Integrated compressor and heat dissipation control device and method thereof

Abstract

The invention belongs to the technical field of integrated compressors, and discloses an integrated compressor and a heat dissipation control device and method.The device is characterized in that a first heat dissipation flow channel is arranged for a motor part, and a first throttling device is arranged at a refrigerant air inlet of the first heat dissipation flow channel; a second heat dissipation flow channel is arranged for the frequency converter part, and a second throttling device is arranged at a refrigerant air inlet of the second heat dissipation flow channel; the sampling unit is used for sampling the temperature of the motor part and the temperature of the frequency converter part; the control unit is used for carrying out PI adjustment on the opening degree of the first throttling device according to the temperature of the motor part; and according to the temperature of the frequency converter part, PI adjustment is conducted on the opening degree of the second throttling device, so that heat dissipation control over the integrated compressor is achieved. According to the scheme, the heat dissipation flow channel and the throttling device are arranged for the frequency converter part and the motor part respectively, PI control is conducted on the opening degree of the corresponding throttling device according to the sampling temperature, the temperature is reduced, fluctuation is small, and operation stability and safety are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated compressors, and in particular relates to a heat dissipation control device for an integrated compressor, an integrated compressor having the heat dissipation control device, and a heat dissipation control method for the integrated compressor. Background Art

[0002] With technological advancements, some applications are placing higher demands on the size of high-power inverters, making integrated inverters the trend. Integrated compressors combine the inverter, integrated compressor, and bearing system into a single unit, significantly improving space utilization. However, this high level of integration also presents numerous challenges, the most significant of which is heat dissipation. During operation of a magnetic levitation unit, the inverter's power switch module is constantly switching on and off at high frequencies, generating significant switching and conduction losses. This, in turn, increases the module's temperature. Furthermore, the high-speed operation of the integrated compressor also rapidly increases the motor winding temperature. High temperatures can easily cause module failure and motor damage.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The object of the present invention is to provide an integrated compressor heat dissipation control device, an integrated compressor and a heat dissipation control method thereof, so as to solve the problem that during the operation of the integrated compressor, the temperature of the inverter module and the temperature of the motor winding will both rise, and the high temperature will cause the inverter module to fail and the motor to be damaged, thereby affecting the stability and safety of the operation of the integrated compressor. By respectively setting a heat dissipation flow channel and a throttling device (such as an electronic expansion valve) for the inverter part and the motor part (that is, the motor and the bearing), and performing PI control on the opening of the corresponding throttling device according to the sampling temperature, the inverter temperature and the motor winding temperature are effectively reduced and the fluctuation is small, thereby improving the stability and safety of the operation of the integrated compressor.

[0005] The present invention provides a heat dissipation control device for an integrated compressor, wherein the integrated compressor has a motor part and a frequency converter part; a first heat dissipation channel is provided for the motor part, and a first throttling device is provided on the first heat dissipation channel, preferably a first throttling device is provided at the refrigerant inlet of the first heat dissipation channel; a second heat dissipation channel is provided for the frequency converter part, and a second throttling device is provided on the second heat dissipation channel, preferably a second throttling device is provided at the refrigerant inlet of the second heat dissipation channel; the heat dissipation control device for the integrated compressor comprises: a sampling unit and a control unit; wherein the control unit is used to control the opening of the first throttling device to a first set opening and control the second throttling device to a first set opening when the integrated compressor is started and running. The opening of the device is a second set opening; the sampling unit is used to sample the temperature of the motor part and the temperature of the inverter part; the control unit is also used to perform PI adjustment on the opening of the first throttling device according to the temperature of the motor part, so as to adjust the temperature of the motor part; and, according to the temperature of the inverter part, perform PI adjustment on the opening of the second throttling device to adjust the temperature of the inverter part, thereby realizing heat dissipation control of the integrated compressor; by respectively providing heat dissipation channels and throttling devices for the inverter part and the motor part, and performing PI control on the opening of the corresponding throttling device according to the sampled temperature, the temperature of the inverter part and the temperature of the motor part are effectively reduced and the fluctuation is small.

[0006] In some embodiments, the sampling unit includes: a first sampling module and a second sampling module; wherein the sampling unit samples the temperature of the motor part and samples the temperature of the inverter part, including: the first sampling module for sampling the motor winding temperature of the motor part as the temperature of the motor part; the second sampling module for sampling the temperature of the power switch module of the inverter part as the temperature of the inverter part.

[0007] In some embodiments, the control unit includes: a DSP main control chip and a drive control circuit; wherein the DSP main control chip outputs a drive control signal to the drive control circuit according to the temperature of the motor part, and the drive control circuit drives the first throttling device to operate, so as to perform PI adjustment on the opening of the first throttling device; and / or the DSP main control chip outputs a drive control signal to the drive control circuit according to the temperature of the inverter part, and the drive control circuit drives the second throttling device to operate, so as to perform PI adjustment on the opening of the second throttling device; wherein the first throttling device is set at the first heat dissipation flow The refrigerant inlet of the channel, the second throttling device is arranged at the refrigerant inlet of the second heat dissipation channel; and / or, the first throttling device and the second throttling device both adopt electronic expansion valves; the two coils of the electronic expansion valve have a first connection end, a second connection end, a third connection end and a fourth connection end, which are recorded as the first connection end, the second connection end, the third connection end and the fourth connection end of the electronic expansion valve; the drive control circuit adopts a drive chip; the first output end, the second output end, the third output end and the fourth output end of the drive chip are connected to the first connection end, the second connection end, the third connection end and the fourth connection end of the electronic expansion valve in a one-to-one correspondence.

[0008] In some embodiments, the motor part includes: a motor stator, a throttle hole, a rear radial bearing, a motor stator-rotor air gap, a front radial bearing and an air intake; the refrigerant flow direction of the first heat dissipation channel is: the first throttling device, the motor stator, the throttle hole, the rear radial bearing, the motor stator-rotor air gap, the front radial bearing, and the air intake; wherein, the first heat dissipation channel is designed in a first set shape to increase the contact area of ​​heat dissipation; and / or, the inverter part includes: an IGBT module, a thyristor module and an interstage; the refrigerant flow direction of the second heat dissipation channel is: the second throttling device, the IGBT module, the thyristor module, and the interstage; wherein, the first heat dissipation channel is designed in a second set shape to increase the contact area of ​​heat dissipation.

[0009] In some embodiments, the first heat dissipation channel and the second heat dissipation channel are both located inside the integrated compressor, and the first heat dissipation channel and the second heat dissipation channel both return air to the impeller of the integrated compressor inside the integrated compressor.

[0010] In some embodiments, the control unit performs PI adjustment on the opening of the first throttling device according to the temperature of the motor part to achieve regulation of the temperature of the motor part, including: determining whether the temperature of the motor part is greater than a first set reference temperature; if it is determined that the temperature of the motor part is greater than the first set reference temperature, then when the opening of the first throttling device has reached a preset minimum opening, maintaining the opening of the first throttling device at a preset minimum opening; when the opening of the first throttling device has not reached the preset minimum opening, using PI adjustment to control the opening of the first throttling device to decrease; thereby, achieving regulation of the temperature of the motor part; if it is determined that the temperature of the motor part is lower than the first set reference temperature, then when the opening of the first throttling device has reached a preset maximum opening, maintaining the opening of the first throttling device at a preset maximum opening; when the opening of the first throttling device has not reached the preset maximum opening, using PI adjustment to control the opening of the first throttling device to increase; thereby, achieving regulation of the temperature of the motor part.

