An electric machine, compressor and refrigeration unit

Abstract

The utility model provides a kind of motor, compressor and refrigerating unit, motor includes: shell, motor stator and flow guide structure, motor stator is set to the inside of shell, and motor stator includes stator winding, one end of flow guide structure is connected with shell, the other end of flow guide structure extends towards the direction of stator winding, to can flow guide structure inside the airflow of shell to stator winding, and flow guide structure can move to adjust the airflow flow of stator winding to change, and flow guide structure can be adjusted according to the temperature of stator winding The movement of above-mentioned. According to the utility model, the airflow flow of motor winding resistance can be increased at the moment or position of large heat generation to carry out forced cooling, the flow of smaller moment or position is reduced to reduce energy consumption, reasonably control the winding temperature of motor in safety range, improve the cooling performance of motor while also improving the energy efficiency of system.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor, a compressor, and a refrigeration unit. Background Technology

[0002] The biggest difference between semi-hermetic screw compressors and open screw compressors lies in the installation method of the motor. The motor of a semi-hermetic screw compressor is built into the casing and is cooled by the low-temperature refrigerant on the suction side; while the motor of an open screw compressor is an external motor that is cooled by air by fan blades at room temperature.

[0003] Semi-hermetic screw compressors can be categorized into single-cooling compressors, heat pump compressors, and refrigeration compressors based on their application environment. The most significant difference, even within the same displacement or structure, lies in the motor selection. For semi-hermetic screw compressors, the heat generated by the built-in motor is primarily dissipated by cooling the motor as the low-temperature refrigerant flows through it on the suction side. The low-temperature refrigerant enters from the compressor's suction port and flows through the suction channel, cooling the lead-wire windings, the iron core, and the non-lead-wire windings. For single-cooling compressors, the suction cooling channel structure is sufficient to meet the motor's cooling requirements; however, for heat pump or refrigeration compressors, the motor selection is larger, and the motor generates more heat than in single-cooling compressors. The area where the motor generates the most heat is the non-lead-wire winding. Refrigerant flow is diverted at this point to increase the refrigerant velocity, allowing the refrigerant to carry away more heat and providing forced cooling to ensure the motor's operational reliability.

[0004] Because existing semi-hermetic screw compressors suffer from technical problems such as poor motor cooling performance and uneven heat generation, this invention designs a motor, compressor, and refrigeration unit. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defect of poor motor cooling performance in the semi-hermetic screw compressor in the prior art, thereby providing a motor, compressor and refrigeration unit.

[0006] To solve the above problems, this utility model provides a motor, which includes:

[0007] The device comprises a housing, a motor stator, and a flow guiding structure. The motor stator is disposed inside the housing and includes stator windings. One end of the flow guiding structure is connected to the housing, and the other end of the flow guiding structure extends toward the stator windings to guide airflow within the housing toward the stator windings. The flow guiding structure is movable to adjust the airflow rate toward the stator windings, and the movement of the flow guiding structure is adjustable according to the temperature of the stator windings.

[0008] In some implementations...

[0009] When the temperature of the stator winding rises, the flow guiding structure can be automatically adjusted to move towards the stator winding, thereby increasing the airflow flow to the stator winding; when the temperature of the stator winding decreases, the flow guiding structure can be automatically adjusted to move away from the stator winding, thereby reducing the airflow flow to the stator winding.

[0010] In some implementations...

[0011] The first end of the flow guiding structure is connected to the inner wall of the housing or one axial end face of the housing. The flow guiding structure can rotate around the first end. The second end of the flow guiding structure extends and protrudes towards the stator winding. The motor stator has a central axis. In the projection plane of the longitudinal plane passing through the central axis, the air guiding plane of the flow guiding structure has an angle with the central axis, and the angle is in the range of [0, 90°].

[0012] In some implementations...

[0013] Along the direction of the central axis, the housing has an air inlet at one axial end and an air outlet at the other axial end. The stator winding includes a non-lead segment winding, which is located at the air outlet and protrudes axially from the other axial end of the housing. The other axial end of the housing has an axial end face. The first end of the flow guiding structure is located on the axial end face, and the second end of the flow guiding structure protrudes and extends toward the non-lead segment winding, with a minimum distance greater than 0 between it and the non-lead segment winding.

[0014] In some implementations...

[0015] The flow guiding structure is a flow guiding plate structure, and there are multiple flow guiding plates. The multiple flow guiding plates are arranged sequentially at intervals along the circumferential direction of the housing. Each flow guiding plate is equipped with a motor, and the movement of each flow guiding plate can be controlled by the motor individually. Furthermore, the movement of each flow guiding plate can be individually controlled and adjusted according to the temperature of the specific position of the non-lead winding relative to it.

[0016] In some implementations...

[0017] The angle between the air guide plane of the guide vane and the central axis is individually controlled and adjusted according to the temperature of the specific position of the non-lead winding opposite to it. When the temperature of the specific position of the non-lead winding opposite to the guide vane increases, the angle between the air guide plane of the guide vane and the central axis increases; when the temperature of the specific position of the non-lead winding opposite to the guide vane decreases, the angle between the air guide plane of the guide vane and the central axis decreases.

[0018] In some implementations...

[0019] The flow guiding structure is equipped with a liquid spraying device, which can spray liquid to cool the stator winding. The liquid spraying device can be adjusted to open and close and to adjust the size of the liquid spraying opening according to the temperature of the stator winding. When the flow guiding structure is activated to regulate the airflow, and the airflow regulation cannot reduce the temperature of the stator winding, the liquid spraying device is controlled to open, so that the flow guiding structure simultaneously guides the airflow and sprays out liquid.

[0020] In some implementations...

[0021] There are multiple spraying devices, and they are arranged one-to-one with the flow guiding structure. The spraying action of each spraying device is individually controlled according to the temperature of its relative stator winding.

[0022] And / or, the housing has a first liquid inlet channel inside, the flow guiding structure has a second liquid inlet channel inside, the flow guiding structure has a spray hole, the spray hole is opposite to the stator winding, and the housing also includes a liquid inlet pipe outside the housing. The liquid inlet pipe, the first liquid inlet channel, the second liquid inlet channel and the spray hole are connected in sequence to allow cooling liquid to be introduced from the outside to spray and cool the stator winding; the spraying device includes the second liquid inlet channel and the spray hole.

[0023] This utility model also provides a compressor, which includes the aforementioned motor.

[0024] This utility model also provides a refrigeration unit, which includes the aforementioned compressor and an evaporator. When the housing has an air inlet at one axial end, the gas introduced through the air inlet is refrigerant gas before entering the compressor. When it also includes a liquid injection device, the liquid introduced through the liquid injection device is refrigerant liquid before entering the evaporator.

[0025] The electric motor, compressor, and refrigeration unit provided by this utility model have the following beneficial effects:

[0026] 1. This utility model, by setting a flow guiding structure on the motor housing, with one end connected to the housing and the other end extending towards the stator winding, can guide the airflow inside the housing to the stator winding for cooling. Furthermore, the flow guiding structure can move according to the temperature of the stator winding to adjust the airflow rate towards it. This allows for increased airflow for forced cooling at times or locations where the motor windings generate a lot of heat, and decreased flow to reduce energy consumption at times or locations where the heat generation is low. This effectively controls the motor winding temperature within a safe range, improving both motor cooling performance and system energy efficiency, as well as the uniformity of motor cooling. It effectively solves the problems of poor motor cooling performance and uneven heat generation in existing semi-hermetic screw compressors.

