Inverter thermal management system and methods for chiller units

Abstract

This invention relates to a variable frequency drive (VFD) thermal management system and method for a chiller unit. The chiller unit includes a condensing unit, a compressor, and a throttling valve connected to the condensing unit. The system includes: an electrical control cabinet housing the VFD, a heat dissipation device located at the bottom of the electrical control cabinet, and a heat exchange device. The heat exchange device has a first heat exchange channel for the cooling medium and a second heat exchange channel for the coolant, where the cooling medium and coolant exchange heat. The coolant absorbs heat from the cooling medium, and the cooled medium flows into the heat dissipation device to cool the VFD inside the electrical control cabinet. Precise temperature control is achieved by controlling the flow rate of the cooling medium into the heat dissipation device through a valve. This achieves the technical effect of cooling the VFD using the cooling capacity of the chiller unit itself.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and more specifically, to a frequency converter thermal management system and method for a chiller unit. Background Technology

[0002] In the field of battery temperature control, chiller units are widely used due to their high heat exchange efficiency and more precise temperature control range. The frequency converter is the core component controlling the unit, ensuring high energy efficiency. However, a common challenge is balancing the frequency converter's heat dissipation with its waterproofing.

[0003] Typically, frequency converters are built into electrical control cabinets, and the cooling medium for heat dissipation is primarily air and refrigerant. In existing technologies, one approach is to create air inlets and outlets within the control cabinet for natural cooling, or to use fans for forced convection cooling. This method requires high airflow uniformity and is ineffective at higher ambient temperatures. Another approach utilizes the high-pressure refrigerant condensed by an air conditioning unit to cool the frequency converter. This method requires high refrigerant pressure, placing stringent pressure resistance requirements on the piping, and is inconvenient for maintenance, as it necessitates releasing the refrigerant. Furthermore, at high ambient temperatures, the refrigerant pressure and temperature are even higher, further reducing the effectiveness of heat dissipation for the frequency converter. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a frequency converter thermal management system and method for a chiller unit.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to construct a frequency converter thermal management system and method for a chiller unit.

[0006] In the inverter thermal management system of the chiller unit described in this invention, the chiller unit includes a condensing device (6), a compressor (4) and a throttle valve (5) connected to the condensing device (6); the system includes: an electrical control cabinet (1) with an inverter installed inside, a heat dissipation device (2) installed at the bottom of the electrical control cabinet (1), a heat exchange device (3), and a first pipeline connected to the heat exchange device (3);

[0007] The heat exchange device (3) is provided with a first heat exchange channel for the flow of cooling medium and a second heat exchange channel for the flow of coolant, and the cooling medium and the coolant exchange heat in the heat exchange device (3).

[0008] The first heat exchange channel is provided with a first inlet (31) and a first outlet (32);

[0009] The first pipeline includes a first liquid inlet pipeline connected to the first water inlet (31) and a first liquid outlet pipeline connected to the first water outlet (32). The first liquid inlet pipeline allows the cooling medium to flow into the first heat exchange channel, and the first liquid outlet pipeline allows the cooling medium to flow out of the first heat exchange channel.

[0010] The heat dissipation device (2) is provided with a heat dissipation pipe (21) through which the cooling medium flows. The cooling medium absorbs the heat of the frequency converter inside the electrical control cabinet (1) to achieve heat dissipation.

[0011] The heat dissipation pipe (21) is connected to the first liquid inlet pipe through the second liquid outlet pipe and to the first liquid outlet pipe through the second liquid inlet pipe.

[0012] The second liquid inlet pipe is equipped with a valve (7) to control the flow of the second liquid inlet pipe.

