JP2567042B2 - Control device for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention provides an outdoor unit having two compressors for a plurality of indoor units, and installs these compressors from the indoor unit side. The present invention relates to a control device for an air conditioner that operates at the number of operating units and the operating frequency determined according to the required load.

(Prior Art) An outdoor unit provided with two compressors is provided for a plurality of indoor units, and these compressors are operated at the number of operating units and operating frequencies determined according to the load demanded from the indoor unit side. The demand for such air conditioners (hereinafter referred to as "multi-air conditioners") has been steadily increasing in recent years. Here, the required load from the indoor unit side means the absorbed heat amount per unit time (during cooling operation) and the supplied heat amount (heating operation) that are determined according to the difference between the determined temperature in the room and the actual temperature, that is, the temperature deviation. Time) and humidity control amount, etc., and the air conditioning capacity of the air conditioning apparatus is adjusted according to this required load. Here, the adjustment of the air conditioning capacity can be performed by changing the rotation speed of the compressor to adjust the circulation amount of the cooling air circulating in the refrigeration cycle. Therefore, the adjustment of the air conditioning capacity eventually results in adjusting the number of operating compressors and their rotation speeds according to the required load. However,
The adjustment of the rotation speed of the compressor is performed by adjusting the speed of the motor that drives the compressor, and the operating frequency is the rotation speed of the motor that drives the compressor with reference to the frequency of the supply voltage. Corresponds to what is expressed.

(Problems to be Solved by the Invention) When the air conditioner is started in the heating operation mode, it takes a long time for the temperature of the indoor heat exchanger provided as one of the indoor units to rise, and the temperature of the indoor heat exchanger is increased. Even when the temperature reaches a predetermined value and the operation of the indoor fan is started, it takes a considerably longer time until the temperature of the indoor air rises to the predetermined value because the heat capacity of the indoor air is related. Especially when the operating frequency of the compressor provided as an outdoor unit is low,
It is even more difficult for the temperature in the room to rise. Such a state in which the room temperature is unlikely to rise is not preferable from the viewpoint of comfort.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control device for an air conditioner that can raise the room temperature more rapidly when the heating operation is started.

〔The invention's effect〕

(Means for Solving the Problem) In order to achieve the above object, the present invention provides an outdoor unit having two compressors for a plurality of indoor units, and loads these compressors on a load demanded from the indoor unit side. In the control device of the air conditioner that operates at the number of operating units and operating frequency determined according to the above, when starting heating operation, one of the compressors is started for a predetermined time, and then one of the compressors is set to low frequency operation. , The other compressor is started at a relatively high operating frequency for a predetermined time, and both are operated at a low frequency for a predetermined time For a predetermined time after the initial startup of the compressor, the two units are irrespective of the load demanded from the indoor unit side. A rapid heating control means for operating the compressor at a high operating frequency is provided.

(Operation) According to the above configuration, when the heating operation is started, the two compressors are operated at a high operation frequency for a certain period of time after the initial operation of each compressor regardless of the load demanded from the indoor unit side. . That is, when the heating operation is started, the high-performance heating operation is forcibly performed for a certain period of time after the initial startup operation of each compressor regardless of the load demanded from the indoor unit side. With this, regardless of the control mode corresponding to the load demanded from the indoor unit side, the indoor temperature is always raised rapidly,
It is possible to quickly reach a comfortable heating operation temperature and improve comfort.

(Embodiment) FIG. 2 shows an embodiment of the present invention. This embodiment is an embodiment in which a total of 6 indoor units divided into groups of 3 are provided, and two compressors are provided for the indoor units. Room temperature setting means S1, S2, S3, S4, S5, S6 and indoor controllers C1, C for each indoor unit
2, C3, C4, C5, C6 are provided respectively. Each room temperature setting means may be provided in the indoor controller, or may be provided in a remote layer operation remote control device. Each indoor controller compares the set temperature set by the room temperature setting means with the actual room temperature, and outputs a frequency command corresponding to the air conditioning addition required, or the request addition required to reduce the deviation, that is, the temperature deviation. The output signals of the three sets of indoor controllers C1, C2, C3 belonging to the three indoor units of the first group are the first
Group controller G1 of the second group of three indoor units belonging to the three indoor units C4, C5,
The output signal of C6 is input to the second group controller G2. These group controllers G1 and G2 each determine an optimum frequency command as a group based on three frequency commands, and send it to the outdoor controller C0 as the optimum frequency command. This frequency command is performed using the frequency code from S0 to SF based on the hexadecimal display from 0 to F from the frequency zero, that is, the stopped state to the maximum frequency 90 Hz corresponding to the maximum rotation speed of the compressor.

Group controllers G1 and G2 are disclosed in, for example, Japanese Patent Laid-Open No. 59-138.
As disclosed in Japanese Patent No. 41, the optimum frequency is calculated as follows.