[0027] 2. This utility model further improves the cooling effect by installing a liquid spraying device on the flow guiding structure. This device can spray liquid to cool the stator winding, further enhancing the cooling effect on top of airflow cooling. The spraying device can be adjusted in opening and closing, as well as the spraying opening degree, according to the temperature of the stator winding. When airflow adjustment fails to lower the temperature of the stator winding, the spraying device is activated, effectively linking the spraying with the movement of the flow guiding structure. This further improves the cooling performance of the stator winding and the uniformity of motor cooling. Furthermore, each spraying device is individually controlled to adjust the cooling degree based on the temperature at a specific location on the stator winding. This allows for increased airflow for forced cooling at locations with high heat generation in the stator winding, and reduced flow for locations with lower heat generation to reduce energy consumption. This further controls the motor winding temperature within a safe range, further improving the uniformity of motor cooling and enhancing overall motor cooling performance. Attached Figure Description

[0028] Figure 1 This is a structural diagram of the motor of this utility model;

[0029] Figure 2 This is a front longitudinal sectional view of the motor of this utility model (with the guide vanes tilted);

[0030] Figure 3 This is a front longitudinal sectional view of the motor of this utility model (with the guide vanes horizontal);

[0031] Figure 4 This is a front longitudinal sectional view of the motor of this utility model (including the liquid spraying device);

[0032] Figure 5 yes Figure 4 A schematic diagram of the flow guide plate and internal spray holes.

[0033] The reference numerals in the attached figures are as follows:

[0034] 1. Housing; 2. Motor stator; 3. Air guiding structure; 4. Stator winding; 5. Air inlet; 6. Air outlet; 7. Non-lead section winding; 8. Axial end face; 9. Air guiding plane; 10. Liquid spraying device; 11. First liquid guiding channel; 12. Second liquid guiding channel; 13. Liquid spraying hole; 14. Liquid guiding pipeline; 15. Motor. Detailed Implementation

[0035] The technical solutions of the present utility model 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 utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0039] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0040] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0041] like Figure 1-5 As shown, this utility model provides a motor, which includes:

[0042] The device comprises a housing 1, a motor stator 2, and a flow guiding structure 3. The motor stator 2 is disposed inside the housing 1 and includes a stator winding 4. One end of the flow guiding structure 3 is connected to the housing 1, and the other end of the flow guiding structure 3 extends toward the stator winding 4 to guide the airflow inside the housing 1 toward the stator winding 4. The flow guiding structure 3 is movable to adjust the airflow rate toward the stator winding 4, and the movement of the flow guiding structure 3 is adjusted according to the temperature of the stator winding 4.

[0043] This invention features a flow-guiding structure on the motor housing, with one end connected to the housing and the other extending towards the stator winding. This structure directs airflow from inside the housing to the stator winding for cooling. Furthermore, the flow-guiding structure can adjust the airflow rate according to the stator winding temperature. This allows for increased airflow for forced cooling at times or locations with high motor winding heat generation, and decreased flow for lower heat generation to reduce energy consumption. This effectively controls the motor winding temperature within a safe range, improves the uniformity of motor cooling, and enhances motor cooling performance. This invention effectively solves the problems of poor motor cooling performance and uneven heat generation in existing semi-hermetic screw compressors.

[0044] In some implementations...

[0045] When the temperature of the stator winding 4 rises, the flow guiding structure 3 can be automatically adjusted to move toward the stator winding 4, thereby increasing the airflow to the stator winding 4; when the temperature of the stator winding 4 decreases, the flow guiding structure 3 can be automatically adjusted to move away from the stator winding 4, thereby reducing the airflow to the stator winding 4.

[0046] This is the preferred relationship and structural form between the flow guiding structure and the stator winding of this utility model. When the temperature of the stator winding rises, the flow guiding structure can be automatically adjusted to move towards the stator winding, thereby increasing the airflow to the stator winding and enhancing the cooling performance of the stator winding. When the temperature of the stator winding decreases, the flow guiding structure can be automatically adjusted to move away from the stator winding, thereby reducing the airflow to the stator winding. This can reduce energy consumption and improve the energy efficiency of the system while meeting the heat dissipation performance of the stator winding.