[0013] Preferably, a second pipeline connects the heat exchange device (3) to the compressor (4), the throttle valve (5), and the condenser (6);

[0014] The second heat exchange channel also includes a coolant inlet (34) and a coolant outlet (33);

[0015] The second pipeline includes a third liquid inlet pipeline connecting the coolant inlet (34) and the throttle valve (5), and a third liquid outlet pipeline connecting the coolant outlet (33) and the compressor (4);

[0016] The third liquid outlet pipe supplies the coolant from the second heat exchange channel to the compressor (4), and the third liquid inlet pipe supplies the coolant from the throttle valve (5) to the second heat exchange channel, so that the coolant completes the coolant circulation between the second heat exchange channel, the compressor (4), the throttle valve (5), and the condenser (6) through the second pipe.

[0017] Preferably, the thermal management system of the chiller unit further includes: a circulating water pump (8) that provides circulating power to the cooling medium;

[0018] The circulating water pump (8) is installed on the first liquid outlet pipeline and is located between the valve (7) and the first water outlet (32);

[0019] The circulating water pump (8) is connected to the battery through a third pipeline, allowing the cooling medium to flow from the first outlet (32) to the battery and the heat dissipation pipe (21) to absorb the heat of the battery and reduce the operating temperature of the battery.

[0020] Preferably, thermally conductive silicone grease is applied between the bottom of the electrical control cabinet (1) and the heat dissipation device (2).

[0021] Preferably, the condensation device (6) includes a condenser (61) and a condenser fan (62);

[0022] The condenser (61) is connected to the compressor (4). The compressor (4) compresses and pressurizes the coolant flowing out of the heat exchange device (3) after heat exchange through the third liquid outlet pipe to form a high-pressure, high-temperature coolant gas.

[0023] The condenser (61) condenses the high-pressure, high-temperature coolant gas, and the condenser fan (62) dissipates heat from the high-pressure, high-temperature coolant gas entering the condenser (61), forming a low-temperature, high-pressure coolant liquid that flows to the throttle valve (5).

[0024] Preferably, the valve (7) includes an electric ball valve; the heat dissipation pipe (21) of the heat dissipation device (2) includes a third inlet (212) and a third outlet (211);

[0025] A self-sealing quick connector is connected to the third inlet (212) and the third outlet (211) of the heat dissipation pipe (21) to enable plugging and unplugging under pressure.

[0026] Preferably, the thermal management system of the chiller unit further includes: a temperature monitoring device;

[0027] The temperature monitoring device is electrically connected to the electrical control cabinet (1), monitors the temperature value of the electrical control cabinet, and controls the opening degree of the valve (7) according to the temperature value and the rate of temperature change.

[0028] The inverter thermal management method for chiller units provided by this invention, applied to the inverter thermal management system, includes the following steps:

[0029] Real-time monitoring of the temperature value of the electrical control cabinet and calculation of the temperature change rate;

[0030] Determine whether the temperature value has reached the preset temperature;

[0031] If the determination is yes, then the valve is controlled to open, and the opening degree of the valve is dynamically adjusted according to the rate of temperature change.

[0032] Preferably, dynamically adjusting the valve opening based on the rate of temperature change includes:

[0033] Obtain the maximum and minimum opening of the valve;

[0034] Based on the rate of temperature change, the maximum opening degree, and the minimum opening degree, a linear relationship is established between the valve opening degree and the rate of temperature change.

[0035] Determine whether the rate of temperature change has reached a first preset rate; if so, control the valve to maintain its maximum opening.

[0036] If not, the valve opening is dynamically adjusted based on the linear relationship and the rate of temperature change.

[0037] Preferably, adjusting the valve opening linearly based on the linear relationship and the rate of temperature change includes:

[0038] Determine whether the rate of temperature change has reached the second preset rate;

[0039] If so, the valve opening is adjusted linearly to increase or decrease based on the linear relationship until the temperature value is determined to be less than the preset temperature, at which point the valve is closed.

[0040] If not, maintain the valve at its minimum opening until the temperature value is determined to be less than the preset temperature, then close the valve.

[0041] Wherein, the second preset rate is less than the first preset rate.

