Motor, control method, compressor and refrigerating unit

Abstract

The invention provides a motor, a control method, a compressor and a refrigerating unit, the motor comprises a shell, a motor stator and a diversion structure, the motor stator is arranged in the shell, the motor stator comprises a stator winding, one end of the diversion structure is connected with the shell, the other end of the diversion structure extends towards the stator winding, and the diversion structure is arranged in the shell. The flow guide structure is arranged in the shell so that airflow in the shell can be guided to the stator winding, the flow guide structure can move so as to adjust the flow of the airflow flowing to the stator winding to change, and the flow guide structure can adjust the movement according to the temperature of the stator winding. According to the invention, the air flow can be increased at the moment or position where the heating value of the motor winding is large to carry out forced cooling, the flow is reduced at the moment or position where the heating value is small to reduce energy consumption, the winding temperature of the motor is reasonably controlled within a safe range, and the energy efficiency of the system can be improved while the cooling performance of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor, a control method, a compressor and a refrigeration unit. Background Art

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

[0003] Semi-hermetic screw compressors can be categorized by application environment, including cooling-only, heat pump, and refrigeration compressors. Within the same displacement and structure, the most significant difference lies in the motor selection. In semi-hermetic screw compressors, heat generated by the internal motor is primarily dissipated by cooling the motor through the low-temperature refrigerant on the suction side. The low-temperature refrigerant enters the compressor through the suction port and flows through the suction duct, cooling the lead-segment windings, core, and non-lead-segment windings. For cooling-only compressors, the suction cooling duct structure can meet the motor cooling requirements. However, for heat pump or refrigeration compressors, the motors are larger, generating greater heat than in cooling-only compressors. The non-lead-segment windings generate the most heat during motor operation. Refrigerant flow is directed here to increase refrigerant flow velocity, allowing the refrigerant to remove more heat and achieve forced cooling, ensuring motor reliability.

[0004] Since the semi-hermetic screw compressors in the prior art have technical problems such as poor motor cooling performance and uneven heating, the present invention studies and designs a motor, a control method, a compressor and a refrigeration unit. Summary of the Invention

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

[0006] In order to solve the above problems, the present invention provides a motor comprising: A shell, a motor stator and a guide structure, wherein the motor stator is arranged inside the shell and includes a stator winding. One end of the guide structure is connected to the shell, and the other end of the guide structure extends toward the stator winding so as to guide the airflow in the shell toward the stator winding. The guide structure can move to adjust the airflow flow to the stator winding, and the guide structure can adjust the above movement according to the temperature of the stator winding.

[0007] In some embodiments, When the temperature of the stator winding increases, the guide structure can be automatically adjusted to move toward the stator winding, thereby increasing the airflow flow toward the stator winding; when the temperature of the stator winding decreases, the guide structure can be automatically adjusted to move away from the stator winding, thereby reducing the airflow flow toward the stator winding.

[0008] In some embodiments, The first end of the guide structure is connected to the inner wall of the shell or an axial end face of the shell, the guide structure can rotate around the first end, the second end of the guide structure extends and protrudes toward the direction of the stator winding, the motor stator has a central axis, and in the projection plane of the longitudinal plane passing through the central axis, the wind guide plane of the guide structure has an angle with the central axis, and the angle is in the range of [0, 90°].

[0009] In some embodiments, Along the direction of the central axis, the shell 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 arranged at the air outlet, and the non-lead segment winding protrudes axially from the other axial end of the shell. The other axial end of the shell has an axial end surface, the first end of the guide structure is arranged on the axial end surface, and the second end of the guide structure protrudes and extends toward the direction of the non-lead segment winding and the minimum distance between the second end and the non-lead segment winding is greater than 0.

[0010] In some embodiments, The guide structure is a guide plate structure, and there are multiple guide plates, which are arranged in sequence along the circumferential direction of the shell. Each guide plate is provided with a motor in a one-to-one correspondence, and the movement of each guide plate can be individually controlled by the motor, and the movement of each guide plate can be individually controlled and adjusted according to the temperature of the specific position of the non-lead segment winding relative to it.

[0011] In some embodiments, The angle between the air guide plane of the guide plate and the central axis is individually controlled and adjusted according to the temperature of the specific position of the non-lead segment winding opposite to the guide plate. When the temperature of the specific position of the non-lead segment winding opposite to the guide plate increases, the angle between the air guide plane of the guide plate and the central axis increases; when the temperature of the specific position of the non-lead segment winding opposite to the guide plate decreases, the angle between the air guide plane of the guide plate and the central axis decreases.

