JPH08170851A - Transmission device for air conditioning apparatus - Google Patents

Abstract

PURPOSE: To enable centralized control of a plurality of control systems with one centralized controller without complicating wiring of an air conditioning system in total. CONSTITUTION: A plurality of control systems 8A-8D are so arranged to have outdoor control units 5 and room control units 6 being to transmit or receive signals by internal and external communication signal lines 7. The outdoor control units 5, 5... of the control systems 8A-8D are connected mutually to a centralized control signal line 10 through a relay switch and a centralized controller 9 is connected to the centralized control signal line 10. In the setting of addresses for internal and external units 3, 3... and 4, 4..., with ON/OFF operation of the relay switch, units to which the control units are connected are switched one by one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device for an air conditioner, and more particularly, it enables operation control by transmitting and receiving signals between an outdoor unit and an indoor unit and centralized control of the entire system by a centralized controller. To the improved transmission system.

[0002]

2. Description of the Related Art Conventionally, as an example of an air conditioner,
As disclosed in JP-A-59-210249, an outdoor unit and an indoor unit are connected by a refrigerant pipe, and an outdoor control unit for controlling the outdoor unit and an indoor control unit for controlling the indoor unit are provided. It is known that an internal / external system is provided, which is connected by an internal / external communication signal line and is configured to exchange various control signals such as an operation signal and a mode signal between the units.

Further, this internal / external system is provided with a centralized controller for centrally controlling each of the internal and external units, and the centralized controller and the outdoor control unit are connected by a centralized signal line to enable transmission / reception of a centralized control signal. .
Then, the central control signal transmitted from the central controller is once received by the microcomputer of the outdoor control unit, the outdoor unit is controlled based on the received central control signal, and the central control signal is transmitted from the microcomputer to the indoor control. The indoor unit is transmitted to the unit, and the indoor unit is controlled based on the centralized control signal, so that the internal and external units are centrally controlled.

[0004]

However, in such a configuration, when a plurality of internal and external systems are arranged and the entire air conditioning system constituted by the plurality of internal and external systems is to be centrally controlled by a single centralized controller. , A plurality of centralized control signal lines for individually connecting the centralized controller and each internal and external system are required. For this reason, the wiring of the entire system becomes complicated, which complicates the wiring work and increases the possibility of erroneous wiring.
When such miswiring occurs, normal communication operation cannot be performed, and such a wiring structure has a problem that the reliability of the entire air conditioning system is low.

The present invention has been made in view of these points, and makes it possible to centrally control a plurality of internal and external transmission systems by a single centralized controller without inviting complicated wiring in the entire system. The purpose is to

[0006]

In order to achieve the above object, the present invention relates to a transmission system having an internal and external communication path between an internal and external control unit, the internal and external communication path serving as a centralized communication path. In order to achieve the above, the internal and external communication paths and the centralized communication path connecting between the outdoor control units are configured as one transmission system to enable transmission and reception.

Specifically, as shown in FIG. 1, the invention according to claim 1 uses a heat source side control unit (5) for controlling the heat source side unit (3) and a utilization side unit (4) for controlling the utilization side unit (4). The internal / external transmission system (8A, 8B, 8C, 8C) that is connected to the side control unit (6) by the own system communication path (7) so that signals can be transmitted and received.
Have multiple D). Then, the heat source side unit (3,
3, ...) and the central control unit (9) for centrally controlling the use side units (4,4, ...), and each internal / external transmission system (8A, 8B, 8C, 8)
D) heat source side control units (5, 5, ...) are connected to each other so that signals can be transmitted and received, and each internal / external transmission system (8A) is connected via the heat source side control unit (5) and the own system communication path (7). , 8B, 8C, 8D)
, And a centralized communication path (10) capable of transmitting and receiving signals to and from the user side control unit (6, 6, ...).

According to a second aspect of the present invention, in the air conditioner transmission device according to the first aspect, a signal is provided between the heat source side control unit (5) and the central communication path (10). The communication path cutoff means (28) for cutting off the transmission and reception of is provided.

According to a third aspect of the present invention, in the transmission device of the air conditioner according to the second aspect, the communication path blocking means (2
When the signal is transmitted / received only between the heat source side control unit (5) and the user side control unit (6) within the same internal / external transmission system (8A, 8B, 8C, 8D), the heat source side control is performed. unit
Transmission and reception of signals between (5) and the centralized communication path (10) are blocked.

