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Frequency-conversional multi-connected air-conditioning system and control method thereof

A multi-connection and controller technology, applied in the field of multi-connection, can solve the problems of compressor protection shutdown, low refrigerant, and high temperature of the compressor drive circuit board, achieving good heat exchange effect, reducing protection shutdown, and good reliability Effect

Active Publication Date: 2018-06-22
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In actual application, for example, when the indoor units are cooling and heating at the same time, initially four indoor units perform cooling operation, one indoor unit performs heating operation, and then switch to one indoor unit for heating operation, and one indoor unit performs heating operation. If the machine is in cooling operation, there will be less refrigerant entering the heat exchange branch, resulting in poor cooling effect of the cooling heat exchanger on the compressor drive circuit board, and the high temperature of the compressor drive circuit board will affect the reliability of the air conditioner. Sexuality, it is easy to cause the problem of compressor protection shutdown

Method used

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  • Frequency-conversional multi-connected air-conditioning system and control method thereof
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  • Frequency-conversional multi-connected air-conditioning system and control method thereof

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Embodiment 1

[0038] This embodiment is a control method for a frequency conversion multi-connection unit. The frequency conversion multi-connection unit includes an outdoor unit, a plurality of indoor units, and a heat exchange main circuit for connecting the outdoor unit and the plurality of indoor units. The outdoor unit is provided with a compressor. And the outdoor unit includes a first throttling device arranged on the heat exchange main circuit, and a heat exchanging branch connected in parallel with the first throttling device, the heat exchanging branch includes a cooling heat exchanger and a second throttling device, The cooling heat exchanger is used to cool the drive circuit board of the compressor. The control method in this embodiment includes acquiring the temperature of the driving circuit board, and reducing the opening degree of the first throttling device or increasing the opening degree of the second throttling device when the temperature of the driving circuit board sati...

Embodiment 2

[0056] This embodiment is another control method of frequency conversion multi-line, which is similar to the method in Embodiment 1. Similarly, with figure 1 Take the water-cooled multi-connector described in as an example.

[0057] The control method of this embodiment includes acquiring the temperature of the driving circuit board 10, and reducing the opening of the first electronic expansion valve 8 (that is, the first throttling device) when the temperature of the driving circuit board 10 satisfies the first condition, Either increase the opening degree of the second electronic expansion valve 9 (ie, the second throttling device), or decrease the opening degree of the first electronic expansion valve 8 and simultaneously increase the opening degree of the second electronic expansion valve 9 . Wherein, the first condition includes that the temperature of the driving circuit board 10 is greater than the first threshold and less than the second threshold.

[0058] Optionall...

Embodiment 3

[0069] This embodiment is a frequency conversion multi-connection unit, including at least one outdoor unit (there may be one indoor unit or multiple units), multiple indoor units, and a heat exchange main circuit for connecting the outdoor unit and multiple indoor units. The outdoor unit is equipped with a compressor, and the outdoor unit includes a first throttling device arranged on the main heat exchange circuit, and a heat exchange branch connected in parallel with the first throttling device, and the heat exchange branch includes cooling heat exchange and a second throttling device, the cooling heat exchanger is used to cool the drive circuit board of the compressor; it also includes a temperature sensor and a controller, wherein the temperature sensor is arranged on the drive circuit board of the compressor to detect the temperature of the drive circuit board Temperature; the controller is used to obtain the temperature of the driving circuit board from the temperature s...

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Abstract

The invention discloses a frequency-conversional multi-connected air-conditioning system and a control method thereof, and relates to the technical field of multi-connected air-conditioning systems. The frequency-conversional multi-connected air-conditioning system and the control method thereof aim to solve the problem that in the prior art, a compressor is protected and stopped due to the fact that the amount of a refrigerant in a cooler is too small. The frequency-conversional multi-connected air-conditioning system comprises an outdoor unit, a plurality of indoor units and a heat exchangemain loop; the outdoor unit comprises a first throttling device and a heat exchange branch, wherein the first throttling device and the heat exchange branch are arranged on the heat exchange main loop; the heat exchange branch comprises a cooling heat exchanger and a second throttling device; the cooling heat exchanger is used for cooling a driving circuit board of a compressor; a temperature sensor arranged on the driving circuit board of the compressor is further arranged and is used for detecting the temperature of the driving circuit board; a controller used for acquiring the temperature of the driving circuit board from the temperature sensor is further arranged; and under the condition that the temperature meets the first condition, the opening degree of the first throttling device is decreased, and / or the opening degree of the second throttling device is increased. The frequency-conversional multi-connected air-conditioning system is used for providing cooling or heating for a plurality of rooms with variable refrigerant flow.

Description

technical field [0001] The invention relates to the technical field of multi-connectors, in particular to a frequency-variable multi-connector and a control method thereof. Background technique [0002] The frequency conversion multi-line unit consists of at least one outdoor unit, multiple indoor units and a heat exchange circuit connecting the outdoor unit and the indoor unit. The outdoor unit is composed of an outdoor heat exchanger, compressor and other refrigeration accessories, and the indoor unit is composed of a fan and Indoor heat exchanger and other components, and the compressor is equipped with a drive circuit board for frequency conversion. According to the change of indoor load, the outdoor compressor can adjust the flow output of refrigerant through the change of speed to match the demand change of the indoor unit, so that Air conditioning consumes less energy. [0003] In the existing frequency conversion multi-line unit, a heat exchange branch is connected ...

Claims

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Application Information

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IPC IPC(8): F25B13/00F25B29/00F25B31/00F25B41/04F25B41/06F25B49/02F25B41/20F25B41/24F25B41/34
CPCF25B13/00F25B29/003F25B31/006F25B49/02F25B2313/02331F25B2313/02334F25B2313/0231F25B2700/21153F25B2600/2513F25B2500/08F25B41/31F25B41/20Y02B30/70
Inventor 李丛来曹培春左计学杨营孔
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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