[0012] In some embodiments, The guide structure is provided with a liquid spray device, which can spray liquid to cool the stator winding; the liquid spray device can be opened and closed and the liquid spray opening size can be adjusted according to the temperature of the stator winding; when the guide structure turns on the airflow adjustment and the airflow adjustment cannot reduce the temperature of the stator winding, the liquid spray device is controlled to open, so that the guide structure guides the airflow and sprays liquid at the same time.

[0013] In some embodiments, There are multiple liquid spraying devices, which are arranged in a one-to-one correspondence with the guide structures. The liquid spraying action of each liquid spraying device is individually controlled according to the temperature of the stator winding to which it is connected; And / or, a first liquid inlet channel is provided inside the shell, a second liquid inlet channel is provided inside the guide structure, a liquid spray hole is provided on the guide structure, the liquid spray hole is opposite to the stator winding, and also includes a liquid inlet pipeline outside the shell, the liquid inlet pipeline, the first liquid inlet channel, the second liquid inlet channel and the liquid spray hole are connected in sequence so that cooling liquid can be introduced from the outside to spray cool the stator winding; the liquid spray device includes the second liquid inlet channel and the liquid spray hole.

[0014] The present invention further provides a method for controlling the motor as described above, comprising: a detecting step of detecting the temperature of the stator winding; a determining step of determining a relationship between the temperature of the stator winding and a first preset temperature; A control step, when the temperature of the stator winding is higher than a first preset temperature, controlling the movement of the guide structure to increase the gas flow flowing to the stator winding; when the temperature of the stator winding is lower than the first preset temperature, controlling the movement of the guide structure to reduce the gas flow flowing to the stator winding.

[0015] In some embodiments, When a liquid spraying device is also included, In the determining step, a relationship between the temperature of the stator winding and a second preset temperature is further determined, wherein the second preset temperature is greater than the first preset temperature; In the control step, when the temperature of the stator winding is higher than a second preset temperature, the liquid spraying device is further controlled to spray liquid on the stator winding.

[0016] The present invention also provides a compressor comprising the aforementioned motor.

[0017] The present invention also provides a refrigeration unit, which includes the aforementioned compressor and an evaporator. When one axial end of the shell has an air inlet, the gas introduced by the air inlet is the refrigerant gas before entering the compressor. When it also includes a liquid spray device, the liquid introduced by the liquid spray device is the refrigerant liquid before entering the evaporator.

[0018] The motor, control method, compressor and refrigeration unit provided by the present invention have the following beneficial effects: 1. The present invention provides a flow-guiding structure on the housing of the motor, one end of which is connected to the housing and the other end extends toward the stator winding, so as to guide the airflow inside the housing to the stator winding to cool the stator winding. In addition, the flow-guiding structure of the present invention can also move according to the temperature of the stator winding to adjust the flow rate of the airflow to the stator winding. The flow rate can be increased at the time or position where the motor winding generates a lot of heat to perform forced cooling, and the flow rate can be reduced at the time or position where the heat generation is small to reduce energy consumption. The motor winding temperature is reasonably controlled within a safe range, and the energy efficiency of the system can be improved while improving the motor cooling performance. The uniformity of the motor cooling can also be improved, effectively solving the problems of poor motor cooling performance and uneven heating in the existing semi-hermetic screw compressors in the prior art.

[0019] 2. The present invention also provides a liquid spray device on the guide structure, which can spray liquid to cool the stator winding, and can further increase liquid spray cooling on the basis of air flow cooling, thereby improving the cooling effect. The liquid spray device can be opened and closed and the liquid spray opening size can be adjusted according to the temperature of the stator winding. When the air flow adjustment cannot reduce the temperature of the stator winding, the liquid spray device is controlled to open, so that the liquid spray and the movement of the guide structure form an effective correlation, further improving the cooling performance of the stator winding, and improving the uniformity of the motor cooling, thereby improving the cooling performance of the motor; further, each liquid spray device is individually controlled to control the degree of cooling according to the temperature of the stator winding at a specific position, further increasing the air flow rate at the position where the stator winding generates more heat for forced cooling, and reducing the flow rate at the position where the heat generation is smaller to reduce energy consumption, further controlling the winding temperature of the motor within a safe range, further improving the uniformity of the motor cooling, and improving the cooling performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is an appearance structural diagram of the motor of the present invention; Figure 2 This is a front longitudinal sectional structural diagram of the motor of the present invention (with the guide vanes tilted); Figure 3 is a front longitudinal sectional structural diagram of the motor of the present invention (with the guide vane horizontal); Figure 4 is a front longitudinal sectional structural diagram of the motor of the present invention (including a liquid spraying device); Figure 5 yes Figure 4 Schematic diagram of the structure of the guide plate and internal spray hole.