According to a fourth aspect of the present invention, in the air conditioner transmission device according to the third aspect, the heat source side control unit (5) includes a heat source in another internal / external transmission system (8A, 8B, 8C, 8D). When a signal is transmitted / received only between the side control unit (5) and the user side control unit (6), a miswiring detection signal is transmitted to the own system communication path (7) when the signal is received. The configuration is such that the incorrect wiring recognition means (31) is provided.

The invention according to claim 5 is the above claim 2, 3
Alternatively, in the air conditioner according to the fourth aspect, the communication path blocking means
(28) is composed of relays (28a, 28b).

According to a sixth aspect of the present invention, in the air conditioner transmission device according to the fifth aspect, the centralized communication path (10) comprises two transmission lines (10a, 10b) each for transmitting a control signal. However, the relays (28a, 28b) are provided so as to be opened and closed in synchronization with each of the two transmission lines (10a, 10b).

[0013]

With the above construction, the present invention provides the following actions. According to the first aspect of the present invention, during operation of the air conditioner, a control signal is transmitted and received between the heat source side control unit (5) and the use side control unit (6) through the own system communication path (7), and this control is performed. The heat source side units (3, 3, ...) And the use side units (4, 4, ...) Are controlled based on the signal. Also, each heat source side unit (3,3, ...) And each use side unit (4,4, ...) Are centralized by the centralized control signal transmitted from the centralized control unit (9) through the centralized communication path (10). Controlled.

Since the centralized control signal can be transmitted to the user side control unit (6) through the heat source side control unit (5) and the own system communication path (7), the centralized control unit (9) There is no need for multiple centralized control signal lines that individually connect each of the internal and external transmission systems (8A to 8D), and the centralized control unit (9) can be installed in the local system communication path (7) or the centralized communication path (10). It is possible to realize wiring that enables centralized control of all units simply by connecting (). Therefore, the wiring of the entire system can be simplified.

Further, with such a wiring structure, since the local system communication path (7) and the centralized communication path (10) can be obtained as one continuous transmission line, the centralized control unit (9)
There is no restriction on the connection position of.

In the inventions according to claims 2 to 4, the transmission / reception of signals between the heat source side control unit (5) and the centralized communication path (10) is switched by the operation of the communication path blocking means (28).
Therefore, when setting an address for each unit during construction of the device, the communication path blocking means (28) connects or disconnects the own system communication path (7) and the centralized communication path (10). As a result, the address setting operation can be performed while switching the partner unit that can transmit / receive to / from each unit (5, 6). Therefore, unlike the prior art, the work of manually setting the address of each unit by an operator is not required, and the address can be set only by transmitting and receiving signals between the units.

Further, when disconnection or the like occurs in each of the communication paths (7) and (10) and a communication abnormality occurs, the communication path blocking means (28) is operated to stop the function of the entire system. It can be avoided. That is, for example, when a communication error occurs in the own system communication path (7), the heat source side control unit (5) of the internal / external transmission system (8A) in which the own system communication path (7) exists Communication path blocking means (2
If the (8) is turned off, the normal internal / external transmission system (8B ~ 8D) is disconnected by disconnecting the internal / external transmission system (8A) where this communication error occurs from other normal internal / external transmission system (8B ~ 8D).
It is possible to secure good communication status in 8D).

On the other hand, when a communication abnormality occurs in the centralized communication path (10), if all the communication path interruption means (28) of each internal and external transmission system (8A to 8D) are turned off, the centralized control unit ( It becomes impossible to transmit / receive between 9) and each internal / external transmission system (8A-8D), and it is possible to communicate only by the own system communication path (7).

Further, in particular, in the invention described in claim 4, erroneous wiring can be detected by utilizing the operation of the communication path blocking means (28). In other words, internal / external transmission system (8A, 8B, 8C, 8D)
In heat source side control unit (5) and user side control unit
(6) When only transmitting / receiving signals to / from (6), shut off the communication path blocking means (28) provided in the internal / external transmission system (8A, 8B, 8C, 8D) that is transmitting / receiving. Leave it in a state,
This signal shall not be transmitted to other internal and external transmission systems (8A, 8B, 8C, 8D). Nevertheless, when this signal is transmitted to other internal / external transmission systems (8A, 8B, 8C, 8D), the error on the heat source side control unit (5) that received the signal was The wiring recognizing means (31) recognizes the incorrect wiring and sends an incorrect wiring detection signal to the own system communication path (7). As a result, incorrect wiring can be accurately detected.

According to a fifth aspect of the invention, the communication path cutoff means.
By using the relays (28a, 28b) for (28), only one set of interfaces, which is a connecting portion to the centralized communication path (10) in the heat source side control unit (5), is required, and the configuration is simplified. In addition, there is little power loss when the switch is connected, and it is unlikely to be affected by disturbance due to noise.

