JPH05312419A - Energization control device for freezer device - Google Patents

Abstract

PURPOSE:To prevent an abnormal stopping for protection of hydraulic system or a liquid compression which may be caused by mixture of refrigerant into lubricant oil, when the operation is started again after stopping of a freezer device. CONSTITUTION:There is provided a heating device CH for heating lubricant oil within a compressor 1. An abnormal reduction of hydraulic pressure is detected by a differential pressure switch 63QL. As the differential pressure switch 63QL is operated until a specified time elapses after energization of the compressor 1, the compressor 1 is stopped by a reenergization control means 51 and the heating device CH is operated for a setting time, thereafter the compressor 1 is energized again. In addition, the stopping time of the freezer device is counted, and when the operating after stopping is restarted and an operating instruction is received, the heating device CH is operated while the compressor 1 is being stopped during a predetermined time corresponding to the stopping time by the energization control means 52. With such a control as above, before energization of the compressor 1, or when abnormal hydraulic pressure is detected after energization, refrigerant in the lubricant oil is removed and a smooth energization of the compressor 1 is assured while abnormal stopping or liquid compression being avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start-up control device for a refrigeration system after a long period of non-operation, and more particularly to measures for preventing a start-up failure resulting from the dissolution of a refrigerant in lubricating oil of a compressor.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Publication No. 3-10865.
As disclosed in the publication, as a start control device for a refrigeration system equipped with a hydraulic pressure protection switch that operates when the pressure of the lubricating oil of the compressor falls below a prescribed pressure, the hydraulic pressure protection switch is activated during operation of the compressor. If it continues operating for more than an hour, the amount of lubricating oil in the compressor is secured by performing a refrigerant recovery operation.
It is well known to avoid abnormal stoppage of the refrigeration system due to the dissolution of the refrigerant in the lubricating oil in the crankcase of the compressor and the accumulation of the refrigerant in the evaporator, and to maintain smooth operation. It is a technology.

[0003]

By the way, while the refrigeration system is idle for a long time due to long holidays or seasonal non-use, the refrigerant melts in the lubricating oil in the crankcase of the compressor. A phenomenon called "sleeping" may occur. In particular, in a multi-type air conditioner having a large number of indoor units, the amount of refrigerant is large,
The refrigerant gradually returns from the suction side to the inside of the compressor during a long period of rest, and the returned refrigerant dissolves in the lubricating oil, so that this "sleeping" is likely to occur. Therefore, when restarting the refrigeration system after stopping the refrigeration system, the crankcase heater of the refrigeration system is energized for a certain period of time after the power is turned on to heat the lubricating oil and sufficiently evaporate the refrigerant. Since then, it is designed to start the compressor.

However, there are cases where such energization before starting is not sufficiently performed in reality, and the energization time required for evaporation of the refrigerant may not be reached when the down time is particularly long. .. Then, if the compressor is started in a state where the evaporation of the refrigerant is insufficient, the refrigerant dissolved in the lubricating oil causes forming, so that the hydraulic pressure does not rise above the predetermined pressure necessary for the operation of the compressor. There is a risk that the hydraulic protection switch will operate and the refrigeration system will stop abnormally. In addition, when a large amount of liquid refrigerant "lays down" in the lubricating oil, liquid compression may occur and the compressor may be damaged.

In such a case, it is also possible to carry out a refrigerant recovery operation as in the above-mentioned conventional one. However, when the amount of the melted refrigerant is large during a long period of non-operation, the equipment may be damaged during that time. There was a problem that this could not be resolved.

On the other hand, if the crankcase heater is energized for an unnecessarily long time, the lubricating oil may be deteriorated.

The present invention has been made in view of the above problems, and an object thereof is to reliably remove a refrigerant without causing deterioration of lubricating oil when the compressor is started after the refrigeration system is stopped. By taking such a means for heating the lubricating oil, it is possible to ensure smooth startup while preventing abnormal stoppage of the refrigeration system and liquid compression due to the operation of the hydraulic pressure protection switch, thereby improving reliability.

[0008]

In order to achieve the above object, the means taken by the invention of claim 1 is provided in the refrigerant circuit (14) as shown in FIG. 1 (solid line and broken line portions). A compressor (1), a heating device (CH) for heating the lubricating oil of the compressor (1), and a hydraulic pressure abnormality detecting means (63QL) for detecting when the pressure of the lubricating oil is below a predetermined pressure. It is premised on a refrigeration system equipped with.

As a start-up control device for the refrigeration system,
When the output of the hydraulic pressure abnormality detection means (63QL) is received before a certain time has passed after the start of the compressor (1), the compressor (1) is forcibly stopped and the heating device (CH) is set. After being operated for a period of time, a restart control means (51) for controlling the compressor (1) to restart is provided.

The means taken by the invention of claim 2 is based on the same refrigerating apparatus as the invention of claim 1.

Then, as shown in FIG. 1 (solid line portion and dotted line portion), as an operation control device of the refrigerating apparatus, a rest time measuring means (Tm4) for measuring the rest time of the refrigerating apparatus and an operation after the refrigerating apparatus is stopped When receiving a start command, the heating device (CH) is operated while the compressor (1) is stopped for a predetermined time period according to the down time of the refrigerating device measured by the down time measuring means (Tm4). After that, the compressor (1)
And a start-up control means (52) for controlling the start-up.

