JPH10274448A - Air-conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the dew formation of a steam onto an air-conditioning case surface for accommodating the other evaporator in an air-conditioning device that has at least two evaporators and circulating a refrigerant to the other evaporator at each specific time for a small amount of time when performing cooling with one evaporator and stopping the other. SOLUTION: A solenoid valve 192 corresponding to an indoor heat exchanger 52 where cooling is at halt is opened for two minutes at every 28 minutes and at the where time a blast fan 152 is operated. By opening the solenoid valve 192 for two minutes, the indoor heat exchanger 52 itself can be cooled. However, since a higher temperature indoor air than the heat exchanger is blown into an air-conditioning case 71, the blown air can absorb the cool air of the indoor heat exchanger 52, thus suppressing the decrease in the temperature of the air-conditioning case 71 for accommodating the indoor heat exchanger 52 and hence relaxing a temperature difference to air near the surface of the airconditioning case 71 and suppressing the dew formation of steam onto the surface of the air-conditioning case 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for condensing refrigerant from a compressor in a condenser,
The present invention relates to an air conditioner in which air is evaporated by two evaporators, and heat is exchanged between air and refrigerant by the evaporators to perform cooling.

[0002]

2. Description of the Related Art Conventionally, as an air conditioner of this type, Japanese Patent Application Laid-Open No. Hei 1-196462 discloses that two evaporators are provided in parallel, and a solenoid valve and a throttle channel are provided upstream of each of these evaporators. Provisions have been made. When the electromagnetic valve corresponding to one of the evaporators is opened and the air is cooled in one of the evaporators, and the electromagnetic valve corresponding to the other evaporator is closed to stop the cooling by the other evaporator, a certain period of time (for example, 5
Each time), the operation of opening the electromagnetic valve on the evaporator side during the cooling stop is performed in a unit of several minutes.

In this way, the compressor oil accumulated in the evaporator during the cooling stop is swept away, and the amount of the compressor oil in the refrigerant circulating in the refrigerant circuit of the air conditioner is prevented from being greatly reduced. Failure is prevented.

[0004]

Meanwhile, the evaporator is cooled while the refrigerant flows through the evaporator during the cooling stop in a unit of several minutes, and the air in the air-conditioning case accommodating the evaporator is further reduced. Because it is cooled and the air conditioning case itself is cooled,
There has been a problem that the temperature difference with the air existing near the air conditioning case surface increases, and the water vapor in the air condenses on the air conditioning case surface, and the condensed water drops into the space to be cooled.

[0005] The present invention has been made in view of the above points,
An air conditioner that includes at least two evaporators and that circulates refrigerant to the other evaporator for a short period of time every predetermined time when cooling is performed on one side and the other is stopped. The purpose is to suppress the condensation of water vapor on water.

[0006]

In order to achieve the above object, according to the first to fifth aspects of the present invention, the first evaporator (51) performs cooling and the second evaporator (52).
When cooling is not performed at the time, the second valve means (192) for interrupting the flow of the refrigerant to the second evaporator (52) is opened for a very short time (T2) every time the predetermined time (T1) elapses,
When the second valve means (192) is opened, the second evaporator (5) is opened.
The second air-blowing means (152) for blowing air into the second air-conditioning case (7) containing the first and second air-conditioners (1, 52) is operated.

Therefore, while the second evaporator (52) is stopped, the second valve means (192) every time a predetermined time (T1) elapses.
The second evaporator (52) itself is cooled by opening the valve, but the air in the space to be cooled, which is higher in temperature than the second evaporator (52), is sucked into the second air-conditioning case (71). Since air is blown from the port (72) to the air outlet (73), the blown air can absorb the cool air of the second evaporator (52).

Accordingly, the temperature of the air in the second air-conditioning case (71) can be prevented from lowering.
1) Since the temperature of the second air conditioning case (71) can be prevented from lowering, the temperature difference with the air near the surface of the second air conditioning case (71) can be reduced. Problems such as condensation water dropping into the cooling space can be suppressed.

