JP2000088327A - Indoor machine for air conditioning and control method of outlet air temperature thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain an air outlet temperature at a comfortable temperature without feeling any cold air regardless of a cooling load by a method wherein the opening degree of a second air suction port is made changeable and air, introduced through the second air suction port, is guided to a fan without passing through a heat exchanger. SOLUTION: An indoor machine 1 is provided with a first air suction port 3 on the front surface of the same to suck air in an objective room for air conditioning through the first air suction port 3 by a fan 5 while the sucked air is passed through a heat exchanger 4 and is introduced into the fan 5. Further, the indoor machine 1 is provided with a second air suction port 10 equipped with a damper 12 on the upper surface of the same, while the second air suction port 10 is defined from the first air suction port 3 through a bulkhead 13 to introduce air, sucked through the second air suction port 10, directly into the fan 5 while bypassing the heat exchanger 4. According to this method, the ventilation of air having a comfortable temperature while securing a cooling capacity in accordance with the cooling load is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor unit of an air conditioner, and more particularly to an indoor unit capable of controlling a comfortable blowing temperature without a feeling of cool air.

[0002]

2. Description of the Related Art In the case of cooling by a conventional air conditioner,
Taking a direct expansion method as an example, as shown in FIG. It is. In this case, the blowing temperature is usually 12 to 15 ° C.
Low, it can cause discomfort when cold air hits the human body directly. For this reason, it is necessary to adjust the wind direction by the wind direction changing plate 53 so that the cold wind does not directly hit the human body. This is the same even in the case of the cold water circulation system.

[0003] As a method for raising the blast temperature to a level not to be too cold, when the difference between the room temperature and the set temperature is equal to or less than a predetermined value, a part of the air to be conditioned taken in from the fan is bypassed to the heat exchanger. A technique is known in which the air is guided to an air outlet and mixed with air that has passed through a heat exchanger near the air outlet (Japanese Patent Laid-Open No. 4-169734).

However, in this method, a part of the air to be air-conditioned, which is sucked in from the fan, is bypassed through the heat exchanger only when the temperature difference between the room temperature and the set temperature is small. Do not bypass if the load is heavy. This is because, if the bypass flow path is opened when the air conditioning load is large, the flow rate passing through the heat exchanger is reduced, and the cooling capacity is reduced. As a result, cold air having a low temperature of about 12 to 15 ° C. is blown from the outlet. In this case, if the air flow rate is increased in a state where the bypass flow path is closed in order to increase the blowing temperature, the flow rate of the air passing through the heat exchanger having a large flow path resistance increases,
The problem of noise arises.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a blown air temperature that is comfortable without a feeling of cool air irrespective of the cooling load. It is an object of the present invention to provide an air conditioner indoor unit having a mechanism for maintaining the air temperature and a method for controlling the blow-out temperature.

[0006]

The present invention is characterized in that the above object is achieved by the technical means described below.

According to the first aspect of the present invention, there is provided a first suction port and a second suction port for introducing air to be air-conditioned in a room into a machine, a heat exchanger for exchanging heat of the introduced air with a refrigerant, and An air conditioner indoor unit having a blower returning to the room,
The second suction port is an air conditioning indoor unit configured to have a variable opening degree and to guide air introduced from the second suction port to the blower without passing through the heat exchanger.

According to a second aspect of the present invention, the blower temperature is controlled by changing the number of air to be introduced by changing the number of rotations of the blower, further comprising a means for controlling the number of rotations of the blower. An air conditioner indoor unit characterized in that it is configured as described above.

According to a third aspect of the present invention, the blowout temperature is controlled by changing the rotation speed of the blower and changing the amount of air introduced by changing the degree of opening of the second suction port. An indoor unit for air conditioning characterized by comprising.

According to a fourth aspect of the present invention, in addition to the above-mentioned invention, a suction temperature sensor and a blow-out temperature sensor are further provided, and the rotation speed control means of the blower controls a temperature difference between the blow-out temperature and the set room temperature, and a second temperature difference. An air conditioner indoor unit characterized in that the number of revolutions of the blower is controlled based on the opening degree of the suction port.