[0011] In some embodiments, the control unit performs PI adjustment on the opening of the second throttling device according to the temperature of the inverter part to achieve temperature adjustment of the inverter part, including: determining whether the temperature of the inverter part is greater than a second set reference temperature; if it is determined that the temperature of the inverter part is greater than the second set reference temperature, then when the opening of the second throttling device has reached a preset minimum opening, maintaining the opening of the second throttling device at the preset minimum opening; if the opening of the second throttling device has not reached the preset minimum opening, using PI adjustment to control the opening of the second throttling device to decrease; thereby, achieving temperature adjustment of the inverter part; if it is determined that the temperature of the inverter part is less than the second set reference temperature, then when the opening of the second throttling device has reached a preset maximum opening, maintaining the opening of the second throttling device at the preset maximum opening; if the opening of the second throttling device has not reached the preset maximum opening, using PI adjustment to control the opening of the second throttling device to increase; thereby, achieving temperature adjustment of the inverter part.

[0012] Matching the above-mentioned device, the present invention further provides an integrated compressor, comprising: the heat dissipation control device of the integrated compressor described above.

[0013] Matching the above-mentioned integrated compressor, the present invention provides a heat dissipation control method for an integrated compressor on another aspect, comprising: when the integrated compressor is started and running, controlling the opening of the first throttling device to be a first set opening, and controlling the opening of the second throttling device to be a second set opening; sampling the temperature of the motor part, and sampling the temperature of the inverter part; performing PI adjustment on the opening of the first throttling device according to the temperature of the motor part to achieve adjustment of the temperature of the motor part; and performing PI adjustment on the opening of the second throttling device according to the temperature of the inverter part to achieve adjustment of the temperature of the inverter part, thereby achieving heat dissipation control of the integrated compressor; by respectively setting heat dissipation channels and throttling devices for the inverter part and the motor part, and performing PI control on the opening of the corresponding throttling device according to the sampled temperature, the temperature of the inverter part and the temperature of the motor part are effectively reduced and the fluctuation is small.

[0014] In some embodiments, according to the temperature of the motor part, PI regulation is performed on the opening of the first throttling device to achieve regulation of the temperature of the motor part, including: determining whether the temperature of the motor part is greater than a first set reference temperature; if it is determined that the temperature of the motor part is greater than the first set reference temperature, then when the opening of the first throttling device has reached a preset minimum opening, maintaining the opening of the first throttling device at a preset minimum opening; if the opening of the first throttling device has not reached the preset minimum opening, adopting a PI regulation method to control the opening of the first throttling device to decrease; thereby, regulation of the temperature of the motor part is achieved; if it is determined that the temperature of the motor part is less than the first set reference temperature, then when the opening of the first throttling device has reached a preset maximum opening, maintaining the opening of the first throttling device at a preset maximum opening; if the opening of the first throttling device has not reached the preset maximum opening, adopting a PI regulation method to control the opening of the first throttling device to increase; thereby, regulation of the temperature of the motor part is achieved; and / or, according to the temperature of the inverter part, PI adjustment is performed on the opening of the second throttling device to achieve the adjustment of the temperature of the inverter part, including: determining whether the temperature of the inverter part is greater than a second set reference temperature; if it is determined that the temperature of the inverter part is greater than the second set reference temperature, then when the opening of the second throttling device has reached a preset minimum opening, the opening of the second throttling device is maintained at the preset minimum opening; when the opening of the second throttling device has not reached the preset minimum opening, the opening of the second throttling device is controlled to decrease by PI adjustment; thereby, the adjustment of the temperature of the inverter part is achieved; if it is determined that the temperature of the inverter part is less than the second set reference temperature, then when the opening of the second throttling device has reached a preset maximum opening, the opening of the second throttling device is maintained at the preset maximum opening; when the opening of the second throttling device has not reached the preset maximum opening, the opening of the second throttling device is controlled to increase by PI adjustment; thereby, the adjustment of the temperature of the inverter part is achieved.

[0015] Therefore, the solution of the present invention is to dissipate heat of the inverter and the motor and bearings in the integrated compressor, and respectively set a heat dissipation flow path for the motor and bearings as a first heat dissipation flow path, and a heat dissipation flow path for the inverter as a second heat dissipation flow path; a first electronic expansion valve is set at the refrigerant inlet of the first heat dissipation flow path, and a second electronic expansion valve is set at the refrigerant inlet of the second heat dissipation flow path; during the operation of the integrated compressor after startup, the temperature of the power switch module in the inverter is obtained and recorded as the module temperature, and the motor winding temperature is obtained, and the opening of the first electronic expansion valve is PI controlled according to the motor winding temperature, and the opening of the second electronic expansion valve is PI controlled according to the module temperature to achieve heat dissipation control of the integrated compressor; thus, by respectively setting a heat dissipation flow path and a throttling device (such as an electronic expansion valve) for the inverter part and the motor part (i.e., the motor and bearing), and performing PI control on the opening of the corresponding throttling device according to the sampled temperature, the inverter temperature and the motor winding temperature are effectively reduced and the fluctuation is small, thereby improving the stability and safety of the operation of the integrated compressor.

[0016] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of an embodiment of a heat dissipation control device for an integrated compressor of the present invention;

[0019] Figure 2 The figure is a schematic diagram of the principle of a heat dissipation system applied to an integrated compressor;

[0020] Figure 3 This is a schematic diagram of the principle of a module temperature sampling circuit used in a heat dissipation system of an integrated compressor;

[0021] Figure 4 The schematic diagram is a principle diagram of a motor winding temperature sampling circuit used in a heat dissipation system of an integrated compressor;

[0022] Figure 5 The figure is a schematic diagram of a driving control circuit used in a heat dissipation system of an integrated compressor;

[0023] Figure 6 Schematic diagram of an internal coil of an electronic expansion valve and its control logic in a heat dissipation system for an integrated compressor, wherein (a) is a schematic diagram of the structure of the internal coil of the electronic expansion valve, and (b) is a schematic diagram of the control logic of the internal coil of the electronic expansion valve;

[0024] Figure 7 A flow chart of a control method for a heat dissipation system of an integrated compressor;

[0025] Figure 8 This is a schematic diagram of the flow channels of a heat dissipation system used in an integrated compressor, where the blue flow channels are for dissipating heat from the motor and bearings, and the green flow channels are for dissipating heat from the inverter module.

[0026] Figure 9 1 is a flow chart of an embodiment of a heat dissipation control method for an integrated compressor of the present invention;

[0027] Figure 10 1. A flow chart of an embodiment of performing PI regulation on the opening of the first throttling device in the method of the present invention;

[0028] Figure 11 This is a flow chart of an embodiment of performing PI regulation on the opening of the second throttling device in the method of the present invention.

[0029] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0030] 1-first electronic expansion valve; 2-second electronic expansion valve. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Considering that during the operation of an integrated compressor, the temperature of the inverter module and the motor windings will rise, high temperatures can easily cause module failure (i.e., the inverter's power switch module) and motor damage, thus affecting the stability and safety of the integrated compressor's operation. Therefore, to improve the safety and stability of the magnetic levitation unit's operation, the design of the heat dissipation system is particularly important.

[0033] The cooling system used in related solutions primarily utilizes an inlet refrigerant flow channel controlled by a single solenoid valve to dissipate heat for both the motor and the inverter power module. However, this cooling method presents several issues. For example, while controlled by a solenoid valve, a switching device that can only open and close, it cannot control the refrigerant flow in the channel. This results in significant temperature fluctuations during operation, seriously endangering the motor's service life. Furthermore, the frequent opening and closing of the solenoid valve poses a serious threat to its service life, reducing the unit's operational reliability. Furthermore, the use of a single solenoid valve to dissipate heat for both the motor and the inverter power module simultaneously can lead to condensation on one of them due to the inconsistent rise in temperature between the inverter module and the motor winding.

