A compressor with good heat dissipation effect and its heat dissipation method

Abstract

The present invention relates to a compressor with good heat dissipation effect and its heat dissipation method. The compressor includes a housing with a hollow interior, a stator assembly assembled inside the housing, and a rotor assembly disposed within the stator assembly. The rotor assembly includes a rotating shaft; a volute connected to the housing and having an air compression chamber inside, an impeller disposed in the air compression chamber, and one end of the rotating shaft is drivingly connected to the impeller; characterized in that: a through hole is formed inside the rotating shaft and runs through along its length direction, and a rotor heat dissipation pipeline is provided in the through hole, and a housing heat dissipation channel is formed inside the housing; both ends of the rotor heat dissipation pipeline are respectively communicated with the outlet of a circulating cooler and the first end of the housing heat dissipation channel, and the second end of the housing heat dissipation channel is communicated with the inlet of the circulating cooler; under the action of the circulating cooler, the coolant circulates in the rotor heat dissipation pipeline and the housing heat dissipation channel, thereby comprehensively dissipating heat from the stator assembly and the rotor assembly.

Description

Technical Field

[0001] The present invention relates to a compressor, and particularly to a compressor with good heat dissipation effect and its heat dissipation method. Background Art

[0002] As a common rotating electromechanical device, a compressor mainly drives an impeller to rotate at the motor shaft end to compress low-pressure gas into the required high-pressure gas. High-speed motors with high power density such as magnetic levitation bearings and air bearings have the advantages of non-contact, small friction resistance, and no need for a gearbox, and are very suitable for directly driving the impeller to rotate. However, the high power density brings about a relatively high temperature rise of the stator and rotor, and corresponding cooling technologies need to be adopted to cool the stator and rotor.

[0003] At present, stator heat dissipation can be achieved by setting a cooling flow channel on the stator housing and then flowing a coolant (such as cooling water or cooling oil) through the cooling flow channel. This technology is relatively easy to implement, technically mature, and widely used. However, the motor rotor rotates at a high speed and is located inside the motor, and the space inside the motor is limited, making it difficult to dissipate heat. Currently, the commonly used method is to use a hollow shaft for the rotating shaft, with holes opened on the rotating shaft. Due to the limitation of the structural size, the aperture is not suitable to be too large, and the rotating shaft is mostly slender, resulting in poor fluidity of gas in the holes of the rotating shaft and poor heat dissipation effect of the rotor. Therefore, the existing compressor heat dissipation technology needs to be further improved. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a compressor that can comprehensively dissipate heat from the stator and rotor to ensure a good heat dissipation effect in view of the above-mentioned prior art.

[0005] The second technical problem to be solved by the present invention is to provide a heat dissipation method for a compressor that can comprehensively dissipate heat from the stator and rotor to ensure a good heat dissipation effect in view of the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the above first technical problem is as follows: A compressor with good heat dissipation effect, including a power drive part and an air compression part connected to the power drive part. The power drive part includes a housing with a hollow interior, a drive motor installed inside the housing. The drive motor includes a stator assembly assembled inside the housing and a rotor assembly arranged inside the stator assembly. The rotor assembly includes a rotating shaft. The air compression part includes a volute with an air compression chamber formed inside, an impeller arranged inside the air compression chamber, and one end of the rotating shaft is drivingly connected to the impeller. It is characterized in that: A through hole running through along its length direction is formed inside the rotating shaft, and a rotor heat dissipation pipeline is arranged inside the through hole. A housing heat dissipation channel for cooling the stator assembly is formed inside the housing. The first end of the rotor heat dissipation pipeline is communicated with the outlet of a circulating cooler through a pipeline, the second end of the rotor heat dissipation pipeline is communicated with the first end of the housing heat dissipation channel, and the second end of the housing heat dissipation channel is communicated with the inlet of the circulating cooler through a pipeline. Under the action of the circulating cooler, the coolant circulates inside the rotor heat dissipation pipeline and the housing heat dissipation channel, thereby comprehensively dissipating heat from the stator assembly and the rotor assembly.

[0007] For the convenience of component processing and overall machine assembly, one end of the housing is fixedly connected with an end cover, and the volute is fixedly connected to the other end of the housing. The housing heat dissipation channel includes an end cover heat dissipation channel formed inside the end cover and a spiral channel formed inside the housing and distributed along the length direction of the housing. The second end of the rotor heat dissipation pipeline is communicated with the first end of the end cover heat dissipation channel, the second end of the end cover heat dissipation channel is communicated with the first end of the spiral channel, and the second end of the spiral channel is communicated with the inlet of the circulating cooler through a pipeline.

