bearing supports, making it impossible to further improve compressor energy efficiency. In contrast, high-speed permanent magnet synchronous motors offer high efficiency, compact structure, high power factor, and good control characteristics. These advantages have led to their gradual replacement of asynchronous motors in steam centrifugal compressors.

[0004] For permanent magnet synchronous motors, especially high-power, high-speed motors, the more compact structure results in a higher power density per unit volume, generating more heat than ordinary motors during operation. If cooling is insufficient, this heat accumulates, causing the temperature of the rotor permanent magnets and stator windings to gradually rise. This severely impacts the motor's performance and lifespan, primarily in the following ways: First, temperature affects the magnetism of the rotor permanent magnets; excessively high temperatures can cause irreversible demagnetization. Second, when operating in excessively high-temperature environments, the insulation materials age faster and their insulation performance decreases. Finally, higher winding temperatures lead to higher resistance and greater motor losses, generating even more heat and creating a vicious cycle that significantly reduces motor efficiency.

[0005] Existing motor cooling technologies mainly include the following: natural cooling, forced air cooling, self-ventilation, and water cooling. Natural cooling, forced air cooling, and self-ventilation have low heat dissipation efficiency and cannot meet the cooling requirements of high-power permanent magnet synchronous motors. Furthermore, forced air cooling is not compact enough and generates a lot of noise. Water cooling involves setting water cooling channels on the motor casing to dissipate heat through conduction. However, the water cooling channels are a certain distance from heat sources such as the stator, windings, and magnets, resulting in high thermal resistance. Moreover, since the exhaust temperature of steam compressors is very high, generally above 200°C, and the water cooling channels are distributed around the stator, the cooling process can only prioritize the cooling of the stator, and the rotor cannot be reliably cooled. At the same time, the exhaust heat is also transferred through the casing, making the motor casing temperature very high as well. This leads to insufficient cooling of the permanent magnet synchronous motor and affects the motor efficiency. Utility Model Content

[0006] In order to solve the technical problem of insufficient motor cooling affecting motor efficiency in the prior art, a motor assembly, compressor and heat pump system are provided that use heat exchanger cooling gas to cool both the casing and the interior of the casing to improve efficiency.

[0007] A motor assembly, comprising:

[0008] A housing, wherein a cooling inlet and a cooling outlet are provided on the housing;

[0009] A cooling housing is disposed on the housing, and a cooling channel is formed inside the cooling housing. One end of the cooling channel is connected to the cooling inlet, and the other end is connected to the cooling outlet.

[0010] A heat exchanger, wherein the heat exchanger is disposed within the cooling channel.

[0011] The motor assembly also includes an atomizing nozzle, which is disposed within the cooling channel and the atomizing nozzle's mist outlet direction points towards the cooling inlet.

[0012] The motor assembly also includes a water receiving tray, which is located below the heat exchanger, and the inlet of the atomizing nozzle is connected to the water receiving tray.

[0013] The motor assembly also includes a fan located between the heat exchanger and the cooling inlet, and the atomizing nozzle points towards the fan.

[0014] The motor assembly also includes a stator sleeve, in which a stator is disposed, and the stator sleeve is fitted onto the stator and completely encloses the stator.

[0015] The motor assembly also includes a rotor, a rotation space is formed on the stator sleeve, the rotor is rotatably disposed in the rotation space, there is a gap between the rotor and the inner wall of the rotation space, and the cooling inlet and the cooling outlet are interconnected through the gap.

[0016] The thickness of the stator sleeve ranges from 0.5 mm to 1.5 mm.

[0017] The motor assembly also includes a compressor, a condenser, and a throttling mechanism, wherein the compressor, the condenser, the throttling mechanism, and the heat exchanger are connected end to end to form a heat exchange cycle.

[0018] A compressor comprising the aforementioned motor assembly.

[0019] A heat pump system comprising the aforementioned motor assembly or the aforementioned compressor.