[0042] The inverter thermal management system for the chiller unit implementing this invention has the following beneficial effects: The chiller unit includes a condensing unit, a compressor connected to the condensing unit, and a throttling valve; the cooling medium and coolant exchange heat in a heat exchange device; the coolant absorbs heat from the cooling medium, and the cooled medium flows into a heat dissipation device to directly dissipate heat from the inverter in the electrical control cabinet. Pressure control is unnecessary, and the chiller unit's own cooling capacity can be directly utilized to dissipate heat from the inverter. Precise temperature control is achieved by controlling the flow rate of the cooling medium into the heat dissipation device through valves. Attached Figure Description

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0044] Figure 1 This is a schematic diagram of the inverter thermal management system of the chiller unit provided in an embodiment of the present invention;

[0045] Figure 2 This is a flowchart of the inverter thermal management method for a chiller unit provided in an embodiment of the present invention;

[0046] Figure 3 This is a linear relationship graph between valve opening degree and temperature change rate provided in an embodiment of the present invention. Detailed Implementation

[0047] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0048] like Figure 1 As shown, in the first embodiment of the inverter thermal management system of the chiller unit of the present invention, the chiller unit includes a condensing device (6), a compressor (4) and a throttle valve (5) connected to the condensing device (6); the inverter thermal management system includes: an electrical control cabinet (1) with an inverter installed inside, a heat dissipation device (2) installed at the bottom of the electrical control cabinet (1), a heat exchange device (3), and a first pipeline connected to the heat exchange device (3);

[0049] The heat exchange device (3) is provided with a first heat exchange channel for the flow of cooling medium and a second heat exchange channel for the flow of coolant. The cooling medium and the coolant exchange heat in the heat exchange device (3).

[0050] The first heat exchange channel is provided with a first inlet (31) and a first outlet (32); the first pipeline includes a first liquid inlet pipeline connected to the first inlet (31) and a first liquid outlet pipeline connected to the first outlet (32). The first liquid inlet pipeline is used to supply cooling medium to flow into the first heat exchange channel, and the first liquid outlet pipeline is used to supply cooling medium to flow out of the first heat exchange channel.

[0051] The heat dissipation device (2) is equipped with a heat dissipation pipe (21) for circulating cooling medium. The cooling medium absorbs the heat of the inverter inside the electrical control cabinet (1) to achieve heat dissipation. The heat dissipation pipe (21) is connected to the first liquid inlet pipe through the second liquid outlet pipe and to the first liquid outlet pipe through the second liquid inlet pipe. A valve (7) for controlling the flow of the second liquid inlet pipe is also provided on the second liquid inlet pipe.

[0052] In some embodiments, thermal grease is applied between the bottom of the electrical control cabinet (1) and the heat dissipation device (2).

[0053] Specifically, a heat dissipation device (2) is installed at the bottom of the electrical control cabinet (1). Thermal grease is applied between the heat dissipation device (2) and the electrical control cabinet (1) to ensure good contact and reduce thermal resistance. The heat exchange device (3) is an evaporator. The cooling medium flows in the first heat exchange channel of the heat exchange device (3), and the coolant flows in the second heat exchange channel of the heat exchange device (3). When the cooling medium and the coolant exchange heat, the coolant absorbs the heat of the cooling medium, causing the temperature of the cooling medium to decrease, and the temperature of the coolant to increase and vaporize, thus achieving heat exchange. The frequency converter is installed inside the electrical control cabinet (1). The bottom of the frequency converter is closely attached to the mounting sheet metal and fixed inside the electrical control cabinet (1) by the mounting sheet metal.

[0054] The cooling medium flowing out of the first outlet (32) of the first heat exchange channel of the heat exchange device (3) flows into the heat dissipation channel (21) of the heat dissipation device (2) through the second liquid outlet pipe. The cooling medium absorbs the heat of the inverter inside the electrical control cabinet (1) so as to reduce the operating temperature of the inverter and improve the energy efficiency of the unit.