[0008] To ensure the heat dissipation effect and the monitoring of the heat dissipation effect of the stator and rotor, a rotor temperature measuring element is arranged inside the rotor assembly or on the rotor heat pipeline, and a stator temperature measuring element is arranged inside the stator assembly. The rotor temperature measuring element and the stator temperature measuring element are both communicatively connected to a controller. In addition, a two-position four-way electromagnetic reversing valve is included. When the two-position four-way electromagnetic reversing valve is opened forward, its first communication port is communicated with the third communication port, and the second communication port is communicated with the fourth communication port. When the two-position four-way electromagnetic reversing valve is opened in reverse, its first communication port is communicated with the fourth communication port, and the second communication port is communicated with the third communication port. The outlet of the circulating cooler is communicated with the first communication port of the two-position four-way electromagnetic reversing valve, the inlet of the circulating cooler is communicated with the second communication port of the two-position four-way electromagnetic reversing valve, the first end of the rotor heat dissipation pipeline is communicated with the third communication port of the two-position four-way electromagnetic reversing valve through a pipeline, and the second end of the housing heat dissipation channel is communicated with the fourth communication port of the two-position four-way electromagnetic reversing valve through a pipeline. The two-position four-way electromagnetic reversing valve is communicatively connected to the controller, and the controller controls the reversing of the two-position four-way electromagnetic reversing valve according to the rotor temperature and stator temperature measured by the rotor temperature measuring element and the stator temperature measuring element.

[0009] As a further improvement, the circulating cooler is also communicatively connected with the controller, and the controller will control the circulating cooler to start only when either the rotor temperature or the stator temperature is greater than the first preset temperature; when either the rotor temperature or the stator temperature is greater than the first preset temperature, and the rotor temperature is greater than or equal to the stator temperature, the controller controls the two-position four-way electromagnetic reversing valve to open in the forward direction, at which time the coolant preferentially dissipates heat to the rotor assembly, and at this time the coolant flowing out of the circulating cooler preferentially passes through the rotor heat dissipation channel, and then flows back to the circulating cooler through the casing heat dissipation channel; when either the rotor temperature or the stator temperature is greater than the first preset temperature, and the stator temperature is greater than the rotor temperature, the controller controls the two-position four-way electromagnetic reversing valve to open in the reverse direction, at which time the coolant preferentially dissipates heat to the stator assembly, and at this time the coolant flowing out of the circulating cooler preferentially passes through the casing heat dissipation channel, and then flows back to the circulating cooler through the rotor heat dissipation channel.

[0010] As a further improvement, the inner wall of the through hole of the rotating shaft is provided with spiral guide grooves distributed along the length direction of the rotating shaft, which drive the airflow from the inlet end of the through hole to the outlet end when the rotating shaft rotates; at the same time, an exhaust fan is arranged outside the outlet end of the through hole of the rotating shaft, and the inlet end of the through hole of the rotating shaft is connected to the outside, and the external gas flows from the inlet end of the through hole of the rotating shaft to the outlet end, forming a first airflow cooling channel. The setting of the first airflow cooling channel can accelerate the flow of gas to increase the energy convection intensity between the rotor heat dissipation pipeline and the first airflow cooling channel while the gas flow takes away the heat of the rotating shaft.

[0011] Further improvement, the stator assembly is provided with ventilation holes, the housing is provided with an inlet fan at one side of the stator assembly, the housing is provided with an exhaust fan at the other side of the stator assembly, the housing is provided with an air inlet in the circumferential direction corresponding to the inlet fan, and under the action of the exhaust fan and the inlet fan, external air enters from the air inlet on the housing, and then flows through the ventilation holes on the stator assembly to form a second airflow cooling channel. The second airflow cooling channel can dissipate heat from the stator assembly and the components on both sides of the air gap between the stator assembly and the shaft assembly.

[0012] As a further improvement, the shaft is provided with a shaft ventilation hole connecting the through hole and the outside of the shaft, and the shaft ventilation hole is opened along the tangent direction of the airflow to facilitate the airflow to flow along the rotation direction of the shaft. The shaft assembly is also provided with an air vent connecting the shaft ventilation hole and the outside of the shaft assembly. The air vent can allow the cooling airflow to cool the inside of the shaft assembly, and can also connect the first airflow cooling channel with the second airflow cooling channel.

[0013] As a further improvement, a plurality of shaft ventilation holes are provided, and the plurality of shaft ventilation holes are distributed in a spiral line on the shaft, which can minimize the weakening of the strength of the shaft.

[0014] Further improvement: The circulating cooler, two-position four-way electromagnetic reversing valve and controller are all arranged on the machine shell; an air inlet pipe communicating with the air compression chamber is hermetically connected to the volute, and a compressed gas discharge port communicating with the air compression chamber is also opened on the volute.

[0015] The technical solution adopted by the present invention to solve the above second technical problem is as follows: A heat dissipation method for a compressor having the above structure, characterized in that:

[0016] When both the stator temperature T1 and the rotor temperature T2 are less than or equal to the first preset temperature, the first preset temperature is taken as 55°C to 65°C, the controller controls the circulating cooler to close;

[0017] When any one of the stator temperature T1 and the rotor temperature T2 is greater than the first preset temperature, and both the stator temperature T1 and the rotor temperature T2 are less than the second preset temperature, the second preset temperature is taken as 95°C to 105°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V, and then flows through the machine shell heat dissipation channel and then returns to the circulating cooler;

[0018] When any one of the stator temperature T1 and the rotor temperature T2 is greater than the first preset temperature, and both the stator temperature T1 and the rotor temperature T2 are less than the second preset temperature, the second preset temperature is taken as 95°C to 105°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open reversely, so that the coolant first flows through the machine shell heat dissipation channel at a flow rate V, and then flows through the rotor heat dissipation pipeline and then returns to the circulating cooler, and the flow rate V is a preset constant;

[0019] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the second preset temperature and less than the third preset temperature, the third preset temperature is taken as 115°C to 125°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V*K1, and then flows through the machine shell heat dissipation channel and then returns to the circulating cooler, where K1 is a constant with a value of 1.1 to 1.3;

[0020] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the second preset temperature and less than the third preset temperature, the third preset temperature is taken as 115°C to 125°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open reversely, so that the coolant first flows through the machine shell heat dissipation channel at a flow rate V*K1, and then flows through the rotor heat dissipation pipeline and then returns to the circulating cooler, where K1 is a constant with a value of 1.1 to 1.3;

[0021] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the third preset temperature and less than the fourth preset temperature, the fourth preset temperature ranges from 135°C to 145°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate of V*K2, and then flows through the housing heat dissipation channel and then returns to the circulating cooler, where K2 is a constant with a value of 1.3 to 1.5;

[0022] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the third preset temperature and less than the fourth preset temperature, the fourth preset temperature ranges from 135°C to 145°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open in the reverse direction, so that the coolant first flows through the housing heat dissipation channel at a flow rate of V*K2, and then flows through the rotor heat dissipation pipeline and then returns to the circulating cooler, where K2 is a constant with a value of 1.3 to 1.5;

[0023] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the fourth preset temperature, the controller outputs to the alarm system and forcibly controls the entire compressor to stop working.

[0024] Compared with the prior art, the advantages of the present invention are as follows: the rotating shaft is set as a hollow shaft, the rotor heat dissipation pipeline is arranged through the through hole of the rotating shaft, the housing heat dissipation channel is arranged in the housing, the rotor heat dissipation pipeline and the housing heat dissipation channel are connected, and then connected to the inlet and outlet of the circulating cooler. The coolant can circulate in the rotor heat dissipation pipeline and the housing heat dissipation channel, so that both the rotor assembly and the stator assembly can be dissipated, with low heat dissipation cost and good effect; in the improved scheme, by setting the first air flow cooling channel and the second air flow cooling channel, while using the coolant to cool the stator and rotor, the air flow is also used to cool the rotor assembly and the stator assembly, which can simultaneously achieve a good cooling effect on the stator and rotor. Description of the Drawings

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the compressor in the embodiment of the present invention.

[0026] Figure 2 It is a three-dimensional sectional view of the compressor in the embodiment of the present invention.

[0027] Figure 3 It is a three-dimensional structural schematic diagram of the stator assembly in the embodiment of the present invention.

[0028] Figure 4 It is a three-dimensional structural schematic diagram of the rotor assembly in the embodiment of the present invention.

[0029] Figure 5 This is a cross-sectional view of the rotor assembly in an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram showing the direction of the coolant flowing forward in the compressor in an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram showing the direction of the coolant flowing backward in the compressor in an embodiment of the present invention.

[0032] Figure 8 This is a schematic diagram showing the flow direction of the first air-cooling channel in the compressor in an embodiment of the invention.

[0033] Figure 9 This is a schematic diagram showing the flow direction of the second air-cooling channel in the compressor in an embodiment of the invention. Detailed implementation manners

[0034] The present invention will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0035] As Figure 1 、 2 shown, the compressor includes a power driving part and an air compression part connected to the power driving part. The power driving part includes a housing 4 with a hollow interior, a driving motor installed inside the housing 4. The driving motor includes a stator assembly 1 assembled inside the housing and a rotor assembly 2 arranged inside the stator assembly.

[0036] The stator assembly 1 includes a stator core 1-1, a stator coil 1-2, a stator temperature measuring element 1-3, a stator bar 1-4, a stator retaining clip 1-5, a stator retaining ring 1-6 and a stator key 1-7, as shown in Figure 3 shown. The stator coil 1-2 is arranged inside the stator core 1-1; the stator bar 1-4 is fixed outside the stator core 1-1 through the stator retaining clip 1-5, the stator retaining ring 1-6 is arranged outside the stator bar 1-4, and the stator key 1-7 is arranged on the stator retaining ring 1-6; the stator temperature measuring element 1-3 is arranged on the stator coil 1-2; a rotor assembly installation space is formed inside the stator coil 1-2, and the rotor assembly 2 is installed in the rotor assembly installation space, and there is a certain gap between the rotor assembly 2 and the inner wall of the rotor assembly installation space.

