JP2002174450A - Air-conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress supply of cold air during heating operation. SOLUTION: When a temperature air volume control part (62) starts operation, after an indoor fan (32) is driven with the preset lowermost number of revolutions, the refrigerant temperature of an indoor heat exchanger (31) is increased to a value higher than a given value, and when a temperature difference between the refrigerant temperature of the indoor heat exchanger (31) and the indoor temperature is increased to a value higher than a given value, the number of revolutions of the indoor fan (32) is increased to the intermediate number of revolutions higher than the lowermost number of revolutions. A time air volume control part (63) increases stepwise the number of revolutions of the indoor fan (32) to the set number of revolutions with a lapse of a time when the indoor fan (32) is driven at the intermediate number of revolutions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to a measure for controlling an air flow after the start of operation.

[0002]

2. Description of the Related Art Conventionally, air conditioners have been disclosed in
As disclosed in Japanese Patent Laid-Open No. 1-218349, there is known an apparatus having a refrigerant circuit configured by connecting a compressor, an indoor heat exchanger, an expansion mechanism, and an outdoor heat exchanger in order. The air conditioner controls an operating capacity of the compressor by connecting an inverter circuit to a motor driving the compressor, changing an output frequency of the inverter circuit, thereby changing a rotation speed of the motor. . Further, the air conditioner controls the amount of air blown into the room by controlling the rotation speed of an indoor fan provided in the indoor heat exchanger.

In this type of air conditioner, the number of revolutions of the indoor fan is controlled immediately after the heating operation is started.
Specifically, as shown in FIG. 4, at the start of the operation, this type of air conditioner has an extremely low rotation speed LL at which almost no wind is generated until the refrigerant circulates and a stable heating operation can be performed. A preparatory operation for rotating the indoor fan is performed at a predetermined condition (A). When the predetermined condition (A) is reached, the rotation speed of the indoor fan is increased to a high rotation speed H, which is the maximum rotation speed, so that the indoor temperature quickly approaches the desired temperature. Controlling indoor fan.

[0004] The predetermined condition (A) may be one of a case where the refrigerant temperature tc of the indoor heat exchanger, which is a condensing temperature, is higher than 34 ° C and a case where 40 seconds have elapsed after the start of operation. The time when the condition is satisfied is set.

[0005]

However, in the control of the indoor fan in the above air conditioner, the problem that the cool air is blown out at the start of operation has not been sufficiently solved.

In particular, in an air conditioner using a compressor whose operating capacity is changed according to the output frequency of the inverter circuit, the operating capacity gradually increases over time. For this reason, the refrigerant temperature of the indoor heat exchanger only gradually rises,
It takes a considerable time for the refrigerant temperature of the indoor heat exchanger to reach the predetermined temperature. As a result, before the refrigerant temperature of the indoor heat exchanger reaches the predetermined temperature, the indoor fan may be driven at a high rotation speed H after elapse of 40 seconds. In this case, since the maximum amount of cold air is blown, there is a problem that the user feels discomfort.

[0007] The present invention has been made in view of such a point, and an object of the present invention is to prevent a decrease in comfort by controlling the amount of air blown out after the start of operation.

[0008]

According to the present invention, the amount of air blown out is gradually increased after the start of operation.

Specifically, in the first invention, the compressor (21), the heat source side heat exchanger (23), the expansion mechanism (44), and the use side heat exchanger (31) are connected, and the refrigerant is Circulating refrigerant circuit (1
It is intended for air conditioners equipped with 1). And
After the start of the operation, the air volume blown out from the use side heat exchanger (31) is gradually increased to the set air volume.

In the second invention, the compressor (21), the heat source side heat exchanger (23), the expansion mechanism (44), and the use side heat exchanger (31) are connected, and the refrigerant circulates. Refrigerant circuit (11)
And a use side fan (32) that blows out the air that has exchanged heat with the refrigerant in the use side heat exchanger (31), and is directed to an air conditioner that blows out at least hot air. Then, when the operation starts, the use side fan (3
An initial adjustment means (65) for increasing the number of revolutions in 2) stepwise to the set number of revolutions is provided.

According to a third aspect of the present invention, the compressor (21), the heat source side heat exchanger (23), the expansion mechanism (44), and the use side heat exchanger (31) are connected, and the refrigerant circulates. Refrigerant circuit (11)
And a use side fan (32) for blowing out the air that has exchanged heat with the refrigerant in the use side heat exchanger (31). When the operation is started, after driving the use side fan (32) at a preset minimum rotation speed, the refrigerant temperature of the use side heat exchanger (31) becomes higher than a predetermined value, and When the temperature difference between the refrigerant temperature of the heat exchanger (31) and the temperature of the air-conditioned space becomes larger than a predetermined value, the temperature at which the rotation speed of the use side fan (32) is increased to a predetermined intermediate rotation speed higher than the minimum rotation speed. An air volume control means (62) is provided. Further, when the use side fan (32) is driven at an intermediate rotation speed, a time air volume control means (63) is provided which gradually increases the rotation speed of the use side fan (32) to a set rotation speed as time elapses. I have.

