JPH10318583A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner to block an excessive cooling effect, perform comfortable air-conditioning, and provide an increased life for a housing on an assumption that air-conditioning of the interior of a room and an underfloor space is practicable. SOLUTION: An indoor ventilation passage and an underfloor ventilation passage are provided, the indoor ventilation passage is provided with an indoor air outlet, and an indoor blower 12A and an indoor heat-exchanger 11A are arranged. An underfloor ventilation passage is provided with an underfloor air outlet and an underfloor blower 12B and an underfloor heat-exchanger 11B are arranged, and air-conditioning operation to effect switching of cooling and heating operation is effected. The indoor heat-exchanger and the underfloor heat-exchanger are connected together in parallel during a refrigerating cycle, and an electromagnetic on/off valve 21 to open and close a refrigerant channel is located at the inlet on the liquid side of the underfloor heat-exchanger. By selecting an underfloor blast switching mode during cooling operation, a control part 25 is provided so that an underfloor blower is operated and the electromagnetic opening closing valve is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning operation in which an indoor ventilation path and an under-floor ventilation path are provided, an air outlet is provided in each ventilation path, and a blower and a heat exchanger are arranged so that a cooling / heating operation can be switched. It relates to the air conditioner to make.

[0002]

2. Description of the Related Art Not only the air-conditioning function of a room,
An air conditioner that cools or heats a floor surface is known.
For example, Japanese Patent Publication No. 7-111265 discloses an indoor unit having an upper outlet at an upper portion and a lower outlet at a lower portion.
There is disclosed a technique for arbitrarily switching between upper and lower blowing in accordance with the output of the outside air temperature detecting means.

[0003] The cool air blown from the upper outlet is directly blown into the room to perform a cooling function. Further, the floor is cooled by being guided from the opening provided on the floor to the lower space of the double floor. The warm air blown out from the lower outlet is blown into the lower space of the double floor to form floor heating, and is further guided into an air-conditioned room through an opening provided on the floor to perform a cooling function.

[0004]

However, according to the above-mentioned technology, when cool air is passed under the floor, cold air leaks from the gap of the heat insulating material, and dew condensation easily occurs under the floor because the joists are cooled directly. It causes corrosion of joists and flooring.
If water is spilled near the floor surface outlet, the water will enter the underfloor space, mold the underfloor space or corrode building materials, and in any case, shorten the life of the house.

[0005] When the cooling operation is continued for a long time, the specific gravity of the cool air blown out of the floor is heavy, so that the cool air stays on the floor surface as it is and the cooling effect is excessive due to the floor surface radiation. A large temperature difference occurs in the vertical direction in the room, resulting in a very uncomfortable thermal environment in which the feet are cold and the head is hot.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a comfortable air conditioner while preventing an excessive cooling effect on the assumption that air conditioning can be performed in a room and under a floor. An object of the present invention is to provide an air conditioner that suppresses mold generation under the floor, suppresses corrosion of building materials, and extends the life of a house.

[0007]

Means for Solving the Problems In order to satisfy the above-mentioned object, the air conditioner of the present invention is provided with an indoor ventilation path and an underfloor ventilation path, and an indoor air outlet in the indoor ventilation path. A blower and a heat exchanger are arranged, and an underfloor air outlet is provided in the underfloor ventilation path, and a blower and a heat exchanger are arranged. A control means for controlling an underfloor ventilation switching operation mode in which only underfloor ventilation is performed without performing cooling and heating.

According to a second aspect, in the air conditioner according to the first aspect, the heat exchangers respectively arranged in the indoor ventilation passage and the underfloor ventilation passage are connected in parallel in a refrigeration cycle, and the underfloor heat exchanger is provided. An opening / closing valve for opening and closing the refrigerant flow path is provided at the liquid-side inlet of the exchanger, and by selecting the underfloor ventilation switching operation mode during the cooling operation, the control means operates the underfloor blower and opens / closes the opening / closing valve. Is controlled to be closed.

