JPH0252944A - Controller for total outdoor air air-conditioner - Google Patents

Abstract

PURPOSE:To make it possible to control total outdoor air room-cooling operation and prevent a rapid change in the temperature of the discharged air during the thermo in the room is OFF by providing a damper device for mixing the indoor air and outdoor air and, during the thermo is ON, maintaining the state of the total outdoor air and, during the thermo is OFF, mixing the indoor air with the outdoor air by a damper only when the temperature of the discharged air is higher by certain temperature than a set temperature of the indoor air. CONSTITUTION:When the room temperature TR drops and it becomes lower than a set value TRS for room temperature, that is when thermo is OFF, a compressor motor 1a and an outdoor blower motor 3a are stopped and the room cooling operation is stopped, but a control device 10 calculates the value of (TR-TRS) after a specified time, and if the calculated value is smaller than DELTATDW which is set by a draft width setting device, a damper reversing relay is not excited but it is left as it is, but if (TD-TRS)>DELTATDW is given, a damper motor 16 is reversed by closing a relay for reversing the damper and opening a relay for rotating positively the damper. Here, since the low temperature indoor air is mixed with the high temperature outdoor air, the temperature TD of discharged air falls, and (TD-TRS)<DELTATDW is given eventually, and at that time the excitement of the damper reversing relay is magnetically erased and the damper motor 16 stops at that position.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an all-outside air type air conditioner and an air conditioner with an outside air introduction mechanism, and particularly relates to changes in the temperature of the blown air when the indoor thermometer is turned FF during all-outside air cooling. The present invention relates to a control method for reducing the temperature of the air and obtaining an appropriate blowout temperature even in the face of undesigned changes in outside air temperature.

[Conventional technology]

The conventional equipment was “Hitachi package type near conditioner,”
All-fresh style service manual.

As described in P6 and P7 of PF-8601J,
It is constructed so that 100% outdoor air is always drawn in.

In addition, as an air conditioner with an outside air introduction mechanism, the American carrier company 19
Catalog 50EG-I P, PI3, PI published in 1980
As described in 3, the control for all outside air cooling operation is not incorporated, and the system is configured such that outside air cooling only when the outside air is low temperature, that is, all outside air introduction and compressor operation cannot be performed at the same time.

[Problem to be solved by the invention]

In the first example of the above-mentioned conventional technology, when the indoor thermostat is turned off, the compressor stops, but 100% outside air is introduced, so especially when the outside air is high temperature, the blow height air temperature changes suddenly, so it is difficult for the user to use the compressor. There was an issue that made me feel uncomfortable.

In addition, in the second example, the damper device only takes into consideration the outside air cooling operation control that is applied when the outdoor air is low temperature, and the damper device is only concerned with the outside air cooling operation control that operates the compressor and introduces all the outside air. was not taken into account.

The purpose of the present invention is to enable all outside air cooling operation control for an air conditioner with an outside air introduction mechanism, and to prevent sudden changes in the temperature of the blowing air when the indoor thermostat is turned off. Another purpose is to obtain an appropriate blowout air temperature even at low outside temperatures.

[Means to solve the problem]

The above purpose is to provide an air conditioner in which an outdoor unit consisting of a compressor, a condenser, an expansion valve, and an outdoor blower and an indoor unit consisting of an evaporator and an indoor blower are connected via piping to form a refrigeration cycle. A damper device is provided in the ventilation duct, a damper drive device for mixing indoor air with outside air, indoor air detection means, mixed air blowout temperature detection means, and a compressor, depending on the size relationship between the room temperature setting value and the room temperature. This is achieved by providing a control means for controlling the outdoor blower and the damper drive device.

In other words, the temperature of the blowing air is detected when the indoor thermometer is set to FF,
If the value is higher than the set room temperature by a certain value, the damper drive device is driven to mix the indoor air, which is lower than the outside air temperature, with the high-temperature outside air, so that the mixed air temperature, that is, the blowing air temperature, is more constant than the indoor air temperature. It is only necessary to control the value so that it falls within a range greater than the value.

Furthermore, if the blowout temperature becomes high due to high outside air temperature during cooling, low-temperature indoor air may be mixed with introduced outside air.

[Effect]

When the thermostat is ON, the damper device is kept closed to the indoor ventilation side, that is, in a state where all outside air is maintained. When the thermostat is OFF, the blowing air temperature (TD) (equal to the outside air temperature (To)) is the indoor set temperature. Only when the temperature is higher than (TR8) by a certain value, the damper device operates to mix indoor air with outside air and suppress a sudden rise in the blowout air temperature (TD). Therefore, if TO is lower than TR3, the damper device remains closed to the room ventilation side.

Since indoor air is not recirculated unnecessarily, the characteristics of all-outside air operation are not impaired and malfunctions do not occur.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an example of the entire system when the present invention is applied to an air-cooled split type air conditioner, in which a compressor (MC) 1 and a condenser 2 are connected by piping 51 to form a refrigeration cycle.
．． An outdoor unit 5 comprising an outdoor blower 3, an outdoor blower motor (MFC) 3a, and a refrigeration cycle pressure reduction mechanism 4 is installed outdoors. An evaporator 6, an indoor blower 7, an indoor blower motor (MEF) 7a forming a refrigeration cycle,
A damper drive installed at the intersection of the outside air duct 22 and the ventilation duct 21! jJ device (DMA) 8 and damper mechanism 9,
The indoor unit 15 is composed of a control device 10 connected to a power source, a discharge duct 2o to the room, a ventilation duct 21 . and an outside air duct 22 that takes in outdoor air. Moreover, it was installed inside the outside air duct 22. An outside air temperature sensor (Tho) 11, an indoor temperature sensor (ThR) 12 installed in the room 52, an outlet air temperature sensor (ThM) 13 installed at the unit outlet, and a remote control device (RMC) installed in the room 52. 14 are each connected to the control device 10 by a signal line.

This control device 10 includes a room temperature (TR) and a room temperature set value (TR).
5) comparison means for detecting the magnitude of
A means for controlling each motor is provided. When the damper drive device 8 rotates in the normal direction, the damper mechanism 9 rotates in the direction of arrow A, and stops when the fully open limit switch 16 opens, and when the damper drive device 8 rotates in the normal direction, the damper mechanism 9 rotates in the direction of arrow B, and the Increase the amount of air mixed with outside air. That is, it operates in the direction of increasing the amount of recirculation, and is finally stopped by the front closing side limit switch 17.

Figure 2 shows the operating circuit. The control device 110 receives the operation switch 14a from the remote control device (RMC) 14 as an input.
, each setting state of the air blower switch 14b, the air conditioning switch 14c, and the room temperature setting device 14d, and the outside air temperature sensor (
Th) 11, room temperature (ThR) 12. After taking in each sensitive value of the mixed air temperature sensor (ThM) 13, and each setting state of the draft width setting device (ADW) 19a and the maximum blowing temperature setting device (AMD) 19b and performing comparison calculations, the results can be output. It is connected to the.

The indoor blower motor operation relay (ARP) 10a is connected to the indoor blower motor (MFE) 7a, the cooling operation relay (A
RC) 10b is a compressor motor (MC) la, and an outdoor blower motor (MCF) 3a.

The damper forward rotation relay (ARP) 10c connects the damper motor (M
D) Attach the damper reverse relay (ARN) to the 16 forward rotation tap.
) 10d are respectively connected to the reversing taps of the damper motors 16 via full-close limit switches (LSN) 17 to control the operation of each motor 6. The draft width setting device 19a is used to set the permissible blowing temperature when the thermostat is OFF. The maximum blowout temperature setting device 19b is used to set the maximum blowout temperature, for example, when the outside temperature is high, and can be readjusted by the user.

The operation of this embodiment will be explained below.

1. Air blowing operation When the air blowing switch 14b is in the ON state, the operation switch 14a is turned on.
When turned ON, ARFloa is excited.

At the same time as the indoor blower motor 7a is operated, the damper forward rotation relay 10c is energized, and the damper motor 16 rotates in the forward direction.Finally, the fully open limit switch is pushed by the damper device and opens, stopping the circuit. It will be fully opened and all outside air will be in operation.

2. Cooling operation (at 70N) Next, when the room temperature TR is higher than the room temperature set value TR3, that is, when the thermostat is ON, when the cooling switch 14c is turned on, the cooling relay 10b is closed. The compressor motor 1a and the outdoor blower motor 3a are operated, the refrigeration cycle is in a cooling operation state, the outdoor air is cooled by the evaporator 6, and low-temperature air is supplied indoors. 3. When the thermostat is OFF, then TR When the value decreases and becomes lower than TR6, that is, when the thermo-FF state is reached, ARC10b is opened,
The compressor motor 1a and the outdoor blower motor 3a are stopped and the cooling operation is stopped, but the control device 10 calculates the value (including positive and negative) after a certain period of time (TR-TR3) and uses it as the draft width setting device 18a. The value ΔTDW set by
If the value is smaller than , the damper reversal relay 10d is not energized and left as is; however, if (TD-TRS)>ΔTDW, the damper reversal relay 10d is closed and the damper forward rotation relay 10c is opened.
Reverse 6.

Here, since the low-temperature indoor air is mixed with the high-temperature outdoor air, the blowing air temperature Tl) decreases, and eventually (TD-TR8)
<ΔTDW, and at that point the damper reversal relay 10
d is demagnetized, and the damper motor 16 stops at that position [1
．． do. This control has the effect of preventing excessive fluctuations in the blown air during thermo-FF. When the thermostat is turned ON again, the compressor motor 1a and the outdoor blower motor 3a are operated, and at the same time the damper motor 16 is also rotated in the normal direction, and the damper motor 16 is stopped at the fully open position by closing the fully open limit switch 16, and all outside air cooling is performed. It becomes driving.

4. When the blowout air temperature is high during cooling operation If, for example, the outside air temperature becomes high during cooling operation when the thermostat is ON, the blowout air temperature TD is higher than the value TDMAX set by the maximum blowout air temperature setting device 18b. If the temperature increases, the damper device 9 is reversed as in the previous section 3, and the low-temperature indoor air is mixed with the high-temperature outside air, so that the temperature of the mixed air entering the evaporator 6 becomes lower than the outside air temperature, so TD becomes TDMAX.
will be lower than At that point, the damper device 9 is stopped, but after that, when (T, DMAX-TD) becomes a certain temperature or higher, it is preferable to open the damper device 9 again for a certain period of time. This control has the effect of preventing the blowout temperature from becoming excessive even when the outside temperature is high.

Figure 3 shows a comparison of the blowout temperature changes when the thermostat is off for a conventional machine without a draft prevention function.

Figure 4 shows a comparison of the change in the blown air at high outside temperatures with a conventional machine without the function to prevent excessive blown air temperature.

Although this embodiment has been shown for cooling, it can also be applied to heating control by reversing each temperature comparison formula. That is.

When the heating thermometer is turned off, indoor air is mixed with outside air when (TR3-TD)>ΔTDW, and if the temperature of the blown air becomes lower than the minimum blown air temperature, an excessive drop in the blown air temperature can be similarly prevented.

〔Effect of the invention〕

Since the present invention is configured as described above, 1. It is possible not only to prevent a sudden change in the blowout temperature when the thermostat is FF, but also indirectly to prevent a sudden increase in indoor humidity when the outside air is humid and high temperature; 2. Even in cooling operation when the outside air temperature is high, it is possible to obtain an appropriate blowout temperature at the expense of some amount of total outside air introduction.In other words, since there was no conventional control technology for this, In this case, the processing air volume was approximately 2/2 of the normal air flow rate relative to the heat exchanger area, but with this method, the normal air flow rate can be applied at the expense of sacrificing the total outside air quality during rare high outside temperatures. .

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram of an embodiment of the present invention, FIG. 2 is a control circuit diagram of the same system, and FIGS. 3 and 4 are comparison diagrams of blowout temperature changes with the prior art.

Claims (1)

[Claims] 1. An outdoor unit consisting of a compressor, a condenser, an expansion valve, and an outdoor blower is connected to an indoor unit consisting of an evaporator and an indoor blower by piping to form a refrigeration cycle. In an all-outside air type air conditioner that introduces air and supplies it indoors, a ventilation passage from inside the room is provided on the indoor blower suction side, and a damper device is installed in the passage to prevent air conditioning during cooling operation when the outside temperature is high. Indoor thermo O
When FF is on, the damper device is driven to mix indoor air with outdoor air as necessary so that the temperature of the blown air does not rise above a certain value above the indoor temperature set value, and when the indoor thermostat is on, the damper device is driven to block the indoor ventilation passage. An all-outdoor air conditioning system characterized by a driving device.