[0034] Therefore, the solution of the present invention proposes a heat dissipation control device for an integrated compressor, specifically a heat dissipation system and a control device thereof applied to an integrated compressor, which uses two refrigerant flow channels to dissipate heat for the inverter, motor and bearings respectively. The flow channels are inside the integrated compressor, and only a refrigerant air inlet pipeline needs to be arranged on the outside, and the air is returned from the inside to the integrated compressor impeller; two electronic expansion valves are used as valves for the two flow channels respectively, and the openings of the two electronic expansion valves are controlled separately through software PI adjustment (i.e. proportional-integral adjustment) to realize the refrigerant flow control of the flow channels, and the temperature of the inverter module and the motor winding temperature are controlled separately, so that the temperature of the inverter module and the motor winding temperature are effectively reduced and the fluctuation is small, thereby improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0035] According to an embodiment of the present invention, a heat dissipation control device for an integrated compressor is provided. Figure 1 The structure diagram of an embodiment of the device of the present invention is shown. The integrated compressor comprises a motor portion and an inverter portion, wherein the motor portion includes a motor and bearings, and the inverter portion includes a power switch module of the inverter. A first heat dissipation channel is provided for the motor portion (specifically, a first heat dissipation channel is provided for the portion of the motor portion that requires heat dissipation), and a first throttling device (such as a first electronic expansion valve 1) is provided on the first heat dissipation channel. A second heat dissipation channel is provided for the inverter portion (specifically, a first heat dissipation channel is provided for the portion of the inverter portion that requires heat dissipation), and a second throttling device (such as a second electronic expansion valve 2) is provided on the second heat dissipation channel. The heat dissipation control device of the integrated compressor comprises: a sampling unit and a control unit.

[0036] The control unit is configured to control the opening of the first throttling device to be a first set opening, and to control the opening of the second throttling device to be a second set opening when the integrated compressor is started and running.

[0037] The sampling unit is used to sample the temperature of the motor part and the temperature of the inverter part.

[0038] The control unit is further used to perform PI adjustment on the opening of the first throttling device according to the temperature of the motor part, so as to adjust the temperature of the motor part; and to perform PI adjustment on the opening of the second throttling device according to the temperature of the inverter part, so as to adjust the temperature of the inverter part, thereby realizing heat dissipation control of the integrated compressor; by respectively providing heat dissipation channels and throttling devices for the inverter part and the motor part, and performing PI control on the opening of the corresponding throttling device according to the sampling temperature, the temperature of the inverter part and the temperature of the motor part are effectively reduced and the fluctuation is small.

[0039] The solution of the present invention proposes a heat dissipation system and control scheme for an integrated compressor, which uses two refrigerant flow channels to dissipate heat for the inverter, motor, and bearings respectively, and uses electronic expansion valves as flow channel valves. Specifically, two electronic expansion valves are used as valves for the two flow channels respectively, and the openings of the two electronic expansion valves are controlled separately by software PI adjustment. The opening can be adjusted within the allowable range to accurately control the throttling device, thereby realizing refrigerant flow control in the flow channel, effectively reducing the inverter module temperature and the motor winding temperature and making the fluctuation smaller, reducing the risk of condensation water, and improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor). Therefore, not only the heat dissipation problem of the integrated compressor is solved, but also the problems of large temperature fluctuations and condensation water in the related solutions are solved.

[0040] In some embodiments, the sampling unit includes: a first sampling module and a second sampling module, the first sampling module is such as a PT100 sampling module, specifically such as a motor winding temperature sampling circuit; the second sampling module is such as an NTC sampling module, specifically such as a module temperature sampling circuit of a heat dissipation system; the second sampling module is arranged at the inverter part, and the first sampling module is arranged at the motor part.

[0041] The sampling unit samples the temperature of the motor part and the temperature of the inverter part, including:

[0042] The first sampling module is used to sample the motor winding temperature of the motor part as the temperature of the motor part.

[0043] The second sampling module is used to sample the temperature of the power switch module of the inverter part as the temperature of the inverter part.

[0044] Figure 3The figure is a schematic diagram of the principle of a module temperature sampling circuit used in a heat dissipation system of an integrated compressor. Figure 3 As shown, the module temperature sampling circuit of the heat dissipation system includes: NTC resistor RNTC, resistor R0, capacitor C1, and operational amplifier U1. Power supply VCC is connected to the non-inverting input of operational amplifier U1 after passing through NTC resistor RNTC. Resistor R0 and capacitor C1 are connected in parallel between the non-inverting input of operational amplifier U1 and ground. The inverting input of operational amplifier U1 is connected to the output of operational amplifier U1, which can output the temperature sampling value DSP_U_T_IGBT.

[0045] See also Figure 3 In the example shown, a voltage divider circuit consisting of power supply VCC, NTC resistor RNTC, and resistor R0 forms a follower circuit with operational amplifier U1. Capacitor C1 is a filter capacitor that filters out high-frequency interference from the power supply. Operational amplifier U1 outputs the temperature sampling value DSP_U_T_IGBT and inputs it into the DSP main control chip. The temperature sampling value DSP_U_T_IGBT output by operational amplifier U1 is:

[0046]

[0047] Wherein, VCC is the voltage value of the power supply VCC of the module temperature sampling circuit of the heat dissipation system, R0 is the resistance value of the resistor R0, and RNTC is the resistance value of the NTC resistor RNTC.

[0048] Figure 4 The figure is a schematic diagram of the principle of a motor winding temperature sampling circuit used in the heat dissipation system of an integrated compressor. Figure 4 As shown, the motor winding temperature sampling circuit of the heat dissipation system includes: resistors R1, R1, R1, R1, R1, R1, R1, R1, R1, R100, and PT100; capacitors C2 and C4; and an operational amplifier U2. The power supply +VCC is connected to ground via resistors R6 and PT100 connected in series. The power supply +VCC is also connected to ground via resistors R5 and P100 connected in series. The common terminal of resistors R5 and P100 is connected to the inverting input of operational amplifier U2 via resistor R3. The common terminal of resistors R6 and PT100 is connected to the non-inverting input of operational amplifier U2 via resistor R1. Resistor R4 and capacitor C4 are connected in parallel between the inverting input of operational amplifier U2 and the output of operational amplifier U2. Resistor R2 and capacitor C2 are connected in parallel between the non-inverting input of operational amplifier U2 and ground. The output of operational amplifier U2 outputs the motor winding temperature sampling value DSP_U_T_RZ.

[0049] See also Figure 4In the example shown, the front end of the heat dissipation system's motor winding temperature sampling circuit is a Wheatstone bridge consisting of power supply +VCC, resistors R5, R6, R100, and PT100. Resistor R100 has a resistance of 100Ω, and resistors R5 and R6 have equal resistances, i.e., R5 = R6. The back end of the heat dissipation system's motor winding temperature sampling circuit is an amplifier circuit consisting of operational amplifier U2, resistors R1, R2, R3, R4, and capacitors C2 and C4. Resistor R1 and R3 have equal resistances, i.e., R1 = R3, and resistors R2 and R4 have equal resistances, i.e., R2 = R4. The processed motor winding temperature sampling value DSP_U_T_RZ is:

[0050]

[0051] Among them, VCC is the voltage value of the power supply + VCC of the motor winding temperature sampling circuit of the heat dissipation system, R1 is the resistance value of the resistor R1, R2 is the resistance value of the resistor R2, R5 is the resistance value of the resistor R5, R6 is the resistance value of the resistor R6, PT100 is the resistance value of the resistor PT100, and R100 is the resistance value of the resistor R100.

