JPH07101130B2 - Operation control device for air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an operation control device for an air conditioner, and in particular,
This is a measure for controlling the startup of the compressor.

(Prior Art) Conventionally, in an air conditioner, a bypass circuit for guiding a refrigerant from a discharge side to a suction side of the compressor is provided in a refrigerant circuit formed by sequentially connecting a compressor, a condenser, an expansion valve, and an evaporator. In some cases, the bypass passage is made conductive when the compressor is stopped to equalize the pressure in the refrigerant circuit to improve the pressure balance.

(Problems to be Solved by the Invention) In the above-mentioned air conditioner, the refrigerant circuit is pressure-equalized to prevent overload of the compressor at the time of starting the compressor,
Compensation for starting the compressor. In particular, if a momentary power failure occurs during driving of the compressor, a high-low pressure difference occurs in the refrigerant circuit, and therefore it is necessary to compensate the start of the compressor. And
In the case where the compressor is controlled by an inverter, this momentary power failure is detected by discharging a capacitor provided in the inverter.

However, when the compressor is not controlled by an inverter or when it is switched to a commercial power source, there is a problem that the instantaneous power failure cannot be detected and the start compensation of the compressor cannot be accurately performed. Further, in the above-mentioned non-inverter control or the like, if an attempt is made to detect an instantaneous power failure, a separate backup circuit is required, and the number of parts is increased.

Furthermore, it is conceivable to perform compensating for the start of the compressor when the power is turned on, including the momentary power failure, but this means that the standby operation is performed even when the pressure in the refrigerant circuit is equalized.
There is a problem that the air conditioning operation is delayed and the comfort is poor.

The present invention has been made in view of such a point, and detects an instantaneous power failure by using a status signal of a pressure detection unit or the like for controlling the refrigerant in a refrigerant circuit, and can accurately perform startup compensation of a compressor. On the other hand, it is an object of the present invention to improve the control accuracy by making it possible to determine the abnormality of the pressure detecting means.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the means taken by the invention according to claim (1) is, as shown in FIG. 1 (a), first, a compressor (1), An intermediary circuit (14) is provided in which the heat source side heat exchanger (6), the expansion mechanism (13) and the utilization side heat exchanger (12) are sequentially connected by a refrigerant pipe (11). Then, drive control means (1 for controlling the drive of the compressor (1)
5), the power-on detection means (15b) for detecting the power-on of the drive control means (15), and the compressor (1) are made to stand by for a predetermined time during which the refrigerant circuit (14) equalizes the pressure. Thus, the standby means (15c) for controlling the drive control means (15) is provided. Furthermore, the refrigerant circuit (1
The pressure detection means (HPS) that operates when the refrigerant pressure in 4) reaches a predetermined value and the operation detection means (15d) that detects whether or not the pressure detection means (HPS) is in an operating state are provided. . In addition, when the pressure detection means (HPS) is in the operating state when the power is turned on in response to the output signals of the power-on detection means (15b) and the operation detection means (15d), the standby means (15
A standby operation means (15e) for operating c) is provided. Further, in the invention of claim (1), the means taken by the invention of claim (2) is the operation detecting means (15d) instead of the power-on detecting means (15b) and the standby operation detecting means (15e). ) Output signal, the abnormality determining means (15f) is provided for determining the abnormality of the pressure detecting means (HPS) when the pressure detecting means (HPS) is in the operating state at the end of the standby operation of the standby means (15c). According to the invention as defined in claim (3), the invention of claim (1) includes the abnormality determining means (15f) of claim (2). The means taken by the invention according to claim (4) is, as shown in FIG. 1 (b), a pressure detecting means (HPS), an operation detecting means (15d) and a standby state in the invention of claim (1). Instead of the operating means (15e), a saturation detection temperature detecting means (15g) for detecting the pressure equivalent saturation temperature of the refrigerant in the refrigerant circuit (14), an outside air temperature detecting means (TH8) for detecting the outside air temperature, and Differential temperature detecting means (15g) for receiving the output signals of the saturation temperature detecting means (15g) and the outside air temperature detecting means (TH8) and detecting the temperature difference between the pressure equivalent saturation temperature and the outside air temperature.
h) and the output signals of the power-on detecting means (15b) and the differential temperature detecting means (15h), the standby means (15c) is activated if the differential temperature at power-on exceeds a predetermined value. The invention comprises the standby operation means (15j), and the means devised by the invention according to claim (5) is a high pressure measuring means (P2) for measuring the high pressure of the refrigerant in the refrigerant circuit (14). A low pressure measuring means (P3) for measuring the low pressure of the refrigerant in the refrigerant circuit (14), and the high pressure measuring means (P3)
2) and differential pressure detecting means (15i) for detecting the differential pressure between the high pressure and the low pressure by receiving the output signal of the low pressure measuring means (P3)
And standby actuation means for actuating the standby means (15c) when the differential pressure exceeds a predetermined value when the power is turned on in response to the output signals of the power-on detection means (15b) and the differential pressure detection means (15i). (15j) and the configuration.

(Operation) With the above configuration, in the inventions according to claims (1) and (3), the drive control means (15) drives and controls the compressor (1),
While the refrigerant circulates in the refrigerant circuit (14) to perform the air conditioning operation, the pressure detection means (HPS) detects whether or not the refrigerant pressure has reached a predetermined value. For example, the discharge of the compressor (1). It is detected whether or not the high pressure on the side has reached a predetermined value, and when the pressure becomes abnormally high, the drive control means (15) is stopped.

In this air conditioning control, when the power is turned on, including the momentary power failure, the power-on detection means (15b) detects this power-on, while the operation detection means (15d) operates the pressure detection means (HPS). If the pressure detection means (HPS) is in the operating state when the power is turned on, it is determined whether an instantaneous power failure has occurred, and the standby operation means (15e) is set to the standby means (15e).
c) is operated to make the drive of the compressor (1) stand by to equalize the pressure of the refrigerant circuit (14), and then the drive control means (15) drives the compressor (1).

In the inventions according to claims (2) and (3), the operation detecting means (15d) at the end of the standby operation by the standby means (15c).
Detects the operation of the pressure detecting means (HPS), since it is originally in a state of not operating after pressure equalization, the abnormality determining means (15f) determines the abnormality of the pressure detecting means (HPS).

In the invention according to claim (4), the saturation temperature detecting means (15g) detects the pressure equivalent saturation temperature of the refrigerant, and the differential temperature detecting means (15h) detects the pressure equivalent saturation temperature and the outside air temperature detecting means. (TH8) detection The temperature difference from the outside temperature is detected. When the refrigerant circuit (14) is pressure-equalized, the pressure-equivalent saturation temperature becomes substantially equal to the outside air temperature at the detection site. Therefore, if the temperature difference is equal to or higher than a predetermined value when the power is turned on, an instantaneous power failure will occur. The standby operation means (15j) waits for the drive of the compressor (1).

Further, in the invention according to claim (5), the high pressure measuring means (P2) and the low pressure measuring means (P3) measure the high pressure and the low pressure of the refrigerant, instead of the pressure-equivalent saturation temperature of the claim (4). Then
The differential pressure detecting means (15i) detects the high and low differential pressure.
When the differential pressure is equal to or higher than a predetermined value when the power is turned on, it is determined whether an instantaneous power failure has occurred, and the drive of the compressor (1) is put on standby.

(Effect of the invention) Therefore, according to the inventions of claims (1) and (3) to (5), the instantaneous power failure is detected by using the status signal of the refrigerant controlling the refrigerant in the refrigerant circuit (14). Therefore, the instantaneous power failure can be accurately detected even when the compressor (1) is not inverter-controlled or switched to the commercial power source. As a result, the start-up compensation of the compressor (1) can be performed during the momentary power failure, and the control accuracy can be improved.

Further, since it is not necessary to provide a dedicated backup circuit for detecting an instantaneous power failure and the existing sensor signal or the like is used, it is possible to perform start-up compensation of the compressor (1) without increasing the number of parts. Furthermore, since the compressor (1) is in standby operation at the momentary stoppage that requires the pressure equalization of the refrigerant circuit (14), it is possible to quickly perform air conditioning operation without performing unnecessary standby operation. Can be improved.

Further, according to the inventions of claims (2) and (3), since it is possible to determine the abnormality of the pressure detection means (HPS), it is possible to perform accurate air conditioning control. In particular, the output signal of one pressure detecting means (HPS) causes the pressure detecting means (HPS) to
Can be detected, and the control accuracy can be improved without increasing the number of parts.

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

FIG. 2 shows a refrigerant piping system of a multi-type air conditioner according to an embodiment of the present invention, (A) is an outdoor unit, and (B)-
(F) is an indoor unit connected in parallel to the outdoor unit (A). Inside the outdoor unit (A),
The capacity is adjusted by the first compressor (1a) whose capacity is adjusted by the inverter (2a) that can variably switch the output frequency in the range of 30 to 70Hz in 10Hz steps, and the capacity by the unloader (2b) that differentiates depending on the pilot pressure. The second compressor (1 that is adjusted in two stages: full load (100%) and unload (50%)
b) is connected in parallel via a check valve (1e) to a variable capacity compressor (1), and the first and second compressors (1)
a), 1st and 2nd oil separators (4a) and (4b) for separating the oil in the gas discharged from (1b) respectively, and switching during cooling operation as shown by the solid line in the figure, and during heating operation in the figure A four-way switching valve (5) that switches as shown by the broken line, a condenser during cooling operation,
An outdoor heat exchanger (6), which is a heat source side heat exchanger that serves as an evaporator during heating operation, and two outdoor fans (6a) and (6b) attached to the outdoor heat exchanger (6), and a cooling operation An outdoor electric expansion valve (8) that sometimes regulates the flow rate of the refrigerant and performs a throttle action of the refrigerant during heating operation, a receiver (9) that stores the liquefied refrigerant, and an accumulator (10) are built in as main equipment. Each of the devices (1) to (10) is connected to a refrigerant pipe (11) so that the refrigerant can flow therethrough. The indoor units (B) to (F) have the same structure, and each is an indoor heat exchanger (12), which is a utilization side heat exchanger serving as an evaporator during cooling operation and a condenser during heating operation, and its fan. (12a) ... and the indoor heat exchanger (12)
The liquid refrigerant branch pipes (11a) of ... Are provided with indoor electric expansion valves (13), which are expansion mechanisms that adjust the flow rate of the refrigerant during heating operation and perform the throttle action of the refrigerant during cooling operation,
After merging, it is connected to the outdoor unit (A) by a refrigerant pipe (11b) via a manual shutoff valve (17). That is, each of the above devices is connected by a refrigerant pipe (11) so that the refrigerant can flow, and a refrigerant circuit (14) configured to release the heat obtained by heat exchange with the outdoor air to the indoor air is configured. Has been done.

Next, (11e) is a bypass path for heating overload control that connects the discharge pipe and the liquid pipe side so that the discharge gas (hot gas) can be bypassed. The auxiliary heat exchanger (22) installed in the air passage common to the exchanger (6), the capillary (28), and the solenoid on-off valve (24) that operates to open when the pressure of the refrigerant is high are sequentially connected in series and the outdoor heat exchanger ( 6) is connected in parallel, and when the cooling operation is always performed and the high pressure is excessively increased during the heating operation, the electromagnetic opening / closing valve (24) is turned on, that is, opened, so that a part of the discharge gas is discharged to the refrigerant circuit ( 14) to heating overload control bypass (11
I am trying to bypass e). At this time, a part of the discharge gas is condensed by the auxiliary heat exchanger (22) to assist the capacity of the outdoor heat exchanger (6), and also the capillary (28).
Therefore, the pressure loss on the outdoor heat exchanger (6) side is balanced.

Further, (11g) is a liquid for connecting the liquid refrigerant side pipe of the heating overload bypass passage (11e) and the suction line of the refrigerant circuit (14) to adjust the superheat degree of the suction gas during the heating and cooling operation. The injection bypass passage is provided with an injection solenoid valve (29) that opens and closes in conjunction with turning on and off of the compressor (1) and a capillary (30) in the bypass passage (11g). .

Further, (31) is the suction refrigerant and liquid pipe (1) in the suction pipe (11).
A suction pipe heat exchanger for cooling the suction refrigerant by heat exchange with the liquid refrigerant in 1) and compensating for an increase in the degree of superheat of the refrigerant in the communication pipe (11b).

Here, many sensors are arranged in this air conditioner. (TH1) ... are room temperature thermostats for detecting each room temperature, (TH2) ... and (TH3) ... are indoor heat exchangers (12). ) ... An indoor liquid temperature sensor and an indoor gas temperature sensor for detecting the temperature of the refrigerant in the liquid side and gas side pipes,
(TH4) is a discharge pipe sensor that detects the discharge pipe temperature of the compressor (1), (TH5) is a defrost sensor that detects the frosting state from the outlet temperature of the outdoor heat exchanger (6) during heating operation,
(TH6) is arranged in the suction pipe (11) on the downstream side of the suction pipe heat exchanger (31), and the suction pipe sensor detects the temperature of the suction pipe, and (TH7) is the air suction of the outdoor heat exchanger (6). An outside air temperature sensor located at the mouth to detect the intake air temperature, (P1) detects the decrease in the refrigerant pressure, that is, the saturation temperature Te corresponding to the evaporation pressure during cooling operation, and the high temperature, that is, the saturation temperature Tc corresponding to the condensation pressure during heating operation. Is a pressure sensor.

In addition to the above-mentioned main devices, various auxiliary devices are provided. (1f) is the bypass (11) of the second compressor (1b)
The unloader solenoid valve (1g), which is installed in (c) and becomes “open” when the second compressor (1b) is stopped and in the unload state and “closed” in the full load state, 11c) is a capillary, and (21) is a pressure equalizing hot gas bypass passage (11) that connects the discharge pipe and the suction pipe.
The pressure equalizing solenoid valves (33a) and (33b), which are installed in d) and open for a certain time before restarting after the compressor (1) is stopped due to a thermo-off state or the like, are capillaries (32
a), (32b) through the first and second oil separators (4a),
An oil return pipe for returning oil from (4b) to the first and second compressors (1a), (1b).

Further, in the figure, (HPS) is a high pressure switch for protecting the compressor, which is a pressure detecting means that becomes an open state when the high pressure of the refrigerant reaches a predetermined value, (SP) is a service port,
(GP) is a gauge port.

The solenoid valves and sensors are connected to the outdoor control unit (15), which will be described later, together with the main equipment by signal lines,
The outdoor control unit (15) is an indoor control unit (16)
It is connected to ... by a communication wire so that signals can be exchanged.

FIG. 3 is an electric circuit diagram showing the wiring relationship between the inside of the outdoor control unit (15) arranged on the side of the outdoor unit (A) and the connected devices. The outdoor control unit (15) is a compressor ( 1) and the like constitute drive control means for controlling the drive.

In the figure, (MC1) is the frequency conversion circuit (I
NV) motor of the first compressor (1a), (MC2)
Is the motor of the second compressor (1b), (52C ₁ ) and (52C ₂ )
Are electromagnetic contactors that operate the frequency conversion circuit (INV) and motor (MC ₂ ), respectively. The above devices are connected to the three-phase AC power supply (50) via the fuse box (FS) and the earth leakage breaker (BR1). Outdoor control unit (15)
It is connected to the control section of by a single-phase AC power source (50).
Also, (MF) is the fan motor of the outdoor fan (6a), (52)
F _H ) and (52F _L ) are electromagnetic contactors for operating the fan motor (MF), which are respectively connected in parallel to the single-phase component of the three-phase AC power source (50), and Outdoor fan (6a) when the device (52F _H ) is connected
Is switched to strong wind (standard air volume), and when the electromagnetic contactor (52F _L ) is connected, the outdoor fan (6a) can be selectively switched so that it becomes weak wind.

Next, inside the outdoor control unit (15), the normally open contacts (RY ₁ ) to (RY ₈ ) of the electromagnetic relay are connected in parallel to the single-phase AC current, and these are connected in order to the four-way connection. Switching valve (5)
Electromagnetic relay (20S), an electromagnetic contactor of the frequency converting circuit (INV) (52C _1), an electromagnetic contactor of the second compressor (1b) (52
C ₂ ), outdoor fan electromagnetic contactor (52F _H ), (52F _L ), hot gas solenoid valve (21) solenoid relay (SV _P ), injection solenoid valve (29) solenoid relay (SV _T ). And each sensor (TH1) that is connected in series to the coil of the electromagnetic relay (SV _L ) of the unloader solenoid valve (1f) and is input to the outdoor control unit (15) directly or via the indoor control unit (16). )-(TH7) signals are opened and closed to open and close the contacts of each electromagnetic contactor or electromagnetic relay. A coil of a pulse motor (EV ₁ ) for adjusting the opening of the outdoor electric expansion valve (8) is connected to the terminal CN. In the circuit on the right side of the figure, (CH ₁ ), (C
H ₂ ) are heaters for preventing oil forming of the first compressor (1a) and the second compressor (1c), respectively, which are connected in series with the electromagnetic contactors (52C ₁ ) and (52C ₂ ) respectively. Current flows in (1a) and (1b) when stopped. Furthermore, (51C ₁ ) is the overcurrent relay of the motor (MC ₁ ), (49C ₁ ) and (49C ₂ ) are the first compressor (1a),
Switch for temperature rise protection of the second compressor (1b), (63
H ₁ ), (63H ₂ ) are pressure rise protection switches for the first compressor (1a) and the second compressor (1b), and (51F) is an overcurrent relay for the fan motor (MF). Are connected in series to form a protection circuit that turns on the electromagnetic relay (30Fx) at startup and turns it off in case of failure. The outdoor control unit (15) includes a controller (15a) indicated by a broken line, and the controller (1
The operation of each device is controlled by 5a) in accordance with a signal input from each indoor control unit (16) ... Or each sensor.

Further, the controller (15a) has a feature of the present invention as a power-on detection for detecting all power-on such as power-on by the electromagnetic contactors (52C ₁ ) (52C ₂ ) and power-on by restoration from momentary power failure. When the means (15b) and the compressor (1) are started, the refrigerant circuit (14) is in a pressure equalizing state,
Specifically, the waiting means (15c) is configured to open the pressure equalizing solenoid valve (21) and wait the drive of the compressor (1) in a stopped state for a predetermined time (for example, 4 minutes) to perform start compensation. .

Further, the controller (15a), an operation detection means (15d) for detecting whether the high pressure switch (HPS) is in an operating state, that is, an open operating state or a closed non-operating state, When the high pressure switch (HPS) is in the operating state (open) when the power is turned on by receiving the output signals of the power-on detecting means (15b) and the operation detecting means (15d), the standby means (15c) is activated. Compressor (1)
And a standby actuation means (15c) for compensating the starting of the.

Further, the controller (15a) has a standby means (15c).
When the operation detecting means (15d) detects the operating state (open) of the high pressure switch (HPS) at the end of the standby operation of, the abnormality of the high pressure switch (HPS) is determined,
For example, an abnormality determining means (15f) for illuminating an abnormality lamp by determining a failure or disconnection of the switch itself is configured.

Next, the air conditioning operation will be described. In FIG.
During cooling operation of the air conditioner, the four-way switching valve (2) is switched to the solid line side in the figure, and the solenoid on-off valve (2) of the auxiliary heat exchanger (22)
4) is always open, the refrigerant compressed in the compressor (1) is condensed in the outdoor heat exchanger (6) and the auxiliary heat exchanger (22),
Each indoor unit (B) to (F) through the connecting pipe (11b)
Will be sent to the branch. In each of the indoor units (B) to (F), the pressure is reduced by each of the indoor electric expansion valves (13), ..., Evaporated by each of the indoor heat exchangers (12) ,, and then merged into the outdoor unit (A). It returns in a gas state and circulates so as to be sucked into the compressor (1).

Further, during the heating operation, the four-way switching valve (5) is switched to the side of the broken line in the figure, the flow of the refrigerant is opposite to that during the cooling operation, and the refrigerant compressed by the compressor (1) is heated in each room. After being condensed in the exchangers (12), ..., they merge and flow to the outdoor unit (A) in a liquid state, are decompressed by the outdoor electric expansion valve (8), ..., Evaporate in the outdoor heat exchanger (6), and then are compressed. Circulate back to machine (1).

Next, the startup compensation control of the compressor (1) when the power is turned on will be described based on the control flow shown in FIG.

First, when the power is turned on, in step ST1,
It is determined whether the operation detecting means (15d) detects the operating state of the high pressure switch (HPS), that is, the high pressure switch (HPS) does not become the open operating state during a normal shutdown. If there is no such operation, the operation proceeds to step ST2 to set the momentary blackout flag, while if not in operation, the operation proceeds from step ST1 to step ST3 to reset the instantaneous blackout flag.

After that, from step ST2 or step ST3 to step ST4
Then, it is determined whether or not the instantaneous blackout flag is set. That is, the power-on detection means (15b) constantly detects the power-on, and when the operation detection means (15d) detects the operation state (open) of the high pressure sensor (HPS) at the time of power-on, the standby operation means ( 15e) discriminates an instantaneous power failure and moves to step ST5 to activate the standby means (15c) and reset the instantaneous blackout flag,
You will return to ST4.

In other words, the high-pressure pressure switch (HPS) does not become active (open) during normal shutdown, so if this high-pressure pressure switch (HPS) is active when the power is turned on, there is a momentary power failure. When power is restored, the compressor (1) is kept in a stopped state for a predetermined period of time to equalize the pressure in the refrigerant circuit (14) and then the compressor (1) is driven to perform a normal air conditioning operation.

In step ST4, the high pressure switch (H
If PS) is not operating, there is no momentary power failure, so normal air conditioning operation is performed without moving to step ST5.

Although not shown in the control flow of FIG. 4, when the standby operation of the standby means (15c) ends, the operation detection means (15d)
The abnormality determination means (15f) determines whether the high pressure switch (HPS) is normal or not in response to the output signal of. That is,
When the standby operation is completed, the refrigerant circuit (14) is pressure-equalized, so that the high pressure is reduced. At that time,
When the high pressure switch (HPS) is in operation, there is an abnormality such as a failure or disconnection of the switch itself, and an abnormality lamp is turned on.

FIG. 5 shows another embodiment in which a pressure sensor (P1) is used instead of the high pressure switch (HPS) used in the previous embodiment.

That is, the controller (15a) is provided with a power-on detection means (15b) and a standby means (15c), and receives a pressure signal from the pressure sensor (P1) to obtain a pressure equivalent saturation temperature Tc or Te. Derivation saturation temperature detection means (15
g) is constituted, an outside air temperature sensor (TH8) which is an outside air temperature detecting means for detecting the outside air temperature is provided near the pressure sensor (P1) in the refrigerant circuit (14).

Further, the controller (15a) includes a temperature difference detecting means (15) for detecting a temperature difference between the pressure-equivalent saturation temperature and the outside air temperature.
h) a standby actuating means for actuating the standby means (15c) if the differential temperature is equal to or more than a predetermined value when the power is turned on in response to the output signals of the power-on detecting means (15b) and the differential temperature detecting means (15h). 15j) has been constructed.

Therefore, when the temperature difference between the saturation temperature equivalent to the pressure and the outside air temperature is equal to or more than the predetermined value when the power is turned on, it is determined that an instantaneous power failure has occurred, and the compressor (1) waits.

That is, as shown in FIG. 6, as the pressure equalization in the refrigerant circuit (14) progresses, the vapor pressure equivalent saturation temperature Te and the condensation pressure equivalent saturation temperature Tc gradually approach the outside air temperature T, and the compressor (1 ), A temperature β corresponding to a high / low differential pressure δ that can be activated is derived in advance, and a set temperature α is determined from the temperature β. For example, α =
When β / 4 is set and the detected differential temperature of the differential temperature detecting means (15h) is equal to or higher than the set temperature α, the compressor (1) is put into a standby operation to equalize the pressure of the refrigerant circuit (14).

In addition, when the electromagnetic relay (20S) is in the ON state during the cooling operation, the four-way switching valve (5) is switched to the state shown by the solid line in FIG. 2, and even if this electromagnetic relay (20S) is in the OFF state, there is a differential pressure. The four-way switching valve (5) does not switch, so an electromagnetic relay (20S)
Instantaneous power failure can be detected even when is OFF.

Further, as another embodiment, as shown in FIG. 2, a high pressure sensor (P2) which is a high pressure measuring means provided on the discharge side of the compressor (1) and a low pressure measuring means provided on the suction side are provided. May be used with some low pressure sensor (P3).

In other words, the high pressure sensor (P2) measures the high pressure of the refrigerant,
The low-pressure sensor (P3) measures the low-pressure pressure of the refrigerant, receives the output signals of both sensors (P2), (P3), and then the controller (15
The differential pressure detecting means (15i) of a) is adapted to detect the differential pressure. When the power is turned on, the differential pressure detecting means (15
When the detected differential pressure of i) is larger than the value obtained by multiplying the differential pressure δ at which the compressor (1) can be started by the safety factor K (0 <K <1), the standby operation means (15j) causes the compressor (1) to operate. The standby operation is performed to equalize the pressure in the refrigerant circuit (14).

Therefore, because the instantaneous power failure is detected by using the refrigerant status signal that controls the refrigerant in the refrigerant circuit (14), it is accurate even when the compressor (1) is not inverter-controlled or switched to commercial power. Since the instantaneous power failure can be detected, the standby operation of the compressor (1) can be reliably performed. As a result, the start-up compensation of the compressor (1) can be performed during the momentary power failure, and the control accuracy can be improved.

Furthermore, since it is not necessary to provide a dedicated backup circuit for detecting an instantaneous power failure and existing sensor signals are used, the movement compensation of the compressor (1) can be performed without increasing the number of parts. Furthermore, the standby operation of the compressor (1) is performed during the momentary power failure that requires the pressure equalization of the refrigerant circuit (14), so there is no unnecessary standby operation, and the air conditioning operation can be performed quickly, improving comfort. Can be planned.

Further, since it is possible to determine the abnormality of the high pressure switch (HPS), accurate air conditioning control can be performed, and in particular, the output signal of one high pressure switch (HPS) enables the high pressure switch (HPS) to operate. An abnormality can be detected, and control accuracy can be improved without increasing the number of parts.

Although the present embodiment has been described with respect to the multi-type air conditioner, the present invention is not limited to the multi-type,
It may be a dedicated cooling machine.

Further, the pressure equivalent saturation temperature may be derived by using the high pressure sensor (P2) or the low pressure sensor (P3).

[Brief description of drawings]

1 (a) and 1 (b) are block diagrams showing the configuration of the present invention. 2 to 6 show an embodiment of the present invention, FIG. 2 is a refrigerant circuit diagram of an air conditioner, FIG. 3 is an electric circuit diagram of an outdoor unit, and FIG. 4 is a start compensation control of a compressor. It is a flowchart which shows. FIG. 5 is an electric circuit diagram of an outdoor unit showing another embodiment, and FIG. 6 is a temperature characteristic diagram showing the relationship between the pressure-equivalent saturation temperature and the outside air temperature. (1) ... Compressor, (6) ... Outdoor heat exchanger, (12) ...
… Indoor heat exchanger, (13) …… Indoor electric expansion valve, (14)…
… Refrigerant circuit, (15)… Outdoor control unit, (15b)…
… Power-on detection means, (15c) …… Standby means, (15d)
...... Actuation detecting means (15e), (15j) ...... Standby operating means, (15f) ...... Abnormality determining means, (15g) ...... Saturation temperature detecting means, (15h) ...... Difference temperature detecting means, (15i ) …… Differential pressure detection means, (HPS) …… High pressure switch, (P1) …… Pressure sensor, (P2) …… High pressure sensor, (P3) …… Low pressure sensor.

Claims (5)

[Claims] A refrigerant circuit (14) comprising a compressor (1), a heat source side heat exchanger (6), an expansion mechanism (13) and a utilization side heat exchanger (12), which are connected in order by a refrigerant pipe (11). ), And drive control means (15) for controlling the drive of the compressor (1).
A power-on detection means (15b) for detecting power-on of the drive control means (15); and a standby state of the compressor (1) for a predetermined time during which the refrigerant circuit (14) equalizes the pressure. The drive control means (1
5) controlling standby means (15c), pressure detecting means (HPS) that operates when the refrigerant pressure in the refrigerant circuit (14) reaches a predetermined value, and whether the pressure detecting means (HPS) is in an operating state. Operation detecting means (15d) for detecting whether or not the power-on detecting means (15b) and operation detecting means (15)
The pressure detection means (HP
An operation control device for an air conditioner, comprising: a standby operation means (15e) for operating the standby means (15c) when S) is in an operating state. 2. A refrigerant circuit (14) in which a compressor (1), a heat source side heat exchanger (6), an expansion mechanism (13) and a utilization side heat exchanger (12) are connected in order by a refrigerant pipe (11). ), And drive control means (15) for controlling the drive of the compressor (1).
And the drive control means (1) so as to make the compressor (1) stand by in a stopped state for a predetermined time during which the refrigerant circuit (14) equalizes the pressure.
5) controlling standby means (15c), pressure detecting means (HPS) that operates when the refrigerant pressure in the refrigerant circuit (14) reaches a predetermined value, and whether the pressure detecting means (HPS) is in an operating state. When the pressure detecting means (HPS) is in the operating state at the end of the standby operation of the standby means (15c) in response to the output signal of the operation detecting means (15d) for detecting An operation control device for an air conditioner, comprising: an abnormality determination means (15f) for determining an abnormality of a detection means (HPS). 3. The operation control device for an air conditioner according to claim 1, wherein the pressure detection means (HPS) is provided at the end of the standby operation of the standby means (15c) in response to the output signal of the operation detection means (15d). When the pressure sensor is in operation, the pressure detection means (HPS)
An operation control device for an air conditioner, which is provided with an abnormality determining means (15f) for determining an abnormality of the air conditioner. 4. A refrigerant circuit (14) in which a compressor (1), a heat source side heat exchanger (6), an expansion mechanism (13) and a utilization side heat exchanger (12) are connected in order by a refrigerant pipe (11). ), And drive control means (15) for controlling the drive of the compressor (1).
A power-on detection means (15b) for detecting power-on of the drive control means (15); and a standby state of the compressor (1) for a predetermined time during which the refrigerant circuit (14) equalizes the pressure. The drive control means (1
5) standby means (15c) for controlling the temperature, saturation temperature detection means (15g) for detecting the saturation temperature equivalent to the pressure of the refrigerant in the refrigerant circuit (14), and outside temperature detection means (TH8) for detecting the outside air temperature. , The saturation temperature detecting means (15g) and the outside air temperature detecting means (T
H8) receiving the output signal, the temperature difference detecting means (15h) for detecting the temperature difference between the saturation temperature equivalent to the pressure and the outside air temperature, the power-on detecting means (15b) and the temperature difference detecting means (15).
An air conditioner comprising a standby operation means (15j) for operating the standby means (15c) when the temperature difference is equal to or more than a predetermined value when the power is turned on in response to the output signal of (h). Operation control device. 5. A refrigerant circuit (14) in which a compressor (1), a heat source side heat exchanger (6), an expansion mechanism (13) and a utilization side heat exchanger (12) are connected in order by a refrigerant pipe (11). ), And drive control means (15) for controlling the drive of the compressor (1).
A power-on detection means (15b) for detecting power-on of the drive control means (15); and a standby state of the compressor (1) for a predetermined time during which the refrigerant circuit (14) equalizes the pressure. The drive control means (1
5) Controlling standby means (15c), high pressure measuring means (P2) for measuring the high pressure of the refrigerant in the refrigerant circuit (14), and low pressure measuring for measuring the low pressure of the refrigerant in the refrigerant circuit (14) Means (P3), a differential pressure detecting means (15i) for detecting the differential pressure between the high pressure and the low pressure by receiving the output signals of the high pressure measuring means (P2) and the low pressure measuring means (P3), and the power-on. Detection means (15b) and differential pressure detection means (15
An air conditioner comprising: a standby actuation means (15j) for actuating the standby means (15c) when the differential pressure exceeds a predetermined value when the power is turned on upon receiving the output signal of i). Operation control device.