JPH06235556A - Air conditioner - Google Patents

Abstract

PURPOSE:To obtain a sufficient heat radiation capacity of an indoor radiator and perform a stable refrigerant heating operation of an air conditioner where refrigerant is heated for heating operation and a compressor is operated for cooling operation, by a method wherein the refrigerant in a heating circuit is transferred to a cooling circuit to adequately adjust the amount of the refrigerant in the heating circuit. CONSTITUTION:An air conditioner is provided with a heating circuit 17 consisting of a refrigerant heater 15, a refrigerant pump 8 and an indoor heat exchanger 8 that are connected by pipes in series, a cooling circuit 23 which has an outdoor heat exchanger 4 and a compressor 1 and additionally connected to the heating circuit 17 at one end via a flow path transfer valve 2 and the other end via a first solenoid operated valve 5, a refrigerant pressure detector 21 mounted on the heating circuit 17, and a room temperature detector 22 installed at an air suction port of an indoor radiator 8. When the detected temperatures of the room temperature detector 22 are not higher than a specified temperature and the detected pressures of the refrigerant pressure detector 21 are a specified pressure or higher, a controller 29 opens the first solenoid operated valve 5 for a specified time period to transfer the refrigerant in the heating circuit 17 to the cooling circuit 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner which utilizes both heating by heating a refrigerant and cooling by a compressor and a heat exchanger.

[0002]

2. Description of the Related Art Conventionally, as an air conditioner which performs heating by this type of refrigerant heating and cooling by a compressor and a heat exchanger, for example, a structure as shown in FIG. 3 shown in Japanese Patent Laid-Open No. 57-101263 is shown. There is something.

That is, an outdoor heat exchanger 4 having a compressor 1, a flow path switching valve 2, an outdoor blower 3, a first electromagnetic valve 5, a capillary tube 6, an indoor heat exchanger 8 having an indoor blower 7,
A second solenoid valve 9, a check valve 10, and an accumulator 11 are sequentially connected by piping to form a circulation path, and a third solenoid valve 12,
Refrigerant pump 13 and a refrigerant heater 15 having a burner 14 are connected in series to connect a series piping circuit between the downstream side of the capillary tube 6 and the upstream side of the second solenoid valve 9 and the refrigerant is sealed as a working medium. ing.

In the heating operation, the first electromagnetic valve 5 is closed and the compressor 1 is driven to move all the refrigerant on the outdoor heat exchanger 4 side to the refrigerant heater 15 side, and then the refrigerant heater 15 is burned. A heating cycle is configured by using the indoor heat exchanger 8 as a condenser and the refrigerant pump 13 as a refrigerant transporting means to evaporate by heating with the compressor 1.
It constitutes a conventional cooling cycle by driving.

Further, as an air conditioner for heating by using other refrigerant heating, conventionally, cooling is performed by a conventional method driven by a compressor, and heating is performed by using this cooling compressor as a refrigerant gas pump (not shown). There is also.

[0006]

However, in the conventional cooling and heating hybrid circuit as described above,
During the heating operation, if the refrigerant leaks to the outside, the refrigerant becomes insufficient and overheats in the refrigerant heater. If the refrigerant charging amount exceeds the proper amount, the refrigerant pressure during operation increases and the heating capacity cannot be maintained.

The present invention solves such a conventional problem, and air for stable refrigerant heating operation by increasing the refrigerant charge amount more than an appropriate amount and appropriately adjusting the refrigerant amount in the heating circuit in the circuit. The purpose is to provide a harmony machine.

[0008]

In order to achieve the above object, the present invention has a heating circuit in which a refrigerant heater, a heat transfer section, and an indoor heat exchanger are sequentially connected by piping, and a flow path switching valve is provided at one end. The other end is connected to the heating circuit via an opening / closing valve, and is connected to the heating circuit. The cooling circuit has an outdoor heat exchanger and a compressor, the refrigerant pressure detecting means provided in the heating circuit, and the air intake section of the indoor radiator. The temperature detecting means is provided, and a control device is configured to open the on-off valve for a certain period of time when the temperature of the temperature detecting means is below a predetermined temperature and the pressure of the refrigerant pressure detecting means is above a predetermined temperature. .

