JPH07117274B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) [0001] The present invention relates to a heat pump type air conditioner capable of heating operation.

(Prior Art) Some air conditioners include a heat pump type refrigeration cycle as shown in FIG. 10 and can perform heating operation as well as cooling operation.

In FIG. 10, reference numeral 1 is a compressor, and a four-way valve 2, an outdoor heat exchanger 3, a decompression device such as an expansion valve 4, an indoor heat exchanger 5 are sequentially connected to the compressor 1 to form a heat pump type refrigeration cycle. The outdoor fan 6 and the indoor fan 7 are disposed near the outdoor heat exchanger 3 and the indoor heat exchanger 5.

Then, during the cooling operation, the cooling medium is caused to flow in the direction indicated by the solid line arrow to form a cooling cycle, and the outdoor heat exchanger 3 acts as a condenser and the indoor heat exchanger 5 acts as an evaporator, and the indoor fan 7 is operated. Indoor air is circulated through the indoor heat exchanger 5 to blow cold air into the room.

Also, during the heating operation, the switching operation of the four-way valve 2 causes the refrigerant to flow in the direction of the broken line arrow to form a heating cycle, and the indoor heat exchanger 5 acts as a condenser and the outdoor heat exchanger 3 acts as an evaporator. By operating the indoor fan 7, indoor air is circulated through the indoor heat exchanger 5 to blow out warm air into the room.

By the way, such a heating operation using warm air is excellent in heating the entire room, but has drawbacks such as discomfort (draft feeling) caused by the wind hitting the human body, and quick warming of cold limbs. It also has the drawback that it has a weaker heating feeling than oil stoves that can be warmed up to.

Therefore, in addition to the normal warm air heating, there is one that performs radiant heating. This is to provide a heat radiation panel on the front surface of the indoor unit and to radiate the heat of the high-temperature refrigerant flowing through the heat radiation panel into the room through the heat radiation panel, and quickly warm the limbs held over the heat radiation panel. It is possible to obtain a special heating effect that hot air heating does not have.

However, in this case, it is the actual situation that the hot air heating and the radiant heating are not properly used properly, and the respective functions cannot be fully exhibited, and there is room for improvement in terms of comfort.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances.
The purpose is to enable the proper use of hot air heating and radiant heating, and to make full use of the functions of hot air heating and radiant heating, which greatly improves comfort. It is to provide an air conditioner that enables it.

[Structure of the Invention] (Means for Solving the Problems) A compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, a radiant heat exchanger, the four-way valve, and the compressor are sequentially connected. A heat pump type refrigeration cycle, the indoor heat exchanger, an indoor fan for circulating indoor air to the indoor heat exchanger, an indoor unit equipped with the radiant heat exchanger and having an exposed heat radiation panel in the room, and a heating operation At the same time, the refrigerant is circulated in the order of the indoor heat exchanger and the radiant heat exchanger, and at the same time, the indoor fan is turned on or off to perform warm air / radiant heating or radiant heating, and at the time of radiant heating, warm air / radiant heating is performed. And a control means for controlling so that the capacity of the compressor is reduced as compared with that during heating.

(Operation) During heating operation, the warm air / radiant heating is performed by circulating the refrigerant through the indoor heat exchanger and the radiant heat exchanger and turning on the operation of the indoor fan. On the other hand, during the heating operation, the radiant heating is performed by circulating the refrigerant through the indoor heat exchanger and the radiant heat exchanger and turning off the operation of the indoor fan. Then, in consideration of the small heat radiation capacity of the heat radiation panel during the radiant heating, the capacity of the compressor is reduced as compared with the hot air / radiant heating.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, 11 is a variable capacity compressor.
Four-way valve 12, outdoor heat exchanger 13, expansion valve 1 which is a pressure reducing device
4, the indoor heat exchanger 15, the radiant heat exchanger 16 are sequentially connected,
A heat pump type refrigeration cycle is configured, and an outdoor fan 17 and an indoor fan 18 are arranged near the outdoor heat exchanger 13 and the indoor heat exchanger 15.

The outdoor heat exchanger 13, the outdoor fan 17, the compressor 11, the four-way valve 12, the expansion valve 14 and the like constitute an outdoor unit A,
The indoor unit B is composed of the indoor heat exchanger 15, the indoor fan 18, the radiant heat exchanger 16, the heat exchange temperature sensor 21, and the like.