The present invention is applied to an air conditioner having at least two evaporators, and performs cooling by at least one of these evaporators and stops cooling by at least one of the evaporators. In the claims, the evaporator during cooling is expressed as a first evaporator in the claims, and the evaporator during the cooling stop is expressed as a second evaporator in the claims.

[0010] In the invention according to claim 3, the first,
The air blowing amount of the second air blowing means (151, 152) can be switched to at least two stages of a low air blowing amount and a high air blowing amount, and the second valve means (192) is opened for the short time (T2). In this case, since the amount of air blown by the second air blowing means (152) is set to be low, the amount of cool air blown when cooling is stopped can be reduced.

According to the fourth aspect of the present invention, the air direction adjusting member (74) is provided at the air outlet (73) of the air conditioning case (71), and the air conditioning case (71) is attached to the ceiling (7) of the space to be cooled. ), And when the second valve means (192) is opened for the very short time (T2), the air outlet (7
Air is blown out from 3) along the ceiling (7).

Therefore, while the second evaporator (52) is stopped, the air from the air outlet (73) of the air conditioning case (71) does not blow out below the space to be cooled. It can be suppressed that air is blown directly to an existing person. In addition, by reversing the flow of the refrigerant in the air conditioner described above, the condenser (9) acts as an evaporator, and the first and second evaporators (51, 52). The above-mentioned means can be applied to a heat pump type air conditioner in which the above-mentioned) acts as a condenser.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. (First Embodiment) Hereinafter, an air conditioner according to the present invention is an engine-driven heat pump type which performs air conditioning of a plurality (three in this embodiment) of a room using a water-cooled engine as a drive source of a compressor. An example in which the present invention is applied to an air conditioner will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of a heat pump type air conditioner. In this embodiment, a CFC-based refrigerant is used. First, the overall configuration will be described. Reference numeral 2 denotes a compressor that is driven by a water-cooled engine 1 and compresses a refrigerant. Reference numeral 3 denotes a compressor that separates the refrigerant and compressor oil and temporarily stores the compressor oil in the refrigerant. It is an oil separator that can be temporarily stored. Numeral 4 denotes a four-way valve which is located on the discharge side of the compressor 2 and switches the flow direction of the refrigerant to be discharged. Numerals 51, 52 and 53 function as evaporators during cooling and condense during heating. It is an indoor heat exchanger that works as a vessel.

Numerals 61, 62 and 63 denote expansion valves for cooling (decompression means for cooling) for decompressing and expanding the refrigerant during cooling, and 8 an expansion valve for heating (decompression for heating) which decompresses and expands the refrigerant during heating. Means). 9 is an outdoor heat exchanger that works as a condenser during cooling and works as an evaporator during heating, and 10 is a refrigerant heater that heats the refrigerant with engine cooling water (warm water) warmed by engine exhaust heat. is there.
An accumulator 11 is provided on the suction side of the compressor 2 and separates the refrigerant into gas and liquid and discharges the gas refrigerant.

Then, from the first port 4a of the four-way valve 4,
Indoor heat exchangers 51, 52, 53, cooling expansion valves 61, 6
2, 63, the first refrigerant pipe line 12 reaching the second port 4b of the four-way valve 4 via the heating expansion valve 8, the outdoor heat exchanger 9, and the refrigerant heater 10, and the third port 4c of the four-way valve 4, The compressor 2, the oil separator 3, the four-way valve 4, and the indoor heat exchangers 51 and 52 are provided by the second refrigerant pipe 13 that reaches the fourth port 4 d of the four-way valve 4 via the accumulator 11, the compressor 2, and the oil separator 3. , 53, cooling expansion valves 61, 62, 6
3, heating expansion valve 8, outdoor heat exchanger 9, refrigerant heater 1
0 and the accumulator 11 are connected to each other to form a refrigeration cycle.

In the refrigerant pipe 12, the cooling expansion valve 6
In the vicinity of 1, 62, 63, indoor heat exchangers 51, 52, 5
Solenoid valve 19 for the indoor heat exchanger for interrupting the refrigerant flow to
1, 192 and 193 are provided. In addition, the indoor heat exchanger 51,
Air is blown to each of 52 and 53. The air volume of these indoor fans 151, 152, 153 is 5
It is possible to switch to stages (blowing amount LL = 14 m ³ /
min, air volume L = 20 m ³ / min, air volume M = 24
m ³ / min, air volume H = 27 m ³ / min, air volume H
H = 31 m ³ / min).

The indoor heat exchangers 51, 52, 5
3. Cooling expansion valves 61, 62, 63, indoor heat exchanger solenoid valves 191, 192, 193, and indoor fan 15
1, 152, 153, indoor units 201, 202, 2
03. The indoor units 201, 202, 20
3 has three units arranged in parallel, and all have the same configuration and operation. These indoor units 201, 202, 203
As shown in FIG. 2, are arranged on ceiling plates 7 in independent rooms.

An electromagnetic valve 22 for the outdoor heat exchanger for interrupting the flow of the refrigerant to the outdoor heat exchanger 9 is provided near the expansion valve 8 for heating in the refrigerant pipe 12. Also,
The outdoor fan 16 blows air to the outdoor heat exchanger 9 and a radiator 18 described later. here,
As is well known, each of the expansion valves 61, 62, 63, and 8 detects a refrigerant temperature and a refrigerant pressure at the outlet of the heat exchanger on the evaporator side with a sensor group S (see FIG. 3). An electronic expansion valve that controls a valve opening degree according to a detection signal from the sensor group S so that the dryness after decompression and expansion becomes zero is used. Further, the above-described solenoid valve 19
1, 192, 193, and 22 are normally-closed solenoid valves that open only when energized, and have built-in check valves that allow refrigerant flow only in the direction indicated by black arrows in FIG. I have.

A circuit for circulating the cooling water of the engine 1 returns from the engine 1 through the thermostat 17 to the engine 1 through a radiator 18 that radiates the cooling water,
Refrigerant heater 1 from engine 1 via thermostat 17
0 and a circuit that returns to the engine 1. Next, a specific structure of the refrigerators 201, 202, and 203 will be described with reference to FIGS. First, the indoor heat exchangers 51, 52 and 53 are provided with an elongated refrigerant pipe 5a.
Are provided spirally along the rectangular cylindrical shape on the outer peripheral portions of the indoor fans 151, 152, 153, and the heat transfer fins 5b for promoting heat exchange are provided in the refrigerant pipe 5a in a comb-like manner. Have been. Indoor fan 15
1, 152 and 153 are provided with a centrifugal multi-blade fan F made of resin (for example, ABS resin) and an electric motor M for driving the fan F. The amount of rotation, that is, the indoor fans 151, 1
52 and 153 are switched.

The indoor heat exchangers 51, 52, 5
The air conditioner 3 and the indoor fans 151, 152, 153 are built in the air-conditioning case 71, and the air-conditioning case 71 is attached to the ceiling plate 7. The air conditioning case 71 can be divided into a rectangular box-shaped case portion 71a having an open lower surface and a lid portion 71b for closing the lower surface. Case part 71
“a” has a double structure in which the inside is made of a heat insulating material (for example, styrene foam) and the outside is made of a metal material (for example, stainless steel). The lid 71b is made of a resin material (for example, ABS resin).

Inside the upper surface of the case portion 71a and inside the lid portion 71b, a support portion 71 having a U-shaped cross section for supporting the upper and lower ends of the indoor heat exchangers 51, 52, 53 is provided.
1 and 712 are formed to protrude.
A heat insulating member 75 made of a heat insulating material is partially provided between 712 and the upper and lower ends of the indoor heat exchangers 51, 52, 53.

Since the dew water condensed on the indoor heat exchangers 51, 52, and 53 accumulates inside the lower support portion 712, the dew water is condensed on a portion of the support portion 712 where the heat insulating member 75 is not provided. Discharge hose (not shown) for discharging air
Is arranged at one end. The other end of the discharge hose is disposed outside the room, and an electric pump that sends condensed water from one end to the other end is provided. In the air-conditioning case 71, the inlet / outlet pipes A and B of the indoor heat exchangers 51, 52 and 53 are provided.
Is insulated by a rubber grommet 76.

At the center of the lid 71b (in other words, the lower surface of the air-conditioning case 71), the indoor fans 151, 152, 15
A bell mouth-shaped air suction port 72 is formed to correspond to the suction port of the fan F of No. 3, and the outer edge of the lid 71b corresponds to the outer circumference of the indoor heat exchangers 51, 52, and 53. A rectangular air outlet 73 is formed. The air outlet 73 is provided with louvers (wind direction adjusting members) 741, 742, and 743 for adjusting the wind direction of the blown air.
The louvers 741, 742, and 743 can be set at five positions at intervals of 18 degrees from the position indicated by the dotted line in FIG.

Then, the indoor fans 151, 152, 15
By actuating the fan 3, the fan F
And inhale the air in the axially outward direction (in other words, the indoor heat exchangers 51, 52, 53).
Side), and the indoor heat exchangers 51, 52,
After the heat exchange at 53, the air is blown into the room from the air outlet 73.

Next, a control system of the air conditioner having the above structure will be described. A control panel (not shown) in each room is provided with cooling / heating switching switches 101, 102, and 103 (see FIG. 3) for switching between cooling and heating of each room. These switches 101, 10
2, 103 are provided with a cooling switch for instructing cooling, a heating switch for instructing heating, and an off switch for turning off cooling and heating, which can be switched by manual operation by a person. In addition, wind direction changeover switches 114, 124, 134 for switching the directions of the louvers 741, 742, 743 of the air outlets 73 of the respective rooms, and fan switches 115, 125 for changing the amount of air blown by the indoor fans 151, 152, 153, 135 is also provided, and these switches can also be switched by manual operation of a person.

All the switches 101, 102,
103, 114, 124, 134, 115, 125, 1
35, and a signal from the sensor group S are input to the electric control device 100. Based on the input signal, the engine 1 (compressor 2), the four-way valve 4, the cooling expansion valve 6
1, 62, 63, heating expansion valve 8, indoor fan 151,
152, 153, outdoor fan 16, solenoid valves 191, 19
2, 193, 22 and the louvers 741, 742, 743 are controlled.

Here, for example, a cooling / heating switching switch 101
When the cooling switch is turned on, the control device 1 first outputs a predetermined first pulse signal to indicate that cooling has been instructed.
00, and then outputs a predetermined second pulse signal to input to the control device 100 that one of the three switches 101, 102, and 103 has been turned on.

Similarly, a cooling / heating switching switch 101,
102 and 103 output a predetermined first pulse signal corresponding to each of the cooling, heating, and off switches, and thereafter,
A predetermined second pulse signal corresponding to each of the switch 101, the switch 102, and the switch 103 is output. In addition, cooling / heating changeover switches 101, 10
When the cooling switch of any one of the switches (for example, 101) is turned on first from the state where all of the switches are turned off, the cooling signal is instructed by this output signal. Other switches (eg, 102,
Even if the heating switch of 103) is turned on by a person, it does not switch to heating, and the other switches remain off. The same applies when the heating switch is turned on first.

Next, the operation of the present embodiment in the above configuration will be described. First, all the cooling / heating changeover switches 10
The case where the cooling operation is instructed in 1, 102 and 103 will be described. In addition, the flow of the refrigerant at the time of cooling operation is shown by the dotted arrow in FIG. Air conditioning switch 101,
At the same time when the cooling switches 102 and 103 are turned on, the engine 1 starts operating, the compressor 2 operates, the four-way valve 4 rotates to the position shown by the dotted line in FIG. 1, and the indoor fans 151, 152,
153, the outdoor fan 16 operates. Further, the heating expansion valve 8 is fully opened and does not perform the decompression and expansion of the refrigerant, and the cooling expansion valves 61, 62 and 63 are operated so as to perform the decompression and expansion of the refrigerant. The cooling operation starts in this way,
Refrigerant begins to circulate.

The high-temperature and high-pressure refrigerant that has left the compressor 2 passes through the oil separator 3 to separate the oil, and then passes through the fourth port 4d of the four-way valve 4 through the second port 4b, and the refrigerant heater 10 Pass through. During this cooling,
The engine coolant is circulated only to the radiator 18 without circulating the engine coolant to the refrigerant heater 10. The refrigerant that has exited the refrigerant heater 10 enters the outdoor heat exchanger 9 serving as a condenser, where the refrigerant radiates heat to the outside air and condenses.

The liquid refrigerant that has exited the outdoor heat exchanger 9 passes through the heating expansion valve 8 that has been fully opened, and the cooling expansion valves 61 and 6.
The indoor heat exchangers 51, 52, and 53, which are decompressed and expanded by 2, 63 and become evaporators, enter the indoor heat exchangers 51, 52, and 53.
Evaporates at 52 and 53 to perform indoor air heat absorption. Thereby, indoor cooling is performed. Indoor heat exchangers 51, 52, 5
The refrigerant that has exited 3 enters the accumulator 11 from the first port 4a of the four-way valve 4 via the third port 4c. After being separated by the accumulator 11 into gas and liquid, the gas-phase refrigerant is sucked into the compressor 2.

Next, the cooling / heating switching switches 101, 10
A description will be given of the case where the heating operation is instructed in steps 2 and 103. However, the flow basically flows in a reverse direction to the cooling operation as is well known, so that the description mainly focuses on the differences from the cooling operation, and the other description is omitted. I do. Air conditioning switch 10
At the same time as the heating switches 1, 102, and 103 are turned on, the four-way valve 4 rotates to the position shown by the solid line in FIG. 1, performs the decompression and expansion of the refrigerant by the expansion valve 8 for heating, and the expansion valve 61 for cooling. 62 and 63 are fully opened and operated so as not to perform the decompression and expansion of the refrigerant. In this way, the cooling operation starts and the refrigerant starts to circulate.

The refrigerant is condensed in the indoor heat exchangers 51, 52 and 53 serving as condensers and radiates heat to room air, and is evaporated in the outdoor heat exchanger 9 serving as an evaporator and absorbs heat from outside air. ,
The same cycle as in the cooling operation is performed except that the refrigerant heater 10 absorbs heat from engine cooling. As described above, the room is heated by the heat radiation of the outside air in the indoor heat exchangers 51, 52, and 53.

In the normal heating operation, the cooling water of the engine 1 exchanges heat with the refrigerant in the refrigerant heater 10 via the thermostat 17 from the engine 1, is cooled, and returns to the engine 1. Further, when the load of the refrigeration cycle rises and the cooling water temperature rises, and when this cooling water temperature becomes higher than the set temperature of the thermostat 17, the thermostat 17 operates and cools to the radiator 18 side. Water flows, radiator 1
Heat is released at 8.

Next, three cooling / heating switching switches 101,
FIG. 4 is a block diagram showing a case where at least one of the switches 102 and 103 is in the cooling state, and FIG.
This will be described based on the time chart shown in FIG. First, from the state where the three switches 101, 102 and 103 are off,
When the cooling switch of one switch (for example, 101) is turned on, the start of cooling is determined by cooling start determination means A.
Judge. At this time, regarding the switches 102 and 103 whose cooling switches are off, the indoor fans 202 and 2
03 is stopped, the solenoid valves 192 and 193 are closed,
The solenoid valves 62 and 63 are fully open.

Subsequently, when the cooling-stop refrigerator presence / absence determining means B determines that there are the switches 102 and 103 whose cooling switches are not turned on, that is, there are the refrigerators 202 and 203 in the cooling-stop state, the control is performed. The one switch 101 is operated by a timer 107 built in the means 100.
The cooling stop time of the cooling stop refrigerator after the cooling switch is turned on is counted.

Here, the cooling stop time is the first predetermined time T1.
If the cooling switch of the switch 103 is turned on within (for example, 28 minutes), cooling by the refrigerator 203 related to the switch 103 is started. Then, when the cooling stop time reaches the first predetermined time T1 (time t in FIG. 5).
1) Regarding the switch 102 that is in the cooling-off state, the solenoid valve 192 is opened by energizing the solenoid valve 192 by the solenoid valve opening control C, and the blower fan operation control D is
The indoor fan 152 is energized to operate the indoor fan 152 at the above-mentioned air flow rate LL, and the louver 742 is forcibly driven to the position shown by the dotted line in FIG.
By these controls C, D, and E, an oil extrusion control F for extruding compressor oil staying in the refrigerator 202 in the cooling-off state with the circulating refrigerant during the cooling-off time is performed.

At the same time as the start of the oil extruding control F, the timer 107 counts the duration of the control F, and the duration of the control F is a second predetermined time T2 (for example, shorter than the first predetermined time T1). (Two minutes) (time t2 in FIG. 5), the solenoid valve 19 is controlled by the solenoid valve closing control G.
2, the electromagnetic valve 192 is closed, the blower fan stop control H shuts off the power to the indoor fan 152 to stop the indoor fan 152, and the louver 742 is turned off by the louver position return control I. To the position before performing the louver position control E. With these controls G, H, and I, the cooling re-stop control J for returning from the oil extrusion control F to the normal cooling stop state is performed.

As described above, every time the first predetermined time T1 elapses after the supply of the refrigerant to the indoor heat exchanger 52 is stopped, the indoor unit 202 including the indoor heat exchanger 52 only for the second predetermined time T2. By supplying the refrigerant to the indoor unit 202, it is possible to prevent compressor oil from staying inside the indoor unit 202.
Further, during the second predetermined time T2, that is, the indoor unit 20
By activating the indoor fan 152 while the refrigerant is circulating through the cooling medium 2, the air blown from the fan 152 can absorb the cool air from the indoor heat exchanger 52. Therefore,
The temperature of the air in the air-conditioning case 71 that accommodates the indoor heat exchanger 52 can be suppressed from lowering, and the temperature of the air-conditioning case 71 itself can be suppressed from lowering. Thus, the condensation of water vapor on the surface of the air-conditioning case 71 can be suppressed, and the problem that the condensed water drops in the room can be suppressed.

Particularly, in this embodiment, since the lid 71b is made of resin and is not provided with a heat insulating material, the indoor heat exchanger 5
Although it is easy to receive the cold air of 1, 52, and 53, and the dew condensation water easily falls in the room, the problem of the dew condensation water fall can be effectively suppressed by applying the present invention. Also, during the second predetermined time T2, since the blown air is blown substantially horizontally by the louver 742, the air is not blown toward the person in the room.

The required amount of oil in the circulating refrigerant (in other words, the amount of compressor oil that does not cause seizure of the compressor 2) is set, and the total amount of oil filled in the refrigeration cycle of this air conditioner is set. The time required for the amount of oil obtained by subtracting the above-mentioned required oil amount from staying in the stopped indoor unit 202 is defined as the first predetermined time T1,
It is not limited to 28 minutes. The time during which the oil retained in the stopped indoor unit 202 can be extruded is determined by the second time.
The predetermined time T2 is set, and is not limited to two minutes.

Next, the effect of preventing dew condensation according to the present invention will be described using comparative examples. First, in the present invention having the above-described structure and operation, the graph of FIG. 6A shows the result of measuring the surface temperature of the lower surface of the air-conditioning case 71 (that is, the lid 71b). Also, during the second predetermined time T2, the solenoid valve 192
FIG. 6B is a graph showing the result of measuring the surface temperature of the lid 71b of the air-conditioning case 71 in a comparative example in which only the indoor fan 152 was not operated by operating only the indoor fan 152.

The temperature around the indoor unit 202 before the measurement is 23 ° C., the relative humidity around the indoor unit 202 is 60%, and the dew point temperature at this time is 15 ° C. The heat exchange capacity of the indoor heat exchangers 51, 52, 53 is 10.5k.
W, the blowing capacity of the indoor fans 151, 152, 153 is 3
It is 1 m ³ / min. As a result, in the comparative example in which the indoor fan 152 is not operated during the second predetermined time T2, the operation indicated by the first predetermined time T1 and the second predetermined time T2 is repeated, so that the lower surface of the air-conditioning case 71 is gradually reduced. It can be seen that the surface temperature decreases and becomes lower than the dew point temperature (the portion indicated by oblique lines in FIG. 6B). For this reason, it turned out that dew forms on the surface of the air conditioning case 71.

On the other hand, in the present invention, it is understood that the surface temperature of the lid 71b of the air-conditioning case 71 does not decrease so much even if the operation indicated by the first predetermined time T1 and the second predetermined time T2 is repeated. Therefore, dew condensation on the surface of the air conditioning case 71 can be prevented. (Other Embodiments) In the above embodiment, the indoor heat exchanger 52
When only the solenoid valve 192 is stopped, the indoor fan 152 is also energized while the electromagnetic valve 192 is energized. However, while the electromagnetic valve 192 is energized, the indoor fan 152 may be intermittently energized. The indoor fan 152 may be energized with a delay after energizing the valve 192, and the energization of the indoor fan 152 may be delayed with a delay after energizing the solenoid valve 192. Here, since the indoor heat exchanger 52 and surrounding components are cooled slightly after the energization of the electromagnetic valve 192 is started, the dew condensation is more effectively performed by energizing the indoor fan 152 with a delay. Can be prevented.

Further, in the above embodiment, the cooling / heating switching 101, 102, 103 is switched by the manual operation of the person to instruct the stop of the cooling and heating operations. However, the invention is not limited to this. The desired temperature (cooling, heating) is set by the temperature setting device of the control panel, and various signals such as the instruction of the set temperature (cooling, heating), room temperature, outside air temperature, solar radiation, evaporator air temperature, etc. are electrically controlled. Apparatus 10
0, and based on this signal, the electric control unit 100
Calculates the amount of heat required to bring the indoor temperature close to the set temperature, and calculates the amount of air blown by the blower fans 151, 152, 153, the directions of the louvers 741, 742, 743, the electromagnetic valve 6 and the like.
By automatic control for controlling opening and closing of 1, 62, 63, etc.,
It may be instructed to stop the operation of cooling and heating.

In the above embodiment, the indoor heat exchanger 5
When 1, 52, and 53 work as evaporators, solenoid valves 191, 192, and 193 are disposed upstream of the refrigerant flow of the indoor heat exchangers 51, 52, and 53. However, the present invention is not limited to this. Electromagnetic valves 191, 192, 193 may be arranged downstream of the exchangers 51, 52, 53 in the refrigerant flow. In short, it is only necessary that the circulation of the refrigerant to the indoor heat exchangers 51, 52, 53 can be cut off.

The air conditioner is not limited to the above-described heat pump type air conditioner, but may be an air conditioner in which the indoor heat exchangers 51, 52 and 53 perform only indoor cooling. Further, in the above embodiment, three indoor heat exchangers 51, 52, and 53 serving as evaporators are used. However, two or four or more indoor heat exchangers may be used. Further, the drive source of the compressor of the heat pump device according to the present invention is not limited to a water-cooled engine as in the above-described embodiment, but is, for example, a drive source for an electric motor, an air-cooled engine, or the like. The above-described effect of improving the heating capacity can be obtained even when the refrigerant is heated by the exhaust heat.

In addition, the heating expansion valve and the cooling expansion valve in each of the above embodiments may be replaced with, for example, a well-known mechanically controlled expansion valve and a fixed throttle such as a capillary tube. . Further, the application of the heat pump device of the present invention is not limited to indoor air conditioning (cooling or heating), and can be used as a cold storage. When used as a cold storage, the heating operation in the present invention means a heating operation, and the cooling operation means a cooling operation.

[Brief description of the drawings]

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

FIG. 2A is a cross-sectional view showing an assembled state of an indoor unit according to an embodiment of the present invention in a room, and FIG. 2B is a bottom view of FIG.

FIG. 3 is an electric block diagram related to operation control of the air conditioner according to the embodiment of the present invention.

FIG. 4 is an electric block diagram illustrating operation control of a solenoid valve, a blower fan, and a louver when cooling of the refrigerator according to the embodiment of the present invention is stopped.

FIG. 5 is a time chart illustrating the operation of a solenoid valve and a blower fan when cooling of the refrigerator according to the embodiment of the present invention is stopped.

6A is a graph showing a temperature change of a refrigerator to which the present invention is applied, and FIG. 6B is a graph showing a temperature change of a refrigerator of a comparative example.

[Explanation of symbols]

2: Compressor, 9: Outdoor heat exchanger (condenser), 61, 6
2, 63 ... cooling expansion valve (expansion valve), 51, 52, 53
... indoor heat exchanger (evaporator), 151, 152, 153 ...
Indoor fans (blower means), 191, 192, 193: solenoid valves (valve means), 71: air conditioning case, 72: air inlet, 73: air outlet.

Claims (5)

[Claims] A compressor for compressing and discharging a refrigerant (2)
A condenser (9) for condensing the gas refrigerant discharged from the compressor (2); a first expansion valve (61) for decompressing and expanding the liquid refrigerant condensed in the condenser (9); A second expansion valve (62) provided in parallel with the first expansion valve (61) and configured to decompress and expand the liquid refrigerant condensed in the condenser (9); and a refrigerant decompressed and expanded by the first expansion valve (61). And a second evaporator (52) provided in parallel with the first evaporator (51) and evaporating the refrigerant decompressed and expanded by the second expansion valve (62). A first and a second air-conditioning case (71), each of which incorporates the first and second evaporators (51, 52) and includes an air inlet (72) and an air outlet (73); (71) Cooled from the air inlet (72) to the air outlet (73). First and second air blowing means (151, 152) for blowing air in a space; and the first and second air blowers are provided upstream or downstream of a refrigerant flow of the first and second evaporators (51, 52). 2 evaporators (5
First and second valve means (191, 192) for interrupting the flow of the refrigerant to the first and second evaporators (51, 52) when the first and second evaporators (51, 52) perform cooling. The two-valve means (191, 192) are opened and the first and second air blowing means (151, 152) are opened.
When the cooling by the first and second evaporators (51, 52) is stopped, the first and second valve means (19) are operated.
1, 192), and the first and second blowing means (151, 152) are stopped. The first evaporator (51) cools the air and the second air blower.
When cooling by the evaporator (52) is stopped, the second valve means (192) is opened for a very short time (T2) every predetermined time (T1), and the second valve means (19) is opened.
An air conditioner characterized by activating the second blowing means (152) when the valve is opened in (2). 2. A first and second instructing means (1) for instructing the first and second evaporators (51, 52) to stop cooling operation.
01, 102), and the predetermined time (T1) has elapsed since the operation of cooling by the first evaporator (51) was instructed and the stop of cooling by the second evaporator (52) was instructed. When
First control means (C, G) for opening the second valve means (192) for the short time (T2); and opening the second air blowing means (152) when the second valve means (192) is opened. The air conditioner according to claim 1, further comprising a second control unit (D, H) that operates. 3. The first and second blowing means (151, 15).
The air blowing amount of 2) can be switched to at least two stages of a low air blowing amount and a high air blowing amount. When the second valve means (192) is opened for the very short time (T2), The air volume of the second air blowing means (152) is set to a low air volume.
An air conditioner according to claim 1. 4. The air outlet (73) of the air conditioning case (71) is provided with a wind direction adjusting member (74) for adjusting the direction of air blown from the air outlet (73). The air-conditioning case (71) includes a ceiling portion (7) of a space to be cooled.
When the second valve means (192) is opened for the minute time (T2), air is supplied from the air outlet (73) along the ceiling (7). The air conditioner according to any one of claims 1 to 3, wherein the air is blown out. 5. Reversing the refrigerant flow in the air conditioner according to any one of claims 1 to 4,
The condenser (9) acts as an evaporator,
A heat pump type air conditioner in which the first and second evaporators (51, 52) function as condensers.