[0037] The rotor assembly 2 includes a rotating shaft 2-1, a rotor permanent magnet assembly 2-2, and a threaded ring 2-3. The rotor permanent magnet assembly 2-2 further includes a sheath 2-2-1 and rotor permanent magnets 2-2-2. The rotor permanent magnet assembly 2-2 is sleeved outside the rotating shaft 2-1 through the threaded ring 2-3. A through hole 2-1-1 is formed inside the rotating shaft 2-1 and runs through it along its length direction. A spiral flow guide groove 2-1-2 is formed on the inner wall of the through hole 2-1-1 and is distributed along the length direction of the rotating shaft. A rotating shaft ventilation hole 2-1-3 is formed on the rotating shaft 2-1 to communicate the through hole 2-1-1 with the outside of the rotating shaft. The rotating shaft ventilation hole 2-1-3 is opened along the tangential direction of the air flow to facilitate the air flow to flow along the rotating direction of the rotating shaft. There are multiple rotating shaft ventilation holes 2-1-3, and the multiple rotating shaft ventilation holes 2-1-3 are distributed in a spiral on the rotating shaft 2-1, which can minimize the weakening of the strength of the rotating shaft 2-1. A ventilation hole 2-2-3 is formed on the rotor permanent magnet assembly 2-2 to communicate the rotating shaft ventilation hole 2-1-3 with the outside of the rotor assembly. The ventilation hole 2-2-3 can allow the cooling air flow to cool the inside of the rotor assembly. See Figure 4 , 5 as shown. The inner circle of the threaded ring 2-3 is in a stepped form. The non-threaded part is fitted with the outer circle of the shoulder of the rotating shaft 2-1 to play a positioning role. The threaded part is fitted with the threaded part of the rotating shaft 2-1 to press the sheath 2-2-1 and the rotor permanent magnets 2-2-2 to prevent them from being thrown out and disengaged when the rotating shaft 2-1 rotates at high speed.

[0038] Both sides of the housing 4 are open. A end cover 8 is fixedly connected to the housing 4 at one opening side. A sealing ring 33 is provided between the end cover 8 and the housing 4, and the method of pressing the sealing ring is used to prevent the leakage of the cooling liquid.

[0039] The housing 4 is fixedly connected to the volute in the air compression part at the other opening side. A controller 31, a circulating cooler 13, and a two-position four-way electromagnetic reversing valve 12 are fixed to the top of the housing 4. An end cover heat dissipation channel 8-1 is formed inside the end cover 8, and a spiral channel 4-1 distributed along the length direction of the housing is formed inside the housing 4. When the end cover 8 is fixedly connected to the housing 4, the second end of the end cover heat dissipation channel 8-1 is communicated with the first end of the spiral channel 4-1.

[0040] The rotor heat dissipation pipeline 9 is disposed through the through hole 2-1-1 of the rotating shaft 2-1. The first end of the rotor heat dissipation pipeline 9 is communicated with the first end of the second bent heat dissipation pipeline 25 through a joint. The second end of the second bent heat dissipation pipeline 25 is communicated with the third communication port of the two-position four-way electromagnetic reversing valve 12. The second end of the rotor heat dissipation pipeline 9 is communicated with the first end of the end cover heat dissipation channel 8-1. The second end of the end cover heat dissipation channel 8-1 is communicated with the first end of the spiral channel 4-1. The second end of the spiral channel 4-1 is communicated with the first end of the first bent heat dissipation pipeline 11 through a joint. The second end of the first bent heat dissipation pipeline 11 is communicated with the fourth communication port of the two-position four-way electromagnetic reversing valve 12. The outlet of the circulating cooler 13 is communicated with the first communication port of the two-position four-way electromagnetic reversing valve 12. The inlet of the circulating cooler 13 is communicated with the second communication port of the two-position four-way electromagnetic reversing valve 12. When the two-position four-way electromagnetic reversing valve 12 is opened forward, its first communication port is communicated with the third communication port, and its second communication port is communicated with the fourth communication port. When the two-position four-way electromagnetic reversing valve 12 is opened in reverse, its first communication port is communicated with the fourth communication port, and its second communication port is communicated with the third communication port.

[0041] In this embodiment, a rotating shaft temperature measuring element 30 is placed on the rotor heat dissipation pipeline 9. The rotating shaft temperature measuring element 30 is preferably an infrared temperature measuring element, which can perform non-contact temperature measurement on the internal temperature of the rotating shaft 2-1. The temperature measurement signal is finally transmitted to the controller 31 through the wire groove on the rotor heat dissipation pipeline 9. At the same time, a stator temperature measuring element 1-3 is arranged on the stator coil 1-2 of the stator assembly 1. The measurement signal of the stator temperature measuring element 1-3 is also transmitted to the controller 31. The controller 31 controls the opening direction of the two-position four-way electromagnetic reversing valve 12 and the flow rate of the coolant in the circulating cooler according to the rotor temperature T2 and the stator temperature T1 measured by the rotor temperature measuring element and the stator temperature measuring element.