According to a third aspect of the present invention, in the air conditioner according to the first aspect, the heat exchangers respectively disposed in the indoor ventilation path and the underfloor ventilation path are configured such that the indoor heat exchanger and the underfloor heat exchange in the cooling operation mode. A control valve for adjusting the flow rate is provided between the indoor heat exchanger and the underfloor heat exchanger in the order of the heat exchangers, and by selecting the underfloor ventilation switching operation mode during the cooling operation, The control means operates the underfloor blower, and controls the degree of opening of the control valve for flow rate adjustment to superheat the refrigerant in the indoor heat exchanger.

[0010] Claim 4 is Claim 2 and Claim 3
In the air conditioner according to any one of the above, the indoor blower includes a cross flow fan, and the underfloor blower includes a centrifugal fan.

According to the first to fourth aspects of the present invention, by adopting means for solving the above-mentioned problems, an excessive cooling effect can be prevented to obtain comfortable air conditioning, and if necessary, The underfloor can be maintained in a dry state, and the generation of mold is suppressed, corrosion of building materials is prevented, and the life of the house is prolonged.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a side cross section of a room which is an air-conditioned room. In FIG. 1, reference numeral 1 denotes an indoor space of the air-conditioned room, which is surrounded by a floor 2, walls 3, and a ceiling (not shown). The underfloor space 4 is a closed space below the floor 2.
Are formed.

An indoor unit Ya of the air conditioner is arranged on one side of the floor 2. The indoor unit Ya,
The back side of the unit body 5 is in close contact with the wall 3, and a pair of upper and lower suction portions 6a and 6b having a filter is provided on the front side.

An indoor outlet 7 is provided on the upper surface of the unit body 5. The bottom of the unit body 5 is open, and faces the underfloor space 4 via the underfloor outlet 8 provided on the floor 2.

A floor surface outlet 9 is opened at the side opposite to the position where the indoor unit Ya is arranged and at two floors, and the underfloor space 4 and the indoor space 1 connect the floor surface outlet 9 to each other. Communicated through.

In particular, the underfloor outlet 8 and the floor surface outlet 9 are closed by a pest intrusion prevention plate 10. The pest invasion prevention plate 10 is composed of, for example, a wire net-shaped plate body a as shown in FIG. 4A, or a punched metal plate body b as shown in FIG. 4B. Each of the plates a and b has air permeability and a function of preventing passage of pests such as cockroaches and rats.

As shown in FIG. 1 again, a pair of upper and lower heat exchangers 11A and 11B are arranged inside the unit body 1 at positions facing the upper and lower suction portions 6a and 6b. As described later, the upper heat exchanger is used as the indoor heat exchanger 11A, and the lower heat exchanger is used as the underfloor heat exchanger 11B.
Used as

Further, an indoor blower 12A and a fan casing 13A are arranged on the back side of the indoor heat exchanger 11A, and an underfloor blower 12B and a fan casing 13B are arranged on the back side of the underfloor heat exchanger 11B. You.

Therefore, by driving the indoor blower 12A, the air in the indoor space 1 is sucked into the unit body 5 from the upper suction portion 6a, and the indoor heat exchanger 11A
The air is blown back into the indoor space 1 from the indoor air outlet 7 on the upper surface through the inside of the unit body 5, and an indoor air passage 14 is formed in the unit main body 5.

Further, by driving the underfloor blower 12B, the air in the indoor space 1 is sucked into the unit main body 5 from the lower suction portion 6b, and from the underfloor outlet 8 via the underfloor heat exchanger 11B. It is blown out to 4. Further, the air is blown out from the underfloor space 4 to the indoor space 1 again through the floor surface outlet 9, and an underfloor ventilation passage 15 is formed in the unit body 5.

In other words, the indoor ventilation passage 14 is provided with the indoor outlet 7, the indoor blower 12 A and the indoor heat exchanger 11 A are arranged, and the underfloor ventilation passage 15 is provided with the underfloor outlet 8 and the underfloor outlet 8. The blower 12B and the underfloor heat exchanger 11B will be arranged.

As shown in FIG. 2, the indoor unit Ya of the air conditioner thus constructed is an outdoor unit Y.
b and a pipe connection and an electrical connection, thereby forming a refrigeration cycle and a control system between the indoor unit Ya and the outdoor unit Yb.

That is, the indoor heat exchanger 11A and the under-floor heat exchanger 11B are connected in parallel, and the parallel circuit 16 includes a compressor 17, a four-way valve 18, and the outdoor heat exchanger 1
9 and the automatic expansion valve 20 and the like so as to constitute a heat pump type refrigeration cycle.

In the parallel circuit 16 of the indoor heat exchanger 11A and the underfloor heat exchanger 11B, an electromagnetic on-off valve 21 for opening and closing the refrigerant flow path is provided at the liquid-side entrance of the underfloor heat exchanger 11B. Provided.

The indoor blower 12A has a cross flow fan 22b fitted on the rotating shaft of a drive motor 22a, and the underfloor blower 12B has a propeller type centrifugal fan 23b fitted on the rotating shaft of the drive motor 23a. Become worn.

The compressor 17 and the four-way valve 18
The outdoor blower 24, the indoor blower 12 </ b> A, the underfloor blower 12 </ b> B, and the electromagnetic on-off valve 21 which are arranged to face the outdoor heat exchanger 19 are all electrically connected to the control unit 25.

The control unit 25 receives a command signal from a not-shown remote control type operation device (hereinafter abbreviated as a remote controller) or a detection signal from a not-shown indoor temperature sensor or floor temperature sensor, and receives the command signal. A control signal is sent to each component such as the compressor 17 electrically connected to the control unit.

The remote controller is provided with a run / stop button, an operation switching button, an indoor air volume change button, a floor air volume change button, an indoor temperature adjustment button, a floor temperature adjustment button, an underfloor air flow switching button, and the like.

Thus, in the cooling operation mode, a cooling cycle in which the refrigerant flows in the direction of the solid line arrow in the figure is constituted, and the outdoor heat exchanger 19 is a condenser, the indoor heat exchanger 11A and the underfloor heat exchanger 11B are. Functions as an evaporator.

In the heating operation mode, a heating cycle in which the refrigerant flows in the direction of the dashed arrow in the drawing is configured, and the outdoor heat exchanger 19 is an evaporator, and the indoor heat exchanger 11A and the underfloor heat exchanger 11B are condensers. Function.

At the same time, the indoor blower 12A is operated, heat exchange air circulates along the indoor ventilation path 14, and the indoor space 1 is cooled and heated. Further, when the underfloor blower 12B is operated, heat exchange air circulates along the underfloor ventilation passage 15, cooling and heating the floor surface, and radiant cooling and heating of the indoor space 1.

The underfloor outlet 8 and the floor outlet 9
Is closed by the pest invasion prevention plate 10, so that pests such as cockroaches and rats can be prevented from entering the underfloor ventilation path 15 through the unit body 5, and sanitary air conditioning can be realized. In addition, by shaping the insect pest prevention plate 10 from a synthetic resin material, the effect is maintained for a long time without being affected by aging.

Since the indoor fan 12A is provided with the cross flow fan 22b, quiet air conditioning with low noise in the indoor space 1 can be realized. Further, since the underfloor blower 12B includes the high static pressure type centrifugal fan 23b as the underfloor blower 12B, even if the area of the underfloor ventilation path 15 is large and long, it is possible to minimize a decrease in the heat exchange air flow rate, Comfortable floor cooling and heating with a small floor temperature distribution is achieved.

To be more specific, as shown in FIG. 6, the air volume characteristics with respect to the static pressure of the centrifugal fan 23b and the cross flow fan 22b are known. That is, the centrifugal fan 23b has a high static pressure and is suitable for blowing air to a relatively distant range, but has a small air volume.

