Thermal management system for direct cooling heat pipe type frequency converter

Abstract

The utility model discloses a heat management system for a direct cooling heat pipe type frequency converter, and aims to solve the problems of low cooling efficiency or complex structure and liquid leakage risk of the conventional frequency converter heat management system. The direct cooling device comprises a condenser, a condensation fan, a liquid storage device, a refrigerant pump, a liquid separator, a direct cooling plate and pipelines for connecting all the components. The direct cooling device is simple in structure and convenient to operate, a natural cold source is fully utilized through heat pipe refrigeration circulation, at the moment, only a cooling fan and a refrigerant pump work, the refrigerant for phase-change heat exchange cooling and pressure reduction between the natural cold source and the refrigerant enters the direct cooling plate to conduct evaporation heat exchange cooling with the heating part of the frequency converter, the heat exchange efficiency is higher, and more energy is saved; refrigerant directly enters the direct cooling plate attached to the heating portion of the frequency converter to directly cool the heating surface of the frequency converter, and the whole refrigeration pipeline is completely sealed, free of leakage risk and free of regular maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of frequency converter heat management, in particular to a direct-cooling heat pipe type heat management system for frequency converter. BACKGROUND

[0002] The cooling of the existing frequency converter heat management system mainly includes air cooling and liquid cooling, wherein,

[0003] The principle of air cooling is mainly to make air flow through external fans and take away heat through metal heat sinks, but the cooling efficiency is low, especially in high-power devices, and is easily affected by environmental temperature.

[0004] The principle of liquid cooling is mainly to take away heat through liquid circulation, usually using a mixed solution of deionized water and ethylene glycol as the cooling medium, which has high heat dissipation efficiency and is suitable for high-power devices, but the structure is complex, needs regular maintenance, and there is a risk of liquid leakage, see Figure 1 , including a dry cooler 7, a circulating pump 9, an expansion tank 10, a liquid supplement tank 12 and a liquid cooling plate 13 connected in turn in a closed loop, and a condensing fan 2, an exhaust valve 8 and a liquid supplement pump 11, the condensing fan 2 is installed outside the dry cooler 7 to accelerate air flow, and the liquid supplement pump 11 supplements the liquid in the liquid supplement tank 12 to the system.

[0005] In the above-mentioned liquid cooling heat management system, the following problems exist:

[0006] 1. Since the cooling medium is single-phase heat exchange, it can only rely on temperature difference to exchange heat, and only when the environmental temperature is very low can the heat exchange performance be met, so the time for using natural cooling all year round is relatively short, and the energy saving rate is low;

[0007] 2. The cooling medium side pipeline is complex, has many connecting components, has low reliability, and the pipeline is not completely sealed, so the cooling medium leakage risk is large, and it is also easy to evaporate, so regular maintenance is required. CONTENT OF THE INVENTION

[0008] Therefore, the present application provides a direct-cooling heat pipe type heat management system for frequency converter to solve the problems of low cooling efficiency or complex structure and liquid leakage risk existing in the existing frequency converter heat management system.

[0009] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0010] A direct-cooling heat pipe type heat management system for frequency converter, comprising: a condenser, a condensing fan, a liquid accumulator, a refrigerant pump, a liquid distributor, a direct-cooling plate and a pipeline connecting each component;

[0011] The condensing fan is used to accelerate the air flow around the condenser;

[0012] The liquid accumulator is used for storing refrigerant liquid, and the inlet of the liquid accumulator is connected with the outlet of the condenser;

[0013] The refrigerant pump is used for driving refrigerant flow, and the inlet of the refrigerant pump is connected with the outlet of the liquid accumulator;

[0014] The distributor is used for uniformly distributing the refrigerant to a plurality of the direct cooling plates, and the inlet of the distributor is connected with the outlet of the refrigerant pump;

[0015] The direct cooling plate is used for heat exchange with the heat generating parts of the frequency converter, and the number of the direct cooling plates corresponds to the number of the frequency converters; the inlets of the plurality of direct cooling plates are connected with the outlet of the distributor, and the outlets of the plurality of direct cooling plates are connected with the inlet of the condenser.

[0016] Optionally, the number of the plurality of direct cooling plates is 1-10.

