JPH0425455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a heat pump type air-conditioning system, and particularly relates to an improvement in a system having two sets of refrigerant circulation systems each equipped with a compressor.

(Prior Art) Generally, in a heat pump air-conditioning system having two sets of refrigerant circulation systems of this type, during cooling operation, the compressor of one refrigerant circulation system is operated preferentially, and the cooling capacity is adjusted according to the room temperature. On the other hand, during heating operation, the compressor of the other refrigerant circulation system is operated preferentially, and the heating capacity is controlled in size according to the room temperature, so that the compressors of both refrigerant circulation systems can be operated throughout the year. The times are made almost equal to each other in order to improve the durability and reliability of the compressor.

By the way, when defrosting the frost that has grown on the heat source side heat exchanger of each refrigerant circulation system during heating operation in the above-mentioned heat pump air conditioning system, the frost on both heat source side heat exchangers is compared to each other's frost amount. For example, in the method disclosed in Japanese Unexamined Utility Model Publication No. 50-5958, due to the need to ensure completion of both processes regardless of their differences,
Two frost detection signals for detecting frost formation on the heat source side heat exchanger of each refrigerant circulation system, and two defrost completion detection means for respectively detecting the completion of the defrost are provided, and either one of the frost detection means is provided. When a frost detection signal is generated, the defrost operation of the heat source side heat exchangers of both refrigerant circulation systems is started all at once, and thereafter, when a defrost completion signal is generated in either of the defrost completion detection means, the corresponding refrigerant circulation is started. By stopping the operation of the compressor in the system and waiting until defrost is completed for other refrigerant circulation systems with a large amount of frost, defrost for both heat source side heat exchangers is surely completed. It is done like this.

(Problem to be Solved by the Invention) However, when a heat pump type air-conditioning system as described above is equipped with a function to inhibit the restart of the compressor, in other words, in order to protect the refrigerant circulation system, once the compressor is stopped, If the restart of the compressor is prohibited for a predetermined period of time, due to the priority order of the compressors, the warm-up operation may not be restarted immediately even though there is a request for heating after the defrost operation is completed. In other words, when defrosting for each refrigerant circulation system is completed in the order of priority side → non-priority side,
If the interval between the completion of defrosting on both of them is within the compressor restart prohibition time, the non-priority compressor will stop, and then the priority side compressor will be compressed only after waiting for the priority side restart prohibition time to elapse. Since the machine is restarted and the heating operation is resumed, the heating operation is not performed during the waiting time for the restart prohibition time to elapse, and comfortable air conditioning cannot be ensured. Moreover, since the operation of the compressor on the non-priority side is stopped, the annual energy consumption efficiency (SEER) is reduced.

The present invention has been made in view of the above, and an object of the present invention is that in the heat pump type air-conditioning system as described above, when defrosting of both heat source side heat exchangers is completed, the refrigerant circulation system of the side that will be completed later is By forcing the compressor to operate continuously regardless of its priority, heating operation is resumed immediately after defrosting operation is completed, ensuring comfortable air conditioning and improving SEER.

(Means for Solving the Problems) As shown in FIG. 1, the solving means of the present invention includes the above-described heat pump type air-conditioning system, that is, first and second refrigerant circulation systems A and B, During cooling operation, the compressor 1 of the first refrigerant circulation system A is preferentially operated, while during heating operation, the compressor 2 of the second refrigerant circulation system B is preferentially operated, and each refrigerant circulation system A is operated preferentially. , B, respectively, and the defrosting of the heat source side heat exchangers ₁₁ , 11 _' of each refrigerant circulation system A, B is completed. defrost completion detection means 26, 26' for respectively detecting the
Upon receiving the frost detection signal from either DM ₁ or DM ₂ , the heat source side heat exchanger 1 of both refrigerant circulation systems A and B
1 and 11', and when a defrost completion signal is received from either of the defrost completion detection means 26, 26', the operation of the compressor of the corresponding refrigerant circulation system is stopped and the system waits. , a defrost operation control means 52 which completes the defrost operation when receiving both defrost completion signals.
and a restart inhibiting means 53 for inhibiting the restart of the compressors 1 and 2 of each of the refrigerant circulation systems A and B for a predetermined time _t4 , and the above-mentioned when transitioning from defrost operation to heating operation. Compressor 2 of second refrigerant circulation system B based on restart prohibition means 53
The configuration includes a compensating means 54 that causes the compressor 1 of the first refrigerant circulation system A to operate continuously when restarting the refrigerant circulation system A is prohibited.