On the contrary, the cross flow fan 22b can take a large air volume, but has a low static pressure and is blown only to a relatively close range. Such a centrifugal fan 23b and a cross flow fan 22
With respect to the characteristic b, the matching position differs depending on the magnitude of the ventilation resistance of the ventilation path. That is, when the fan is arranged and operated in the ventilation path, the air volume characteristic with respect to the static pressure is naturally determined.

For example, when ventilation is provided in the underfloor ventilation path 15 with the same lateral flow fan 22b as the indoor side, when the ventilation resistance is small (narrow space), matching is performed at the point Aa.
When the ventilation resistance is large (a large space), matching is performed at the point Ba, the air volume is greatly reduced, the floor surface temperature distribution is increased, and an uncomfortable place exists.

When the centrifugal fan 23b is employed in the underfloor blower 12B as described above, the airflow is increased at points A and B in a large space under the floor or the like and provided with the pest intrusion prevention plate 10 and having a large airflow resistance. Match. The under-floor air volume does not change much, the floor surface temperature distribution is reduced, and comfortable floor radiation air conditioning can be realized.

Further, the air-conditioning operation is performed and the under-floor air flow switching button of the remote controller is turned on at predetermined intervals. Specifically, cooling operation is often performed in summer when the temperature and humidity are high.

That is, when the cool air is introduced into the underfloor space 4, the cool air leaks from the gap between the heat insulating materials and the joists are cooled directly, so that dew condensation easily occurs under the floor, which causes mold and corrosion of building materials. The same applies to the case where water is spilled in the vicinity of the floor surface outlet 9.

When the underfloor ventilation switching button of the remote controller is turned on, the control unit 25 sends a closing signal to the electromagnetic on / off valve 21 provided at the liquid side entrance of the underfloor heat exchanger 11B, and this on / off valve is closed. I do.

Therefore, the liquid refrigerant from the outdoor heat exchanger 19 is not guided to the underfloor heat exchanger 11B, but is entirely guided to the indoor heat exchanger 11A. On the other hand, the indoor blower 12A
The operation of the underfloor blower 12B is continued, and although the cooling action on the indoor space 1 is continued, only the air is blown on the underfloor space 4.

As described above, by switching to the underfloor ventilation switching operation mode and blowing air to underfloor space 4, underfloor space 4 is switched.
And dew condensation generated around the floor outlet 9 evaporates,
Moisture is removed and dried. Therefore, generation of mold can be suppressed, corrosion of building materials can be prevented, and the life of the house can be prolonged.

Then, the excessive cooling effect due to the floor radiation is weakened, and the temperature difference in the vertical direction in the room is reduced, so that a comfortable air conditioning operation is performed. A refrigeration cycle as shown in FIG. 3 may be used.

Here, the indoor heat exchanger 11A and the underfloor heat exchanger 11B arranged in the indoor unit Ya are connected in series in the refrigeration cycle, and an electronic control valve 26 for adjusting the flow rate is interposed between the heat exchangers. Are the same as those described above, except for the provision of, so that the same numbers are assigned and new explanations are omitted.

Thus, when the underfloor air flow switching mode is selected from the remote controller, the control unit 25 controls to reduce the flow rate of the electronic control valve 26 for adjusting the flow rate.
The refrigerant is guided from the outdoor heat exchanger 19 to the indoor heat exchanger 11A via the expansion valve 20 and evaporates, and the cooling operation on the indoor space 1 is continuously performed.

However, since the electronic control valve 26 provided on the downstream side of the indoor heat exchanger 11A is greatly throttled, the refrigerant almost evaporates in the indoor heat exchanger 11A and is superheated and led out. Is done.

The superheated refrigerant is:
Although it is guided to the underfloor heat exchanger 11B as it is, no heat exchange action is performed here. On the other hand, from the place where the operation of the underfloor blower 12B is continued, the room temperature air is blown into the underfloor space 4 and circulates.