[0017] Optionally, the inlet of the liquid accumulator is connected with the outlet of the condenser through a first pipeline, the outlet of the liquid accumulator is connected with the inlet of the refrigerant pump through a second pipeline, the outlet of the refrigerant pump is connected with the inlet of the distributor through a third pipeline, the outlet of the distributor is connected with the inlets of the plurality of direct cooling plates through a plurality of first branch pipelines, the outlets of the plurality of direct cooling plates are connected with a fourth pipeline through a plurality of second branch pipelines, and the fourth pipeline is also connected with the inlet of the condenser.

[0018] Optionally, the application further comprises a controller and a sensor assembly connected with the controller, and the controller is also connected with the refrigerant pump and the condenser fan;

[0019] The sensor assembly comprises a plurality of temperature sensors and a plurality of pressure sensors, and the liquid accumulator, the condenser, and the direct cooling plate are all provided with temperature sensors and first pressure sensors, and the outlet of the distributor is provided with a second pressure sensor.

[0020] Optionally, the refrigerant is of a hydrocarbon type, a hydrochlorofluorocarbon type, a hydrofluorocarbon type, or a hydrofluoroolefin type.

[0021] Optionally, the refrigerant is one of R22, R134A, R407C, R410A, R513A, R515B, R454B, R454C, R404A, R1234YF, R1234ZE, R32, and R290.

[0022] Compared with the prior art, the application has at least the following beneficial effects:

[0023] 1. The present application is based on further analysis and research on the problems of the prior art, and provides a heat management system for a direct-cooling heat pipe type frequency converter, relating to the technical field of frequency converter heat management, comprising a condenser, a condensing fan, a liquid accumulator, a refrigerant pump, a distributor, a direct-cooling plate, and pipelines connecting the components, in the heat pipe refrigeration mode, the refrigerant pump is turned on, and the refrigerant is driven by the refrigerant pump to pass through the liquid accumulator, the refrigerant pump, the distributor, the direct-cooling plate, and the condenser in turn and then return to the liquid accumulator, to complete the heat pipe refrigeration cycle; the present application has simple structure and convenient operation, and fully utilizes the natural cold source by adopting the heat pipe refrigeration cycle, at this time, only the heat dissipation fan and the refrigerant pump work, the refrigerant that is cooled and depressurized by phase change between the natural cold source and the refrigerant evaporates and exchanges heat with the heat generating part of the frequency converter in the direct-cooling plate, compared with water-based or other non-phase-change cold carriers, the heat exchange efficiency is higher and more energy-saving; the complex components such as the cold carrier side pipeline, the circulating pump, the expansion tank, the liquid supplement pump, and the liquid supplement tank in the prior art are removed, the refrigerant directly enters the direct-cooling plate that is attached to the heat generating part of the frequency converter, and the heat generating surface of the frequency converter is directly cooled, and the entire refrigeration pipeline is completely sealed, without leakage risk and the need for regular maintenance, since the refrigerant directly enters the direct-cooling plate and directly operates in the heat pipe mode, the heat generating part of the frequency converter is cooled, and the heat exchange efficiency of the refrigerant in the heat pipe mode is higher than that of single-phase temperature difference heat exchange, with obvious energy-saving effect.

[0024] 2. The present application also comprises a controller and a sensor assembly connected to the controller, for real-time monitoring and automatic control of the operating state of each component, so as to ensure that the heat management system can efficiently and safely operate as needed, and provide convenient management and monitoring functions for users. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more directly illustrate the prior art and the present application, the following exemplary drawings are given. It should be understood that the specific shapes, structures shown in the drawings should not be regarded as limiting conditions in the implementation of the present application; for example, based on the technical concepts and exemplary drawings disclosed in the present application, those skilled in the art can easily make routine adjustments or further optimization on the increase / decrease / ownership division, specific shape, positional relationship, connection mode, size ratio relationship, etc. of certain units (components).

[0026] Figure 1 The structure block diagram of the liquid-cooled heat management system in the prior art;

[0027] Figure 2 The total structure block diagram of the heat management system for a direct-cooling heat pipe type frequency converter provided by one embodiment of the present application.

[0028] EXPLANATION OF REFERENCE NUMERALS:

[0029] 1, condenser; 2, condensing fan; 3, liquid reservoir; 4, refrigerant pump; 5, distributor; 6, direct cooling plate; 7, dry cooler; 8, exhaust valve; 9, circulating pump; 10, expansion tank; 11, liquid supplement pump; 12, liquid supplement tank; 13, liquid cooling plate;

[0030] 14, first pipeline; 15, second pipeline; 16, third pipeline; 17, fourth pipeline; 18, first branch pipeline; 19, second branch pipeline. DETAILED DESCRIPTION

[0031] The present application will be further described in conjunction with the specific embodiments and with reference to the accompanying drawings.

[0032] In the description of the present application: unless otherwise specified, the meaning of "a plurality of" is two or more. The terms "first", "second", "third", etc. in the present application are intended to distinguish the objects referred to, and do not have a special meaning in the technical connotation aspect (for example, it should not be understood as emphasizing the importance or order, etc.). The expressions "include", "contain", "have" and the like also mean "not limited to" (certain units, components, materials, steps, etc.).

[0033] The terms such as "upper", "lower", "left", "right", "intermediate" and the like referred to in the present application are generally made for the purpose of indicating the relative position relationship for easy visual understanding with reference to the drawings, and are not an absolute limitation on the position relationship in the actual product.

[0034] One embodiment of the present application is a heat management system for a direct cooling heat pipe type frequency converter, as shown in the figure, comprising: a condenser 1, a condensing fan 2, a liquid reservoir 3, a refrigerant pump 4, a distributor 5, a direct cooling plate 6, and a pipeline connecting between each component; Figure 2

[0035] The condensing fan 2 is used to accelerate the air flow around the condenser 1;

[0036] The liquid reservoir 3 is used to store refrigerant liquid, and the inlet of the liquid reservoir 3 is connected with the outlet of the condenser 1;

[0037] The refrigerant pump 4 is used to drive the flow of refrigerant, and the inlet of the refrigerant pump 4 is connected with the outlet of the liquid reservoir 3;

[0038] The distributor 5 is used to uniformly distribute the refrigerant to a plurality of direct cooling plates 6, and the inlet of the distributor 5 is connected with the outlet of the refrigerant pump 4;

[0039] The direct cooling plate 6 is used for heat exchange with the heat generating parts of the frequency converter, and the number of direct cooling plates 6 corresponds to the number of frequency converters one by one; the inlets of the plurality of direct cooling plates 6 are connected with the outlet of the distributor 5, and the outlets of the plurality of direct cooling plates 6 are connected with the inlet of the condenser 1.

[0040] ​Preferably, the number of the plurality of direct cooling plates 6 is 1-10.

[0041] Further preferably, the pipeline comprises a first pipeline 14, a second pipeline 15, a third pipeline 16 and a fourth pipeline 17.

[0042] The inlet of the liquid reservoir 3 is connected to the outlet of the condenser 1 through the first pipeline 14, the outlet of the liquid reservoir 3 is connected to the inlet of the refrigerant pump 4 through the second pipeline 15, the outlet of the refrigerant pump 4 is connected to the inlet of the distributor 5 through the third pipeline 16, the outlet of the distributor 5 is connected to the inlet of the plurality of direct cooling plates 6 through a plurality of first branch pipelines 18, the outlet of the plurality of direct cooling plates 6 is connected to the fourth pipeline 17 through a plurality of second branch pipelines 19, and the fourth pipeline 17 is also connected to the inlet of the condenser 1.

[0043] Preferably, it further comprises a controller and a sensor assembly connected to the controller, and the controller is also connected to the refrigerant pump 4 and the condenser fan 2.

[0044] The sensor assembly comprises a plurality of temperature sensors and a plurality of pressure sensors, and the liquid reservoir 3, the condenser 1 and the direct cooling plate 6 are all provided with temperature sensors and first pressure sensors; the outlet of the distributor 5 is provided with a second pressure sensor; the controller and the sensor assembly are arranged to detect and control the operating state of each component to ensure that the thermal management system can automatically operate as needed.

[0045] Preferably, the refrigerant is hydrocarbon, hydrochlorofluorocarbon, hydrofluorocarbon or hydrofluoroolefin.