[0012] In a fourth aspect based on the third aspect, the temperature / air flow rate control means (62) controls the rotation speed of the use-side fan (32) by a predetermined time after the start of operation. A starting air volume control means (64) is provided for increasing the rotation speed of the use side fan (32) to the intermediate rotation speed unless the rotation speed is increased to the intermediate rotation speed.

A fifth aspect of the present invention provides a refrigerant in which a compressor (21), a heat source side heat exchanger (23), an expansion mechanism (44), and a use side heat exchanger (31) are connected to circulate the refrigerant. Circuit (11)
And a use-side fan (32) that blows out air that has exchanged heat with the refrigerant of the use-side heat exchanger (31), and is intended for an air conditioner that blows out at least warm air. Then, when the operation is started, the air volume increasing means for increasing the rotational speed of the use side fan (32) stepwise to a set rotational speed based on the high pressure equivalent saturation temperature derived from the high pressure of the refrigerant circuit (11). (66).

[0014] In a sixth aspect based on the fifth aspect, the air volume increasing means (66) is provided after the operation is started.
When the high pressure equivalent temperature rises to the set temperature, the use side fan (32) is started at a minimum rotation speed from a stopped state,
When the high temperature equivalent temperature rises above a set temperature, the rotational speed of the use side fan (32) is increased for each predetermined increase in the high temperature equivalent saturation temperature.

That is, in the first invention, when the operation is started, as the refrigerant temperature of the use side heat exchanger (31) gradually increases, the temperature of the air that has exchanged heat in the use side heat exchanger (31) is increased. Gradually rises. On the other hand, the air volume blown out from the use side heat exchanger (31) gradually increases to the set air volume. Therefore, as the air warms, the amount of blown air increases.

According to the second aspect of the present invention, when the operation is started, as the refrigerant temperature of the use side heat exchanger (31) gradually increases, the temperature of the air heat exchanged in the use side heat exchanger (31) is increased. Gradually rises. On the other hand, the rotation speed of the usage-side fan (32) gradually increases to the set rotation speed, and the amount of blown air gradually increases. Therefore, as the air warms, the amount of blown air increases.

According to the third aspect of the present invention, when the operation is started, the usage-side fan (32) operates at a preset minimum rotation speed.
Drives. Thereafter, the refrigerant temperature of the use-side heat exchanger (31) gradually increases, and the temperature difference between the refrigerant temperature of the use-side heat exchanger (31) and the temperature of the air-conditioned space gradually increases. When the refrigerant temperature of the use side heat exchanger (31) becomes higher than a predetermined value and the temperature difference between the refrigerant temperature of the use side heat exchanger (31) and the temperature of the air-conditioned space becomes larger than a predetermined value, the use side fan ( 32) The rotation speed increases from the minimum rotation speed to the intermediate rotation speed. Thereafter, while the temperature of the air that has exchanged heat in the use-side heat exchanger (31) gradually increases, the rotation speed of the use-side fan (32) gradually increases to the set rotation number with the passage of time. Therefore, as the air warms, the amount of blown air increases.

In the fourth aspect of the present invention, in the third aspect of the present invention, the utilization is not performed until a predetermined time elapses after the start of operation, for example, when the indoor temperature at the start of operation is considerably low. Even when the refrigerant temperature of the side heat exchanger (31) does not become higher than a predetermined value, or when the temperature difference between the refrigerant temperature of the use side heat exchanger (31) and the temperature of the air conditioning space does not become larger than the predetermined value, the operation is performed. When a predetermined time elapses after
The rotation speed of the usage-side fan (32) increases to the intermediate rotation speed.
Thereafter, the temperature of the air that has exchanged heat in the use-side heat exchanger (31) gradually increases, and the rotation speed of the use-side fan (32) gradually increases to the set rotation number with time. Therefore, as the air warms, the amount of blown air increases.

In the fifth invention, when the operation is started, when the high-pressure equivalent temperature, which is the refrigerant temperature of the use-side heat exchanger (31), rises, the use-side fan (32) starts rotating. Thereafter, the rotation speed of the usage-side fan (32) is gradually increased. That is, in the sixth aspect, the rotation speed of the use-side fan (32) gradually increases for each predetermined increase in the high-pressure-pressure-equivalent saturation temperature, and the amount of blown air gradually increases. Therefore, blowing of the cool air is reliably suppressed.

[0020]

Therefore, according to the above-mentioned invention, since the air volume blown out from the use side heat exchanger (31) is gradually increased to the set air volume, the cold air of the set air volume blows out immediately after starting the operation. Can be prevented. As a result, for example, it is possible to prevent a person in the room from feeling uncomfortable, and it is possible to improve comfort.

According to the third aspect, when the temperature of the air-conditioned space is relatively high and the temperature of the blown air is close to the temperature of the air-conditioned space, the blown air may not feel warm. This can be reliably prevented.