A start-up control device for a refrigerating apparatus, which is characterized by being provided.

The means taken by the invention of claim 3 is, in the invention of claim 2, as shown by the broken line portion in FIG. 1, the above-mentioned abnormal hydraulic pressure until a certain time elapses after the compressor (1) is started. When the output of the detection means (63QL) is received, the compressor (1) is forcibly stopped, the heating device (CH) is operated for a set time, and then the compressor (1) is restarted. A restart control means (51) for controlling is provided.

According to a fourth aspect of the present invention, in the above second or third aspect of the invention, the activation control means (52) is provided.
When the downtime of the refrigeration system is less than or equal to the lower limit value, the compressor (1) is controlled to be activated without operating the heating device (CH).

According to a fifth aspect of the present invention, in the above first or third aspect of the invention, the restart control means (51) causes the compressor (1) to restart the compressor (1) as shown by the alternate long and short dash line in FIG. An abnormal stop means (53) is provided for controlling the refrigeration system to stop abnormally when the output of the hydraulic pressure abnormality detection means (63QL) is received after a lapse of a fixed time after starting.

As shown in FIG. 6, the means taken by the invention of claim 6 is the compressor (1) interposed in the refrigerant circuit (14).
And a heating device (CH) for heating the lubricating oil of the compressor (1), and a hydraulic pressure abnormality detecting means (63) for detecting when the pressure of the lubricating oil falls below a predetermined pressure and operating the protective device.
QL) and refrigeration equipment with.

Then, as a start-up control device for the refrigeration system,
An outside air temperature detecting means (Tha) for detecting the outside air temperature, an oil temperature detecting means (LP) for detecting the temperature of the lubricating oil of the compressor,
When an operation start command is received while the refrigeration system is stopped, the outside air temperature detecting means (T
outside temperature detected by ha) and the oil temperature detection means (L
After comparing the temperature of the lubricating oil detected in P), the heating device (CH) is operated until the temperature of the lubricating oil becomes higher than the ambient temperature by a certain value or more, and then the compressor (1) is started. A standby control means (54) for controlling the above is provided.

[0018]

With the above construction, in the invention of claim 1, an operation start command is issued after the refrigeration system has been stopped for a long time, and the hydraulic pressure abnormality detecting means (by the time when a predetermined time elapses after the start of the compressor (1)). 63QL) operation, restart control means (5
Since the compressor (1) is stopped by 1) and the heating device (CH) is operated for a set time, the compressor melted in the lubricating oil in the compressor (1) during a long rest period. The refrigerant evaporates and is removed. Therefore, smooth start of the compressor (1) is ensured while avoiding abnormal stop.

According to the second aspect of the invention, when the refrigeration system is restarted after being suspended, the refrigeration system downtime is measured by the downtime measuring means (Tm4), and the start control means (52) responds to the downtime. Heating device (CH) for a predetermined time
Is controlled so that the refrigerant in the lubricating oil is reliably removed without causing deterioration of the refrigerant even when the manual preheating at the time of restarting the operation is not accurately performed, and the compressor (1) Will ensure a smooth start.

According to the invention of claim 3, the starting control means (52) in the invention of claim 2 controls the heating device (CH) at the time of starting, and after the compressor (1) is started, the hydraulic pressure is changed. When the abnormality detecting means (63QL) operates, the control of the restart control means (51) according to the invention of claim 1 is performed, so that abnormal stop and liquid compression due to the operation of the hydraulic pressure protection can be prevented more reliably. ..

In the invention of claim 4, in the control of the starting control means (52) in each of the above inventions, the heating device (CH) is operated when the operation is restarted when the down time of the refrigerating device is less than a predetermined lower limit value. Instead, the compressor (1) is controlled so as to be started, so that unnecessary operation of the heating device (CH) that deteriorates the comfort of air conditioning is avoided.

According to the fifth aspect of the present invention, when the hydraulic pressure abnormality detecting means (63QL) detects an abnormality in the hydraulic pressure after a certain time has elapsed since the compressor (1) was restarted, the abnormal stopping means (53). Causes the refrigeration system to stop abnormally.
Abnormal hydraulic pressure when it is judged that the refrigerant in the lubricating oil has been sufficiently removed after a lapse of a certain time after startup is distinguished from hydraulic abnormality due to so-called "sleeping" of the refrigerant, and reliability is deteriorated due to failure of the hydraulic system. Is reliably prevented.

According to the sixth aspect of the present invention, when the refrigeration system is restarted after being suspended, and when an operation start command is received, the standby control means (54) causes the temperature difference between the oil temperature and the outside air temperature to become a certain value or more. Until then, the heating device (CH) operates with the compressor (1) stopped, so that deterioration of comfort of air conditioning due to excessive operating time of the heating device (CH) is prevented.

[0024]

Embodiments 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, where (X) is an outdoor unit and (Y1), (Y2), ... Are parallel to the outdoor unit (X). Is an indoor unit connected to. Inside the outdoor unit (X), two three-way switching valves (SV1), (S
V2) changes the operating capacity to 100%, 67%, 3
A compressor (1) adjusted in 3 steps of 3% and a first (1) for separating oil in the gas refrigerant discharged from the compressor (1).
The second oil separators (4a) and (4b), a four-way switching valve (5) that switches as shown by the solid line in the figure during cooling operation, and switches as shown by the broken line in the figure during heating operation, and a condenser and heating during cooling operation. A pair of outdoor heat exchangers (6a) that become evaporators during operation,
(6b) and two outdoor fans (F1) and (F2) attached to the outdoor heat exchangers (6a) and (6b) are arranged. The outdoor heat exchangers (6a), (6b) are
They are arranged in parallel in the circuit, and each outdoor heat exchanger (6
a) and (6b), a pair of outdoor electric expansion valves (8a1), (8a2) and (8b1), (8b2) that adjust the refrigerant flow rate during the cooling operation and throttle the refrigerant during the heating operation.
Are arranged. Further, the outdoor unit (X) is provided with a receiver (9) for storing the liquefied refrigerant and a pair of first and second accumulators (10a), (10b), and The devices (1) to (10b) are sequentially connected by a refrigerant pipe (11) so that the refrigerant can flow. The indoor units (Y1), (Y2), ... Have the same configuration, and each has an indoor heat exchanger (12) and its fan (12a) that serve as an evaporator during cooling operation and a condenser during heating operation, and heating. An indoor electric expansion valve (1 that adjusts the refrigerant flow rate during operation and throttles the refrigerant during cooling operation
3) and 3) are respectively provided, and the liquid side manual shutoff valve (1
7) and the gas side manual shutoff valve (18), and is connected to the outdoor unit (X) by a liquid side communication pipe (11a) and a gas side communication pipe (11b). That is, each of the above devices is connected by a refrigerant pipe (11) so that the refrigerant can flow, and a main refrigerant circuit (14) for releasing the heat obtained by heat exchange with the outdoor air to the indoor air is provided. It is configured.

Next, in addition to the above-mentioned main devices, various auxiliary devices are provided. A pressure equalizing hot gas bypass passage (11d) is provided between the discharge pipe and the suction pipe for equalizing the high pressure side pressure and the low pressure side pressure when the compressor (1) is stopped, and the like. In the pressure equalizing hot gas bypass passage (11d),
When the compressor (1) is stopped due to a thermo-off state or the like, a pressure equalizing on-off valve (21) is provided which is opened for a fixed time before restarting. Further, the first and second oil separators (4a),
An oil return pipe (33) for returning oil via the capillary tube (32) is provided from (4b) to the rising pipe at the outlet of the second accumulator (10b). Further, there is provided a heating overload control circuit (11e) for connecting the discharge pipe between the oil separators (4a) and (4b) -four-way switching valve (5) and the upper part of the receiver (9). The heating overload control circuit (11e) is provided with an auxiliary heat exchanger (6c), a capillary tube (23), and an overload control on-off valve (SVS) in this order from the discharge pipe side. Further, a liquid injection bypass passage (1) that bypass-connects the liquid pipe between each outdoor electric expansion valve (8a1)-(8b2) -receiver (9) and the suction pipe upstream of the accumulator (10).
1f) is provided, and an injection opening / closing valve (SVL) that opens / closes to adjust the overheating of the suction refrigerant is interposed in the bypass passage (11f). In addition, (GP)
Is a gate port.

Further, many sensors are arranged in the apparatus, and (Th1a) and (Th1b) are the outdoor heat exchangers (6a),
A gas pipe sensor for detecting the gas pipe temperature of (6b), (Th2
a) and (Th2b) are liquid pipe sensors that detect the liquid pipe temperatures of the outdoor heat exchangers (6a) and (6b), and (Thd) is a discharge pipe sensor that detects the discharge pipe temperature of the compressor (1). (Thr) is an indoor suction sensor that is arranged at the air suction port of each indoor unit (Y1) to detect the temperature of the suction air (room temperature), and (Tha) is the air suction of the outdoor heat exchangers (6a), (6b). Placed in the mouth,
An outside air temperature sensor as an outside air temperature detecting unit that detects the outdoor intake air temperature as the outside air temperature Ta, (LP) is a low pressure sensor that detects the suction pressure (low pressure side pressure), and (63QL) is the pressure difference between the suction pressure and the hydraulic pressure. Differential pressure sensor for detecting
P) is a high pressure sensor that detects the discharge pressure (high pressure side pressure),
(63H) is a high pressure switch for protecting the compressor,
The signals of these sensors can be input to a controller (not shown) of the air conditioner.

In FIG. 2, during cooling operation of the air conditioner, the four-way switching valve (5) is switched to the solid line side in the figure, and the refrigerant compressed by the compressor (1) is transferred to each outdoor heat exchanger (6a). ，
After being condensed in (6b) and stored in the receiver (9),
Each indoor unit (Y
1), (Y2), ... In each of the indoor units (Y1), (Y2), ..., The refrigerant is decompressed by each indoor electric expansion valve (13), evaporated in each indoor heat exchanger (12), and then merged to form a gas side communication pipe (11b). ) To the outdoor unit (X), and the accumulator (10a),
After the liquid refrigerant mixed in (10b) is removed, it is circulated so as to be sucked into the compressor (1).