[0009]

According to the present invention, the refrigerant filling amount is made larger than an appropriate amount and the room temperature is detected by the temperature detecting means provided in the air suction portion of the indoor radiator when the room temperature is equal to or lower than the predetermined temperature. When the pressure of the refrigerant detected by the refrigerant pressure detection means provided in the heating circuit becomes equal to or higher than a predetermined value, the opening / closing valve for separating the cooling circuit and the heating circuit is opened for a certain period of time, and the refrigerant in the heating circuit is transferred to the cooling circuit. Move and adjust the amount of refrigerant in the heating circuit appropriately.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

An outdoor heat exchanger 4 having a compressor 1, a flow path switching valve 2, an outdoor blower 3, a first solenoid valve 5, a capillary tube 6, an indoor heat exchanger 8 having an indoor blower 7, and a second solenoid valve 9. , A check valve 10 and an accumulator 11 are sequentially connected to form a circulation path, and a third solenoid valve 12, a refrigerant pump 13, and a refrigerant heater 15 having a burner 14 are connected in series to form a series piping circuit in a capillary. A circuit connected between the downstream side of the tube 6 and the upstream side of the second electromagnetic valve 9 is configured to contain a refrigerant as a working medium.

Reference numeral 16 is an overheat detector provided on the wall surface of the refrigerant heater 15, and 17 is the refrigerant heater 15, the gas refrigerant pipe 18, the indoor heat exchanger 8, the liquid refrigerant pipe 19, and the third solenoid valve 12. Is a heating circuit in which the refrigerant pump 13 and the refrigerant pump 13 are connected to form an annular circulation path. Reference numeral 20 is a fuel supply device for supplying fuel to the burner 14, 21 is a refrigerant pressure detector provided in the gas refrigerant pipe 18 of the heating circuit 17, and 22 is an air intake portion of the indoor heat exchanger 8 of the indoor radiator. It is a room temperature detector that detects the temperature of the incoming air side. Reference numeral 23 is a cooling circuit including the compressor 1, the outdoor heat exchanger 4, the first electromagnetic valve 5, and the capillary tube 6.

Reference numeral 24 is a liquid side service valve provided in the liquid refrigerant pipe 19, 25 is a gas side service valve provided in the gas refrigerant pipe 18, and 26 is a liquid side joint provided on the indoor heat exchanger 8 side of the liquid refrigerant pipe 19. , 27 are gas side joints provided on the indoor heat exchanger 8 side of the gas refrigerant pipe 18, and the liquid side and gas side service valves 24, 25 and the liquid side and gas side joint 2
Between 6 and 27, the length of the connecting refrigerant pipe can be arbitrarily set according to the installation distance between the outdoor side and the indoor side.

Reference numeral 29 is a rotation speed detector of the indoor blower 7, and 29 is an overheat detector 16, a first solenoid valve 5, a second solenoid valve 9, a third solenoid valve 12, a fuel supply device 20, a refrigerant pressure detector. 21, room temperature detector 22, rotation speed detector 28, compressor 1
When the temperature of the room temperature detector 22 is equal to or lower than a predetermined temperature (for example, 20 ° C.) and the pressure of the refrigerant pressure detector 21 is equal to or higher than a predetermined temperature (for example, 24 kg / cm ² ), the first solenoid valve is connected. 5 is a control device that opens the valve 5 for a fixed time (for example, 0.5 seconds). The cooling circuit 23 and the heating circuit 17 are filled with R-22 as a refrigerant in an amount larger than an appropriate amount.

Further, during the heating operation, the solenoid valve 5 is closed, and after the pumping operation in which all the refrigerant on the outdoor heat exchanger 4 side is moved to the refrigerant heater 5 side by driving the compressor 1, the refrigerant heater 15 is set on the burner 14. The heating cycle is configured by using the indoor heat exchanger 8 as a condenser, the refrigerant pump 13 as a refrigerant transfer means, and the cooling by heating the compressor 1
It constitutes a conventional cooling cycle by driving.

In the above structure, the heating is performed by the refrigerant heater 1.
5, the liquid refrigerant heated by the heat of combustion in the burner 14 flows into the indoor heat exchanger 8 through the gas refrigerant pipe 18 in the gas phase state, and radiates heat indoors by the operation of the indoor blower 7. Is condensed and liquefied to become a supercooled liquid, and the liquid refrigerant is supplied to the refrigerant heater 15 through the liquid refrigerant pipe 19, the third solenoid valve 12, and the refrigerant pump 13.