Further, according to the fourth aspect, even when the predetermined condition is not satisfied within the predetermined time, the rotation speed of the usage-side fan (32) is increased to the intermediate rotation speed when the predetermined time has elapsed. Therefore, it is possible to prevent, for example, a person in the room from feeling uncomfortable without air conditioning at all, and to improve comfort.

According to the fifth and sixth aspects of the present invention,
Since the air volume is increased along with the increase of the high pressure equivalent temperature, it is possible to reliably prevent a decrease in the blown air temperature after the start of the indoor fan (32), and to improve comfort.

Further, since the indoor fan (32) is controlled by the saturation temperature corresponding to the high pressure derived from the high pressure, the detection by the temperature sensor can be prevented from being delayed. Furthermore, erroneous detection by the temperature sensor can be reliably prevented during supercooling of the refrigerant due to overfilling of the refrigerant. As a result, the indoor fan (32) can be controlled with high accuracy, so that comfort can be reliably improved.

[0025]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the air conditioner (10) of the present embodiment includes an outdoor unit (20) and an indoor unit (3).
0) is connected to a so-called separate type air conditioner.

The outdoor unit (20) includes a compressor (21)
And a four-way switching valve (22), an outdoor heat exchanger (23), an auxiliary heat exchanger (24), and an expansion circuit (25).

The indoor unit (30) is provided with an indoor heat exchanger (31) and an indoor fan (32) for blowing air, which has exchanged heat with refrigerant in the indoor heat exchanger (31), into the room. ing.

The compressor (21), the four-way switching valve (22), the outdoor heat exchanger (23), the auxiliary heat exchanger (24), and the expansion circuit (2)
5) and the indoor heat exchanger (31) are connected in sequence to form a refrigerant circuit (11) through which the refrigerant circulates. The refrigerant circuit (11) is configured to switch between a cooling operation (refrigeration cycle operation) and a heating operation (heat pump operation).

The outdoor unit (20) and the indoor unit (30) are connected by a liquid side pipe (12) and a gas side pipe (13). The liquid side pipe (12) connects the expansion circuit (25) and the indoor heat exchanger (31). Gas side piping (1
3) connects the four-way switching valve (22) and the indoor heat exchanger (31).

The compressor (21) is configured as a scroll-type compressor and includes an electric motor (21a). The electric motor (21a) is configured to change the operating capacity of the compressor (21) by changing the rotation speed.
A discharge pipe (26) is connected to the discharge side of the compressor (21), and a suction pipe (27) is connected to the suction side.

The four-way switching valve (22) includes a refrigerant circuit (11)
Is switched between a refrigeration cycle operation and a heat pump operation.

The outdoor heat exchanger (23) and the auxiliary heat exchanger (24) constitute a heat source side heat exchanger, and are configured to exchange heat between outdoor air and a refrigerant. The outdoor heat exchanger (23) includes an outdoor fan (28).

The expansion circuit (25) includes a direction control circuit (41) composed of a bridge circuit, and a direction control circuit (4).
It is constituted by a one-way passage (42) connected to 1). The direction control circuit (41) is configured to guide the refrigerant from the outdoor heat exchanger (23) to the one-way passage (42) during the cooling operation and the refrigerant from the indoor heat exchanger (31) during the heating operation. Have been.

In the one-way passage (42), a receiver (4) which is located upstream and discharges the refrigerant while storing the refrigerant.
3) and a motor-operated expansion valve (44) located downstream thereof and whose opening can be adjusted are arranged in series. Electric expansion valve (44)
Constitute the expansion mechanism.

The one-way passage (42) is provided between the receiver (43) and the motor-operated expansion valve (44) by the compressor (2).
Liquid seal prevention passage (4)
6), it is connected to the discharge pipe (26) of the compressor (21). A check valve (47) that allows the refrigerant to flow from the one-way passage (42) to the discharge pipe (26) is provided in the liquid seal prevention passage (46).

The direction control circuit (41) includes a first inflow path (48), a first outflow path (49), a second inflow path (50),
The second outflow passage (51) is connected in a bridge shape. A check valve (CV) is provided in each inflow path and each outflow path.

The first inflow path (48) is connected from the first connection point (52) to which the outdoor heat exchanger (23) is connected to the second connection point (53) to which the upstream end of the one-way passage is connected. To form a refrigerant flow toward The first outflow path (49) is connected to a third connection point (54) to which the downstream end of the one-way path (42) is connected.
From the fourth connection point (5) to which the indoor heat exchanger (31) is connected.
A refrigerant flow toward 5) is formed.

The second inflow path (50) is connected to the fourth connection point (5
A refrigerant flow from 5) to the second connection point (53) is formed. The second outflow path (51) is connected to the third connection point (5
A refrigerant flow from 4) to the first connection point (52) is formed.

The electric expansion valve (44) in the upper part of the receiver (43) and the one-way passage (42) which is always a low-pressure liquid pipe.
A bypass passage (56) is connected to a further downstream side. An electromagnetic valve (57) is provided in the bypass passage (56), and is configured so that gas refrigerant in the receiver (43) can be discharged.