[0042] The control method of the controller for liquid cooling heat dissipation is specifically as follows:

[0043] When both the stator temperature T1 and the rotor temperature T2 are less than or equal to the first preset temperature, the first preset temperature ranges from 55°C to 65°C, preferably 60°C, the controller controls the circulating cooler to be closed;

[0044] When any one of the stator temperature T1 and the rotor temperature T2 is greater than the first preset temperature, and both the stator temperature T1 and the rotor temperature T2 are less than the second preset temperature, the second preset temperature ranges from 95°C to 105°C, preferably 100°C, and when the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to be opened, and the controller controls the two-position four-way electromagnetic reversing valve to be opened forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V, and then flows through the housing heat dissipation channel and then returns to the circulating cooler. The flow direction of the coolant is shown by the arrow direction in Figure 6 as shown in the arrow direction;

[0045] When any one of the stator temperature T1 and the rotor temperature T2 is greater than the first preset temperature, and both the stator temperature T1 and the rotor temperature T2 are less than the second preset temperature, the second preset temperature ranges from 95°C to 105°C, preferably 100°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to reverse and open, so that the coolant first flows through the housing heat dissipation channel at a flow rate V, and then flows through the rotor heat dissipation pipeline and then returns to the circulating cooler, and the flow rate V is a preset constant; for the coolant flow direction, see Figure 7 the arrow direction shown in

[0046] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the second preset temperature and less than the third preset temperature, the third preset temperature ranges from 115°C to 125°C, preferably 120°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V*K1, and then flows through the housing heat dissipation channel and then returns to the circulating cooler, where K1 is a constant with a value ranging from 1.1 to 1.3;

[0047] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the second preset temperature and less than the third preset temperature, the third preset temperature ranges from 115°C to 125°C, preferably 120°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to reverse and open, so that the coolant first flows through the housing heat dissipation channel at a flow rate V*K1, and then flows through the rotor heat dissipation pipeline and then returns to the circulating cooler, where K1 is a constant with a value ranging from 1.1 to 1.3, preferably 1.2;

[0048] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the third preset temperature and less than the fourth preset temperature, the fourth preset temperature ranges from 135°C to 145°C, preferably 140°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V*K2, and then flows through the housing heat dissipation channel and then returns to the circulating cooler, where K2 is a constant with a value ranging from 1.3 to 1.5, preferably 1.4;

[0049] When any temperature of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the third preset temperature and less than the fourth preset temperature, the fourth preset temperature is 135°C to 145°C, preferably 140°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic reversing valve to switch on, so that the coolant flows through the heat dissipation channel of the casing at a flow rate of V*K2, then flows through the rotor heat dissipation pipeline and then flows back to the circulating cooler, wherein the value of K2 is a constant of 1.3 to 1.5, preferably 1.4;

[0050] When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to a fourth preset temperature, the controller outputs an alarm system to force the entire compressor to stop working.

[0051] The air compression part includes a volute with an air compression chamber inside. The volute is formed by sealing and assembling a first volute 20 and a second volute 21. An impeller 22 is arranged in the air compression chamber of the volute. One end of the rotating shaft 2-1 passes through the first volute 20 in a sealed manner and is drivingly connected to the impeller 22. The second volute 21 is sealed and connected with an air inlet pipe 26 communicating with the air compression chamber. After the first volute 20 and the second volute 21 are sealed and assembled, a compressed gas discharge port 24 communicating with the air compression chamber is opened on its outer wall. The inner sealing ring 17 is pressed and fixed on the shoulder of the rotating shaft 2-1. The outer sealing ring 18 is inserted into the gap of the inner sealing ring 17 and then fixed to the first volute 20 by bolts. The contact part between the air inlet pipe 26 and the second volute 21 is also prevented from air leakage by means of a compression seal 32; except for the air inlet and the air outlet, there will be no air leakage or air leakage in the air compression chamber, so the compression ratio of the impeller can be guaranteed.

