Method for regulating and controlling pressure difference between inner side and outer side of motor in refrigerant injection process

Abstract

The invention relates to the field of motor pressure regulation and control, in particular to a method for regulating and controlling the pressure difference between the inner side and the outer side of a motor in the refrigerant injection process. The shell is arranged on the outer side of the motor main body in a sealing and sleeving manner and is provided with a first pressure measuring channel, a second pressure measuring channel, a gas transmission pressurization channel, an exhaust pressure relief channel, a refrigerant feeding flow channel and a refrigerant discharging flow channel; the first pressure measuring channel is communicated with the pressure measuring hole; the refrigerant feeding flow channel and the refrigerant discharging flow channel are both communicated with the refrigerant flow channel; an adjusting cavity is arranged between the shell and the motor main body; the second pressure measuring channel, the gas transmission pressurization channel and the exhaust pressure relief channel are all communicated with the adjusting cavity; and a first pressure detection member and a second pressure detection member. The pressure difference between the inner side and the outer side of the motor is adjusted in the refrigerant injection process based on the motor structure, and long-term operation stability of the motor is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of motor pressure regulation technology, specifically to a method for regulating the pressure difference between the inside and outside of a motor during refrigerant injection. Background Technology

[0002] In many technological fields involving heat exchange and temperature control, such as refrigeration equipment and air conditioning systems, the motor, as a core drive component, is crucial to the overall system performance due to its operational stability and sealing. In some applications, refrigerant needs to be directly injected into the motor to achieve specific cooling or operational requirements; in these cases, the refrigerant injection process becomes a key factor affecting motor performance.

[0003] Currently, in processes where refrigerant is directly injected into the motor, high-pressure refrigerant is typically delivered to the motor through specific pipelines. As the refrigerant is injected, the pressure inside the motor gradually increases, creating a pressure difference between the inside and outside of the motor, which affects some internal structures.

[0004] For example, oil seals, as crucial components ensuring the sealing performance of motors, rely on the tight fit between the lip and the motor shaft surface and the stable maintenance of the oil film on the sealing surface for their operation. When a significant pressure difference exists between the inside and outside of the motor (especially in cases of high internal pressure), this pressure difference will have a direct and adverse effect on the oil seal. High-pressure refrigerant will exert an outward thrust on the oil seal lip, easily causing deformation and disrupting its original tight fit with the motor shaft surface. This allows the refrigerant inside the motor to leak to the outside through the gap created by the deformation. Simultaneously, high pressure may also break up the oil film on the sealing surface, further weakening the sealing effect of the oil seal.

[0005] Therefore, how to overcome the shortcomings of the existing technology is the subject of this invention. Summary of the Invention

[0006] The purpose of this invention is to provide a method for regulating the pressure difference between the inside and outside of a motor during refrigerant injection.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for regulating the pressure difference between the inside and outside of a motor during refrigerant injection.

[0009] The motor structure used has the following characteristics:

[0010] The motor body has a pressure measuring hole and a refrigerant flow channel.

[0011] A housing, sealed and fitted onto the outside of the motor body, has a first pressure measuring channel, a second pressure measuring channel, a gas supply pressurization channel, an exhaust pressure relief channel, a refrigerant inlet channel, and a refrigerant outlet channel. The first pressure measuring channel communicates with the pressure measuring hole. The refrigerant inlet channel and the refrigerant outlet channel are both communicated with the refrigerant channel. An adjustment cavity is provided between the housing and the motor body. The second pressure measuring channel, the gas supply pressurization channel, and the exhaust pressure relief channel are all communicated with the adjustment cavity.

[0012] First pressure testing element and second pressure testing element;

[0013] The steps of the method for regulating the pressure difference between the inside and outside of the motor include:

[0014] Step 1: Preset the first and second preset values;

[0015] Step 2: During the refrigerant injection process, the first pressure detection element is used to detect the air pressure inside the motor body through the pressure measuring hole and the first pressure measuring channel, and the first pressure value is output.

[0016] Step 3: In the process of obtaining the first pressure value, the second pressure detection element is used and the air pressure in the regulating cavity is detected through the second pressure measurement channel to output the second pressure value;

[0017] Step 4: Compare the first pressure value with the second pressure value and output the comparison result;

[0018] Step 5: Adjust the pressure difference based on the comparison results, including:

[0019] When the first pressure value is greater than the second pressure value and the difference between the two is greater than the first predetermined value, the pressure in the regulating cavity is increased through the gas supply pressurization channel;

[0020] When the first pressure value is less than the second pressure value and the difference between the two is greater than the second predetermined value, the pressure in the regulating cavity is reduced through the exhaust pressure relief channel.

[0021] This application uses refrigerant as an example, but is not limited to other media.

[0022] The first and second pressure detection elements can be set as existing pressure detection sensors, etc. It is emphasized here that the pressure detection implementation method is not an innovation of this application, and the detection structure used can refer to the existing ones.

[0023] The pressure difference between the inside and outside of the motor changes during refrigerant injection; this is common knowledge and can be found in the background section, so it will not be elaborated here. This change in pressure difference affects the use of oil seals on the motor body; this is also common knowledge and can be found in the background section.

[0024] To reduce the impact of the refrigerant injection process on the sealing operation of the oil seal, this application sets up a pressure monitoring and adjustment mechanism.

[0025] In the pressure monitoring mechanism, on the one hand, a first pressure detection element is used to detect the air pressure inside the motor body through a pressure measuring hole and a first pressure measuring channel, and outputs a first pressure value; the pressure measuring hole can be set on the rear end cover described below; the detection frequency is not limited here. On the other hand, a second pressure detection element is used to detect the air pressure in the regulating cavity through a second pressure measuring channel, and outputs a second pressure value; the detection frequency is not limited here, but must be the same as the detection frequency of the first pressure detection element. This enables the monitoring of the pressure inside and outside the motor, providing support for the subsequent pressure adjustment mechanism.

[0026] In the pressure adjustment mechanism, when the first pressure value is greater than the second pressure value and the difference between the two is greater than a first predetermined value, the pressure in the regulating cavity is increased through the gas pressurization channel; when the first pressure value is less than the second pressure value and the difference between the two is greater than a second predetermined value, the pressure in the regulating cavity is decreased through the exhaust pressure relief channel. This adjusts the pressure difference between the inside and outside of the motor, reducing the impact of the refrigerant injection process on the sealing operation of the oil seal and ensuring the long-term stable operation of the motor body.

[0027] The gas pressurization method and the exhaust depressurization method are based on existing methods and are not innovative points of this application.

[0028] It is important to emphasize that the aforementioned pressure adjustment mechanism uses two threshold values—a first predetermined value and a second predetermined value—to provide a basis for judgment, while also preventing frequent operation of the adjustment mechanism, reducing energy consumption, and extending the service life of related structures. Without setting threshold values, the pressure difference between the inner and outer sides of the motor would rapidly increase after adjustment, requiring the adjustment mechanism to be restarted within a very short time.

[0029] The specific values ​​of the first and second predetermined values ​​are not limited and can be determined by testing the effect of different pressure differences on the sealing operation of the oil seal.

[0030] It should also be emphasized that the pressure adjustment mechanism mentioned above only adjusts the pressure of the regulating cavity, thereby ensuring stable refrigerant flow, avoiding affecting the cooling effect of the refrigerant, and further ensuring the long-term stable operation of the motor body.

[0031] In a further technical solution, in step one, a third predetermined value and a fourth predetermined value are preset, wherein the third predetermined value is greater than the first predetermined value and the fourth predetermined value is greater than the second predetermined value;

[0032] Step five, adjusting the pressure difference based on the comparison results, further includes:

[0033] When the first pressure value is greater than the second pressure value and the difference between the two is greater than the third predetermined value, the pressure in the regulating cavity is increased through the gas pressurization channel, and the refrigerant flow rate in the refrigerant channel is reduced.

[0034] When the first pressure value is less than the second pressure value and the difference between the two is greater than the fourth predetermined value, the pressure in the regulating cavity is reduced through the exhaust pressure relief channel, and the refrigerant flow rate in the refrigerant channel is increased.

[0035] It should be noted that during the refrigerant injection process, the pressure difference between the inside and outside of the motor can vary due to various factors, such as over-pressurization. This application will not elaborate on the factors affecting the pressure difference between the inside and outside of the motor; for details, please refer to existing information on factors that may affect the pressure difference between the inside and outside of the motor.

[0036] The following explanation uses the third predetermined value as an example; the fourth predetermined value is explained in the same way.

[0037] The specific value of the third predetermined value is not limited and can be determined by testing the effect of different pressure differences on the sealing operation of the oil seal.

[0038] When the pressure difference between the inside and outside of the motor exceeds the third predetermined value, it indicates that the pressure difference is too large. Simply increasing the pressure in the regulating cavity through the gas pressurization channel is insufficient to quickly reduce the pressure difference to a reasonable range, which will significantly affect the sealing operation of the oil seal for a certain period of time. To solve this problem, this section also adopts the method of reducing the refrigerant flow rate in the refrigerant channel to further ensure the long-term stable operation of the motor body.

[0039] It should be noted that while a dynamic pressurization mechanism for the cavity can be introduced—for example, pressurizing at a first flow rate when the pressure difference is below a first predetermined value, at a second flow rate when the pressure difference is between the first and third predetermined values, and at a third flow rate when the pressure difference is above the third predetermined value—this approach is complex, costly to implement, and carries a higher risk of failure. The implementation method described in this section is superior to this approach in these respects.

[0040] In a further technical solution, in step one, a fifth predetermined value and a sixth predetermined value are preset, wherein the fifth predetermined value is greater than the first predetermined value and less than the third predetermined value, and the sixth predetermined value is greater than the second predetermined value and less than the fourth predetermined value;

[0041] In step five, after reducing the refrigerant flow rate in the refrigerant channel, when the difference between the first pressure value and the second pressure value is less than the fifth predetermined value, the pressure in the regulating cavity continues to be increased through the gas pressurization channel, and the refrigerant flow rate in the refrigerant channel is gradually increased to the initial value.

[0042] In step five, after increasing the refrigerant flow rate in the refrigerant channel, when the difference between the first pressure value and the second pressure value is less than the sixth predetermined value, the pressure in the regulating cavity continues to be reduced through the exhaust pressure relief channel, and the refrigerant flow rate in the refrigerant channel is gradually reduced to the initial value.

[0043] If the refrigerant flow rate in the refrigerant channel is not adjusted, it will significantly affect the sealing operation of the oil seal for a certain period of time. If the refrigerant flow rate in the refrigerant channel is adjusted, it will affect the cooling effect of the refrigerant. To balance this issue, this section introduces two threshold values: a fifth predetermined value and a sixth predetermined value.

[0044] The following explanation uses the fifth predetermined value as an example; the sixth predetermined value is explained in the same way.

[0045] The specific value of the fifth predetermined value is not limited.

[0046] When the difference between the first and second pressure values ​​is less than the fifth predetermined value, it can be considered that the difference is no longer significant, and the impact on the oil seal's sealing operation has been reduced somewhat. If we wait for the difference to decrease to less than the third predetermined value, the impact on the refrigerant's cooling effect will be prolonged. Therefore, restoring the refrigerant flow rate to its initial value in advance, although delaying the time for the difference to decrease to less than the first predetermined value, generally prevents the difference from increasing to more than the third predetermined value. This at least avoids a significant impact on the oil seal's sealing operation. During refrigerant injection, after limiting the impact on the oil seal's sealing operation to a certain range, the cooling effect must be prioritized. This section's settings achieve a balance between cooling effect and oil seal sealing effect.

[0047] A further technical solution is that the motor body includes a front cover, a rear cover, a stator assembly, a rotor assembly, and a sealing assembly;

[0048] Along the axial direction of the motor body, the front end cover and the rear end cover are respectively fixed at the symmetrical ends of the stator assembly;

[0049] The rear cover is provided with a refrigerant inlet and a first refrigerant channel, and the front cover is provided with a refrigerant outlet and a second refrigerant channel, the first refrigerant channel and the second refrigerant channel forming part of the refrigerant flow channel; the refrigerant inlet flow channel is connected to the first refrigerant channel through the refrigerant inlet, and the refrigerant outlet flow channel is connected to the second refrigerant channel through the refrigerant outlet;

[0050] The rotor assembly includes a rotating shaft, a front bearing, and a rear bearing; along the axial direction of the rotating shaft, one end of the rotating shaft is rotatably assembled to the front end cover via the front bearing, and the other end of the rotating shaft is rotatably assembled to the rear end cover via the rear bearing.

[0051] The sealing assembly is located on the side of the front bearing and the rear bearing to prevent refrigerant from flowing through the refrigerant channel to the front bearing and the rear bearing during the refrigerant injection process in step two.

[0052] When the motor body is running in a refrigerant environment for a long time, during the refrigerant injection process, the lubricating oil or grease will be carried away with the flow of refrigerant inside the motor or react with the refrigerant, causing bearing lubrication failure. This application completely isolates the bearing structure from the refrigerant flow channel through a sealing assembly, ensuring the life of the bearing lubricating oil or grease, thereby improving the life of the motor body and ensuring the stability of the motor body during long-term operation in a refrigerant environment.

[0053] It should be noted that this application does not make any adjustments to the conventional structure and internal flow channels of the motor body. Therefore, the stator assembly structure can refer to existing stator compositions. Similarly, the refrigerant flow channels inside the motor body are also not adjusted. See [link to refrigerant flow diagram]. Figure 2 The red arrow in the middle.

[0054] A further technical solution is that the sealing assembly includes:

[0055] A front seal is fitted between the rotating shaft and the front end cover and is located on the side of the front bearing facing the rear bearing to prevent refrigerant from flowing to the front bearing through the refrigerant channel during the refrigerant injection process in step two.

[0056] The rear seal is fitted between the rotating shaft and the rear end cover and is located on the side of the rear bearing facing the front bearing. It is used to prevent refrigerant from flowing to the rear bearing through the refrigerant channel during the refrigerant injection process in step two.

[0057] Taking the previous seal and front bearing as an example, the front seal is installed between the shaft and the front end cover, and is located on the side of the front bearing facing the rear bearing. During the refrigerant injection process, the front seal can prevent the refrigerant in the refrigerant channel from flowing to the front bearing.

[0058] A further technical solution is that the front end cover has mounting holes;

[0059] The motor body also includes a nut sleeve and a three-phase wiring harness. The three-phase wiring harness is connected to the stator winding leads through the mounting holes and is sealed to the front cover through the nut sleeve. This structure provides an electrical connection channel between the three-phase wiring harness and the stator windings through the mounting holes, while the nut sleeve ensures that the front cover is protected from dust and other media during motor operation, meeting the usage requirements of special internal environments of the motor (such as liquid cooling and high protection levels).

[0060] The specific setup of the three-phase wiring harness will not be discussed here; its structure and its connection with related structures are the existing setup.

[0061] In some embodiments, a nut sleeve is provided in the mounting hole. After the three-phase wire harness passes through the inner hole of the nut sleeve, a sealing structure is formed by adding seals (such as O-rings) to both ends of the nut sleeve and using fasteners such as nuts and glands to press the seals onto the surface of the front end cover.

[0062] In a further technical solution, electromagnetic proportional valves are provided at the gas pressurization channel, the exhaust pressure relief channel, and the refrigerant inlet channel;

[0063] The motor structure also includes a pressure control system, which is electrically connected to each of the electromagnetic proportional valves to adjust their opening degree during the pressure difference regulation process in step five.