[0021] The reference numerals indicate: 1. Housing; 2. Motor stator; 3. Air guide structure; 4. Stator winding; 5. Air inlet; 6. Air outlet; 7. Non-lead segment winding; 8. Axial end face; 9. Air guide plane; 10. Liquid spray device; 11. First liquid inlet channel; 12. Second liquid inlet channel; 13. Liquid spray hole; 14. Liquid inlet pipeline; 15. Motor. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0025] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0028] like Figure 1-5 As shown, the present invention provides a motor, which includes: A shell 1, a motor stator 2 and a guide structure 3, wherein the motor stator 2 is arranged inside the shell 1, and the motor stator 2 includes a stator winding 4, one end of the guide structure 3 is connected to the shell 1, and the other end of the guide structure 3 extends toward the stator winding 4 so as to guide the airflow in the shell 1 toward the stator winding 4, and the guide structure 3 can move to adjust the airflow flow to the stator winding 4, and the guide structure 3 can adjust the above movement according to the temperature of the stator winding 4.

[0029] The present invention provides a flow-guiding structure on the housing of the motor, one end of which is connected to the housing and the other end extends toward the stator winding. The flow-guiding structure can guide the airflow inside the housing to the stator winding to cool the stator winding. The flow-guiding structure of the present invention can also move according to the temperature of the stator winding to adjust the airflow rate flowing to the stator winding. The flow rate can be increased at the moment or position where the heat generation of the motor winding is large to perform forced cooling, and the flow rate can be reduced at the moment or position where the heat generation is small to reduce energy consumption. The winding temperature of the motor is reasonably controlled within a safe range, the uniformity of the motor cooling is improved, the cooling performance of the motor is improved, and the problems of poor motor cooling performance and uneven heating in the existing semi-hermetic screw compressors in the prior art are effectively solved.

[0030] In some embodiments, When the temperature of the stator winding 4 increases, the guide structure 3 can be automatically adjusted to move toward the stator winding 4, thereby increasing the airflow flow toward the stator winding 4; when the temperature of the stator winding 4 decreases, the guide structure 3 can be automatically adjusted to move away from the stator winding 4, thereby reducing the airflow flow toward the stator winding 4.

[0031] This is the preferred relationship and structural form between the guide structure and the stator winding of the present invention, that is, when the temperature of the stator winding rises, the guide structure can be automatically adjusted to move toward the stator winding, thereby increasing the airflow flow to the stator winding and enhancing the cooling and heat dissipation performance of the stator winding; and when the temperature of the stator winding drops, the guide structure can be automatically adjusted to move away from the stator winding, thereby reducing the airflow flow to the stator winding, and reducing energy consumption while meeting the heat dissipation performance of the stator winding, thereby improving the energy efficiency of the system.

[0032] In some embodiments, The first end of the guide structure 3 is connected to the inner wall of the shell 1 or an axial end face of the shell 1, and the guide structure 3 can rotate around the first end. The second end of the guide structure 3 extends and protrudes toward the direction of the stator winding 4. The motor stator 2 has a central axis, and in the projection plane of the longitudinal plane passing through the central axis, the wind guide plane 9 of the guide structure 3 has an angle with the central axis, and the angle range is [0, 90°].

[0033] This is a further preferred structural form of the guide structure of the present invention, wherein the first end thereof is connected to the inner wall of the shell or an axial end face of the shell, and the guide structure can be controlled to move by rotating the guide structure around the first end, thereby achieving the effect of the guide structure moving toward the stator winding or away from the stator winding. The angle range between the guide plane of the guide structure of the present invention and the stator center axis is within the range of 0~90°. When in the 0° position, the guide plane is parallel to the axis, so that the guide structure reaches the position farthest from the stator winding, and when in the 90° position, the guide plane is perpendicular to the axis, so that the guide structure reaches the position closest to the stator winding, that is, the guide structure moves in the position range farthest and closest to the stator winding, thereby achieving the effect of regulating the flow rate of the stator winding cooling airflow.