When the amount of the filled refrigerant is larger than the appropriate amount, the amount of the liquid refrigerant increases in the indoor heat exchange air 8. Therefore, the indoor heat exchanger 1
The high temperature two-phase refrigerant region in 2 is reduced, and the indoor heat exchanger 12
The heat dissipation capacity of Therefore, the temperature of the entire heating circuit rises and the pressure rises. Therefore, in order to guarantee the design pressure, it is necessary to reduce the heating amount by the burner 14 or stop the heating.

Further, when the refrigerant has a long connection refrigerant pipe at the time of installation or leaks to the outside during operation and the amount of the filled refrigerant becomes less than an appropriate amount, the refrigerant heater 15 is overheated due to insufficient refrigerant,
The operation is stopped by the overheat detector 16.

Therefore, the refrigerant charging amount is made larger than an appropriate amount,
When the room temperature is low and the heat radiation capacity of the indoor heat exchanger 8 is sufficient for the amount of heating by the burner 14, the pressure of the refrigerant in the heating circuit 17 is detected, and the refrigerant is heated until this pressure becomes an appropriate value or less. By moving from the circuit 17 to the cooling circuit 23 and keeping the amount of refrigerant in the heating circuit 17 appropriate, sufficient heat dissipation of the indoor radiator 8 can be achieved while keeping the pressure rise of the entire heating circuit 17 below a certain level (30 kg / cm ² ). Ability is obtained.

In FIG. 2, since the amount of refrigerant in the heating circuit is larger than the proper amount, the pressure of the refrigerant pressure detector 21 becomes 25 kg / cm ² G or more when the temperature of the room temperature detector 28 is 20 ° C. or less. 1 is an example showing refrigerant behavior control at the start of combustion in which one solenoid valve 5 is repeatedly opened for a certain period of time (for example, 0.5 seconds).

In FIG. 2, first, the first electromagnetic valve 5 is closed and the compressor 1 is operated so that the refrigerant on the cooling circuit 23 side is cooled by the heating circuit 1.
The pump down operation for collecting to the 7 side is performed, and all the refrigerant is transferred to the heating circuit. After that, the fuel is supplied to the burner 14 by the fuel supply device 20, and the refrigerant heater 15 is heated by the combustion heat. Due to the amount of heat thus heated, the temperature of the entire heating circuit 17 and the refrigerant pressure rise, and heat is radiated indoors from the indoor heat exchanger 8. Therefore, the refrigerant pressure detector 21, which is the pressure of the refrigerant, and the room temperature detector 27 draw a rising increase curve.

Therefore, when the temperature of the room temperature detector 28 is 20 ° C. or lower and the pressure of the refrigerant pressure detector 21 becomes 25 kg / cm ² G, the first solenoid valve 5 is opened for 0.5 seconds and then closed. As a result, the amount of refrigerant in the heating circuit 17 decreases, the amount of liquid refrigerant in the indoor heat exchanger 8 decreases, and the heat radiation capacity increases. For this reason,
The pressure in the heating circuit 17 also drops. After that, the values of the refrigerant pressure detector 21 and the room temperature detector 20 rise and increase again due to heating and room temperature rise, and by repeating the above operation, the refrigerant in the heating circuit 17 reaches an appropriate amount and the pressure rises abnormally. There is no maximum heat dissipation. After the room temperature rises to some extent (20 ° C.), the combustion amount of the burner 14 is reduced or stopped by the fuel supply device 20 so that the temperature of the refrigerant pressure detector 21 does not rise any more, and the heating amount is controlled.

Further, the heat radiation capacity of the indoor heat exchanger 8 changes depending on the indoor temperature, the temperature of the refrigerant, and the air volume of the indoor blower 7. Therefore, by providing a means for detecting this air volume, the proper refrigerant volume can be set with higher accuracy. In the present embodiment, the rotation speed detector 28 of the indoor blower 7 is provided as the air volume detecting means, but as another example, the voltage applied to the indoor blower 7 or the temperature detection in the middle of the indoor heat exchanger 8 is performed. It is also possible to provide a device and calculate from this value and the values of the room temperature detector 22 and the refrigerant pressure detector 21. When the air volume by the rotation speed detector 28 becomes small, the pressure of the refrigerant pressure detector 21 becomes equal to or higher than a predetermined value, and the first solenoid valve 5 is opened for 0.5 seconds for a predetermined time to reach the predetermined value 25 kg / cm ^2. Lower G. For example air volume is 25kg / cm ² G, paralytic weight 21kg / cm ² G, Shokazeryou is 19kg / cm ² G, to. As a result, during the heating operation, the amount of the refrigerant is always optimum for the heating circuit 17, and even when the air volume is changed from the small amount to the large amount, the normal operation can be performed without performing the pump down operation.

As described above, the heating operation can be normally performed even if the refrigerant charging amount is injected more than the proper amount, so that the air conditioner can be charged with a larger amount of the refrigerant, and the refrigerant slightly leaks from the device. Also operates normally and durability and reliability are improved. Also, even if the injected refrigerant amount varies somewhat, it operates normally as well, so workability at the time of refrigerant filling, workability at installation is good, and at the time of installation, the connection refrigerant pipe according to the installation distance between the outdoor side and the indoor side is installed. Even if the length is set arbitrarily, normal operation is performed without changing the amount of the filled refrigerant.

For cooling, the flow path switching valve 2 is switched in the direction of the broken line in FIG. 1, the first solenoid valve 5 and the second solenoid valve 9 are opened, and the third solenoid valve 12 is closed, so that the compressor 1 and the indoor blower are closed. By operating 7 and the outdoor blower 2, the conventional compressor-driven cooling is performed.

[0026]

As described above, the air conditioner of the present invention has a heating circuit in which a refrigerant heater, a heat transfer section, and an indoor heat exchanger are sequentially connected by piping, and one end is connected via a flow path switching valve to another. The end is provided in the cooling circuit having the outdoor heat exchanger and the compressor additionally connected to the heating circuit via the on-off valve, the refrigerant pressure detection means provided in the heating circuit, and the air suction section of the indoor radiator. According to a configuration provided with a temperature detecting means and a control device for opening the opening / closing valve for a certain period of time when the temperature of the temperature detecting means is equal to or lower than a predetermined temperature and the pressure of the refrigerant pressure detecting means is equal to or higher than a predetermined temperature. , Increase the refrigerant charge more than the proper amount,
The refrigerant can be moved from the heating circuit to the cooling circuit in accordance with the temperature detecting means, the amount of the refrigerant in the heating circuit can be always kept appropriate, sufficient heat dissipation capacity can be obtained, and normal stable refrigerant heating operation can be realized.

Further, by providing means for detecting the air volume of the indoor blower, the proper refrigerant volume can be set with higher accuracy,
Even when the air volume is changed from small to large, it can operate normally without pump down operation. And, even if the refrigerant charging amount is injected more than an appropriate amount, since the heating operation can be normally performed, the refrigerant operates normally even if the refrigerant leaks, and durability,
Improves reliability. Further, even if the amount of injected refrigerant varies to some extent, the workability and workability are good because the same normal operation is performed.

[Brief description of drawings]

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

FIG. 2 is a refrigerant behavior control operation diagram of the embodiment of the present invention.

FIG. 3 is a system configuration diagram of a conventional air conditioner

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Flow path switching valve 4 Outdoor heat exchanger 5 1st solenoid valve 8 Indoor heat exchanger 13 Refrigerant pump 15 Refrigerant heater 17 Heating circuit 21 Refrigerant pressure detector 22 Room temperature detector 23 Cooling circuit 28 Rotation speed detector 29 Control device

Claims (3)

[Claims] 1. A heating circuit in which a refrigerant heater, a heat transfer section, and an indoor heat exchanger are sequentially connected by piping, and one end is connected to the heating circuit via a flow path switching valve and the other end is connected via an opening / closing valve. A cooling circuit having an outdoor heat exchanger and a compressor connected to each other, a refrigerant pressure detecting means provided in the heating circuit, a temperature detecting means provided in an air suction portion of the indoor radiator, and a temperature of the temperature detecting means are An air conditioner provided with a control device that opens the on-off valve for a certain period of time when the temperature of the refrigerant is below a predetermined temperature and the pressure of the refrigerant pressure detecting means is above a predetermined temperature. 2. The air conditioner according to claim 1, wherein when the pressure of the refrigerant pressure detecting means is equal to or higher than a predetermined pressure, the opening / closing valve is repeatedly opened for a certain period of time. 3. An indoor blower provided in an indoor heat exchanger, and an air flow rate detection means provided in the indoor blower, and when the air flow rate is small and the pressure of the refrigerant pressure detection means exceeds a predetermined value, the opening / closing valve is kept for a predetermined time. The said predetermined value which opens a valve is made small.
Air conditioner described.