[0064] An electromagnetic proportional valve can also be installed at the refrigerant outlet channel.

[0065] The electromagnetic proportional valve allows for flexible adjustment of the flow rate within the corresponding channel and flow path. Through its coordination with the pressure control system, the electromagnetic proportional valve supports the aforementioned pressure adjustment mechanism. It should be noted that this control method is existing and not an innovation of this application.

[0066] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0067] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0068] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0069] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing this case.

[0070] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0071] The working principle and advantages of this invention are as follows:

[0072] To reduce the impact of the refrigerant injection process on the sealing operation of the oil seal, this application sets up a pressure monitoring and adjustment mechanism.

[0073] In the pressure monitoring mechanism, on the one hand, a first pressure detection element is used to detect the air pressure inside the motor body through a pressure measuring hole and a first pressure measuring channel, and a first pressure value is output. On the other hand, a second pressure detection element is used to detect the air pressure inside the regulating cavity through a second pressure measuring channel, and a second pressure value is output. This enables the monitoring of the pressure inside and outside the motor, providing data support for the subsequent pressure adjustment mechanism.

[0074] In the pressure adjustment mechanism, when the first pressure value is greater than the second pressure value and the difference between the two is greater than a first predetermined value, the pressure in the regulating cavity is increased through the gas pressurization channel; when the first pressure value is less than the second pressure value and the difference between the two is greater than a second predetermined value, the pressure in the regulating cavity is decreased through the exhaust pressure relief channel. This adjusts the pressure difference between the inside and outside of the motor, reducing the impact of the refrigerant injection process on the sealing operation of the oil seal and ensuring the long-term stable operation of the motor body.

[0075] In the pressure adjustment mechanism, setting two threshold values ​​(first and second predetermined values) provides a basis for judgment, while avoiding frequent operation of the adjustment mechanism, reducing energy consumption, and extending the service life of related structures. Without setting threshold values, after adjustment, the pressure on the inside and outside of the motor will quickly differ, requiring the adjustment mechanism to be restarted within a very short time.

[0076] The pressure adjustment mechanism described above only adjusts the pressure of the regulating cavity, thereby ensuring stable refrigerant flow, avoiding any impact on the refrigerant's cooling effect, and further ensuring the long-term stable operation of the motor body. Attached Figure Description

[0077] Figure 1 This is a flowchart of the method for regulating the pressure difference between the inside and outside of a motor according to an embodiment of the present invention;

[0078] Figure 2 This is a schematic diagram of the overall structure of the motor structure according to an embodiment of the present invention;

[0079] Figure 3 This is a partial structural diagram of the motor structure according to an embodiment of the present invention;

[0080] Figure 4 This is a schematic diagram of the structure of the rotating shaft according to an embodiment of the present invention;

[0081] Figure 5 This is a front view of the front cover according to an embodiment of the present invention;

[0082] Figure 6 This is a cross-sectional view of the front cover along line AA in an embodiment of the present invention;

[0083] Figure 7 This is a structural schematic diagram of the front cover from another perspective in an embodiment of the present invention;

[0084] Figure 8 This is a front view of the rear end cover according to an embodiment of the present invention;

[0085] Figure 9 This is a cross-sectional view of the rear cover along line BB in an embodiment of the present invention;

[0086] Figure 10 This is a structural schematic diagram of the rear cover from another perspective in an embodiment of the present invention.

[0087] In the attached diagrams: 1. Pressure testing hole; 2. Housing; 21. First pressure testing channel; 22. Second pressure testing channel; 23. Gas supply and pressurization channel; 24. Exhaust and pressure relief channel; 25. Refrigerant inlet channel; 26. Refrigerant outlet channel; 4. First pressure detection element; 5. Second pressure detection element; 6. Front end cover; 61. Refrigerant outlet; 62. Second refrigerant channel; 63. Mounting hole; 64. First mounting position; 65. Second mounting position; 7. Rear... End cap; 71. Refrigerant inlet; 72. First refrigerant channel; 73. Third mounting position; 74. Fourth mounting position; 8. Stator assembly; 9. Rotor assembly; 91. Shaft; 911. Bearing structure mounting position; 912. Seal assembly mating position; 92. Front bearing; 93. Rear bearing; 10. Seal assembly; 101. Front seal; 102. Rear seal; 100. Nut sleeve; 200. Three-phase wiring harness; 300. Pressure control system. Detailed Implementation

[0088] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0089] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0090] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0091] See Figures 1-10 A method for regulating the pressure difference between the inside and outside of a motor during refrigerant injection, employing a motor structure comprising:

[0092] The motor body has a pressure measuring hole 1 and a refrigerant flow channel.

[0093] The housing 2 is sealed and fitted onto the outside of the motor body. The housing 2 has a first pressure measuring channel 21, a second pressure measuring channel 22, a gas supply and pressurization channel 23, an exhaust and pressure relief channel 24, a refrigerant inlet channel 25, and a refrigerant outlet channel 26. The first pressure measuring channel 21 communicates with the pressure measuring hole 1. The refrigerant inlet channel 25 and the refrigerant outlet channel 26 are both connected to the refrigerant channel. An adjustment cavity (not shown in the figure) is provided between the housing 2 and the motor body. The second pressure measuring channel 22, the gas supply and pressurization channel 23, and the exhaust and pressure relief channel 24 are all connected to the adjustment cavity.