Further, during the heating operation, the four-way switching valve (5)
Is switched to the broken line side in the figure, the flow of the refrigerant is opposite to that during the cooling operation, and the refrigerant compressed in the compressor (1) is condensed in the indoor heat exchangers (12), (12) ,. Then, they merge and flow in a liquid state to the outdoor unit (X), and are stored in the receiver (9). Then, the outdoor electric expansion valves (8a1) to (8)
It is decompressed by b2) and each outdoor heat exchanger (6a), (6
After evaporation in b), it circulates back to the compressor (1).

Next, regarding the electric circuit of the air conditioner,
It will be described with reference to FIG. In FIG. 3, the external device circuit (100) is connected to the three-phase AC power supply (TeS), and the main device drive board (110) and the valve drive are connected to the two-phase wiring in the three-phase AC power supply. The substrate (120) is connected. Further, a control board (130) is connected to the main device drive board (110) via a first transformer (Tr1).

In the external device circuit (100),
(MC) is a compressor motor for driving the compressor (1), and (MF1) and (MF2) are fan motors for driving two outdoor fans (F1) and (F2), respectively. In the compressor motor (MC), a normally open contact (52C-1) of an electromagnetic relay (52C) for starting and stopping, which will be described later, and a fuse for opening an overcurrent protection switch (51C), which will be described later, ( 51C-f) are connected in series, and normally open contacts (42C-1) and (6C-1) of electromagnetic relays (42C) and (6C) for start-up control are additionally provided. Further, each fan motor (MF1), (MF2) has a normally open contact (52F1-) of an electromagnetic relay (52F1), (52F2) for starting and stopping, which will be described later.
1), (52F2-1) and overcurrent protection switch (51F1), (51
Fuse (51F1-f), (51F2) for opening F2)
-f) and are connected in series.

The main device drive board (110) has a high voltage protection switch (63H), an overcurrent protection switch (51C) of the compressor (1), and a temperature rise protection switch (49C) of the compressor (1). ) And fan overcurrent protection switch (51F
1), (51F2) and protection circuit (111)
And normally open relay contacts (RY2), (RY4), (RY
6), (RY7) and (RY8) connected in series with fan drive electromagnetic relays (52F1), (52F2), compressor drive electromagnetic relay (52C) and compressor start control electromagnetic relay (42)
C) and (6C) are arranged in the first actuator drive circuit (112), and normally open relay contacts ((RY9)-
(RY15) electromagnetic relay (WL) for abnormality indication connected in series, electromagnetic relay (20S) for switching the four-way switching valve (2), three-way switching valve for unloader (SV)
1), electromagnetic relay (20RS1) for switching (SV2),
(20RS2), electromagnetic relay (20R1) for opening and closing the pressure equalizing on-off valve (SVP), electromagnetic relay (20R2) for opening and closing the overload control on-off valve (SVS), and injection on-off valve (SVL) A second actuator drive circuit (113) provided with an electromagnetic relay (20R3) for opening and closing is provided as a main circuit.

Here, (CH1) is attached to the crankcase in which the lubricating oil of the compressor (1) is stored, a crankcase standard heater for heating the lubricating oil, and (CH2) is a crankcase auxiliary heater. Therefore, the above-mentioned crankcase standard heater (CH1) and crankcase auxiliary heater (CH2) constitute a heating device (CH) according to the present invention. Then, the crankcase standard heater (CH1) is operated for a certain period of time after the power is turned on after the air conditioner is stopped and before the operation of the air conditioner is started.
It is set to be energized manually, and is energized when the thermostat is off during normal operation, and is controlled so that it is forcibly energized together with the crankcase auxiliary heater (CH2) under predetermined conditions as described below. is there.

Further, (52C-2) is a normally open contact of the compressor driving electromagnetic relay (52C), which turns on the crankcase heater (CH). What is turned off, (Q1) is a power generation power transistor.

On the other hand, the valve drive substrate (120) is
Pulse motors (20E1) to (20E4) of four outdoor electric expansion valves (8a1) to (8b2) are arranged via the second transformer (Tr2).

Further, the control board (130) has
Service mode selector switch (DS1), compressor forced operation or hydraulic pressure protection reset setting switch (SS1), low noise input selector switch (SS2), cooling / heating selector switch (SS3),
Pipe length setting switch (SS4), high pressure adjustment switch (SS
5), a defrost switch (SS6) and a compressor forced operation button switch or a hydraulic pressure protection reset button switch (BS1) are provided, and the hydraulic pressure differential pressure sensor (63QL), each gas pipe sensor (Th1a), (Th1b),
Discharge pipe sensor (Thd), each liquid pipe sensor (Th2b), (Th2
b), a high pressure sensor (HP) and a low pressure sensor (LP) are connected via a signal line.

In this embodiment, at the time of maintenance of the compressor, the suction closing valve (HVS) is closed, the compressor forced operation switch (Ss1) in the control board (130) is turned on, and the following pump down is performed. Take control. That is, when the compressor (1) is operated at 33% load by this forced operation, the compressor (1) is not stopped by a protection device other than the direct cut type in order to protect the discharge pressure. For controlling each actuator, the outdoor fans (F1) and (F2) are turned on, and the outdoor electric expansion valves (8a1) to (8b2) are fully opened.
At 00 pulse, the pressure equalizing on-off valve (SVP) and overload control on-off valve (SVS) open, and the injection on-off valve (SVL)
Is closed and the four-way switching valve (5) is on the cooling cycle side. Then, the low pressure side pressure Lp detected by the low pressure sensor (LP)
Is 0.5 (kg / cm ² ) or less or 3 minutes have passed, the compressor (1) is stopped, the discharge closing valve (HVD) of the compressor (1) is closed, and the compressor (1) is closed. Is removed to perform predetermined maintenance. in this way,
The compressor (1) is not operated by using the remote control device on the indoor side, but the compressor (1) is removed only by the operation on the outdoor side by using the compressor forced operation switch (SS1). As a result, the maintenance work is shortened.

Next, the contents of the start control of the first embodiment according to the invention of claim 1 will be explained based on the control state transition diagram of FIG.

In the rest state S-0 of the air conditioner in which the compressor flag CompF is "0", an operation start command is received, and "1" and "0" are received according to the operation and stop of the compressor (1), respectively. When the compressor flag CompF becomes “1”, the intermediate step ST1 starts counting the timer (Tm1) for 5 minutes, then shifts to the control state S-1, and sets the compressor standby flag OWLF to “0”. Then, the abnormality flag OLIJF is set to "0", the hydraulic pressure abnormality display LED is turned off, and the startup operation is performed. When the timer (Tm1) for 5 minutes expires in this state, the control state S-2 is entered and the same control state as the control state S-1 is maintained.
Perform normal operation. Here, the compressor standby flag OWLF
"1" is for stopping the compressor (1), alarm flag OLIJF is "1" for alarm processing, and abnormal flag OLI
JF is a system error and becomes "1".

On the other hand, the control state S-1 of the rising operation is
Then, when the hydraulic pressure differential pressure switch (63QL) is activated by the time the 5-minute timer (Tm1) expires and the OPC activation flag becomes "1", the intermediate timer ST2 activates the 1-hour timer (Tm2). Control state S after counting starts
In step -7, the compressor standby flag OLWF is set to "1", the alarm flag OLWRF is set to "1", and the auxiliary heater flag OLCHF is set to "1". That is, the air conditioner is forced to the thermostat off state, the compressor (1) is stopped, the alarm FE is output, and the compressor standby flag OLWF = 1 is set to energize the crankcase standard heater (CH1) and the auxiliary heater flag. By setting OLCHF = 1, the crankcase auxiliary heater (CH2) is turned on. Then, when the timer (Tm2) for 1 minute expires in this state, the control state S-
Move to 2.

When the hydraulic pressure protection is activated in this control state S-2, after the number of retries N is set to "1" in the intermediate step ST3, it is judged in the intermediate step ST4 whether or not there is an oil retry J, and If there is no retry J, after counting the timer for 30 minutes in the intermediate step ST5, the control state S-3 is entered and the compressor standby flag OLWF is set to "1". When it becomes "0", the control state S-4 is entered and the compressor standby flag O
When LWF is set to "0" and the compressor flag COMPF becomes "1" in this state, the control state S-5 is entered and the compressor standby flag OLWF is maintained at "0". Further, when the hydraulic pressure protection switch is operated in this state, it is determined in the intermediate step ST6 whether or not the number of retries N has reached 5 times or more, and if it is not 5 times or more, the intermediate step ST7 is further performed.
Then, the number of retries N is updated, and the above control is repeated until the number of retries N becomes 5 or more in the determination in the intermediate step ST6.

On the other hand, when there is an oil retry J in the determination of the intermediate step ST4, or in the control states S-3 to S
When the -5 retries are repeated 5 times or more, the control state S-6 is entered, and the compressor standby flag OWLF is set to "1".
Then, the abnormality flag OLIJF is set to "1" and the oil abnormality display LED is turned on to bring the air conditioner into the abnormal stop state. Then, when the abnormal reset is turned on in the control state S-6,
The control state S-2 is restored.

In the above control, the restart control means (51) according to the invention of claim 1 is constituted by the control of the control state S-7 and the control state S-2. Further, by the control of shifting from the auxiliary step ST6 to the control state S-6,
The abnormal stop means (53) according to the invention of claim 5 is constituted.

Therefore, in the control of the first embodiment,
An operation start command (by turning on the power supply) is issued after the air conditioner has been stopped for a long time, and a differential pressure switch is activated before a certain time (5 minutes in the first embodiment) has elapsed after the compressor (1) was started. When there is an operation of (63QL), the restart control means (51) forcibly turns off the thermostat and stops the compressor (1), and the crankcase heater (for one hour in the above-described embodiment) CH) and the crankcase auxiliary heater (CH2) are turned on (control state S-7 in the control state transition diagram). That is, if the refrigerant is dissolved in the lubricating oil in the crankcase of the compressor (1) due to a long pause, the refrigerant will form with the start-up of the compressor (1) and the hydraulic pressure will drop, causing a difference. The pressure switch (63QL) will operate, but at that time, instead of stopping abnormally, the compressor (1) is stopped and the crankcase heater (CH) and crankcase auxiliary heater (CH2) are stopped for a set time. Is turned on, the temperature of the lubricating oil rises during this period, and the liquid refrigerant dissolved in the lubricating oil evaporates and is released. Since the compressor (1) is restarted after this forced thermostat-off operation, the compressor (1) can be smoothly started without causing abnormal stoppage or liquid compression due to the operation of the differential pressure switch (63QL). Secured, thus
It is possible to improve reliability.

Further, if the abnormal stop means (53) according to the fifth aspect of the invention causes the differential pressure switch (63QL) to operate after a certain time has elapsed since the compressor (1) was restarted, the air conditioner. Differential pressure switch (63QL) due to so-called "sleeping" of the refrigerant
Is distinguished from the operation of the differential pressure switch (63QL) due to the failure of the hydraulic system other than that, and an abnormal stop due to the failure of the hydraulic system can be secured, and there is an advantage that the deterioration of reliability can be prevented. ..

Next, the contents of the startup control of the second embodiment according to the invention of claim 2 will be explained based on the flowchart of FIG.

First, when the air conditioner is stopped in step SR1, a battery-type pause timer (Tm4) for measuring the pause time T4 of the air conditioner is set in step SR2. Then, after stopping the air conditioner, step SR
In step 3, when the power of the air conditioner is turned on, step S
At R4, the pause timer (Tm4) is turned off and the pause time of the air conditioner is measured.

Next, in step SR5, the preheating time T5 in which only the crankcase standard heater (CH1) is heated
The preheating timer (Tm5) for measuring is turned on, and when the operation command is output from the remote controller or the like in step SR6, the preheating timer (Tm5) is turned off in step SR7 and the preheating time T5 is measured. After that, step SR8
Then, it is judged whether the pause time T4 measured by the pause timer (Tm4) is within 2 hours or not. If T4 ≤ 2 hours, it is determined that there is no "sleeping" of the refrigerant because the pause time T4 is short. Then, the process proceeds to step SR10 to output a start command for the compressor (1) without energizing the crankcase heater (CH).

On the other hand, if it is determined in step SR8 that T4
If ≤2Hr is not satisfied, the routine proceeds to step SR9, where it is determined whether or not the preheating time T5 measured by the preheating timer (Tm5) is 8 hours or more. If T5 ≥8Hr, sufficient preheating is performed. If so, the process proceeds to step SR10 as it is, and the start command for the compressor (1) is output. However, if T5 ≧ 8 Hr is not satisfied, the preheating of the lubricating oil may be insufficient. , Shift to step SR11,
The following additional heating control is performed. That is, step SR1
1. From the rest time T4 and the preheating time T5 measured by the timers (Tm4) and (Tm5), the formula (T4 /
3) The judgment value A is calculated based on -T5 -2 = A. If A≤0, the pause time T4 was short,
It is judged that there is no problem even if the preheating time T4 is short, the process proceeds to step SR10 and a start command is output, but if A ≧ 8, the preheating time T5 is short even if the down time is long. Therefore, it is determined that the heating is insufficient, and in step SR12, the crankcase heater (CH1) and the crankcase auxiliary heater (CH2) are forcibly energized for (8-T5) hours, and then the process proceeds to step SR10 and the compressor ( The start command of 1) is output. If O <X <8, it is determined that there is a fear of insufficient heating, and the crankcase heater (CH1) and the crankcase auxiliary heater (CH2) are set to {(T4 / 3) -T5 in step SR13. −
2} After the power is forcibly energized for each time, step S
Proceed to R10 to output a start command.

In the above flow, steps SR11-SR11
The control for proceeding from SR13 to SR10 constitutes the activation control means (52) according to the invention of claim 2 or 3.

Further, by controlling the shift from step SR8 to SR10, when the downtime of the refrigerating apparatus according to the invention of claim 4 is not more than the lower limit value, the compressor (1) is forcedly heated without heating the crankcase heater (CH). The function of the activation control means (52) for activating (1) is configured.

Therefore, in the second embodiment, when the air conditioner restarts its operation after the air conditioner is stopped, the stop time T4 of the air conditioner is measured by the stop timer (Tm4) and the start control means ( 52), the rest time T4
Accordingly, the crankcase heater (CH) is energized. That is, the preheating time T of the crankcase standard heater (CH1) made by the administrator of the air conditioner, etc.
In consideration of 5, the longer the down time T4 and the shorter the preheating time T5, the more the crankcase standard heater (C
H1) and the crankcase auxiliary heater (CH2) are controlled so as to extend the simultaneous energization time. Therefore, even when the preheating that depends on manual work is not accurately performed, the refrigerant in the lubricating oil can be reliably removed without causing deterioration of the refrigerant, and a smooth start of the compressor (1) is ensured. can do.

In the above embodiment, only the crankcase standard heater (CH1) is preliminarily manually preheated, but the present invention is not limited to this embodiment, and manual preheating is performed. It is also applicable to things that are not done at all.

Crankcase auxiliary heater (CH2)
Is not always necessary, and only the crankcase standard heater (CH1) may be additionally energized. However, by separately providing the crankcase auxiliary heater (CH2), when only preheating is required, the refrigerant is removed without causing deterioration of the refrigerant by heating only the crankcase standard heater (CH1), and the operation start command is issued. When it is determined that the preheating is insufficient when the output is made, there is an advantage that the crankcase auxiliary heater (CH2) is also used to heat the crankcase in a short time to prevent deterioration of comfort of air conditioning.

Further, although the embodiment is omitted, the crankcase heater (C) at the time of start-up is controlled by the start-up control means (52) shown in the second embodiment as in the invention of claim 3.
After the heating control of (H) is performed and the compressor (1) is started,
The forced thermostat may be controlled by the restart control means (51) shown in the first embodiment. In that case, abnormal stop and liquid compression due to the operation of the hydraulic pressure protection can be more reliably prevented, and a remarkable effect can be exhibited.

Further, due to the function of the starting control means (52) according to the invention of claim 4, the down time T of the air conditioner is
When 4 is equal to or lower than a predetermined lower limit value (2 Hr in the above embodiment), when the compressor (1) is started without energizing the crankcase heater (CH), unnecessary crankcase (CH) It is possible to prevent the comfort of air conditioning from being sacrificed during that time by heating (1).

Next, a third embodiment according to the invention of claim 6 will be described with reference to the flowchart of FIG. Also in this embodiment, the refrigerant piping system of the air conditioner is the same as that shown in FIG. 2 in the first embodiment.

First, when the operation command is output in step SQ2 while the operation of the air conditioner is stopped in step SQ1, the crankcase heater (C
H) is turned on, and in step SQ4, the outside air temperature Ta detected by the outside air temperature sensor (Tha) and the low pressure sensor (L) are detected.
The saturation temperature Te corresponding to the suction pressure detected in P) is input. That is, the saturation temperature Te corresponding to the suction pressure is the oil temperature in the crankcase. Then, in step SQ5, the oil temperature T
The temperature difference (Te-Ta) between e and the outside air temperature Ta is a constant value K.
If it is determined that Te-Ta ≧ K, the process proceeds to step SQ6, the crankcase heater (CH) is turned off, and the start command of the compressor (1) is output in step SQ7.

In the above flow, steps SQ3 ...
The control of SQ7 constitutes the standby control means (54) according to the invention of claim 6.

Therefore, in the third embodiment, when the operation of the air conditioner is restarted after the suspension, the standby control means (54) causes the temperature difference between the oil temperature Te and the outside air temperature Ta to be received. The crankcase heater (CH) is operated while the compressor (1) is stopped until (Te-Ta) becomes a certain value K or more, and the compressor (1) is operated after Te-Ta ≧ K. Is activated. In that case, as in the past,
The manager of the air conditioner manually sets the set time (for example, 6 to
In the case where the crankcase heater (CH) is energized only for 8 hours, the crankcase heater (CH) is set because the set time is set assuming the worst state.
The energization time becomes longer, the comfort of air conditioning is sacrificed during that time, and in some cases, insufficient preheating may cause abnormal stop due to hydraulic pressure protection or liquid compression. On the other hand, in the third embodiment, by securing the optimum heating time, it is possible to improve the comfort of air conditioning while maintaining the reliability.

The constant value K in the third embodiment described above.
May be changed according to the outside air temperature Ta.

Further, in the above embodiment, an example in which the present invention is applied to a multi-type air conditioner has been described, but the present invention is not limited to such an embodiment, and, for example, a separate type air conditioner or a refrigerating machine. The same can be applied to machines and the like. However, particularly in the multi-type air conditioner, since the refrigerant filling amount in the refrigerant circuit is large, so-called "sleeping" in the lubricating oil is likely to occur during a long rest period, and the effect of applying the present invention is large.

[0063]

As described above, according to the first aspect of the present invention, an operation start command is issued after the refrigeration system has been stopped for a long time, and an abnormal hydraulic pressure is detected before a certain time elapses after the compressor is started. When it is detected, the compressor is stopped and the heating device is operated for the set time.Therefore, the refrigerant dissolved in the lubricating oil in the compressor is removed during a long period of inactivity, and abnormal stop or liquid compression is performed. It is possible to ensure smooth startup of the compressor while avoiding the above, and thus to improve reliability.

According to the invention of claim 2, when the operation is restarted after the refrigeration system is stopped, the heating device is operated for a predetermined time corresponding to the down time of the refrigeration system. Even when the preheating is not done accurately,
The refrigerant in the lubricating oil can be reliably removed without causing deterioration of the refrigerant, and smooth startup of the compressor can be ensured while avoiding abnormal stoppage and liquid compression.

According to the invention of claim 3, in the invention of claim 2, when the hydraulic pressure abnormality is detected after the compressor is started, the restart control similar to that of the invention of claim 1 is performed. Therefore, the abnormal stop and the liquid compression due to the operation of the hydraulic pressure protection can be more reliably prevented, and the remarkable effect can be exhibited.

According to the invention of claim 4, in the invention of claim 2 or 3, the heating device is operated when the operation is restarted when the downtime of the refrigerating device is equal to or less than a predetermined lower limit value during the startup control. Since the compressor is started without using it, unnecessary operation of the heating device can be avoided,
The comfort of air conditioning can be improved.

According to the invention of claim 5, in the invention of claim 1 or 3, when a hydraulic pressure abnormality is detected after a lapse of a fixed time after the compressor is restarted, the refrigeration system is abnormally stopped. With this configuration, it is possible to reliably prevent the deterioration of the reliability due to the failure of the hydraulic system by distinguishing the hydraulic abnormality due to the failure of the hydraulic system from the hydraulic failure due to the "sleeping" of the refrigerant.