[0052] The solution of the present invention samples the temperature of the inverter part through the second sampling module and samples the temperature of the motor part through the first sampling module, so as to realize separate sampling of the temperature of the inverter part and the temperature of the motor part, and then perform separate temperature control according to the separately sampled temperatures, thereby realizing precise heat dissipation control of the temperature of the inverter part and the temperature of the motor part, so that the temperature of the inverter module and the temperature of the motor winding are effectively reduced and the fluctuation is small, thereby reducing the risk of condensation water and improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0053] In some embodiments, the control unit includes: a DSP main control chip and a drive control circuit. The DSP main control chip outputs a drive control signal to the drive control circuit, and the drive control circuit drives the throttling device that needs to adjust the opening of the first throttling device and the second throttling device to operate. Specifically, the DSP main control chip outputs a drive control signal to the drive control circuit according to the temperature of the motor part, and the drive control circuit drives the first throttling device to operate to perform PI adjustment on the opening of the first throttling device; and / or, the DSP main control chip outputs a drive control signal to the drive control circuit according to the temperature of the inverter part, and the drive control circuit drives the second throttling device to operate to perform PI adjustment on the opening of the second throttling device.

[0054] Figure 2The figure is a schematic diagram of the principle of a heat dissipation system applied to an integrated compressor. Figure 2 As shown in the figure, the heat dissipation system for an integrated compressor includes a temperature sampling unit, a digital signal processing (DSP) main control unit, a drive control circuit, and an electronic expansion valve. The temperature sampling unit is mainly divided into a module temperature sampling unit and a motor winding temperature sampling unit. The output of the module temperature sampling unit and the output of the motor winding temperature sampling unit are respectively connected to the input of the DSP main control unit. The output of the DSP main control unit is connected to the control terminal of the electronic expansion valve through the drive control circuit.

[0055] In the module temperature sampling part, the internal negative temperature coefficient thermistor (NTC thermistor, NTC resistor) of the module (i.e., the power switch module of the inverter) is used to detect the internal temperature. The NTC resistor is connected to the module temperature sampling circuit of the main control board. The processed module temperature sampling value is directly input into the analog to digital converter (AD) sampling port of the DSP main control part.

[0056] In the motor winding temperature sampling section, a platinum resistance thermometer (PT100) is used to measure the motor winding temperature. The PT100 is connected to the motor winding temperature sampling circuit on the main control board. The processed motor winding temperature sample value is directly input into the AD sampling port of the DSP main control section. The DSP main control section includes a DSP main control chip. The DSP main control chip performs software processing on the received temperature sampling signal and outputs the electronic expansion valve control signal to the drive control circuit. The drive control circuit is connected to the electronic expansion valve, and the output drive control signal directly drives the electronic expansion valve.

[0057] Preferably, the first throttling device is arranged at the refrigerant inlet of the first heat dissipation channel, and the second throttling device is arranged at the refrigerant inlet of the second heat dissipation channel; and / or, the first throttling device and the second throttling device are both electronic expansion valves; the two coils of the electronic expansion valve have a first connection end, a second connection end, a third connection end and a fourth connection end, which are denoted as the first connection end, the second connection end, the third connection end and the fourth connection end of the electronic expansion valve, such as A (orange), B (black), The connection end of the coil.

[0058] The drive control circuit uses a driver chip, specifically a driver chip model DRV8860; the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal of the driver chip (such as the first output terminal OUT1, the second output terminal OUT2, the third output terminal OUT3, and the fourth output terminal OUT4) are connected in a one-to-one correspondence with the first connection terminal, the second connection terminal, the third connection terminal, and the fourth connection terminal of the electronic expansion valve. Specifically, the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal of the driver chip (such as the first output terminal OUT1, the second output terminal OUT2, the third output terminal OUT3, and the fourth output terminal OUT4) are connected in a one-to-one correspondence with the first connection terminal, the second connection terminal, the third connection terminal, and the fourth connection terminal of the first electronic expansion valve 1. The first output terminal, the second output terminal, the third output terminal, and the fourth output terminal of the driver chip (such as the first output terminal OUT1, the second output terminal OUT2, the third output terminal OUT3, and the fourth output terminal OUT4) are also connected in a one-to-one correspondence with the first connection terminal, the second connection terminal, the third connection terminal, and the fourth connection terminal of the second electronic expansion valve 2.

[0059] Figure 5 The schematic diagram of the driving control circuit of the cooling system used in the integrated compressor is shown in FIG. Figure 5 As shown, the DSP main control chip receives the sampling signal processed by the module temperature sampling circuit and the motor winding temperature sampling circuit, and outputs the drive control signal to the drive control circuit after software PI adjustment. Because the driving capability of the DSP main control chip is insufficient and cannot directly drive the electronic expansion valve, the driver chip DRV8860 is used to improve the driving capability. The input end of the driver chip DRV8860 is controlled by the DSP main control chip, where VCC is the power supply pin, DIN is the input signal pin, CLK is the clock signal pin, ENABLE is the enable signal pin, and LATCH is the serial latch signal pin. The driver chip DRV8860 can output four channels (such as the first channel OUT1, the second channel OUT2, the third channel OUT3, and the fourth channel OUT4) with a current value of up to 330mA of the drive control signal to drive the electronic expansion valve. Among them, the first channel OUT1, the second channel OUT2, the third channel OUT3, and the fourth channel OUT4 are connected to the A (orange), B (black), The connection end of the coil.

[0060] Figure 6 The figure is a schematic diagram of the internal coil of an electronic expansion valve and its control logic used in a heat dissipation system of an integrated compressor, wherein (a) is a structural schematic diagram of the internal coil of the electronic expansion valve, and (b) is a control logic schematic diagram of the internal coil of the electronic expansion valve. Figure 6As shown in (a), the internal coil of the electronic expansion valve is mainly composed of two coils. The midpoints of the two coils are drawn out as a common line, and two control lines are drawn out from both ends of the two coils, namely A (orange) and B (black), The opening process of the electronic expansion valve is the excitation process of the internal coil. The valve opening process needs to go through the following steps: Figure 6 The eight-step basic control logic shown in (b) is repeated repeatedly. Different valve openings correspond to different valve opening steps; a greater number of valve opening steps indicates a greater opening. For example, using the electronic expansion valve used in the present invention, 480 steps correspond to maximum opening, while 43 steps correspond to minimum opening.

[0061] in, Figure 6 In the middle (b) figure, the shaded area is high level, and the control logic sequence for opening the valve is as follows:

[0062] (1) Phase A is high level, and the others are low level.

[0063] (2) Phase A and Phase B are high level, and the others are low level.

[0064] (3) Phase B is high level, and the others are low level.

[0065] (4) Phase B, The phase is high level, and the others are low level.

[0066] (5) The phase is high level, and the others are low level.

[0067] (6) Mutually, The phase is high level, and the others are low level.

[0068] (7) The phase is high level, and the others are low level.

[0069] (8) Phase A, The phase is high level, and the others are low level.

[0070] For example, if the software sets the valve opening step number to 18, the above sequence will be repeated twice, and finally stop at the above situation (2), completing the valve opening action of the corresponding opening. The more steps, the larger the corresponding opening.

[0071] In the solution of the present invention, a DSP main control chip and a drive control circuit are provided to constitute the control unit. The DSP main control chip is used to generate a drive control signal according to the inverter module temperature and the motor winding temperature. The drive control signal is used to reliably drive the electronic expansion valve to operate through the drive chip, so that the opening of the two electronic expansion valves can be controlled separately through software PI adjustment according to the temperature sampling value. The opening can be adjusted within the allowable range to accurately control the throttling device, thereby realizing the refrigerant flow control of the flow channel, so that the inverter module temperature and the motor winding temperature are effectively reduced and the fluctuation is small, thereby improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0072] In this way, two electronic expansion valves are used as valves for the two flow channels respectively, and the temperatures of the inverter module and the motor winding are measured. The openings of the two electronic expansion valves are controlled separately through software PI adjustment according to the temperature sampling values, thereby realizing the refrigerant flow control of the flow channel. In the solution of the present invention, electronic expansion valves are used instead of solenoid valves as flow channel valves. The opening can be adjusted within the allowable range to accurately control the throttling device, thereby realizing the refrigerant flow control of the flow channel, effectively reducing the temperature of the inverter module and the temperature of the motor winding and reducing the fluctuation, thereby improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0073] In some embodiments, the motor part includes: a motor stator, a throttle hole, a rear radial bearing, a motor stator-rotor air gap, a front radial bearing and an air intake; specifically, the part of the motor part that needs to dissipate heat includes the motor stator, a throttle hole, a rear radial bearing, a motor stator-rotor air gap, a front radial bearing and an air intake; the refrigerant flow direction of the first heat dissipation channel is: the first throttling device, the motor stator, the throttle hole, the rear radial bearing, the motor stator-rotor air gap, the front radial bearing, and the air intake; wherein, the first heat dissipation channel is designed in a first set shape to increase the contact area of ​​heat dissipation, and the first set shape is such as a ring.

