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Frequency converter heat management system of air conditioning unit, air conditioning unit and control method

An air-conditioning unit and management system technology, applied in the direction of mechanical equipment, can solve the problems of reducing reliability and economy, increasing system complexity, unfavorable anti-condensation design, etc., to improve cooling reliability, improve reliability, The effect of expanding the working temperature zone

Active Publication Date: 2021-03-09
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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  • Frequency converter heat management system of air conditioning unit, air conditioning unit and control method
  • Frequency converter heat management system of air conditioning unit, air conditioning unit and control method
  • Frequency converter heat management system of air conditioning unit, air conditioning unit and control method

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Embodiment 1

[0036] Such as figure 1 As shown, the inverter thermal management system of the air conditioning unit in this embodiment includes a control unit, a temperature detection unit, an inverter cooling unit 4, a first switch module 43 and a second switch module 44, the control unit is connected with the temperature detection unit, The first switch module 43 is connected with the second switch module 44; the inlet end of the frequency converter 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 frequency converter 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 controls the f...

Embodiment 2

[0052] The only difference between this embodiment and Embodiment 1 is: figure 2 As shown, the number of the first switch module 43 and the second switch module 44 is multiple and corresponds to each cooling branch 411 one by one, each first switch module 43 is located on the cooling branch 411 corresponding to the outlet end of the cooler 412, and each 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 equipped 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. It is suitable for There is a certain difference in the loss of each cooling branch 411 (for example, the heat dissipation of the power devices is different). Other contents not described are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0054] The only difference between this embodiment and Embodiment 1 is: image 3 As shown, the refrigeration system also includes a flasher 6, a first switch 7 and a second switch 8, the throttling unit 5 also includes a second throttling element 502 and a third throttling element 503, and the condenser 2 passes the flash The main evaporator 6 is connected to the main evaporator 3, the first throttling element 501 is located between the condenser 2 and the flasher 6, the second throttling element 502 is located between the compressor 11 and the flasher 6, and the third throttling element 503 is located between the flasher 6 and the main evaporator 3, the outlet of the inverter cooling unit 4 is connected to the flasher 6 through the first switch 7, and connected to the main evaporator 3 through the second switch 8; One switch 7 is interlocked with the second switch 8 to ensure that only one switch is turned on during operation. The above-mentioned first switch 7 and the secon...

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Abstract

The invention discloses a frequency converter heat management system of an air conditioning unit, the air conditioning unit and a control method. The frequency converter heat management system specifically comprises a control unit, a temperature detection unit, a frequency converter cooling unit, first switch modules and second switch modules, and the control unit is respectively connected with the temperature detection unit, the first switch modules and the second switch modules; the inlet end of the frequency converter cooling unit is connected to a condenser in an air conditioning unit refrigerating system through the second switch modules, and the outlet end of the frequency converter cooling unit is connected to a main evaporator in the air conditioning unit refrigerating system through the first switch modules; and the temperature detection unit is used for detecting the temperature of a refrigerant in the frequency converter cooling unit and sending the temperature to the control unit, and the control unit controls the opening values of the first switch modules and the second switch modules according to the detected temperature so as to maintain the refrigerant in the frequency converter cooling unit within a preset range. According to the above scheme, the advantages of accurate temperature control, high applicability and the like are achieved.

Description

technical field [0001] The invention mainly relates to the technical field of thermal management of power electronics, 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 a stronger ability to adjust working conditions, and is an effective measure to improve the unit's ability to adjust. Frequency conversion of central air conditioners has become an industry trend. The frequency converter of the unit is cooled by refrigerant, which has the advantages of high efficiency, simplicity, cleanliness, strong economy and convenient maintenance. However, the thermal management of the frequency converter is also more complex, requiring a thermal management system with better performance. [0003] The thermal management load inside the frequency converter of refrigeration and heat pump units is usually...

Claims

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Application Information

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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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