JPH112472A - Operation control method of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the shortage of amount of liquid, to be circulated through an indoor machine, due to the staying of much amount of the liquid, capable of changing the phase thereof, in an outdoor machine by a method wherein a heat source charging amount in the outdoor machine is controlled based on the pressure of the liquid, which flows through the outdoor machine, while the heat source charging in the outdoor machine is stopped when the temperature of the fluid, which flows through the outdoor machine, has reduced to a value lower than a predetermined temperature. SOLUTION: The pressure and temperature of liquid R-134a, cooled in a heat exchanger 2 and condensed, are detected by a pressure sensor 25 and a temperature sensor 27 while the opening degree of a fuel regulating valve 23 is controlled so that a pressure, detected by the pressure sensor 25, becomes constant. When a temperature, detected by the temperature sensor 27, has become a predetermined temperature, or 5 deg.C, for example, the fuel regulating valve 23 is closed and combustion is stopped. When a level sensor 21 has detected the liquid R-134a and the liquid R-134a, whose amount is more than a predetermined amount, is stored in the heat exchanger 2, the fuel regulating valve 23 is closed to stop the combustion and the generation of cold heat is stopped.

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 an air conditioner between an outdoor unit and a plurality of indoor units, all or a majority of which are installed below the outdoor unit.
The present invention relates to control of an apparatus configured to circulate a phase-changeable fluid mainly by using a specific gravity difference between a liquid and a gas and to at least cool in each indoor unit.

[0002]

2. Description of the Related Art Conventionally, an air conditioner which does not require a power for conveying a phase-changeable fluid, that is, a fluid whose state changes between a liquid and a gas by taking in and out latent heat is shown in, for example, FIG. There is such a device. In this device, an outdoor unit 1 functioning as a condenser is installed at a high position in a building, and the outdoor unit 1 and an indoor unit 4 installed in a room to be air-conditioned at a lower position are installed. Liquid phase tube 6 between heat exchanger 5
And the liquid which is radiated and condensed by the outdoor unit 1 is supplied to the heat exchanger 5 of the indoor unit 4 via the liquid phase tube 6 by its own weight, while the heat exchanger of the indoor unit 4 is connected. 5. A gas that has absorbed heat and exchanged heat with room air having a high temperature in step 5 to be circulated through the gas phase pipe 7 to the outdoor unit 1 in which the fluid is condensed and has a low pressure. Therefore, there is an advantage that a transfer power such as an electric pump is not required, and the running cost can be suppressed. In addition, 8 is a flow control valve and 9 is a blower.

[0003]

However, in this type of air conditioner, if the pressure of the sealed phase-changeable fluid suddenly changes, boiling or bubbles are generated, and smooth circulation cannot be performed. , There was a risk of malfunctioning air conditioning.
In addition, there is a problem that a large amount of fluid that can change phase during the cooling operation accumulates in the outdoor unit in a liquid state and the amount circulated to the indoor unit may be insufficient. Had become.

[0004]

In order to solve the above-mentioned problems of the prior art, the present invention provides an outdoor unit functioning as a condenser,
Functions as an evaporator, and circulates a phase-changeable fluid mainly between the liquid phase and the gaseous phase between a plurality of indoor units, all or a majority of which are installed below the outdoor unit. ,
In the air conditioner configured to be capable of cooling in each indoor unit, while controlling the heat source input amount in the outdoor unit based on the pressure of the fluid flowing through the outdoor unit, the temperature of the fluid flowing through the outdoor unit is An operation control method according to a first configuration, in which the heat source input to the outdoor unit is stopped when the temperature falls below a predetermined temperature;