The indoor heat exchanger (31) constitutes a use side heat exchanger, and is configured to exchange heat between indoor air and a refrigerant.

The indoor fan (32) is configured so that it can be set to four stages of rotation speed. This 4
The stages are four stages of a minimum rotation speed LL that hardly blows wind into the room, a low rotation speed L that is an intermediate rotation speed, a medium rotation speed M, and a high rotation speed H that is a maximum rotation speed.

The discharge pipe (26) of the compressor (21) is provided with a discharge pipe temperature sensor (Td) for detecting the discharge pipe temperature of the compressor (21). An outdoor temperature sensor (To) for detecting an outdoor temperature is disposed at an air inlet of the outdoor unit (20), and a refrigerant flowing through the outdoor heat exchanger (23) is provided at the outdoor heat exchanger (23). An outdoor heat exchange temperature sensor (Te) for detecting the outdoor heat exchange temperature, which is the temperature of the outdoor heat exchange temperature, is disposed.
Further, an indoor temperature sensor (Tr) for detecting an indoor temperature tr is arranged at an air inlet of the indoor unit (30),
The indoor heat exchanger (31) has a temperature of the refrigerant flowing through the indoor heat exchanger (31), and has an evaporation temperature during a cooling operation,
An indoor heat exchange temperature sensor (Tc) that detects an indoor heat exchange temperature tc that is a condensing temperature during the heating operation is arranged.

A high pressure control pressure sensor (HS) for detecting the pressure on the discharge side of the compressor (21) is arranged in the discharge pipe (26) of the compressor (21).

Each of the above temperature sensors (Td, To, Te, Tr, Tc)
The output signal of the high-pressure control pressure sensor (HS) is input to the controller (60). The controller (60)
An operation control unit (61), a temperature air flow control unit (62), a time air flow control unit (63), and a start air flow control unit (64) are provided.

The operation control section (61) is provided with an inverter circuit (not shown). After the operation is started, the operation control section (61) increases the output frequency of the inverter circuit in a stepwise manner, so that the motor (21a)
An operation control means for increasing the rotational speed of the compressor in a stepwise manner and increasing the operation capacity of the compressor (21) in a stepwise manner. Specifically, as shown in FIG. 2B, the operation control unit (61) sets the operation capacity to 40% of the maximum capacity for 3 to 5 minutes after the start of the operation, and then sets the operation capacity to It is configured so that the capacity is increased stepwise every 30 seconds and the maximum capacity is reached in ten or more steps.

The operation control section (61) adjusts the output frequency of the inverter circuit based on the air-conditioning load during the air-conditioning operation, while the outdoor heat exchange temperature sensor (Te) and the indoor heat exchange temperature sensor (Tc). ) Calculates the optimum value of the discharge pipe temperature that gives the optimum refrigeration effect from the refrigerant temperature detected by the electric expansion valve (44) so that the discharge pipe temperature becomes the optimum value.
It is configured to adjust the opening degree.

The temperature air volume control section (62) constitutes a temperature air volume control means. That is, when the operation is started, the temperature and air volume control unit (62) rotates the indoor fan (32) at an extremely low rotational speed LL that hardly blows air into the room, and then the indoor heat exchange temperature tc is 34 ° C. When the temperature is higher and the temperature difference tc−tr between the indoor heat exchange temperature tc and the indoor temperature tr is greater than 11 ° C., the rotation speed of the indoor fan (32) is reduced to the low rotation speed L.
It is configured to increase.

The starting air flow control section (64) constitutes starting air flow control means. That is, the starting air volume control unit (64) does not cause the temperature air volume control unit (62) to increase the rotation speed of the indoor fan (32) to the low rotation speed L until the predetermined time elapses after the operation is started. Sometimes, the indoor fan (3
It is configured to increase the rotation speed of 2) to a low rotation speed L. Specifically, the start-up air flow control unit (64) determines that the indoor heat exchange temperature tc is 34
If the temperature does not become higher than 0 ° C., or if the temperature difference tc−tr between the indoor heat exchange temperature tc and the indoor temperature tr does not become larger than 11 ° C., the indoor fan (32) Is increased to a low rotational speed L. That is, it is prevented that the indoor air conditioning operation does not start at all because the predetermined condition is not satisfied. Note that the waiting time until the compressor (21) is restarted after it has once stopped is 3
In consideration of the time, the elapsed time until the air blows out when the predetermined condition is not satisfied in the indoor fan (32) is set to 3 minutes.