[0052] In this embodiment, a plurality of exhaust ports are provided on the end cover 8, each of which is provided with an exhaust fan 15, and a plurality of inlet fans 36 are provided inside the casing on the side close to the volute. Since the inner wall of the through hole 2-1-1 of the rotating shaft 2-1 is provided with a spiral guide groove 2-1-2 distributed along the length direction of the rotating shaft 2-1, when the rotating shaft 2-1 rotates, the air flow is driven from the inlet end of the through hole 2-1-1 to the outlet end. The inlet end of the through hole 2-1-1 is located in the air compression chamber of the volute and is connected to the outside through the air inlet pipe 26. The outlet end of the through hole 2-1-1 is close to the end cover 8 and has a certain gap with the end cover 8; the external gas flows from the inlet end of the through hole of the rotating shaft 2-1 to the outlet end, forming a first air flow cooling channel, see Figure 8 The first airflow cooling channel is provided so that the gas flow can take away the heat of the rotating shaft 2-1, and the accelerated flowing gas can increase the energy convection intensity between the rotor heat dissipation pipeline 9 and the first airflow cooling channel.

[0053] In this embodiment, ventilation holes 1-1-1 penetrating the stator core 1-1 in its length direction are provided. The housing 4 is provided with an air inlet 4-2 in the circumferential direction corresponding to the intake fan 36. Under the action of the exhaust fan and the intake fan, external gas enters from the air inlet 4-2 on the housing 4, and then flows through the ventilation holes 1-1-1 on the stator core 1-1, forming a second air flow cooling channel. See Figure 9 as shown. The setting of the second air flow cooling channel can dissipate heat from the stator assembly and the components on both sides of the air gap between the stator assembly and the rotating shaft assembly.

[0054] Since a spiral guide groove 2-1-2 is provided on the inner wall of the through hole 2-1-1 of the rotating shaft 2-1, a rotating shaft ventilation hole 2-1-3 communicating the through hole with the outside of the rotating shaft is provided on the rotating shaft 2-1. The rotating shaft ventilation hole 2-1-3 is provided along the tangential direction of the air flow, facilitating the air flow to flow along the rotating direction of the rotating shaft; a ventilation hole 2-2-1 communicating the rotating shaft ventilation hole 2-1-3 with the outside of the rotating shaft assembly is provided on the rotor permanent magnet assembly 2-2. The ventilation hole 2-2-1 can enable the cooling air flow to cool components such as the permanent magnet 2-2-2 and the sheath 2-2-1 inside the rotating shaft assembly 2, and can also connect the first air flow cooling channel and the second air flow cooling channel, so as to better dissipate heat from the stator assembly and the rotating shaft assembly.

[0055] The assembly steps of the compressor in this embodiment are as follows:

[0056] First, install the stator assembly 1: Assemble components such as the stator core 1-1 and the stator coil 1-2 into the stator assembly 1, then assemble the stator assembly 1 from one side opening of the fixed end cover 8 onto the housing 4. After the A bearing seat 5 is fixed to the housing 4 by bolts, the fixed bearing 3 and the bearing cover 7 are placed in sequence; then the end cover 8 is fixed to the one side opening of the housing 4, and then the exhaust fan 15 and the filter net 40 are fixed on the end cover 8. The filter net 40 plays a role in safety and filtration.

[0057] Then, assemble the rotating shaft assembly 2 into the rotor assembly installation space inside the stator assembly 1;

[0058] Then, install the rotor heat dissipation pipeline 9. First, bond the rotating shaft temperature measuring element 30 to the rotor heat dissipation pipeline 9 with structural adhesive, then insert the rotor heat dissipation pipeline 9 from the inlet end of the through hole 2-1-1 of the rotating shaft 2-1, and let it pass out from the outlet end of the through hole 2-1-1 of the rotating shaft 2-1, and connect it to the end cover 8 through end threads, so that the rotor heat dissipation pipeline 9 is communicated with the end cover heat dissipation channel 8-1.

[0059] After the rotating shaft assembly 2 is placed in the rotor assembly installation space inside the stator assembly 1, the B bearing seat 6 is assembled through the stepped positioning of the housing 4, and then the intake fan 36, the bearing and the bearing cover are installed in sequence.

[0060] The inner seal ring 17 and the outer seal ring 18 are assembled into a whole and fitted to the step stop of the first volute 20, and then integrally fitted to the opening on the other side of the casing 4 through bolts. Then, the corrugated washer 34 is also placed on the outer cylindrical surface of the rotating shaft 2-1;

[0061] Subsequently, the impeller 22 is installed. The impeller 22 is positioned by the shoulder of the rotating shaft 2-1, and the impeller 22 is fixed to the rotating shaft 2-1 through the impeller fixing nut 23. A corrugated washer 34 is provided between the impeller 22 and the inner seal ring 17. When the impeller 34 is pressed, the corrugated washer 34 is stressed and thus presses the inner seal ring 17, enabling the inner seal ring 17 to rotate synchronously with the rotor assembly 2, and the inner seal ring 17 has no contact with the outer seal ring 18. The cooperation of the inner and outer seal rings plays a sealing role.

[0062] The second volute 21 is positioned by the stop and fixed to the first volute 20 through bolts. Before fastening, a rubber pad 29 is laid between the corresponding surfaces of the first volute 20 and the second volute 21 to prevent air leakage.

