JPS599025B2 - air conditioner - Google Patents

Description

Detailed Description of the Invention The present invention provides a heat pump air conditioner that performs heating operation by exchanging heat between an indoor heat exchanger to which a heating medium is supplied from a compressor and air in a conditioned room using a blower. It is related to.

A general heat pump type air conditioner consists of a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, and a pressure reducing device 4 as shown in Figure 1.
and an indoor heat exchanger 5 are connected via piping to form a refrigerant circuit 6, and by switching the four-way valve 2, the refrigerant flows in the direction of the solid line arrow during cooling, and the refrigerant flows in the direction of the broken line arrow during heating. A cooling cycle and a heating cycle are formed respectively.

Further, 7 is an outdoor air blower that promotes heat exchange between the outdoor heat exchanger 3 and outside air, which acts as a condenser during cooling and an evaporator during heating, and 8 is a chamber that acts as an evaporator during cooling and a condenser during heating. This is an indoor blower that promotes heat exchange between the inner heat exchanger 5 and the air in the conditioned room.

In the above-mentioned air conditioner, when heating operation is performed using the refrigerant circuit 6 in the heating cycle, since the indoor heat exchanger 5 is not sufficiently warmed at the beginning of operation, the indoor blower 8 blows cold air into the room, making it difficult to live. This will cause discomfort to the person.

Therefore, in the past, the temperature of the indoor heat exchanger 5 was detected by a thermostat, and the operation of the indoor fan 8 was stopped until the heat exchanger temperature reached a preset temperature of the thermostat, and the compressor 1 and the outdoor fan were He was driving 7 take.

However, the temperature of the air blown out by the blower 8, which residents perceive as cold air, is not constant and varies depending on the season.
If the blower 8 is stopped until the heat exchanger temperature reaches the preset temperature of the thermostat, it may take a long time for the indoor heat exchanger 5 to reach the set temperature when the outside temperature is low. In the past, there was a risk that residents would feel cold if they were put away.

Also, in winter, the outside temperature is lower than in spring and autumn, so the temperature of the air-conditioned room is often set relatively low, and the temperature of the air blown by the blower 8 is often a little low, making it feel warm.

The present invention has been made in view of the above-mentioned facts, and uses a blower to heat the air in the room to be conditioned and the indoor heat exchanger to which heating medium is supplied from the compressor, such as in a heat pump type air conditioner. In those that are replaced and operated for heating, the temperature of the conditioned room and the temperature of the indoor heat exchanger are detected, and the preset temperature of the conditioned room temperature is compared with the actual temperature of the conditioned room. The compressor is controlled to start and stop, and the set temperature of the conditioned room is compared with the temperature of the indoor heat exchanger to control the blower to start and stop or to adjust the air volume, thereby bringing the temperature of the conditioned room close to the set temperature. At the beginning of operation, the blower is stopped or operated at a small air volume for an appropriate period of time depending on the set temperature of the conditioned room and the temperature of the indoor heat exchanger, and the temperature of the conditioned room is maintained. An object of the present invention is to provide an air conditioner that can perform cold air prevention operation by controlling a blower according to a set temperature.

Hereinafter, one embodiment of the present invention will be explained based on the drawings by applying it to the heat pump air conditioner shown in FIG. 1. In FIG. It includes a sensor 10, a sensor 11 that detects the indoor heat exchanger temperature TC, and an AD (analog-digital) converter 12 that converts each sensor signal into a digital quantity.

13 sets the set temperature Ts of the air-conditioned room temperature to a predetermined range Tso-
This is a temperature setting device that adjusts the temperature to an arbitrary value within Tsp, where Tso<Tsp).

14 is an operation control device consisting of a microcomputer with one chip or several chips, which inputs the output of the A-D converter 12 by scanning and converts the temperature of the air-conditioned room TR and the temperature of the indoor heat exchanger Tc into binary signals. A first storage unit 15 that stores the temperature, and a second storage unit 1 that stores the set temperature Ts of the air-conditioned room temperature adjusted by the temperature setting device 13 as a binary signal.
6.

When the input signals indicate different numerical values, each of the storage units 15 and 16
Memory content becomes new.