(Function) In the present invention, when defrosting for each refrigerant circulation system is completed in the order of non-priority side → priority side, the compressor on the priority side is operated continuously, and conversely, the order of defrost is changed from priority side → non-priority side. When the defrost is completed, the non-priority compressor is forced to operate continuously, so that the heating operation is immediately resumed in any case when the defrost is completed.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings from FIG. 2 onwards.

FIG. 2 shows an embodiment applied to an air-cooled heat pump type chiller, and A is a first compressor having a first compressor 1.
B is a second refrigerant circulation system having a second compressor 2, and 3 is a refrigerant circulation system for both A and B.
The water side heat exchanger 3 is connected to an indoor heat exchanger (not shown) disposed indoors via cold and hot water pipes 4a and 4b. During indoor cooling, the amount of heat absorbed from indoor air to cold water by the indoor heat exchanger is radiated to the refrigerants in both refrigerant circulation systems A and B by the water-side heat exchanger 3.
While cooling the room, during room heating, the amount of heat given from the refrigerant to cold water by the water-side heat exchanger 3 is radiated to the indoor air by the indoor heat exchanger, thereby warming the room.

The above two refrigerant circulation systems A and B have the same configuration, and below, the first refrigerant circulation system A will be explained (the second refrigerant circulation system B will be described with the same reference numerals followed by "'"). (The explanation is omitted.) The first refrigerant circulation system A has a four-way switching valve 1 therein.
0, an air side heat exchanger 11 as a heat source side heat exchanger having a blower fan 11a, a liquid receiver 12, a cooling expansion valve 13a and two heating expansion valves 13b.
Each of the devices 10 to 13 and the water side heat exchanger 3 are connected to each other through refrigerant piping 14 so that the refrigerant can be circulated to form a closed circuit 15, and during indoor cooling and defrost operation, a four-way circuit is formed. By switching the switching valve 10 as shown by the solid line in the figure and circulating the refrigerant as shown by the solid line arrow in the figure, the amount of heat radiated from the hot water to the refrigerant in the water side heat exchanger 3 is radiated to the outside air in the air side heat exchanger 11. While cooling the hot water and defrosting the air side heat exchanger 11,
During indoor heating, the four-way selector valve 10 is switched as shown by the broken line arrow in the figure to circulate the refrigerant as shown in the broken line in the figure. It is designed to radiate heat and heat cold water.

Further, 20 and 21 are refrigerant pipes 22 and 2, respectively.
A three-way solenoid valve for capacity control is connected to the discharge side of the first compressor 1 through a three-way solenoid valve 20, 21, and when the three-way solenoid valves 20 and 21 are turned off, they are switched as shown by the solid line in the figure. The refrigerant discharged from the compressor 1 is returned to the discharge side of the compressor 1 via the refrigerant pipe 24, while when ON is activated, the switch is switched as shown by the broken line in the figure, and the refrigerant from the compressor 1 is returned to the discharge side of the compressor 1 via the refrigerant pipe 25. When only one three-way solenoid valve 20 is turned ON, the capacity of the compressor 1 is reduced to 50%, while both three-way solenoid valves 20, 21 The compressor 1 capacity is reduced to 25% when the compressor 1 is turned on. In addition, in the figure, 26 is a high-pressure pressure switch for defrost as a defrost completion detection means that closes when the high-pressure refrigerant to the air side heat exchanger 11 exceeds a predetermined pressure during defrost operation and outputs a defrost completion signal. be.

Next, FIG. 3 shows the internal configuration of an operation control circuit 30 that controls the operation of the chiller shown in FIG. 2 above. In the same figure, MC1 is the first compressor electric motor, MC2
MF1 is the electric motor for the second compressor, MF1 is the electric motor for the blower fan of the first air side heat exchanger 11, and MF2 is the electric motor for the blower fan of the second air side heat exchanger 11'. In addition, BS1 is a stop push button, BS2 is a run push button, SS2 is a cold/warm selector switch, and X1
is a stop relay that turns ON when the above stop pushbutton BS1 is closed, and X2 is a stop relay that is activated when the operation pushbutton BS2 is closed.
The operating relay X3 that is activated is a heating relay that is activated when the cooling/heating changeover switch SS2 is switched to the heating side. Furthermore, 6C ₁ is a relay having a normally open contact 6C _1-1 for Y-connecting the first compressor motor MC1, and 52C ₁ is a relay for connecting the first compressor motor MC1 to a Y-connection.
42C ₁ is a relay having a normally open contact 52C _{1-1 that} controls power supply to the first compressor motor MC1,
Further, 6C ₂ , 52C ₂ , 42C ₂ are normally open contacts 6C _2-1 , 52 for Y connection, power supply control and Δ connection for the second compressor motor MC2, respectively, in the same manner as above.
This is a relay having C _2-1 and 42C _2-1 . In addition,
52F ₁ is a first contact point 52F 1-1 having a normally open contact 52F _1-1 for controlling power supply to the first blower fan motor MF1.
The blower fan relay 52F ₂ is a second blower fan relay having a normally open contact 52F _2-1 that similarly controls the power supply to the second blower fan motor MF ₂ .

Further, Th is a temperature sensor consisting of a thermistor that detects the indoor temperature, VR1 is a variable resistor for setting the room temperature during cooling operation, VR2 is a variable resistor for setting the room temperature during heating operation, and 30 is the temperature sensor mentioned above.
This is a temperature regulator that receives signals from Th and variable resistors VR1 and VR2 and outputs a signal indicating the temperature deviation between the actual room temperature and the set room temperature. Furthermore, 31 is
The controller 31 is equipped with a CPU, and the input side of the controller 31 receives a warming return signal caused by the closing of the normally open contact _X3-1 of the heating relay X3 and the closing of the normally open contact X1-1 of the stop relay _X1 . stop command signal due to the configuration and normally open contact _X3-1 of operation relay
The operation command signal by closing the temperature regulator 3
A temperature deviation signal from 0, a defrost command signal by closing the normally open contact DMX _-1 of the defrost relay DMX, which will be described later, and each defrost by closing the first and second high-pressure pressure switches 26 and 26'. A completion signal is input to each of them, and the first compressor electric motor is connected to the output side of the completion signal.
Three relays 6C ₁ , 52 that control the operation of MC1
C ₁ , 42C ₁ , the unloading three-way solenoid valves 20, 21 and the ON/OFF solenoid valve RS1 of the first compressor 1, and the second compressor electric motor MC2.
Three relays 6C ₂ , 52C ₂ , 4 control the operation of
2C ₂ , three-way solenoid valves 20' and 21' for unloading the second compressor 2, and solenoid valves for ON/OFF.
RS1' and the first and second blower fan relays 5
2F ₁ , 52F ₂ and two four-way switching valves 10, 1
0' and defrost relays DMX connected in series to de-icers DM ₁ and DM ₂ as first and second defrost detection means, respectively.