[0055] In some embodiments, the inverter thermal management system further includes: a circulating water pump (8) that provides circulating power for the cooling medium; the circulating water pump (8) is disposed on the first liquid outlet pipeline and between the valve (7) and the first water outlet (32); the water outlet of the circulating pump (8) is connected to the battery through a third pipeline, so that the cooling medium flows from the first water outlet (32) to the battery and the heat dissipation pipe (21) so that the cooling medium absorbs the heat of the battery and reduces the operating temperature of the battery.

[0056] Specifically, after the cooling medium flows out from the first outlet (32) of the first heat exchange channel of the heat exchange device (3), it is circulated by the circulating water pump (8), so that part of the cooling medium flows into the heat dissipation device (2) and part flows to the battery through the third pipeline. This allows the cooling medium to absorb the heat of the battery and reduce the battery's operating temperature. This achieves the goal of the chiller unit dissipating heat from the battery while using the cooling capacity of the unit itself to dissipate heat from the inverter. Furthermore, the circulating water pump (8) is located between the valve (7) and the first outlet (32) of the heat exchange device (3), which prevents the cooling medium that has already flowed into the heat dissipation pipe (21) from flowing back after it flows into the heat dissipation pipe (21).

[0057] In some embodiments, the inverter thermal management system further includes: a second pipeline connecting the heat exchange device (3) with the compressor (4), the throttle valve (5), and the condenser (6); the second heat exchange channel further includes a coolant inlet (34) and a coolant outlet (33);

[0058] The second pipeline includes a third liquid inlet pipeline connecting the coolant inlet (34) and the throttle valve (5), and a third liquid outlet pipeline connecting the coolant outlet (33) and the compressor (4); the third liquid outlet pipeline supplies coolant to flow from the second heat exchange channel to the compressor (4), and the third liquid inlet pipeline supplies coolant to flow from the throttle valve (5) to the second heat exchange channel, so that the coolant completes the coolant circulation between the second heat exchange channel, the compressor (4), the throttle valve (5), and the condenser (6) through the second pipeline.

[0059] Specifically, the first heat exchange channel of the heat exchange device (3) is circulated with cooling medium, and after the cooling medium flows out from the first liquid outlet pipe, it flows into the heat dissipation pipe (21) of the heat dissipation device (2) through the circulating water pump (8) and the second liquid inlet pipe, and flows to the battery through the third pipe, so that the cooling unit can dissipate heat to the battery while also using its own cooling capacity to dissipate heat to the frequency converter.

[0060] The coolant flows through the second heat exchange channel of the heat exchange device (3). After the coolant absorbs heat from the cooling medium in the heat exchange device (3), its temperature rises and it flows out from the coolant outlet (33) of the second heat exchange channel. It then flows through the third liquid outlet pipe, sequentially to the compressor (4), the condenser (6), and the throttle valve (5), before entering the second heat exchange channel from the coolant inlet (34). The coolant then exchanges heat again with the cooling medium in the first heat exchange channel in the second heat exchange channel, absorbing heat from the cooling medium and flowing out from the coolant outlet (33). This allows the coolant to complete a coolant circulation between the heat exchange device (3), the compressor (4), the throttle valve (5), and the condenser (6).

[0061] In some embodiments, the condensing device (6) includes a condenser (61) and a condensing fan (62); the condenser (61) is connected to the compressor (4), and the compressor (4) compresses and pressurizes the coolant flowing out of the heat exchange device (3) after heat exchange through the third liquid outlet pipe to form a high-pressure high-temperature coolant gas; the condenser (61) condenses the high-pressure high-temperature coolant gas flowing in, and the condensing fan (62) dissipates the high-pressure high-temperature coolant gas entering the condenser (61) to form a low-temperature high-pressure coolant liquid, which flows to the throttle valve (5); the throttle valve (5) depressurizes the low-temperature high-pressure coolant liquid and then flows to the heat exchange device (3) through the second liquid inlet pipe so that the coolant absorbs the heat of the cooling medium in the heat exchange device and completes the circulation of the coolant.