[0074] And / or, the inverter portion includes: an IGBT module, a thyristor module, and an interstage; specifically, the portion of the inverter portion requiring heat dissipation includes the IGBT module, the thyristor module, and the interstage; the refrigerant in the second heat dissipation channel flows in the following order: the second throttling device, the IGBT module, the thyristor module, and the interstage; wherein the first heat dissipation channel is designed in a second predetermined shape to increase the contact area for heat dissipation, and the second predetermined shape is serpentine. Preferably, the channel for the motor and bearing is designed to surround the electrodes and bearings, while the channel for the inverter is designed in a flat serpentine shape.

[0075] Figure 8This is a schematic diagram of the flow channels of a heat dissipation system for an integrated compressor, where the blue channels are for heat dissipation of the motor and bearings, and the green channels are for heat dissipation of the inverter module. Figure 8 As shown in the figure, the heat dissipation system is designed with two flow paths, one for the inverter module (i.e., the power switch module of the inverter) and the other for the motor and bearings. Two electronic expansion valves (i.e., the first electronic expansion valve 1 and the second electronic expansion valve 2) are placed at the refrigerant inlet, and the opening of the two electronic expansion valves is controlled by software PI adjustment. Figure 8 The refrigerant inlet marked in . Using a single refrigerant flow channel to cool both the motor and bearings greatly improves space utilization. The refrigerant flow direction of the motor and bearing heat dissipation flow channel is the first electronic expansion valve 1 → motor stator → rear radial bearing → motor stator-rotor air gap → front radial bearing → intake port. The motor bearing return air channel is connected to the compressor intake port, from which the refrigerant is recovered. The refrigerant flow direction of the inverter module cooling flow channel is the second electronic expansion valve 2 → insulated-gate bipolar transistor (IGBT) module → thyristor module → interstage, which simultaneously dissipates heat for the IGBT module and diode. The flow channel has a serpentine design, which increases the heat dissipation contact area and further improves the heat dissipation effect. Among them, the interstage refers to the part of the flow channel that does not require heat dissipation, such as the compressor intake port. The inverter return air channel is connected to the compressor intake port, from which the refrigerant is recovered.

[0076] In the related solutions, the solution for heat dissipation of the motor and bearings is to use different cooling channels for the motor and front and rear bearings, that is, one cooling channel inlet branches out into three channels for heat dissipation of the front bearing, motor, and rear bearing respectively; however, this solution is applied to integrated compressors, which have a relatively small internal space, so there are very high requirements for space utilization, and this solution is no longer applicable. Therefore, according to the solution of the present invention, two refrigerant channels are used to dissipate heat for the inverter and motor and bearings respectively, so that the temperature of the inverter module and the temperature of the motor winding are effectively reduced and the fluctuation is small, reducing the risk of condensation water, and improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor); and, for the heat dissipation channel of the motor part, one refrigerant channel is used to cool the motor and the front and rear bearings at the same time, thereby improving space utilization.

[0077] In some embodiments, the first heat dissipation channel and the second heat dissipation channel are both located inside the integrated compressor, and the first heat dissipation channel and the second heat dissipation channel both return air to the impeller of the integrated compressor (i.e., the intake port of the integrated compressor) inside the integrated compressor.

[0078] In the solution of the present invention, two refrigerant flow channels are used to dissipate heat for the inverter, motor and bearings respectively. The flow channels are inside the integrated compressor, and only a refrigerant intake pipe needs to be arranged on the outside. The air is returned from the inside to the integrated compressor impeller. This not only reduces the risk of condensed water, but also improves space utilization. In this way, two heat dissipation cooling flow channels are used to dissipate heat for the inverter, motor and bearings respectively. At the same time, an electronic expansion valve is used as a flow channel valve at the refrigerant inlet position of each heat dissipation flow channel. The inverter module and motor winding temperatures are collected respectively through the hardware temperature sampling circuit of the main control board. The openings of the two electronic expansion valves are controlled respectively through software PI adjustment according to the temperature sampling values ​​to realize the refrigerant flow control of the flow channel, and the temperature of the inverter module and the motor winding temperature are controlled separately, so that the inverter module temperature and the motor winding temperature are effectively reduced and the fluctuation is small, which is conducive to improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0079] In some embodiments, the control unit performs PI regulation on the opening of the first throttling device according to the temperature of the motor part to adjust the temperature of the motor part, including:

[0080] The control unit is further configured to determine whether the temperature of the motor part is greater than a first set reference temperature.

[0081] The control unit is specifically further used to, if it is determined that the temperature of the motor part is greater than a first set reference temperature, maintain the opening of the first throttling device at the preset minimum opening when the opening of the first throttling device has reached a preset minimum opening, and then return to re-determine whether the temperature of the motor part is greater than the first set reference temperature; if the opening of the first throttling device has not reached the preset minimum opening, use PI adjustment to control the opening of the first throttling device to decrease, and then return to re-determine whether the temperature of the motor part is greater than the first set reference temperature; in this way, the temperature of the motor part is regulated.

[0082] The control unit is further specifically used to, if it is determined that the temperature of the motor part is lower than a first set reference temperature, maintain the opening of the first throttling device at the preset maximum opening when the opening of the first throttling device has reached a preset maximum opening, and then return to redetermine whether the temperature of the motor part is higher than the first set reference temperature; when the opening of the first throttling device has not reached the preset maximum opening, control the opening of the first throttling device to increase by PI adjustment, and then return to redetermine whether the temperature of the motor part is higher than the first set reference temperature; thereby, the temperature of the motor part is regulated; by respectively providing a heat dissipation channel and a throttling device for the inverter part and the motor part, and performing PI control on the opening of the corresponding throttling device according to the sampling temperature, the temperature of the inverter part and the temperature of the motor part are effectively reduced and the fluctuation is small.

[0083] In the solution of the present invention, with respect to the temperature of the motor part, that is, the motor winding temperature, the opening of the first throttling device is PI-adjusted according to the temperature of the motor part, so as to adjust the temperature of the motor part, realize the refrigerant flow control of the flow channel, and independently control the motor winding temperature, so that the motor winding temperature is effectively reduced and the fluctuation is small, which is beneficial to improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0084] In some embodiments, the control unit performs PI adjustment on the opening of the second throttling device according to the temperature of the inverter part to adjust the temperature of the inverter part, including:

[0085] The control unit is further configured to determine whether the temperature of the inverter part is greater than a second set reference temperature.

[0086] The control unit is specifically further used to, if it is determined that the temperature of the inverter part is greater than the second set reference temperature, maintain the opening of the second throttling device at the preset minimum opening when the opening of the second throttling device has reached the preset minimum opening, and then return to re-determine whether the temperature of the inverter part is greater than the second set reference temperature; when the opening of the second throttling device has not reached the preset minimum opening, use PI adjustment to control the opening of the second throttling device to decrease, and then return to re-determine whether the temperature of the inverter part is greater than the second set reference temperature; in this way, the temperature of the inverter part is regulated.