[0046] Preferably, the refrigerant is one of R22, R134A, R407C, R410A, R513A, R515B, R454B, R454C, R404A, R1234YF, R1234ZE, R32 and R290.

[0047] The above-mentioned thermal management system can operate in a heat pipe refrigeration mode, and the operation process is as follows:

[0048] In this mode, the refrigerant pump 4 is turned on, the refrigerant pump 4 sucks the refrigerant liquid in the liquid reservoir 3, passes through the refrigerant pump 4, enters the distributor 5 and is evenly distributed to each direct cooling plate 6 to evaporate by absorbing heat, and then exchanges heat with the heating part of the frequency converter to become gaseous refrigerant, the gaseous refrigerant enters the condenser 1, exchanges heat with the outside air through the condenser fan 2, and the refrigerant becomes liquid and enters the liquid reservoir 3, is sucked into the direct cooling plate 6 by the refrigerant pump 4 again, and then enters the condenser 1 to complete a heat pipe refrigeration cycle.

[0049] Any technical features in the above embodiments can be combined (as long as the combinations of the technical features do not contradict each other), and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; the embodiments not explicitly written in the above description should also be considered as the scope of the present disclosure.

Claims

1. A thermal management system for a direct-cooled heat pipe type frequency converter, characterized by, It comprises: a condenser (1), a condenser fan (2), a liquid storage (3), a refrigerant pump (4), a distributor (5), a direct cooling plate (6), and pipes connecting each component; the condenser fan (2) is used to accelerate the air flow around the condenser (1); the liquid storage (3) is used to store refrigerant liquid, and the inlet of the liquid storage (3) is connected with the outlet of the condenser (1); the refrigerant pump (4) is used to drive the flow of refrigerant, and the inlet of the refrigerant pump (4) is connected with the outlet of the liquid storage (3); the distributor (5) is used to evenly distribute the refrigerant to multiple direct cooling plates (6), and the inlet of the distributor (5) is connected with the outlet of the refrigerant pump (4); the direct cooling plate (6) is used for heat exchange with the heat generating part of the frequency converter, and the number of direct cooling plates (6) corresponds to the number of frequency converters; the inlets of multiple direct cooling plates (6) are connected with the outlet of the distributor (5), and the outlets of multiple direct cooling plates (6) are connected with the inlet of the condenser (1).

2. The direct-cooling heat pipe type thermal management system for frequency inverter according to claim 1, characterized by, The number of multiple direct cooling plates (6) is 1-10.

3. The direct-cooling heat pipe type frequency inverter thermal management system according to claim 1, characterized by, The inlet of the liquid storage (3) is connected with the outlet of the condenser (1) through a first pipe (14), the outlet of the liquid storage (3) is connected with the inlet of the refrigerant pump (4) through a second pipe (15), the outlet of the refrigerant pump (4) is connected with the inlet of the distributor (5) through a third pipe (16), the outlet of the distributor (5) is connected with the inlets of multiple direct cooling plates (6) through multiple first branch pipes (18), the outlets of multiple direct cooling plates (6) are connected with a fourth pipe (17) through multiple second branch pipes (19), and the fourth pipe (17) is also connected with the inlet of the condenser (1).

4. A direct-cooling heat pipe type thermal management system for frequency converters according to any of claims 1-3, characterized in that, It also comprises: a controller and a sensor assembly connected with the controller, and the controller is also connected with the refrigerant pump (4) and the condenser fan (2); the sensor assembly comprises multiple temperature sensors and multiple pressure sensors, and temperature sensors and first pressure sensors are arranged on the liquid storage (3), the condenser (1), and the direct cooling plate (6), and a second pressure sensor is arranged at the outlet of the distributor (5).

5. The direct-cooling heat pipe type frequency inverter thermal management system according to claim 1, characterized by, The refrigerant uses hydrocarbon, hydrochlorofluorocarbon, hydrofluorocarbon, or hydrofluoroolefin.

6. The direct-cooling heat pipe type frequency inverter thermal management system according to claim 1, characterized by, The refrigerant uses one of R22, R134A, R407C, R410A, R513A, R515B, R454B, R454C, R404A, R1234YF, R1234ZE, R32, and R290.

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