In the invention according to claim 6, the centralized communication path (10)
Is transmitted by the control signal transmitted from each of the two transmission lines (10a, 10b). Then, when the centralized communication path (10) is cut off by the communication path cutoff means (28), the relays (28a, 28b) are synchronously opened. Therefore, the balance between both transmission lines (10a, 10b) is maintained and the reliability of the system is secured.

[0022]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 2 shows a transmission system control system of the air conditioner (1) according to this example. The air conditioner (1) is provided with a plurality of refrigerant circulation units (2A, 2B, 2C, 2D), and the refrigerant circulation units (2A, 2B, 2C, 2D) are configured in four systems in FIG. This four-system refrigerant circulation unit (2A, 2B, 2C, 2
In D), each indoor unit (3) is connected to four indoor units (4) in parallel with each other.

The outdoor unit (3) is a heat source side unit according to the present invention provided with an outdoor heat exchanger having a compressor, a four-way switching valve, a fan and an outdoor electric expansion valve, which are not shown, while the indoor unit The unit (4) is a use side unit in the present invention provided with an indoor electric expansion valve and an indoor heat exchanger having a fan, and each refrigerant circulation unit (2A, 2B, 2C, 2D)
Has a variable refrigerant flow direction in the cooling operation mode and the heating operation mode.

The outdoor unit (3) is provided with an outdoor control unit (5) as a heat source side control unit in the present invention, while the indoor unit (4) is used as a use side control unit in the present invention. It is equipped with an indoor control unit (6). Then, each control unit (5, 6) in the same refrigerant circulation unit (2A, 2B, 2C, 2D), the internal and external communication signal line that constitutes the own system communication path in the present invention to be able to exchange control signals with each other ( 7) connected by a refrigerant circulation unit (2A, 2B, 2
The control system (8A, 8B, 8C, 8D) is constructed as four internal and external transmission systems corresponding to C, 2D). As a result, the air conditioning operation is controlled for each control system (8A, 8B, 8C, 8D).

Further, each outdoor control unit (5, 5, ...) Is a centralized controller as a centralized control unit in the present invention.
The central control signal line (10) forming a central communication path is connected to (9), and the control signal from the central controller (9) is transmitted to this central control signal line (10) and each internal and external communication signal line.
(7,7, ...) is transmitted to each outdoor control unit (5,5, ...) and each indoor control unit (6,6, ...), and each unit (3,3, ..., 4,4, ...) ) Is controlled comprehensively (centralized control).

In addition, in each of the indoor units (4),
A remote control (11) is connected, and control signals such as set temperature are exchanged between this remote control (11) and the indoor control unit (6) to individually control each indoor unit (4, 4, ...).
It is controlled by (11).

Further, (12, 12, ...) In this FIG.
It is an ON / OFF controller that sends operation and stop control signals to multiple indoor units (4,4, ...) Grouped together, and the indoor units (4,4,4)
...) are controlled collectively.

Further, (13) is a schedule timer, which can set the operation start time and the stop time for each of the plurality of indoor units (4, 4, ...) For example, on a weekly basis. It is like this.

Next, the circuit configuration of the control unit for exchanging control signals will be described. The outdoor control unit (5), indoor control unit (6) and centralized controller
As the transmission method between (9), the balanced communication method is adopted as the AMI communication method, and is configured to perform half-duplex signal transmission with a preset polarity.

As shown in FIG. 3, the outdoor control unit (5) includes a transmitter circuit (20), a receiver circuit (21) and a polarity judgment circuit (2).
2) and the transmission circuit (20), the reception circuit (21) and the polarity determination circuit (22) are connected to the microcomputer (30). Further, the indoor control unit (6) and the centralized controller (9) are
The transmission circuit (2
0), a receiving circuit (21) and a polarity determining circuit (22) are provided. Here, in particular, the circuit configuration will be described taking the outdoor control unit (5) as an example. In addition, the internal and external communication signal line (7)
The centralized control signal line (10) is composed of a positive signal line (7a, 10a) and a negative signal line (7b, 10b) as transmission lines, respectively.

The transmission circuit (20) transmits an information signal to the internal / external communication signal line (7) and the centralized control signal line (10) according to the output signal from the microcomputer (30). 20a, 20b), and the positive side signal line (7a, 10a) and negative side signal line of the above-mentioned internal and external communication signal line (7) and centralized control signal line (10)
Connect each driver (2) to the common wiring (23, 24) connected to (7b, 10b).
0a, 20b) are connected via coupling wiring (20c, 20d). Further, capacitors (20e, 20f) for removing a direct current component are connected to the coupling wirings (20c, 20d).

The receiving circuit (21) has a common wiring (23,
24) via coupling wiring (21a, 21b) and is configured to receive the information signal on the internal / external communication signal line (7) and the centralized control signal line (10) and output it to the microcomputer (30). ing.

Further, the polarity judgment circuit (22) has a common wiring.
It is connected to the positive side signal line (7a, 10a) and the negative side signal line (7b, 10b) of the internal and external communication signal line (7) and the centralized control signal line (10) via (23, 24), and The polarity of the internal / external communication signal line (7) and the centralized control signal line (10) is judged, and the polarity judgment circuit (22)
The driver (20) of the transmitter circuit (20)
a, 20b) makes it possible to invert the information signal to be transmitted.

In the internal / external communication signal line (7) and the centralized control signal line (10), the DC superimposing circuit (25) is the first switching circuit (26).
Connected through. This DC superimposing circuit (25) is connected to the positive signal line (7, 10) of each communication line (7, 10) via the power supply line (25a, 25b).
a, 10a) and the negative signal line (7b, 10b) connected to the DC power supply (2
7), and the DC power supply (27) is connected to both signal lines (7,1).
A predetermined DC voltage, for example, a DC voltage of + 15V is applied to (0).

Further, the first switching circuit (26) is provided for each power line.
Two relay switches (26a, 26b) provided on (25a, 25b)
b) and is configured to open and close both the relay switches (26a, 26b) to connect and disconnect the DC superimposing circuit (25) and each communication line (7, 10).

Both of the relay switches (26a, 26b) are opened and closed under the control of the microcomputer (30). In the preset outdoor control unit (5), the relay switches (26a, 26b) Is closed and the DC superposition circuit (2
When 5) and each communication line (7, 10) are conducted, this DC voltage is superimposed. That is, for example, the DC superimposing circuit (25) of the outdoor control unit (5) set to the address "A" is set to apply the DC voltage to each signal line (7, 10), and the other outdoor control unit (5) In 5), the relay switches (26a, 26b) are opened (OFF).

The power supply lines (25a, 25b) are provided with terminating resistors (25c, 25d) and both power supply lines (25a, 25b).
Between them, connect a capacitor so that it is in parallel with the DC power supply (27).
(25e) is connected. The above terminating resistors (25c, 25d) are
The purpose of this is to suppress the generation of signal waveform distortion in each signal line (7, 10). The capacitor (25e) holds the impedance of each signal line (7, 10) at a predetermined low value.

As one of the features of this embodiment, the centralized control signal line (10) is provided with a second switching circuit (28) as a communication path breaking means. This second switching circuit (28)
Two relay switches installed on the central control signal line (10)
(28a, 28b), each circuit (20, 21, 22) by opening and closing both relay switches (28a, 28b) under the control of the microcomputer (30).
And the signal lines (10a, 10b) are electrically connected and disconnected. And both relay switches (28a, 28
b) is closed under normal transmission conditions, and is used for address setting for each unit (3, 4) after system installation, for example, for internal / external communication signal line (7) or central control signal line.
The microcomputer (30) controls the opening and closing only when a short circuit occurs in (10).

Next, the address setting operation at the time of construction of this system will be described. This address setting operation is a power supply master unit determination operation for determining one of the plurality of outdoor units (3, 3, ...) as an outdoor unit for transmission power supply (hereinafter referred to as power supply master unit). A control address setting operation for setting an address number for each unit and a system address recognition operation for causing each unit to recognize an address number in its own system are sequentially performed. Hereinafter, each operation will be described.

-Power Supply Master Unit Determining Operation-First, the power supply master unit determining operation will be described. In this operation, the relay switch (28a, 28b) of the second switching circuit (28)
By turning on, the centralized control signal line (10) enables transmission and reception of signals between the outdoor control units (5, 5, ...). Then, in this state, the manufacturing serial number assigned at the time of manufacturing in each of the plurality of outdoor units (3,3, ...) Is transmitted and received between the outdoor control units (5,5, ...), and the CSMA / CD (carrier The power supply master unit is determined by the serial number conflict by the detection multiple access / collision detection method. Specifically, the one having the smallest serial number to be transmitted / received is the power supply master unit. In other words, when the outdoor unit (3) receives a serial number smaller than its own serial number, the outdoor unit (3) stops transmitting the serial number thereafter and the outdoor unit (hereinafter referred to as the outdoor unit) that receives power from the power supply master unit. , Called a power supply slave). In this way, only the one outdoor unit (3) with the smallest serial number that finally survived becomes the power supply master unit, and all other outdoor units (3, 3, ...) Become the power supply slave units. Then, in the normal transmission state, the power supply master unit determined in this way always has the first switching circuit (26).
The relay switches (26a, 26b) are turned on, and a DC voltage is applied to each signal line (7, 10) by the DC superimposing circuit (25).

In addition to the power supply master unit determining operation due to such serial number conflict, each outdoor control unit
When the forced parent device setting button is provided on the printed circuit board of (5, 5, ...) and the operator pushes it to forcibly set the outdoor unit (3) as the power supply parent device. There is also. In this case, the power supply master unit transmits a master unit determination operation code (hereinafter, abbreviated as parent determination OPC) to each outdoor control unit (5, 5, ...), and the outdoor unit that receives this parent determination OPC ( 3,3, ...) are forcibly selected as power supply slave units.

Further, not only is such an outdoor unit (3) set as a power supply device, but a centralized controller (9) is provided with a DC superimposing circuit (25) to supply power to this centralized controller (9). It can also be made to have a function as an equipment. In this case as well, the parent-determined OPC is transferred from the central controller (9) to each outdoor control unit (5, 5, ...)
Will be sent to.

-Control Address Setting Operation- Next, the control address setting operation will be described. In this operation, first, one of the plurality of outdoor units (3,3, ...) Is assigned a control address number for each unit (3,3 ,.
An outdoor unit (hereinafter,
Address setting master unit). In this operation, the address setting master device is determined in the same manner as the power supply master device determining operation due to the serial number conflict described above. The address setting master unit determined by this operation is the indoor unit (4,4, ...) and the outdoor unit (3,3, ...).
A different control address number is set for each.

This operation will be described in detail with reference to FIG. 4 (only two control systems are shown in FIG. 4 for the sake of easy understanding). As shown in this figure, two outdoor units (3a, 3a, If the outdoor unit (3a) located on the left side is determined to be the address setting master unit due to a serial number conflict using the centralized control signal line (10) in 3b), the address setting master unit (3a) The indoor control address numbers (indicated by numbers 1 to 4 in FIG. 4 for simplification of description) are assigned to the indoor units (4a, 4b, 4c, 4d). After that, the address setting master device (3a) addresses the outdoor control units (3a, 3b) including itself (for the sake of simplification of explanation, A and B). Sort out. By this operation, all indoor units (4a,
4b, 4c, 4d) and all outdoor units (3a, 3b) have different control address numbers.

-System Address Recognition Operation-Next, a system address recognition operation for recognizing a control address for each control system will be described. In this operation, the second
Set the relay switches (28a, 28b) of the open / close circuit (28) to the OFF state to control each outdoor control unit (5,
5, ...) Disables the transmission and reception of signals between the outdoor control unit (5) and the indoor control unit via the internal and external communication signal line (7).
(6) Enables signal transmission / reception only between and. Then, in this state, the outdoor control unit (5) and the indoor control unit (6) are made to recognize the address number of the partner unit to which they are connected by transmitting and receiving a signal through the internal and external communication signal line (7).

This operation will be described in detail with reference to FIG. 4. From the outdoor unit (3a) having the address number "A" to the indoor units having the address numbers "1" and "2".
For (4a, 4b), the internal and external communication signal line (7
The address signal is transmitted by c), and each indoor unit (4a, 4b) recognizes that the address number of the connected outdoor unit (3a) is "A". This allows
The indoor unit (4a) with the address number "1" recognizes the connected outdoor address number "A" in addition to its own address number "1". On the other hand, the indoor unit with address number "2" (4b)
Even in this case, in addition to the self-address number "2", the address number "A" outside the connected room is recognized. After that, the outdoor unit (3a) with the address number "A" reads the address data of each indoor control unit (4a, 4b) connected by the internal and external communication signal line (7c), and the address numbers "1" and "2". It recognizes that the indoor unit (4a, 4a) is connected. This operation is performed by connecting another control system (the outdoor unit (3b) having the address number "B" and the indoor units (4c, 4d) having the address numbers "3" and "4" to each other. Control system), each of which recognizes the address number of the partner unit.

In this system address recognition operation, the address number of the partner unit is recognized for each control system (8A to 8D) by using the control address, but this control address is different from A system address may be set, and the address number of the partner unit may be recognized for each control system (8A to 8D) by this system address.

The address setting operation is completed by such a series of operations. Then, at the start of operation of the air conditioner, only the power supply master unit turns on the relay switches (26a, 26b) of the first switching circuit (26), and the DC superimposing circuit (25) and each communication line (7, 10). ) And the DC voltage is applied to each communication line (7,10).
Superimposed on top. On the other hand, in all the power supply slave units, the relay switches (26a, 26b) of the first switching circuit (26) are in the OFF state. In addition, the relay switches (28a, 28b) of the second switching circuit (28) of all outdoor control units (5, 5, ...) are turned on, and the central control signal line (10) and the internal / external communication signal line (7) And are connected, and the centralized controller (9) of each device can perform centralized control. In this way, it is possible to send and receive control signals within the local system via the internal / external communication signal line (7), and send / receive centralized control signals for the entire system via the internal / external communication signal line (7) and centralized control signal line (10). The air conditioner is operated while being performed.

As described above, according to the configuration of this example, the entire air conditioning system including a plurality of control systems (8A to 8D)
Even when centralized control is performed by a single centralized controller (9), there is no need for a plurality of centralized control signal lines that individually connect the centralized controller and each control system as in the conventional case. Therefore, the outdoor control unit (5,5
…) Centralized controller (9) on the signal line (10) that connects them
It is possible to realize wiring that enables centralized control of all units simply by connecting them, and it is possible to simplify the wiring of the entire system,
This simplifies the wiring work. For this reason, it is possible to reduce the possibility of erroneous wiring and improve the reliability of the entire air conditioning system. That is, according to the configuration of this example, a plurality of control systems (8A, 8B, 8C, 8D) can be provided without complicating the wiring of the entire system.
Can be controlled centrally by a single centralized controller (9).

Further, with such a wiring structure, since the internal / external communication signal line (7) and the centralized control signal line (10) can be obtained as one continuous transmission line, the centralized controller (9) There is no restriction on the connection position of. That is,
The centralized controller (9) described above is a centralized control signal line (10).
Although connected to the internal communication signal line (7), a centralized control signal can be transmitted to the entire system without interposing a microcomputer or the like (see the virtual line in FIG. 2). Therefore, it is possible to improve the degree of freedom of the installation location of the centralized controller (9) and simplify the connection work of the centralized controller (9). Further, since the internal / external communication signal line (7) in this example is wired along the refrigerant pipe, this wiring work can be easily and definitely performed.

Further, in this example, a second switching circuit (28) is provided between the outdoor control unit (5) and the centralized control signal line (10) so that transmission and reception of signals between them can be blocked. Therefore, the effects described below are also exhibited. That is, as described in the address setting operation described above, the second switching circuit
The open / close operation of (28) can connect or disconnect the internal / external communication signal line (7) and the central control signal line (10), which enables transmission / reception to / from each unit (5, 6). The address setting operation can be performed while switching the partner unit. Therefore, unlike the prior art, the work of manually setting the address of each unit by an operator is not required, and the address can be set only by transmitting and receiving signals between the units. That is, so-called automatic addressing can be realized, and address setting can be performed easily and accurately in a short time.

Further, as an effect of providing the second switching circuit (28), when the signal line (7), (10) is broken and communication abnormality occurs, the second switching circuit (28) is provided. By switching the ON / OFF state of the relay switch (28a, 28b) of (28), it is possible to avoid that the function of the entire system is stopped. In other words, when a communication error occurs in the internal / external communication signal line (7), the second switching circuit (28) of the outdoor control unit (5) provided in the control system in which the internal / external communication signal line (7) exists Turn off the relay switches (28a, 28b) of. In other words, by disconnecting the control system in which this communication abnormality has occurred from other normal control systems, a good communication state between these normal control systems is ensured, and a normal operating state is secured. The function of the entire system can be prevented from being stopped, and the reliability of the system can be ensured.

On the other hand, when the communication abnormality occurs in the central control signal line (10), all the relay switches (28a, 28b) of each control system are turned off, and the central controller is turned on.
Transmission / reception between (9) and each control system (8A, 8B, 8C, 8D) is disabled, and communication is performed only by the internal / external communication signal line (7), that is, transmission / reception only within the own system. This also
It is possible to avoid stopping the function of the entire system,
The reliability of the system can be secured.

-Wrong Wiring Detecting Operation-Next, the erroneous wiring detecting operation in the case where an erroneous wiring occurs in the wiring state in the present air conditioning system will be described. In particular, this example describes the operation to detect miswiring in which the internal and external communication signal line (7) and the centralized control signal line (10) are directly connected without going through the outdoor control unit (5). To do. Specifically, referring to FIG. 5, in the figure, in the middle of the internal / external communication signal line (7c) of the control system (8A) having the outdoor unit (3a) whose address number is “A”, the address number is Control system (8) with outdoor unit (3b) that is "B"
The central control signal line (10) extending from (B) is connected to the outdoor control unit (5
A case will be described in which miswiring that is directly connected without passing through a) is performed during the system address recognition operation described above.

During such an operation, each outdoor unit (3a, 3b) has its own indoor unit (4a, 4b, 4c, 4d).
The second switching circuit when sending the address signal only to
(28) is turned off to prevent the address signal for its own system from being transmitted to the indoor control unit of another control system, and the second switching circuit (28) is turned on in other cases.

Further, each outdoor control unit (5a, 5b) is provided with erroneous wiring recognition means (31a, 31b), and when an address signal for its own system is received from another system, an internal / external communication signal is received. Indoor units (4a, 7c, 7d) connected by wires (4a,
4b, 4c, 4d) is configured to send an incorrect wiring detection signal.

When an address signal is transmitted from the outdoor unit (3a) whose address number is "A" to the indoor units (4a, 4b) of its own system in the above-mentioned miswiring state, the signal is Not only the indoor units (4a, 4b) of its own system, but also the outdoor unit (3b) whose address number is "B" is transmitted by the central control signal line (10) (Fig. 5).
Arrow)). The outdoor unit (3b) whose address number is "B" is not transmitting, so the second switching circuit (2
8) is in the ON state, and this control signal has the address numbers “3” and “4” via the outdoor control unit (5b) of the outdoor unit (3b) having the address number “B”. It will be sent to the indoor unit (4c, 4d).

In this example, the outdoor control unit (3b)
The miswiring recognition means (31b) provided in the unit detects that an address signal of another system is received, and the internal / external communication signal line (7) and the centralized control signal line (10) pass through the outdoor control unit (5). Recognizing that there is a miswiring that is directly connected without any error, the miswiring recognition code is transmitted to the indoor unit (4c, 4d) via the internal / external communication signal line (7d).
As a result, in the state shown in FIG. 5, the miswiring recognition code is transmitted from the outdoor unit (3b) having the address number "B" to the indoor units (4c, 4d) having the address numbers "3" and "4". Will be transmitted, and the incorrect wiring code will be displayed on the remote controller (11c, 11d) connected to each indoor unit (4c, 4d).

Therefore, the erroneous wiring as described above can be surely recognized, and the reliability of the entire air conditioner system can be further improved.

In the present embodiment, there are four refrigerant circulation units (2A, 2B, 2C, 2D), one outdoor unit each.
Although the air conditioning system has been described in which four indoor units (4) are connected to (3), the present invention is not limited to this, one having five or more indoor units (4), or one 5 or more indoor units for each outdoor unit (3)
(4) may be connected to the connected one.

[0061]

As described above, according to the present invention, the following effects are exhibited. According to the invention described in claim 1, the heat source side control units of the internal and external transmission systems are connected to each other by a centralized communication path so that signals can be transmitted and received, and the internal and external terminals are connected via the heat source side control unit and the own system communication path. By enabling the transmission and reception of signals to and from the use side control unit of the transmission system, the own system communication path and the centralized communication path can be configured as one transmission system.
The entire air conditioning system consisting of multiple internal and external transmission systems
Even when centralized control is performed by a single centralized control unit, there is no need for a plurality of centralized control signal lines that individually connect the centralized control unit and each of the internal and external transmission systems, as in the conventional case. Therefore, it is possible to realize wiring that enables centralized control of all units simply by connecting the centralized control unit to the centralized communication path or its own system communication path, and it is possible to simplify the wiring of the entire system. It will be easy. Therefore, the possibility of erroneous wiring can be reduced, and the reliability of the entire air conditioning system can be improved. That is, according to the present invention, a plurality of control systems can be centrally controlled by a single centralized control unit without causing the wiring of the entire air conditioning system to be complicated.

According to the invention described in claims 2 to 4, various effects are exhibited by the operation of the communication path blocking means provided between the heat source side control unit and the centralized communication path. First,
In the case of setting an address to each unit at the time of construction of the apparatus, the address setting operation can be performed by switching the partner unit capable of transmitting / receiving to / from each unit by the operation of the communication path blocking means. Therefore, unlike the prior art, the work of manually setting the address of each unit by an operator is not required, and the address can be set only by transmitting and receiving signals between the units. That is, so-called automatic addressing can be realized, and address setting can be performed easily and accurately in a short time.

Further, when disconnection or the like occurs in each communication path and a communication abnormality occurs, it is possible to avoid stopping the function of the entire system by activating the communication path cutoff means. That is, so-called danger distribution can be performed by disconnecting the part where the communication abnormality occurs from the system by the disconnection operation of the communication path disconnecting means,
It is possible to enable communication only in a portion where normal communication is possible and enable continuous operation thereof.