[0094] First pressure detection element 4 and second pressure detection element 5;

[0095] Methods for regulating the pressure difference between the inside and outside of the motor include:

[0096] Step 1: Preset the first and second preset values;

[0097] Step 2: During the refrigerant injection process, the first pressure detection element 4 is used to detect the air pressure inside the motor body through the pressure measuring hole 1 and the first pressure measuring channel 21, and the first pressure value is output.

[0098] Step 3: In the process of obtaining the first pressure value, the second pressure detection element 5 is used and the air pressure in the regulating cavity is detected through the second pressure measuring channel 22 to output the second pressure value;

[0099] Step 4: Compare the first pressure value with the second pressure value and output the comparison result;

[0100] Step 5: Adjust the pressure difference based on the comparison results, including:

[0101] When the first pressure value is greater than the second pressure value and the difference between the two is greater than the first predetermined value, the pressure in the regulating cavity is increased through the gas supply and pressurization channel 23;

[0102] When the first pressure value is less than the second pressure value and the difference between the two is greater than the second predetermined value, the pressure in the regulating cavity is reduced through the exhaust pressure relief channel 24.

[0103] This embodiment uses refrigerant for illustration, but is not limited to other media.

[0104] The first pressure detection element 4 and the second pressure detection element 5 can be set as existing pressure detection sensors, etc. It is emphasized here that the pressure detection implementation method is not an innovation of this application, and the detection structure used to implement the detection can refer to the existing ones.

[0105] The pressure difference between the inside and outside of the motor changes during refrigerant injection; this is common knowledge and can be found in the background section, so it will not be elaborated here. This change in pressure difference affects the use of oil seals on the motor body; this is also common knowledge and can be found in the background section.

[0106] To reduce the impact of the refrigerant injection process on the sealing operation of the oil seal, this application sets up a pressure monitoring and adjustment mechanism.

[0107] In the pressure monitoring mechanism, on the one hand, a first pressure detection element 4 is used to detect the air pressure inside the motor body through a pressure measuring hole 1 and a first pressure measuring channel 21, and outputs a first pressure value; the pressure measuring hole 1 can be set on the rear end cover 7 described below; the detection frequency is not limited here. On the other hand, a second pressure detection element 5 is used to detect the air pressure in the regulating cavity through a second pressure measuring channel 22, and outputs a second pressure value; the detection frequency is not limited here, but it must be the same as the detection frequency of the first pressure detection element 4. Based on this, the pressure inside and outside the motor is monitored, providing support for the subsequent pressure adjustment mechanism.

[0108] In the pressure adjustment mechanism, when the first pressure value is greater than the second pressure value and the difference between the two is greater than a first predetermined value, the pressure in the regulating cavity is increased through the gas pressurization channel 23; when the first pressure value is less than the second pressure value and the difference between the two is greater than a second predetermined value, the pressure in the regulating cavity is reduced through the exhaust pressure relief channel 24. This adjusts the pressure difference between the inside and outside of the motor, reducing the impact of the refrigerant injection process on the sealing operation of the oil seal and ensuring the long-term stable operation of the motor body.

[0109] The gas pressurization method and the exhaust depressurization method are based on existing methods and are not innovative points of this application.

[0110] It is important to emphasize that the aforementioned pressure adjustment mechanism uses two threshold values—a first predetermined value and a second predetermined value—to provide a basis for judgment, while also preventing frequent operation of the adjustment mechanism, reducing energy consumption, and extending the service life of related structures. Without setting threshold values, the pressure difference between the inner and outer sides of the motor would rapidly increase after adjustment, requiring the adjustment mechanism to be restarted within a very short time.

[0111] The specific values ​​of the first and second predetermined values ​​are not limited and can be determined by testing the effect of different pressure differences on the sealing operation of the oil seal.

[0112] It should also be emphasized that the pressure adjustment mechanism mentioned above only adjusts the pressure of the regulating cavity, thereby ensuring stable refrigerant flow, avoiding affecting the cooling effect of the refrigerant, and further ensuring the long-term stable operation of the motor body.

[0113] In this embodiment, in step one, a third predetermined value and a fourth predetermined value are preset, wherein the third predetermined value is greater than the first predetermined value and the fourth predetermined value is greater than the second predetermined value;

[0114] Step five, the pressure difference control method also includes:

[0115] When the first pressure value is greater than the second pressure value and the difference between the two is greater than the third predetermined value, the pressure in the regulating cavity is increased through the gas pressurization channel 23, and the refrigerant flow rate in the refrigerant channel is reduced.

[0116] When the first pressure value is less than the second pressure value and the difference between the two is greater than the fourth predetermined value, the pressure in the regulating cavity is reduced through the exhaust pressure relief channel 24, and the refrigerant flow rate in the refrigerant channel is increased.

[0117] It should be noted that during the refrigerant injection process, the pressure difference between the inside and outside of the motor can vary due to various factors, such as over-pressurization. This application will not elaborate on the factors affecting the pressure difference between the inside and outside of the motor; for details, please refer to existing information on factors that may affect the pressure difference between the inside and outside of the motor.

[0118] The following explanation uses the third predetermined value as an example; the fourth predetermined value is explained in the same way.

[0119] The specific value of the third predetermined value is not limited and can be determined by testing the effect of different pressure differences on the sealing operation of the oil seal.

[0120] When the pressure difference between the inside and outside of the motor exceeds the third predetermined value, it indicates that the pressure difference is too large. Simply increasing the pressure in the regulating cavity through the gas pressurization channel 23 is insufficient to quickly reduce the pressure difference to a reasonable range, which will significantly affect the sealing operation of the oil seal for a certain period of time. To solve this problem, this section also adopts the method of reducing the refrigerant flow rate in the refrigerant channel to further ensure the long-term stable operation of the motor body.

[0121] It should be noted that while a dynamic pressurization mechanism for the cavity can be introduced—for example, pressurizing at a first flow rate when the pressure difference is below a first predetermined value, at a second flow rate when the pressure difference is between the first and third predetermined values, and at a third flow rate when the pressure difference is above the third predetermined value—this approach is complex, costly to implement, and carries a higher risk of failure. The implementation method described in this section is superior to this approach in these respects.

[0122] In this embodiment, in step one, a fifth predetermined value and a sixth predetermined value are preset. The fifth predetermined value is greater than the first predetermined value and less than the third predetermined value, and the sixth predetermined value is greater than the second predetermined value and less than the fourth predetermined value.

[0123] In step five, after reducing the refrigerant flow rate in the refrigerant channel, when the difference between the first pressure value and the second pressure value is less than the fifth predetermined value, the pressure in the regulating cavity continues to be increased through the gas supply pressurization channel 23, and the refrigerant flow rate in the refrigerant channel is gradually increased to the initial value.

[0124] In step five, after increasing the refrigerant flow rate in the refrigerant channel, when the difference between the first pressure value and the second pressure value is less than the sixth predetermined value, the pressure in the regulating cavity continues to be reduced through the exhaust pressure relief channel 24, and the refrigerant flow rate in the refrigerant channel is gradually reduced to the initial value.

[0125] If the refrigerant flow rate in the refrigerant channel is not adjusted, it will significantly affect the sealing operation of the oil seal for a certain period of time. If the refrigerant flow rate in the refrigerant channel is adjusted, it will affect the cooling effect of the refrigerant. To balance this issue, this section introduces two threshold values: a fifth predetermined value and a sixth predetermined value.

[0126] The following explanation uses the fifth predetermined value as an example; the sixth predetermined value is explained in the same way.

[0127] The specific value of the fifth predetermined value is not limited.

[0128] When the difference between the first and second pressure values ​​is less than the fifth predetermined value, it can be considered that the difference is no longer significant, and the impact on the oil seal's sealing operation has been reduced somewhat. If we wait for the difference to decrease to less than the third predetermined value, the impact on the refrigerant's cooling effect will be prolonged. Therefore, restoring the refrigerant flow rate to its initial value in advance, although delaying the time for the difference to decrease to less than the first predetermined value, generally prevents the difference from increasing to more than the third predetermined value. This at least avoids a significant impact on the oil seal's sealing operation. During refrigerant injection, after limiting the impact on the oil seal's sealing operation to a certain range, the cooling effect must be prioritized. This section's settings achieve a balance between cooling effect and oil seal sealing effect.

[0129] See Figures 2-10 In this embodiment, the motor body includes a front cover 6, a rear cover 7, a stator assembly 8, a rotor assembly 9, and a sealing assembly 10;

[0130] Along the axial direction of the motor body, the front end cover 6 and the rear end cover 7 are respectively fixed at the symmetrical ends of the stator assembly 8;

[0131] The rear cover 7 is provided with a refrigerant inlet 71 and a first refrigerant channel 72 connected together, and the front cover 6 is provided with a refrigerant outlet 61 and a second refrigerant channel 62 connected together. The first refrigerant channel 72 and the second refrigerant channel 62 constitute part of the refrigerant flow channel. The refrigerant inlet flow channel 25 is connected to the first refrigerant channel 72 through the refrigerant inlet 71, and the refrigerant outlet flow channel 26 is connected to the second refrigerant channel 62 through the refrigerant outlet 61.

[0132] The rotor assembly 9 includes a rotating shaft 91, a front bearing 92, and a rear bearing 93; along the axial direction of the rotating shaft 91, one end of the rotating shaft 91 is rotatably assembled with the front end cover 6 via the front bearing 92, and the other end of the rotating shaft 91 is rotatably assembled with the rear end cover 7 via the rear bearing 93.

[0133] The sealing assembly 10 is located on the side of the front bearing 92 and the rear bearing 93 to prevent refrigerant from flowing to the front bearing 92 and the rear bearing 93 through the refrigerant channel.

[0134] When the motor body is running in a refrigerant environment for a long time, the lubricating oil or grease will be carried away by the flow of refrigerant inside the motor or react with the refrigerant, causing bearing lubrication failure. In this embodiment, the bearing structure is completely separated from the refrigerant flow channel by the sealing group 10, which ensures the life of the bearing lubricating oil or grease, thereby improving the life of the motor body and ensuring the stability of the motor body during long-term operation in a refrigerant environment.