[0034] In some embodiments, Along the direction of the central axis, the shell 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-lead segment winding 7. The non-lead segment winding 7 is arranged at the air outlet 6, and the non-lead segment winding 7 protrudes axially from the other axial end of the shell 1. The other axial end of the shell 1 has an axial end surface 8. The first end of the guide structure 3 is arranged on the axial end surface 8, and the second end of the guide structure 3 protrudes and extends toward the direction of the non-lead segment winding 7 and the minimum distance between the non-lead segment winding 7 and the non-lead segment winding 7 is greater than 0.

[0035] This is a further preferred structural form of the motor of the present invention, that is, cooling gas is introduced through the air inlet at one end of the shell, and the airflow is guided to the non-lead segment winding located at the other axial end of the shell by the guiding effect of the guide structure, and the airflow flow directed to the winding is adjusted according to the temperature of the non-lead segment winding, thereby cooling and dissipating the heat of the non-lead segment winding, and adaptively adjusting according to the temperature to improve the cooling performance and improve energy efficiency.

[0036] In some embodiments, The guide structure 3 is a guide plate structure, and there are multiple guide plates, which are arranged in sequence along the circumferential direction of the shell 1. Each guide plate is provided with a motor 15 in a one-to-one correspondence, and the movement of each guide plate can be individually controlled by the motor 15, and the movement of each guide plate can be individually controlled and adjusted according to the temperature of the specific position of the non-lead segment winding 7 relative to it.

[0037] The guide structure of the present invention comprises a plurality of guide vanes arranged at intervals along the circumference of the shell, and each guide vane is individually controlled by a motor. The corresponding guide vane can be individually controlled for adjustment according to the temperature of the specific position of the non-lead segment winding. The air flow rate can be increased at the position where the stator winding generates a large amount of heat for forced cooling, and the flow rate can be reduced at the position where the heat generation is small to reduce energy consumption, thereby controlling the winding temperature of the motor within a safe range, improving the uniformity of the motor cooling, and improving the cooling performance of the motor.

[0038] The present invention evenly arranges flow guide structures on the non-lead windings of the motor, controls and adjusts the flow guide angle through a servo motor to change the suction flow rate, and forcibly cools the parts of the motor winding where heat is high, so as to reasonably control the winding temperature of the motor within a safe range.

[0039] The flow guide structure for motor cooling of the present invention is as follows Figure 1 As shown, the motor windings are evenly distributed and installed on the motor housing along the circumference of the motor. Figure 1 Preferably, 18 guide vanes are provided, each connected to an external servo mechanism and controlled by the servo mechanism to adjust the opening angle of the guide vane from 0 to 90 degrees. The number of guide vanes can be determined based on the size of the motor and motor housing. The length of the guide vanes should only be designed to ensure that the guide vanes do not interfere with the motor windings during the 0-90 degree rotation process.

[0040] In some embodiments, The angle between the air guide plane 9 of the guide plate and the central axis is individually controlled and adjusted according to the temperature of the specific position of the non-lead segment winding 7 opposite to it. When the temperature of the specific position of the non-lead segment winding 7 opposite to the guide plate increases, the angle between the air guide plane 9 of the guide plate and the central axis increases; when the temperature of the specific position of the non-lead segment winding 7 opposite to the guide plate decreases, the angle between the air guide plane 9 of the guide plate and the central axis decreases.

[0041] This is the specific control form of the guide vane of the present invention, that is, the size of the angle between the guide plane of the guide vane and the central axis is adjusted, and according to the temperature of the non-lead segment winding at a specific position, the above-mentioned angle of the guide plane of the guide vane corresponding to it is adjusted. If the angle is reduced, the airflow directed to the non-lead segment winding can be reduced, and if the angle is increased, the airflow directed to the non-lead segment winding can be increased, thereby achieving adjustment of the guide vane according to the temperature of the specific position, achieving a control effect on the uniformity of motor cooling, and improving the cooling performance of the motor.

[0042] The present invention further provides a flow guide structure on the non-lead winding of the built-in motor, adjusts the flow guide angle according to the real-time temperature of the motor winding, controls the suction flow rate, and forces cooling, allowing the refrigerant to take away more heat generated by the motor, thereby improving the operating reliability of the motor.

[0043] Figure 2 As shown, the low-temperature refrigerant of the present invention enters the motor housing from the compressor intake port, and then flows along the intake air channel between the motor and the housing to the non-lead winding of the motor, cooling the motor along the way. Generally, temperature sensors are arranged inside the motor lead winding, core section, and non-lead winding. During the operation of the compressor, the temperature of various parts of the motor can be monitored in real time. Generally, the position where the motor generates the most heat is at Figure 2 The compressor will send instructions to the servo mechanism according to the temperature of the non-lead winding of the motor, adjust the angle of the guide vane, change the flow rate of the refrigerant flowing to the non-lead winding of the motor, and thus control the cooling effect. If the temperature of the non-lead winding is too high, the compressor will set the guide vane to Figure 1 The guide vane angle changes, causing the refrigerant to flow directly to the non-lead windings for forced cooling. Furthermore, as the guide vane angle changes, the cross-sectional area of the flow path at that location also changes. A smaller cross-sectional area results in a higher flow rate at the same refrigerant flow rate, allowing the refrigerant to remove more heat and achieve better cooling.

[0044] In some embodiments, The guide 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 opened and closed and the liquid spraying opening size can be adjusted according to the temperature of the stator winding 4; when the guide structure 3 turns on 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 guide structure 3 guides the airflow and sprays liquid at the same time.

[0045] The present invention also provides a liquid spray device on the guide structure. The liquid spray device can spray liquid to cool the stator winding, and can further increase the liquid spray cooling on the basis of air flow cooling, thereby improving the cooling effect. The liquid spray device can be opened and closed and the liquid spray opening size can be adjusted according to the temperature of the stator winding. When the air flow adjustment cannot reduce the temperature of the stator winding, the liquid spray device is controlled to open, thereby achieving an effective correlation between the liquid spray and the movement of the guide structure, further improving the cooling performance of the stator winding, and improving the uniformity of the motor cooling, thereby improving the cooling performance of the motor.

[0046] The present invention synchronously arranges a liquid spray flow channel on the guide structure, and separately introduces a refrigerant with a lower temperature from the screw unit system. According to the real-time temperature of various parts of the motor winding, liquid spray cooling is performed on the points to ensure that the temperature of the motor winding in the circumferential direction is consistent, thereby extending the service life of the motor.

[0047] In some embodiments, There are multiple liquid spraying devices 10, and they are arranged one by one corresponding to the guide structure 3. The liquid spraying action of each liquid spraying device 10 is individually controlled according to the temperature of the stator winding 4 corresponding thereto; And / or, a first liquid inlet channel 11 is provided inside the shell 1, a second liquid inlet channel 12 is provided inside the guide structure 3, a liquid spray hole 13 is provided on the guide structure 3, and the liquid spray hole 13 is opposite to the stator winding 4. It also includes a liquid inlet pipeline 14 outside the shell 1, and the liquid inlet pipeline 14, the first liquid inlet channel 11, the second liquid inlet channel 12 and the liquid spray hole 13 are connected in sequence so that cooling liquid can be introduced from the outside to spray cool the stator winding 4; the liquid spray device includes the second liquid inlet channel 12 and the liquid spray hole 13.

[0048] The present invention further controls the degree of cooling of the stator winding according to the temperature of the stator winding at a specific position by individually controlling each liquid spray device. It can further increase the air flow rate at the position where the stator winding generates a large amount of heat for forced cooling, and reduce the flow rate at the position where the heat generation is small to reduce energy consumption, thereby further controlling the winding temperature of the motor within a safe range, further improving the uniformity of the motor cooling, and improving the cooling performance of the motor. The present invention preferably realizes the effect of introducing cooling liquid from the outside through the liquid inlet pipeline outside the shell, the first liquid inlet channel inside the shell, the second liquid inlet channel inside the guide structure, and the liquid spray hole on the guide structure, so as to transmit the cooling liquid to the liquid spray hole to cool the stator winding.

[0049] The preferred semi-hermetic screw compressor of the present invention, under extreme working conditions, controls the flow guide structure while simultaneously turning on the liquid injection mode, so that the non-lead winding of the motor with high heat generation can be fully cooled, so that the temperature of the motor winding is evenly distributed, further ensuring the reliability of the motor operation.

[0050] Figure 4 The liquid spray mechanisms in each guide vane do not need to be activated or deactivated simultaneously. They can be activated selectively based on the temperature parameters of temperature sensors located in various locations along the non-lead windings of the motor. If the temperature is high in one area and relatively low elsewhere, the liquid spray mechanism in the hottest location can be activated to cool that location separately. Furthermore, the number of liquid spray mechanisms activated and the amount of liquid sprayed can be controlled based on the temperature parameters of various locations along the non-lead windings to ensure that the circumferential temperature of the motor windings remains within a safe range, thereby extending the motor's service life.

[0051] Figure 5 As shown, the guide vane of the present invention has multiple structures and can be square, circular, or fan-shaped, depending on the actual compressor structure. The diameter and number of the spray holes also depend on the compressor's operating environment. For harsher operating environments, the diameter and number of the spray holes should be increased accordingly. The principle for designing the spray parameters is to ensure that the motor operates within a safe temperature range.

[0052] The present invention further provides a method for controlling the motor as described above, comprising: a detection step of detecting the temperature of the stator winding 4; a determination step of determining a relationship between the temperature of the stator winding 4 and a first preset temperature; Control step: when the temperature of the stator winding 4 is higher than a first preset temperature, control the guide structure 3 to move to increase the gas flow flowing to the stator winding 4; when the temperature of the stator winding 4 is lower than the first preset temperature, control the guide structure 3 to move to reduce the gas flow flowing to the stator winding 4.

[0053] Through the above-mentioned control method, the present invention can increase the air flow rate at the time or position where the motor winding generates a lot of heat to perform forced cooling, and reduce the flow rate at the time or position where the heat generation is small to reduce energy consumption, and reasonably control the motor winding temperature within a safe range. While improving the motor cooling performance, it can also improve the energy efficiency of the system and improve the uniformity of motor cooling, effectively solving the problems of poor motor cooling performance and uneven heating in existing semi-hermetic screw compressors in the prior art.

[0054] In some embodiments, When the liquid spraying device 10 is also included, In the judging step, the relationship between the temperature of the stator winding 4 and a second preset temperature is further judged, wherein the second preset temperature is greater than the first preset temperature; In the control step, when the temperature of the stator winding 4 is higher than a second preset temperature, the liquid spraying device 10 is further controlled to spray liquid on the stator winding 4 .

[0055] The present invention can also adjust the opening and closing and the opening size of the spray according to the temperature of the stator winding through the above-mentioned control means. When the airflow adjustment cannot reduce the temperature of the stator winding, the spray device is controlled to open, thereby achieving an effective correlation between the spray and the movement of the guide structure, further improving the cooling performance of the stator winding, and improving the uniformity of the motor cooling, thereby improving the cooling performance of the motor.

[0056] The present invention: If the compressor is running well and the motor does not generate much heat, then there is no need to use the guide structure to force the motor winding temperature to cool down. Figure 3 As shown, the guide vane can be adjusted to 90°, that is, the horizontal position, so that the refrigerant can flow out directly horizontally, reducing the resistance loss along the way and avoiding unnecessary energy efficiency degradation of the compressor.

[0057] If the compressor is running in very bad conditions and the motor is heating up very much, this patent uses the guide structure to force the motor winding temperature to cool down while simultaneously starting the liquid spray cooling function. Figure 4 As shown in FIG, the flow guide structure is combined with the liquid spray structure to allow the motor winding to cool quickly and ensure its normal operation.

[0058] The present invention also provides a compressor (preferably a semi-hermetic screw compressor), which includes the aforementioned motor.

[0059] The present invention addresses the problems of motor cooling and uneven heating of a semi-hermetic screw compressor. The present invention provides a diversion and liquid spray cooling solution, which achieves uniform cooling of the built-in motor, ensures that the motor heating is within a controllable range, and improves the operating reliability of the motor.