Then, during the cooling operation, a cooling cycle is formed by causing the refrigerant to flow in the direction of the solid arrow in the figure, and the outdoor heat exchanger 13 is condensed by the condenser,
The indoor heat exchanger 15 and the radiant heat exchanger 16 are made to act as an evaporator, and during the heating operation, the four-way valve 12 is switched to cause the refrigerant to flow in the direction of the dashed arrow in the drawing to form a heating cycle. The exchanger 15 is a condenser and the outdoor heat exchanger 13
As an evaporator.

On the other hand, as shown in FIGS. 1 and 2, the indoor unit B
Has a heat radiation panel 31 which is made of metal and which also serves as an air suction port in the front of the room and which also serves as an air inlet, and an air outlet 32 at the lower part, and a ventilation path formed by a heat insulating material 33 from the heat radiation panel 31 to the air outlet 32. 34 is formed, and an indoor heat exchanger (air fin tube type) 15 is arranged in the ventilation passage 34 in the vicinity of the heat radiation panel 31.

The radiant heat exchanger (refrigerant pipe) 16 and the panel temperature sensor 35 are attached to the back side of the heat radiating panel 31, and the indoor fan 18 is provided in the ventilation passage 34 between the indoor heat exchanger 15 and the air outlet 32. It is arranged. In addition, 15a is a drain receiver.

In addition, a remote control type operation unit 36 is led out from the lower part of the indoor unit B, and the operation unit 36 is cooled and cooled.
A warm switch 37 and a heating mode switch 38 are provided.

Here, the heating mode changeover switch 38 switches between a "fan panel" mode for performing both hot air heating and radiant heating, an "automatic" mode for automatically switching between hot air heating and radiant heating, and radiant heating. It has each "panel" mode position to execute.

Although not shown, the operation unit 36 is also provided with an operation start switch and a temperature setting knob.

FIG. 4 shows a control circuit. In the figure, reference numeral 40 is a commercial AC power source, and a control unit 42 is connected to the power source 40 via a transformer 41.

The control unit 42 is composed of a microcomputer and its peripheral circuits, etc., and controls the entire air conditioner. The indoor temperature sensor 43, the heat exchange temperature sensor 21 attached to the indoor heat exchanger 15, and the panel temperature. A sensor 35, an indoor fan motor power supply unit 44, relays 45, 46, 47, a power supply unit 48, etc. are connected.

Therefore, the power supply 40 controls the energization and the applied voltage to the indoor fan motor 18M according to the command from the control unit 42, the indoor fan motor power supply unit 44, the contacts of the relay 45, and the relay 46.
The indoor fan motor 18M is connected via the contacts in series.

Further, the four-way valve 12 is connected to the power source 40 through the contacts of the relay 45, the contacts of the relay 46 and the contacts of the relay 47 in series.

Further, the power source 40 is connected to the power source section 48 via the contacts of the relay 45 and the contacts of the relay 46 in series.

Then, the outdoor fan motor 17M is connected to the power supply 40 through the contacts of the relay 45, the contacts of the relay 46, and the power supply unit 48 in series.

Here, the power supply unit 48 has a built-in inverter circuit and is connected to the control unit 42 via a serial signal line 49, rectifies the output of the power supply 40, and rectifies the output to a frequency and voltage according to a command from the control unit 42. The three-phase alternating current is converted into three-phase alternating current and supplied to the compressor motor 1M, and at the same time, it has a function of controlling energization of the outdoor fan motor 17M in accordance with a command from the control unit 42.

Next, the operation of the above structure will be described with reference to FIG.

Set the "heating" mode with the cooling / warming selector switch 37 and the "fan panel" mode with the heating mode selector switch 38 of the operation operating unit 36, and set the desired room temperature with the operation operating unit 36 to start the operation. I do.

Then, all of the relays 45, 46, 47 are excited, the indoor fan motor power supply unit 44 and the power supply unit 48 are driven, the compressor 11, the outdoor fan 17, and the indoor fan 18 are activated, respectively, and the four-way valve is activated. 12 switches.