[0087] The control unit is specifically further used to, if it is determined that the temperature of the inverter part is less than the second set reference temperature, maintain the opening of the second throttling device at the preset maximum opening when the opening of the second throttling device has reached the preset maximum opening, and then return to re-determine whether the temperature of the inverter part is greater than the second set reference temperature; when the opening of the second throttling device has not reached the preset maximum opening, use PI adjustment to control the opening of the second throttling device to increase, and then return to re-determine whether the temperature of the inverter part is greater than the second set reference temperature; in this way, the temperature of the inverter part is regulated.

[0088] Figure 7 FIG. 1 is a flow chart of a control method for a heat dissipation system of an integrated compressor. Figure 7 As shown, taking the heat dissipation of the inverter module as an example (the heat dissipation of the motor and bearing is the same), the control method applied to the heat dissipation system of the integrated compressor includes:

[0089] Step 1: When the inverter is started, the main control board is powered on, and the software pre-sets the opening of the electronic expansion valve according to the operating power of the inverter, and then executes step 2.

[0090] Step 2: The module temperature sampling circuit starts working and detects the temperature value in real time, and then executes step 3.

[0091] Step 3: The DSP master receives the real-time temperature value and performs PI adjustment, specifically to determine whether the module real-time temperature > reference temperature (such as the reference temperature is 35°): if so, execute step 4; otherwise, execute step 5.

[0092] Step 4: If the module real-time temperature > reference temperature, and if the opening of the electronic expansion valve has not yet reached the maximum opening, increase the opening of the electronic expansion valve. The specific opening of the electronic expansion valve is controlled by software PI regulation; otherwise, maintain the maximum opening of the electronic expansion valve.

[0093] Step 5: If the module's real-time temperature is less than the reference temperature, and the electronic expansion valve's opening has not yet reached its minimum opening, the valve's opening is reduced. The specific opening is controlled by software PI regulation. Otherwise, the valve's minimum opening is maintained. If the module's real-time temperature is equal to the reference temperature, the valve's opening remains unchanged.

[0094] Specifically, PI regulation control can be achieved by adjusting the control variable based on the difference between the feedback signal and the set point. In the solution of the present invention, the module's real-time temperature is the feedback signal, the reference temperature is the set point, and the control variable is the opening of the electronic expansion valve. If the module's real-time temperature is greater than the reference temperature, the electronic expansion valve is opened wider to lower the module's real-time temperature. If the module's real-time temperature is less than the reference temperature, the electronic expansion valve is opened narrower to raise the module's real-time temperature.

[0095] In this way, after the inverter is started, the real-time sampling module temperature and the electronic expansion valve control opening are Figure 7 The flow chart shown forms a feedback process to keep the temperature stable.

[0096] In the solution of the present invention, with respect to the temperature of the inverter part, that is, the inverter module temperature, the opening of the second throttling device is PI-adjusted according to the temperature of the inverter part to achieve the adjustment of the temperature of the inverter part, realize the refrigerant flow control of the flow channel, and control the temperature of the inverter part separately, so that the temperature of the inverter part is effectively reduced and the fluctuation is small, which is beneficial to improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0097] In the solution of the present invention, two flow channels are used to dissipate heat for the inverter module (i.e., the power switch module of the inverter), the motor, and the bearings, specifically, two refrigerant flow channels are used to dissipate heat for the inverter, the motor, and the bearings, respectively. The flow channels are inside the integrated compressor, and only the refrigerant inlet pipe needs to be arranged outside, and the air is returned from the inside to the integrated compressor impeller. This not only reduces the risk of condensation water, but also improves space utilization. At the same time, an electronic expansion valve is used instead of a solenoid valve, specifically, two electronic expansion valves are used as valves for the two flow channels. Furthermore, the temperature of the inverter module and the motor winding is collected by the hardware temperature sampling circuit of the main control board, and the opening of the two electronic expansion valves is controlled by software PI adjustment according to the temperature sampling value, thereby realizing the refrigerant flow control of the flow channel. Specifically, the opening of the two electronic expansion valves is controlled by software PI adjustment, thereby realizing the refrigerant flow control of the flow channel, and the temperature of the inverter module and the motor winding are controlled separately, so that the temperature of the inverter module and the motor winding are effectively reduced and the fluctuation is small, thereby improving the safety and stability of the operation of the magnetic levitation unit (specifically, the integrated compressor).

[0098] According to the technical solution of the present invention, a heat dissipation channel for the motor and bearings is set as a first heat dissipation channel, and a heat dissipation channel for the inverter is set as a second heat dissipation channel for the integrated compressor; a first electronic expansion valve is set at the refrigerant inlet of the first heat dissipation channel, and a second electronic expansion valve is set at the refrigerant inlet of the second heat dissipation channel; during the operation of the integrated compressor after startup, the temperature of the power switch module in the inverter is obtained and recorded as the module temperature, and the motor winding temperature is obtained, and the opening of the first electronic expansion valve is PI controlled according to the motor winding temperature, and the opening of the second electronic expansion valve is PI controlled according to the module temperature, so as to realize heat dissipation control of the integrated compressor; thus, by setting a heat dissipation channel and a throttling device (such as an electronic expansion valve) for the inverter part and the motor part (i.e., the motor and bearing), respectively, and performing PI control on the opening of the corresponding throttling device according to the sampled temperature, the inverter temperature and the motor winding temperature are effectively reduced and the fluctuation is small, thereby improving the stability and safety of the operation of the integrated compressor.

[0099] According to an embodiment of the present invention, an integrated compressor corresponding to the heat dissipation control device of the integrated compressor is further provided. The integrated compressor may include: the heat dissipation control device of the integrated compressor described above.

[0100] Since the processing and functions implemented by the integrated compressor of this embodiment basically correspond to the embodiments, principles and examples of the device, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0101] According to an embodiment of the present invention, a heat dissipation control method for an integrated compressor corresponding to the integrated compressor is also provided. Figure 9 FIG2 is a flow chart of an embodiment of the method of the present invention. The heat dissipation control method of the integrated compressor may include: steps S110 to S130.

[0102] In step S110 , when the integrated compressor is started and running, the opening degree of the first throttling device is controlled to be a first set opening degree, and the opening degree of the second throttling device is controlled to be a second set opening degree.

[0103] In step S120 , the temperature of the motor part is sampled, and the temperature of the inverter part is sampled.

[0104] At step S130, the opening of the first throttling device is PI-adjusted according to the temperature of the motor part to achieve regulation of the temperature of the motor part; and the opening of the second throttling device is PI-adjusted according to the temperature of the inverter part to achieve regulation of the temperature of the inverter part, thereby achieving heat dissipation control of the integrated compressor.

[0105] The solution of the present invention uses two refrigerant flow channels to dissipate heat for the inverter, motor, and bearings respectively, and uses electronic expansion valves as flow channel valves. Specifically, two electronic expansion valves are used as valves for the two flow channels respectively, and the openings of the two electronic expansion valves are controlled separately through software PI adjustment. The opening can be adjusted within the allowable range to accurately control the throttling device, thereby achieving refrigerant flow control in the flow channel, effectively reducing the inverter module temperature and the motor winding temperature with smaller fluctuations, reducing the risk of condensation, and improving the safety and stability of the operation of the magnetic levitation unit (specifically, the integrated compressor). Therefore, not only the heat dissipation problem of the integrated compressor is solved, but also the problems of large temperature fluctuations and condensation in related solutions are solved.

[0106] In some embodiments, in step S130, PI adjustment is performed on the opening of the first throttling device according to the temperature of the motor part to achieve a specific process of adjusting the temperature of the motor part. Please refer to the following exemplary description.

[0107] The following combination Figure 10 The flowchart of an embodiment of performing PI adjustment on the opening of the first throttling device in the method of the present invention further illustrates the specific process of performing PI adjustment on the opening of the first throttling device in step S130, including: steps S210 to S230.

[0108] Step S210 , determining whether the temperature of the motor part is greater than a first set reference temperature.