[0060] The present invention also provides a refrigeration unit (preferably a semi-hermetic screw compressor refrigeration unit), which includes the aforementioned compressor and an evaporator. When one axial end of the shell 1 has an air inlet 5, 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.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A motor, characterized in that: include: A housing (1), a motor stator (2) and a flow guide structure (3), wherein the motor stator (2) is arranged inside the housing (1), and the motor stator (2) includes a stator winding (4), one end of the flow guide structure (3) is connected to the housing (1), and the other end of the flow guide structure (3) extends toward the stator winding (4) so as to guide the airflow in the housing (1) toward the stator winding (4), and the flow guide structure (3) can move to adjust the flow rate of the airflow flowing to the stator winding (4), and the flow guide structure (3) can adjust the above 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) increases, the flow guide structure (3) can be automatically adjusted to move in the direction of the stator winding (4), thereby increasing the airflow rate flowing toward the stator winding (4); when the temperature of the stator winding (4) decreases, the flow guide structure (3) can be automatically adjusted to move in the direction away from the stator winding (4), thereby reducing the airflow rate flowing toward 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 an 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 direction of the stator winding (4); the motor stator (2) has a central axis, and within a projection plane of a longitudinal plane passing through the central axis, an air guide 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 shell (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-lead segment winding (7), the non-lead segment winding (7) is arranged at the air outlet (6), and the non-lead segment winding (7) protrudes axially from the other axial end of the shell (1), the other axial end of the shell (1) has an axial end surface (8), the first end of the guide structure (3) is arranged on the axial end surface (8), the second end of the guide structure (3) protrudes toward the direction of the non-lead segment winding (7) and the minimum distance between the second end and the non-lead segment winding (7) is greater than 0.

5. The motor according to claim 4, characterized in that: The guide structure (3) is a guide plate structure, and the guide plates are multiple, and the multiple guide plates are arranged in sequence along the circumferential direction of the shell (1). Each guide plate is provided with a motor (15) in a one-to-one correspondence, and the movement of each guide plate can be individually controlled by the motor (15), and the movement of each guide plate can be individually controlled and adjusted according to the temperature of the specific position of the non-lead segment winding (7) relative to it.

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

7. The motor according to claim 1, characterized in that: The guide structure (3) is provided with a liquid spraying device (10), and the liquid spraying device (10) can spray liquid to cool the stator winding (4); the liquid spraying device (10) can be opened and closed and the liquid spraying opening size can be adjusted according to the temperature of the stator winding (4); when the guide structure (3) turns on 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 guide structure (3) guides the airflow and sprays liquid at the same time.

8. The motor according to claim 7, characterized in that: There are a plurality of liquid spraying devices (10), which are arranged in one-to-one correspondence with the flow guide structure (3). The liquid spraying action of each liquid spraying device (10) is individually controlled according to the temperature of the stator winding (4) corresponding thereto. And / or, a first liquid inlet channel (11) is provided inside the shell (1), a second liquid inlet channel (12) is provided inside the flow guide structure (3), a liquid spray hole (13) is provided on the flow guide structure (3), the liquid spray hole (13) is opposite to the stator winding (4), and further comprises a liquid inlet pipeline (14) outside the shell (1), the liquid inlet pipeline (14), the first liquid inlet channel (11), the second liquid inlet channel (12) and the liquid spray hole (13) are connected in sequence so as to be able to introduce cooling liquid from the outside to spray cooling on the stator winding (4); the liquid spray device comprises the second liquid inlet channel (12) and the liquid spray hole (13).

9. A method for controlling a motor according to any one of claims 1 to 8, characterized in that: include: A detection step of detecting the temperature of the stator winding (4); a judging step of judging the relationship between the temperature of the stator winding (4) and a first preset temperature; A control step, when the temperature of the stator winding (4) is higher than a first preset temperature, controlling the flow guide structure (3) to move so as to increase the gas flow flowing to the stator winding (4); when the temperature of the stator winding (4) is lower than the first preset temperature, controlling the flow guide structure (3) to move so as to reduce the gas flow flowing to the stator winding (4).

10. The control method according to claim 9, characterized in that: When the liquid spraying device (10) is also included, In the judging step, the relationship between the temperature of the stator winding (4) and a second preset temperature is also judged, wherein the second preset temperature is greater than the first preset temperature; In the control step, when the temperature of the stator winding (4) is higher than a second preset temperature, the liquid spraying device (10) is further controlled to spray liquid on the stator winding (4).

11. A compressor, characterized in that: The motor comprises the motor according to any one of claims 1 to 8.

12. A refrigeration unit, characterized in that: The compressor according to claim 11 also includes an evaporator. When an air inlet (5) is provided at one axial end of the shell (1), the gas introduced by the air inlet (5) is the refrigerant gas before entering the compressor. When a liquid spraying device (10) is also provided, the liquid introduced by the liquid spraying device (10) is the refrigerant liquid before entering the evaporator.

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