Automatic temperature and humidity regulation – Distance-adjusted
Patent
1997-04-09
1998-12-29
Tanner, Harry B.
Automatic temperature and humidity regulation
Distance-adjusted
62175, 165205, F24F 1102
Patent
active
058531238
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a signal transmission/reception device of an air conditioner and particularly relates to improvements of the signal transmission/reception device capable of operation control between a thermal-source-side control unit and a user-side control unit and capable of centralized control through a centralized control unit.
As an example of conventional air conditioners, there is a technique as disclosed in Japanese Patent Application Laid-Open Gazette No. 59-210249, in which an outdoor unit is connected to an indoor unit through refrigerant piping and an outdoor control unit for controlling the outdoor unit is connected to an indoor control unit for controlling the indoor unit through a group communication path. The outdoor control unit and the indoor control unit form one control group in which various kinds of control signals such as an operating signal and a mode signal are transmitted and received.
The control group includes a centralized controller for subjecting the outdoor control unit and the indoor control unit to centralized control. The centralized controller is connected to the outdoor control unit through a centralized communication path so as to be capable of transmission and reception of a centralized control signal therebetween.
A centralized control signal transmitted from the centralized controller is received by a microcomputer of the outdoor control unit so that the outdoor unit is controlled according to the received centralized control signal. Further, the centralized control signal is transmitted from the microcomputer to the indoor control unit so that the indoor unit is controlled according to the centralized control signal. In this way, the outdoor control unit and the indoor control unit are subjected to systematic centralized control.
Problems to be solved
There is a case that a plurality of control groups above-mentioned are arranged and the entire air conditioning system composed of the plurality of control groups is subjected to centralized control through a single centralized controller. This case requires a plurality of centralized communication paths for individual connection between the centralized controller and each of the outdoor units of the control groups, which complicates the interconnection of the entire signal transmission/reception system thereby causing the inconvenience of interconnection work. In addition, the risk of incurring an improper interconnection becomes high.
If such an improper interconnection occurs, normal communicating operation cannot be run. Therefore, the above interconnection layout has a problem of lowering the reliability of the entire signal transmission/reception system.
To cope with this, there is a proposed signal transmission/reception system shown in FIG. 9. This signal transmission/reception system is so composed that control units (c,c, . . . , d,d, . . . ) respectively provided in outdoor units (a,a, . . . ) and indoor units (b,b, . . . ) and a centralized controller (e) are connected in series through a single communication path (f). According to this signal transmission/reception system, the communication path (f) connecting the control units (c,c, . . . , d,d, . . . ) and the centralized controller (e) can be reduced in interconnection length and the interconnection layout can be simplified.
In the above-mentioned signal transmission/reception system of the air conditioner, however, when a short circuit or a break occurs at a part of the communication path (f), communication cannot be established at the part. This results in a communication failure between each of the control units (c,c, . . . , d,d, . . . ) and the centralized controller (e), thereby putting the entire signal transmission/reception system out of function.
The present invention has been made in view of the foregoing problems. An aspect of the present invention has its object of implementing a centralized control of a plurality of control groups through a single centralized control unit without complicating the interconnection of the entire si
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Kamafusa Kouji
Kawakami Hisatoshi
Okano Takashi
Sogabe Masaharu
Tanaka Osamu
Daikin Industries Ltd.
Tanner Harry B.
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