First, the number of operating indoor units is confirmed, and the highest frequency (highest frequency) of the three input frequency cargo is confirmed. The maximum frequency to be output corresponding to the maximum frequency confirmed here is stored in the group controller as a table for each indoor unit operating number. For example, the lowest operating frequency of the compressor is 29Hz and the highest operating frequency is
If the maximum input frequency to the group controller is 90 Hz or less and it is 61.3 Hz or less, the value remains unchanged regardless of the number of operating indoor units, and if it exceeds that value, the operating number of indoor units is 3 units. At this time, the value is output as it is, but when the number is two or less, the lower the operating frequency, the lower the maximum frequency is output. For example, if the maximum input frequency is
If it is 90Hz, the maximum output frequency is 3
It outputs 90Hz for one unit, 70Hz for two units, and 50Hz for one unit. In this way, the total capacity of the indoor unit and the capacity of the compressor are harmonized, and overload of the compressor is prevented.

Both group controllers G1 and G2 send a frequency command to the outdoor controller C0 within the range of the above-mentioned maximum frequency. The outdoor controller C0 first determines the number of operating compressors D based on the command frequency from both group controllers G1 and G2.
Is determined, the operating frequency of each compressor is determined according to the result, and each compressor is operated based on the operating frequency. A specific example of how to determine the number of operating compressors and the operating frequency performed by the outdoor controller C0 is shown below.

The frequency value when the frequency code from each group controller G1, G2 is converted to the actual frequency is F (1), F
Then, the sum F (A) of the two is obtained.

F (A) = F (1) + F (2) (1) Based on the value of F (A), the number D of operating compressors is first determined as follows.

When F (A) ≦ 29, D = 1 (2) When F (A)> 29, D = 2 (3) D = 1, that is, when F (A) ≦ 29, only the first compressor The second compressor is not operated. When D = 2, that is, F (A)> 29, both compressors operate.

When operating only one compressor, the operating frequency F (XA) is calculated by further multiplying F (A) obtained by the equation (1) by an appropriate coefficient, for example, 2.7.

F (XA) = F (A) × 2.7 (4) Table 1 shows the relationship between the operating frequency F (XA) and the corresponding frequency code F (V1).

When operating two compressors, each compressor CP1, based on the frequency value F (A) obtained by equation (1)
The operating frequency codes F (V1) and F (V2) of CP2 are determined as shown in Table 2. In this case, F obtained by the equation (1)
When the value of (A) exceeds 90, all are treated as F (A) = 90.

The compressors CP1 and CP2 are driven by motors M1 and M2, respectively, and the motors M1 and M2 are driven by the outputs of inverters V1 and V2 controlled by the outdoor controller C0. Therefore, each compressor is
It will be driven at the rotational speed according to the frequency code of the table or Table 2.

Next, the operation mode of the apparatus of FIG. 2 having the above configuration will be described with reference to the flowchart of FIG. 1 focusing on the operation of the outdoor controller C0 in the case of the heating operation which is the object of the present invention.

The outdoor controller C0 is both group controllers G1 and G2
The number of operating compressors D based on the command frequency from
Is first determined (step 10). The number of operating units D is confirmed (step 11), and if D = 1, the operating frequency of the operating compressor, for example, the compressor CP1 is determined (step 1).
2). Check the frequency determined here (Step 1
3) If it is the above-mentioned frequency of 61.3 Hz or less, it is confirmed whether it is a start (operation start) (step 14), and if it is “start”, the operation mode according to the present invention is executed from step 17 onward. Here, when it is not “start”, when the operating frequency exceeds 61.3 Hz in step 13, and D = in step 11.
In the case of 2, the operating frequencies of the compressors CP1 and CP2 are determined (step 15), and then the compressor determined in step 11 is operated at the inverter output frequency determined in steps 12 and 15 (step 16). Step 13
The frequency threshold of 61.3Hz used in
It is a frequency value for determining whether it is the start-up operation or the steady operation after the start, and when it exceeds 61.3 Hz in step 13, it means that it is in the steady operation state after the start.
Therefore, in this case, after the compressor operation is started in step 16, the process returns to the first step 10 and the steps described above are repeated.

The operation at the time of starting the heating operation, which is performed when the operation is started in step 14, that is, in step 17 and thereafter, will be described with reference to FIG.