[0047] In some implementations...

[0048] The first end of the flow guiding structure 3 is connected to the inner wall of the housing 1 or one axial end face of the housing 1. The flow guiding structure 3 can rotate around the first end. The second end of the flow guiding structure 3 extends and protrudes towards the stator winding 4. The motor stator 2 has a central axis. In the projection plane of the longitudinal plane passing through the central axis, the air guiding plane 9 of the flow guiding structure 3 has an angle with the central axis, and the angle is in the range of [0, 90°].

[0049] This is a further preferred structural form of the airflow guiding structure of this utility model. Its first end is connected to the inner wall of the shell or one axial end face of the shell. The movement of the airflow guiding structure can be controlled by rotating around the first end, so as to achieve the effect of moving the airflow guiding structure towards the stator winding or away from the stator winding. The angle between the airflow guiding plane of the airflow guiding structure and the central axis of the stator is within the range of 0 to 90°. At the 0° position, the airflow guiding plane is parallel to the axis, so that the airflow guiding structure reaches the position farthest from the stator winding. At the 90° position, the airflow guiding plane is perpendicular to the axis, so that the airflow guiding structure reaches the position closest to the stator winding. That is, the airflow guiding structure moves within the range of the farthest and closest positions to the stator winding, so as to achieve the effect of regulating the flow rate of the cooling airflow of the stator winding.

[0050] In some implementations...

[0051] Along the direction of the central axis, the housing 1 has an air inlet 5 at one axial end and an air outlet 6 at the other axial end. The stator winding 4 includes a non-leading segment winding 7, which is disposed at the air outlet 6 and protrudes axially from the other axial end of the housing 1. The other axial end of the housing 1 has an axial end face 8. The first end of the flow guiding structure 3 is disposed on the axial end face 8, and the second end of the flow guiding structure 3 protrudes and extends toward the non-leading segment winding 7. The minimum distance between the second end of the flow guiding structure 3 and the non-leading segment winding 7 is greater than 0.

[0052] This is a further preferred structural form of the motor of this utility model, namely, cooling gas is introduced through the air inlet at one end of the housing, and the airflow is guided by the flow guiding structure to the non-lead winding located at the other end of the housing axis. The airflow rate guided to the winding is adjusted according to the temperature of the non-lead winding, thereby cooling and dissipating heat from the non-lead winding. The airflow is also adaptively adjusted according to the temperature to improve cooling performance and energy efficiency.

[0053] In some implementations...

[0054] The flow guiding structure 3 is a flow guiding plate structure, and there are multiple flow guiding plates. The multiple flow guiding plates are arranged sequentially at intervals along the circumferential direction of the housing 1. Each flow guiding plate is equipped with a motor 15, and the movement of each flow guiding plate can be individually controlled by the motor 15. The movement of each flow guiding plate can be individually controlled and adjusted according to the temperature of the specific position of the non-lead winding 7 opposite to it.

[0055] The airflow guiding structure of this utility model consists of multiple airflow guiding plates spaced apart along the circumference of the housing, and each airflow guiding plate is individually controlled by the motor. The corresponding airflow guiding plate can be adjusted according to the temperature of the specific location of the non-lead section winding. It can increase the airflow to force cooling at the location of high heat generation in the stator winding, and decrease the flow to reduce energy consumption at the location of low heat generation. This controls the winding temperature of the motor within a safe range, improves the uniformity of motor cooling, and enhances the motor cooling performance.

[0056] This invention provides forced cooling to areas of the motor windings that generate significant heat by uniformly distributing a flow guiding structure along the non-lead section of the motor windings and by controlling and adjusting the flow guiding angle using a servo motor, thereby changing the airflow velocity. This effectively controls the motor winding temperature within a safe range.