[0020] The motor assembly, compressor, and heat pump system provided by this utility model utilize a heat exchanger to cool the gas inside the casing. By using the low-temperature gas to flow through the interior of the casing, heat dissipation is achieved for the components inside the casing. This overcomes the problem in the prior art that only the stator can be cooled, which affects the reliability of the motor. It improves the heat dissipation effect, solves the problem of permanent magnet demagnetization in permanent magnet synchronous motors under high-temperature wake-up conditions, and improves the reliability of the compressor and heat pump system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the motor assembly provided in an embodiment of the present utility model;

[0022] Figure 2 Another structural schematic diagram of the motor assembly provided in this embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the stator sleeve provided in an embodiment of the present utility model;

[0024] In the picture:

[0025] 1. Shell; 11. Cooling inlet; 12. Cooling outlet; 2. Cooling outer shell; 21. Cooling flow channel; 3. Heat exchanger; 4. Atomizing nozzle; 5. Fan; 6. Stator sleeve; 13. Stator; 14. Rotor; 7. Water receiving tray. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0027] 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" 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 direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Existing motor cooling technologies mainly include the following: natural cooling, forced air cooling, self-ventilation, and water cooling. Natural cooling, forced air cooling, and self-ventilation have low heat dissipation efficiency and cannot meet the cooling requirements of high-power permanent magnet synchronous motors. Furthermore, forced air cooling is not compact enough and generates a lot of noise. Water cooling involves setting water cooling channels on the motor casing to dissipate heat through conduction. However, the water cooling channels are a certain distance from heat sources such as the stator, windings, and magnets, resulting in high thermal resistance. Moreover, since the exhaust temperature of steam compressors is very high, generally above 200°C, and the water cooling channels are distributed around the stator, the cooling process can only prioritize the cooling of the stator, and the rotor cannot be reliably cooled. At the same time, the exhaust heat is also transferred through the casing, making the motor casing temperature very high as well. This leads to insufficient cooling of the permanent magnet synchronous motor and affects the motor efficiency.

[0032] Therefore, this application provides a method such as Figures 1 to 3 The motor assembly shown includes: a housing 1, on which a cooling inlet 11 and a cooling outlet 12 are provided; a cooling outer shell 2, disposed on the housing 1, and having a cooling channel 21 formed within it, one end of which communicates with the cooling inlet 11 and the other end with the cooling outlet 12; and a heat exchanger 3 disposed within the cooling channel 21. The heat exchanger 3 cools the gas inside the housing 1, utilizing the low-temperature gas flowing through the interior of the housing 1 to dissipate heat from the components inside. This overcomes the problem in existing technologies where only the stator can be cooled, affecting motor reliability, thus improving heat dissipation. It also solves the problem of permanent magnet demagnetization in permanent magnet synchronous motors during high-temperature wake-up, improving the reliability of the compressor and heat pump system.

[0033] To further improve heat dissipation, the motor assembly also includes an atomizing nozzle 4, which is disposed within the cooling channel 21, with the atomizing nozzle 4 pointing towards the cooling inlet 11. By spraying mist into the cooling channel 21 using the atomizing nozzle 4, the humidity of the gas within the cooling channel 21 is increased, thereby improving cooling efficiency.

[0034] In one embodiment, the motor assembly further includes a water receiving tray 7, which is disposed below the heat exchanger 3, and the inlet of the atomizing nozzle 4 is connected to the water receiving tray 7. During heat exchange, the heat exchanger 3 generates condensation, which the water receiving tray 7 collects, preventing water droplets from entering the housing 1 and affecting the normal operation of the motor assembly. Simultaneously, the atomizing nozzle 4 can also draw water from the water receiving tray 7, thus achieving water supply to the atomizing nozzle 4 and enabling water recycling.

[0035] The motor assembly also includes a fan 5, which is located between the heat exchanger 3 and the cooling inlet 11. The mist outlet direction of the atomizing nozzle 4 is directed towards the fan 5. The fan 5 drives the gas in the cooling channel 21 and the housing 1, ensuring that the gas undergoes heat exchange in the heat exchanger 3 and enters the housing 1 for cooling, thus ensuring reliable cooling of the housing 1 and its internal components.

[0036] The motor assembly also includes a stator sleeve 6. A stator 13 is disposed inside the housing 1, and the stator sleeve 6 is fitted onto the stator 13, completely enclosing the stator 13. Since the atomizing nozzle 4 delivers water mist into the housing 1, and the stator 13 has windings, the stator sleeve 6 completely encloses the stator 13 to prevent water mist from reaching the windings and affecting its reliability. The lead-out points of the stator 13's windings on the stator sleeve 6 are sealed using processes such as gluing to ensure the reliable operation of the motor assembly.

[0037] Optionally, the stator sleeve 6 can be made of stainless steel, which can upgrade the waterproof rating of the motor assembly to IP67.

[0038] The thickness of the stator sleeve 6 ranges from 0.5 mm to 1.5 mm. Preferably, the thickness of the stator sleeve 6 is 1 mm, which can be produced by mold pressing and welding.

[0039] The motor assembly also includes a rotor 14. A rotational space is formed on the stator sleeve 6, and the rotor 14 is rotatably disposed within this rotational space. A gap exists between the rotor 14 and the inner wall of the rotational space. The cooling inlet 11 and the cooling outlet 12 are interconnected through this gap. The rotational space ensures reliable rotation of the rotor 14 and also guarantees reliable engagement between the rotor 14 and the stator 13. The gap between the rotor 14 and the stator sleeve 6 prevents structural interference between them, ensuring reliable rotation of the rotor 14. Simultaneously, it allows cooling gas to flow through the rotor 14 for heat dissipation, further improving the heat dissipation efficiency of the motor assembly and ensuring the operational reliability of both the motor assembly and the compressor.

[0040] The motor assembly also includes a compressor, a condenser, and a throttling mechanism. The compressor, the condenser, the throttling mechanism, and the heat exchanger 3 are connected end to end to form a heat exchange cycle. The heat exchange cycle enables the heat exchanger 3 to perform refrigeration, ensuring the refrigeration reliability of the motor shaft assembly.

[0041] A compressor comprising the aforementioned motor assembly.

[0042] A heat pump system comprising the aforementioned motor assembly or the aforementioned compressor.

[0043] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A motor assembly, characterized in that: include: A housing (1) having a cooling inlet (11) and a cooling outlet (12) provided thereon; A cooling shell (2) is disposed on the housing (1), and a cooling channel (21) is formed inside the cooling shell (2). One end of the cooling channel (21) is connected to the cooling inlet (11), and the other end is connected to the cooling outlet (12). Heat exchanger (3) is disposed in the cooling channel (21).

2. The motor assembly according to claim 1, characterized in that: The motor assembly also includes an atomizing nozzle (4), which is disposed in the cooling channel (21) and the atomizing nozzle (4) points to the cooling inlet (11).

3. The motor assembly according to claim 2, characterized in that: The motor assembly also includes a water receiving tray (7), which is located below the heat exchanger (3), and the inlet of the atomizing nozzle (4) is connected to the water receiving tray (7).

4. The motor assembly according to claim 2, characterized in that: The motor assembly also includes a fan (5) located between the heat exchanger (3) and the cooling inlet (11), and the atomizing nozzle (4) is directed to the fan (5) in the direction of mist output.

5. The motor assembly according to claim 2, characterized in that: The motor assembly also includes a stator sleeve (6), and a stator (13) is disposed inside the housing (1). The stator sleeve (6) is fitted onto the stator (13) and the stator sleeve (6) completely covers the stator (13).

6. The motor assembly according to claim 5, characterized in that: The motor assembly also includes a rotor (14), a rotation space is formed on the stator sleeve (6), the rotor (14) is rotatably disposed in the rotation space, there is a gap between the rotor (14) and the inner wall of the rotation space, and the cooling inlet (11) and the cooling outlet (12) are interconnected through the gap.

7. The motor assembly according to claim 5, characterized in that: The thickness of the stator sleeve (6) ranges from 0.5 mm to 1.5 mm.

8. The motor assembly according to claim 1, characterized in that: The motor assembly also includes a compressor, a condenser, and a throttling mechanism, wherein the compressor, the condenser, the throttling mechanism, and the heat exchanger (3) are connected end to end to form a heat exchange cycle.

9. A compressor, characterized in that: Includes the motor assembly according to any one of claims 1 to 8.

10. A heat pump system, characterized in that: Includes the motor assembly according to any one of claims 1 to 8 or the compressor according to claim 9.

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