First, the timer T1 and the timer T4 are started by starting the heating operation (step 17), and the first compressor CP1 is operated at a high speed of the operating frequency SA (step 1).
8), the setting time of timer T1 is about 40 seconds, timer T1
The set time is the starting time of the heating operation according to the present invention, which is about 5 minutes (300 seconds). After putting the compressor CP1 into high-speed operation, the timer T2 is started by the time-up of the timer T1 (steps 19 and 20), and the first compressor CP1 is set to the low frequency operation of the frequency S3, and the second compressor CP2 is set. Start at a relatively high frequency S9 (step 21). The set time of the timer T2 is about 90 seconds. The timer T3 is started by the time-up of the timer T2 (steps 22 and 23), and the compressor CP2 is also operated at a low frequency like the compressor CP1 (step 24). The set time of timer T3 is about 60 seconds. The operation modes of the compressors CP1 and CP2 so far are the electric system including the motors M1 and M2, and the compressors CP1 and CP2.
This is a starting pattern for putting both compressors CP1 and CP2 into the simultaneous operation state without causing overload in the refrigeration cycle including. By the way, conventionally, the startup pattern ends up to this point, and after that the group controller G1, G2
It was operated in accordance with the frequency command output from. However, according to the present invention, after the timer T3 times out,
Both compressors CP1 and CP2 operate at high frequency SA (step 26). This step 26 is a step for rapidly starting the room temperature when starting the heating operation, and is 5 minutes (= 300 minutes) counted from the start of the timer T1.
(Sec), that is, in this step alone, it is continued for about 300− (4 + 90 + 60) = 110 (sec) (step 27). After this step step 10
Back to the normal operation, both compressors CP1, CP2,
It operates according to the frequency commands SX and SY determined by the outdoor controller C0 according to the frequency commands output from the group controllers G1 and G2.

As described in detail above, in addition to the conventional start-up pattern of starting both compressors without overloading the electric system and refrigeration cycle, the forced high-frequency operation time of both compressors is provided, so that the room temperature at the start of heating operation is increased. The air conditioner can be started up rapidly and the comfort can be further improved.

It should be noted that it is known that the starting pattern of the part where the time is set by the timers T1, T2, T3 is variously different depending on the configuration of the refrigeration cycle or the control method thereof, and the starting pattern described above is merely an example.

In this type of multi-air conditioner, the selection contents of the operation mode in the indoor unit may satisfy the difference.
That is, a situation may occur in which one indoor unit requests heating operation, while another indoor unit requests cooling operation. However, the heating operation and the cooling operation cannot be simultaneously performed in the multi-air conditioner. In order to deal with this situation, the priority operation mode is usually set to the group controller.
If it is stored in G1 and G2 in advance and there is a request for both storage modes, only the request that matches the pre-stored priority operation mode is executed, and the request for the other non-priority operation mode is ignored. I have to.

In consideration of the case where the selection of the operation mode in the indoor unit is different, the operation mode switching means, so that the user can set the priority operation mode as a group,
For example, change the operation mode switch to the group controller
It is better to provide them on G1 and G2 so that the user can visually check the setting contents. In this case, if the non-priority indoor unit is temporarily turned off and the indoor controller of the non-priority indoor unit is automatically reset, The operation can be stopped. Further, by displaying the power failure due to the power-off on the remote control device, it is not necessary to prepare an indoor unit provided with a special non-priority display means.

The above is mainly one group controller G1 or
Although the description has been made in the case where there is a difference in the required operation mode on the side of the plurality of indoor controllers belonging to G2, the same thing can be said between both group controllers G1 and G2. In this case as well, the priority operation mode can be set in advance and the processing can be performed in exactly the same manner as in the above case. In this case, by instructing the non-priority operation mode and thus returning the signal indicating the priority operation to the non-operation group controller, the group controller on the priority operation side sends a signal via the signal line. You can let them know that you are a non-priority aircraft without receiving a call.

〔The invention's effect〕

As described above, according to the present invention, when the heating operation is started, a certain time period after the start-up initial operation of each compressor,
By forcibly performing a high-capacity heating operation regardless of the load demanded from the indoor unit side, the indoor temperature is always raised quickly and quickly regardless of the control mode according to the load demanded from the indoor unit side. It can reach a comfortable heating operation temperature and improve comfort.

[Brief description of drawings]

1 is a flow chart showing the operation mode of the apparatus of FIG. 2, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG.
The figure is a timing chart showing the operation mode at the time of starting the heating operation in the apparatus of FIG. C1, C2, C3, C4, C5, C6 …… Indoor controller, G1, G2 …… Group controller, C0 …… Outdoor controller, V1, V2
...... Inverter, M1, M2 …… Motor, CP1, CP2 …… Compressor.

Front Page Continuation (72) Inventor Yoshinori Murashige 336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Audio & Video Engineering Co., Ltd.

Claims (1)

(57) [Claims] 1. Air for operating an outdoor unit equipped with two compressors for a plurality of indoor units, and operating these compressors at a number of operating units and operating frequencies determined according to a load demanded from the indoor unit side. In the controller of the air conditioner, when starting the heating operation, one compressor is started and after operating for a predetermined time, one compressor is set to low frequency operation and the other compressor is started at a relatively high operating frequency for a predetermined time. After that, quick heating control means is provided for operating the two compressors at a high operating frequency for a predetermined time after the initial startup of the compressor, which operates both at a low frequency for a predetermined time, regardless of the load demanded from the indoor unit side. An air conditioner control device characterized by the above.