JP2010101582A - Refrigerator for transport - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator for a transport preventing an accident caused by overheating of a clutch shoe and belt cut etc. and continuing cooling operation as much as possible to protect cargo. <P>SOLUTION: The refrigerator 1 for transport includes driven side equipment such as a compressor 11, a power generator 13 and an air blower 10 driven by any of an engine 2 or an electric motor 6 directly or via a power transmission means. The refrigerator 1 for transport further includes a slip detection means 22 for detecting slippage of the power transmission means and a protective stop means 38 for issuing a warning when the slippage of the power transmission means detected by the slip detection means 22 exceeds a set value and performing protective stop of driving side equipment. The protective stop means 38 can perform return operation by an operation switch 39 when the protective stop is not continued at set frequency or more, and cannot perform the return operation by the operation switch 39 when the protective stop is continued at the set frequency or more. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transport refrigeration apparatus that is mounted on a refrigeration vehicle, a trailer or the like and cools the inside of a freezer.

  The sub-engine-type transport refrigeration system uses a sub-engine or an electric motor driven by a commercial power source as a drive source, and either directly or via power transmission means such as a clutch, a pulley, and a drive belt by either the sub-engine or the electric motor. Thus, power is transmitted to driven devices such as a compressor, a generator, and a blower, and the driven devices are driven. In the transport refrigeration apparatus having such a configuration, it is assumed that slip occurs in a power transmission system such as a clutch, a pulley, and a drive belt. This slipping is considered to be caused by abnormal wear of clutch shoes, pulleys, drive belts, etc., oil adhesion on the power transmission surface, and the like. However, there are no conventional transport refrigeration systems that take special measures against slippage in the power transmission system, and prevent accidents due to abnormal wear of the clutch shoes or belt breakage. The fact is that it depends on.

  On the other hand, in equipment equipped with an engine and its power is transmitted to driven equipment via a clutch, belt, etc., changes in engine speed when the clutch is engaged, heat generation of the clutch or belt, etc. are detected. Thus, there is proposed a technique for detecting the presence or absence of slippage in a power transmission system such as a clutch or a belt, and stopping the engine when slipping is detected (for example, Patent Documents 1 and 2). reference).

JP 2006-250436 A Japanese Patent No. 3599261

  In the transport refrigeration system, even if slippage occurs in the power transmission system such as the clutch and drive belt during operation, the driver has no way of knowing it, and if the operation continues as it is, the clutch overheats or the drive belt runs out. Etc. In particular, there is a danger that overheating of the clutch shoe may lead to a fire. In addition, the belt breakage of the drive belt may damage or damage peripheral devices. For this reason, it is desired to prevent accidents caused by overheating of the clutch shoe, running out of the belt, and the like.

  On the other hand, by adopting the techniques disclosed in Patent Documents 1 and 2, it is possible to detect slippage in the power transmission system and stop the engine to be protected, thereby eliminating the possibility of an accident as described above. It becomes possible. However, in the transport refrigeration apparatus, if the engine is kept in a protective stop state, the temperature of the load loaded in the freezer cannot be controlled, and the load is damaged, causing a great deal of damage. Accordingly, there is a need for a transport refrigeration apparatus that can continue the cooling operation as much as possible to protect the load while preventing the occurrence of accidents due to overheating of the clutch shoe, belt breakage, and the like.

  The present invention has been made in view of such circumstances, and it is possible to prevent accidents caused by overheating of the clutch shoe, belt breakage, etc., and to continue the cooling operation as much as possible to protect the load. An object of the present invention is to provide a transport refrigeration apparatus.

In order to solve the above problems, the transport refrigeration apparatus of the present invention employs the following means.
That is, the transport refrigeration apparatus according to the present invention uses an engine and / or an electric motor as a drive side device, and directly or via power transmission means such as a clutch, a pulley, and a drive belt by either the engine or the electric motor. In a transport refrigeration apparatus provided with driven devices such as a driven compressor, generator, and blower, slip detection means for detecting slippage of the power transmission means, and the power detected by the slip detection means When the slip of the transmission means is greater than or equal to a set value, it is provided with an alarm and a protection stop means for protecting and stopping the drive side device, and the protection stop means is operated if the protection stop is not continued for a set number of times. A return operation is enabled with the switch, and when the protective stop continues for more than the set number of times, the return operation with the operation switch is disabled. Characterized in that it is.

  According to the present invention, the slip detection means for detecting the slip of the power transmission means such as the clutch, the pulley and the drive belt, and the alarm is issued when the slip of the power transmission means detected by the slip detection means is greater than or equal to the set value. And a protective stop means for protecting and stopping the drive side equipment such as the engine and / or the electric motor, and the protective stop means is capable of returning by the operation switch if the protective stop is not continued for a set number of times, Since it is configured to disable the return operation by the operation switch when the protective stop continues for more than the set number of times, the slip detection means detects the slip of the power transmission means that transmits power from the driving side equipment to the driven side equipment However, when it is greater than or equal to the set value, an alarm is issued by the protection stop means, and the drive side device can be protected and stopped. As a result, inadequate power transmission means such as clutches, pulleys, and drive belts, that is, abnormal wear and overheating of clutch shoes, abnormal wear of pulleys and drive belts, belt breakage, etc. should be detected in advance and necessary measures taken. Is possible. Therefore, it is possible to prevent accidents such as breakage and damage of peripheral devices caused by the occurrence of fire due to overheating of the clutch shoe or the belt running out of the drive belt. In addition, even if the drive-side equipment stops protection, if it does not continue for more than the set number of times, it can be restored by the operation switch, so the refrigeration device will not immediately become inoperable, and after confirming the situation, The cooling operation can be continued by operating the operation switch to perform the return operation, and thus the load can be protected. Furthermore, if the protective stop continues for more than the set number of times, the clutch shoe is likely to overheat or run out of the belt. Therefore, the occurrence of the serious accident as described above can be surely prevented.

  Furthermore, in the transport refrigeration apparatus of the present invention, in the transport refrigeration apparatus, when the slip of the power transmission means detected by the slip detection means is less than the set value and greater than or equal to a second set value, an alarm is provided. And a protective operation means for continuing the operation by reducing the load power of the driven device.

  According to the present invention, when the slip of the power transmission means detected by the slip detection means is less than the set value and greater than or equal to the second set value, an alarm is issued and the load power of the driven device is reduced to operate. Because it is equipped with continuous protective driving means, it is possible to warn and alert in advance that slippage exceeding the second set value has occurred, even if there is no concern that the clutch shoe will overheat or the belt runs out immediately. it can. In this case, the protective driving means reduces the load power of the driven equipment such as the compressor and generator, and also switches from the start / stop mode to the continuous operation mode to suppress the transmission torque and torque fluctuation, and the power transmission means slips. The refrigeration system can be kept running with limited capacity so that it is possible to continue the cooling operation while giving priority to load protection while avoiding accidents such as clutch shoe overheating and belt breakage. It becomes possible.

  Furthermore, the transport refrigeration apparatus according to the present invention is the above transport refrigeration apparatus, wherein the slip detection means detects heat generated by slipping of the clutch, a heat detection means such as a thermistor, and the power of the clutch. First rotational speed difference detecting means for detecting slip from the rotational speed difference between the transmission side and the driven side, driven side rotational speed and engine rotational speed calculated from the power generation frequency of the electric motor driven and rotated via the clutch A second rotational speed difference detecting means for detecting slippage from the difference between the rotational speed of the driving side device and the rotational speed of the driving side device such as the rotational speed of the compressor and the engine rotational speed calculated from the discharge pressure pulsation frequency of the compressor; The third rotational speed difference detecting means for detecting the slippage of the power transmission system from the difference between them, the rotational speed of the rotating part of the driving pulley or the interlocking device and the driven pulley or the pulley 4th rotation speed difference detection means for detecting slip from the difference from the rotation speed of the driven device that is interlocked, the generator rotation speed calculated from the AC power generation frequency of the generator and the engine or the electric motor The fifth rotational speed difference detecting means for detecting slip from the difference from the rotational speed of the driving side device, such as the above, is calculated from the rotational speed of the driven side device driven by the electric motor driven by a commercial power source and the power frequency. It is characterized by comprising one or a plurality of sixth rotational speed difference detecting means for detecting slipping from the difference from the electric motor rotational speed.

  According to the present invention, the slip detection means is constituted by any one or a plurality of the above-described heat generation detection means and first to sixth rotation speed difference detection means, so that the drive side device changes to the driven side device. The slippage of the power transmission means for transmitting power can be detected succinctly and accurately as the temperature or the rotational speed difference by the heat generation detecting means, the first to sixth rotational speed difference detecting means, or the like. As a result, inadequate power transmission means such as clutches, pulleys, and drive belts, that is, abnormal wear and overheating of clutch shoes, abnormal wear of pulleys and drive belts, belt breakage, etc. are detected in advance and accidents are caused by taking countermeasures. Can be prevented in advance.

  Furthermore, in the transport refrigeration apparatus according to the present invention, in the transport refrigeration apparatus, the first rotation speed difference detection means is used as the slip detection means, and the detected value of the clutch is determined from the detection value of the first rotation speed difference detection means. Clutch sticking detection means for detecting the presence or absence of sticking is provided, and the clutch sticking detection means is configured to issue an alarm when the clutch sticking is detected, and to protect and stop the driving side device. And

  According to the present invention, the first rotation speed difference detection means is used as the slip detection means, and the clutch fixation detection means for detecting whether or not the clutch is fixed is detected from the detection value of the first rotation speed difference detection means. The means is configured to issue an alarm when the clutch is detected to be stuck, and to protect and stop the driving side device. Therefore, the first means detects slipping from the difference in rotational speed between the power transmission side and the driven side of the clutch. When it is detected from the detection value of the rotational speed difference detection means that the driven side is rotated immediately after the power transmission side of the clutch is rotated, the clutch fixation detection means determines that the clutch is fixed and issues an alarm. At the same time, the drive-side device can be protected and stopped. As a result, it is possible to detect not only the slippage of the clutch but also whether or not the clutch is stuck. Further, it is possible to prevent a failure of the clutch, a failure induction of other devices accompanying an abnormality, and the like.

  Furthermore, in the transport refrigeration apparatus of the present invention, in any one of the transport refrigeration apparatuses described above, the first rotation speed difference detection means is used as the rotation slip detection means, and the detection value of the first rotation speed difference detection means. A clutch connection rotational speed detection means for detecting the clutch connection rotational speed, wherein the clutch connection rotational speed detection means is configured such that when the difference between the clutch connection rotational speed and the set rotational speed is equal to or greater than a set value, It is determined to be abnormal, and an alarm is issued, and the driving side device is protected and stopped.

  According to the present invention, the first rotational speed difference detecting means is used as the rotational slip detecting means, and the clutch connected rotational speed detecting means for detecting the clutch connected rotational speed from the detection value of the first rotational speed difference detecting means is provided. The clutch engagement rotational speed detection means is configured to determine that the clutch is abnormal when the difference between the clutch engagement rotational speed and the set rotational speed is equal to or greater than a set value, and to issue a warning and to stop the driving side device in a protective manner. Therefore, the connection rotation speed when the clutch is connected is detected from the detected value of the first rotation speed difference detecting means for detecting slip from the rotation speed difference between the power transmission side and the driven side of the clutch, and the connection rotation When the difference between the number of rotations and the preset number of rotations is greater than or equal to the set value, the clutch-connected rotation number detection means determines that the clutch is abnormal, issues an alarm, and protects the drive-side equipment. It can be. This makes it possible to detect not only clutch slippage detection but also clutch connection abnormality. In addition, it is possible to prevent the failure of other devices accompanying the clutch connection abnormality.

  According to the present invention, slip detection detects inadequate power transmission means such as clutches, pulleys, and drive belts, that is, abnormal wear and overheating of clutch shoes, or abnormal wear of pulleys and drive belts, belt breakage, etc. Since it is possible to take necessary measures, it is possible to prevent accidents such as breakage and damage of peripheral devices caused by the occurrence of fire due to overheating of the clutch shoe or the belt running out of the drive belt. In addition, even if the drive-side equipment stops protection, if it does not continue for more than the set number of times, it can be restored by the operation switch, so the refrigeration device will not immediately become inoperable, and after confirming the situation, The cooling operation can be continued by operating the operation switch to perform the return operation, and thus the load can be protected. Furthermore, if the protective stop continues for more than the set number of times, the clutch shoe is likely to overheat or run out of the belt. Therefore, the occurrence of the serious accident as described above can be surely prevented.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a schematic configuration diagram of a sub-engine type transport refrigeration apparatus, and FIG. 2 shows a configuration diagram of slip detection means of the power transmission system.
A sub-engine type transport refrigeration apparatus (refrigeration apparatus) 1 includes a sub-engine (engine) 2 as a drive source of the refrigeration apparatus and an electric motor 6 driven by electric power from a commercial power source 5. It is comprised so that it may drive.

  The output shaft 4 on the flywheel 3 side of the sub-engine 2 is provided with a centrifugal clutch (clutch) 8, and the rotating shaft 7 of the electric motor 6 is directly connected to the motor-side pulley 9 of the centrifugal clutch 8. A blower (propeller fan) 10 for a capacitor 16 to be described later is directly connected to the other end side of the rotating shaft 7 of the electric motor 6. A compressor 11 and a generator (alternator) 13 are disposed adjacent to the electric motor 6. A pulley 12 with an electromagnetic clutch and a driven pulley 14 are provided on the rotation shafts of the compressor 11 and the generator 13, respectively. It has been.

  A drive belt (ribbed belt) 15 is provided between the pulley with electromagnetic clutch (electromagnetic clutch) 12 and the driven pulley 14 and the motor-side pulley 9 of the centrifugal clutch 8. Thereby, when the sub engine 2 is driven, the compressor 11 and the generator 13 are driven by the sub engine 2 via the centrifugal clutch 8 (in this case, the electric motor 6 is idling), and the sub engine 2 is stopped. When the electric motor 6 is driven, it is driven by the electric motor 6.

  The compressor 11 and the condenser 16 are connected to an expansion valve 17 and an evaporator 18 provided inside the freezer via a refrigerant pipe 19 to constitute a refrigeration cycle as is well known. The air in the freezer is circulated through the evaporator 18 by the evaporator fan 20 and is cooled by heat exchange with the refrigerant. Furthermore, the refrigeration apparatus 1 is provided with a controller 21 for operation control.

  The controller 21 of the refrigeration apparatus 1 includes a centrifugal clutch 8 and a motor that transmit power from the sub-engine 2 or the electric motor 6 that is a drive-side device to the compressor 11, the generator 13, and the blower 10 that are driven devices. Slip detection means 22 is provided for detecting slippage (slip) generated by power transmission means such as the side pulley 9, the pulley 12 with electromagnetic clutch, the driven pulley 14, and the drive belt 15. As shown in FIG. 2, the slip detection means 22 includes one or more of a heat generation detection means 23 and first to sixth rotation speed difference detection means 24 to 29 having the following configuration. ing.

(1) A heat generation detecting means 23 comprising a thermostat or a thermistor 30 for detecting heat generated by slippage at the centrifugal clutch 8 and the pulley 12 with the electromagnetic clutch.
(2) The first rotation number for detecting the slippage of the centrifugal clutch 8 from the difference between the rotation speeds detected by the flywheel rotation sensor 31 and the motor-side pulley rotation sensor 32. Difference detection means 24.
(3) The driven side rotational speed calculated from the power generation frequency 33 of the electric motor 6 driven and rotated via the centrifugal clutch 8, and the engine rotational speed (drive side equipment rotational speed) detected by the flywheel rotational sensor 31. Second rotational speed difference detecting means 25 for detecting slippage from the rotational speed difference of

(4) A power transmission system based on a difference in rotational speed between the compressor rotational speed calculated from the discharge pressure pulsation frequency 34 of the compressor 11 and the engine rotational speed (drive-side apparatus rotational speed) detected by the flywheel rotational sensor 31. The third rotational speed difference detecting means 26 for detecting the slippage.
(5) The rotational speed of the rotating part of the motor-side pulley (drive-side pulley) 9 or the device (electric motor 6 or sub-engine 2) linked to the motor-side pulley 9 detected by the rotation sensors 32, 31; The slip is detected from the rotational speed difference between the pulley 12 with electromagnetic clutch and the driven pulley 14 detected by 36 or the rotational speed of the rotating device of the driven device such as the compressor 11 and the generator 13 linked to the pulley. 4 rotation speed difference detecting means 27;

(6) Speed difference between the generator speed calculated from the AC power generation frequency 37 of the generator 13 and the drive side equipment speed such as the sub-engine 2 or the electric motor 6 detected by the rotation sensors 31 and 32. 5th rotation speed difference detection means 28 for detecting slippage from
(7) The rotational speeds of the driven devices such as the compressor 11 and the generator 13 driven by the electric motor 6 driven by the commercial power source 5 are detected by the rotation sensors 35 and 36, and the rotational speed and the power frequency. Sixth rotational speed difference detecting means 29 for detecting slipping from the rotational speed difference from the rotational speed of the electric motor 6 calculated from

  Further, the controller 21 includes the centrifugal clutch 8 and the motor-side pulley detected by any one or a plurality of slip detection means 22 such as the heat generation detection means 23 and the first to sixth rotation speed difference detection means 29 described above. 9. When the slip of the power transmission means such as the pulley 12 with electromagnetic clutch, the driven pulley 14 and the drive belt 15 exceeds the set value, a warning is given by a buzzer or alarm notification or display on the display, etc. 2 or a protection stop means 38 for stopping protection of the electric motor 6. This protection stop means 38 enables the return operation by the operation switch 39 if the protection stop is not continued for a set number of times, for example, 3 times or more, and if the protection stop is continued for a set number of times, for example, 3 times or more, the operation is stopped. The return operation by the switch 39 is made impossible.

  In addition, the controller 21 issues a warning when the slip of the power transmission means detected by the slip detection means 22 is less than the above set value and greater than or equal to the second set value, and also the compressor 11 that is the driven device. And a protective operation means 40 for continuing the operation by reducing the load power of the generator 13. This protection operation means 40 is for allowing the cooling operation to continue even if the refrigeration capacity is lowered for load protection. As a method for this, the transmission torque is reduced in the power transmission system, and the clutch or drive is used. There are a method for suppressing the load torque so that the belt does not slip and a method for reducing the torque fluctuation so that the clutch and the driving belt do not slip.

  Specifically, as the former method, the suction pressure adjusting valve or the expansion valve (not shown) is throttled to reduce the suction pressure, the power of the compressor 11 is reduced, the number of operating cylinders is reduced, and the like. A method of reducing the capacity and reducing the driving power can be considered. Similarly, a method of reducing the load on the generator 13 by reducing the number of operating fans (evaporator fan 20 or condenser fan in the case of independent motor drive) driven by the power generated by the generator 13 can be considered. . Further, as the latter method, when the sub engine 2 or the electric motor 6 has selected a mode in which the operation is stopped in accordance with the thermo on / off (start / stop mode), a method of switching to the continuous operation mode is conceivable.

  Further, the controller 21 uses the slip detection means 22 to detect abnormalities such as the centrifugal clutch 8 and the electromagnetic clutch of the pulley 12 with the electromagnetic clutch. And a clutch connection rotation speed detecting means 42 for detecting the clutch rotation speed and checking whether there is an abnormality.

  The clutch adhering detection means 41 uses the first rotation speed difference detection means 24 and the fourth rotation speed difference detection means 27 as the slip detection means 22, and detects slip from the rotation speed difference between the power transmission side and the driven side of the clutch. Configuration in which it is determined that the clutch is fixed when it is detected from the detection values of the first or fourth rotational speed difference detecting means 24, 27 that the driven side is rotated immediately after the power transmission side of the clutch is rotated. It is said that. Further, when it is determined that the clutch is stuck (abnormal), the clutch sticking detection means 41 outputs an alarm via the protection stop means 38 and protects the driving side equipment such as the sub engine 2 or the electric motor 6. Is configured to stop. The functions such as the return operation by the protection stop means 38 are as described above.

  The clutch-connected rotation speed detection means 42 uses the first rotation speed difference detection means 24 as the slip detection means 22 and detects the slip from the rotation speed difference between the power transmission side and the driven side of the centrifugal clutch 8. The connection rotation speed of the centrifugal clutch 8 is detected from the detection value of the difference detection means 24, and when the difference between the connection rotation speed and the set rotation speed is equal to or greater than the set value, the clutch connection is determined to be abnormal. . Further, when the clutch engagement rotational speed detection means 42 determines that the centrifugal clutch 8 has an abnormality in the connection rotational speed and the centrifugal clutch 8 has an abnormality, the clutch connection rotational speed detection means 42 issues an alarm via the protection stop means 38 and the sub-engine 2. Alternatively, the driving side device such as the electric motor 6 is protected and stopped. The functions such as the return operation by the protection stop means 38 are as described above.

  Further, when the difference between the detected rotational speed of the centrifugal clutch 8 and the set rotational speed is less than the set value and greater than or equal to the second set value, the clutch connected speed detecting means 42 passes the protection stop means 38. Then, it may be configured such that the operation of the centrifugal clutch 8 can be continued as it is after warning the occurrence of an error in the rotational speed of the centrifugal clutch 8 by flashing an alarm, displaying an error on the display, etc. and calling attention in advance.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The transport refrigeration apparatus 1 drives the sub-engine 2 during normal operation and is operated using the sub-engine 2 as a drive source. That is, the rotational power from the sub-engine 2 is transmitted to the electric motor 6 (in this case, the electric motor 6 is idling) via the centrifugal clutch 8, and the condenser fan 10 is driven via the rotary shaft 7. Further, the motor-side pulley 9 is transmitted to the pulley 12 with electromagnetic clutch and the driven pulley 14 through the driving belt 15, and the compressor 11 and the generator 13 are driven. The refrigerant compressed by the compressor 11 circulates in the refrigeration cycle including the condenser 16, the expansion valve 17, the evaporator 18, the refrigerant pipe 19, and the like, and the air and heat in the freezer circulated by the evaporator fan 20 in the evaporator 18. Replaced and cools the air. Thereby, the inside of the freezer is cooled.

  On the other hand, when the refrigeration apparatus 1 is operated with the refrigerated vehicle or trailer stopped and the traveling engine stopped, the sub-engine 2 is stopped and the electric motor 6 is driven by being connected to the commercial power source 5. For this reason, the refrigeration apparatus 1 is operated using the electric motor 6 as a drive source. Since the rotational power of the electric motor 6 is interrupted by the centrifugal clutch 8, it is not transmitted to the sub-engine 2 side, but is transmitted to the condenser blower 10 directly connected to the rotating shaft 7 and from the motor-side pulley 9. This is transmitted to the pulley 12 with electromagnetic clutch and the driven pulley 14 via the drive belt 15, thereby driving the compressor 11 and the generator 13. Therefore, the cooling operation can be performed in the same manner as described above.

  Long-term operation causes wear and the like in the power transmission means such as the clutch shoe of the centrifugal clutch 8, the pulley 9 on the motor side, the pulley 12 with the electromagnetic clutch, the driven pulley 14 and the drive belt 15, and causes the power transmission. There are cases where slip occurs in the system. Such slippage in the power transmission system may cause accidents such as the occurrence of a fire due to overheating of the clutch shoe or the damage or damage of peripheral devices due to the belt running out of the drive belt.

In the present embodiment, the power transmission system is provided with slip detection means 22 composed of one or more of the heat generation detection means 23 and the first to sixth rotation speed difference detection means 24 to 29, and the power transmission system. When the slippage of the power transmission system detected by the slip detection means 22 is greater than or equal to the set value, an alarm is issued by the protection stop means 38 and the sub-engine 2 and the electric motor 6 are driven. The protection of the side equipment is stopped.
Hereinafter, with reference to FIG. 3 to FIG. 8, detection of slip in the power transmission system and protection control when slip is detected will be described in detail.

[Sub engine drive]
As shown in FIG. 3, when the operation of the refrigeration apparatus 1 is started, rotation detection is started in step S1, and then the sub-engine 2 is started in step S2. When the sub-engine 2 is started, detection of rotation connected to the centrifugal clutch 8 is executed in step S3. The centrifugal clutch 8 is configured to be connected at a rotation speed of, for example, about 1400 rpm, and the clutch connection rotation speed detection means 42 checks whether or not the centrifugal clutch 8 is normally connected at this connection rotation speed. The normality and abnormality (failure) of the centrifugal clutch 8 can be detected. The detection of the rotation connected to the centrifugal clutch 8 is executed in detail according to the flow (subroutine) shown in FIG.

  Subsequently, in step S4, whether the centrifugal clutch 8 and the electromagnetic clutch of the pulley 12 with the electromagnetic clutch are fixed is detected. Whether or not the clutch is stuck is detected using the detection values of the first and fourth rotational speed difference detecting means 24 and 27 that detect slip from the rotational speed difference between the clutch power transmission side and the driven side, and the power transmission side of the clutch is rotated. Immediately after that, it is possible to detect whether or not the driven side is rotating by checking the clutch adhering detection means 41, whereby it is possible to determine whether the clutch is normal or abnormal (failure). The detection of whether or not the clutch is stuck is executed by a flow (subroutine) shown in detail in FIG.

  When the detection of whether or not the clutch is stuck is completed, the process proceeds to step S5. In step S5, temperature detection is performed for the centrifugal clutch 8 and the electromagnetic clutch of the pulley 12 with the electromagnetic clutch. The temperature of the clutch is detected from the temperature in the vicinity of the clutch detected by the heat generation detection means 23 such as a thermostat or thermistor 30, and the protection stop means 38 checks whether or not this temperature exceeds the set temperature. Thereby, it is possible to detect overheating of the clutch due to slipping of the clutch shoe. The temperature detection of the clutch is executed by a flow (subroutine) shown in detail in FIG.

  Subsequently, the process proceeds to step S6, and slip detection is executed. The slip detection is detected by checking with the protection stop means 38 whether or not the speed difference detected by the speed difference detecting means 24 to 29 or the like is equal to or larger than a set value. The slip detection is executed by a flow (subroutine) shown in detail in FIG. If slip detection is performed, it will transfer to step S7 and it will be determined whether the sub engine 2 is stopped. If “NO (operation)” is determined in step S7, the process returns to step S4, and the detections in steps S4 to S6 are repeated. If “YES (stop)” is determined, the process returns to step S1 and the same operation as described above is repeated.

[Commercial power supply (electric motor) drive]
In this case, as shown in FIG. 4, since the step S12 is energized to the electric motor 2 instead of starting the engine and the centrifugal clutch 8 is disengaged as compared with the case of sub-engine driving, Except for omitting the detection of the rotation connected to the centrifugal clutch 8 in step S3, the flow from step S11 to step S17 is the same as in the case of sub-engine driving.

Next, details of the detection of the rotation connected to the centrifugal clutch 8 in step S3 will be described based on the flowchart (subroutine) shown in FIG.
In step S31, the rotation of the centrifugal clutch 8 is detected by the first rotational speed difference detecting means 24, and the rotational speed of the power transmission side when the centrifugal clutch 8 is driven is detected as the rotational speed of the clutch. In step S32, this is compared with a first connection rotational speed (for example, 1400 rpm) preset in the clutch connection rotational speed detection means 42, and when the rotational speed difference is 30% or more, for example, the centrifugal clutch 8 It is determined that there is an abnormality (failure) in the connection. In this case, the process proceeds to step S33, where a warning is given by a buzzer, alarm lighting, or an error display on the display via the protection stop means 38, and the sub-engine 2 is temporarily stopped. On the other hand, if the rotational speed difference is less than 30% in step S32, the process proceeds to step S34.

  In step S34, it is further determined whether or not the above-described rotation speed difference is, for example, 10% or more and less than 30%. As a result, if the rotational speed difference is 10% or more and less than 30%, the process proceeds to step S35, and an error is occurring in the rotation connected to the centrifugal clutch 8 by flashing an alarm or displaying an error on the display. After warning and calling attention in advance, continue driving. If it is determined in step S34 that the rotational speed difference is less than 10%, the process proceeds to step S36, the rotation connected to the centrifugal clutch 8 is normal, and the operation is continued as it is.

  Further, when the protection of the sub-engine 2 is stopped in step S33, the process proceeds to step S37, and it is determined whether or not the above-described protection stop is performed three times, for example. If the result is “NO”, the process proceeds to step S38. Here, if the state of protection stop is confirmed and there is no particular problem, the cooling operation can be continued by operating the operation switch 39 from off to on to start the return operation. Further, as a result of continuing the cooling operation, the protection stop due to the abnormality detection is continued three times, and when it is determined “YES” in Step S37, the process proceeds to Step S39, and the operation switch 39 is returned by the operation from OFF to ON. Driving is considered impossible. To resume operation, it is necessary to open the service door of the refrigeration apparatus 1 and perform necessary inspections, and the return operation by the operation switch 39 is not possible until the opening / closing of the service door is detected by the operation of the limit switch. It is said.

Next, details of the detection of whether or not the clutch is stuck in steps S4 and S14 will be described based on the flowchart (subroutine) shown in FIG.
Detection of whether the centrifugal clutch 8 or the electromagnetic clutch of the pulley 12 with the electromagnetic clutch is stuck is first performed in step S41 by transmitting the clutch power detected by the first rotational speed difference detecting means 24 and the fourth rotational speed difference detecting means 27. The clutch sticking detection means 41 compares the rotation speed on the side and the rotation speed on the driven side.

  Based on the comparison result, in step S42, it is determined whether or not the driven side has been rotated immediately after the power transmission side of the clutch has been rotated, that is, whether or not the power transmission side and the driven side have been rotated in synchronization. If “YES”, the clutch sticking detection means 41 determines that the clutch is stuck and is abnormal. In this case, the process proceeds to step S43, where a warning is issued by a buzzer, alarm lighting, etc., or an error display on the display, etc., via the protective stop means 38, and a drive side device such as the sub engine 2 or the electric motor 6 is provided. Temporarily stop the protection. On the other hand, if “NO” is determined in the step S42, the process proceeds to a step S44, the clutch is made normal, and the operation is continued as it is.

  When the sub engine 2 or the electric motor 6 is protected and stopped in step S43, the process proceeds to step S45, and it is determined whether or not the protection stop is continued three times. The following is the same as steps S36 to S38 in the case of rotation detection with the clutch engaged. If the determination result is “NO”, the process proceeds to step S46, and if there is no particular problem, the operation switch 39 is operated from OFF to ON. Then, the cooling operation can be continued by starting the return operation. Further, as a result of continuing the cooling operation, the protection stop due to the abnormality detection is continued three times, and if “YES” is determined in Step S45, the process proceeds to Step S47, and the operation switch 39 is returned by the operation from OFF to ON. Driving is considered impossible. To resume operation, it is necessary to open the service door of the refrigeration apparatus 1 and perform necessary inspections, and the return operation by the operation switch 39 is not possible until the opening / closing of the service door is detected by the operation of the limit switch. It is said.

Next, details of the clutch temperature detection in steps S5 and S15 will be described based on the flowchart (subroutine) shown in FIG.
The temperature detection of the clutch is started in step S51 by detecting the temperature in the vicinity of the centrifugal clutch 8 or the electromagnetic clutch of the pulley 12 with the electromagnetic clutch by the heat generation detection means 23 such as the thermostat or thermistor 30. In step S52, the protection stop unit 38 compares the detected temperature from the heat generation detection unit 23 with a preset temperature (or thermostat operating temperature), and determines whether or not the detected temperature exceeds the set temperature. .

  If the determination result is “YES”, the protection stopping means 38 determines that the clutch shoe is overheated due to slipping. In this case, the process proceeds to step S53, where a warning is given by notification by a buzzer, alarm lighting, etc., or an error display on the display, and the driving side equipment such as the sub engine 2 or the electric motor 6 is temporarily stopped. On the other hand, if “NO”, the process proceeds to step S54, and the clutch is assumed to be normal because the clutch shoe is not overheated by slipping, and the operation is continued as it is.

  When the driving side device is stopped in step S53, the process proceeds to step S55, and it is determined whether or not the temperature is equal to or lower than the set temperature (or thermostat return temperature). If the result is “NO”, the process returns to step 54, and if “YES”, the process proceeds to step S56. In step S56, it is determined whether or not the protection stop due to overheating has continued three times. The following is the same as the case shown in FIGS. 5 and 6, and if the determination result is “NO”, the process proceeds to step S57, and if there is no particular problem, the operation switch 39 is operated from OFF to ON. The cooling operation can be continued by starting the return operation. As a result of continuing the cooling operation, the protection stop due to overheating is continued three times, and if “YES” is determined, the process proceeds to step S58, and the return operation by the operation of the operation switch 39 from OFF to ON is disabled. . The resumption of operation is based on the condition that the service door of the refrigeration apparatus 1 is opened and necessary inspections are performed, and the return operation by the operation switch 39 is impossible until the opening / closing of the service door is detected by the operation of the limit switch. Is done.

Further, details of the slip detection of the power transmission system in steps S6 and S16 will be described based on the flowchart (subroutine) shown in FIG.
The slip detection of the power transmission system is performed in step S61 by the power transmission side rotation and the driven side rotation of the power transmission system detected by one or more of the first to sixth rotation speed difference detecting means 24 to 29. And start by comparing. Based on the comparison result, in step S62, it is determined whether the rotational speed difference between the power transmission side rotation and the driven side rotation is, for example, 10% or more. If the rotational speed difference is 10% or more, it is determined that slip has occurred, so the process proceeds to step S63, where the protection stop means 38 notifies the user with a buzzer or alarm lighting, or displays an error on the display. Etc., and the drive side equipment such as the sub engine 2 or the electric motor 6 is temporarily stopped.

  On the other hand, when it is determined that the rotational speed difference is less than 10%, the process proceeds to step S64, and it is further determined whether or not the rotational speed difference is 5% or more and less than 10%. As a result, if the rotational speed difference is not less than 5% and less than 10%, it is determined that slip has started to occur, so the process proceeds to step S65, and an alarm is sent indicating that slip has started to occur in the power transmission system. Alert by flashing or displaying an error on the display, etc., and call attention in advance. In this case, the process proceeds to step S66, and the operation is continued by being switched to the protection operation mode via the protection operation means 40. If it is determined in step S64 that the rotational speed difference is less than 5%, the process proceeds to step S67, where no slip is generated in the power transmission system, and the operation is continued as it is.

  In the protective operation mode, even if the refrigeration capacity is lowered in order to reliably protect the load from a situation where the refrigeration apparatus 1 becomes inoperable due to an accident such as overheating of the clutch shoe due to slip in the power transmission system or belt breakage. This is an operation mode in which the cooling operation can be continued. In this case, the refrigeration apparatus 1 controls the load power of the compressor 11 and the generator 13 by reducing the suction pressure or controlling the capacity, or the sub engine 2 or the electric motor. The operation is continued by control for switching the operation 6 from the start / stop mode to the continuous operation mode. As a result, it is possible to continue the cooling operation while reliably avoiding overheating of the clutch shoe and belt breakage due to slip.

  In step S63, when the driving side device such as the sub-engine 2 or the electric motor 6 is protected and stopped, the process proceeds to step S68, and it is determined whether or not the protection stop by the slip detection is performed three times, for example. . The following is the same as the case shown in FIGS. 5 to 7. If the determination result is “NO”, the process proceeds to step S69. If there is no particular problem, the operation switch 39 is operated from OFF to ON. The cooling operation can be continued by starting the return operation. Further, as a result of continuing the cooling operation, the protection stop by the slip detection is continued three times, and if “YES” is determined, the process proceeds to step S70, and the return operation by the operation of the operation switch 39 from OFF to ON is impossible. It is said. The resumption of operation is based on the condition that the service door of the refrigeration apparatus 1 is opened and necessary inspections are performed, and the return operation by the operation switch 39 is impossible until the opening / closing of the service door is detected by the operation of the limit switch. Is done.

  As described above, according to the present embodiment, the slip of the power transmission means for transmitting power from the driving side devices such as the sub engine 2 and the electric motor 6 to the driven side devices such as the blower 10, the compressor 11, and the generator 13 is achieved. When detected by the slip detection means 22 such as the heat generation detection means 23 and the first to sixth rotation speed difference detection means 24 to 29 and the detected value is equal to or higher than a set value, an alarm is given by the protection stop means 38 and the sub engine 2 or Drive-side equipment such as the electric motor 6 can be protected and stopped. For this reason, when the slip is detected, the power transmission system such as the centrifugal clutch 8, the motor-side pulley 9, the pulley 12 with the electromagnetic clutch, the driven pulley 14 and the drive belt 15 is inappropriate, that is, the clutch shoe is abnormally worn or overheated, or the pulley and the drive. Abnormal wear of the belt, belt breakage, etc. can be detected in advance and necessary measures can be taken. Therefore, it is possible to prevent accidents such as breakage and damage of peripheral devices caused by the occurrence of fire due to overheating of the clutch shoe or the belt running out of the drive belt.

  In addition, even if the driving side devices such as the sub-engine 2 and the electric motor 6 are protected and stopped, if the operation is not continued for the set number of times, the operation switch 39 can perform the return operation. For this reason, the refrigeration apparatus 1 does not immediately become inoperable, and after confirming the situation, the cooling operation can be continued by operating the operation switch 39 to perform the return operation. This makes it possible to protect the load. Furthermore, if the protection stop due to slip detection continues for more than the set number of times, the clutch shoe is likely to overheat or run out of belt. In this case, open the service door of the refrigeration apparatus 1 and perform the necessary inspection. Unless the operation is performed, the return operation by the operation switch 39 is disabled, so that it is possible to reliably prevent the occurrence of the serious accident as described above.

  In addition, when the slip of the power transmission means detected by the slip detection means 22 is less than the set value and greater than or equal to the second set value, an alarm is issued and the compressor 11 and the generator 13 etc. are output by the protective operation means 40. Because the load power of the driven device is reduced and the operation of the refrigeration apparatus 1 is continued, even if there is no concern that the clutch shoe overheats or the belt runs out immediately, slippage of the second set value or more occurs. Can alert you in advance and call attention. Further, in this case, the protective driving means 40 reduces the load power of the driven device such as the compressor 11 and the generator 13 and switches to the continuous operation mode to suppress the transmission torque and torque fluctuation, so that the power transmission means does not slip. In this way, it is possible to continue the operation of the refrigeration system by suppressing the capacity, so that it is possible to continue the cooling operation while giving priority to the load protection while avoiding accidents due to overheating of the clutch shoe, belt breakage, etc. it can.

  Further, since the slip detection means 22 is composed of one or more of the heat generation detection means 23, the first to sixth rotation speed difference detection means 24 to 29, the sub engine 2, the electric motor 6, etc. Slip of the power transmission means for transmitting the power from the driving side equipment to the driven side equipment such as the blower 10, the compressor 11 and the generator 13, the heat generation detection means 23, the first to sixth rotation speed difference detection means 24 to 29, etc. As a result, it is possible to detect the difference in temperature or rotational speed simply and accurately. Therefore, inadequate power transmission means such as clutches, pulleys, and drive belts, that is, abnormal wear and overheating of clutch shoes, abnormal wear of pulleys and drive belts, belt breakage, etc. are detected in advance and measures are taken. It is possible to prevent the occurrence.

  Further, in the present embodiment, the first and fourth rotational speed difference detecting means 24, 27 are used as the slip detecting means 22, and whether or not the clutch is fixed is detected from the detection values of the first and fourth rotational speed difference detecting means 24, 27. Clutch sticking detection means 41 is provided, and when the clutch sticking detection means 41 detects that the driven side is rotated immediately after the power transmission side of the clutch is rotated and the driven side is rotating synchronously, the clutch is fixed. It is determined that there is an alarm, and an alarm is issued and the drive side equipment is protected and stopped. For this reason, it is possible to detect not only the slip detection of the clutch but also the presence or absence of the clutch. Further, it is possible to prevent a failure of the clutch, a failure induction of other devices accompanying an abnormality, and the like.

  Similarly, a clutch engagement rotational speed detection means 42 is provided, and the centrifugal clutch 8 is connected based on the detection value of the first rotational speed difference detection means 24 that detects slip from the rotational speed difference between the power transmission side and the driven side of the centrifugal clutch 8. When the difference between the connection rotation speed and the preset rotation speed is equal to or greater than the set value, the clutch rotation speed detection means 42 causes an abnormality in the connection rotation speed of the centrifugal clutch 8. Is determined, an alarm is issued, and the protection of the sub-engine 2 is stopped. For this reason, not only the detection of the slip of the centrifugal clutch 8 but also the abnormality of the connected rotation speed of the centrifugal clutch 8 can be detected. In addition, it is possible to prevent the failure of other devices accompanying the abnormality of the centrifugal clutch 8.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment differs from the first embodiment described above in the configuration of the refrigeration apparatus. Since other points are the same as those in the first embodiment, description thereof will be omitted.
[First example]
FIG. 9 shows a configuration diagram of the refrigeration apparatus 51 according to the first example of the present embodiment.
In this example, the rotary shaft 57 of the compressor 56 is directly connected to the driven pulley 55 of the centrifugal clutch 54 provided on the output shaft 53 of the sub-engine 52.

  An electric motor 60 is connected to the driven pulley 55 via a drive belt 58 and a driven pulley 59. The electric motor 60 can be driven by a commercial power source 61. The rotational power of the electric motor 60 is configured to be transmitted to a generator (alternator) 69 via a pulley 62, a belt 63, a counter shaft 66 having pulleys 64, 65, a belt 67, and a pulley 68. Further, the belt 67 is installed on a pulley 71 provided on the blower drive shaft 70 so that rotational power can be transmitted to the condenser fan 72 and the evaporator fan 73 via the blower drive shaft 70.

  The compressor 56, the condenser 74, the expansion valve 75, the evaporator 76, and the refrigerant pipe 77 constitute a refrigeration cycle. The condenser fan 72 is capable of circulating outside air to the condenser 74, and the evaporator. The fan 73 is disposed so that the air in the freezer can be circulated with respect to the evaporator 76. The refrigeration apparatus 51 is provided with a controller 78 for operation control.

  The refrigeration apparatus 51 can drive the compressor 56 from the sub engine 52 via the centrifugal clutch 54 when driven by the sub engine 52. The generator 69 is driven from the driven pulley 55 via the drive belt 58, pulley 59, electric motor 60 (idling), pulley 62, belt 63, counter shaft 66, belt 67 and pulley 68, and the belt 67 The condenser fan 72 and the evaporator fan 73 can be driven through the installed pulley 71 and the blower drive shaft 70. As a result, the refrigeration cycle can function and the inside of the freezer can be cooled.

  Further, when driving by the electric motor 60 using the commercial power supply 61, the compressor 56 can be driven from the electric motor 60 via the pulley 59, the driving belt 58, and the driven pulley 55. Further, the condenser fan 72 and the evaporator fan 73 can be driven from the electric motor 60 through the same power transmission system as described above. Accordingly, the refrigeration cycle can be functioned in the same manner as described above to cool the inside of the freezer.

  In the power transmission system of the refrigeration apparatus 51, as in the first embodiment, the slip detection means for detecting the slip of the power transmission system, and the slip of the power transmission system detected by the slip detection means are set values. At the time described above, the same effect as that of the first embodiment can be obtained by providing an alarm and providing protection stop means for protecting and stopping the drive side equipment such as the sub engine 52 and the electric motor 60. it can.

[Second example]
FIG. 10 shows a configuration diagram of the refrigeration apparatus 81 according to the second example of the present embodiment.
In this example, as in the case of the first example, the rotation shaft 87 of the compressor 86 is directly connected to the driven pulley 85 of the centrifugal clutch 84 provided on the output shaft 83 of the sub-engine 82. An electric motor 90 is connected to the driven pulley 85 via a drive belt 88 and a driven pulley 89. The electric motor 90 can be driven by a commercial power source.

  A generator (alternator) 94 can be driven from the electric motor 90 through a pulley 91, a belt 92, and a pulley 93. Further, a condenser 95 is connected from the electric motor 90 through a pulley 95, a belt 96, and a pulley 97 with an electromagnetic clutch. The fan 98 can be driven. Also in the refrigeration apparatus 81 having such a power transmission system, the refrigeration apparatus 81 can be cooled by using either the sub engine 82 or the electric motor 90 as a drive source, and the inside of the freezer can be cooled in the same manner as in the above example. .

  As in the first embodiment, the power transmission system of the refrigeration apparatus 81 includes a slip detection means for detecting a slip of the power transmission system, and a slip of the power transmission system detected by the slip detection means. At the time described above, the same effect as that of the first embodiment can be obtained by providing an alarm and providing protection stop means for protecting and stopping the drive side equipment such as the sub engine 82 and the electric motor 90. it can.

[Third example]
FIG. 11 shows a configuration diagram of the refrigeration apparatus 101 according to the third example of the present embodiment.
In this example, the sub-engine 102, the compressor 103, the electric motor 104, and the generator (alternator) 105 are arranged in parallel, and the respective axes are arranged in parallel to each other. A pulley 106 with a centrifugal clutch is provided on the output shaft of the sub-engine 102, double pulleys 107 and 108 are provided on the drive shafts of the compressor 103 and the electric motor 104, and a pulley is provided on the drive shaft of the generator 105. 109 is provided. These pulleys are arranged on the front side of the unit.

  Between the pulley 106 with the centrifugal clutch on the sub-engine 102 side and the double pulley 107 on the compressor 103 side, between the double pulley 107 on the compressor 103 side and the double pulley 108 on the electric motor 104 side, and on the electric motor 104 side. Between the double pulley 108 and the pulley 109 on the generator 105 side, belts 110, 111, and 112 are respectively installed. As a result, the power from the sub-engine 102 is transmitted to the compressor 103, the electric motor 104, and the generator 105 via the pulley 106 with a centrifugal clutch, and the power from the electric motor 104 is double pulley. 108, the belt 111 and the double pulley 107 are transmitted to the compressor 103, and the double pulley 108, the belt 112 and the pulley 109 are transmitted to the generator 105.

  In addition, a condenser fan 113 is provided on the other end side of the drive shaft of the electric motor 104, and a condenser 114 is disposed so as to face the condenser fan 113. Further, a pulley 115 for transmitting power to the cooling water pump is provided on the other end side of the output shaft of the sub-engine 102. Also in the refrigeration apparatus 101 having such a configuration, the refrigeration apparatus 101 can be cooled by using either the sub engine 102 or the electric motor 104 as a drive source, and the inside of the freezer can be cooled in the same manner as in the above example.

  In the power transmission system of the refrigeration apparatus 101, as in the first embodiment, the slip detection means for detecting the slip of the power transmission system, and the slip of the power transmission system detected by the slip detection means are set values. At the above time, the same effect as that of the first embodiment can be obtained by providing an alarm and providing protection stop means for protecting and stopping the drive side equipment such as the sub engine 102 and the electric motor 104. it can.

[Fourth example]
FIG. 12 shows a configuration diagram of the refrigeration apparatus 121 according to the fourth example of the present embodiment.
In this example, the sub-engine 122, the electric motor 123, and the compressor 124 are arranged in parallel, and a generator (alternator) 125 is disposed in the upper front portion of the electric motor 123, and the respective axes are disposed in parallel to each other. It is configured. A pulley 126 with a centrifugal clutch is provided on the output shaft of the sub-engine 122, a condenser fan 127 and a double pulley 128 are provided on the drive shaft of the electric motor 123, and a pulley is provided on the drive shaft of the compressor 124. 129 is provided. These pulleys are arranged on the back side of the unit.

  Between the pulley 126 with a centrifugal clutch on the sub-engine 122 side and the double pulley 128 on the electric motor 123 side, and between the double pulley 128 on the electric motor 123 side and the pulley 129 on the compressor 124 side, respectively, 131 is installed. A belt 134 is installed between a pulley 132 provided on the other end of the drive shaft of the electric motor 123 and a pulley 133 provided on the drive shaft of the generator 125. The capacitor 135 is disposed on the side. A pulley 136 for transmitting power to the cooling water pump is provided on the other end side of the output shaft of the sub-engine 122.

  As a result, the power from the sub-engine 122 is transferred to the condenser fan 127 and the electric motor 123 via the pulley 126 with the centrifugal clutch, the belt 130 and the pulley 128, and to the compressor 124 via the pulley 128, the belt 131 and the pulley 129. Further, the electric power is transmitted to the generator 125 via the electric motor 123, the pulley 132, the belt 134, and the pulley 133, respectively. The power of the electric motor 123 is directly supplied to the condenser fan 127, to the compressor 123 via the pulley 128, the belt 131, and the pulley 129, and further to the generator 125 via the pulley 132, the belt 134, and the pulley 133. It is configured to be transmitted.

  Also in the refrigeration apparatus 121 configured as described above, the refrigeration apparatus 121 can be cooled using either the sub-engine 122 or the electric motor 123 as a drive source, and the inside of the freezer can be cooled in the same manner as in the above example. . As in the first embodiment, the power transmission system of the refrigeration apparatus 121 includes a slip detection means for detecting a slip of the power transmission system, and a slip of the power transmission system detected by the slip detection means. At the above time, while providing an alarm, and providing protective stop means for protecting and stopping drive side devices such as the sub-engine 122 and the electric motor 123, the same operational effects as those of the first embodiment can be obtained. it can.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the embodiment described above, the condenser fan is driven by a sub-engine or an electric motor together with a compressor or the like. However, the condenser fan may be driven by an independent electric motor, and the present invention The refrigeration apparatus having such a configuration is also included.

1 is a schematic configuration diagram of a transport refrigeration apparatus according to a first embodiment of the present invention. It is a block diagram of the rotation slip detection means provided in the power transmission system of the transport refrigeration apparatus shown in FIG. FIG. 2 is a control flow diagram of slip detection when the engine of the transport refrigeration apparatus shown in FIG. 1 is driven. It is a control flow figure of slip detection at the time of a commercial power supply (electric motor) drive of the refrigeration equipment for transportation shown in FIG. FIG. 4 is a subroutine flow diagram of rotation detection where the clutch is engaged in the control flow shown in FIG. 3. FIG. 5 is a subroutine flow chart for clutch fixation detection in the control flow shown in FIGS. 3 and 4. FIG. 5 is a subroutine flow chart of clutch temperature detection in the control flow shown in FIGS. 3 and 4. FIG. 5 is a subroutine flowchart of slip detection in the control flow shown in FIGS. 3 and 4. It is a block diagram of the 1st example of the transport refrigeration apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram of the 2nd example of the transport refrigeration apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram of the 3rd example of the transport refrigeration apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram of the 4th example of the transport refrigeration apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

1,51,81,101,121 Transport refrigeration equipment (refrigeration equipment)
2,52,82,102,122 Sub-engine (engine)
6, 60, 90, 104, 123 Electric motor 8, 54, 84 Centrifugal clutch (clutch)
9 Motor side pulley 10 Blower (propeller fan)
11, 56, 86, 103, 124 Compressor 12, 97 Pulley with electromagnetic clutch (electromagnetic clutch)
13, 69, 94, 105, 125 Generator (alternator)
14 Driven pulleys 15, 58, 88 Drive belt 21, 78 Controller 22 Slip detection means 23 Heat generation detection means 24 First rotation speed difference detection means 25 Second rotation speed difference detection means 26 Third rotation speed difference detection means 27 Fourth rotation Number difference detection means 28 Fifth rotation speed difference detection means 29 Sixth rotation speed difference detection means 30 Thermostat or thermistor 31 Flywheel rotation sensor 32 Motor side pulley rotation sensor 33 Power generation frequency 34 Discharge pressure pulsation frequency 35, 36 Rotation sensor 37 AC Power generation frequency 38 Protection stop means 39 Operation switch 40 Protection operation means 41 Clutch fixation detection means 42 Clutch engagement rotation speed detection means 55, 59, 85, 89 Driven pulleys 62, 64, 65, 68, 71, 91, 93, 95 Pulley 63, 67, 92, 96 Belt 72, 98, 113, 12 Pulley with a fan 106 and 126 centrifugal clutch capacitor 107,108,128 double pulley 109,129,132,133 pulleys 110,111,112,130,131,134 belt

Claims (5)

An engine and / or an electric motor as a drive side device, such as a compressor, a generator, a blower, or the like that is driven either directly by the engine or the electric motor or through power transmission means such as a clutch, a pulley, and a drive belt In a transport refrigeration system equipped with driven equipment,
A slip detection means for detecting slippage of the power transmission means, and a protection stop for issuing a warning when the slippage of the power transmission means detected by the slip detection means is greater than or equal to a set value, and for protecting and stopping the drive side equipment Means and
The protection stop means is configured to enable a return operation by the operation switch if the protection stop has not continued for the set number of times, and to disable the return operation by the operation switch when the protection stop has been continued for the set number of times or more. A transport refrigeration apparatus characterized by comprising:   When the slip of the power transmission means detected by the slip detection means is less than the set value and greater than or equal to the second set value, an alarm is issued and the operation is continued by reducing the load power of the driven device. The transport refrigeration apparatus according to claim 1, further comprising protective operation means.   The slip detection means is a thermostat for detecting heat generation due to slippage of the clutch, a heat generation detection means such as a thermistor, a first rotation speed difference detection means for detecting slip from a rotation speed difference between the power transmission side and the driven side of the clutch, Second rotational speed difference detecting means for detecting slip from a difference between a driven side rotational speed calculated from a power generation frequency of the electric motor driven and rotated through the clutch and a driving side equipment rotational speed such as an engine rotational speed; A third rotational speed difference detecting means for detecting slippage of the power transmission system from the difference between the compressor rotational speed calculated from the discharge pressure pulsation frequency of the compressor and the drive side equipment rotational speed such as the engine rotational speed; Fourth rotation speed difference for detecting slipping from the difference between the rotational speed of the rotating part of the pulley or the interlocked device and the rotational speed of the driven pulley or the driven equipment linked to the pulley Output means, fifth speed difference detection means for detecting slip from the difference between the generator speed calculated from the AC power generation frequency of the generator and the drive side equipment speed such as the engine or the electric motor, and commercial power supply Any one of sixth rotational speed difference detecting means for detecting slipping from the difference between the rotational speed of the driven device driven by the electric motor driven by the motor and the electric motor rotational speed calculated from the power supply frequency; Alternatively, the transport refrigeration apparatus according to claim 1, wherein the transport refrigeration apparatus is configured by a plurality.   The first rotation speed difference detection means is used as the slip detection means, and includes clutch fixation detection means for detecting whether or not the clutch is fixed from the detection value of the first rotation speed difference detection means. 4. The transport refrigeration apparatus according to claim 3, wherein the transport refrigeration apparatus is configured to issue an alarm and detect and stop the driving side device when the clutch is detected to be stuck. The first rotational speed difference detecting means is used as the rotational slip detecting means, the clutch connected rotational speed detecting means for detecting the rotational speed of the clutch from the detection value of the first rotational speed difference detecting means, and the clutch connected. The rotational speed detection means is configured to determine that the clutch is abnormal when the difference between the clutch-connected rotational speed and a set rotational speed is equal to or greater than a set value, to issue an alarm, and to protect and stop the driving side device. The transport refrigeration apparatus according to claim 3 or 4, wherein the transport refrigeration apparatus is provided.

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