[0062] In some embodiments, the valve (7) includes an electric ball valve; the heat dissipation pipe (21) of the heat dissipation device (2) includes a third inlet (212) and a third outlet (211); a self-sealing quick connector is connected to the third inlet (212) and the third outlet (211) of the heat dissipation pipe (21) respectively to realize plugging and unplugging under pressure, so that when the frequency converter in the electrical control cabinet is maintained, it can be directly disassembled by unplugging the self-sealing quick connector and there is no leakage during plugging and unplugging.

[0063] Preferably, the heat dissipation device (2) includes a heat dissipation plate; the heat exchange device (3) includes a plate heat exchanger; the plate heat exchanger includes two heat exchange pipes; the cooling medium enters the first heat exchange pipe from the first inlet (31) and flows out of the first heat exchange pipe from the first outlet (32); the coolant enters the second heat exchange pipe from the coolant inlet (34) and flows out of the second heat exchange pipe from the coolant outlet (33).

[0064] Optionally, a solenoid valve or a manual ball valve may be installed on the third liquid outlet pipe and the third liquid inlet pipe of the heat dissipation device (2) to automatically or manually cut off the flow of cooling medium to the heat dissipation pipe (21) when the frequency converter or electrical control cabinet needs to be maintained.

[0065] refer to Figure 1 In one specific embodiment:

[0066] The cooling medium flows out from the return water end and enters the first heat exchange channel of the heat exchange device (3) through the first liquid inlet pipe from the first water inlet (31); the cooling medium flows in the first heat exchange channel of the heat exchange device (3) and exchanges heat with the coolant in the second heat exchange channel. The coolant absorbs the heat of the cooling medium, so that the cooling medium is cooled.

[0067] After cooling, the cooling medium flows out from the first outlet (32) of the first heat exchange channel to the first liquid outlet pipe, and then flows into the heat dissipation pipe (21) of the heat dissipation device (2) through the circulating water pump (8) and the second liquid inlet pipe, and then flows to the battery through the third pipe, so as to realize the cooling of the inverter and the battery by the chiller unit. After absorbing the heat of the inverter and the battery, the cooling medium flows to the first liquid inlet pipe through the third outlet (211) of the heat dissipation pipe (21), and flows to the return water end through the water supply end, so as to realize the circulation of the cooling medium.

[0068] Coolant flows through the second heat exchange channel of the heat exchange device (3). After the coolant absorbs heat from the cooling medium and vaporizes, it flows out from the coolant outlet (33) of the second heat exchange channel. It flows to the compressor (4) through the third liquid outlet pipe. The compressor (4) compresses and pressurizes the coolant flowing out of the heat exchange device (3) after heat exchange through the third liquid outlet pipe to form a high-pressure, high-temperature coolant gas.

[0069] The condenser (61) condenses the high-pressure, high-temperature coolant gas, and the condenser fan (62) dissipates the heat from the high-pressure, high-temperature coolant gas entering the condenser (61) to form a low-temperature, high-pressure coolant liquid, which flows to the throttle valve (5); the throttle valve (5) reduces the pressure of the low-temperature, high-pressure coolant liquid and then flows into the second heat exchange channel of the heat exchange device (3) through the second liquid inlet pipe;

[0070] The coolant exchanges heat again with the cooling medium in the first heat exchange channel in the second heat exchange channel, absorbing heat from the cooling medium before flowing out from the coolant outlet (33). This allows the coolant to complete a coolant circulation between the heat exchange device (3), compressor (4), expansion valve (5), and condenser (6). When the chiller unit is running in cooling mode, the heat exchange device (3) acts as an evaporator, operating at a low temperature, directly utilizing the cooling capacity of the unit itself to meet the cooling requirements of the frequency converter.

[0071] It should also be noted that the coolant is a refrigerant, which can be a refrigerant commonly used in related technologies. The refrigerant is used to transfer heat. Since the frequency converter cools down by absorbing heat through the cooling medium flowing through the heat dissipation device (2), and the cooling medium is usually a cooling liquid such as water or ethylene glycol, the technical effect of cooling the frequency converter by using the cooling capacity of the unit body is achieved without strictly considering the pressure problem.