[0005] Between an outdoor unit comprising an absorption refrigerator and a plurality of indoor units, all or a majority of which are installed below the outdoor unit, a phase-changeable fluid is applied to a specific gravity difference between a liquid phase and a gas phase. Circulating using the discharge power of the cooling auxiliary pump installed in the liquid phase pipe, and configured to allow cooling in each indoor unit, on the suction side of the cooling auxiliary pump, open during heating operation, The discharge side of the heating pump is connected via an on-off valve that closes during the cooling operation, and the suction side of the heating pump is provided on the discharge side of the auxiliary cooling pump. It is connected between an on-off valve that closes during the heating operation and the indoor unit, absorbs heat from the outdoor unit and evaporates the gas into the indoor unit to radiate and condense, and discharges the condensed liquid to the discharge of the heating pump. The unit is returned to the outdoor unit by force, and each indoor unit can be heated. In the air conditioner, the first and second receiver tanks each having a liquid level detecting means are provided on the suction side of the auxiliary cooling pump and the heating pump, and the liquid level for detecting the liquid level of the fluid flowing through the outdoor unit is provided. Detecting means is provided, and during cooling operation, when the liquid level of the first receiver tank becomes equal to or higher than a predetermined level, the cooling auxiliary pump is started, and when the liquid level becomes equal to or lower than a predetermined level, the operation of the cooling auxiliary pump is stopped, and An operation control method according to a second configuration, in which the supply of the heat source in the outdoor unit is stopped when the liquid level of the fluid becomes equal to or higher than a predetermined level;

[0006] Between an outdoor unit consisting of an absorption refrigerator and a plurality of indoor units, all or a majority of which are installed below the outdoor unit, the phase-changeable fluid is subjected to the difference in specific gravity between the liquid phase and the gas phase. Circulating using the discharge power of the cooling auxiliary pump installed in the liquid phase pipe, and configured to allow cooling in each indoor unit, on the suction side of the cooling auxiliary pump, open during heating operation, The discharge side of the heating pump is connected via an on-off valve that closes during the cooling operation, and the suction side of the heating pump is provided on the discharge side of the auxiliary cooling pump. It is connected between an opening / closing valve that closes during the heating operation and the indoor unit, and introduces gas evaporated by absorbing heat in the outdoor unit into the indoor unit to radiate and condense the gas. The condensed liquid is discharged from the heating pump. The unit is returned to the outdoor unit by force, and each indoor unit can be heated. In the air conditioner, the first and second receiver tanks each having a liquid level detecting means are provided on the suction side of the auxiliary cooling pump and the heating pump, and the liquid level for detecting the liquid level of the fluid flowing through the outdoor unit is provided. Detecting means is provided, and during a heating operation, the heating pump is started when the liquid level of the second receiver tank is equal to or higher than a predetermined level, and when the liquid level is equal to or lower than the predetermined level, the operation of the heating pump is stopped. The operation of the heating pump is stopped when the liquid level of the outdoor unit becomes equal to or higher than a first predetermined level, and the heat source is turned on in the outdoor unit when the fluid level of the outdoor unit becomes equal to or lower than a second predetermined level lower than the first predetermined level. And an operation control method according to a third configuration in which the operation is stopped.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In these figures, the same reference numerals are given to the portions having the same functions as those described in FIG. 8 for easy understanding.

FIG. 1 shows an example of the configuration of an air conditioner controlled by the operation control method according to the present invention.
Can selectively generate cold or warm heat,
For example, an outdoor unit composed of an absorption refrigerator or the like, which is installed in a machine room or the like on the roof of a building, for example, and is sealed in a closed circuit 3 through a heat exchanger 2 piped inside an evaporator, for example. Transfer of heat to and from R-134a, which can easily evaporate when the pressure is reduced even at low temperatures, is performed.

As an absorption refrigerator capable of supplying cold or warm heat from the heat exchanger 2 connected to the evaporator, for example, one disclosed in Japanese Patent Application Laid-Open No. 7-318189 is disclosed. Can be used.

Reference numeral 5 denotes a heat exchanger of the indoor unit 4 installed in each room of the building. The heat exchanger 2 of the outdoor unit 1 is different from the heat exchanger 2 of the outdoor unit 1 as shown in FIG. The closed circuit 3 is formed by piping and connection by a valve 8.

The liquid-phase tube 6 is provided with a receiver tank 10 for storing the R-134a of the liquid radiated by the heat exchanger 2 of the outdoor unit 1 and condensed and flowing out, and the R-134a stored in the tank. The electric pump 11 for transporting 134a to the indoor unit 4 and the on-off valve 12 are installed in series, and in parallel with this path, the heat is condensed by performing a heating action in the heat exchanger 5 of the indoor unit 4, A receiver tank 13 for storing the R-134a of the liquid flowing out, and R-134 stored in the tank;
an electric pump 14 for returning a to the outdoor unit 1 and the on-off valve 1
5 in series, and receiver tanks 10 and 13 include:
Sensors 16 for detecting the liquid level at two locations above and below, respectively
And 17, 18 and 19 are provided.

In addition, an inlet / outlet portion of the heat exchanger 2 of the outdoor unit 1 is communicated, and a liquid level detecting tube 20 is installed in this portion.
Liquid level sensors 21 and 22 are also provided at two upper and lower positions of the liquid level detecting tube 20.

Reference numeral 23 denotes a fuel regulating valve provided on a fuel pipe connected to a burner 24 for heating an absorbing liquid (not shown) to evaporate and separate refrigerant vapor, and 25 flows out of the heat exchanger 2 to the liquid phase pipe 6. A pressure sensor for detecting the pressure of the R-134a, R-134a circulating through the closed circuit 3
A temperature sensor for detecting the temperature of 4a is provided. Temperature sensors 26 and 27 are provided at the entrance and exit of the heat exchanger 2, and temperature sensors 28 and 29 are provided at the exit of the heat exchanger 5.

The outdoor unit 1 is provided with an outdoor controller 30.
The indoor unit 4 is provided with an indoor control device 31. And
During the cooling operation, the outdoor controller 30 controls the pressure of the R-134a detected by the pressure sensor 25, that is, the R-134a that receives the cooling action in the heat exchanger 2, condenses, and discharges the liquid to the liquid phase pipe 6.
Is provided with a function of adjusting the opening of the fuel regulating valve 23 such that the pressure of the fuel cell reaches a predetermined pressure, for example, about 7.5 Pa when the R-134a condenses at 7 ° C., and the temperature sensor 27 detects the pressure. When the temperature of R-134a is reduced to a predetermined temperature, that is, condensed by the cooling action in the heat exchanger 2, and the temperature of R-134a discharged to the liquid phase tube 6 drops to, for example, 5 ° C. or less, the fuel regulating valve 23 is closed. During the heating operation, the temperature of the R-134a detected by the temperature sensor 26, that is, the heat exchanger 2 evaporates due to the heating action and the gas phase pipe 6
At a predetermined temperature, for example, 55
° C, a function of adjusting the opening of the fuel adjustment valve 23 is provided. The indoor control device 31 controls the temperature of the R-134a detected by the temperature sensor 29 during the cooling operation, that is, the heat exchanger 5. The temperature of the R-134a, which evaporates by performing a cooling action through the air, and rises to be discharged to the gas phase pipe 7, becomes a predetermined temperature,
For example, it has a function of adjusting the opening of the flow control valve 8 so as to be 12 ° C., and performs the heating action via the heat exchanger 5 during the heating operation, ie, the temperature of R-134a detected by the temperature sensor 28. It has a function of adjusting the opening of the flow control valve 8 so that the temperature of the R-134a condensed, lowered in temperature, and discharged to the liquid phase pipe 6 becomes a predetermined temperature, for example, 50 ° C.

A remote controller 32 communicable with the indoor controller 31 and capable of designating cooling and heating, starting and stopping operation, selecting the intensity of ventilation, setting the temperature, and the like is provided for each indoor unit 4.

In the outdoor unit 1, when the opening of the fuel regulating valve 23 is increased during the operation in the cooling mode, the fuel supplied to the burner 24 is increased to increase the thermal power. The amount of refrigerant flowing increases. The increased refrigerant vapor radiates heat in a condenser (not shown) and condenses, becomes a liquid, is supplied to the periphery of the heat exchanger 2, and takes heat from the R-134a flowing in the heat exchanger 2 to evaporate. The function of cooling the R-134a flowing in the heat exchanger 2 is strengthened, and if the flow rate is the same, the range of temperature decrease is increased. Conversely, when the opening degree of the fuel regulating valve 23 is reduced to reduce the thermal power of the burner 24, R-1 flowing through the heat exchanger 2 is reduced.
The function of cooling 34a is weakened, and the temperature reduction width is reduced. On the other hand, when the opening degree of the fuel adjustment valve 23 is increased during the operation in the heating mode to increase the thermal power by increasing the fuel supplied to the burner 24, the amount of the refrigerant that evaporates and separates from the absorption liquid (not shown) increases. The increased refrigerant vapor and the absorbing liquid that has been heated to evaporate and separate the refrigerant are supplied to the periphery of the heat exchanger 2 and radiate heat to the R-134a flowing through the heat exchanger 2. The function of heating the R-134a flowing through is increased, and if the flow rate is the same, the temperature rise width is increased. Conversely, when the opening of the fuel regulating valve 23 is reduced to reduce the thermal power of the burner 24, the R flowing through the heat exchanger 2 is reduced.
The function of heating -134a is weakened, and the temperature rise is reduced.

On the other hand, in the indoor unit 4, the flow control valve 8
Are the same, the larger the air conditioning load, the greater the temperature difference between R-134a detected by the temperature sensors 28 and 29, and the smaller the air conditioning load, the smaller the temperature difference.

Next, the circulation cycle of the R-134a enclosed in the closed circuit 3 will be described.
On the basis of the control signal output from the on-off valve 15, the on-off valve 15 is closed and the operation of the electric pump 14 is stopped.
2 is opened and the electric pump 11 is started to perform the operation. Then, in the outdoor unit 1, cold heat is generated as described above, and the R-134a is cooled by the cold heat through the tube wall of the heat exchanger 2, condensed, and condensed at 7.5 Pa and 7 ° C. The air is discharged to the pipe 6, accumulated in the receiver tank 10, and supplied to each indoor unit 4 by the transport force of the electric pump 11.

The operation of the electric pump 11 is controlled by the outdoor controller 30 as shown in FIG. 2, for example. That is, when the liquid level sensor 17 installed on the upper side of the receiver tank 10 detects R-134a, the electric pump 11 is operated, and the liquid level sensor 16 installed on the lower side does not detect R-134a. Sometimes, the operation of the electric pump 11 is stopped, and the liquid level sensor 16
Is detected, and when the liquid level sensor 17 does not detect R-134a, the operation is controlled so that the operation is continued if the electric pump 11 is operating, and the stop is continued if the electric pump 11 is stopped.

On the other hand, in each indoor unit 4, since the high temperature indoor air is forcibly supplied to the heat exchanger 5 by the blower 9, the liquid R-134a supplied from the outdoor unit 1 at 7 ° C. Removes heat from indoor air and evaporates to perform a cooling operation.

The gasified R-134a is cooled, condensed and liquefied, and flows into the low-pressure heat exchanger 2 of the outdoor unit 1 through the gas phase pipe 7.

In the circulation of the R-134a, when the cooling load in a certain indoor unit 4 increases (or decreases) and the temperature of the R-134a detected by the temperature sensor 29 of the indoor unit 4 increases (or decreases), In order to eliminate the rise in temperature (or decrease in temperature), the opening degree of the corresponding flow control valve 8 increases (or decreases) in response to a control signal from the indoor control device 31, and the indoor unit having an increased cooling load. Since the amount of R-134a flowing into the heat exchanger 5 of R4 increases (or decreases), R-13 detected by the temperature sensor 29 of R-134a increases.
The temperature rise (or decrease) of 4a is eliminated.

A change in the pressure and temperature of the R-134a in the indoor unit 4 due to a change in the cooling load has an immediate effect on the pressure of the R-134a detected by the pressure sensor 25 in the outdoor unit 1. That is, the temperature sensor 27 is R-134
In order to detect the change in the temperature of a, the effect appears only when the R-134a whose temperature has changed in the indoor unit 4 actually flows into the outdoor unit 1 (the heat conduction is negligible compared to the circulation speed of the R-134a). ), The change in the pressure of R-134a in the indoor unit 4 is transmitted to the outdoor unit 1 promptly.

Then, based on the pressure of R-134a excellent in responsiveness detected by the pressure sensor 25, the fuel control valve 2
3 is controlled. Specifically, when a change appears in the pressure of R-134a detected by the pressure sensor 25, the opening degree of the fuel adjustment valve 23 is volume-controlled by the outdoor control device 30 so as to eliminate the change.

The fuel regulating valve 23 is also controlled by the output of the temperature sensor 27. That is, the outdoor control device 30 is also connected to the temperature sensor 27, for example, as shown in FIG. 3, the temperature of R-134a detected by the temperature sensor 27, that is, R-13 cooled and condensed by the heat exchanger 2.
When the temperature of 4a is higher than a predetermined temperature, for example, 5 ° C.,
An instruction to continue heating by the burner 24 is given.
When the temperature of a becomes 5 ° C. or less, the fuel regulating valve 23
Combustion and stop by instructing valve closing.

When the fuel regulating valve 23 is closed and the heating by the burner 24 is stopped, the amount of the liquid refrigerant supplied around the heat exchanger 2 is rapidly reduced, and thereby the amount of generated cold heat is sharply reduced. Then, after a predetermined time, for example, three minutes, elapses, the temperature detection of the R-134a by the temperature sensor 27 is repeated.

By performing the above control, the outdoor unit 1 is controlled while controlling the opening degree of the fuel control valve 23, that is, the amount of cold generated for cooling the R-134a, based on the pressure which is more responsive than the temperature. It is possible to avoid a situation in which the refrigerant (water) of the absorption refrigeration machine that constitutes (1) freezes due to a supercooling phenomenon.

Further, the fuel regulating valve 23 is also controlled based on the liquid level of R-134a condensed in the heat exchanger 2. That is, the outdoor control device 30 is also connected to the liquid level sensor 21 installed on the lower side of the liquid level detection pipe 20, and for example, as shown in FIG.
a is not detected, the continuation of heating by the burner 24 is instructed. However, when the liquid level sensor 21 detects R-134a, the combustion is stopped by instructing the valve closing of the fuel regulating valve 23 to stop the combustion. Stop the occurrence.

When the fuel regulating valve 23 is closed and the heating by the burner 24 is stopped, the amount of the liquid refrigerant supplied to the periphery of the heat exchanger 2 sharply decreases as described above, and the temperature of the R-134a rises. For this reason, the pressure in this portion increases, whereby the R-134a in the heat exchanger 2 is easily discharged to the liquid phase tube 6. Then, after the elapse of a predetermined time, for example, three minutes, the detection of R-134a by the liquid level sensor 21 is repeated.

By performing the above-described control, it is possible to avoid a situation in which a large amount of the liquid R-134a accumulates in the outdoor unit 1 and the amount of R-134a circulating in the indoor unit 4 becomes insufficient.

Next, the on-off valve 12 is closed and the electric pump 1
The circulation cycle of R-134a during the heating operation performed by opening the on-off valve 15 and activating the electric pump 14 in the state where the operation of Step 1 is stopped, and the device control at that time will be described.

In the outdoor unit 1, heat is generated as described above, and this heat causes the R-134a to generate heat in the heat exchanger 2
Is heated through the pipe wall, and is evaporated and discharged to the gas phase pipe 7,
The heat is supplied to each heat exchanger 5 of the indoor unit 4 at a predetermined temperature, for example, 55 ° C.

In each indoor unit 4, since the low temperature indoor air is forcibly supplied to the heat exchanger 5 by the blower 9, the R-gas of the gas supplied from the outdoor unit 1 at 55 ° C.
134a radiates heat to indoor air and condenses, thereby performing a heating action.

Then, R-134 which has been condensed into a liquid is obtained.
a is stored in the receiver tank 13 and sent to the heat exchanger 2 of the outdoor unit 1 through the liquid phase tube 6 by the electric pump 14.

At this time, the electric pump 14 is controlled by the outdoor controller 30 as shown in FIG. 5, for example.
That is, when the liquid level sensor 19 installed on the upper side of the receiver tank 13 detects R-134a, the electric pump 14 is operated, and the liquid level sensor 18 installed on the lower side is detected.
Does not detect R-134a, the electric pump 1
4, the liquid level sensor 18 detects R-134a, and the liquid level sensor 19 does not detect R-134a. If the electric pump 14 is in operation, the operation is continued, and If so, control is performed to continue the stop.

Further, the electric pump 14 is also controlled on the basis of the liquid level of R-134a which has been heated and evaporated in the heat exchanger 2. That is, the outdoor control device 30 is also connected to the liquid level sensor 22 installed on the upper side of the liquid level detection tube 20, and for example, as shown in FIG.
2 does not detect R-134a, it instructs the electric pump 14 to continue operating.
When 134a is detected, the operation stop of the electric pump 14 is instructed.

By controlling the electric pump 14 in this manner, a situation in which the liquid R-134a flows into the gas phase pipe 7 is avoided. Then, the detection of R-134a by the liquid level sensor 22 is repeated after a predetermined time, for example, one minute has elapsed.

In the circulation of R-134a,
The heating load in a certain indoor unit 4 increases (or decreases)
R-13 detected by the temperature sensor 28 of the indoor unit 4
When the temperature of 4a decreases (or rises), the opening of the corresponding flow control valve 8 increases (or receives a control signal from the indoor control device 31) so that the temperature decrease (or temperature rise) disappears. Since the amount of R-134a flowing into the heat exchanger 5 of the indoor unit 4 whose heating load has increased increases (or decreases), the temperature of the R-134a detected by the temperature sensor 29 decreases (or increases). ) Will be resolved.

The R-134a whose temperature has changed due to the change in the heating load flows into the outdoor unit 1 or the flow rate of the R-134a flowing into the outdoor unit 1 changes, and the temperature sensor 26 detects the change. When the temperature of the R-134a changes, the outdoor control device 30 controls the opening of the fuel adjustment valve 23 so as to eliminate the change.

The fuel regulating valve 23 is provided with a liquid level sensor 21.
Is also controlled by the output of That is, the fuel regulating valve 2
3, when the liquid level sensor 21 detects the R-134a as shown in, for example, FIG. 7, the outdoor controller 30 instructs the continuation of heating by the burner 24.
When the liquid level sensor 21 does not detect R-134a, an instruction is given to close the fuel adjustment valve 23 and stop heating by the burner 24.

By the above control, the heating by the burner 24 when the R-134a of the liquid is insufficient, that is, the so-called idling is avoided. Then, after the elapse of a predetermined time, for example, three minutes, the detection of R-134a by the liquid level sensor 21 is repeated.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

For example, the temperature sensors 28 and 29 are installed so as to detect a change in the temperature of the indoor air blown to the heat exchanger 5, and the temperature sensors 28 and 29 are replaced with the R at the entrance and exit of the heat exchanger 5. A pressure sensor capable of detecting a pressure difference of −134a may be provided and output to the indoor control device 31 as an air conditioning load.

The phase-changeable fluid sealed in the closed circuit 3 may be R-407c or R-407c in addition to R-134a.
-404A, R-410c, etc., which can transfer heat by latent heat may be used.

[0045]

As described above, according to the first aspect of the present invention, the amount of cold generated is controlled based on the pressure which is more responsive than the temperature, and the absorption type of the outdoor unit is constituted. The situation that the refrigerant (water) of the refrigerator freezes can be reliably avoided.

Further, according to the second aspect of the present invention, it is possible to avoid a situation in which a large amount of phase changeable liquid accumulates in the outdoor unit and the amount circulated to the indoor unit is insufficient.

According to the third aspect of the present invention, it is possible to avoid a situation in which a phase-changeable fluid flows as a liquid from the outdoor unit functioning as an evaporator into the gas phase pipe. Empty boiler in is avoided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an apparatus configuration.

FIG. 2 is an explanatory diagram of control of a cooling auxiliary pump.

FIG. 3 is an explanatory diagram of control for preventing supercooling.

FIG. 4 is an explanatory diagram of control for preventing a circulating amount shortage of a phase-changeable fluid.

FIG. 5 is an explanatory diagram of control of a heating pump.

FIG. 6 is an explanatory diagram of control for preventing a phase-changeable fluid from flowing into a gas-phase tube as a liquid.

FIG. 7 is an explanatory diagram of a control example for preventing empty heating in an outdoor unit.

FIG. 8 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Heat exchanger 3 Closed circuit 4 Indoor unit 5 Heat exchanger 6 Liquid phase pipe 7 Gas phase pipe 8 Flow control valve 9 Blower 10 Receiver tank 11 Electric pump 12 On / off valve 13 Receiver tank 14 Electric pump 15 On / off valve 16 １９19 Liquid level sensor 20 Liquid level detecting tube 21 ・ 22 Liquid level sensor 23 Fuel regulating valve 24 Burner 25 Pressure sensor 26∼29 Temperature sensor 30 Outdoor control device 31 Indoor control device 32 Remote control

Claims (3)

[Claims] A liquid mainly capable of phase change between an outdoor unit functioning as a condenser and a plurality of indoor units functioning as an evaporator, all or a majority of which are installed below the outdoor unit, is mainly liquid. In an air conditioner configured to circulate by utilizing the specific gravity difference between the phase and the gas phase and capable of cooling in each indoor unit, a heat source input amount in the outdoor unit is controlled based on a pressure of the fluid flowing through the outdoor unit. And an operation control method of the air conditioner, wherein when the temperature of the fluid flowing through the outdoor unit falls below a predetermined temperature, the input of the heat source in the outdoor unit is stopped. 2. The method according to claim 1, wherein the phase-changeable fluid is a specific gravity of a liquid phase and a gas phase between an outdoor unit comprising an absorption refrigerator and a plurality of indoor units, all or a majority of which are installed below the outdoor unit. Circulation is performed by utilizing the difference and the discharge power of the auxiliary cooling pump installed in the liquid phase pipe, so that cooling can be performed in each indoor unit, and the suction side of the auxiliary cooling pump is opened during heating operation. Connecting the discharge side of the heating pump through an on-off valve that closes during the cooling operation, and providing the suction side of the heating pump on the discharge side of the auxiliary cooling pump; A gas that is connected between an opening / closing valve that closes during a heating operation and the indoor unit and that absorbs heat from the outdoor unit and evaporates to the indoor unit to radiate and condense the liquid; Return to the outdoor unit with the discharge force of In the air conditioner thus constructed, first and second receiver tanks each having a liquid level detecting means are provided on the suction side of a cooling auxiliary pump and a heating pump, and a liquid level of the fluid flowing through the outdoor unit is detected. Surface detecting means is provided, and during cooling operation, when the liquid level of the first receiver tank becomes equal to or higher than a predetermined level, the auxiliary cooling pump is started, and when the liquid level becomes equal to or lower than the predetermined level, the operation of the auxiliary cooling pump is stopped. An operation control method for an air conditioner, wherein the input of a heat source in the outdoor unit is stopped when the liquid level of the fluid becomes equal to or higher than a predetermined level. 3. The method according to claim 1, wherein a phase-changeable fluid is provided between an outdoor unit comprising an absorption refrigerator and a plurality of indoor units, all or a majority of which are installed below the outdoor unit. Circulation is performed by utilizing the difference and the discharge power of the auxiliary cooling pump installed in the liquid phase pipe, so that cooling can be performed in each indoor unit, and the suction side of the auxiliary cooling pump is opened during heating operation. Connecting the discharge side of the heating pump through an on-off valve that closes during the cooling operation, and providing the suction side of the heating pump on the discharge side of the auxiliary cooling pump; The gas is connected between an opening / closing valve that closes during the heating operation and the indoor unit, and the gas absorbed by the outdoor unit and absorbed and evaporated is introduced into the indoor unit to radiate and condense. Return to the outdoor unit with the discharge force of In the air conditioner thus constructed, first and second receiver tanks each having a liquid level detecting means are provided on the suction side of a cooling auxiliary pump and a heating pump, and a liquid level of the fluid flowing through the outdoor unit is detected. A surface detecting means is provided, and during the heating operation, the heating pump is started when the liquid level of the second receiver tank is equal to or higher than a predetermined level, and the operation of the heating pump is stopped when the liquid level is equal to or lower than the predetermined level. When the liquid level of the fluid becomes equal to or higher than a first predetermined level, the operation of the heating pump is stopped, and when the fluid level in the outdoor unit becomes equal to or lower than a second predetermined level lower than the first predetermined level, the heat source in the outdoor unit An operation control method for an air conditioner, wherein the operation is stopped.