Further, in particular, according to the invention as set forth in claim 4, in a state in which the transmission is performed only in the inside / outside transmission system by the operation of the communication path cutoff means, the signal is transmitted to another inside / outside transmission system. Equipped with a wrong wiring recognition means for recognizing wrong wiring when it is sent to the heat source side control unit, it is possible to accurately detect wrong wiring and further improve the reliability of the entire air conditioner system. You can

According to the fifth aspect of the invention, since the communication path cutoff means is composed of a relay, a single interface, which is a connection part to the centralized communication path in the heat source side control unit, is sufficient for simplifying the structure. Can be planned.
Further, it is possible to obtain a configuration in which power loss is small when the switches are connected and is less likely to be affected by disturbance due to noise.

According to the sixth aspect of the present invention, the centralized communication path is composed of two transmission lines each for transmitting a control signal,
Since the relays are provided so as to be synchronously opened and closed for each of the two transmission lines, when the centralized communication path is interrupted by the communication path interrupting means, the relays are synchronously opened. The balance of each transmission line is maintained, and the reliability of the system can be secured.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of the present invention.

FIG. 2 is a transmission system control system diagram of the air-conditioning apparatus according to the embodiment.

FIG. 3 is a block circuit diagram of an outdoor control unit.

FIG. 4 is a diagram for explaining an address setting operation.

FIG. 5 is a diagram for explaining an erroneous wiring detection operation.

[Explanation of symbols]

 (1) Air conditioner (3) Outdoor unit (heat source side unit) (4) Indoor unit (use side unit) (5) Outdoor control unit (heat source side control unit) (6) Indoor control unit (use side control unit) (7) Internal and external communication signal lines (local system communication path) (8A to 8D) Control system (internal and external transmission system) (9) Centralized controller (centralized control unit) (10) Centralized control signal line (centralized communication path) (10a) Positive side signal line (transmission line) (10b) Negative side signal line (transmission line) (28) Second switching circuit (communication path breaking means) (28a, 28b) Relay switch (31) Miswiring recognition means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Kamabo 1304 Kanaoka-cho, Sakai City, Osaka Daikin Industries, Ltd.Kanaoka Plant, Sakai Manufacturing Co., Ltd. (72) Osamu Tanaka 1304, Kanaoka-cho, Sakai, Osaka Prefecture Daikin Industries Sakai Plant Kanaoka Factory

Claims (6)

[Claims] 1. A heat source side control unit (5) for controlling the heat source side unit (3) and a user side control unit (6) for controlling the user side unit (4) are signaled by their own system communication path (7). Internal / external transmission system (8A, 8B, 8C,
8D) are provided in plural, and the heat source side unit (3, 3, ...) And the use side unit (4,
Central control unit (9) for centrally controlling (4,…) and heat source side control unit for each internal / external transmission system (8A, 8B, 8C, 8D)
(5,5, ...) are connected so that signals can be transmitted and received, and each internal / external transmission system (8A, 8B, 8C, 8D) is connected via the heat source side control unit (5) and the own system communication path (7). User side control unit (6)
A centralized communication path (10) capable of transmitting and receiving signals to and from the air conditioner. 2. The heat source side control unit (5) and the centralized communication path (1
The transmission device for an air conditioner according to claim 1, characterized in that a communication path blocking means (28) for blocking transmission and reception of a signal between the both is provided between the transmission device and the (0). 3. The communication path breaking means (28) is a signal only between the heat source side control unit (5) and the user side control unit (6) in the same internal / external transmission system (8A, 8B, 8C, 8D). The air conditioner according to claim 2, wherein transmission / reception of signals between the heat source side control unit (5) and the centralized communication path (10) is interrupted when the transmission / reception of the air is performed. Transmission equipment. 4. The heat source side control unit (5) is a heat source side control unit (5) in another internal / external transmission system (8A, 8B, 8C, 8D).
When a signal is transmitted / received only between the user side control unit (6) and the user side control unit (6), an incorrect wiring detection means (31) for transmitting an incorrect wiring detection signal to the own system communication path (7) when the signal is received. The air conditioner transmission device according to claim 3, further comprising: 5. The communication path breaking means (28) is a relay (28a, 28a).
b) according to claim 2,
3. The air conditioner transmission device according to 3 or 4. 6. The centralized communication path (10) comprises two transmission lines (10a, 10b) for transmitting control signals, and a relay (28a, 28b) has two transmission lines (10a, 10b). 6. The transmission device for an air conditioner according to claim 5, wherein the transmission device is provided so as to be opened and closed in synchronization with each of the above.