The time air flow control section (63) constitutes a time air flow control means, and after the rotational speed of the indoor fan (32) increases to a low rotational speed L, the indoor fan (32)
Is configured to increase the number of revolutions in a stepwise manner.
Specifically, the time air volume control unit (63) determines the indoor heat exchange temperature.
tc is higher than 34 ° C, and indoor heat exchange temperature tc and indoor temperature tr
And the elapsed time since the rotation speed of the indoor fan (32) increased to the low rotation speed L when the temperature difference tc-tr from
When t1 exceeds one minute, the rotation speed of the indoor fan (32) is increased to the middle rotation speed M. In addition, the time air volume control unit (63) performs the operation when the indoor heat exchange temperature tc is not higher than 34 ° C. or when the temperature difference tc−tr between the indoor heat exchange temperature tc and the indoor temperature tr is not higher than 11 ° C. If the elapsed time t1 after the rotation speed of the indoor fan (32) increases to the low rotation speed L exceeds 2 minutes, the indoor fan (32)
Is increased to the medium rotation speed M.

The time air volume control unit (63) determines that the indoor heat exchange temperature tc is higher than 34 ° C.
If the temperature difference tc−tr from tr is greater than 11 ° C. and the elapsed time t2 after the rotation speed of the indoor fan (32) increases to the medium rotation speed M exceeds 1 minute, the indoor fan (32) It is configured to increase the rotation speed to a high rotation speed H. In addition, the time air volume control unit (63) determines whether the indoor heat exchange temperature tc is not higher than 34 ° C.
When the temperature difference tc−tr from the indoor fan (32) does not become larger than 11 ° C. and the elapsed time t2 after the rotation speed of the indoor fan (32) increases to the medium rotation speed M exceeds 3 minutes, the indoor fan (3
The rotation speed of 2) is increased to a high rotation speed H.

That is, if the operating capacity increases stepwise every 30 seconds after 3 to 5 minutes have elapsed since the start of the compressor (21), the degree of increase in the indoor heat exchange temperature tc increases, so that the operating capacity increases. The configuration is such that the number of revolutions of the indoor fan (32) is increased substantially in accordance with the increasing timing.

When the temperature air volume control unit (62), the time air volume control unit (63), and the starting air volume control unit (64) start operation, the rotational speed of the indoor fan (32) is increased stepwise to the set rotational speed. The initial adjusting means (65) is configured to be raised.

-Operating operation- A specific operating operation of the air conditioner (10) will be described.

First, the circulation operation of the refrigerant will be described.
During the cooling operation, the four-way switching valve (22) switches to the connection shown by the solid line in FIG.

The refrigerant discharged from the compressor (21) passes through the four-way switching valve (22), flows into the outdoor heat exchanger (23) and the auxiliary heat exchanger (24), and exchanges outdoor air with heat. Exchange and condense. The condensed refrigerant passes through the first inflow path (48), is temporarily stored in the receiver (43), and is then stored in the one-way path (42).
And the pressure is reduced by the electric expansion valve (44). Thereafter, the refrigerant flows into the indoor heat exchanger (31), cools the indoor air and evaporates, and flows into the outdoor unit (20). The refrigerant flowing into the outdoor unit (20) is supplied to the compressor (2
Inhaled in 1), this circulation is repeated.

On the other hand, during the heating operation, the four-way switching valve (22) switches to the connection shown by the broken line in FIG.

The refrigerant discharged from the compressor (21) passes through the four-way switching valve (22) and flows into the indoor heat exchanger (31).
The room is heated and condensed. The condensed refrigerant flows into the outdoor unit (20), flows through the second inflow path (50), is temporarily stored in the receiver (43), flows out of the one-way passage (42), and flows out of the electric expansion valve (44). To reduce the pressure. Thereafter, the refrigerant flows into the auxiliary heat exchanger (24) and the outdoor heat exchanger (23) through the second outflow path (51), exchanges heat with outdoor air, evaporates, and is sucked into the compressor (21). This cycle is repeated.

During the cooling operation and the heating operation,
The operation control unit (61) adjusts the output frequency of the inverter circuit based on the air conditioning load, and optimizes the refrigeration based on the refrigerant temperatures detected by the outdoor heat exchange temperature sensor (Te) and the indoor heat exchange temperature sensor (Tc). The optimum value of the discharge pipe temperature that gives an effect is calculated, and the opening of the electric expansion valve (44) is controlled so that the discharge pipe temperature becomes the optimum value.

Next, the control operation of the indoor fan (32) and the compressor (21) after the start of the heating operation will be described with reference to FIG.
This will be described with reference to FIG. The case where the set rotation speed of the indoor fan (32) is the high rotation speed H will be described.
In this case, the operation of increasing the rotation speed to each set rotation speed is the same.

First, at the start of the heating operation, the compressor (2
Assuming that the operating capacity of 1) is 40% of the maximum capacity, the compressor (2
1) is started, and the indoor fan (32) is driven at an extremely low rotational speed LL where the wind is scarce. Then, the operation is continued while maintaining the operation capacity at 40%, and when 3 to 5 minutes have elapsed after the start of the operation, the output frequency of the inverter circuit increases stepwise, so that the rotation speed of the electric motor (21a) increases stepwise. And the operating capacity gradually increases.