[0057] The flow guiding structure for motor cooling in this utility model is as follows: Figure 1 As shown, the windings are evenly distributed and mounted on the motor housing along the circumferential direction of the motor windings. Figure 1 Preferably, 18 guide vanes are provided, each connected to an external servo mechanism and controlled by the servo mechanism. The opening angle of the guide vanes can be adjusted, ranging from 0 to 90°. The number of guide vanes can be determined according to the specific dimensions of the motor and motor housing. The length of the guide vanes only needs to be designed to ensure that they do not interfere with the motor windings during rotation from 0 to 90°.

[0058] In some implementations...

[0059] The angle between the air guide plane 9 of the guide vane and the central axis is individually controlled and adjusted according to the temperature of the specific position of the non-lead winding 7 opposite to it. When the temperature of the specific position of the non-lead winding 7 opposite to the guide vane increases, the angle between the air guide plane 9 of the guide vane and the central axis increases; when the temperature of the specific position of the non-lead winding 7 opposite to the guide vane decreases, the angle between the air guide plane 9 of the guide vane and the central axis decreases.

[0060] This is the specific control method of the guide vane of this utility model. It is adjusted by the angle between the air guide plane of the guide vane and the central axis. According to the temperature of the non-lead winding at a specific location, the angle of the air guide plane of the guide vane corresponding to it is adjusted. Decreasing the angle reduces the airflow to the non-lead winding, while increasing the angle increases the airflow to the non-lead winding. This achieves the effect of controlling the flow of the guide vane according to the temperature at a specific location, thereby achieving the effect of controlling the uniformity of motor cooling and improving the motor cooling performance.

[0061] This invention further improves the reliability of motor operation by setting a flow guiding structure in the non-lead section winding of the built-in motor, adjusting the flow guiding angle according to the real-time temperature of the motor winding, controlling the suction airflow speed, and forcing cooling, allowing the refrigerant to carry away more heat generated by the motor.

[0062] Figure 2 As shown, the cryogenic refrigerant of this invention enters the motor housing from the compressor's suction port, and then flows along the suction channel between the motor and the housing to the non-lead section winding of the motor, cooling the motor along the way. Typically, temperature sensors are placed inside the motor's lead section winding, core section, and non-lead section winding. During compressor operation, this allows for real-time monitoring of the temperature at various points on the motor. Generally, the location of the highest heat generation in the motor is... Figure 2 At the non-lead section winding of the motor. The compressor, based on the temperature of the non-lead section winding, sends commands to the servo mechanism to adjust the angle of the guide vanes, changing the refrigerant flow rate towards the non-lead section winding and thus controlling the cooling effect. If the non-lead section winding temperature is detected to be too high, the compressor will adjust the guide vanes to... Figure 1 The guide vane is positioned to direct the refrigerant directly to the non-lead section for forced cooling. Furthermore, as the angle of the guide vane changes, the cross-sectional area of ​​the flow channel at that location also changes. A smaller cross-sectional area results in a higher flow velocity for the same refrigerant flow rate, allowing the refrigerant to carry away more heat and achieving better cooling.

[0063] In some implementations...

[0064] The flow guiding structure 3 is provided with a liquid spraying device 10, which can spray liquid to cool the stator winding 4. The liquid spraying device 10 can be adjusted to open and close and to adjust the size of the liquid spraying opening according to the temperature of the stator winding 4. When the flow guiding structure 3 is activated to regulate the airflow, and the airflow regulation cannot reduce the temperature of the stator winding 4, the liquid spraying device 10 is controlled to open, so that the flow guiding structure 3 simultaneously guides the airflow and sprays out liquid.

[0065] This invention also incorporates a liquid spraying device on the flow guiding structure. This device can spray liquid to cool the stator windings, further enhancing the cooling effect by adding liquid spraying on top of airflow cooling. The spraying device can be adjusted in opening and closing, as well as the spraying opening size, according to the temperature of the stator windings. When airflow adjustment fails to lower the temperature of the stator windings, the spraying device is activated, effectively linking the liquid spraying with the movement of the flow guiding structure. This further improves the cooling performance of the stator windings, enhances the uniformity of motor cooling, and improves overall motor cooling performance.

