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A frequency converter thermal management system for an air-conditioning unit, an air-conditioning unit and a control method

A technology for air-conditioning units and frequency converters, applied in mechanical equipment and other directions, can solve the problems of reducing reliability and economy, increasing system complexity, unfavorable anti-condensation design, etc., to improve reliability and working conditions applicability, Strong adaptability and the effect of improving cooling reliability

Active Publication Date: 2022-07-19
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the cooling temperature of the refrigerant may be lower than the ambient temperature. Compared with the traditional water-cooled and air-cooled systems, there may be a new problem of condensation.
The existing system usually installs the control valve upstream of the frequency converter, which is not conducive to the anti-condensation design
[0005] In particular, for multi-power module inverters, the cooling branches of each module need to be designed in parallel. If temperature control components are installed on each branch, the complexity of the system will be significantly increased, and its reliability and economy will be reduced.

Method used

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  • A frequency converter thermal management system for an air-conditioning unit, an air-conditioning unit and a control method
  • A frequency converter thermal management system for an air-conditioning unit, an air-conditioning unit and a control method
  • A frequency converter thermal management system for an air-conditioning unit, an air-conditioning unit and a control method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] like figure 1 As shown, the frequency converter thermal management system of the air conditioning unit of this embodiment includes a control unit, a temperature detection unit, a frequency converter cooling unit 4, a first switch module 43 and a second switch module 44. The control unit is respectively connected with the temperature detection unit, The first switch module 43 is connected with the second switch module 44; the inlet end of the inverter cooling unit 4 is connected to the condenser 2 in the refrigeration system of the air conditioner unit through the second switch module 44, and the outlet end of the inverter cooling unit 4 is connected through the first switch module 44. The switch module 43 is connected to the main evaporator 3 in the refrigeration system of the air-conditioning unit; the temperature detection unit is used to detect the temperature of the refrigerant in the inverter cooling unit 4 and send it to the control unit, and the control unit contr...

Embodiment 2

[0052] The difference between this embodiment and the first embodiment is only that: figure 2 As shown, the number of the first switch modules 43 and the second switch modules 44 is plural and corresponds to each cooling branch 411 one-to-one. Each first switch module 43 is located on the cooling branch 411 corresponding to the outlet end of the cooler 412, The second switch module 44 is located on the cooling branch 411 corresponding to the inlet end of the cooler 412 . Each cooling branch 411 is provided with a first switch module 43 and a second switch module 44, which can independently adjust each cooling branch 411, improve the temperature uniformity of the cooler 412, and realize differential adjustment, which is suitable for The loss of each cooling branch 411 has a certain difference (for example, the heat dissipation of the power device is different). Other undescribed contents are the same as those in the first embodiment, and are not repeated here.

Embodiment 3

[0054] The difference between this embodiment and the first embodiment is only that: image 3 As shown, the refrigeration system further includes a flasher 6, a first switch 7 and a second switch 8, and the throttle unit 5 further includes a second throttle element 502 and a third throttle element 503. The condenser 2 passes through the flasher. The compressor 6 is connected to the main evaporator 3, the first throttle element 501 is located between the condenser 2 and the flasher 6, the second throttle element 502 is located between the compressor 11 and the flasher 6, and the third throttle element 503 is located between the flasher 6 and the main evaporator 3, the outlet end of the inverter cooling unit 4 is connected to the flasher 6 through the first switch 7, and is connected to the main evaporator 3 through the second switch 8; A switch 7 is interlocked with the second switch 8 to ensure that only one switch is turned on during operation. The above-mentioned first swit...

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Abstract

The invention discloses a frequency converter thermal management system for an air conditioner unit, an air conditioner unit and a control method, which specifically include a control unit, a temperature detection unit, a frequency converter cooling unit, a first switch module and a second switch module, wherein the control units are respectively It is connected with the temperature detection unit, the first switch module and the second switch module; the inlet end of the inverter cooling unit is connected to the condenser in the refrigeration system of the air conditioner unit through the second switch module, and the inverter cooling unit is connected to the condenser in the refrigeration system. The outlet end is connected to the main evaporator in the refrigeration system of the air-conditioning unit through the first switch module; the temperature detection unit is used to detect the temperature of the refrigerant in the inverter cooling unit and send it to the control unit, and the control unit according to The detected temperature controls the opening value of the first switch module and the second switch module, so as to maintain the refrigerant in the inverter cooling unit within a preset range. The above scheme has the advantages of precise temperature control and strong applicability.

Description

technical field [0001] The invention mainly relates to the technical field of power electronic thermal management, in particular to a frequency converter thermal management system of an air-conditioning unit, an air-conditioning unit and a control method. Background technique [0002] The frequency conversion of refrigeration and heat pump units has stronger working condition adjustment ability, which is an effective measure to improve the unit's ability to adjust. The frequency conversion of central air conditioners has become an industry trend. The inverter of the unit adopts refrigerant cooling, which has the advantages of high efficiency, simplicity, cleanliness, strong economy and convenient maintenance. However, the thermal management of the inverter is also more complex, requiring a better thermal management system. [0003] The thermal management load inside the inverter of refrigeration and heat pump units is usually divided into two parts, one part is the heat of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/64F24F11/84F24F11/83
CPCF24F11/64F24F11/84F24F11/83
Inventor 马明王春燕杨磊张志敏韩志成奥恩王幸智曾云峰梁好玉
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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