On the other hand, after the start of operation, as the pressure on the discharge side of the compressor (21) gradually increases, the indoor heat exchange temperature tc
Gradually rises. When the indoor heat exchange temperature tc is higher than 34 ° C. and the temperature difference tc−tr between the indoor heat exchange temperature tc and the indoor temperature tr is higher than 11 ° C., the indoor fan (32)
Increases to a low rotation speed L which is an intermediate rotation speed, and a small amount of wind blows into the room.

When the operation is continued thereafter, the compressor (21)
Indoor heat exchange temperature as the operating capacity of
Since tc gradually increases, the temperature of the air passing through the indoor heat exchanger (31) also gradually increases, and the temperature difference tc-tr between the indoor heat exchange temperature tc and the indoor temperature tr also gradually increases. Elapsed time since the rotation speed of the indoor fan (32) rose to the low rotation speed L
When t1 exceeds one minute, the rotation speed of the indoor fan (32) increases to the middle rotation speed M, and the amount of blown air increases.

Thereafter, the operating capacity of the compressor (21) further increases and the indoor heat exchange temperature tc further increases, so that the temperature of the air passing through the indoor heat exchanger (31) further increases.
The temperature difference tc-tr between the indoor heat exchange temperature tc and the indoor temperature tr further increases. If the elapsed time t2 after the rotation speed of the indoor fan (32) rises to the middle rotation speed M exceeds 1 minute, the rotation speed of the indoor fan (32) rises to the high rotation speed H, and the air with the maximum air volume is blown into the room. Blow out. That is, as the indoor heat exchange temperature tc increases, the temperature of the blown air increases and the blown air volume increases.

On the other hand, if the indoor heat exchange temperature tc does not become higher than 34 ° C. by three minutes after the start of operation, or if the temperature difference tc−tr between the indoor heat exchange temperature tc and the indoor temperature tr is 11
If the temperature does not exceed ℃, the start-up air volume control unit (64) will operate the indoor fan (3) three minutes after the start of operation.
2) The rotation speed is increased from the extremely low rotation speed LL to the low rotation speed L. In other words, even when the indoor heat exchange temperature tc and the temperature difference tc-tr hardly reach the predetermined values because the indoor temperature at the start of operation is considerably low, the indoor heat exchange temperature is increased with the increase in the operation capacity. Since tc rises, indoor fan (32)
Is increased from the extremely low speed LL to the low speed L to prevent the room from being heated at all.

If the indoor heat exchange temperature tc still does not become higher than 34 ° C., or if the temperature difference tc−tr between the indoor heat exchange temperature tc and the indoor temperature tr does not become higher than 11 ° C., the indoor fan (32) If the elapsed time t1 after the rotation speed of the indoor fan (32) increases to the low rotation speed L exceeds 2 minutes, the rotation speed of the indoor fan (32) increases to the middle rotation speed M. That is, since the indoor temperature at the start of operation is considerably low, the indoor heat exchange temperature tc and the temperature difference tc−
When tr does not easily reach the predetermined value, the degree of increase in the indoor heat exchange temperature tc is small, and thus the air volume is increased while delaying the timing of increasing the rotation speed of the indoor fan (32).

Further, when three minutes have elapsed since the start of operation, even when the rotational speed of the indoor fan (32) has increased to the low rotational speed L, the indoor heat exchange temperature tc is higher than 34 ° C. and the indoor heat exchange temperature is higher than 34 ° C. The temperature difference tc-tr between the temperature tc and the indoor temperature tr is greater than 11 ° C., and the rotation speed of the indoor fan (32) is low.
When the elapsed time t1 after going up exceeds 1 minute,
The rotation speed of the indoor fan (32) increases to the middle rotation speed M.

Thereafter, when the elapsed time t2 after the rotation speed of the indoor fan (32) has increased to the medium rotation speed M exceeds 3 minutes,
The rotation speed of the indoor fan (32) rises to the high rotation speed H, and the air with the maximum air volume blows out into the room.

-Effects of Embodiment 1- According to the present embodiment, the air volume blown out from the indoor heat exchanger (31) is gradually increased to the set air volume. Blowing out can be prevented. As a result, for example, it is possible to prevent a person in the room from feeling uncomfortable, and it is possible to improve comfort.

When the temperature of the blown air is close to the indoor temperature when the temperature of the room is relatively high, the blown air may not be felt warm, but this can be reliably prevented.

Even when the predetermined condition is not satisfied within the predetermined time, the indoor fan (32)
In order to increase the rotation speed of the
Without air conditioning at all, for example, it is possible to prevent a person in the room from feeling uncomfortable, and it is possible to improve comfort.

[0072]

Second Embodiment Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, the indoor fan is driven based on the condensation temperature instead of driving the indoor fan at the same time as the operation of the first embodiment and increasing the rotation speed stepwise. It is.

More specifically, the controller shown in FIG. 1 is replaced with an initial adjusting means (65) comprising a temperature air volume control unit (62), a time air volume control unit (63), and a starting air volume control unit (64).
As shown by a dashed line in FIG. Further, the high pressure control pressure sensor (HS) constitutes a condensation temperature detecting means for detecting a high pressure equivalent saturation temperature which is a condensation temperature. That is, the air volume increasing means (66)
Is configured to derive a condensation temperature which is a saturation temperature corresponding to a high pressure from a high pressure detected by a high pressure control pressure sensor (HS).

