JP2008261561A - Protection control device for refrigeration cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which an abnormality is determined in a temporary condition at unsteady time, and provide an inexpensive protection control device for a refrigeration cycle device stably operable without causing malfunction and having good quality. <P>SOLUTION: A microcomputer 1 compares a difference between a detection value Ta of an equipment ambient temperature sensor 2 and a detection value Te of a cooler temperature sensor 3, and operates a refrigeration cycle abnormality determination function 6 and its abnormality frequency integration function 7 after the passage of set time ts1 set by a compressor operation timer function 5 to achieve a stable state after start of the compressor. When abnormality frequency Nr1 of the abnormality frequency integration function 7 exceeds a set value N1, a refrigeration cycle abnormality display device 4 is displayed and operation of the equipment is stopped. Thus, the refrigeration cycle device can be stably operated without causing malfunction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a device protection control apparatus using a refrigeration cycle.

  The block diagram of the protection control apparatus of the apparatus using the conventional refrigeration cycle is shown in FIG. A refrigeration cycle comprising a compressor 101, a radiator 102, an expander 103, a cooler 104, and a blower 105 is provided with a control device 113 for controlling the equipment. The compressor 101 is operated by the control device 113 through an overload relay 107. Be controlled. Further, a control device is provided which includes a rotation speed meter 108 for detecting the rotation speed of the compressor 101, a radiator inlet refrigerant thermometer 109, a radiator air thermometer 110, a cooler inlet refrigerant thermometer 111, and a cooler air thermometer 112. An abnormality is detected as the control input 113 and displayed on the control content display device 114.

  Hereinafter, a device protection control apparatus using the refrigeration cycle will be described with reference to FIGS. 9 and 10.

  In Japanese Patent Laid-Open No. 8-128765, as shown in the control flow of FIG. 9, the operation is started, and in step S101, the refrigerant discharge state time Tt = 0 is set. In step S102, it is determined whether the operation is cooling or heating. In this case, in step S103, the operation frequency f is compared with the determination reference frequency fc, the operation current i is compared with the reference operation current ic, the difference T between the suction temperature and the outlet temperature or the pipe temperature of the indoor or outdoor heat exchanger, and the reference The temperature difference Tc is compared, and only when all of f ≧ fc, i ≦ ic, and T ≦ Tc are satisfied, the process proceeds to step S105. Otherwise, the process returns to step S101 and the above calculation steps are repeated.

  In the case of heating operation, the operation frequency f is compared with the determination reference frequency fh in step S104, the operation current i is compared with the reference operation current ih, and the suction temperature and the discharge temperature or the pipe temperature of the indoor or outdoor heat exchanger are compared. The difference T is compared with the reference temperature difference Th, and only when f ≧ fh, i ≦ ih, and T ≦ Th are satisfied, the process proceeds to step S105. Otherwise, the process returns to step S101 and the above calculation steps are repeated.

  In step S105, 1 is added to the refrigerant state time Tt. In step 106, Tt is compared with the reference refrigerant removal time Tg. If Tt ≧ Tg, the process proceeds to step S107. repeat.

  Next, in step S107, the operation of the compressor is stopped, and further, the control content display device displays that it is in the refrigerant removal control state.

  In Japanese Patent Application Laid-Open No. 9-159293, as shown in the control flow of FIG. 10, the heat exchange inlet pipe temperature Th and the room temperature Ti are detected (S201), and the difference temperature T between the heat exchange inlet pipe temperature Th and the room temperature Ti is detected. Is lower than the set temperature T1 (S202). If the condition is not satisfied, the process returns to S201. If the condition is satisfied, the compressor operating frequency f is detected (S203). If it is determined (S204) and the set frequency fa or higher, the compressor operation time t is measured (S205), the compressor operation time t is compared with the set time t1 (S206), and the compression is performed after the set time t1 has elapsed. It is determined whether the machine continuously exceeds the set frequency fa for the set time t1 (S207). If the condition is not satisfied, the measurement time t is cleared and the process returns to S201 to satisfy the condition. It stops the compressor immediately when I was (S208), to protect the compressor. By this control, it is possible to avoid a refrigeration cycle failure due to refrigerant gas loss by limiting the operation to a set frequency or higher and continuously for a set time.

In the case where the overload relay 107 is provided separately from the protection control for the refrigerant outage state by the above control method, the compressor operation is stopped when the compressor surface temperature or the input current exceeds a uniquely determined value. By doing so, it is common to avoid abnormal heating of the compressor due to refrigerant gas loss and overload abnormal conditions such as high pressure abnormality and lock of the compressor 101.
JP-A-8-128765 JP-A-9-159293

  In such a protection control device for a conventional refrigeration cycle device, first, when the calculation repetition time interval is short or the number of abnormality determinations is small, the refrigerant temporarily leaks at the time of start-up or in an unsteady state due to a change in state. There is a problem that the abnormal condition may be satisfied and the refrigerant leakage may be determined to be abnormal even though it is not in an abnormal state.

  Second, the compressor stop command by room temperature control and defrost control, the operation of the overload relay, the compressor, even if the abnormality determination frequency is large or the abnormality determination timing is an abnormal state due to refrigerant leakage If the compressor is stopped due to other control factors such as the lock of the engine, it will not be reset because it does not satisfy the abnormality determination in steps S103, S104, S204, and S207, and it will not be determined to be abnormal even in the refrigerant leakage abnormal state. There was a problem that there was a case.

  Thirdly, expensive detection means such as a detection means for the operating frequency f of the compressor and a detection means for the operating current i are necessary, and there is a problem that the manufacturing cost increases.

  Fourth, when an abnormality is detected as a control input of the control device 113, a display output is made on the control content display device 114, but only the compressor 101 is stopped, and the device such as the blower 105 is not stopped. There has been a problem that there is a possibility of expansion damage of equipment due to being restarted without being noticed by the user or being misused many times just by resetting the machine.

  The present invention solves the above-described problem, and can be stably operated without malfunction even in the case of a temporary unstable state or an abnormal state that is not determined to be abnormal, and is an inexpensive and high-quality refrigeration cycle apparatus. An object of the present invention is to provide a protection control device.

  In order to achieve the above-described object, the first problem-solving means taken by the present invention includes a refrigeration cycle apparatus including a compressor, a radiator, an expander, a cooler, and a blower provided in the main body, and the surface of the main body. Ambient temperature detection means provided on the cooler, a cooler temperature detection means for detecting the surface temperature of the cooler, a detection temperature Ta of the ambient temperature detection means, and a detection temperature Te of the cooler temperature detection means are calculated and determined. Then, the operation of the refrigeration cycle apparatus is stopped and a control unit that operates to display the abnormality by operating the abnormality display means, and this control unit controls the detection temperature when the refrigeration cycle apparatus is driven and controlled. An abnormality determination function that records the frequency when the temperature difference (Ta−Te) is smaller than the reference temperature difference T0 as the integration number Nr1, and determines that an abnormality occurs when the integration number Nr1 becomes the reference number N1 or more. The compressor is one that was provided with the compressor timer function for operating the abnormality determination function when passed ts1 set stabilization time to stabilize the operation.

  In this means, the refrigeration cycle abnormality determination function operates at the stable time ts1 set by the compressor operation timer function, and compares the difference between the device ambient temperature Ta and the cooler temperature detection Te to determine abnormality. At this time, since the stable time ts1 has elapsed since the start of the compressor, the refrigeration cycle is in a stable state, so that the refrigeration cycle operates normally and the temperature difference between the device ambient temperature Ta and the cooler temperature detection Te (Ta− It is possible to correctly determine whether Te) exceeds the reference temperature difference T0 or whether it is equal to or less than the reference temperature difference T0 due to refrigerant removal. Also, the temperature difference between the device ambient temperature Ta and the cooler temperature detection Te (Ta-Te) is that the refrigeration cycle is not operating normally due to a malfunction of the safety device not controlled by the control unit such as an overload relay) or the compressor itself. Is not more than the reference temperature difference T0, the abnormality can be correctly determined. When it is determined that there is an abnormality, the refrigeration cycle abnormality display means is displayed when the abnormality frequency Nr1 becomes equal to or greater than the set value N1, and the operation of the device is stopped.

  Further, the second problem-solving means taken by the present invention includes a refrigeration cycle apparatus comprising a compressor, a radiator, an expander, a cooler and a blower provided in the main body, and a cooler provided on the suction side of the cooler. Calculating an intake air temperature detection means, a cooler temperature detection means for detecting a surface temperature of the cooler, a detection temperature Tb of the cooler intake air temperature detection means, and a detection temperature Te of the cooler temperature detection means; A control unit for determining and stopping the operation of the refrigeration cycle apparatus and operating the abnormality display means to display the abnormality, and when the control unit is driving and controlling the refrigeration cycle apparatus, the detected temperature An abnormality determination function that records the frequency when the temperature difference (Tb−Te) of the current is smaller than the reference temperature difference T0 as the integration number Nr1, and determines that an abnormality occurs when the integration number Nr1 becomes equal to or greater than the reference number N1. Until it said compressor has elapsed set settling time ts1 until stable operation is one having the above does not operate an abnormality determination function compressor timer function.

  In this means, in addition to the same action as the first problem solving means, the refrigeration cycle abnormality determination function is used not for the device ambient temperature Ta but for the cooler intake air temperature detection value Tb that is the temperature of the air that is directly heat-exchanged by the cooler. It detects and compares the difference of the cooler suction air temperature detection value Tb and the cooler temperature detection Te, and performs abnormality determination.