Next, the operation of the controller 31 will be explained based on the flow charts shown in FIGS. 4 to 7 (S ₁ to _{S 66} indicate step numbers). First of all,
In Fig. 4, the operation starts with the reception of an operation command signal, and in _S1, it is determined whether or not there is a cooling request based on the presence or absence of a heating signal.
In the case of YES, the first and second blower fans 11a, 11'a are operated in _S2 , the first compressor 1 is preferentially started in _S3 , and then the predetermined time _t1 is started in _S4 . (For example, after 5 seconds have elapsed, the second compressor 2 is started in _S5 . From then on, based on the cooling operation subroutine shown in FIG. 5, the first compressor 1 is preferentially operated while the Performs cooling operation at a capacity corresponding to the amount.

On the other hand, when a heating request is made with a heating signal in _S1 above,
In the case of NO, the first and second blower fans 11a and 11'a are similarly operated in _S6 , and the four-way switching valves 10 and 10' are switched as shown by the broken line arrow to establish a heating circuit, and in _S7 Then, after starting the second compressor 2 preferentially, the predetermined time _{t 1 (} for example, 5
After waiting for the elapse of 2 seconds), the first compressor 1 is then activated in _S9 , and thereafter, the second compressor 2 is operated preferentially based on the heating operation subroutine shown in FIG. 6, depending on the room temperature. Perform capacity heating operation.

Next, to explain the cooling operation subroutine of FIG. 5, in _S10 , the magnitude relationship between the actual room temperature T ₀ and the set room temperature Ts is determined based on the temperature deviation signal from the temperature regulator 30, and it is determined that Ts<T ₀ . If YES, it is determined that the capacity is insufficient, and after waiting for a predetermined time t ₂ (for example, 3 minutes) to elapse in _S11 , the first compressor 1 and the second compressor 2 are turned on in _S12 . The capacities C ₁ and C ₂ are compared in size, and if C ₁ = C ₂ is YES, the capacity of the first compressor 1 is further determined in S ₁₃ , and C ₁ = 100% YES.
In this case, it is determined that both are at the maximum capacity, and the operation continues in _S14 and returns to _S10 . On the other hand, in the case of NO (C≠100%), in _S15 the first (priority side) ) Increase the capacity of compressor 1 by one step preferentially.
Return to _S10 .

On the other hand, if C ₁ ≠ C ₂ NO in S ₁₂ , then C ₁ in S ₁₆
＞C ₂ or not, and if C ₁ <C ₂ is NO, then
Return to S ₁₀ , while if C ₁ > C ₂ is YES, further
In _S17 , it is determined whether _{C 2} = 100% or not.
If YES, return to S ₁₄ , continue operation and return to S ₁₀ , while if C ₂ ≠ 100% NO
In _S18 , the capacity of the second compressor 2 is increased by one stage and the process returns to _S10 .

In addition, if Ts≧To is NO in _S10 , it is determined that the state is supercooled, and in _S19 , the predetermined time _t3 (for example, 45
Wait until the time has elapsed (seconds), then compare the capacities of compressors 1 and 2 in S ₂₀ , and if C ₁ = C ₂ is YES, further determine the capacity of the first compressor 1 in S ₂₁ . , C ₁ =
If YES is 0%, it is determined that both are at the minimum capacity, and operation continues (stops) at S ₂₂ .
Then, in S ₂₃ , wait for the restart prohibition time t ₄ (for example, 10 minutes) to elapse and return to S _10. On the other hand, if C ₁ ≠ 0 (NO), restart the second (non-priority side) in S ₂₄ . By lowering the capacity C ₂ of compressor 2 by one stage, the first compressor 1
Return to S ₁₀ by reducing cooling capacity while giving priority to

On the other hand, if C ₁ ≠ C ₂ NO in S ₂₀ , then
In S ₂₅ , it is determined whether C ₂ < C ₁ or not. If C ₂ > C ₁ is NO, the process returns to S 10, while if C ₂ < C ₁ is YES, the process returns to S ₁₀ .
In _S26 , the capacity of the first compressor 1 is lowered by one stage and the process returns to _S10 .

Next, to explain the heating operation subroutine of FIG. 6, in _S27 , the magnitude relationship between the actual room temperature To and the set room temperature Ts is determined based on the temperature deviation signal from the temperature regulator 30, and if Ts>To is YES. In this case, it is determined that the capacity is insufficient, and after waiting for a predetermined time t ₂ (for example, 3 minutes) to elapse in S ₂₈ , the capacity C of the first compressor 1 and the second compressor 2 is determined in S ₂₉ . ₁ and C ₂ are compared, and if C ₁ = C ₂ is YES, the capacity of the second compressor 2 is further determined in S ₃₀ , and C ₂ = 100% YES.
In this case, it is determined that both are in the maximum capacity state, and the operation continues in S ₃₁ and returns to S _27. On the other hand, in the case of NO (C ₂ ≠ 100%), the second (priority) is selected in S ₃₂ . The capacity C ₂ of the compressor 2 (on the side) is raised by one step and the process returns to S ₂₇ .

On the other hand, if C ₁ ≠ C ₂ NO in S ₂₉ , then C ₁ in S ₃₃
Determine whether <C ₂ or not, and if C ₁ >C ₂ is NO, then
Return to S ₂₇ , while if C ₁ < C ₂ is YES, further
In S ₃₄ , it is determined whether _{C 1} = 100% or not.
If YES, return to S ₃₁ , continue operation and return to S ₂₇ , while if C ₁ ≠ 100% NO
At _S35 , the capacity C1 of the first (non-priority side) compressor ₁ is increased by one step, and the process returns to _S27 .

Also, if Ts≦To is NO in _S27 , it is determined that the overheating state is present, and the process is continued in _S36 for a predetermined period of time _t3 (for example, 45
Wait until the second compressor 2 has elapsed, then compare the capacities of compressors 1 and 2 in S ₃₇ , and if C ₁ = C ₂ is YES, further determine the capacity of the second compressor 2 in S ₃₈ . , C ₂ =
If YES is 0%, it is determined that both are at the minimum capacity, and operation continues (stops) at S ₃₉ .
Then, in S ₄₀ , wait for the maximum startup prohibition time t ₄ (for example, 10 minutes) to elapse and return to S _27. On the other hand, if C ₂ ≠ 0 (NO), in S ₄₁ , the first (non-priority side) ) By lowering the capacity of the compressor 1 by one stage, the heating capacity is reduced while giving priority to the first (priority side) compressor 1, and the process returns to _S27 .

On the other hand, if C ₁ ≠ C ₂ NO in S ₃₇ , then
In S ₄₂ , it is determined whether C ₂ > C ₁ , and if C ₂ < C ₁ is NO, the process returns to S 27, while if C ₂ > C ₁ is YES, the process returns to S ₂₇ .
In _S43 , the capacity of the second (priority side) compressor 2 is lowered by one stage and the process returns to _S27 .

When the first or second de-airser DM ₁ or DM ₂ operates during the heating operation, the defrost operation control flow shown in FIG. 7 is proceeded to and the defrost operation is started based on the reception of the defrost command signal.

That is, in _S50 , first the four-way switching valve 10,
10' as shown by the solid line to set the refrigerant circulation system to a defrost operation circuit and stop the blower fans 11a, 11a' of both air side heat exchangers 11, 11a, and then switch the first and second compressors at _S51. 1,2
By operating the refrigerant at 50% capacity, the heat of the refrigerant is radiated to the air-side heat exchangers 11 and 11', thereby defrosting the frost that has grown thereon.

After that, in _S52 , it is determined whether the first defrost high-pressure switch 26 is closed, that is, whether the first defrost completion signal has been generated or not.If NO, the process is continued in _S53 . The presence or absence of the second defrost completion signal based on the closing of the second defrost high-pressure switch 26' is determined, and if NO is generated, the first and second air-side heat exchangers 11, 11 are It is determined that the defrost for both ′ has not been completed yet, and the process returns to _S52 .

Then, in the case of YES when the first defrost completion signal is received in _S52 , it is determined that the defrost operation for the first air-side heat exchanger 11 is completed first, and the first compressor is restarted in _S54 . Stop the operation of 1 and complete its defrost,
Start counting timer _t4 at _S55 . after that,
Determine the presence or absence of the second defrost completion signal in _S56 ,
If NO is not received, it is determined that the defrost operation is continuing for the second air-side heat exchanger 11', and the system waits. When the second defrost completion signal is received, both heat source-side heat exchangers 11' 11,1
Determining that the defrost for 1' is complete, S ₅₇
Then, the four-way switching valves 10 and 10' are switched as shown by the broken lines to return the refrigerant circulation system to the heating circuit.

After that, in _S58 , timer _t4 determines whether the restart prohibition time (for example, 10 minutes) has elapsed;
If t ₄ <10 (NO), the second compressor 2 is operated continuously at S ₅₉ to perform heating operation at 25% capacity, while if t ₄ ≧10 (YES), the restart prohibition time is 10. Judging that the minutes have already passed, the first compressor 1 is restarted at S ₆₀ , and the two compressors 1 and 2 are activated.
Perform heating operation at 50% capacity and return to S ₂₇ in Figure 6.

On the other hand, in the case of YES in _S53 where the second defrost completion signal is received first, it is determined that the defrost operation for the second air side heat exchanger 11' has been completed first, and the second defrost completion signal is received in _S61 . The operation of the compressor 2 of No. 2 is stopped to complete its defrosting, and at the same time, the timer _t4 starts counting in _S62 . After that, in _S63 , it is determined whether or not there is a first defrost completion signal, and if NO has not been received yet, it is determined that the defrost operation for the first air-side heat exchanger 11 is continuing, and the process remains on standby. , upon receiving the first defrost completion signal, both heat source side heat exchangers 1
It is determined that defrosting for both 1 and 11' has been completed, and the refrigerant circulation system is switched to the heating circuit in _S64 .

After that, at S ₆₅ , timer t ₄ prohibits restarting for 10
Determine whether or not minutes have elapsed, and if t ₄ < 10 NO
In the case of S ₆₆ , the first (non-priority side) compressor 1
Continuously operate as it is regardless of the operation priority order.25
% capacity heating operation starts while t ₄ ≧10 YES
In this case, it is determined that the restart prohibition time has already elapsed, and the second compressor 2 is restarted in S ₆₇ to start heating operation at 50% capacity with the two compressors 1 and 2. Then return to _S27 in Figure 6.

Therefore, based on the processing operations of S ₅₀ and S ₅₁ , the air-side heat exchangers 11 and 11' of both refrigerant circulation systems A and B are defrosted upon receiving the frost signal from either of the de-icers _{DM 1 and} DM 2. Start driving,
After that, when a defrost completion signal is received in S ₅₂ or S ₅₃ , the operation of the compressor of the corresponding refrigerant circulation system is stopped and put on standby in S ₅₄ or S ₆₁ , and then, in S ₅₆ or
When the defrost completion signal from the other side is received in S ₆₃ and the defrost completion signals from both sides are aligned, the defrost operation control means 52 switches the refrigerant circuit to the heating circuit in S ₅₇ or S ₅₆ to complete the defrost operation. It consists of Also, in Figure 5 above
_{The compressor 1 , _}
If the defrost for the second refrigerant circulation system B is completed first in _S53 , then in _S65 the restart of the compressor is prohibited. Restart prohibition time
When within t ₄ , the first ( _non -preferred)
Compensation means 54 is configured to allow the compressor 1 to operate continuously regardless of the operating priority.

Therefore, in the above embodiment, during defrost operation, if the amount of frost formed on the air-side heat converter 11 of the first refrigerant circulation system A is smaller than that of the other, the second refrigerant circulation system B air side heat exchanger 1
Defrosting for 1' will be completed later, but at this time, the second (priority side) compressor 2 will continue to operate as before ( _S59 in Figure 7), so heating will start immediately. Operation will resume and comfortable air conditioning will be ensured.