[0066] This invention introduces a separate, lower-temperature refrigerant from the screw compressor system by simultaneously setting a liquid spray channel on the flow guide structure. Based on the real-time temperature of various parts of the motor windings, liquid is sprayed for point cooling, ensuring a consistent temperature along the circumference of the motor windings and extending the motor's service life.

[0067] In some implementations...

[0068] There are multiple spraying devices 10, and each spraying device 10 is set in a one-to-one correspondence with the flow guiding structure 3. The spraying action of each spraying device 10 is individually controlled according to the temperature of the stator winding 4 opposite to it.

[0069] And / or, the housing 1 is provided with a first liquid inlet channel 11 inside, the flow guiding structure 3 is provided with a second liquid inlet channel 12 inside, the flow guiding structure 3 is provided with a spray hole 13, the spray hole 13 is opposite to the stator winding 4, and also includes a liquid inlet pipe 14 outside the housing 1, the liquid inlet pipe 14, the first liquid inlet channel 11, the second liquid inlet channel 12 and the spray hole 13 are connected in sequence so as to introduce cooling liquid from the outside to spray cooling liquid onto the stator winding 4; the spraying device includes the second liquid inlet channel 12 and the spray hole 13.

[0070] This invention further enables individual control of each liquid spraying device, allowing for precise control of the cooling degree based on the temperature at specific locations of the stator windings. This allows for increased airflow for forced cooling at locations with high heat generation in the stator windings, and reduced flow for locations with lower heat generation to reduce energy consumption. It also further controls the motor winding temperature within a safe range, improves the uniformity of motor cooling, and enhances motor cooling performance. Preferably, this invention utilizes external liquid inlet pipes, an internal first liquid inlet channel, a second liquid inlet channel within the guide structure, and spray holes on the guide structure to introduce cooling liquid from the outside and transmit it to the spray holes for cooling the stator windings.

[0071] The preferred semi-hermetic screw compressor of this invention, under extreme operating conditions, simultaneously activates the liquid injection mode while controlling the flow guiding structure, so that the non-lead wire windings with high heat generation of the motor are fully cooled, and the temperature of the motor windings is evenly distributed, further ensuring the reliability of motor operation.

[0072] Figure 4It is shown that the liquid spraying structure of each guide vane does not need to be turned on or off simultaneously. It can be turned on selectively based on the temperature parameters of the temperature sensors at various points on the non-lead section of the motor. If the temperature is very high in one area and relatively low in others, the liquid spraying structure at the high-temperature area can be turned on individually for cooling. Furthermore, the number of liquid spraying structures and the amount of liquid sprayed can be controlled according to the temperature parameters at various points on the non-lead section of the winding to ensure that the temperature along the circumference of the motor winding remains within a safe range, thus extending the motor's service life.

[0073] Figure 5 As shown, the structure of the guide vane in this invention is not unique; it can be square, circular, or fan-shaped, depending on the actual structure of the compressor. The diameter and number of injection holes also depend on the compressor's operating environment; in harsher environments, the diameter and number of injection holes should be increased accordingly. The design principle for the injection parameters is simply to ensure that the motor operates within a safe temperature range.

[0074] This utility model also provides a motor control method as described above, which includes:

[0075] The detection step involves detecting the temperature of the stator winding 4.

[0076] The judgment step is to determine the relationship between the temperature of the stator winding 4 and the first preset temperature;

[0077] In the control steps, when the temperature of the stator winding 4 is higher than the first preset temperature, the flow guiding structure 3 is controlled to move to increase the gas flow rate to the stator winding 4; when the temperature of the stator winding 4 is lower than the first preset temperature, the flow guiding structure 3 is controlled to move to decrease the gas flow rate to the stator winding 4.