[0109] Step S220: If it is determined that the temperature of the motor part is greater than the first set reference temperature, then when the opening of the first throttling device has reached the preset minimum opening, the opening of the first throttling device is maintained at the preset minimum opening, and then the process returns to redetermine whether the temperature of the motor part is greater than the first set reference temperature; when the opening of the first throttling device has not reached the preset minimum opening, the opening of the first throttling device is controlled to decrease by PI adjustment, and then the process returns to redetermine whether the temperature of the motor part is greater than the first set reference temperature; thereby, the temperature of the motor part is regulated.

[0110] Step S230: If it is determined that the temperature of the motor part is lower than the first set reference temperature, then when the opening of the first throttling device has reached the preset maximum opening, the opening of the first throttling device is maintained at the preset maximum opening, and then the process returns to redetermine whether the temperature of the motor part is higher than the first set reference temperature; when the opening of the first throttling device has not reached the preset maximum opening, the opening of the first throttling device is controlled to increase by PI regulation, and then the process returns to redetermine whether the temperature of the motor part is higher than the first set reference temperature; thereby, the temperature of the motor part is regulated.

[0111] In the solution of the present invention, with respect to the temperature of the motor part, that is, the motor winding temperature, the opening of the first throttling device is PI-adjusted according to the temperature of the motor part, so as to adjust the temperature of the motor part, realize the refrigerant flow control of the flow channel, and independently control the motor winding temperature, so that the motor winding temperature is effectively reduced and the fluctuation is small, which is beneficial to improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0112] In some embodiments, in step S130, the opening of the second throttling device is PI-adjusted according to the temperature of the inverter part to achieve the specific process of adjusting the temperature of the inverter part. Please refer to the following exemplary description.

[0113] The following combination Figure 11 The flowchart of an embodiment of performing PI adjustment on the opening of the second throttling device in the method of the present invention further illustrates the specific process of performing PI adjustment on the opening of the second throttling device in step S130, including: steps S310 to S330.

[0114] Step S310: Determine whether the temperature of the inverter part is greater than a second set reference temperature.

[0115] Step S320: If it is determined that the temperature of the inverter part is greater than the second set reference temperature, then when the opening of the second throttling device has reached the preset minimum opening, the opening of the second throttling device is maintained at the preset minimum opening, and then returns to re-determine whether the temperature of the inverter part is greater than the second set reference temperature; when the opening of the second throttling device has not reached the preset minimum opening, the opening of the second throttling device is controlled to decrease by PI adjustment, and then returns to re-determine whether the temperature of the inverter part is greater than the second set reference temperature; in this way, the temperature of the inverter part is adjusted.

[0116] Step S330: If it is determined that the temperature of the inverter part is lower than the second set reference temperature, then when the opening of the second throttling device has reached the preset maximum opening, the opening of the second throttling device is maintained at the preset maximum opening, and then the process returns to redetermine whether the temperature of the inverter part is higher than the second set reference temperature; when the opening of the second throttling device has not reached the preset maximum opening, the opening of the second throttling device is controlled to increase by PI adjustment, and then the process returns to redetermine whether the temperature of the inverter part is higher than the second set reference temperature; thereby, the temperature of the inverter part is adjusted.

[0117] Figure 7 FIG. 1 is a flow chart of a control method for a heat dissipation system of an integrated compressor. Figure 7 As shown, taking the heat dissipation of the inverter module as an example (the heat dissipation of the motor and bearing is the same), the control method applied to the heat dissipation system of the integrated compressor includes:

[0118] Step 1: When the inverter is started, the main control board is powered on, and the software pre-sets the opening of the electronic expansion valve according to the operating power of the inverter, and then executes step 2.

[0119] Step 2: The module temperature sampling circuit starts working and detects the temperature value in real time, and then executes step 3.

[0120] Step 3: The DSP master receives the real-time temperature value and performs PI adjustment, specifically to determine whether the module real-time temperature > reference temperature (such as the reference temperature is 35°): if so, execute step 4; otherwise, execute step 5.

[0121] Step 4: If the module real-time temperature > reference temperature, and if the opening of the electronic expansion valve has not yet reached the maximum opening, increase the opening of the electronic expansion valve. The specific opening of the electronic expansion valve is controlled by software PI regulation; otherwise, maintain the maximum opening of the electronic expansion valve.

[0122] Step 5: If the module's real-time temperature is less than the reference temperature, and the electronic expansion valve's opening has not yet reached its minimum opening, the valve's opening is reduced. The specific opening is controlled by software PI regulation. Otherwise, the valve's minimum opening is maintained. If the module's real-time temperature is equal to the reference temperature, the valve's opening remains unchanged.

[0123] In this way, after the inverter is started, the real-time sampling module temperature and the electronic expansion valve control opening are Figure 7 The flow chart shown forms a feedback process to keep the temperature stable.

[0124] In the solution of the present invention, with respect to the temperature of the inverter part, that is, the inverter module temperature, the opening of the second throttling device is PI-adjusted according to the temperature of the inverter part to achieve the adjustment of the temperature of the inverter part, realize the refrigerant flow control of the flow channel, and control the temperature of the inverter part separately, so that the temperature of the inverter part is effectively reduced and the fluctuation is small, which is beneficial to improving the safety and stability of the operation of the magnetic levitation unit (specifically the integrated compressor).

[0125] In the solution of the present invention, two flow channels are used to dissipate heat for the inverter module (i.e., the power switch module of the inverter), the motor, and the bearings, specifically, two refrigerant flow channels are used to dissipate heat for the inverter, the motor, and the bearings, respectively. The flow channels are inside the integrated compressor, and only the refrigerant inlet pipe needs to be arranged outside, and the air is returned from the inside to the integrated compressor impeller. This not only reduces the risk of condensation water, but also improves space utilization. At the same time, an electronic expansion valve is used instead of a solenoid valve, specifically, two electronic expansion valves are used as valves for the two flow channels. Furthermore, the temperature of the inverter module and the motor winding is collected by the hardware temperature sampling circuit of the main control board, and the opening of the two electronic expansion valves is controlled by software PI adjustment according to the temperature sampling value, thereby realizing the refrigerant flow control of the flow channel. Specifically, the opening of the two electronic expansion valves is controlled by software PI adjustment, thereby realizing the refrigerant flow control of the flow channel, and the temperature of the inverter module and the motor winding are controlled separately, so that the temperature of the inverter module and the motor winding are effectively reduced and the fluctuation is small, thereby improving the safety and stability of the operation of the magnetic levitation unit (specifically, the integrated compressor).

[0126] Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned integrated compressor, for any details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0127] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0128] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A heat dissipation control device for an integrated compressor, characterized in that: The integrated compressor comprises a motor part and a frequency converter part; a first heat dissipation channel is provided for the motor part, and a first throttling device is provided on the first heat dissipation channel; A second heat dissipation channel is provided for the inverter part, and a second throttling device is provided on the second heat dissipation channel; the heat dissipation control device of the integrated compressor includes: a sampling unit and a control unit; wherein, The control unit is used to control the opening of the first throttling device to be a first set opening, and control the opening of the second throttling device to be a second set opening when the integrated compressor is started and running; The sampling unit is used to sample the temperature of the motor part and the temperature of the inverter part; The control unit is also used to perform PI adjustment on the opening of the first throttling device according to the temperature of the motor part, so as to adjust the temperature of the motor part; and to perform PI adjustment on the opening of the second throttling device according to the temperature of the inverter part, so as to adjust the temperature of the inverter part, thereby realizing heat dissipation control of the integrated compressor; by respectively providing heat dissipation channels and throttling devices for the inverter part and the motor part, and performing PI control on the opening of the corresponding throttling device according to the sampled temperature, the temperature of the inverter part and the temperature of the motor part are effectively reduced and the fluctuation is small.

2. The heat dissipation control device of the integrated compressor according to claim 1, characterized in that: The sampling unit comprises: a first sampling module and a second sampling module; The sampling unit samples the temperature of the motor part and the temperature of the inverter part, including: The first sampling module is used to sample the motor winding temperature of the motor part as the temperature of the motor part; The second sampling module is used to sample the temperature of the power switch module of the inverter part as the temperature of the inverter part.

3. The heat dissipation control device of the integrated compressor according to claim 1, characterized in that: The control unit includes: a DSP main control chip and a drive control circuit; wherein, The DSP main control chip outputs a driving control signal to the driving control circuit according to the temperature of the motor part, and the driving control circuit drives the first throttling device to operate so as to perform PI adjustment on the opening of the first throttling device; and / or, the DSP main control chip outputs a driving control signal to the driving control circuit according to the temperature of the inverter part, and the driving control circuit drives the second throttling device to operate so as to perform PI adjustment on the opening of the second throttling device; Wherein, the first throttling device is arranged at the refrigerant air inlet of the first heat dissipation channel, and the second throttling device is arranged at the refrigerant air inlet of the second heat dissipation channel; and / or, the first throttling device and the second throttling device are both electronic expansion valves; the two coils of the electronic expansion valve have a first connection end, a second connection end, a third connection end and a fourth connection end, which are recorded as the first connection end, the second connection end, the third connection end and the fourth connection end of the electronic expansion valve; The drive control circuit adopts a drive chip; the first output terminal, the second output terminal, the third output terminal and the fourth output terminal of the drive chip are connected to the first connection terminal, the second connection terminal, the third connection terminal and the fourth connection terminal of the electronic expansion valve in a one-to-one correspondence.

4. The heat dissipation control device of the integrated compressor according to claim 1, characterized in that: in, The motor part includes: a motor stator, a throttle hole, a rear radial bearing, a motor stator-rotor air gap, a front radial bearing and an air intake port; the refrigerant flow direction of the first heat dissipation channel is: the first throttle device, the motor stator, the throttle hole, the rear radial bearing, the motor stator-rotor air gap, the front radial bearing, and the air intake port; wherein the first heat dissipation channel is designed in a first set shape to increase the contact area of ​​heat dissipation; and / or, The inverter part includes: an IGBT module, a thyristor module and an interstage; the refrigerant flow direction of the second heat dissipation channel is: the second throttling device, the IGBT module, the thyristor module, and the interstage; wherein, the first heat dissipation channel is designed in a second set shape to increase the contact area of ​​heat dissipation.

5. The heat dissipation control device of the integrated compressor according to claim 1, characterized in that: The first heat dissipation flow channel and the second heat dissipation flow channel are both located inside the integrated compressor, and the first heat dissipation flow channel and the second heat dissipation flow channel both return air to the impeller of the integrated compressor inside the integrated compressor.

6. The heat dissipation control device for an integrated compressor according to claim 1, characterized in that: The control unit performs PI adjustment on the opening of the first throttling device according to the temperature of the motor part to adjust the temperature of the motor part, including: determining whether the temperature of the motor portion is greater than a first set reference temperature; If it is determined that the temperature of the motor part is greater than the first set reference temperature, then when the opening of the first throttling device has reached a preset minimum opening, the opening of the first throttling device is maintained at the preset minimum opening; when the opening of the first throttling device has not reached the preset minimum opening, the opening of the first throttling device is controlled to decrease in a PI adjustment manner; thereby, the temperature of the motor part is adjusted; If it is determined that the temperature of the motor part is lower than the first set reference temperature, then when the opening of the first throttling device has reached the preset maximum opening, the opening of the first throttling device is maintained at the preset maximum opening; when the opening of the first throttling device has not reached the preset maximum opening, the opening of the first throttling device is controlled to increase by PI adjustment; thereby, the temperature of the motor part is regulated.

7. The heat dissipation control device for an integrated compressor according to any one of claims 1 to 6, characterized in that: The control unit performs PI adjustment on the opening of the second throttling device according to the temperature of the inverter part to adjust the temperature of the inverter part, including: determining whether the temperature of the inverter part is greater than a second set reference temperature; If it is determined that the temperature of the inverter part is greater than the second set reference temperature, then when the opening of the second throttling device has reached a preset minimum opening, the opening of the second throttling device is maintained at the preset minimum opening; when the opening of the second throttling device has not reached the preset minimum opening, the opening of the second throttling device is controlled to decrease in a PI adjustment manner; thereby, the temperature of the inverter part is adjusted; If it is determined that the temperature of the inverter part is lower than the second set reference temperature, then when the opening of the second throttling device has reached the preset maximum opening, the opening of the second throttling device is maintained at the preset maximum opening; when the opening of the second throttling device has not reached the preset maximum opening, the opening of the second throttling device is controlled to increase by PI adjustment; thereby, the temperature of the inverter part is adjusted.

8. An integrated compressor, characterized in that: include: The heat dissipation control device for an integrated compressor as claimed in any one of claims 1 to 7.

9. A heat dissipation control method for an integrated compressor as claimed in claim 8, characterized in that: include: When the integrated compressor is started and then runs, controlling the opening of the first throttling device to be a first set opening, and controlling the opening of the second throttling device to be a second set opening; Sampling the temperature of the motor part and sampling the temperature of the inverter part; According to the temperature of the motor part, PI adjustment is performed on the opening of the first throttling device to adjust the temperature of the motor part; Furthermore, according to the temperature of the inverter part, the opening of the second throttling device is PI-adjusted to achieve the adjustment of the temperature of the inverter part, thereby realizing the heat dissipation control of the integrated compressor; by respectively providing heat dissipation channels and throttling devices for the inverter part and the motor part, and performing PI control on the opening of the corresponding throttling device according to the sampled temperature, the temperature of the inverter part and the temperature of the motor part are effectively reduced and the fluctuation is small.

10. The heat dissipation control method of the integrated compressor according to claim 9, characterized in that: in, According to the temperature of the motor part, the opening of the first throttling device is PI-adjusted to achieve the adjustment of the temperature of the motor part, including: determining whether the temperature of the motor portion is greater than a first set reference temperature; If it is determined that the temperature of the motor part is greater than the first set reference temperature, then when the opening of the first throttling device has reached a preset minimum opening, the opening of the first throttling device is maintained at the preset minimum opening; when the opening of the first throttling device has not reached the preset minimum opening, the opening of the first throttling device is controlled to decrease in a PI adjustment manner; thereby, the temperature of the motor part is adjusted; If it is determined that the temperature of the motor part is lower than the first set reference temperature, then when the opening of the first throttling device has reached a preset maximum opening, the opening of the first throttling device is maintained at the preset maximum opening; when the opening of the first throttling device has not reached the preset maximum opening, the opening of the first throttling device is controlled to increase by a PI adjustment method; thereby, the temperature of the motor part is adjusted; and / or, According to the temperature of the inverter part, the opening of the second throttling device is PI-adjusted to achieve the adjustment of the temperature of the inverter part, including: determining whether the temperature of the inverter part is greater than a second set reference temperature; If it is determined that the temperature of the inverter part is greater than the second set reference temperature, then when the opening of the second throttling device has reached a preset minimum opening, the opening of the second throttling device is maintained at the preset minimum opening; when the opening of the second throttling device has not reached the preset minimum opening, the opening of the second throttling device is controlled to decrease in a PI adjustment manner; thereby, the temperature of the inverter part is adjusted; If it is determined that the temperature of the inverter part is lower than the second set reference temperature, then when the opening of the second throttling device has reached the preset maximum opening, the opening of the second throttling device is maintained at the preset maximum opening; when the opening of the second throttling device has not reached the preset maximum opening, the opening of the second throttling device is controlled to increase by PI adjustment; thereby, the temperature of the inverter part is adjusted.

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