In this case, the rotation speed control means is provided with diagram data indicating the relationship between the temperature difference between the blowout temperature and the set room temperature and the rotation speed of the blower, using the degree of opening of the second suction port as a parameter. What can be used (claim 5).

According to a sixth aspect of the present invention, a first suction port for introducing air to be air-conditioned in a room and a second suction port having a variable opening degree, and heat exchange between the introduced air and a refrigerant. A heat exchanger for causing the air introduced from the second suction port to bypass the heat exchanger,
In an air-conditioning indoor unit including a blower and an outlet for returning introduced air to a room, mixing air introduced from the first suction port and air introduced from the second suction port. This is a method of controlling the blow-out temperature of an indoor unit for air conditioning, which is guided to a blower, controlled to a desired blow-out temperature and returned to the room.

In this case, it is desirable to control the temperature of the blown air to 20 to 25 ° C. so as not to give a feeling of cool air.

According to an eighth aspect of the present invention, the blowout temperature is controlled by using a degree of opening of the second suction port as a parameter and showing a relationship between a temperature difference between the blowout temperature and a set room temperature, and a fan rotation speed. This is a method of controlling the blow-out temperature of an indoor unit for air conditioning, which is performed by controlling the number of revolutions of a blower based on data.

[0015]

The air to be air-conditioned introduced into the machine is partially passed through the heat exchanger and exchanged with the refrigerant flowing inside the heat exchanger to a low temperature of 12 to 15 ° C., and the remaining air is heat exchanger. And then both airs are mixed and blown by a blower. Thereby, even if the blowing temperature is directly applied to the human body, the temperature can be controlled to a comfortable level of about 20 to 25 ° C. without feeling the feeling of cool air.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an air conditioner indoor unit according to the present invention. In FIG. 1, an indoor unit 1 includes a heat exchanger 4 and a blower 5 inside a housing 2. The indoor unit 1 is connected to an outdoor unit (not shown) via a refrigerant pipe 6.
The cooling system of the outdoor unit used in the present invention may be either a direct expansion system or a chilled water circulation system. A first suction port 3 is provided on the front surface of the indoor unit 1, and indoor air to be air-conditioned is sucked from the first suction port 3 by the blower 5. The sucked air passes through the heat exchanger 4 and reaches the blower 5. At that time, the air gives heat to the refrigerant flowing inside the heat transfer tube 8 of the heat exchanger 4 and is cooled by itself. A temperature sensor 15 is provided near the suction port 3 inside the indoor unit 1, and is configured to detect a suction temperature, that is, a room temperature.

A second suction port 10 having a damper 12 is provided on the upper surface of the indoor unit 1. A drive device (not shown) such as a step motor is attached to the damper 12, and the opening degree of the damper is configured to be variable. By changing the opening degree, the amount of air suctioned from the suction port 10 can be increased or decreased. It has become. Suction port 3 and suction port 10
Are separated from each other by a partition 13, whereby the air sucked from the suction port 10 is guided to the blower 5 directly, bypassing the heat exchanger 4. On the other hand, the air sucked from the suction port 3 always passes through the heat exchanger 4 and is guided to the blower 5. The space between the heat exchanger 4 and the blower 5 is a mixing chamber 11, and the air sucked from the suction port 3 and the suction port 10 is mixed in the mixing chamber 11 to reach an appropriate temperature, and the temperature of the blower 5 To return to the room from the outlet 7. A temperature sensor 16 is provided in the vicinity of the outlet 7 so that the temperature of the blown air can be detected. Further, the blower 5 can control the amount of air to be blown in multiple stages or continuously. Although not shown, the indoor unit 1 includes a control unit for performing room temperature control, blowout temperature control, and the like by a microcomputer.

Next, the blow-off temperature control during cooling in the present embodiment will be described with reference to the flowcharts shown in FIGS.

At the start of the operation, the opening degree of the damper 12, the room temperature, the blowing temperature and the like are initialized (F-1). When the operation is started, the temperature of the indoor air sucked from the suction port 3 is detected by the suction temperature sensor 15 (F-2), and the refrigerant circulation amount is set by the outdoor unit (not shown) based on the difference from the set room temperature. Then, the refrigerant temperature is controlled (F-3). A specific control method is the same as that of a known air conditioner (air conditioner), and a description thereof will be omitted. The refrigerant is sent to the heat exchanger 4 of the indoor unit 1 via the refrigerant pipe 16.

Next, the blower 5 is detected by the blowout temperature sensor 16.
Is detected (F-4).
If the blowout temperature (t1) is lower than the set blowout temperature (t0), the opening of the damper 12 is checked (F-7), and then the damper opening is increased by a fixed amount (F-8). As a result, the amount of air sucked from the suction port 10 (by-pass flow rate) increases, and the outlet temperature tends to increase. However, if the damper is already fully opened (F-9), the fan speed control is performed in that state (F-13). When the blowout temperature (t1) is higher than the set blowout temperature (t0), the damper opening is reduced by a fixed amount (F-11). As a result, the ratio of the flow rate of air that bypasses the heat exchanger 4 decreases, so that the amount of air passing through the heat exchanger 4 relatively increases, and the blowout temperature tends to decrease. If the damper is already fully closed (F-12), the F-11 step is skipped and the fan speed control is performed (F-1).
3).

Next, control of the rotation speed of the blower 5 (F-1)
3) is performed as follows. The controller (not shown) of the indoor unit 1 stores diagram data of the fan rotation speed using the damper opening as a parameter with respect to the temperature difference between the suction temperature (T1) and the set room temperature (T0). I have. FIG. 3 is a diagram conceptually showing this. For example, when the temperature difference is ΔT and the damper opening is Θi, the fan rotation speed is R.

The above operations (F-1 to F-13) are constantly repeated during the operation of the indoor unit 1 to control the room temperature and the blow-out temperature.

In this embodiment, the number of rotations of the blower is controlled based on the temperature difference between the temperature detected by the outlet temperature sensor and the set room temperature using the degree of opening of the second suction port as a parameter. The control means is not necessarily limited to this. Appropriate factors can be selected to control the outlet temperature. For example, the number of rotations of the compressor of the outdoor unit, the temperature and pressure of the refrigerant, and the like.

In this embodiment, the second suction port 10 is provided on the upper surface of the indoor unit. However, the position of the second suction port is not limited to this, and the second suction port may be located on the front surface or the side surface. Further, the first suction port and the second suction port may be combined to form a single suction port. In short, it is important that a part of the sucked air be guided to the blower, bypassing the heat exchanger.

Further, in this embodiment, a rotary damper is used as the flow control device. However, the present invention is not limited to this, and any device having a variable opening degree such as a slide type may be used. Further, in the present embodiment, the control at the time of cooling has been described. However, if control of the blowout temperature is required at the time of heating, the control can be performed in the same manner as the control at the time of cooling.

[0026]

As described above, according to the present invention, the flow path of the air to be air-conditioned in the indoor unit is divided into the flow path passing through the heat exchanger to the blower and the blower without passing through the heat exchanger. The following effects can be achieved by being configured separately from the flow path leading to.

Since the cooling air that has passed through the heat exchanger and the room air that has bypassed the heat exchanger are mixed and sent, the air can be sent at a temperature that does not give a sense of cool air even when directly applied to the human body. For this reason, it is possible to apply a large amount of relatively high-temperature wind directly to the human body, such as a fan, to remove latent heat of evaporation from the skin, and to obtain a comfortable feeling even when the indoor temperature is relatively high. . In particular, when the blowing temperature is in the range of 20 to 25 ° C., it is most comfortable when applied directly to the human body. Also,
Since the temperature difference between indoor and outdoor can be reduced, it is good for health.