[0072] exist Figure 2 The illustrated embodiment of the inverter thermal management method for a chiller unit of the present invention is applied to the inverter thermal management system of a chiller unit; it includes the following steps:

[0073] Step S1: Monitor the temperature value of the electrical control cabinet in real time and calculate the rate of temperature change;

[0074] Specifically, to better control the valve opening, when detecting the temperature value T of the frequency converter inside the control cabinet, the rate of temperature change of the frequency converter inside the control cabinet is also calculated. This rate of temperature change can be the rate of temperature rise, that is, the change in the temperature value of the control cabinet over a period of time. The formula for calculating the rate of temperature rise is as follows:

[0075] v = ΔT / Δt (1).

[0076] Where v is the rate of temperature change; Δt is the set time; ΔT is the change in temperature T of the electrical control cabinet within the set time; optionally, ΔT ranges from 3 to 10 seconds.

[0077] Step S2: Determine whether the temperature value T has reached the preset temperature T1;

[0078] Specifically, when monitoring the temperature of the frequency converter in the electrical control cabinet in real time, the temperature of the frequency converter and other power devices will rise when they are working. However, under normal circumstances, additional heat dissipation work is only required when the preset temperature is reached, so as to avoid wasting heat dissipation resources and effectively control the temperature.

[0079] Step S3: If the determination is yes, then control the valve to open and dynamically adjust the valve opening degree according to the rate of temperature change.

[0080] In some embodiments, the step S3 of dynamically adjusting the valve opening according to the temperature change rate v includes the following steps:

[0081] S31: Obtain the maximum and minimum valve opening;

[0082] S32: Based on the rate of temperature change, the maximum opening degree, and the minimum opening degree, establish a linear relationship between the valve opening degree and the rate of temperature change v.

[0083] S33: determining whether a temperature change rate v reaches a first preset rate v1;

[0084] S34: if yes, controlling a valve to maintain a maximum opening degree;

[0085] S35: if no, dynamically adjusting the opening degree of the valve according to the temperature change rate v in combination with a linear relationship.

[0086] S351: determining whether the temperature change rate v reaches a second preset rate v2;

[0087] S352: if yes, adjusting the opening degree of the valve to linearly increase or decrease in combination with the linear relationship until it is determined that the temperature value is less than a preset temperature, and closing the valve;

[0088] S353: if no, maintaining the minimum opening degree of the valve until it is determined that the temperature value is less than the preset temperature, and closing the valve; wherein the second preset rate v2 is less than the first preset rate v1.

[0089] Specifically, as Figures 2-3 shown, Figure 2 is a flowchart of a frequency converter heat management method for a chiller; Figure 3 is a linear relationship diagram of valve opening degree and temperature change rate.

[0090] When it is determined that the temperature value T of an electric control cabinet reaches a preset temperature, a cooling medium in a heat exchange device (3) needs to be drained to a heat dissipation device (2) to dissipate heat for a frequency converter in the electric control cabinet. At this time, in order to better control the flow of the cooling medium, the opening degree of the valve arranged on a second liquid inlet pipeline needs to be controlled.

[0091] When it is determined that the temperature value T of the electric control cabinet reaches a preset temperature T1, the valve is controlled to open, and the opening degree of the valve is determined according to a pre-calculated temperature change rate v, wherein the temperature change rate v at this time is calculated before the valve is opened, so that when the opening degree of the valve is determined according to the temperature change rate v, temperature control can be accurately performed, and the opening degree of the valve is determined according to the temperature change rate condition before control, which can effectively avoid the hysteresis of temperature control.