Conversely, if the amount of frost formed on the air side heat exchanger 11' of the second refrigerant circulation system B is smaller than that on the other side,
Defrosting of the air side heat exchanger 11 of the first refrigerant circulation system A will be completed later, but at this time, the restart prohibition time of the second (priority side) compressor 2 is t ₄ (10 minutes). Inside both air side heat exchangers 11,1
Even when the defrost for 1' is completed, the first (non-priority side) compressor 1 is forcibly operated continuously by the compensating means 54 regardless of the state in which the restart of the second compressor 2 is prohibited. (S ₆₆ in FIG. 7), the heating operation is immediately resumed, ensuring comfortable air conditioning. Moreover, SEER is improved by continuous operation of the first (non-priority side) compressor 1.

In the above embodiment, two sets of refrigerant circulation systems A,
Although the case has been described in which the present invention is applied to a heating and cooling system having only B, the present invention is not limited thereto. The present invention may be applied to such cases.

(Effects of the Invention) As explained above, according to the heat pump type air-conditioning system of the present invention, among the compressors provided in the two sets of refrigerant circulation systems, the one that is on the non-priority side during the heating operation finishes the defrost operation. In some cases, the compressor on the priority side is forced to operate continuously regardless of the restart prohibition state, so heating operation can be resumed immediately after defrosting operation is completed, ensuring comfortable air conditioning. It is possible to improve the annual energy consumption efficiency by reducing the frequency of starting and stopping the compressor.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention.
Figures 2 to 7 show embodiments of the present invention, Figure 2 is a refrigerant piping system diagram, Figure 3 is an electric circuit diagram showing the internal configuration of the operation control circuit, and Figures 4 to 7 are respectively FIG. 3 is a flowchart showing the operation of the controller. A...first refrigerant circulation system, B...second refrigerant circulation system, 1...first compressor, 2...second compressor, 1
1, 11'...Air side heat exchanger (heat source side heat exchanger),
DM ₁ , DM ₂ ... Day mercury (frost detection means),
26, 26'...High pressure switch for defrost (defrost completion detection means), 52...Defrost operation control means, 53...Restart prohibition means, 54...Compensation means.

Claims (1)

[Claims] 1 has first and second refrigerant circulation systems A and B, and during cooling operation, the compressor 1 of the first refrigerant circulation system A is operated preferentially, while during heating operation, the compressor 1 of the second refrigerant circulation system B is activated. In a heat pump type air-conditioning system in which the compressor 2 is operated preferentially, frost detection means DM ₁ and DM are provided to detect frost formation on the heat source side heat exchangers 11 and 11' of each of the refrigerant circulation systems A and B, respectively. ₂ , defrost completion detection means 26 and 26' for detecting the completion of defrosting of the heat source side heat exchangers 11 and 11' of each of the refrigerant circulation systems A and B, and both of the above-mentioned frost detection means.
Upon receiving the frost detection signal from either DM ₁ or DM ₂ , the heat source side heat exchanger 1 of both refrigerant circulation systems A and B
1 and 11', and when a defrost completion signal is received from either of the defrost completion detection means 26, 26', the operation of the compressor of the corresponding refrigerant circulation system is stopped and the system waits. , a defrost operation control means 52 which completes the defrost operation when receiving both defrost completion signals.
, a restart inhibiting means 53 for inhibiting the restart of the compressors 1 and 2 of each of the refrigerant circulation systems A and B for a predetermined time _t4 , and the restart inhibiting means at the time of transition from defrost operation to heating operation. 53, when restarting the compressor 2 of the second refrigerant circulation system B is prohibited, the compressor 1 of the first refrigerant circulation system A
A heat pump type air-conditioning device characterized by comprising a compensating means 54 for continuously operating the heat pump type air-conditioning device.