Accordingly, the dew condensation formed around the underfloor space 4 and the floor surface outlet 9 evaporates to remove moisture and dry. Mold generation is suppressed, corrosion of building materials is prevented, and the life of the house is prolonged.

As shown in FIG. 5, an air purifier 27 may be arranged between the lower suction portion 6b in the unit body 5 and the underfloor heat exchanger 11B. Other configurations are the same as those described above, and thus the same reference numerals are given and new description is omitted.

By providing the air purifier 27, dust and mites existing in the air blown into the underfloor space 4 can be adsorbed and removed, and a more hygienic air-conditioning operation can be performed.

In the above-described embodiment, the switching operation mode in which only the underfloor ventilation is performed without performing the underfloor cooling during the cooling operation is provided. However, the present invention is not limited to this. Needless to say, a switching operation mode in which only the underfloor ventilation is performed without performing the above operation may be provided.

[0052]

As described above, according to the first to fourth aspects of the present invention, it is possible to prevent an excessive cooling effect and to obtain a comfortable air conditioner on the premise that air conditioning can be performed in the room and under the floor. The effect of evaporating the dew condensation in the underfloor space to suppress the generation of mold and preventing the corrosion of building materials to improve the life of the house is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a room equipped with an air conditioner, showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a refrigeration cycle and a control system of the air conditioner, showing the embodiment.

FIG. 3 is a configuration diagram of a refrigeration cycle and a control system of an air conditioner, showing another embodiment.

FIGS. 4A and 4B are partially enlarged views of different pest intrusion prevention plates.

FIG. 5 is a schematic configuration diagram of an air conditioner showing still another embodiment.

FIG. 6 is a characteristic diagram of the static pressure with respect to the air volume of the centrifugal fan and the cross flow fan.

[Explanation of symbols]

 14 ... indoor ventilation path, 15 ... underfloor ventilation path, 7 ... indoor outlet, 12A ... indoor blower, 12B ... underfloor blower, 11A ... indoor heat exchanger, 11B ... underfloor heat exchanger, 8 ... underfloor blowout Mouth, 25: control unit, 21: solenoid on-off valve, 26: electronic control valve (for flow rate adjustment), 22b: cross flow fan, 23b: centrifugal fan.

Claims (4)

[Claims] An indoor ventilation path and an underfloor ventilation path are provided, an indoor air outlet is provided in the indoor ventilation path, and a blower and a heat exchanger are arranged. The underfloor ventilation path is provided with an underfloor air outlet and exchanges heat with the blower. The air conditioner in which an air conditioner is arranged and air conditioning operation capable of switching between cooling and heating operations is provided, and in air conditioning operation, control means for controlling an underfloor ventilation switching operation mode in which only underfloor ventilation is performed without performing underfloor cooling and heating. An air conditioner characterized by that: 2. The heat exchangers respectively arranged in the indoor ventilation passage and the underfloor ventilation passage are connected in parallel in a refrigeration cycle, and a refrigerant flow passage is provided at a liquid-side entrance of the underfloor heat exchanger. An on-off valve that opens and closes is interposed, and by selecting the underfloor ventilation switching operation mode during cooling operation, the control means controls the underfloor blower and closes the on-off valve. The air conditioner according to claim 1, wherein 3. The heat exchangers disposed in the indoor ventilation passage and the underfloor ventilation passage, respectively, are connected in series in a cooling operation mode in the order of an indoor heat exchanger and an underfloor heat exchanger. A control valve for adjusting the flow rate is provided between the heat exchanger and the underfloor heat exchanger, and the underfloor blower switching operation mode is selected during the cooling operation. The air conditioner according to claim 1, wherein the air conditioner is operated so as to reduce the opening of the control valve for adjusting the flow rate so as to superheat the refrigerant in the indoor heat exchanger. 4. The air conditioner according to claim 2, wherein the indoor blower has a cross flow fan, and the underfloor blower has a centrifugal fan.