[0063] The second bent cooling pipe 25 is connected to the first end of the rotor cooling pipe 9 through a joint. Then, the intake pipe 26 and the second volute 21 are positioned by the stop and pressed on the second volute 21; Sealing gaskets are placed between the contact surfaces of the intake pipe 26 and the second bent cooling pipe 25 and between the outer cylindrical surface of the inlet end of the intake pipe 26 and the second volute 21 to prevent air leakage.

[0064] Finally, parts such as the circulating cooler 13, the controller 31, and the two-position four-way electromagnetic reversing valve 12 are installed on the upper side of the top of the casing 4.

Claims

1. A compressor with good heat dissipation effect, comprising a power drive part and an air compression part connected to the power drive part. The power drive part includes a housing with a hollow interior, a drive motor installed inside the housing. The drive motor includes a stator assembly assembled inside the housing and a rotor assembly arranged inside the stator assembly. The rotor assembly includes a rotating shaft; the air compression part includes a volute with an air compression chamber inside, an impeller arranged in the air compression chamber, and one end of the rotating shaft is drivingly connected to the impeller; characterized in that: A through hole extending along the length direction is formed inside the rotating shaft, and a rotor heat dissipation pipeline is arranged in the through hole. An outer casing heat dissipation channel for cooling the stator assembly is formed inside the outer casing. The first end of the rotor heat dissipation pipeline is communicated with the outlet of a circulating cooler through a pipeline, the second end of the rotor heat dissipation pipeline is communicated with the first end of the outer casing heat dissipation channel, and the second end of the outer casing heat dissipation channel is communicated with the inlet of the circulating cooler through a pipeline. Under the action of the circulating cooler, the coolant circulates in the rotor heat dissipation pipeline and the outer casing heat dissipation channel, so as to comprehensively dissipate heat from the stator assembly and the rotor assembly. A rotor temperature measuring element is arranged inside the rotor assembly or on the rotor heat pipeline, and a stator temperature measuring element is arranged inside the stator assembly. The rotor temperature measuring element and the stator temperature measuring element are both communicatively connected to a controller. In addition, a two-position four-way electromagnetic reversing valve is further included. When the two-position four-way electromagnetic reversing valve is opened forward, its first communication port is communicated with the third communication port, and its second communication port is communicated with the fourth communication port. When the two-position four-way electromagnetic reversing valve is opened in the reverse direction, its first communication port is communicated with the fourth communication port, and its second communication port is communicated with the third communication port. The outlet of the circulating cooler is communicated with the first communication port of the two-position four-way electromagnetic reversing valve, the inlet of the circulating cooler is communicated with the second communication port of the two-position four-way electromagnetic reversing valve, the first end of the rotor heat dissipation pipeline is communicated with the third communication port of the two-position four-way electromagnetic reversing valve through a pipeline, and the second end of the outer casing heat dissipation channel is communicated with the fourth communication port of the two-position four-way electromagnetic reversing valve through a pipeline. The two-position four-way electromagnetic reversing valve is communicatively connected to the controller, and the controller controls the two-position four-way electromagnetic reversing valve to reverse according to the rotor temperature and the stator temperature measured by the rotor temperature measuring element and the stator temperature measuring element. The inner wall of the through hole of the rotating shaft is provided with spiral diversion grooves distributed along the length direction of the rotating shaft. When the rotating shaft rotates, it drives the air flow to flow from the inlet end of the through hole to the outlet end. At the same time, an exhaust fan is arranged outside the outlet end of the through hole of the rotating shaft. The inlet end of the through hole of the rotating shaft is communicated with the outside, and the outside gas flows from the inlet end of the through hole of the rotating shaft to the outlet end, forming a first air flow cooling channel.

2. The compressor with good heat dissipation effect according to claim 1, wherein: One end of the outer casing is fixedly connected with an end cover, and the volute is fixedly connected to the other end of the outer casing. The outer casing heat dissipation channel includes an end cover heat dissipation channel formed inside the end cover and a spiral channel formed inside the outer casing and distributed along the length direction of the outer casing. The second end of the rotor heat dissipation pipeline is communicated with the first end of the end cover heat dissipation channel, the second end of the end cover heat dissipation channel is communicated with the first end of the spiral channel, and the second end of the spiral channel is communicated with the inlet of the circulating cooler through a pipeline.

