JPS62196543A - Air-conditioning machine - Google Patents

Abstract

PURPOSE:To obtain an air-conditioning machine, capable of being connected to the breakers of various kinds of capacities by effecting simple adjusting work only, by a method wherein a capacity control means, controlling air- conditioning capacity, and a reference current setting means, for setting a reference electric current value changeably, are provided in the air-conditioning machine. CONSTITUTION:When a reference electric current value IB is set by a reference electric current setting means 49, the summarized electric current IT, inputted into an air-conditioning machine, is controlled so as to be less than the reference electric current value IB, therefore, the air-conditioning machine can be connected to the breakers of various kinds of capacities by changing the set value IB of the reference electric current setting means 49. A breaker capacity selecting switch 49 is the reference electric current setting means or a slide switch, determining the upper limit value IB of the summarized electric current detected by a first transformer 32, and is employed to select a value, such as 30A, 40A, 50A or the like for example, properly in the range of capacity of the breaker provided in an electric source line.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to an air conditioner.

(Conventional technology) To supplement the heating capacity of heat pump air conditioners,
Adding an electric heater to each indoor unit is described in, for example, Japanese Patent Publication No. 57-36501 and Japanese Patent Application Laid-Open No. 57-294.
L sea urchin is known as described in Publication No. 6. In each of the above air conditioners, when the current supplied to the compressor increases, the electricity to the electric heater is stopped and the total current value supplied to the air conditioner is reduced to below a certain value, that is, when the breaker Control is performed to keep the capacity below 1.

(Problems to be Solved by the Invention) However, the air conditioner that performs the above control has the following drawbacks. In other words, if the breaker capacity installed in the house is even slightly smaller than the current value required by the above air conditioner, the above air conditioner cannot be used unless construction is done to increase the receiving capacity. This means that installing an air conditioner requires a large amount of construction cost. In particular, in a multi-type air conditioner configured with multiple indoor units connected to one outdoor unit, when all indoor units are operated at full capacity at the same time, that is, when maximum current is input to the air conditioner. Even if the current is low and below the maximum input current value, comfortable air conditioning may be possible by controlling the operation of indoor units by prioritizing them, etc.
It is extremely uneconomical to always have to install a breaker with a capacity greater than the maximum current value.

This invention was made to solve the above-mentioned conventional drawbacks, and its purpose is to provide an air conditioner that can be connected to breakers of various capacities by simply making adjustments. be.

(Means for Solving the Problems) Therefore, in the air conditioner of the present invention, a refrigeration cycle is configured by connecting a plurality of indoor units A to an outdoor unit X having a compressor 1. , as shown in FIG. 1, a total current detection means 32 for detecting the total current IT input to the air conditioner; A capacity control means 55 that controls the air conditioning capacity of l-X and/or indoor unit A, and the reference current value rn.
Reference current setting means 49 for variably setting the reference current setting means 49 are respectively provided.

(Function) In the air conditioner described above, the reference current setting means 49
If the reference current value 1B is set by By changing it, it can be connected to breakers of various capacities.

(Example) Next, regarding a specific example of the air conditioner of this invention,
This will be explained in detail with reference to the drawings.

First, Figure 2 shows the refrigerant piping system of a multi-model air conditioner equipped with four indoor units.
X is the outdoor unit, Δ, B, C, and D are the first to
The fourth indoor unit is shown.

The outdoor unit
In addition, during heating operation, there is a four-way switching valve 2 that switches as shown by the broken line in the figure, and an outdoor heat exchanger 3 that has a blower fan 3a.
A first electric valve 4, which is fully opened during cooling operation and controls the degree of superheating of the refrigerant during heating operation, and a liquid receiver 5 are provided corresponding to each of the indoor units A...D, and are fully opened during cooling operation. It has a total of four second electric valves 6 to 9 that control the degree of superheating of the refrigerant and control the degree of subcooling of the refrigerant during heating operation, and an accumulator 10, and each device 1
10 are connected to each other through refrigerant pipes 11 . . . so that the refrigerant can flow therethrough. Each of the indoor units A to D has an indoor heat exchanger 15 and an electric heater 16 that serves as an auxiliary heat source during heating operation.

The four indoor units A to D are connected to the one outdoor unit X by refrigerant piping, thereby forming a refrigerant circulation circuit 19. That is, during cooling operation, by circulating the refrigerant as shown by the solid line arrows in the figure, the heat absorbed from the room by each indoor heat exchanger 15 is released into the outside air from the outdoor heat exchanger 3, which is repeated to cool each room. On the other hand, during heating operation, the refrigerant is circulated as shown by the broken line arrow in the figure, thereby reversing the heat reception, and when the electric heater 16 is activated, it heats each room with its radiated heat. It has been done so that it can be done. In the figure, 20 is a capillary tube, and by returning the refrigerant in the receiver 5 to the accumulator 10 through this tube 20, the evaporation temperature during the refrigeration cycle can be detected at the outlet of the capillary tube 20. ing. Further, 22 is a high pressure switch that detects the discharge pressure of the refrigerant, 23 is a liquid shutoff valve, and 24 is a gas shutoff valve.

Next, the operation control circuit of the air conditioner will be explained based on FIG. 3. As shown in the figure, the outdoor unit X has an outdoor control device 25 and an inverter main circuit 26, and each of the indoor units A to D has an indoor control device 27 and
- 27 (only one indoor unit 8 is illustrated; the same applies hereinafter). A main power circuit 28 is connected to a relay board 29, and two power circuits 30 and 31 are connected in parallel to the relay board 29. An inverter main circuit 26 is connected to one power supply circuit 30, and an outdoor control device 25 and each indoor control device 27 are connected in parallel to the other power supply circuit 31.

A first transformer 32 as a comprehensive current detection means is interposed in the main power supply circuit 28, and the first transformer 32 controls all the current input to the air conditioner, that is, to the inverter 1a. Input current, current required to operate the outdoor control device 25, current for driving the outdoor fan 3a, each indoor control device 2
7, input current to the indoor electric heater 16, current for driving the indoor fan drive motor 33, etc., can be detected. Furthermore, 34
is a second transformer, and this second transformer 34 is for detecting the input current to the inverter 1a.

Further, the inverter main circuit 26 has a rectifying circuit 35, a smoothing circuit 36, and a power transistor 37, and inputs a signal from a driver 38 provided in the outdoor control device 25 to the power transistor 37, and based on this signal, The motor 39 of the compressor 1 can be driven by the motor 39 of the compressor 1.

On the other hand, the indoor control device 27 includes a heater 16, an indoor fan drive motor 33, and a heater ON/OFF switch 4.
0, a remote controller 41, a display unit 42, and an indoor thermostat 43 are connected to each other. This is the part to configure.

The indoor control devices 27, . . . 27 and the outdoor control device 25 are connected by a signal line 44, and the indoor control device 27 sends the following three signals to the outdoor control device 25, namely: Indoor unit ON request signal, ■
A heater ON request signal and (2) a ΔT times signal corresponding to the difference between the indoor thermostat 43 and the set temperature are output. In the outdoor control device 25, the temperature difference detection circuit 45 detects each temperature difference ΔT between the indoor units A and D that are requested to be turned on.
Based on this ΣΔT, a frequency control signal is output from the driver 38 to the inverter main circuit 26 to control the frequency of the inverter 1a.

The outdoor control device 25 outputs two signals to the indoor control device 27: (1) an indoor unit ON signal, and (2) a heater ON signal.
...The operating state of D is controlled.

The outdoor control device 25 also includes a select switch 48.
and a breaker selection switch 49 are connected to each other. Note that 56 is a coil of the four-way switching valve 2. The select switch 48 serves as a priority setting means for manually changing the operating priority of each indoor unit A to D from the standard priority. This select switch 4
Reference numeral 8 includes a setting section 50 for setting the ranking, and a command section 51 that outputs the ranking set by the setting section 50 as ranking information. The setting section 50 includes:
It consists of two diodes 52 and 53 and a four-way slide switch 54, and is capable of outputting a two-digit binary digital signal. That is, when the slide switch 54 is at the A contact, it is "11", when it is a B contact, it is "10", when it is a C contact, it is "Ol", and when it is a D contact.
In the case of a contact, "00" is output to the command unit 51, respectively. Then, in the command unit 51, the first to fourth indoor units D to A (hereinafter, D,
CXB, abbreviated as A), the priority order is D-C-B-A in case of A contact, D→C→A→B in case of B contact,
In case of C contact, D→B→A→C in case of CSD contact
-B -A -D.

In addition, when using a microcomputer for the above control, the standard priority order of D-C→B→A is stored in the memory of the command unit 51, and the slide switch 5
When 4 is in the A contact, the operation is controlled based on the above standard priority order, and in the case of the B contact, "10" is input to the command unit 51, and the command unit 51 changes so that B becomes the lower priority. As a result, the operation is controlled in the priority order of D→C→A-B. Similarly, in the case of a C contact, C is
In the case of a D contact, D is changed to a lower priority,
It will be as described above.

Further, - the breaker capacity selection switch 49 is the first
This is a slide switch that serves as a reference current setting means for determining the upper limit value IB of the total current detected by the transformer 32, and is set to a value such as 30A, 40A, 50A, etc. within the capacity of the breaker installed in the power supply line. This is for selecting and setting as appropriate.

Next, a method for controlling the operation of the air conditioner will be explained based on FIG. 4, taking heating operation as an example. First, the total current IT detected in the first transformer 32 and the breaker capacity I set by the breaker capacity selection switch 49
At the same time as reading the above IT and IB (step S1),
(Step S2). When IT is smaller than 1B, the following control is performed. First, in step S3, it is determined based on ΣΔT whether there is a request to increase the frequency of the inverter 1a. If there is no request to increase the frequency, the process returns to step S1, but if there is a request to increase the inverter frequency, that is, if the room temperature has not risen sufficiently, in step S4, the inverter frequency and the second transformer 34 are changed. It is determined whether or not the detected inverter current has reached the upper limit. If neither of these has reached the upper limit, the inverter frequency is increased in step S5 and the process returns to step S1. If the second limit of any of the above months has been reached, in the next step S6, the heater in the room with the higher priority is turned on, and the process returns to step S1. On the other hand, in step S2 above, the IT
If the heaters 16 in all rooms are not turned off (step S7), turn off the heaters 16 in the room in descending order of priority (step S8), and then proceed to step S8. Return to S1. If the heaters 16 in all rooms are OFF (step S7), the inverter frequency is lowered in step S9, thereby lowering the total current, and the process returns to step S1, whereupon the same operation is repeated.

By performing the above control, the total current will always be less than the breaker capacity IB. Therefore, by setting the breaker capacity selection switch 49 within the range of the breaker capacity installed in the power supply line, you can easily select various breakers. It can be installed in the house where it is installed.

In the above embodiment, an example is shown in which the air conditioning capacity control means 55 for controlling the air conditioning capacity so that the total current IT does not exceed the reference current rR is configured in steps 57 to S9 in FIG. 4. This can also be configured by other methods, such as switching each indoor fan 33 and outdoor fan 3a between two high and low speeds, or in combination with other methods.

(Effect of the invention) In the air conditioner of the present invention, if the reference current value is set by the reference current setting means, the total current input to the air conditioner is controlled to be equal to or less than the reference current value. Therefore, by changing the set value of the reference current setting means, it is possible to install breakers of various capacities in houses where breakers are installed. As a result, there is no need for wiring work due to lack of breaker capacity as in the past, and costs for power supply equipment can be reduced.

[Brief explanation of drawings]

The figures show an embodiment of the air conditioner of the present invention, in which Fig. 1 is a block diagram of the overall configuration, Fig. 2 is a refrigerant circuit diagram, Fig. 3 is a block diagram of the control mechanism, and Fig. 4 is a flowchart of operation control. It is. DESCRIPTION OF SYMBOLS 1... Compressor, 32... Comprehensive current detection means, 49.
... Reference current setting means, 55... Capacity control means, A,
B, C, D...indoor unit, X...outdoor unit.

Claims (1)

[Claims] 1. In an air conditioner that configures a refrigeration cycle by connecting multiple indoor units (A) to an outdoor unit (X) having a compressor (1), the total current input to the air conditioner (IT), and an outdoor unit (X) and/or indoor unit (A) to prevent the total current value (IT) from exceeding a reference current value (IB). An air conditioner characterized by comprising: a capacity control means (55) for controlling the air conditioning capacity of the air conditioner; and a reference current setting means (49) for variably setting the reference current value (IB).