Therefore, a heating cycle is formed, the indoor heat exchanger 15 and the radiant heat exchanger 16 act as a condenser, and when the indoor fan 18 is turned on, the indoor air is sucked into the indoor unit B through the gap of the heat radiation panel 31, That is the indoor heat exchanger 15
The heat is taken from the air and the temperature rises, forming hot air and the air outlet 32
Is blown indoors.

At the same time, the heat of the high-temperature refrigerant passing through the radiant heat exchanger 16 is transferred to the thermal radiation panel 31, and is radiated from the thermal radiation panel 31 into the room.

The indoor heat exchanger 15 has a heat radiation amount of about 3000 to 4500 Kcal / h, and the heat radiation panel 31 has a heat radiation amount of about 500 to 1200 Kcal / h.

As described above, by simultaneously performing warm air heating and radiant heating, it is possible to efficiently warm the entire room, and also to quickly warm the limbs held over the thermal radiation panel 31 with an oil stove or the like.

Then, during this warm air / radiant heating, the control unit 42 takes in the temperature detected by the indoor temperature sensor 43, and outputs the output frequency of the inverter circuit of the power supply unit 48 according to the difference between the detected temperature and the set temperature (hereinafter, operating frequency (Hereinafter, referred to as “)”, thereby controlling the capacity of the compressor 1.

In this case, the difference between the detected temperature and the set temperature is proportional to the operating frequency, and if the difference between the detected temperature and the set temperature is large, the operating frequency is increased, and if the difference is small, the operating frequency is decreased to perform the fifth control. As shown in the figure, the condensing temperature (compressor gas pressure of the compressor) changes, but the condensing temperature is detected by the heat exchange temperature sensor 21 so that it does not become too high and the compressor 11 fails, or it becomes too low. The operating frequency is finely adjusted so as to fall within the range of 40 to 60 ° C. so that the heating feeling is not impaired.

Further, the heat exchange temperature sensor 21 is also used for automatic speed switching that makes the indoor fan 18 low speed when the heat exchange temperature is low and high speed when the heat exchange temperature is high.

On the other hand, the cooling / heating changeover switch 37 of the operation control unit 36 causes the "heating" mode and the heating mode changeover switch 38 causes the "panel".
Set the mode and start operation.

Then all the relays 45, 46, 47 are excited,
The power supply 48 is driven, but the power supply for the indoor fan motor 44
Is not driven, the compressor 11 and the outdoor fan 17 are activated, and the four-way valve 12 is switched.

Therefore, a heating cycle is formed and the indoor heat exchanger 15 and the radiant heat exchanger 16 act as a condenser, but the indoor fan
Since 18 is in the operation-off state, hot air is not blown out, and only heat radiation from the heat radiation panel is performed.

Considering that the heat radiation amount of the heat radiation panel 31 is small during this radiant heating, the operating frequency is lowered to about 30-40 Hz, and the compressor
11 abilities are reduced.

This is to prevent wasteful consumption of electric power and to perform stable operation of the refrigeration cycle corresponding to the load.

At the same time, the control unit 42 takes in the temperature detected by the panel temperature sensor 35, controls the operating frequency so that the detected temperature becomes constant at the set value (40 to 60 ° C.), and when the detected temperature exceeds the set value, the compressor is operated. In order to protect 11, the compressor 11 is turned on and off.

However, at the start of the radiant heating, the control unit 42 sets the set value to 60 so that the temperature of the thermal radiation panel 31 quickly reaches the set value.
If the temperature is ° C, control is performed to raise the operating frequency above normal until the temperature detected by the panel temperature sensor 35 reaches 50 ° C, which is close to the set value.

However, even if the operating frequency is too high, the energy efficiency generated by the compressor 11 only decreases, so the operating frequency is 60
Selected to ~ 80Hz.

This radiant heating is not only capable of quickly warming the hands and feet, but also a gentle heating without any draft feeling or blowing noise to the human body.
This is the best choice. Moreover, since the radiant heating reduces the operating frequency of the compressor 11 to prevent unnecessary power consumption as described above, it is extremely economical.

Further, when the "automatic" mode is set by the heating mode changeover switch 38, the control unit 42 causes the warm air / radiant heating operation and the radiant heating operation described above to be performed, for example, according to the elapsed time of the timer or the indoor temperature sensor 43. According to the difference between the detected temperature and the set temperature, for example, when the room temperature reaches the set temperature, only the radiant heating is selected, and when the room temperature is equal to or lower than the set temperature, the hot air / radiant heating is automatically switched.