[0092] When the temperature value T reaches the preset temperature T1 and the temperature change rate v < v2, the valve is controlled to open and maintain the minimum opening degree; and the temperature value of the electric control cabinet is continuously monitored in real time and the temperature change rate is calculated. If T gradually decreases and is less than the preset temperature T1, the valve is controlled to close; if the temperature change rate v still increases and v1 > v ≥ v2, according to Figure 3 the linear relationship shown, the opening degree of the valve is dynamically adjusted, so that the opening degree of the valve is linearly increased, so as to increase the heat dissipation rate of the frequency converter in the electric control cabinet by the cooling medium.

[0093] When v1 > v ≥ v2, according to Figure 3 the linear relationship shown to dynamically adjust the opening degree of the valve; until v<v2, the valve is controlled to maintain the minimum opening degree; until T is less than a preset temperature, the valve is controlled to be closed.

[0094] When v>v1, that is, the temperature of the electric control cabinet rises rapidly in a short time, the valve is controlled to maintain the maximum opening degree at this time, so that the frequency converter in the electric control cabinet can dissipate heat quickly and efficiently. Since the valve maintains the maximum opening degree, the cooling medium flowing through the heat dissipation device (2) dissipates heat quickly for the frequency converter, so that the temperature value T of the electric control cabinet decreases, and the temperature change rate v also decreases at the same time; when the temperature change rate v decreases to v≤v1-Δv, according to Figure 3 the linear relationship shown to dynamically adjust the opening degree of the valve; until v<v2, the valve is controlled to maintain the minimum opening degree; until T is less than the preset temperature T1, the valve is closed. Wherein, Δv is the hysteresis of the temperature change rate.

[0095] The various embodiments in this specification are described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and relevant parts can be referred to the description of the method section.

[0096] Skilled persons can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in accordance with the functions in the above description. Whether these functions are implemented by hardware or software depends on the specific application and design constraints of the technical solution. Skilled persons can use different methods to implement the described functions for each specific application, but such implementation should not be considered as exceeding the scope of the present invention.

[0097] The steps of the method or algorithm described in combination with the embodiments disclosed herein can be directly implemented by hardware, a software module executed by a processor, or a combination of the two. The software module can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROM, or any other form of storage medium well known in the technical field.

[0098] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose thereof is to enable persons familiar with the art to understand the content of the present invention and implement the present invention accordingly, and cannot limit the protection scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the claims of the present invention shall fall within the coverage of the claims of the present invention.

Claims

1. A variable frequency drive thermal management system for a chiller unit, the chiller unit comprising a condensing unit (6), and a compressor (4) and a throttle valve (5) connected to the condensing unit (6); characterized in that, include: An electrical control cabinet (1) with an internal frequency converter, a heat dissipation device (2) located at the bottom of the electrical control cabinet (1), a heat exchange device (3), and a first pipeline connected to the heat exchange device (3); The heat exchange device (3) is provided with a first heat exchange channel for the flow of cooling medium and a second heat exchange channel for the flow of coolant, and the cooling medium and the coolant exchange heat in the heat exchange device (3); The first heat exchange channel is provided with a first inlet (31) and a first outlet (32); The first pipeline includes a first liquid inlet pipeline connected to the first water inlet (31) and a first liquid outlet pipeline connected to the first water outlet (32). The first liquid inlet pipeline allows the cooling medium to flow into the first heat exchange channel, and the first liquid outlet pipeline allows the cooling medium to flow out of the first heat exchange channel. The heat dissipation device (2) is provided with a heat dissipation pipe (21) through which the cooling medium flows. The cooling medium absorbs the heat of the frequency converter inside the electrical control cabinet (1) to achieve heat dissipation. The heat dissipation pipe (21) is connected to the first liquid inlet pipe through the second liquid outlet pipe and to the first liquid outlet pipe through the second liquid inlet pipe. The second liquid inlet pipe is equipped with a valve (7) to control the flow of the second liquid inlet pipe; A circulating water pump (8) that provides circulating power for the cooling medium; The circulating water pump (8) is installed on the first liquid outlet pipe and between the valve (7) and the first water outlet (32); the water outlet of the circulating water pump (8) is connected to the battery through the third pipe, so that the cooling medium flows from the first water outlet (32) to the battery and the heat dissipation pipe (21) so that the cooling medium absorbs the heat of the battery and reduces the working temperature of the battery. Thermal grease is applied between the bottom of the electrical control cabinet (1) and the heat dissipation device (2); A second pipeline connecting the heat exchange device (3) to the compressor (4), the throttle valve (5), and the condenser (6); The second heat exchange channel also includes a coolant inlet (34) and a coolant outlet (33); The second pipeline includes a third liquid inlet pipeline connecting the coolant inlet (34) and the throttle valve (5), and a third liquid outlet pipeline connecting the coolant outlet (33) and the compressor (4); The third liquid outlet pipe supplies the coolant from the second heat exchange channel to the compressor (4), and the third liquid inlet pipe supplies the coolant from the throttle valve (5) to the second heat exchange channel, so that the coolant completes the coolant circulation between the second heat exchange channel, the compressor (4), the throttle valve (5), and the condenser (6) through the second pipe.