Further, when the heating operation is started, the air volume increasing means (66) gradually increases the rotation speed of the indoor fan (32) to the set rotation speed based on the condensation temperature which is the saturation temperature corresponding to the high pressure. It is configured as follows.

More specifically, the air volume increasing means (66)
After starting operation, when the condensation temperature rises to the set temperature,
Start the indoor fan (32) at the minimum speed from the stopped state,
When the condensing temperature rises above a set temperature, the number of revolutions of the indoor fan (32) is increased every predetermined increment of the condensing temperature.

Accordingly, the control operation of the indoor fan (32) after the start of the heating operation will be described with reference to FIGS. 3 (a), 3 (b) and 3 (c).
It will be described based on.

First, when the heating operation is started (see the point B in FIG. 3), the compressor (21) is started, so that the refrigerant circulates through the refrigerant circuit (11) and the condensing temperature, which is the saturated temperature corresponding to the high pressure, gradually increases. (See R1 in FIG. 3A). At the start of the heating operation, the indoor fan has not been stopped yet, and the conditioned air as warm air has not been blown out.

Thereafter, when the operating capacity of the compressor (21) increases and the condensing temperature rises to the set temperature, for example, 35 ° C.
(See point C in FIG. 3), the indoor fan (32) is driven at the extremely low rotational speed LL (see F1 in FIG. 3B), and blown air having a predetermined air temperature is blown out (see FIG. c) S
1).

When the indoor fan (32) is driven, the refrigerant in the indoor heat exchanger exchanges heat with the air, so that the condensation temperature temporarily drops (see R2 in FIG. 3A), and the blown air temperature also drops once. (See S2 in FIG. 3C). Thereafter, as the operating capacity of the compressor (21) increases, the condensing temperature rises, and the temperature of the blown air also rises.

Subsequently, when the condensing temperature rises above the set temperature and rises to a temperature obtained by adding a predetermined rise amount to the set temperature, for example, to 40 ° C. (see point D in FIG. 3), the indoor fan (32) ) Increases to a low rotational speed L (F in FIG. 3B).
2), and blown air having a predetermined air temperature is blown out (see S3 in FIG. 3C).

Thereafter, as the rotational speed of the indoor fan (32) increases, the condensing temperature once lowers again (see R3 in FIG. 3A), and the blown air temperature also lowers once (FIG. 3C). Then, the condensation temperature rises again, and the blown air temperature rises again.

Further, when the condensing temperature rises by a predetermined rise amount, for example, to 45 ° C. (see the point E in FIG. 3), the indoor fan (32) increases to a high rotation speed H (FIG. 3).
(Refer to F3 in FIG. 3B), and blown air having a predetermined air temperature is blown out (refer to S5 in FIG. 3C). Thereby, the operation start control of the indoor fan (32) ends, and the process shifts to the normal control.

The reason why the indoor fan (32) is raised stepwise will now be described.

When the condensing temperature rises to the set temperature (see the point C in FIG. 3), when the indoor fan (32) is driven at a high rotation speed H (see the broken line in FIG. 3B), the condensing temperature is greatly reduced (see FIG. 3B). FIG. 3A shows a broken line, and the temperature of the blown air is also greatly reduced (see a broken line in FIG. 3C). As a result, the cool air blows out and the comfort is impaired. Therefore, as described above, the indoor fan (32) is raised stepwise as the condensation temperature rises.

-Effects of Embodiment 2- According to this embodiment, the air volume blown out from the indoor heat exchanger (31) is gradually increased to the set air volume as the condensing temperature rises. It is possible to prevent the cool air of the set air volume from blowing out. As a result, for example, it is possible to prevent a person in the room from feeling uncomfortable, and it is possible to improve comfort.

In particular, since the air volume is increased along with the increase in the condensing temperature, it is possible to reliably prevent a decrease in the temperature of the blown air after the start of the indoor fan (32), thereby improving comfort.

Further, since the indoor fan (32) is controlled by the high-pressure control equivalent saturation temperature based on the high-pressure control pressure sensor (HS), the detection delay by the temperature sensor can be prevented. Furthermore, erroneous detection by the temperature sensor can be reliably prevented during supercooling of the refrigerant due to overfilling of the refrigerant. As a result, the indoor fan (32) can be controlled with high accuracy, so that comfort can be reliably improved.

[0089]

According to another embodiment of the present invention, in the first embodiment, the controller (60) includes a starting air volume control unit (64).
May be omitted.

The indoor fan (32) in the first and second embodiments is not limited to the configuration in which the number of rotations is set to four or three. That is, the number of rotations of the indoor fan (32) may be set to five or more stages or four or more stages.

Further, the air conditioner may be a heating only machine.