[0078] This invention, through the aforementioned control method, can increase the airflow for forced cooling when the motor windings generate a large amount of heat, and decrease the flow rate to reduce energy consumption when the heat generation is small. It can reasonably control the motor winding temperature within a safe range, improve the motor cooling performance, enhance the system's energy efficiency, and improve the uniformity of motor cooling. This effectively solves the problems of poor motor cooling performance and uneven heating in existing semi-hermetic screw compressors.

[0079] In some implementations...

[0080] When the spraying device 10 is also included

[0081] In the judgment step, the relationship between the temperature of the stator winding 4 and the second preset temperature is also judged, wherein the second preset temperature is greater than the first preset temperature.

[0082] In the control steps, when the temperature of the stator winding 4 is higher than the second preset temperature, the liquid spraying device 10 is also controlled to spray liquid onto the stator winding 4.

[0083] This invention, through the aforementioned control methods, can also adjust the opening and closing of the spray nozzle and the spray opening size according to the temperature of the stator winding. When the airflow adjustment cannot reduce the temperature of the stator winding, the spray nozzle is controlled to open, thereby achieving an effective correlation between the spray nozzle and the movement of the guide structure, further improving the cooling performance of the stator winding and the uniformity of motor cooling, and thus improving the motor cooling performance.

[0084] This invention addresses the issue that if the compressor is operating well and the motor is not generating much heat, there is no need to use a flow-guiding structure to forcibly cool the motor windings. Figure 3 As shown, the guide vane can be adjusted to 90°, i.e., a horizontal position, so that the refrigerant can flow out directly horizontally, reducing friction loss and avoiding unnecessary energy efficiency degradation of the compressor.

[0085] If the compressor operates under extremely harsh conditions and the motor generates a lot of heat, this patent utilizes a flow-guiding structure to forcibly cool the motor windings while simultaneously activating a liquid injection cooling function. For example... Figure 4 As shown, the combination of the flow guiding structure and the liquid spraying structure allows for rapid cooling of the motor windings, ensuring its normal operation.

[0086] This utility model also provides a compressor (preferably a semi-hermetic screw compressor) which includes the aforementioned motor.

[0087] This invention addresses the problems of motor cooling and uneven heat generation in semi-hermetic screw compressors by providing a flow guiding and liquid spray cooling solution. This solution achieves uniform cooling of the built-in motor, ensuring that motor heat generation remains within a controllable range and improving the motor's operational reliability.

[0088] This utility model also provides a refrigeration unit (preferably a semi-hermetic screw compressor refrigeration unit), which includes the aforementioned compressor and an evaporator. When the housing 1 has an air inlet 5 at one axial end, the gas introduced by the air inlet 5 is the refrigerant gas before entering the compressor. When it also includes a liquid spraying device 10, the liquid introduced by the liquid spraying device 10 is the refrigerant liquid before entering the evaporator.

[0089] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this 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 this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An electric machine characterized by: include: The device comprises a housing (1), a motor stator (2), and a flow guiding structure (3). The motor stator (2) is disposed inside the housing (1) and includes a stator winding (4). One end of the flow guiding structure (3) is connected to the housing (1), and the other end of the flow guiding structure (3) extends toward the stator winding (4) to guide the airflow in the housing (1) toward the stator winding (4). The flow guiding structure (3) is movable to adjust the airflow rate toward the stator winding (4), and the flow guiding structure (3) can adjust the above-mentioned movement according to the temperature of the stator winding (4).

2. The motor according to claim 1, characterized in that: When the temperature of the stator winding (4) rises, the flow guiding structure (3) can be automatically adjusted to move toward the stator winding (4), thereby increasing the airflow to the stator winding (4); when the temperature of the stator winding (4) decreases, the flow guiding structure (3) can be automatically adjusted to move away from the stator winding (4), thereby reducing the airflow to the stator winding (4).

3. The motor according to claim 1, characterized in that: The first end of the flow guiding structure (3) is connected to the inner wall of the housing (1) or one axial end face of the housing (1). The flow guiding structure (3) can rotate around the first end. The second end of the flow guiding structure (3) extends and protrudes toward the stator winding (4). The motor stator (2) has a central axis. In the projection plane of the longitudinal plane passing through the central axis, the air guiding plane (9) of the flow guiding structure (3) has an angle with the central axis, and the angle is in the range of [0, 90°].

4. The motor according to claim 3, characterized in that: Along the direction of the central axis, the housing (1) has an air inlet (5) at one axial end and an air outlet (6) at the other axial end. The stator winding (4) includes a non-leading segment winding (7), which is located at the air outlet (6) and protrudes axially from the other axial end of the housing (1). The other axial end of the housing (1) has an axial end face (8). The first end of the flow guiding structure (3) is located on the axial end face (8), and the second end of the flow guiding structure (3) protrudes and extends toward the non-leading segment winding (7), with a minimum distance greater than 0 between it and the non-leading segment winding (7).

5. The motor according to claim 4, characterized in that: The flow guiding structure (3) is a flow guiding plate structure, and there are multiple flow guiding plates. The multiple flow guiding plates are arranged sequentially at intervals along the circumferential direction of the housing (1). Each flow guiding plate is equipped with a motor (15) corresponding to it. The movement of each flow guiding plate can be controlled by the motor (15) individually. The movement of each flow guiding plate can be individually controlled and adjusted according to the temperature of the specific position of the non-lead winding (7) opposite to it.

6. The motor according to claim 5, characterized in that: The angle between the air guide plane (9) of the guide vane and the central axis is individually controlled and adjusted according to the temperature of the specific position of the non-lead winding (7) opposite to it. When the temperature of the specific position of the non-lead winding (7) opposite to the guide vane increases, the angle between the air guide plane (9) of the guide vane and the central axis increases; when the temperature of the specific position of the non-lead winding (7) opposite to the guide vane decreases, the angle between the air guide plane (9) of the guide vane and the central axis decreases.

7. The motor according to claim 1, characterized in that: The flow guiding structure (3) is provided with a liquid spraying device (10), which can spray liquid to cool the stator winding (4). The liquid spraying device (10) can be adjusted to open and close and to adjust the size of the liquid spraying opening according to the temperature of the stator winding (4). When the flow guiding structure (3) opens the airflow adjustment and the airflow adjustment cannot reduce the temperature of the stator winding (4), the liquid spraying device (10) is controlled to open, so that the flow guiding structure (3) simultaneously guides the airflow and sprays out liquid.

8. The motor according to claim 7, characterized in that: There are multiple spraying devices (10), and each spraying device (10) is set in a one-to-one correspondence with the flow guiding structure (3). The spraying action of each spraying device (10) is individually controlled according to the temperature of the stator winding (4) opposite to it. And / or, the housing (1) is provided with a first liquid channel (11) inside, the flow guiding structure (3) is provided with a second liquid channel (12) inside, the flow guiding structure (3) is provided with a spray hole (13) and the spray hole (13) is opposite to the stator winding (4), and also includes a liquid channel (14) outside the housing (1), the liquid channel (14), the first liquid channel (11), the second liquid channel (12) and the spray hole (13) are connected in sequence so as to introduce cooling liquid from the outside to spray cooling liquid onto the stator winding (4); the spraying device includes the second liquid channel (12) and the spray hole (13).

9. A compressor characterized by: The motor included in any one of claims 1-8.

10. A refrigeration unit characterized by: The compressor as described in claim 9 is further comprising an evaporator. When the housing (1) has an air inlet (5) at one axial end, the gas introduced by the air inlet (5) is refrigerant gas that has entered the compressor. When the compressor is further comprising a liquid injection device (10), the liquid introduced by the liquid injection device (10) is refrigerant liquid that has entered the evaporator.

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