2. The inverter thermal management system for a chiller unit according to claim 1, characterized in that, The condensation device (6) includes a condenser (61) and a condenser fan (62); The condenser (61) is connected to the compressor (4). The compressor (4) compresses and pressurizes the coolant flowing out of the heat exchange device (3) after heat exchange through the third liquid outlet pipe to form a high-pressure, high-temperature coolant gas. The condenser (61) condenses the high-pressure, high-temperature coolant gas, and the condenser fan (62) dissipates heat from the high-pressure, high-temperature coolant gas entering the condenser (61), forming a low-temperature, high-pressure coolant liquid that flows to the throttle valve (5).

3. The inverter thermal management system for a chiller unit according to claim 2, characterized in that, The valve (7) includes an electric ball valve; the heat dissipation pipe (21) of the heat dissipation device (2) includes a third inlet (212) and a third outlet (211). A self-sealing quick connector is connected to the third inlet (212) and the third outlet (211) of the heat dissipation pipe (21) to enable plugging and unplugging under pressure.

4. The inverter thermal management system for a chiller unit according to claim 3, characterized in that, Also includes: Temperature monitoring device; The temperature monitoring device is electrically connected to the electrical control cabinet (1), monitors the temperature value of the electrical control cabinet, and controls the opening degree of the valve (7) according to the temperature value and the rate of temperature change.

5. A method for thermal management of a frequency converter in a chiller unit, applied to the frequency converter thermal management system described in any one of claims 1 to 4; characterized in that, Includes the following steps: Real-time monitoring of the temperature value of the electrical control cabinet and calculation of the temperature change rate; Determine whether the temperature value has reached the preset temperature; If the determination is yes, then the valve is controlled to open, and the opening degree of the valve is dynamically adjusted according to the rate of temperature change.

6. The inverter thermal management method for a chiller unit according to claim 5, characterized in that, The dynamic adjustment of the valve opening based on the rate of temperature change includes: Obtain the maximum and minimum opening of the valve; Based on the temperature change rate, the maximum opening degree, and the minimum opening degree, a linear relationship is established between the valve opening degree and the temperature change rate. Determine whether the rate of temperature change has reached a first preset rate; if so, control the valve to maintain its maximum opening. If not, the valve opening is dynamically adjusted based on the linear relationship and the rate of temperature change.

7. The inverter thermal management method for a chiller unit according to claim 6, characterized in that, Incorporating the aforementioned linear relationship and linearly adjusting the valve opening based on the rate of temperature change includes: Determine whether the rate of temperature change has reached the second preset rate; If so, the valve opening is adjusted linearly to increase or decrease based on the linear relationship until the temperature value is determined to be less than the preset temperature, at which point the valve is closed. If not, maintain the valve at its minimum opening until the temperature value is determined to be less than the preset temperature, then close the valve. Wherein, the second preset rate is less than the first preset rate.

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