In the second embodiment, the high pressure equivalent saturation temperature is derived from the high pressure detected by the high pressure control pressure sensor (HS). However, the high pressure of the present invention may be predicted from the operating current of the compressor (21). That is, the air volume increasing means (66) of the present invention predicts the high pressure from the operating current of the compressor (21), and derives the high pressure equivalent saturation temperature which is the condensation temperature from the predicted high pressure. Good.

[Brief description of the drawings]

FIG. 1 is a refrigerant system diagram of an air conditioner according to the present invention.

FIG. 2A is a characteristic diagram illustrating a change in a rotation speed of an indoor fan of the air-conditioning apparatus according to Embodiment 1. (B) is a characteristic diagram showing a change in the operating capacity of the compressor of the air-conditioning apparatus according to Embodiment 1.

FIG. 3 is a characteristic diagram showing changes in a compressor capacity, a rotation speed of an indoor fan, and an indoor temperature of the air-conditioning apparatus according to Embodiment 2.

FIG. 4 is a characteristic diagram showing a change in the rotation speed of an indoor fan of a conventional air conditioner.

[Explanation of symbols]

 11 Refrigerant circuit 21 Compressor 23 Outdoor heat exchanger 24 Auxiliary heat exchanger 31 Indoor heat exchanger 32 Indoor fan 44 Electric expansion valve 62 Temperature airflow control unit 63 Hour airflow control unit 64 Start-up airflow control unit 65 Initial adjustment means 66 Airflow increase Means (66)

Continued on the front page (72) Inventor Junichi Shimoda 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside the Kanaoka Plant of Sakai Seisakusho Co., Ltd. (72) Inventor 100 ▲ Saki ▼ Shin 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. 3L060 AA06 CC02 CC04 CC08 CC09 CC19 DD02 EE05 3L061 BE03 BF02 BF04 BF08

Claims (6)

[Claims] 1. A refrigerant circuit (11) in which a compressor (21), a heat source side heat exchanger (23), an expansion mechanism (44), and a use side heat exchanger (31) are connected and a refrigerant circulates. An air conditioner according to claim 1, characterized in that after start of operation, the amount of air blown out from said use side heat exchanger (31) is gradually increased to a set amount of air. 2. A refrigerant circuit (11) in which a compressor (21), a heat source side heat exchanger (23), an expansion mechanism (44), and a use side heat exchanger (31) are connected and a refrigerant circulates. An air conditioner that blows out hot air at least when the air conditioner is provided with a use side fan (32) that blows air that has exchanged heat with the refrigerant of the use side heat exchanger (31). Drive)
An air conditioner comprising an initial adjusting means (65) for increasing the rotation speed of the use side fan (32) stepwise to a set rotation speed. 3. A refrigerant circuit (11) in which a compressor (21), a heat source side heat exchanger (23), an expansion mechanism (44), and a use side heat exchanger (31) are connected and a refrigerant circulates. An air conditioner that includes a use side fan (32) that blows out the air that has exchanged heat with the refrigerant in the use side heat exchanger (31) and that blows at least hot air. After driving the use-side fan (32) by a number, the refrigerant temperature of the use-side heat exchanger (31) becomes higher than a predetermined value, and the refrigerant temperature of the use-side heat exchanger (31) and the air-conditioning space When the temperature difference from the temperature becomes larger than a predetermined value, the use side fan (32)
When the use-side fan (32) is driven at the intermediate rotation speed, the temperature-controlling means (62) for increasing the rotation speed of the use-side fan (32) to a predetermined intermediate rotation speed higher than the minimum rotation speed. 32. An air conditioner comprising: a time-volume control means (63) for gradually increasing the number of revolutions of 32) to a set number of revolutions. 4. The method according to claim 3, wherein the temperature / air volume control means (62) does not increase the rotation speed of the use-side fan (32) to the intermediate rotation speed by a predetermined time after the start of the operation. Starting air volume control means (64) for increasing the rotation speed of the use side fan (32) to the intermediate rotation speed.
An air conditioner comprising: 5. A refrigerant circuit (11) in which a compressor (21), a heat source side heat exchanger (23), an expansion mechanism (44), and a use side heat exchanger (31) are connected and a refrigerant circulates. An air conditioner that includes a use side fan (32) that blows air that has exchanged heat with the refrigerant of the use side heat exchanger (31), and that blows at least hot air. Air provided with air volume increasing means (66) for increasing the number of revolutions of the use side fan (32) stepwise to a set number of revolutions based on a high temperature equivalent saturation temperature derived from the high pressure of the air. Harmony equipment. 6. The air volume increasing means (66) according to claim 5, wherein, when the saturated temperature corresponding to the high-pressure pressure rises to a set temperature after the operation is started, the use-side fan (32) is rotated at a minimum speed from a stopped state. When the saturation temperature corresponding to the high-pressure pressure rises above the set temperature, the rotation speed of the usage-side fan (32) is increased for each predetermined increase in the saturation temperature corresponding to the high-pressure pressure. An air conditioner, characterized by: