JP2006194097A - Compressor and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor and an air conditioner capable of preventing a piston from being locked by a frozen material in a cylinder. <P>SOLUTION: In a compressor operation control part 18 of a control device 12, a piston 2 is stopped in a high temperature region HR in which the temperature is relatively high to resist generation of frost or ice on the inner peripheral surface of the cylinder 1. By so doing, no frozen material is generated between the high temperature region HR of the inner peripheral surface of the cylinder 1 and the piston 2 so as to prevent the piston from being locked by the frozen material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor and an air conditioner.

  Conventionally, as a compressor, a cylinder chamber formed in a cylinder is divided into a compression chamber and a suction chamber by an integrally formed piston and blade, and the blade is divided into two semi-cylindrical bushes. There is a swing type compressor in which a discharge port is opened in the compression chamber and a suction port is opened in the suction chamber (Japanese Patent Laid-Open No. 2004-124948: Patent Document 1).

  In this swing type compressor, the refrigerant gas is sucked into the suction chamber from the suction port by the swinging motion of the piston with the blade as a fulcrum, and the refrigerant gas is compressed in the compression chamber and discharged from the discharge port. It has become.

  By the way, in the conventional swing type compressor, it is known that the startability deteriorates when the outdoor temperature in winter is low. Also, it is known that the startability of the rotary compressor in which the piston and the blade are separated and the piston slides relative to the blade is deteriorated in winter.

  Conventionally, in this type of swing type compressor, it is considered that the startability deteriorates in winter due to an increase in the viscosity of the refrigerating machine oil or a so-called liquid compression in which the refrigerant liquid is compressed in the compressor. Measures have been taken to heat the compressor with a heater before the deterioration of startability occurs under conditions where the pressure is reduced or liquid compression occurs.

However, the present inventor has discovered that even if these measures are taken, the compressor has an unknown starting failure in winter. In particular, the compressor that caused this startup failure can not be found any abnormality even if it is taken to a service center and disassembled, and when it is installed again on site, it will start normally and the reproducibility of startup failure will be Was not recognized.
JP 2004-124948 A

  Accordingly, an object of the present invention is to provide a compressor capable of preventing the occurrence of a starting failure with unknown cause and low reproducibility.

  In order to investigate the cause of the above-mentioned starting failure of the compressor, the present inventor analyzed and estimated the starting failure occurrence mechanism as follows.

  First, the compressor was immediately disassembled when a startup failure occurred. That is, the compressor was disassembled immediately after starting failure on the spot without transporting the swing type compressor that caused startup unnecessary to the service center. Then, as shown in FIG. 1, it was discovered that the piston 2 was fixed to the cylinder 1 by the ice body 3 and the compressor could not rotate.

  And the driving | running state at the time of generation | occurrence | production of this starting failure was as follows. The air conditioner having this compressor was defrosted for several minutes, and the intake gas temperature of the compressor during this defrost operation was 0 to -30 ° C. After the defrosting operation, the heating operation was stopped for several tens of minutes to several hours, and then the compressor was restarted. On the other hand, even if the intake gas temperature of the compressor during the defrost operation is 0 to −30 ° C., after the defrost operation is completed, after the heating operation is stopped for several minutes, for example, for 3 minutes, the compressor starts without any problem. .

  On the other hand, in the state immediately before the end of the defrost operation, the temperature inside the compressor and the temperature of the indoor heat exchanger are the lowest, and both temperatures rise after the end of the defrost operation. However, the heating operation immediately after defrosting (after stopping for about several minutes) restarted without any problems, but when restarting after several tens of minutes after defrosting, starting failure due to icing occurred. This means that when the temperature immediately after the end of defrost is low, the start-up failure of the compressor does not occur, and when the temperature is high after several tens of minutes after the end of defrost, start-up failure occurs.

  This seems that ice bodies that are considered to be generated more at lower temperatures do not seem to be related to startup failure at first glance. However, the present inventor found that the moisture in the refrigerant gas frosted and frozen on the wall surface of the cylinder chamber of the compressor due to a decrease in the internal temperature of the compressor at the time of defrosting, and then a change with time (including an increase). As a result, it was thought that the frozen body grew inside the cylinder and increased in density, and the piston was fixed to the cylinder.

Specifically, the mechanism when frost and ice grow in the cylinder chamber and densify and harden was estimated as follows.
(I) In the cylinder chamber where the piston is rotating while defrosting down to -30 ° C, the water in the refrigerant gas is in the form of fine ice particles (like ice crystals that are the core of the snow) The fine ice particles partially adhere to the wall surface of the cylinder chamber and the outer surface of the piston. As shown in FIG. 2A, the adhering fine ice particles are pressed against the wall surface of the cylinder chamber of the cylinder 1 by the oscillating or rotating piston 2 to be crushed and solidified frost or ice layer. (Freeze) 3 is produced. This solid frost or ice layer 3 is a portion where the wall surface of the cylinder chamber 5 and the outer peripheral surface of the piston 2 are closest to each other, that is, some percent of the gap between the inner surface of the cylinder chamber and the piston at the contact point (several (μm to several tens of μm). However, no startup failure occurs at this stage.
(Ii) The solidified frost or ice layer 3 adhering to the metal surfaces of the low-temperature cylinder and piston lowered to −30 ° C. after the operation is stopped, as shown in FIG. It is supplied and further grows in the thickness direction (at this point, the gap between crystals is large).
(Iii) Thereafter, as shown in FIG. 2C, the surrounding water is supplied to the gaps of the grown frost or ice crystal 3, and the density of the frost or ice increases. However, at this point, the bonding strength between the frost or ice crystals 3 is not so strong. Therefore, in this state, the starting failure of the compressor does not occur.
(Iv) Furthermore, as the pressure in the cylinder chamber rises due to high and low pressure equalization in the refrigerant circuit after the operation is stopped, the saturation temperature of the refrigerant also rises. As a result, when the ambient temperature of the frost or ice rises, the tip of the frost or ice crystal (including the inside of the frost) melts and penetrates into the frost or ice, thereby further increasing the density of the frost. . When the ambient temperature is close to the melting point, the density is increased due to the frost sintering phenomenon. As a result, as shown in FIG. 2D, the frost or ice crystal 3 is finally densified and solidified, leading to poor start-up of the compressor.

  The present invention has been made on the basis of the analysis and estimation of the mechanism leading to the above-mentioned starting failure.

The compressor of this invention is
A cylinder chamber formed in the cylinder is divided into a compression chamber and a suction chamber by a piston and a blade, and a discharge port is opened in the compression chamber, and a compressor main body in which a suction port is opened in the suction chamber; ,
A motor for driving the piston;
An icing lock preventing means for preventing the piston from being locked by an icing body formed and grown between the inner surface of the cylinder chamber and the piston is provided.

  According to the above configuration, the icing lock preventing means can prevent the piston from being locked by an icing body generated and grown between the inner surface of the cylinder chamber and the piston.

In one embodiment,
The compressor is a swing type in which the piston and the blade are fixed integrally, and the piston swings.

  According to the above-described embodiment, even if the swing type compressor is such that one side of the piston always faces the low temperature side of the cylinder and is likely to be locked by icing, the icing lock preventing means locks the compressor body. Can be prevented.

In one embodiment,
The freeze lock prevention means is
Crystal growth inhibiting means for inhibiting the growth of frost or ice crystals generated in the cylinder chamber;

  According to the above-described embodiment, the crystal growth inhibition means can inhibit the growth of crystals of the frozen body and prevent the piston from being locked by the frozen bodies.

In one embodiment,
The crystal growth inhibition means is
After stopping the defrost operation of the air conditioner, after a predetermined time has elapsed, an operation stop state determination means for determining whether the operation of the compressor body is stopped,
When the operation stop state determining means determines that the operation of the compressor body is stopped, the compressor follow operation control means for controlling the motor to force the compressor body to operate for a predetermined time. Including.

  According to the embodiment, the operation stop state determination means determines whether or not the operation of the compressor main body is stopped after a predetermined time has elapsed after stopping the defrost operation of the air conditioner. In other words, the operation stop state determination means determines whether or not a condition is reached in which the frozen body grows and becomes locked. Then, the compressor follow operation control means, when the operation stop state determination means determines that the operation of the compressor body is stopped, that is, when it is determined that the condition leading to the lock due to icing is established, The motor is controlled such that the compressor body is forcibly operated for a predetermined time. Therefore, when conditions for freezing and solidification are established, the compressor is operated to inhibit freezing growth, while conditions for freezing and solidification are established. When not, the compressor can be prevented from operating.

The air conditioner of one embodiment
A refrigerant circuit in which the compressor, a four-way switching valve, an indoor heat exchanger, an expansion means, an outdoor heat exchanger, the four-way switching valve, and the compressor are sequentially connected;
While the compressor follow operation control means is following the compressor, the four way switching valve is controlled so as to perform heating operation, and at least the fan of the indoor heat exchanger is stopped. And air conditioner follow operation control means for controlling the fan.

  According to the embodiment, the four-way switching valve is set so that the air conditioner follow operation control means performs a heating operation while the compressor follow operation control means follows the compressor. The fan is controlled so that at least the fan of the indoor heat exchanger is stopped. Therefore, during the follow-up operation of the compressor, a high-temperature refrigerant gas can be supplied to the compressor main body to inhibit the growth of frozen bodies, and at least the fan of the indoor heat exchanger is stopped. It is possible to prevent the user from noticing that the user is following driving. In addition, you may control both said fans so that the fan of both the said indoor heat exchanger and an outdoor heat exchanger may be stopped by the said air conditioner follow operation control means.

In one embodiment,
The freeze lock prevention means is
Piston stop position control means for controlling the stop position of the piston so as to stop the piston in a high temperature region other than the low temperature region on the inner peripheral surface of the cylinder where frost or ice is likely to be generated.

  According to the above embodiment, the piston stop position control means stops the piston so as to stop the piston in a high temperature region other than the low temperature region on the inner peripheral surface of the cylinder where frost or ice is likely to be generated. Control the position. Therefore, frost or ice is not easily generated at the contact point between the piston and the cylinder, and the piston is prevented from being locked by iced bodies.

In one embodiment,
The high temperature region includes a region of an inner peripheral surface of the cylinder between the blade and the suction port, and a direction of 180 ° or more and 360 ° in the moving direction of the piston from the blade around the center of the cylinder chamber. And an area of the inner peripheral surface of the cylinder.

In one embodiment,
The high temperature region is a region of the inner peripheral surface of the cylinder that is 180 ° or more and 360 ° in the moving direction of the piston from the blade around the center of the cylinder chamber.

In one embodiment,
The low temperature region is a region of the inner peripheral surface of the cylinder between the suction port and a position 180 ° in the moving direction of the piston from the blade around the center of the cylinder chamber on the inner peripheral surface of the cylinder. And
The piston stop position control means stops the piston in the high temperature region so that a gap between the inner peripheral surface of the cylinder and the piston is 500 μm or more in the low temperature region.

  According to the above embodiment, the piston stop position control means causes the piston to move in the high temperature region so that the gap between the inner peripheral surface of the cylinder and the piston is 500 μm or more in the low temperature region. Since the operation is stopped, the piston and the cylinder are not easily locked by the frozen body in the low temperature region.

In one embodiment,
Provided is a stop command determination means for determining whether or not there is a stop command for stopping the operation of the compressor body during a defrost operation of the air conditioner or within a predetermined time after returning from the defrost operation to the heating operation. ,
The piston stop position control unit controls the stop position of the piston when the stop command determination unit determines that the stop command has been issued.

  According to the embodiment, the stop command determination unit stops the operation of the compressor body during a defrost operation of the air conditioner or within a predetermined time after returning from the defrost operation to the heating operation. It is determined whether or not a stop command has been issued. In other words, the stop command determining means determines whether or not a condition for growing the frozen body and locking is established. The piston stop position control means determines the piston stop position when the stop command determination means determines that the stop command has been issued, that is, when it is determined that a condition leading to lock by icing is established. Control. Therefore, when the conditions for the ice to grow and become firm are satisfied, the piston stop position is controlled, while when the conditions for the ice to grow and become firm are not met, the piston It is possible to prevent the stop position from being controlled.

In one embodiment,
The freeze lock prevention means is
A lock determination unit at start-up for determining whether the compressor body is locked at start-up;
The start-up lock determining means includes start-up power increasing means for increasing the power supplied to the motor when it is determined that the compressor body is locked.

  According to the above embodiment, when the start-up lock determining unit determines that the compressor body is locked, the start-up power increasing unit increases the power supplied to the motor to force the motor. Since it is driven, it is possible to prevent the piston from being locked due to iced bodies.

In one embodiment,
The freeze lock prevention means is
Furthermore, after the defrost operation of the air conditioner is stopped, after a predetermined time has elapsed, the operation stop state determination means for determining whether or not the operation of the compressor body is stopped,
The start-up lock determining means determines whether the compressor main body is locked at the time of restart when the operation stop state determining means determines that the operation of the compressor main body is stopped.

  According to the embodiment, the operation stop state determination means determines whether or not the operation of the compressor main body is stopped after a predetermined time has elapsed after stopping the defrost operation of the air conditioner. In other words, the operation stop state determination means determines whether or not a condition is reached in which the frozen body grows and becomes locked. When the start-up lock determination unit determines that the operation stop state determination unit determines that the operation of the compressor body is stopped, that is, determines that the condition for locking due to icing is satisfied, At startup, it is determined whether or not the compressor body is locked. Therefore, when the condition that the frozen body grows and becomes firm is satisfied, the power supplied to the motor can be increased by the start power increasing means based on the determination by the start time lock determining means.

The compressor of one embodiment is
An overcurrent protection device for preventing overcurrent of the motor;
The starting power increasing means boosts the voltage applied to the motor until the overcurrent protection device is activated when the starting lock determining means determines that the compressor body is locked, and After the motor is stopped by the operation of the current protection device, the start-up lock discriminating means further increases the voltage applied to the motor to the operation voltage at which the overcurrent protection device is activated. Repeat until it is determined that the main unit is not locked.

In one embodiment,
The starting power increasing means presets a boost voltage set in advance to the motor that is higher than a set voltage at normal starting when the starting lock determining means determines that the compressor body is locked. The operation for applying the holding time is repeated until the start-up lock determining means determines that the compressor body is not locked.

The compressor of one embodiment is
An overcurrent protection device for preventing overcurrent of the motor;
The starting power increasing means boosts the voltage applied to the motor to the operating voltage at which the overcurrent protection device operates when the starting lock determining means determines that the compressor body is locked. After the operation of 1 is performed, the voltage applied to the motor is boosted again, and when the start-up lock determination unit determines that the compressor body is locked, the motor is set to the normal start-up. The start-up lock discriminating means locks the compressor main body during the second operation of applying a preset boosted voltage that is higher than the voltage and lower than the operating voltage to the motor for a preset holding time. Repeat until it is determined that it is not.

In one embodiment,
The starting power increasing means increases the boosted voltage as the operation is repeated.

The compressor of one embodiment is
An overcurrent protection device for preventing overcurrent of the motor;
The starting power increasing means repeats the above operation until the overcurrent protection device is activated.

In one embodiment,
The starting power increasing means continues to apply a preset boost voltage higher than the set voltage at the normal starting to the motor when the starting lock determining means determines that the compressor body is locked. The start-up lock determination means repeats the determination of the piston lock at a predetermined time interval, the start-up power increase means applies the boosted voltage, the start-up lock determination means, the compressor main body Continue until it is determined that it is not locked.

The compressor of one embodiment is
An overcurrent protection device for preventing overcurrent of the motor;
The starting power increasing means boosts the voltage applied to the motor, and when the starting lock determining means determines that the compressor body is locked, the overcurrent protection device is activated to The voltage applied to the motor is boosted up to the operating voltage at which energization stops, and then again,
The starting power increasing means is configured such that when the starting lock determining means determines that the compressor body is locked, the motor has a higher voltage than the normal starting voltage and lower than the operating voltage. The application of the boost voltage set in advance is continued, the start-up lock determination means repeats the piston lock determination at a predetermined time interval, and the start-up power increasing means is configured to apply the boost voltage to the start-up lock. The determination means continues until it determines that the compressor body is not locked.

The compressor of one embodiment is
An overcurrent protection device for preventing overcurrent of the motor;
The start-up power increasing means applies a preset boost voltage higher than a set voltage at normal start-up to the motor when the start-up lock determining means determines that the compressor body is locked. At the same time, every time the start-up lock determination means repeats the determination of the lock of the compressor body at a predetermined time interval, the start-up lock determination means performs an operation of increasing the boost voltage stepwise. The process is repeated until it is determined that the machine body is not locked or until the overcurrent protection device is activated and the motor is de-energized.

In one embodiment,
The freeze lock prevention means is
A lock determination unit at start-up for determining whether the compressor body is locked at start-up;
The start-up lock determining means includes heat generation current control means for controlling a current to the motor to generate heat from the motor when it is determined that the compressor body is locked.

  According to the embodiment, when the start-up lock determination unit determines that the compressor main body is locked, the heat generation current control unit generates heat from the motor. To control the current. Therefore, it is possible to prevent the piston from being locked due to iced bodies.

In one embodiment,
The freeze lock prevention means is
Furthermore, after the defrost operation of the air conditioner is stopped, after a predetermined time has elapsed, the operation stop state determination means for determining whether or not the operation of the compressor body is stopped,
The start-up lock determining means determines whether the compressor main body is locked at the time of restart when the operation stop state determining means determines that the operation of the compressor main body is stopped.

  According to the embodiment, the operation stop state determination means determines whether or not the operation of the compressor main body is stopped after a predetermined time has elapsed after stopping the defrost operation of the air conditioner. In other words, the operation stop state determination means determines whether or not a condition is reached in which the frozen body grows and becomes locked. When the start-up lock determination unit determines that the operation stop state determination unit determines that the operation of the compressor body is stopped, that is, determines that the condition for locking due to icing is satisfied, At startup, it is determined whether or not the compressor body is locked. Therefore, when the condition that the frozen body grows and becomes firm is established, the current to the motor is controlled by the heat generation current control means based on the determination by the startup lock determination means.

In one embodiment,
The heat generation current control means is configured to apply a set voltage at the normal start to the motor for a preset holding time when the start-up lock determination means determines that the compressor body is locked. Is repeated until the start-up lock determining means determines that the compressor body is not locked.

In one embodiment,
The heat generation current control means continues the application of the set voltage at the normal start to the motor when the start lock determination means determines that the compressor body is locked, and the start lock The determination means repeats the determination of the lock of the compressor main body at a predetermined time interval, the heat generation current control means applies the set voltage, and the start-up lock determination means locks the compressor main body. Continue until it is determined that it is not.

In one embodiment,
The freeze lock prevention means is
A heater for heating the compressor body;
A lock determination unit at start-up for determining whether the compressor body is locked at start-up;
The start-up lock determining means includes heat generation current control means for controlling a current to the heater to generate heat from the heater when it is determined that the compressor body is locked.

  According to the embodiment, when the start-up lock determination unit determines that the compressor main body is locked, the heat generation current control unit supplies the heat to the heater so that heat is generated from the heater. To control the current. Therefore, it is possible to prevent the piston from being locked due to iced bodies.

In one embodiment,
The freeze lock prevention means is
Furthermore, after the defrost operation of the air conditioner is stopped, after a predetermined time has elapsed, the operation stop state determination means for determining whether or not the operation of the compressor body is stopped,
The start-up lock determining means determines whether the compressor main body is locked at the time of restart when the operation stop state determining means determines that the operation of the compressor main body is stopped.

  Since the compressor according to the present invention includes the icing lock preventing means, it is possible to prevent the piston from being locked by the icing body after the defrost operation.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 3 is a block diagram of the air conditioner according to the first embodiment, and FIG. 4 is a schematic diagram of a compression unit of the compressor.

  As shown in FIG. 3, the air conditioner includes a compressor 11, a four-way switching valve 12, an indoor heat exchanger 13, an expansion valve 14 as an example of an expansion means, an outdoor heat exchanger 15, The four-way switching valve 12 and the compressor 11 are sequentially connected in an annular manner to form a refrigerant circuit.

  During the heating operation, the flow path of the four-way switching valve 12 is in a solid line state, and the refrigerant flows in the direction indicated by the arrow W, while the four-way switching valve 12 is indicated by a broken line during the defrost operation. Switching to the state of the flow path, the refrigerant flows as shown by an arrow D, and performs reverse cycle defrost.

  The air conditioner controls the compressor 11, the four-way switching valve 12, the indoor fan 23 for the outdoor heat exchanger 13, the expansion valve 14, and the outdoor fan 25 for the outdoor heat exchanger 15. A device 20 is provided. The control device 20 includes a compressor operation control unit 18 and receives a signal for instructing operation or stop of the air conditioner from a remote controller 21.

  The compressor 11 is a swing type compressor. The compressor 11 includes a compressor main body 16 and a motor 17 that drives the compressor main body 16. As shown in FIG. 4, the compressor main body 16 includes a cylinder 1 that forms a cylinder chamber 5, a cylindrical piston 2 that is rotatably fitted to an eccentric portion 6 of a drive shaft, and a piston 2 that is integrated with the piston 2. A fixed blade 7, two semi-cylindrical bushes 8, 8 slidably sandwiching both sides of the blade 7, a suction port 9, and a discharge port 10 are provided. The integrally formed piston 2 and blade 7 partition the cylinder chamber 5 into a suction chamber 31 and a compression chamber 32. The reciprocating motion of the piston 2, that is, the swinging motion of the integral blade 7 and the piston 2, sucks the refrigerant gas from the suction port 9 into the suction chamber 31, and compresses and discharges the refrigerant gas in the compression chamber 32. It discharges from the port 10.

  The control device 20 includes a microcomputer (not shown) and has crystal growth inhibition means as an example of icing lock prevention means. This crystal growth inhibiting means is constituted by software as shown in FIG. The crystal growth inhibiting means is a part of the compressor operation control unit 18 and can be regarded as a part of the compressor 11.

  As shown in FIG. 5, the compressor 11 performs a heating operation (step S1), and then performs a defrost operation (step S2).

  Next, it is determined whether or not an operation stop command is output from the remote controller 21. If it is determined that an operation stop command is output, the operation of the motor 17 is stopped, while an operation stop command is output from the remote controller 21. If it is determined that the heating operation has not been performed, the operation returns to the heating operation (step S3, step S1).

  Further, in step S3, as the second determination, it is also determined whether or not the operation of the compressor body 16 is stopped after a predetermined time has elapsed, for example, after 5 minutes have elapsed, after the defrost operation has ended. However, the predetermined time may be selected from several minutes of 60 minutes or less depending on the specifications and conditions of the air conditioner. Whether or not this operation is stopped is determined based on whether or not a stop signal has already been transmitted from the remote controller 21 to the control device 20 five minutes ago. This step S3 is a state in which the operation stop state has continued for the predetermined time from the time the compressor is stopped during the defrost operation, or the compressor operation stop immediately after returning from the defrost operation to the heating operation (solid icing). It is an example of the driving | running | working stop state determination means for determining whether it is the conditions where a body is easy to be produced | generated. However, it may be determined that the operation is actually stopped because the motor 17 is not energized. Alternatively, a rotation sensor (not shown) determines that the compressor main body 16 has actually stopped operating because a signal indicating that the rotational position of the motor 17 or the compressor main body 16 has changed is not output. Also good.

  When the operation stop state determination means determines that the compressor main body 16 has stopped after a predetermined time has elapsed, for example, after 5 minutes have elapsed, after the defrost operation ends, the compressor main body 16 of the compressor 11 is forced to stop. Then, a drive current is supplied to the motor 17 under the control of the compressor operation control unit 18 so as to operate for a predetermined time (steps S3 and S4). That is, the compressor follow operation is performed. Step S4 is an example of the compressor follow operation control means. The control device 20 controls the switching of the four-way switching valve 12 to the heating operation side while the compressor operation control unit 18 performs the compressor follow-up operation, and the outdoor heat exchanger 15 The outdoor fan 25 and the indoor fan 23 are controlled so as to stop the fan 25 and the indoor fan 23 of the indoor heat exchanger 13 (step S4). In this way, the user is not made aware that he is following. This step S4 constitutes an example of an air conditioner follow operation control means. At this time, the expansion valve 14 is already in a large opening in order to equalize the pressure. Note that only the indoor fan 23 of the indoor heat exchanger 13 may be stopped without stopping the outdoor fan 25 of the outdoor heat exchanger 15. Even in this case, it is possible to prevent the user from noticing that the follow operation is being performed.

  Next, after the compressor follow operation and the air conditioner follow operation are continued for several minutes, the compressor follow operation and the air conditioner follow operation are stopped (step S5). By the compressor follow operation and the air conditioner follow operation, crystal growth of frost and ice (freeze) in the cylinder 1 is inhibited.

  As described above, after the compressor follow operation and the air conditioner follow operation are performed, when the operation is stopped and then restarted, the compressor 11 is locked, that is, the piston 2 is locked to the cylinder 1 by the iced body. It turns out that there is no.

  FIG. 6 shows the interior of the compressor with respect to the compressor of the first embodiment that performs the compressor follow operation and the air conditioner follow operation, and the conventional compressor that does not perform the compressor follow operation and the air conditioner follow operation. Specifically, FIG. 4 shows the temperature of the portion P45 of the cylinder 1 having a phase angle of 45 ° from the blade 7 to the revolution direction of the piston 2 around the center of the cylinder chamber 5 in FIG. In FIG. 6, the horizontal axis represents time, the vertical axis represents temperature (° C.), the curve I1 represents a change in the internal temperature of the compressor according to the first embodiment, and the curve PR represents the inside of the conventional compressor. Represents temperature change. From the curves I1 and PR, it can be seen that in the compressor of the first embodiment, the internal temperature is significantly increased compared to the conventional compressor, and the start-up failure due to freezing does not occur. In FIG. 6, in the section indicated by the arrow E immediately after the defrost operation, the expansion valve 14 is opened to perform pressure equalization between the high pressure side and the low pressure side of the refrigerant circuit.

  Further, according to the first embodiment, the operation stop state determination means (step S3) stops the operation of the compressor body 12 after a predetermined time has elapsed after stopping the defrost operation of the air conditioner. It is judged whether it is done. In other words, the operation stop state determination means determines whether or not a condition is reached in which the frozen body grows and becomes locked. Then, the compressor follow operation control means (step S4) determines that the operation stop state determination means (step S3) determines that the operation of the compressor main body 16 is stopped, that is, a condition that leads to a lock due to icing. If it is determined that is satisfied, the motor 12 is controlled so that the compressor body 16 is forcibly operated for a predetermined time. Therefore, when the condition that the frozen body grows and becomes strong is satisfied, the compressor 11 is operated to inhibit the growth of the frozen body, while the condition that the frozen body grows and becomes strong is satisfied. When not, the compressor 11 can be prevented from operating.

  In a swing type compressor, the piston and the blade are fixed integrally, and the piston oscillates so that one side of the piston always faces the low temperature side where the intake port of the cylinder is located. Thus, the piston is easily locked to the cylinder. However, in the first embodiment, since the crystal growth inhibition means, that is, the operation stop state determination means, the compressor follow operation control means and the air conditioner follow operation control means are provided, even if it is a swing type compressor, Locks due to icing can be reliably prevented.

  However, the rotary growth compressor in which the piston and the blade are separated and the piston rotates and revolves, the crystal growth inhibition means, that is, the operation stop state determination means, the compressor follow operation control means, and the air conditioner A follow operation control means may be provided to prevent the rotary compressor from being locked due to ice.

(Second Embodiment)
7 and 8 are diagrams for explaining the temperature distribution of the compressor body.

  In FIG. 7, the cylinder 1, piston 2, blade 7, suction port 9 and discharge port 10 have the same configuration as those of the first embodiment shown in FIG. Description is omitted.

  In FIG. 7, P45 represents a portion of the cylinder 1 having a phase angle of 45 ° around the center of the cylinder chamber 5 from the blade 7 to the revolving direction of the piston 2, and P180 represents from the blade 7 around the center of the cylinder chamber 5. A portion of the cylinder 1 having a phase angle of 180 ° in the revolution direction of the piston 2 is represented, and P270 is a portion of the cylinder 1 having a phase angle of 270 ° from the blade 7 to the revolution direction of the piston 2 around the center of the cylinder chamber 5. Represents.

  On the other hand, FIG. 8 shows the measured temperatures (° C.) of the above-mentioned parts P45, P180, and P270 of the compressor under the same conditions as when the compressor has failed to start, and the refrigerant gas G sucked from the suction port 9 Of temperature. In FIG. 8, curves P45, P180, and P270 indicate the time lapse of the measured temperatures (° C.) of the portions P45, P180, and P270, respectively (sequentially performing heating operation, stop, defrost operation, and stop). The curve G represents the change according to the passage of time of the temperature (° C.) of the refrigerant gas G sucked from the suction port 9.

  As can be seen from FIG. 8, at the time when the defrost operation is completed and the time when the compressor is stopped after this time, the temperatures of the parts P180 and P270 are much higher than the part P45. In FIG. 7, the refrigerant gas in the suction chamber 31 connected to the suction port 9 is low in temperature, while the refrigerant gas in the compression chamber 32 (see FIG. 4) connected to the discharge port 10 is hot due to adiabatic compression. Because.

  In FIG. 7, the low temperature region LR where frost or ice on the inner peripheral surface of the cylinder 1 is likely to be generated refers to the moving direction of the piston 2 from the blade 7 around the center of the suction port 9 and the cylinder chamber 5. It is the area | region of the internal peripheral surface of the cylinder 1 between a 180 degree location. On the other hand, the high temperature regions HR and MHR are regions where frost or ice on the inner peripheral surface of the cylinder 1 is difficult to be generated, and are regions other than the low temperature region LR. A region HR of the inner peripheral surface of the cylinder 1 that is 180 ° or more and 360 ° in the moving direction of the piston from the blade 7 around the center of the cylinder chamber 5 is a high temperature region HR having a relatively high temperature. The region of the inner peripheral surface of the cylinder 1 between the blade 7 and the suction port 9 is a high temperature region MR of a relatively low high temperature (intermediate high temperature).

  In the compressor according to the second embodiment, the piston 2 is stopped in a relatively high temperature region HR where the frost or ice hardly forms on the inner peripheral surface of the cylinder 1 by a piston stop position control means described later. By doing so, an iced body is not generated between the high temperature region HR on the inner peripheral surface of the cylinder 1 and the piston 2, and the piston 2 is prevented from being locked by the iced body.

  The piston stop position control means is configured by software as shown in FIG. In addition, since it is the same as FIG. 3 as a block diagram of the compressor of this 2nd Embodiment, FIG. 3 is used. The piston stop position control means is a part of the compressor operation control unit 18 shown in FIG.

  As shown in FIG. 9, the compressor 11 performs a heating operation (step S11), and then performs a defrost operation (step S12).

  Next, it is determined whether or not the stop of the operation of the compressor body 16 is instructed during the defrost operation of the air conditioner (step S13). Whether or not this operation is stopped is determined by whether or not a stop signal is transmitted from the remote controller 21 to the control device 20. This step S13 constitutes a stop command determination means.

  When it is determined that the operation stop command is not output from the remote controller 21, the operation returns to the heating operation (step S13, step S11).

  When the stop command determining means determines that an operation stop command has been output from the remote controller 21, the piston 2 of the compressor body 16 has a relatively high high temperature at which frost or ice on the inner peripheral surface of the cylinder 1 is difficult to generate. The high temperature region HR is stopped (step S14, step S15). Alternatively, once the piston 2 stops, if the stop position of the piston 2 is the low temperature region LR, the piston 2 is moved to the high temperature region HR. Steps S14 and S15 constitute an example of piston stop position control means.

  By doing so, ice formation is not generated between the high temperature region HR on the inner peripheral surface of the cylinder 1 and the piston 2, and the piston 2 is locked by the ice formation, thereby preventing the start-up failure. Can do.

  As a specific method for stopping the piston 2 in the high temperature region HR, for example, the rotation angle of the drive shaft of the piston 2 or the motor 17 is detected by a sensor, and the rotation angle detected by the sensor corresponds to the high temperature region HR. There is a method of feedback-controlling the stop position of the piston 2 so that the target rotation angle is achieved.

  In the second embodiment, the piston stop position control unit is operated when the stop command determination unit determines that there is a stop command during the defrost operation. The piston stop position control means may also be operated when a stop command is issued immediately after returning to the heating operation (for example, within 3 minutes) after the operation is completed. In this way, it is possible to prevent the piston 2 from being locked due to icing.

  In the second embodiment, the piston 2 is stopped in a relatively high high temperature region HR where frost or ice on the inner peripheral surface of the cylinder 1 is hard to be generated. The piston 2 is stopped in a relatively high high-temperature region HR and a relatively low high-temperature (intermediate high-temperature) high-temperature region MR other than the low-temperature region LR where frost or ice on the inner peripheral surface of the cylinder 1 is likely to be generated. You may make it make it. Even in this case, ice formation is less likely to occur between the intermediate high temperature region MR on the inner peripheral surface of the cylinder 1 and the piston 2 than in the low temperature region LR, and the region where the piston can be stopped is wider. Thus, control of the stop position becomes easy.

  In another modification, the piston stop position control means is operated unconditionally during the operation of the compressor, that is, when there is a stop command regardless of the defrost operation and the heating operation. This can prevent locks due to icing, and simplifies the control.

  FIG. 10 shows a flowchart of another modification. In FIG. 10, steps S11, S12, and S13 are the same as steps S11, S12, and S13 shown in FIG.

  If it is determined in step S13 that an operation stop command has been issued, the piston 2 is moved to the high temperature region HR, so that the clearance between the inner peripheral surface of the cylinder 1 and the piston 2 is 500 μm or more in the low temperature region LR. Stop at MR (steps S24, S14). Steps S24 and S14 constitute an example of piston stop position control means.

  By doing so, a gap of 500 μm or more is secured between the inner peripheral surface of the cylinder 1 and the piston 2 in the low temperature region LR where frost or ice is liable to adhere at low temperatures, so that it is possible to prevent start-up failure.

  In this modification as well, the piston stop position control means may be operated even when a stop command is issued immediately after the defrost operation ends and immediately after returning to the heating operation (for example, within 3 minutes).

(Third embodiment)
In the compressor according to the third embodiment, when a starting failure occurs during the heating operation and it is determined that the compressor is locked, the power supplied to the compressor at the time of starting is increased and the starting torque of the motor is increased. Thus, the startability is improved by increasing the start power.

  FIG. 11 is a block diagram of the compressor 71 according to the third embodiment. The same components as those of the compressor 11 of the first embodiment shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 11, the compressor 71 includes an overcurrent protection device (OCP) 67 and a control device 40 for preventing an overcurrent to the motor 17. The control device 40 constitutes an example of an icing lock prevention means, and includes a compressor operation control unit 18 and a startup lock determination unit 41. The icing lock prevention means is configured by software shown in FIG. 12, and includes an operation stop state determination means, a startup lock determination means, and a startup power increase means.

  As shown in FIG. 12, the compressor 71 performs a heating operation (step S1), and then performs a defrost operation (step S2).

  Next, it is determined whether or not an operation stop command is output from the remote controller 21. If it is determined that an operation stop command is output, the operation of the motor 17 is stopped, while an operation stop command is output from the remote controller 21. If it is determined that the heating operation has not been performed, the operation returns to the heating operation (step S3, step S1).

  Further, in step S3, as a second determination, it is also determined whether or not the operation of the compressor body 16 has been stopped after a predetermined time has elapsed, for example, after 5 minutes have elapsed, after the defrost operation has ended (step S3). ). However, the predetermined time may be selected from several minutes of 60 minutes or less depending on the specifications and conditions of the air conditioner. Whether or not this operation is stopped is determined by whether or not a stop signal has already been transmitted from the remote controller 21 to the control device 40 five minutes ago. This step S3 is a state in which the operation stop state continues for a predetermined time from the stop of the compressor during the defrost operation or the stop of the compressor immediately after returning from the defrost operation to the heating operation (a solid icing body is formed). This is an example of the operation stop state determination means for determining whether the condition is easy to be performed. However, since the motor 17 is not energized, it may be determined that the operation is actually stopped. Alternatively, a rotation sensor (not shown) may determine that the compressor body 16 has actually stopped operating because a signal indicating that the rotational position of the motor 17 or the compressor body 16 has changed is not output. It may be.

  After step S3, it is assumed that a restart command is issued to the compressor 71 by the remote controller 21 (step S44).

  Thereafter, it is determined whether or not the compressor body 16 has actually started (step S45). Whether or not it has been activated can be determined, for example, by detecting a change in the pressure of the refrigerant in the refrigerant circuit using a pressure sensor (not shown).

  If it is determined in step S45 that the compressor body 16 is activated, the process returns to the start, whereas if it is determined that the compressor body 16 is not activated, the process proceeds to step S46.

  In step S46, as shown in FIG. 13, it is determined whether or not the compressor main body 16 is locked in the step-up process to the set voltage Vsp when the compressor 71 is normally started. If it is determined that the compressor body 16 is not locked, the process proceeds to step S44, whereas if it is determined that the compressor body 16 is locked, the process proceeds to step S47. The determination of the lock of the compressor main body 16 is performed based on whether or not a signal indicating that the motor 17 or the compressor main body 16 is rotating can be detected while the motor 17 is energized. Specifically, for example, it is performed as follows. That is, in order to apply a harmonic voltage to the motor 17, an inverter (not shown) included in the compressor operation control unit 18 is controlled, a stop position is detected from the current locus, and the motor 17 is rotated by an electrical angle of 90 ° in the forward direction. Therefore, the inverter is controlled so that the motor 17 is DC-excited, the inverter is controlled again to apply a harmonic voltage to the motor 17, the stop position is detected from the current locus, and the first and second stop positions are detected. Whether or not the lock has occurred is determined based on whether or not the difference is equal to or less than a predetermined threshold value (for details, refer to Japanese Unexamined Patent Application Publication No. 2004-132282). In addition to this, as a method for determining the lock of the compressor, for example, a method described in JP 2000-197385 A may be used. Since various methods are known for determining the lock of the compressor, any method may be used. The step S46 constitutes an example of a startup lock determination unit.

  If the start-up lock determining means determines that the compressor body 16 is locked, the process proceeds to step S47, the start-up power supplied to the motor 17 is increased, and the process returns to step S46. This step S47 constitutes an example of a startup power increasing means for increasing the startup power to the motor 17.

  In step S47, the starting power is increased as shown in FIG. That is, when it is determined that the compressor body 16 is locked in the middle of boosting to the set voltage Vsp during normal startup in the application of voltage during startup (step S46), the startup power is gradually increased from the normal time, The pressure increase is continued until the overcurrent protection device (OCP) 67 is operated. After the motor 17 is stopped by the operation of the overcurrent protection device (OCP) 67, the operation command of the compressor is turned off for a predetermined time, and then again. The operation of starting the motor 17 is repeated until it is determined that the compressor body 16 is not locked, that is, until the compressor is determined to be unlocked (step S47). When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  As described above, the start-up power increasing means (step S47) is configured to detect the overcurrent protection when the start-up lock determining means (step S46) determines that the compressor body 16, that is, the motor 17 is locked. Until the device 67 is activated, the voltage applied to the motor 17 is increased, and after the motor is stopped by the operation of the overcurrent protection device 67, the activation is started again. Step S6) is repeated until it is determined that the compressor body 16 is not locked, that is, the compressor is unlocked.

  Thus, when the compressor main body 16 is locked, the instantaneous power supplied to the motor 17 is increased until the overcurrent protection device 67 is activated, and the operation for increasing the starting torque of the motor 17 is repeated many times. Therefore, even if the piston is fixed to the cylinder due to icing, the motor 17 can be reliably started, and start-up failure can be reliably prevented.

  Further, in the third embodiment, the voltage applied to the motor 17 is boosted until the overcurrent protection device 67 is activated. Therefore, the starting voltage is increased to the limit, and the starting torque of the motor 17 is increased. It can be increased to the limit. Therefore, it is possible to reliably prevent a start-up failure due to icing.

  In the third embodiment, when the operation of the compressor main body is stopped after a predetermined time has elapsed after the defrost operation of the air conditioner is stopped, the operation stop state determination means (step S3) is When the determination is made, that is, when there is a high possibility that a strong frozen body is generated, the start-up lock determining means (step S46) and the start-up power increasing means (step S47) are operated. The hour lock discriminating means (step S46) and the startup power increasing means (step S47) do not operate when they are unnecessary, and power is not consumed wastefully.

  However, the operation stop state determination means may be omitted.

  FIG. 14 is a graph showing a modification of the startup power increasing means. In this modification, when it is determined that the compressor main body 16 is locked during the voltage application to the motor 17 at the time of start-up to the set voltage Vsp at the time of normal start-up (step S46), the start-up power is increased from the normal time. In order to increase the voltage, the voltage is boosted to a preset boost voltage Vtup higher than the set voltage Vsp, and the boost voltage Vtup is maintained for a preset holding time Ttup.Then, the compressor operation command is turned off for a predetermined time, Thereafter, the operation of starting again is repeated unless the compressor main body 16 is locked, that is, until the compressor is determined to be unlocked. When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  The boost voltage Vtup set in advance higher than the set voltage Vsp is a voltage value suitable for high load torque.

  Thus, the starting power increasing means boosts the voltage applied to the motor 17, and when the starting lock determining means (step S46) determines that the compressor body is locked, the motor 17 is increased. In addition, the above-described startup lock determination is performed by applying a preset boost voltage Vtup higher than the set voltage Vsp at the time of normal startup for a preset holding time Ttup and then starting the operation after pausing for a predetermined time. The means (step S46) is repeated until it is determined that the compressor body is not locked.

  As described above, when the compressor main body 16 is locked, the operation of applying the boosted voltage Vtup to the motor 17 for a preset holding time Ttup is repeated many times until the compressor main body 16 determines that it is not locked. Therefore, even if the piston is fixed to the cylinder due to icing, the motor 17 can be reliably started, and start-up failure can be reliably prevented.

  FIG. 15 is a graph showing another modification of the starting power increasing means. In this modified example, when it is determined that the compressor main body 16 is locked in the middle of boosting to the set voltage Vsp during normal startup in the application of voltage during startup (step S46), the startup power is gradually increased from the normal time. Then, the pressure is continuously increased to the operating voltage Vocp at which the overcurrent protection device (OCP) 67 operates, and the operation of the overcurrent protection device (OCP) 67 stops the energization of the motor 17 and then the compressor is turned on for a predetermined time. A first operation is performed to turn off the operation command. Then, the operating voltage Vocp at the time of operation of the overcurrent protection device (OCP) 67 or a value substituted therefor is stored, and a value Vd for fine adjustment is subtracted from the operating voltage Vocp to obtain a boosted voltage Vocp ′ ( Vocp ′ = Vocp−Vd) is calculated and stored. This boosted voltage Vocp 'is a voltage higher than the set voltage Vsp at the normal startup.

  Next, in the voltage application at the time of starting, when it is determined that the compressor main body 16 is locked during the boosting to the set voltage Vsp at the time of normal starting (step S46), the above setting is performed in order to increase the starting power from the normal time. The voltage is boosted to a boosted voltage Vocp ′ that is higher than the voltage Vsp and lower than the operating voltage Vocp ′, and this boosted voltage Vocp ′ is maintained for a preset holding time Ttup. Thereafter, the second operation of starting again is repeated until the compressor body 16 is not locked, that is, until the compressor is determined to be unlocked. When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  Thus, the starting power increasing means boosts the voltage applied to the motor 17, and when the starting lock determining means determines that the compressor body is locked, the overcurrent protection device 67 The first operation of boosting the voltage applied to the motor to the operating voltage Vocp is performed until the motor stops operating, and then the voltage applied to the motor 17 is boosted again, so that the start-up lock determination means When (Step S46) determines that the compressor main body 16 is locked, the motor 17 has a preset boost voltage Vocp ′ that is higher than the set voltage Vsp at the time of normal start. The second operation for applying the time Ttup is repeated until the start-up lock determining means (step S46) determines that the compressor body 16 is not locked.

  As described above, when the compressor main body 16 is locked, after the first operation to increase the instantaneous power supplied to the motor 17 to the operating voltage Vocp at which the overcurrent protection device 67 operates, The compressor body 16 determines that the second operation of applying the preset boost voltage Vocp ′ higher than the set voltage Vsp for the preset holding time Ttup and then stopping the operation command of the compressor is unlocked. Thus, even if the piston is fixed to the cylinder due to icing, the motor 17 can be reliably started, and start-up failure can be reliably prevented.

FIG. 16 is a graph showing another modification of the startup power increasing means. In this modification, when it is determined that the compressor main body 16 is locked in the middle of boosting to the set voltage Vsp during normal startup in voltage application during startup (step S46), in order to increase startup power from the normal time, The voltage is boosted to a preset boost voltage Vtup higher than the set voltage Vsp, and this boost voltage Vtup is maintained for a preset hold time Ttup, for example, for a few seconds, and then the compressor operation command is turned off for a predetermined time. . At this time, if the overcurrent protection device 67 does not operate, the adjustment value Vd for fine adjustment of the boost voltage is added to the current boost voltage Vtup to obtain and store the next boost voltage Vtup ¹ + (Vtup ¹ + = Vtup + Vd).

Then, again, the voltage applied to the motor 17 is increased to the boost voltage Vtup ¹ + and lasted for the holding time Ttup, and then the operation command for turning off the compressor is performed for a predetermined time. At this time, the next boosted voltage Vtup ² + is calculated (Vtup ² + = Vtup ¹ + + Vd).

That is, as described below, the boosted voltage is increased stepwise and the restart is repeated.
Vtup ¹ + = Vtup + Vd
Vtup ² + = Vtup ¹ + + Vd
・ ・ ・ ・ ・ ・
Vtup ⁿ + = Vtup ^(n-1) + + Vd
n represents a natural number of 2 or more.

Now, the way that is raised toward the applied voltage of the motor 17 to boost the voltage Vtup ² +, the overcurrent protection device 67 is operated, a voltage obtained by subtracting the adjustment value Vd from the boosted voltage Vtup ² + Vtup ^- next time As a boosted voltage (Vtup ⁻ = Vtup ² + − Vd), start-up is performed again. And a series of operation | movement is repeated until it determines with the compressor main body 16 being non-locking. When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  As described above, the startup power increasing means sequentially increases the boost voltage applied to the motor 17 as the startup is repeated, and repeats the startup many times until the compressor body 16 determines that it is unlocked. Even if the piston is fixed to the cylinder due to the icing body, the motor 17 can be reliably started, and start-up failure can be reliably prevented.

  FIG. 17 is a graph showing a modification of the startup power increasing means. In this modification, when it is determined that the compressor main body 16 is locked during the voltage application to the motor 17 at the time of start-up to the set voltage Vsp at the time of normal start-up (step S46), the start-up power is increased from the normal time. In order to increase the voltage, the voltage is boosted to a preset boost voltage Vtup higher than the set voltage Vsp. The boosted voltage Vtup is maintained and the lock determination is repeatedly performed at a predetermined time interval between the lock determination and the lock determination that is set in advance, that is, the interval time Tr, so that the compressor body 16 is determined to be unlocked. Until this state continues. When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  In this way, the starting power increasing means causes the motor 17 to supply the motor 17 with a setting voltage Vsp during normal starting when the starting lock determining means (step S46) determines that the compressor body is locked. The application of a high preset boost voltage Vtup is continued, the start-up lock determination means (step S46) repeats the determination of the piston lock at a predetermined interval time, that is, the time interval, and the start-up power increase means The voltage application is continued until the start-up lock determining means (step S46) determines that the compressor body is not locked.

  Therefore, according to this modification, even if the piston is fixed to the cylinder due to the icing body, the motor 17 can be reliably started, and the starting failure can be reliably prevented.

  FIG. 18 is a graph showing a modification of the startup power increasing means. In this modified example, when it is determined that the compressor main body 16 is locked in the middle of boosting to the set voltage Vsp during normal startup in the application of voltage during startup (step S46), the startup power is gradually increased from the normal time. Then, the pressure is continuously increased to the operating voltage Vocp at which the overcurrent protection device (OCP) 67 operates, and the operation of the overcurrent protection device (OCP) 67 stops the energization of the motor 17 and then the compressor is turned on for a predetermined time. A first operation is performed to turn off the operation command. Then, the operating voltage Vocp at the time of operation of the overcurrent protection device (OCP) 67 or a value substituted therefor is stored, and a value Vd for fine adjustment is subtracted from the operating voltage Vocp to obtain a boosted voltage Vocp ′ ( Vocp ′ = Vocp−Vd) is calculated and stored. This boosted voltage Vocp 'is a voltage higher than the set voltage Vsp at the normal startup.

  Next, in the voltage application at the time of starting, when it is determined that the compressor main body 16 is locked during the boosting to the set voltage Vsp at the time of normal starting (step S46), the above setting is performed in order to increase the starting power from the normal time. The voltage is boosted to a boosted voltage Vocp ′ that is higher than the voltage Vsp and lower than the operating voltage Vocp. The boosted voltage Vocp ′ is maintained, and the lock determination is repeatedly performed at a preset time interval between the lock determination and the lock determination, that is, the interval time Tr, until the compressor body 16 is determined to be unlocked. This state is continued. When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  In this way, the starting power increasing means boosts the voltage applied to the motor 17, and when the starting lock determining means (step S46) determines that the compressor body 16 is locked, the excessive power is increased. The voltage applied to the motor 17 is stepped up until the current protection device 67 is activated and the energization to the motor 17 is stopped. After that, the start-up power increasing means is again set by the start-up lock determining means (step S46). When it is determined that the compressor main body 16 is locked, the motor 17 is continuously applied with a preset boost voltage Vocp ′ higher than the set voltage Vsp at the normal start-up, and the start-up lock determining means ( Step S46) repeats the determination of the lock of the compressor body 16 at a predetermined time interval Tr, and the start-up power increasing means determines the application of the boost voltage to the start-up lock determination. Stage (step S46) is, is to continue until the compressor body 16 is determined to not locked.

  Therefore, according to the starting power increasing means of this modification, even if the piston is fixed to the cylinder due to icing, the motor 17 can be started reliably and a starting failure can be reliably prevented.

FIG. 19 is a graph showing another modification of the startup power increasing means. In this modification, when it is determined that the compressor main body 16 is locked in the middle of boosting to the set voltage Vsp during normal startup in voltage application during startup (step S46), in order to increase startup power from the normal time, For example, a predetermined time Ttup operation of several seconds is performed at a preset boost voltage Vtup higher than the set voltage Vsp. If the overcurrent protection device 67 does not operate during this predetermined time Ttup, then the lock determination is performed again. If the compressor main body is determined to be locked, the adjustment value Vd for finely adjusting the boost voltage is set to the current value. The next boosted voltage Vtup ¹ + is obtained in addition to the boosted voltage Vtup, and the boosted voltage Vtup ¹ + is applied to the motor 17 for a predetermined time Ttup of several seconds. Furthermore, when the overcurrent protection device 67 is activated while the voltage is rising to the boost voltage Vtup ² + (Vtup ² + = Vtup ¹ + + Vd), the adjustment value Vd is subtracted from the previous boost voltage value Vtup ² +. voltage value Vtup ^- change the to boost voltage, then again subjected to activation, the compressor main body portion 16 repeats a series of operations until it is determined that the non-locking. When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

As described above, when the start-up lock determining unit (step S46) determines that the compressor main body 16 is locked, the start-up power increasing unit causes the motor 17 to apply the set voltage Vsp during normal start-up. Each time the startup lock determination means (step S46) repeats the determination of the lock of the compressor body 16 at a predetermined time interval, the higher boost voltages Vtup ¹ + and Vtup ² + are applied. The operation of increasing the boosted voltages Vtup ¹ + and Vtup ² + in a stepwise manner until the start-up lock determining means (step S46) determines that the compressor body 16 is not locked, or The process is repeated until the overcurrent protection device 67 is activated to stop the energization of the motor.

  Therefore, according to the starting power increasing means of this modification, even if the piston is fixed to the cylinder due to icing, the motor 17 can be started reliably and a starting failure can be reliably prevented.

(Fourth embodiment)
In the compressor according to the fourth embodiment, the piston and cylinder of the compressor main body are locked by the frozen body when the compressor main body is locked at the start-up after the compressor main body is stopped under a certain condition. Therefore, the current for heating is supplied to the motor, and the internal temperature of the compressor body is raised by the generated heat energy, so that the startability of the compressor body is improved.

  Since the block diagram of the compressor of this 4th Embodiment is the same as FIG. 11 of 3rd Embodiment, FIG. 11 is used. The software of this compressor is represented by the flowchart of FIG.

  In FIG. 20, steps S1, S2, S3, S44, S45, and S46 perform the same operations as those of the third embodiment shown in FIG. To do.

  The compressor of the fourth embodiment shown in FIG. 20 is different from the compressor of the third embodiment shown in FIG. 12 in that the motor 17 is locked when the compressor body 17 is locked instead of the starting power increasing means (step S47). The heat generation current control means (step S57) for controlling the current to the motor 17 (hereinafter referred to as a lock current) is provided in order to generate heat from the motor.

  The compressor of this 4th Embodiment is also provided with an icing lock prevention means similarly to the compressor of 3rd Embodiment. However, the freeze lock prevention means of the fourth embodiment is an operation stop state determination means (step for determining whether or not the operation of the compressor body is stopped after a predetermined time has elapsed after the defrost operation is stopped. S3), a start-time lock determining means (step S46) for determining whether or not the compressor main body 16 is locked at the time of start-up, and the start-up lock determining means (step S46). And heat generation current control means (step S57) for controlling a lock current to the motor 17 in order to generate heat from the motor 17 when it is determined that the motor 17 has been operated. The operation stop state determination means (step S3) and the start-time lock determination means (step S46) are the same as those of the compressor of the third embodiment, and thus description thereof is omitted.

The heat generation current control means (step S57) operates as shown in FIG. That is, in the voltage application to the motor 17 at the time of starting, when it is determined that the compressor main body 16 is locked during the boosting to the set voltage Vsp at the time of normal starting (step S46), the above setting is made only for a preset time Tt. An operation for generating a lock current is performed while maintaining the voltage Vsp. Then, after the compressor operation command is turned off for a predetermined time, the above operation is repeated again until the compressor body 16 is determined to be unlocked.
When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  Thus, when the compressor main body 16 is locked, the operation of flowing a lock current to the motor 17 in order to melt the iced body between the cylinder and the piston, the compressor main body 16 is unlocked. Since it repeats many times until it determines, even if the piston adheres to the cylinder due to icing, the motor 17 can be reliably started and start-up failure can be reliably prevented.

  FIG. 21 is a graph showing actually measured data when the energization of the lock current for 40 seconds to the motor is repeated 15 times at intervals of 3 minutes. FIG. 21 shows the relationship between the temperature of the coil of the motor 17, the temperature of the 45 ° portion in the moving direction of the piston from the cylinder blade of the compressor body 16, and the intake gas temperature, and the change over time.

  It can be seen from FIG. 21 that the temperature of the 45 ° portion of the cylinder is increased by the lock current.

  FIG. 23 is a graph showing a modification of the heat generation current control means (step S57). In this modification, in the voltage application to the motor 17 at the time of starting, when it is determined that the compressor body 16 is locked during the boosting to the setting voltage Vsp at the time of normal starting (step S46), the setting voltage Vsp is held. Continue to apply the lock current to the motor. Then, the lock determination is repeatedly performed at the preset interval time Tr between the lock determination and the lock determination, and this state is continued until it is determined that the compressor body 16 is not locked. When it is determined that the compressor main body 16 is not locked (step S46), the routine proceeds to normal activation control (step S44).

  Thus, the heat generation current control means (step S57) causes the motor 17 to normally start when the start-up lock determination means (step S46) determines that the compressor body 16 is locked. Application of the set voltage Vsp at the time is continued, the start-up lock determination means (step S46) repeats the determination of the piston lock at a predetermined interval time, that is, the time interval, and the start-up lock determination means (step S46). The process continues until it is determined that the compressor body is not locked.

  Therefore, according to this modification, even if the piston is fixed to the cylinder due to the icing body, the motor 17 can be reliably started, and the starting failure can be reliably prevented.

(Fifth embodiment)
In the compressor according to the fifth embodiment, when the compressor body is locked at the start-up after the compressor body is stopped under a certain condition, the piston and the cylinder of the compressor body are locked by iced bodies. In order to generate heat from the heater that heats the compressor body, a current is passed through the heater, and the internal temperature of the compressor body is raised by the heat generated from the heater to start the compressor body. It improves the performance.

  Although the compressor of the fifth embodiment is not shown, a heater for heating the compressor body 16 is added to FIG. 11 of the third embodiment, and therefore FIG. 11 is used.

  Further, the flowchart of the control of the compressor of the fifth embodiment is different from the flowchart of the compressor of the fourth embodiment shown in FIG. 20 in that the current control means for heat generation for controlling the lock current to the motor. Instead of (Step S57), when the compressor body 17 is locked, a heat generation current control means for controlling the current to the heater is provided to generate heat from the heater for heating the compressor body 16. The point is different. Since other points are the same, FIG. 20 is used for common steps.

  Similarly to the compressor of the fourth embodiment, the compressor of the fifth embodiment also includes icing lock prevention means. However, the freeze lock prevention means of the fifth embodiment is an operation stop state determination means (step for determining whether or not the operation of the compressor main body is stopped after a predetermined time has elapsed after the defrost operation is stopped. S3), a start-time lock determining means (step S46) for determining whether or not the compressor main body 16 is locked at the time of start-up, and the start-up lock determining means (step S46). And a heat generation current control means for controlling a current to the heater to generate heat from the heater when it is determined that the heat is generated. The operation stop state determination means (step S3) and the start-time lock determination means (step S46) are the same as those of the compressors of the third and fourth embodiments, and thus description thereof is omitted.

  According to the fifth embodiment, when the compressor body 16 is locked, an electric current is passed through the heater in order to melt the frozen body between the cylinder and the piston. Even if it is fixed, the motor 17 can be reliably started, and start-up failure can be reliably prevented.

  In the first to fifth embodiments, the oscillating compressor in which the piston and the blade are integrated has been described. However, the present invention can be applied to a rotary compressor that is separate from the piston and the blade and moves relative to the rotary compressor. It goes without saying that is also applicable.

  In the first embodiment, the icing lock prevention means includes crystal growth inhibition means. In the second embodiment, the icing lock prevention means includes piston stop position control means. In the third embodiment, In the fourth embodiment, the icing lock prevention means includes heat generation current control means for controlling the lock current to the motor. In the fifth embodiment, The freeze lock prevention means includes a heat generation current control means for controlling the current to the heater. In one compressor, the freeze lock prevention means includes the crystal growth inhibition means, the piston stop position control means, and the startup. It includes at least two of power increasing means, heat generation current control means for controlling the lock current to the motor, and heat generation current control means for controlling the current to the heater. Unishi may be. If it carries out like this, the lock | rock by an icing body can be prevented more reliably.

It is a perspective view explaining the state which the frozen body produced | generated. It is sectional drawing explaining the process in which frost or ice grows and densifies and solidifies. It is sectional drawing explaining the process in which frost or ice grows and densifies and solidifies. It is sectional drawing explaining the process in which frost or ice grows and densifies and solidifies. It is sectional drawing explaining the process in which frost or ice grows and densifies and solidifies. It is a block diagram of the compressor and air conditioner of a 1st embodiment. It is sectional drawing of the compressor of 1st Embodiment. It is a flowchart showing control of the compressor of the said 1st Embodiment. It is a graph showing the value which measured the temperature change inside the said compressor. It is sectional drawing showing the temperature distribution of the compressor of 2nd Embodiment. It is a graph showing the value which measured the temperature change of each site | part of the said compressor. It is a flowchart showing control of the compressor of the said 2nd Embodiment. It is a flowchart showing control of the modification of the said 2nd Embodiment. It is a block diagram of the compressor of a 3rd embodiment. It is a flowchart showing control of the compressor of the said 3rd Embodiment. It is a figure explaining operation | movement of a starting electric power increase means. It is a figure explaining operation | movement of the modification of a starting electric power increase means. It is a figure explaining operation | movement of the modification of a starting electric power increase means. It is a figure explaining operation | movement of the modification of a starting electric power increase means. It is a figure explaining operation | movement of the modification of a starting electric power increase means. It is a figure explaining operation | movement of the modification of a starting electric power increase means. It is a figure explaining operation | movement of the modification of a starting electric power increase means. It is a flowchart showing control of the compressor of 4th Embodiment. It is a graph showing the value which measured the temperature change inside the said compressor. It is a figure explaining operation | movement of the current control means of the said compressor. It is a figure explaining operation | movement of the modification of the said current control means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston 3 Freezing body 5 Cylinder chamber 7 Blade 9 Suction port 10 Discharge port 11, 71 Compressor 12 Four-way switching valve 13 Indoor heat exchanger 14 Expansion valve 15 Outdoor heat exchanger 16 Compressor body 17 Motor 18 Compressor Operation control unit 20, 40 Control device 31 Suction chamber 32 Compression chamber 41 Lock determination unit

Claims (26)

A cylinder chamber (5) formed in the cylinder (1) is divided into a compression chamber (32) and a suction chamber (31) by a piston (2) and a blade (7). The compression chamber (32) A compressor body (16) having a suction port (9) opened in the suction chamber (31), while a discharge port (10) is opened in
A motor (17) for driving the piston (2);
A compressor comprising: an ice lock prevention means for preventing the piston (2) from being locked by an ice formed and grown between the inner surface of the cylinder chamber (5) and the piston (2). The compressor according to claim 1,
The compressor characterized in that the piston (2) and the blade (7) are fixed integrally, and the piston (2) is of a swing type that swings. The compressor according to claim 1 or 2,
The freeze lock prevention means is
A compressor comprising crystal growth inhibition means for inhibiting growth of frost or ice crystals generated in the cylinder chamber (5). The compressor according to claim 3, wherein the crystal growth inhibiting means is
An operation stop state determination means for determining whether or not the operation of the compressor body (16) is stopped after a predetermined time has elapsed after stopping the defrost operation of the air conditioner;
When the operation stop state determining means determines that the operation of the compressor body (16) is stopped, the motor (17) is forced to operate the compressor body (16) for a predetermined time. And a compressor follow operation control means for controlling the compressor. The compressor according to claim 4, a four-way selector valve (12), an indoor heat exchanger (13), an expansion means (14), an outdoor heat exchanger (15), and the four-way selector valve ( 12) and a refrigerant circuit in which the compressor (11) is sequentially connected;
While the compressor follow operation control means is following the compressor, the four way switching valve (12) is controlled so as to perform heating operation, and at least the indoor heat exchanger (13) is controlled. And an air conditioner follow operation control means for controlling the fan (23) so as to stop the fan (23). The compressor according to claim 1 or 2,
The freeze lock prevention means is
Piston stop position for controlling the stop position of the piston (2) so that the piston (2) is stopped in a high temperature region other than the low temperature region of the inner peripheral surface of the cylinder (1) where frost or ice is likely to be generated. A compressor comprising control means. The compressor according to claim 6, wherein
The high temperature region includes the region of the inner peripheral surface of the cylinder (1) between the blade (7) and the suction port (9) and the blade (7) around the center of the cylinder chamber (5). A compressor characterized in that it is an area of the inner peripheral surface of the cylinder (1) that is 180 ° or more and up to 360 ° in the moving direction of the piston (2). The compressor according to claim 6, wherein
The high temperature region is around 180 ° or more in the moving direction of the piston (2) from the blade (7) around the center of the cylinder chamber (5) and up to 360 ° of the inner peripheral surface of the cylinder (1). A compressor characterized by being an area. The compressor according to claim 6, wherein
The low temperature region is formed in the moving direction of the piston (2) from the blade (7) around the center of the suction port (9) and the cylinder chamber (5) on the inner peripheral surface of the cylinder (1). The area of the inner peripheral surface of the cylinder (1) between the 180 ° points,
The piston stop position control means moves the piston (2) in the high temperature region so that the clearance between the inner peripheral surface of the cylinder (1) and the piston (2) is 500 μm or more in the low temperature region. Compressor characterized by being stopped at The compressor according to claim 6, wherein
Stop command determination for determining whether or not there has been a stop command for stopping the operation of the compressor body (16) during the defrost operation of the air conditioner or within a predetermined time after returning from the defrost operation to the heating operation. With means,
The compressor according to claim 1, wherein the piston stop position control means controls the stop position of the piston (2) when the stop command judging means judges that the stop command has been issued. The compressor according to claim 1 or 2,
The freeze lock prevention means is
A start-time lock determining means for determining whether or not the compressor body (16) is locked at the time of start-up;
The compressor characterized in that the starting lock determining means includes a starting power increasing means for increasing the power supplied to the motor (17) when it is determined that the compressor body (16) is locked. . The compressor according to claim 11, wherein
The freeze lock prevention means is
Furthermore, after stopping the defrost operation of the air conditioner, after a lapse of a predetermined time, provided with an operation stop state determination means for determining whether the operation of the compressor body (16) is stopped,
Whether the compressor main body (16) is locked or not at the time of restart when the operation stop state determining means determines that the operation of the compressor main body (16) has been stopped. The compressor characterized by judging. The compressor according to claim 11, wherein
An overcurrent protection device (67) for preventing overcurrent of the motor (17);
The starting power increasing means is arranged such that when the starting lock determining means determines that the compressor body (16) is locked, the motor (17) is operated until the overcurrent protection device (67) is activated. After the voltage applied is boosted and the motor (17) is stopped by the operation of the overcurrent protection device (67), the voltage applied to the motor (17) is again activated by the overcurrent protection device (67). The compressor is characterized in that the operation of boosting up to the operating voltage is repeated until the start-up lock determining means determines that the compressor body (16) is not locked. The compressor according to claim 11, wherein
The starting power increasing means sets the motor (17) in advance higher than the set voltage at the normal starting time when the starting lock determining means determines that the compressor body (16) is locked. A compressor characterized by repeating the operation of applying a boosted voltage for a preset holding time until the start-up lock determination means determines that the compressor body (16) is not locked. The compressor according to claim 11, wherein
An overcurrent protection device (67) for preventing overcurrent of the motor (17);
The start-up power increasing means determines the voltage applied to the motor (17) when the start-up lock determination means determines that the compressor body (16) is locked, and the overcurrent protection device (67). The first operation of boosting to the operating voltage at which the compressor operates is performed, and then the voltage applied to the motor (17) is boosted again, and the start lock determination means locks the compressor body (16). Is applied to the motor (17) with a preset boost voltage that is higher than the set voltage during normal startup and lower than the operating voltage for a preset holding time. The compressor characterized in that the second operation is repeated until the start-up lock determination means determines that the compressor body (16) is not locked. The compressor according to claim 14, wherein
The compressor characterized in that the starting power increasing means increases the boosted voltage according to repetition of the operation. The compressor according to claim 16, wherein
An overcurrent protection device (67) for preventing overcurrent of the motor (17);
The compressor characterized in that the starting power increasing means repeats the above operation until the overcurrent protection device (67) is activated. The compressor according to claim 11, wherein
The starting power increasing means sets the motor (17) in advance higher than the set voltage at the normal starting time when the starting lock determining means determines that the compressor body (16) is locked. The application of the boosted voltage is continued, the start-up lock discriminating means repeats the determination of locking of the piston (2) at a predetermined time interval, and the start-up power increasing means applies the boosted voltage to the start-up lock. A compressor characterized in that the determination means continues until it is determined that the compressor body (16) is not locked. The compressor according to claim 11, wherein
An overcurrent protection device (67) for preventing overcurrent of the motor (17);
The starting power increasing means boosts the voltage applied to the motor (17), and when the starting lock determining means determines that the compressor body (16) is locked, the overcurrent protection device ( 67) is activated and the voltage applied to the motor (17) is increased to an operating voltage at which energization to the motor (17) is stopped, and then again,
The starting power increasing means is configured such that when the starting lock determining means determines that the compressor main body (16) is locked, the motor (17) has a higher voltage than a normal starting voltage, and The application of the preset boost voltage lower than the operating voltage is continued, the start-up lock determination means repeats the determination of the lock of the piston (2) at a predetermined time interval, and the start-up power increase means The compressor is characterized in that the voltage application is continued until the start-up lock determining means determines that the compressor body (16) is not locked. The compressor according to claim 11, wherein
An overcurrent protection device (67) for preventing overcurrent of the motor (17);
The starting power increasing means sets the motor (17) in advance higher than the set voltage at the normal starting time when the starting lock determining means determines that the compressor body (16) is locked. The step of increasing the boost voltage stepwise every time the start-up lock determination means repeats the determination of the lock of the compressor body (16) at a predetermined time interval while applying the boost voltage. Until the startup lock determination means determines that the compressor body (16) is not locked, or until the overcurrent protection device (67) is activated and the motor (17) is de-energized. A compressor characterized by repetition. The compressor according to claim 1 or 2,
The freeze lock prevention means is
A start-time lock determining means for determining whether or not the compressor body (16) is locked at the time of start-up;
When the start-up lock discriminating unit discriminates that the compressor body (16) is locked, the heat generation unit controls the current to the motor (17) to generate heat from the motor (17). And a current control means. The compressor according to claim 21,
The freeze lock prevention means is
Furthermore, after stopping the defrost operation of the air conditioner, after a lapse of a predetermined time, provided with an operation stop state determination means for determining whether the operation of the compressor body (16) is stopped,
Whether the compressor main body (16) is locked or not at the time of restart when the operation stop state determining means determines that the operation of the compressor main body (16) has been stopped. The compressor characterized by judging. The compressor according to claim 21,
The heat generation current control means presets a set voltage for normal starting in the motor (17) in advance when the starting lock determining means determines that the compressor body (16) is locked. A compressor characterized by repeating the operation of applying only the holding time until the start-up lock determining means determines that the compressor body (16) is not locked. The compressor according to claim 21,
The heat generation current control means continues to apply a set voltage during normal startup to the motor (17) when the startup lock determination means determines that the compressor body (16) is locked. The start-up lock determination means repeats the determination of the lock of the compressor body (16) at a predetermined time interval, and the heat generation current control means applies the set voltage to the start-up lock determination means. Is continued until it is determined that the compressor body (16) is not locked. The compressor according to claim 1 or 2,
The freeze lock prevention means is
A heater for heating the compressor body (16);
A start-time lock determining means for determining whether or not the compressor body (16) is locked at the time of start-up;
The start-up lock determining means includes heat generation current control means for controlling a current to the heater to generate heat from the heater when it is determined that the compressor body (16) is locked. A compressor characterized by that. The compressor according to claim 25,
The freeze lock prevention means is
Furthermore, after stopping the defrost operation of the air conditioner, after a lapse of a predetermined time, provided with an operation stop state determination means for determining whether the operation of the compressor body (16) is stopped,
Whether the compressor main body (16) is locked or not at the time of restart when the operation stop state determining means determines that the operation of the compressor main body (16) has been stopped. The compressor characterized by judging.

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