3. The compressor with good heat dissipation effect according to claim 1, characterized in that: The circulating cooler is also communicatively connected to the controller. Only after any one of the rotor temperature and the stator temperature is greater than the first preset temperature will the controller control the circulating cooler to start. When any one of the rotor temperature and the stator temperature is greater than the first preset temperature and the rotor temperature is greater than or equal to the stator temperature, the controller controls the two-position four-way electromagnetic directional valve to open forward. At this time, the coolant preferentially dissipates heat from the rotor assembly. At this time, the coolant flowing out of the circulating cooler first passes through the rotor heat dissipation pipeline and then through the housing heat dissipation channel before flowing back to the circulating cooler. When any one of the rotor temperature and the stator temperature is greater than the first preset temperature and the stator temperature is greater than the rotor temperature, the controller controls the two-position four-way electromagnetic directional valve to open reversely. At this time, the coolant preferentially dissipates heat from the stator assembly. At this time, the coolant flowing out of the circulating cooler first passes through the housing heat dissipation channel and then through the rotor heat dissipation pipeline before flowing back to the circulating cooler.

4. The compressor with good heat dissipation effect according to claim 1, wherein: Ventilation holes are provided on the stator assembly. An intake fan is provided on one side of the stator assembly inside the housing, and an exhaust fan is provided on the other side of the stator assembly inside the housing. An air inlet is provided on the housing in the circumferential direction corresponding to the intake fan. Under the action of the exhaust fan and the intake fan, external air enters from the air inlet on the housing and then flows through the ventilation holes on the stator assembly, forming a second air flow cooling channel.

5. The compressor with good heat dissipation effect according to claim 4, characterized in that: Axial ventilation holes communicating the through hole with the outside of the shaft are provided on the shaft. The axial ventilation holes are provided along the tangential direction of the air flow to facilitate the air flow to flow along the rotation direction of the shaft. A ventilation hole communicating the axial ventilation hole with the outside of the shaft assembly is further provided inside the shaft assembly. The ventilation hole can cool the inside of the shaft assembly with the cooling air flow and can also connect the first air flow cooling channel and the second air flow cooling channel.

6. The compressor with good heat dissipation effect according to claim 5, wherein: A plurality of axial ventilation holes are provided, and the plurality of axial ventilation holes are distributed in a spiral on the shaft.

7. The compressor with good heat dissipation effect according to claim 1, characterized in that: The circulating cooler, the two-position four-way electromagnetic directional valve and the controller are all arranged on the housing; an air inlet pipe communicating with the air compression chamber is hermetically connected to the volute, and a compressed gas discharge port communicating with the air compression chamber is further provided on the volute.

8. A heat dissipation method for a compressor with good heat dissipation effect as described in claim 3, characterized in that: When both the stator temperature T1 and the rotor temperature T2 are less than or equal to the first preset temperature, and the first preset temperature ranges from 55°C to 65°C, the controller controls the circulating cooler to close; When any one of the stator temperature T1 and the rotor temperature T2 is greater than the first preset temperature, and both the stator temperature T1 and the rotor temperature T2 are less than the second preset temperature, and the second preset temperature ranges from 95°C to 105°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic directional valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V and then through the housing heat dissipation channel before flowing back to the circulating cooler; When any one of the stator temperature T1 and the rotor temperature T2 is greater than the first preset temperature, and both the stator temperature T1 and the rotor temperature T2 are less than the second preset temperature, the second preset temperature ranges from 95°C to 105°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic directional valve to change direction and open, so that the coolant first flows through the housing heat dissipation channel at a flow rate V and then through the rotor heat dissipation pipeline and then flows back to the circulating cooler, and the flow rate V is a preset constant; When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the second preset temperature and less than the third preset temperature, the third preset temperature ranges from 115°C to 125°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic directional valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V*K1 and then through the housing heat dissipation channel and then flows back to the circulating cooler, where K1 is a constant with a value ranging from 1.1 to 1.3; When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the second preset temperature and less than the third preset temperature, the third preset temperature ranges from 115°C to 125°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic directional valve to change direction and open, so that the coolant first flows through the housing heat dissipation channel at a flow rate V*K1 and then through the rotor heat dissipation pipeline and then flows back to the circulating cooler, where K1 is a constant with a value ranging from 1.1 to 1.3; When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the third preset temperature and less than the fourth preset temperature, the fourth preset temperature ranges from 135°C to 145°C, and the stator temperature T1 is less than or equal to the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic directional valve to open forward, so that the coolant first flows through the rotor heat dissipation pipeline at a flow rate V*K2 and then through the housing heat dissipation channel and then flows back to the circulating cooler, where K2 is a constant with a value ranging from 1.3 to 1.5; When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the third preset temperature and less than the fourth preset temperature, the fourth preset temperature ranges from 135°C to 145°C, and the stator temperature T1 is greater than the rotor temperature T2, the controller controls the circulating cooler to start, and the controller controls the two-position four-way electromagnetic directional valve to change direction and open, so that the coolant first flows through the housing heat dissipation channel at a flow rate V*K2 and then through the rotor heat dissipation pipeline and then flows back to the circulating cooler, where K2 is a constant with a value ranging from 1.3 to 1.5; When any one of the stator temperature T1 and the rotor temperature T2 is greater than or equal to the fourth preset temperature, the controller outputs an alarm system and forcibly controls the entire compressor to stop working.

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