In the above embodiment, the case where the indoor unit B is the wall-mounted type has been described, but the same can be applied to the case where the indoor unit B is the floor-standing type as shown in FIGS. 6 to 9.

In FIG. 6 to FIG. 9, an indoor unit B has a heat radiation panel 51 and a driving operation part 52 made of metal on the front side, an air suction port 51 on the lower front side, an air suction port 54 on each lower side side, and an air blower on the upper side. An outlet 55 is provided, and a ventilation path 57 is formed by the heat insulating material 56 from the air inlets 53, 54, 54 to the air outlet 55.

The indoor heat exchanger 15 is disposed in the ventilation path 57 so as to face the heat radiation panel 51 apart from each other, and the indoor heat exchanger 15 and the air outlet 55 are arranged.
The indoor fan 18 is provided between the heat radiation panel 51 and the indoor fan 18, and the radiant heat exchanger 16 and the panel temperature sensor 35 are attached to the back side of the heat radiation panel 51. Reference numeral 58 is a drain receiver, and 59 is an electric circuit box.

In this case, the same operation as that of the above-described embodiment is performed except that the room air is sucked in from the lower part and the warm air is blown out from the upper part.

Further, in the above-described embodiment, at the start of radiant heating, the operating frequency was raised above the normal temperature until the temperature detected by the panel temperature sensor 35 reached a value slightly lower than the set value, but the discharge refrigerant temperature of the compressor 11 was detected. A temperature sensor may be provided to increase the operating frequency until the detected temperature reaches a predetermined value.

As described above, according to the present invention, the compressor, the four-way valve,
An outdoor heat exchanger, a decompression device, an indoor heat exchanger, a radiant heat exchanger, a heat pump type refrigeration cycle in which the four-way valve and the compressor are sequentially communicated with each other, and the indoor heat exchanger and the indoor heat exchanger are supplied with indoor air. An indoor fan that circulates, an indoor unit that is equipped with the radiant heat exchanger and is provided with an exposed heat radiation panel in the room, and at the time of heating operation, the refrigerant is circulated in the order of the indoor heat exchanger and the radiant heat exchanger and at the same time. Warm air by controlling the indoor fan on or off
As well as performing radiant heating or radiant heating, the radiant heating is equipped with a control means for controlling so as to reduce the capacity of the compressor as compared with warm air / radiant heating. Thus, it is possible to provide the air conditioner that can fully realize the functions of the warm air heating and the radiant heating, thereby significantly improving the comfort.

[Brief description of drawings]

FIG. 1 is a diagram showing an internal configuration of an indoor unit in one embodiment of the present invention, FIG. 2 is an external perspective view of the same embodiment, and FIG. 3 is a diagram showing a configuration of a refrigeration cycle in the same embodiment,
FIG. 4 is a diagram showing the configuration of a control circuit in the same embodiment, FIG. 5 is a diagram for explaining the operation of the same embodiment, and FIG. 6 is an external perspective view of an indoor unit in another embodiment of the present invention. FIG. 7 is a side view of the interior of FIG. 6, FIG. 8 is a top view of the interior of FIG. 6, and FIG. 9 is a front view of the interior of FIG. FIG. 10 is a diagram showing a configuration of a refrigeration cycle in a conventional air conditioner. B ... Indoor unit, 11 ... Variable capacity compressor, 15 ... Indoor heat exchanger, 16 ... Radiant heat exchanger, 18 ... Indoor fan,
31 ... Heat radiation panel, 42 ... Control unit.

Claims (1)

[Claims] 1. A heat pump type refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, a radiant heat exchanger, the four-way valve and the compressor are sequentially connected, and the indoor heat. An exchanger, an indoor fan for circulating indoor air to the indoor heat exchanger, an indoor unit equipped with the radiant heat exchanger and having an exposed heat radiation panel in the room, and the indoor heat exchanger and the radiant heat during heating operation At the same time as circulating the refrigerant in the order of the exchanger, the indoor fan is controlled to be turned on or off to perform hot air / radiant heating or radiant heating. An air conditioner characterized by comprising: