JPS6159141A - Variable capacity type air conditioner - Google Patents

Abstract

PURPOSE:To provide a variable capacity air conditioning system that can smoothly control the temperature during a sleep pattern, etc. by gradually expanding the low capacity operation frequency zone based on the cumulative time of a timer part which starts upon the operation pattern selection signal. CONSTITUTION:When operating under the cooling mode, setting the temperature Ts and the operating hours and selecting 'sound sleep' by an operating pattern selecting switch 23 will cause a differential temperature detecting circuit 32 to determined the difference between the room temperature and the set temperature Ts, and the resultant signal (e) is inputted to an operation control circuit 33, wherein the operation frequency zone of a compressor motor proportionate to the temperature differential, for instance 90Hz zone Z90, is read out to perform the cooling operation at the maximum capacity for 90Hz. As the room temperature is lowered, the operation control circuit 33 reduces the operation frequency zone gradually like Z70(70Hz) Z50(50Hz) Z30(30Hz). An inverter 4 is operated in this manner to perform the cooling operation control for the set hours.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable capacity air conditioner that controls the rotation speed of a compressor motor at a frequency that corresponds to the difference between a set temperature and an indoor temperature.

[Technical background of the invention]

As a conventional 8-position variable capacity air conditioner, for example, an operation unit having a room temperature control switch, a timer switch, and an operation pattern switch for selecting an operation pattern such as "sleep";
an indoor temperature detection sensor, a control device that outputs an operating frequency command signal based on signals provided from the operating section and the indoor temperature detection sensor, and an inverter that provides an operating current of a predetermined frequency to the compressor motor based on the command signal. There are some that have the following.

And with this type of air conditioner, you can enjoy what is called a "sleepful sleep" when you go to bed.
When an operation pattern is selected, cooling or heating operation is performed, for example, as shown in FIG.

Here, Figures 5(a) and 5(b) show the relationship between the passage of time and seedling temperature when "Sleep" is selected as the operating pattern, and Figure 5(a) shows the diagram during cooling operation, and FIG. 6(b) is a diagram during heating operation.

When selecting the "Sleep" operation pattern for cooling operation, set the temperature T using the room temperature control switch in the control panel.

Set the sleep driving time t with the timer switch. After setting each and selecting "Sleep" with the driving pattern selection switch, turn on the driving switch.

Then, the control device changes from the start of operation to time t1 (for example,
Based on the set temperature T, an operating frequency command signal corresponding to the difference between the set temperature T and the detected room temperature value is given to the inverter for up to 1 hour), and the compressor motor is controlled by the operating current that is the output of this inverter. Rotate at the specified rotation speed and set temperature T.

Cooling operation is performed so that the difference between the detected room temperature and the detected room temperature value becomes zero.

At time t1, the control device 1 changes the set temperature to (T, +1
℃), and the same cooling operation as above is performed at this set temperature (T5+1℃).

τ Further, at time t2 (for example, 2 hours), the set temperature is changed to a predetermined shift limit temperature (T, +2°C).
) at Schiff 1-Sashiko's set temperature (T, +2°C) for the set time t. Perform cooling operation until After time t2, the air temperature decreases as time passes, and when the set temperature T3 is reached at time t, the control unit 1 temporarily stops the operation. After that, the room temperature continues to be monitored, and when the room temperature returns to (T, +1°C) at time tb, operation is resumed at the set temperature (T, +2°C) for the time T set by the timer switch. Then stop all operations.

On the other hand, in the heating operation, heating operation control similar to that described above is performed according to a pattern as shown in FIG. 5(b).

[Problems with background technology]

However, in conventional variable capacity air conditioners,
When the "restful sleep" pattern is selected, the set temperature is forcibly shifted at regular intervals, which may result in sudden temperature changes, which does not necessarily provide comfortable air conditioning control.

[Purpose of the invention]

The present invention was made in view of the problems of the prior art described above, and it is an object of the present invention to provide a variable capacity air conditioner that is capable of smooth temperature control during operation such as in a "sleep" pattern.

[Summary of the invention]

To achieve the above object, the present invention provides a conventional variable capacity air conditioner with a timer unit activated by an operation pattern selection signal, and a system that sequentially expands the low capacity operating frequency zone based on the cumulative time of this timer unit. The invention is characterized by comprising an operation control section that operates in accordance with the invention.

(Embodiments of the Invention) The present invention will be described in detail below with reference to FIGS. 1 to 4.

FIG. 1 is a diagram showing the main parts of a variable capacity air conditioner. In the figure, 1 is a control device, 2 is an operation unit that provides an operation signal to the control device 1, and 3 is a room temperature sensor that provides a room temperature detection signal to the control device 1. When an operation signal and a room temperature detection signal are applied to the controller 2', the control 2'Il device 1 performs predetermined calculations and provides an output signal to the inverter 4. The inverter 4 applies an operating current of a predetermined frequency to the compressor motor 5 based on an operating frequency command signal given from the control device 1, and frequency-controls the rotation speed of the compressor motor 5.

A fan motor drive circuit 6 is connected to the output side of the control device 1, and the fan motor drive circuit 6 rotates the indoor fan motor 7 based on an output signal given from the control device 1. Further, 8 is an outdoor fan motor connected to the output side of the inverter 4, and is rotated by a signal given from the inverter 4.

FIG. 2 is an external view showing an example of the operation section 2. As shown in FIG.

The operation unit 2 includes a run/stop switch 21, a slide-type V temperature adjustment switch 22 that adjusts the air temperature, a slide-type driving pattern selection switch 23 that selects a driving pattern such as "sleep", and a driving time. A slide-type timer switch 24 and the like are provided for making settings.

FIG. 3 shows an example of the circuit configuration of the control device 1.

It's nothing to show. This control 2'Il device 1 includes a timer circuit 31, a temperature detection circuit 32, and an operation control circuit.

Here, the timer circuit 31 sets the operating time based on the time limit signal a given from the timer switch 24 and provides the time signal to the operation control circuit 33. The temperature difference detection circuit 32 detects the set temperature T, which is the output of the room temperature control switch 4;
signal C and air temperature detection signal d detected by 1g sensor 3
The temperature difference is determined from the above and the signal e is given to the operation control circuit 33. The operation control circuit 33 inputs the pattern selection signal f, time limit signal a, and temperature difference signal e from the operation pattern selection switch 23, and adjusts the operating frequency of the compressor motor 5 according to the temperature difference stored in advance based on these input signals. is selected, and the low-capacity operating frequency range is expanded as the operating time elapses, and an operating frequency command signal q is output and given to the inverter 4.

Figure 4 (a-1) to (a-3), (b-1) to (b) shows the operation when automatically controlling the indoor 4 degrees in the above configuration.
This will be explained below with reference to -3).

Figure 4 (a-1) to (a-3) show the relationship between the compressor motor operating frequency due to the difference between room temperature and set temperature T, and (a-1) to (a-3) are during cooling operation. of, (b-
1) to (b-3) are diagrams during heating operation.

When selecting "Sleep" as the operating pattern during air conditioning operation, ・Place J5 on the operating section 2 in Fig. 2 and press V l? The set temperature T is set to, for example, 26°C using the uf adjustment switch 22, and the sleep driving time t is set using the timer switch 24. (5th
(see figure), and then set the rough operation pattern selection switch 2.
3, select "Sleep" and turn on the run/stop switch 21.

Then, the signal at given from the timer switch 24,
: Based on the timer circuit 31, the operating time T. Start calculating the
Time t1 (for example, 1 hour) shown in FIG. 5 from the start of operation
Until then, the temperature shown in FIG. 4 (a-1>
Cooling operation is performed with an operating frequency pattern like this. That is, the room temperature (e.g., 28°C) is detected by the room temperature sensor 3, and this detection signal d is detected as the set temperature T, (e.g., 26°C).
) is applied to the temperature difference detection circuit 32 together with the signal C.

The temperature difference detection circuit 32 determines the difference of 2° C. between the room temperature and the set temperature T, and provides the obtained signal e to the operation control circuit 33.

The operation control circuit 33 stores in advance an operation frequency pattern with respect to temperature as shown in FIG. 4 (a-1).
From this stored value, the operating frequency zone of the compressor motor 5 corresponding to the temperature difference +2°C, for example, 90Hz zone Z9o is determined.
is read out and the command signal Q is given to the inverter 4.

The inverter 4 supplies an operating current of 90 Hz to the compressor motor 5 based on the command signal 9, and drives the compressor motor 5 at the maximum capacity of 90 Hz to perform cooling operation. Here, the operation control circuit 33 supplies the command signal Q to the inverter 4, simultaneously rotates the indoor fan motor 7 via the fan motor drive circuit 6, and rotates the outdoor fan motor 8 via the inverter 4. The outdoor fan motor 8 operates in synchronization with the compressor motor 5. As the compressor motor 5 rotates at 901-IZ, the air temperature decreases. As the room temperature decreases, the operation control circuit 33 changes the operating frequency zone to Z7° (
70Hz) → Z5(, (50Hz) → Z
3o (30H7), the rotational speed of the compressor motor 5 is lowered via the inverter 4, and the cooling capacity is gradually reduced. When the difference between the air temperature and the set temperature T becomes zero, the frequency 0)-1z (7) Zo zone), the operation control circuit 33 stops the compressor motor 5 via the inverter 4. Then, the room temperature becomes higher than the set temperature T. The compressor motor 5 is driven again at an operating frequency according to the temperature difference, and cooling operation control is performed so that the room temperature reaches the set temperature T. [Sleep] When time t1 (for example, 1 hour) has elapsed since the start of operation, the operation control circuit 33 sets the operating frequency zone Z3o of the low-performance saw at or near the minimum based on the signal from the timer circuit 31 as shown in FIG. 4(a). -2> range, and the inverter 4 is operated with the frequency command signal q.

Next, when time t2 (for example, 2 hours) shown in FIG. 5 has elapsed, the low capacity operating frequency zone Z3o is changed to
For example, set T once, like -3.

Expand the range to +2°C and operate the inverter 4 for 2 seconds using this frequency pattern for the set time t. Cooling operation is controlled until

As described above, since the low capacity operation frequency zone Z3o is expanded depending on the elapsed time after operation, the quality (with respect to the set temperature) changes slowly to Ab. Therefore, the temperature can be changed more smoothly than the conventional method of shifting the set temperature value, and an ideal sound sleep circuit can be achieved.

On the other hand, when selecting "Sleep" as the driving pattern in heating mode, similarly to cooling mode, if the operating time is in the range o-t, the operating time is in Figure 4 (b-1>, in the range from ti to t, it is in Figure 4). Figure (b-2), and Figure 4 (b-3) in the range from t2 to t.
) Heating operation is performed with a frequency pattern such as , and thereby the same effect as cooling operation can be obtained. In addition, the reason why the difference between the room temperature and the set temperature T5 in Figure 4 "i (b -1) is 80H7 in the range of -2°C to -2°C is because the heating burden at the start of operation is large. , the operating frequency is lowered to reduce overload operation of the compressor motor 5.

In addition, in the above embodiment, the control device 1 in FIG.
The circuit configuration is not limited to the one shown in FIG. 3, but it is possible to achieve the same function with other circuit configurations, and it is also possible to use a microcomputer for miniaturization.

Further, in the above embodiment, a so-called sleep circuit has been described, but the present invention is not limited thereto, and can of course be applied to other control methods that cause smooth temperature changes.

[Effects of the Invention] The present invention expands the operating range at the minimum capacity or in a state close to the minimum capacity while monitoring the passage of time, so that smooth temperature changes can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a main configuration diagram of a variable capacity air conditioner showing an embodiment of the present invention, Fig. 2 is an external view of the operation section shown in Fig. 1, and Fig. 3 is a circuit (8 components) of the control device shown in Fig. 1. 4 is an explanatory diagram of the operation of FIG. 1, and FIG. 5 is an explanatory diagram of the operation of the conventional variable capacity air conditioner. 1...Control 211 device, 2...Operation unit, 3...・Room temperature sensor, 4... Inverter, 5... Compressuna motor, 22... Air temperature adjustment switch, 23... Operation pattern selection switch, 24... Timer switch, 3
1... Timer circuit, 32... Temperature difference detection circuit, 33
...Driving control i11 circuit. Applicant's agent Kiyoshi Inomata Drawing foreword (no changes in content) Figure 3 Section 5 Procedures Nei 1n Original book Date of September 1982

Claims (1)

[Claims] The operating frequency zone of the compressor is divided into multiple stages from low capacity to high capacity according to the difference between the set temperature and the indoor temperature, and the indoor temperature is detected and the temperature difference between the set temperature and the set temperature is determined. In variable capacity air conditioners, the operating current in the operating frequency zone corresponding to this temperature difference is output from the inverter and the rotation speed of the compressor motor is controlled using this output. and an operation control unit that operates to sequentially expand the low capacity operating frequency zone according to the cumulative time of the timer unit.