[0135] It should be noted that this embodiment does not make any adjustments to the conventional structure and internal flow channels of the motor body. Therefore, the structure of the stator assembly 8 can refer to the existing stator assembly 8. Similarly, the portion of the refrigerant flow channel inside the motor body is also not adjusted. See [link to refrigerant flow direction] for details. Figure 2 The red arrow in the middle.

[0136] See Figure 3 In this embodiment, the sealing assembly 10 includes:

[0137] The front seal 101 is sealed between the rotating shaft 91 and the front end cover 6, and is located on the side of the front bearing 92 facing the rear bearing 93, to prevent refrigerant from flowing to the front bearing 92 through the refrigerant channel;

[0138] The rear seal 102 is sealed between the rotating shaft 91 and the rear end cover 7, and is located on the side of the rear bearing 93 facing the front bearing 92, to prevent refrigerant from flowing to the rear bearing 93 through the refrigerant channel.

[0139] Taking the previous seal 101 and the front bearing 92 as an example, the front seal 101 is sealed between the rotating shaft 91 and the front end cover 6, and is located on the side of the front bearing 92 facing the rear bearing 93, which can prevent the refrigerant in the refrigerant channel from flowing to the front bearing 92.

[0140] See Figure 3 , Figure 5 In this embodiment, the front cover 6 is provided with mounting holes 63;

[0141] The motor body also includes a nut sleeve 100 and a three-phase wiring harness 200. The three-phase wiring harness 200 is connected to the lead wires of the stator assembly 8 through the mounting hole 63, and is sealed to the front end cover 6 through the nut sleeve 100. This structure provides an electrical connection channel between the three-phase wiring harness 200 and the stator winding through the mounting hole 63, while the nut sleeve 100 ensures that the front end cover 6 is protected from dust and other media during motor operation, meeting the usage requirements of special internal environments of the motor (such as liquid cooling, high protection level).

[0142] The specific settings of the three-phase wiring harness 200 will not be discussed here; its own configuration and its connection with related structures are the existing settings.

[0143] In some embodiments, a nut sleeve 100 is provided inside the mounting hole 63. After the three-phase wire harness 200 passes through the inner hole of the nut sleeve 100, a sealing structure is formed by adding sealing elements (such as O-rings) to both ends of the nut sleeve 100 and using fasteners such as nuts and glands to press the sealing elements onto the surface of the front end cover 6.

[0144] In this embodiment, electromagnetic proportional valves are provided at the gas pressurization channel 23, the exhaust pressure relief channel 24, and the refrigerant feed channel 25;

[0145] See Figure 1 The motor structure also includes a pressure control system 300, which is electrically connected to each of the electromagnetic proportional valves to adjust their opening degree.

[0146] An electromagnetic proportional valve can also be installed at point 26 of the refrigerant discharge channel.

[0147] The electromagnetic proportional valve allows for flexible adjustment of the flow rate in the corresponding channel and flow path. Through its cooperation with the pressure control system 300, the electromagnetic proportional valve supports the aforementioned pressure adjustment mechanism. It should be noted that this control method is existing and not an innovation of this application.

[0148] The following structural adjustments can also be made to this embodiment:

[0149] See Figure 4 The rotating shaft 91 is provided with a bearing structure mounting position 911 and a sealing assembly mating position 912;

[0150] See Figures 5-7 The front bearing 92 is located at the first mounting position 64, and the front seal 101 is located at the second mounting position 65;

[0151] See Figures 8-10 The rear bearing 93 is located at the third mounting position 73, and the rear seal 102 is located at the fourth mounting position 74;

[0152] The stator windings in stator group 8 adopt a flared design, which is conducive to the flow of refrigerant inside the motor body and promotes the flow of refrigerant through the rotor core surface in rotor group 9 and the stator core surface in stator group 8.

[0153] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for regulating the pressure difference between the inside and outside of a motor during refrigerant injection, characterized in that: The motor structure used has the following characteristics: The motor body has a pressure measuring hole (1) and a refrigerant flow channel. The housing (2) is sealed on the outside of the motor body. The housing (2) has a first pressure measuring channel (21), a second pressure measuring channel (22), a gas supply and pressurization channel (23), an exhaust pressure relief channel (24), a refrigerant inlet channel (25), and a refrigerant outlet channel (26). The first pressure measuring channel (21) is connected to the pressure measuring hole (1). The refrigerant inlet channel (25) and the refrigerant outlet channel (26) are both connected to the refrigerant channel. An adjustment cavity is provided between the housing (2) and the motor body. The second pressure measuring channel (22), the gas supply and pressurization channel (23), and the exhaust pressure relief channel (24) are all connected to the adjustment cavity. First pressure testing element (4) and second pressure testing element (5); The steps of the method for regulating the pressure difference between the inside and outside of the motor include: Step 1: Preset the first and second preset values; Step 2: During the refrigerant injection process, the first pressure detection element (4) is used and the air pressure inside the motor body is detected through the pressure measuring hole (1) and the first pressure measuring channel (21), and the first pressure value is output. Step 3: In the process of obtaining the first pressure value, the second pressure detection element (5) is used and the air pressure in the regulating cavity is detected through the second pressure measuring channel (22) to output the second pressure value; Step 4: Compare the first pressure value with the second pressure value and output the comparison result; Step 5: Adjust the pressure difference based on the comparison results, including: When the first pressure value is greater than the second pressure value and the difference between the two is greater than the first predetermined value, the pressure in the regulating cavity is increased through the gas supply pressurization channel (23); When the first pressure value is less than the second pressure value and the difference between the two is greater than the second predetermined value, the pressure in the regulating cavity is reduced through the exhaust pressure relief channel (24).

2. The method for regulating the pressure difference between the inner and outer sides of a motor during refrigerant injection according to claim 1, characterized in that: In step one, a third predetermined value and a fourth predetermined value are preset, wherein the third predetermined value is greater than the first predetermined value and the fourth predetermined value is greater than the second predetermined value; Step five, adjusting the pressure difference based on the comparison results, further includes: When the first pressure value is greater than the second pressure value and the difference between the two is greater than the third predetermined value, the pressure in the regulating cavity is increased through the gas pressurization channel (23), and the refrigerant flow rate in the refrigerant channel is reduced; When the first pressure value is less than the second pressure value and the difference between the two is greater than the fourth predetermined value, the pressure in the regulating cavity is reduced through the exhaust pressure relief channel (24), and the refrigerant flow rate in the refrigerant channel is increased.

3. The method for regulating the pressure difference between the inner and outer sides of a motor during refrigerant injection according to claim 2, characterized in that: In step one, a fifth predetermined value and a sixth predetermined value are preset. The fifth predetermined value is greater than the first predetermined value and less than the third predetermined value, and the sixth predetermined value is greater than the second predetermined value and less than the fourth predetermined value. In step five, after reducing the refrigerant flow rate in the refrigerant channel, when the difference between the first pressure value and the second pressure value is less than the fifth predetermined value, the pressure in the regulating cavity is increased through the gas pressurization channel (23), and the refrigerant flow rate in the refrigerant channel is gradually increased to the initial value. In step five, after increasing the refrigerant flow rate in the refrigerant channel, when the difference between the first pressure value and the second pressure value is less than the sixth predetermined value, the pressure in the regulating cavity is further reduced through the exhaust pressure relief channel (24), and the refrigerant flow rate in the refrigerant channel is gradually reduced to the initial value.

4. A method for regulating the pressure difference between the inner and outer sides of a motor during refrigerant injection according to any one of claims 1-3, characterized in that: The motor body includes a front cover (6), a rear cover (7), a stator assembly (8), a rotor assembly (9), and a sealing assembly (10). Along the axial direction of the motor body, the front end cover (6) and the rear end cover (7) are respectively fixed at the symmetrical ends of the stator assembly (8); The rear cover (7) is provided with a refrigerant inlet (71) and a first refrigerant channel (72) connected together, and the front cover (6) is provided with a refrigerant outlet (61) and a second refrigerant channel (62) connected together. The first refrigerant channel (72) and the second refrigerant channel (62) constitute part of the refrigerant flow channel. The refrigerant inlet flow channel (25) is connected to the first refrigerant channel (72) through the refrigerant inlet (71), and the refrigerant outlet flow channel (26) is connected to the second refrigerant channel (62) through the refrigerant outlet (61). The rotor assembly (9) includes a shaft (91), a front bearing (92) and a rear bearing (93); along the axial direction of the shaft (91), one end of the shaft (91) is rotatably assembled with the front end cover (6) via the front bearing (92), and the other end of the shaft (91) is rotatably assembled with the rear end cover (7) via the rear bearing (93); The sealing assembly (10) is located on the side of the front bearing (92) and the rear bearing (93) to prevent the refrigerant from flowing through the refrigerant channel to the front bearing (92) and the rear bearing (93) during the refrigerant injection process in step two.

5. The method for regulating the pressure difference between the inner and outer sides of a motor during refrigerant injection according to claim 4, characterized in that: The sealing assembly (10) includes: The front seal (101) is sealed between the rotating shaft (91) and the front end cover (6) and is located on the side of the front bearing (92) facing the rear bearing (93) to prevent the refrigerant from flowing to the front bearing (92) through the refrigerant channel during the refrigerant injection process in step two. The rear seal (102) is sealed between the rotating shaft (91) and the rear end cover (7) and is located on the side of the rear bearing (93) facing the front bearing (92) to prevent the refrigerant from flowing to the rear bearing (93) through the refrigerant channel during the refrigerant injection process in step two.

6. The method for regulating the pressure difference between the inner and outer sides of a motor during refrigerant injection according to claim 4, characterized in that: The front cover (6) has a mounting hole (63); The motor body also includes a nut sleeve (100) and a three-phase wiring harness (200). The three-phase wiring harness (200) is connected to the lead wire of the stator assembly (8) through the mounting hole (63) and is sealed to the front end cover (6) through the nut sleeve (100).

7. The method for regulating the pressure difference between the inner and outer sides of a motor during refrigerant injection according to claim 4, characterized in that: Electromagnetic proportional valves are provided at the gas pressurization channel (23), the exhaust pressure relief channel (24), and the refrigerant feed channel (25); The motor structure also includes a pressure control system (300), which is electrically connected to each of the electromagnetic proportional valves to adjust their opening degree during the pressure difference regulation process in step five.

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