According to the sixth aspect of the present invention, when the refrigeration system is restarted after being stopped, when the operation start command is received, the compressor is stopped until the temperature difference between the oil temperature and the outside air temperature becomes a certain value or more. Since the compressor is started after operating the heating device in this state, it is possible to prevent the comfort of air conditioning from being deteriorated due to an excessive operating time of the heating device.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an invention according to claims 1 to 5.

FIG. 2 is a refrigerant piping system diagram of the air conditioning apparatus according to the embodiment.

FIG. 3 is an electric circuit diagram of the air conditioner according to the embodiment.

FIG. 4 is a flowchart showing the contents of restart control in the first embodiment.

FIG. 5 is a flowchart showing the contents of activation control in the second embodiment.

FIG. 6 is a diagram showing the configuration of the invention of claim 6;

FIG. 7 is a flowchart showing the contents of activation control in the third embodiment.

[Explanation of symbols]

 1 Compressor 51 Restart Control Means 52 Startup Control Means 53 Abnormal Stop Means 54 Standby Control Means 63QL Differential Pressure Switch (Hydraulic Pressure Abnormality Detection Means) CH Crankcase (Heating Device) Tm4 Pause Timer (Pause Time Clock Means) Tha Outside Air Temperature Sensor (Outside air temperature detection means) LP low pressure sensor (oil temperature detection means)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Okada 1304 Kanaoka-machi, Sakai City, Osaka Daikin Industry Co., Ltd.Kanaoka Plant, Sakai Factory (72) Naoki Ueno 1304, Kanaoka-machi, Sakai City, Osaka Daikin Industry Co., Ltd. Sakai Plant Kanaoka Plant (72) Inventor Hiroshi Asazuma 1304 Kanaoka Town, Sakai City, Osaka Daikin Industries, Ltd. Sakai Plant Kanaoka Plant

Claims (6)

[Claims] 1. A compressor (1) provided in a refrigerant circuit (14), a heating device (CH) for heating the lubricating oil of the compressor (1), and the pressure of the lubricating oil is a predetermined pressure. In a refrigerating apparatus equipped with a hydraulic pressure abnormality detection means (63QL) for detecting when the following occurs, the output of the hydraulic pressure abnormality detection means (63QL) is received until a certain time has elapsed after the compressor (1) was started. At this time, a restart control means (51) for controlling the compressor (1) to be restarted after forcibly stopping the compressor (1) and operating the heating device (CH) for a set time. A start-up control device for a refrigerating device, comprising: 2. A compressor (1) provided in a refrigerant circuit (14), a heating device (CH) for heating the lubricating oil of the compressor (1), and the pressure of the lubricating oil is a predetermined pressure. In a refrigerating apparatus provided with a hydraulic pressure abnormality detecting means (63QL) for detecting the following time, a rest time measuring means (Tm
4) and when the operation start command is received after the refrigeration system is stopped, the compressor (1) is stopped for a predetermined period of time corresponding to the refrigeration system down time measured by the down time measuring means (Tm4). After operating the above heating device (CH) while keeping
An activation control device for a refrigeration system, comprising: an activation control means (52) for controlling to activate the compressor (1). 3. The start-up control device for a refrigerating apparatus according to claim 2, wherein when the output of the hydraulic pressure abnormality detection means (63QL) is received by a certain time after the compressor (1) is started, it is forcibly forced. And a restart control means (51) for controlling to restart the compressor (1) after stopping the compressor (1) and operating the heating device (CH) for a set time. A start-up control device for a refrigerating device, which is characterized. 4. The start-up control device for a refrigerating apparatus according to claim 2 or 3, wherein the start-up control means (52) does not operate the heating device (CH) when the down time of the refrigerating apparatus is the lower limit value or less. , A start-up control device for a refrigeration system, which controls to start the compressor (1). 5. The refrigeration system start-up control device according to claim 1 or 3, wherein the restart control means (51) restarts the compressor (1) and, after a predetermined time has passed, the hydraulic pressure abnormality detection. A start-up control device for a refrigerating apparatus, comprising: an abnormal stop means (53) for controlling to abnormally stop the refrigerating apparatus when receiving the output of the means (63QL). 6. A compressor (1) provided in a refrigerant circuit (14), a heating device (CH) for heating the lubricating oil of the compressor (1), and the pressure of the lubricating oil is a predetermined pressure. In a refrigeration system equipped with a hydraulic pressure abnormality detection means (63QL) that detects when the following occurs and operates a protection device, the outside air temperature detection means (Tha) that detects the outside air temperature and the temperature of the lubricating oil of the compressor are Oil temperature detecting means (LP) for detecting
When the operation start command is received while the refrigeration system is at rest, the outside air temperature detecting means (T
outside temperature detected by ha) and the oil temperature detection means (L
After comparing the temperature of the lubricating oil detected in P), the heating device (CH) is operated until the temperature of the lubricating oil becomes higher than the ambient temperature by a certain value or more, and then the compressor (1) is started. And a standby control means (54) for controlling the start-up control device for the refrigerating apparatus.