The cooling load can be reduced, contributing to energy saving.

Since the indoor air mixed with the cool air bypasses the heat exchanger, the increase in the work of the blower is smaller than the increase in the blown air amount, and the power consumption can be suppressed. In addition, an increase in noise can be suppressed.

In the apparatus for controlling the opening degree of the second suction port and the number of rotations of the blower in accordance with the set room temperature and the set blow-out temperature, air having a comfortable temperature is ensured while ensuring the cooling capacity corresponding to the cooling load. Can be blown.

The blower rotation speed control means includes diagram data showing the relationship between the blower rotation speed and the temperature difference between the blowout temperature and the set room temperature using the degree of opening of the second suction port as a parameter. It is possible to calculate the required amount of cold heat in advance and to operate, and to control the indoor environment appropriately and quickly.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of an indoor unit for air conditioning according to the present invention.

FIG. 2 is a diagram showing a flow of controlling the blown air temperature during cooling of the indoor unit for air conditioning according to the present invention.

FIG. 3 is a diagram showing a method for controlling the number of rotations of a blower of an indoor unit for air conditioning according to the present invention.

FIG. 4 is a diagram showing a conventional air conditioner indoor unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-conditioning indoor unit 2 Housing 3 First suction port 4 Heat exchanger 5 Blower 7 Blow-out port 10 Second suction port 12 Damper 15 Suction temperature sensor 16 Blow-out temperature sensor

Claims (8)

[Claims] 1. A first suction port and a second suction port for introducing air to be air-conditioned in a room into a machine, a heat exchanger for exchanging heat of the introduced air with a refrigerant, a blower, and returning the introduced air to the room. An air-conditioning indoor unit having an air outlet, wherein the second inlet is configured to have a variable opening degree, and the air introduced from the second inlet is passed through the heat exchanger. An indoor unit for air conditioning that is configured to be guided to the blower without passing through. 2. The air conditioner indoor unit according to claim 1,
The air-conditioning room further includes a rotation speed control unit of the blower, and is configured to control an outlet temperature by changing an amount of air introduced by changing a rotation speed of the blower. Machine. 3. The air-conditioning indoor unit according to claim 1, wherein an amount of air introduced by changing a rotation speed of said blower and changing an opening degree of said second suction port. An air conditioning indoor unit characterized in that the outlet temperature is controlled by changing the air temperature. 4. The indoor unit for air conditioning according to claim 2, wherein the rotation speed control means includes a temperature difference between the blowout temperature and a set room temperature, and an opening degree of the second suction port. An air-conditioning indoor unit characterized in that the number of rotations of the blower is controlled based on the following. 5. The rotation speed control means, using the degree of opening of the second suction port as a parameter, stores diagram data indicating a relationship between a temperature difference between an outlet temperature and a set room temperature and a rotation speed of the blower. The air conditioner indoor unit according to any one of claims 1 to 4, further comprising: 6. A first inlet for introducing air to be air-conditioned in a room and a second inlet having a variable opening degree, and a heat exchanger for exchanging the introduced air with a refrigerant. An air conditioner indoor unit comprising: a bypass passage that bypasses the heat exchanger with air introduced from the second suction port; a blower; and an outlet that returns introduced air to a room. The air introduced from one suction port and the air introduced from the second suction port are mixed and guided to a blower,
A blowing temperature control method for an indoor unit for air conditioning, characterized in that the temperature is controlled to an appropriate blowing temperature and air is blown into a room. 7. The method according to claim 6, wherein the temperature of the blown air is controlled to 20 to 25 ° C. 8. The control of the blowout temperature according to claim 6, wherein the control of the blowout temperature is based on a relationship between a temperature difference between the blowout temperature and a set room temperature and a rotation speed of the blower, with the degree of opening of the second suction port as a parameter. And controlling the number of revolutions of the blower on the basis of the diagram data indicating the blowout temperature.