The conditioned room temperature TR stored in the first storage section 15 is sent to the room temperature determination section 17, and the indoor heat exchanger temperature Tc is sent to the cold air determination section 18.

Further, the set temperature Ts stored in the second storage section 16 is sent to the room temperature determination section 17 and the cold air determination section 18.

The room temperature determination unit 17 compares the actual air-conditioned room temperature TR and the set temperature Ts, determines whether cooling operation or heating operation should be switched, and controls the four-way valve control relay 20 via the output control unit 19. It also determines whether TR≧Ts and controls the compressor control relay 21 and the outdoor blower control relay 22.

Also, two control relays 23. 24 to adjust the indoor blower 8 to an appropriate air volume according to the difference between the temperature TR of the conditioned room and its set temperature Ts, and to control the start/stop of the indoor fan 8.

The cold air determination unit 18 starts operating based on the heating command from the room temperature determination unit 17, reads the set temperature Ts of the air-conditioned room temperature and the indoor heat exchanger temperature Tc, and performs calculation determination using the following equation.

Tc <Ts +To (To is a pre-stored temperature setting value)... (1) And (when formula 1 holds true, send an output that has priority over the output of the room temperature determination section 17 to the output control section 19. Output control section 19
to control relay 23. 24 is made to output an off signal, and the indoor blower 8 is prevented from operating.

The output of the cold air determination unit 18 is canceled when the following equation is satisfied.

Tc≧T s 1To ・”・(2) If you start operation in cold weather such as winter,
4, the room temperature determination unit 17 reads the current air-conditioned room temperature TR stored in each storage unit 15, 16 and the preset temperature Ts, and the heating signal is sent to the output control unit 19. The control relay 20 is sent to the cold air determination unit 18.
An on signal is supplied to the four-way valve 2, and the four-way valve 2 is switched as shown by the broken line.

In addition, the cold air determination unit 18 starts operating, reads the set temperature Ts of the temperature of the air-conditioned room and the indoor heat exchanger temperature Tc at that time, and determines whether equation (1) holds.

At the beginning of operation, the temperature of the indoor heat exchanger 5 is almost equal to the temperature of the air-conditioned room TR, and since Tc is low, equation (1) is established, and the output control unit 19 performs control based on the output of the cold air determination unit 18. No on signal is supplied to any of the relays 23, 24, and the indoor fan 8 remains stopped.

On the other hand, as the room temperature determination unit 18 determines that TR<Ts,
Based on the output of the room temperature determination unit 17, an on signal is supplied from the output control unit 19 to the control relays 21 and 22, and the compressor 11
And the outdoor fan 7 is activated.

As a result, the compressor 1 operates in the refrigerant circuit 6 to enter a heating cycle, and the high-temperature, high-pressure refrigerant discharged from the compressor 1 is supplied to the indoor heat exchanger 5.

Therefore, the indoor heat exchanger temperature Tc gradually increases,
1 to 2 minutes after the start of operation, the indoor heat exchanger temperature T
When c becomes higher than the set temperature Ts of the air-conditioned room temperature by To, the cold air discrimination section 18 confirms that equation (2) holds and stops outputting, and the output control section 19 changes the temperature of the room temperature discrimination section 1.
Based on the command from 7, control relays 23 and 24 are turned on,
The indoor blower 8 is controlled to be turned off, and the air volume is selected in stages so that the indoor blower 8 is in an optimal state, and its operation is started.

After the air in the conditioned room is heat exchanged with the indoor heat exchanger 5 in this way, it is circulated indoors by the indoor blower 8 to perform heating operation, and the temperature TR in the conditioned room is changed to the set temperature T.
When the temperature exceeds s, an off signal is output from the room temperature determination unit 17 to the control relays 21 and 22 via the output control unit 19, and the compressor 1
Then, the outdoor fan 7 is stopped, and the temperature TR of the conditioned room is maintained near the set temperature Ts.

If the temperature TR of the conditioned room further rises by a predetermined temperature or more after the heating operation has stopped, or if the temperature of the conditioned room is higher than the set temperature at the start of operation, a cooling command is issued from the room temperature determination unit 17, and the cooling command is issued from all directions. An off signal is supplied to the valve control relay 20, and the four-way valve 2 of the refrigerant circuit 6 is switched as in the experiment to enter the cooling cycle, and the room temperature determination unit 17 is activated according to the difference between the air-conditioned room temperature TR and its set temperature Ts. The control relays 21 to 24 are controlled based on the output, and the compressor 1 and the outdoor blower 7 are controlled to start and stop, and the indoor blower 8 performs a blowing operation with an appropriate air volume.

In this case, the cold air determination section 18 does not operate, and there is no risk of accidentally stopping the indoor fan 8.

In this way, in this device, as in the above-mentioned embodiment, at the beginning of the heating operation, the indoor fan 8 is stopped until the indoor heat exchanger temperature Tc becomes higher than the set temperature Ts of the temperature of the conditioned room by a fixed temperature To. Since the set temperature Ts of the conditioned room temperature is set to a lower value (for example, Tsl close to Tso) than in spring and autumn, such as during cold weather, the operation is delayed.
), the cold air prevention operation ends at a relatively low indoor heat exchanger temperature Tel and the normal heating operation starts, and since the temperature of the air-conditioned room is low, the air conditioner does not feel like cold air, but rather continues for a long time. The cold wind prevention operation continues for hours, so residents will not feel cold.

On the other hand, when the set temperature Ts of the conditioned room temperature is high (for example, Ts2 close to Tsp) like in spring and autumn, the cold air prevention operation continues until the indoor heat exchanger temperature Ts2 (Tc2>Tel) is relatively high. However, since the outside temperature is high, this time will not be so long, and in fact, it will prevent the residents from feeling uncomfortable due to the warm wind blowing out.

In the above-described first embodiment, the operation of the indoor fan 8 is stopped based on the output of the cold air determination unit 18 of the operation control device 14, but the same problem may occur even if the indoor fan 8 is operated with a small air volume. It can be effective.

In addition, the cold air discrimination unit 18 is provided with a multi-stage discrimination function regarding the set temperature of the air-conditioned room and the temperature of the indoor heat exchanger, so that the air volume of the indoor blower 8 is increased in stages from a small air volume or a stopped state. You can also do it.

Furthermore, it can be used not only at the beginning of the heating operation but also for controlling the air volume of the indoor blower 8 according to the difference between the heat exchanger temperature Tc and the set temperature Ts of the air-conditioned room temperature during the heating operation.

As described above, the present invention is applicable to a heat pump type air conditioner that performs heating operation by exchanging heat between an indoor heat exchanger to which a heating medium is supplied from a compressor and air in a conditioned room using a blower. The temperature of the conditioned room and the temperature of the indoor heat exchanger are detected, and the preset temperature of the conditioned room is compared with the actual temperature of the conditioned room to control the start and stop of the compressor. By comparing the set temperature of the conditioned room temperature with the temperature of the indoor heat exchanger and controlling the blower on/off or adjusting the air volume, the temperature of the conditioned room can be maintained near the set temperature, and the temperature of the conditioned room can be maintained close to the set temperature. Based on the set temperature, the blower can be stopped or the air volume can be reduced when there is a risk of cold air being blown into the room via the indoor heat exchanger, and by adjusting the set temperature, the initial blown air can be reduced. The present invention is useful because it provides an air conditioner that not only allows the temperature to be selected, but also allows comfortable heating operation such as cold air prevention operation suitable for the season.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram showing an example of an air conditioner to which the present invention is applicable, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1...Compressor, 5...Indoor heat exchanger, 8...Indoor blower, 9...Temperature detection device, 13... ...Temperature setting device, 14...
...Operation control device, 17...Room temperature control section, 18
...Cold air discrimination section.

Claims (1)

[Claims] 1. Detecting the temperature of the conditioned room and the temperature of the indoor heat exchanger in a device that performs heating operation by exchanging heat between the indoor heat exchanger, which is supplied with heating medium from the compressor, and air in the conditioned room using a blower. A temperature detection device, a temperature setting device that adjusts the set temperature of the conditioned room, and a compressor that controls the start and stop of the compressor by comparing the set temperature of the conditioned room and the actual temperature of the conditioned room. It is characterized by comprising a control means and an operation control device having a control means for a blower that controls starting and stopping of the blower or adjusting the air volume by comparing the set temperature of the air-conditioned room and the temperature of the indoor heat exchanger. air conditioner.