  The third problem solving means provided by the present invention is the second compressor timer in which the control unit repeatedly performs the determination operation for performing the refrigeration cycle abnormality determination function within the time interval t0 after the stable time ts1 has elapsed. It has a function.

  In this means, by operating the refrigeration cycle abnormality determination function at the time interval t0 after the stabilization time ts1, when the abnormal state continues continuously, the abnormality frequency Nr1 is accelerated to become the set value N1 or more. Thus, when an abnormal state occurs intermittently, the abnormality number Nr1 is delayed from becoming the set value N1 or more, and the refrigeration cycle abnormality determination is performed according to the situation.

  The fourth problem-solving means taken by the present invention is that the control unit is set until the compressor is stably operated when the operation condition is changed by the control unit after the stabilization time ts1 has elapsed. A third compressor timer function is provided in which the abnormality determination function is not operated until the stable time ts2 elapses, and thereafter the determination operation for performing the refrigeration cycle abnormality determination function within the time interval t0 is repeated. It is.

  In this means, the refrigeration cycle abnormality determination is performed after the refrigeration cycle is stabilized by setting the stabilization time ts1 after starting the compressor as the time required for the stabilization of the refrigeration cycle. In addition, when the control unit changes the operating conditions such as the air volume and the compressor frequency even when the compressor is continuously operated, the refrigeration is performed by setting the stable time ts2 after the operating condition is changed as the time required for the stability of the refrigeration cycle. Cycle abnormality judgment is performed after the refrigeration cycle is stabilized. Further, after the refrigeration cycle is stabilized, it is performed at the time interval t0, and when the abnormal state continues continuously, the abnormal number Nr1 is accelerated to become the set value N1 or more, and the abnormal state is intermittently generated. If it occurs, the abnormality number Nr1 is delayed from becoming the set value N1 or more, and the refrigeration cycle abnormality determination is performed according to the situation.

  The fifth problem solving means provided by the present invention is such that the time interval t0 set in the compressor timer function is set shorter than the stable time ts1 or ts2.

  In this means, after the refrigeration cycle is stabilized, the set time is performed at t0 shorter than ts1 and ts2, so that when the abnormal state continues continuously, the number of abnormal times Nr1 becomes equal to or greater than the set value N1. If the abnormal state occurs intermittently earlier, the abnormality number Nr1 is delayed from being equal to or greater than the set value N1, and the refrigeration cycle abnormality determination is performed according to the situation.

  Further, the sixth problem solving means taken by the present invention is that the time interval t0 and the stable times ts1 and ts2 set by the compressor timer function are the shortest defrosting transition set as necessary for shifting to the defrosting operation. It is set shorter than time td.

  With this means, even when the defrosting operation is performed and the compressor is stopped by the control unit, the refrigeration cycle abnormality is reliably determined at least once before the defrosting operation is shifted.

  Further, the seventh problem solving means provided by the present invention is provided with an operation switch for operating the refrigeration cycle apparatus in the main body, and when the operation switch is operated, the abnormal number Nr1 stored in the control unit is stored. The data is initialized.

  In this means, the abnormality number Nr1 of the refrigeration cycle abnormality determination function is initialized when the user's operation of switching the operation switch of the refrigeration cycle apparatus is accompanied. Therefore, the detection of the refrigeration cycle abnormality is detected from the start of operation. It will operate when left unattended for a long time.

  The eighth problem-solving means taken by the present invention is the provision of power supply means for supplying power from a commercial power supply, and the number of abnormalities stored in the control section when energization is stopped via the power supply means. Nr1 data is initialized.

  In this means, the refrigeration cycle abnormality determination function abnormality count Nr1 is initialized when the refrigeration cycle apparatus is completely de-energized, so that the detection of the refrigeration cycle abnormality is related to the operation or stop operation. It will operate when it continues to be used in an abnormal state.

  The ninth problem solving means provided by the present invention holds the data of the number of abnormal times Nr1 stored in the control unit even when the energization to the refrigeration cycle apparatus is stopped.

  With this means, the refrigeration cycle abnormality display means displays the refrigeration cycle abnormality display means when the number of abnormalities Nr1 is equal to or greater than the set value N1, stops the operation of the equipment, and makes it impossible to operate the refrigeration cycle apparatus. .

  According to a tenth problem solving means provided by the present invention, an abnormality display number Nr2 is added to the refrigeration cycle abnormality determination function to add up the number of times the abnormality display is performed on the abnormality display means. The abnormality display number Nr2 is the refrigeration cycle apparatus. Is stored even if energization is stopped, and the refrigeration cycle abnormality display means is displayed and the refrigeration cycle apparatus cannot be restarted when the number Nr2 of abnormal display in the previous period exceeds the set value N2. It is.

  With this means, the refrigeration cycle abnormality determination function displays the refrigeration cycle abnormality display means when the number of abnormalities Nr1 exceeds the set value N1, and stops the operation of the device, but the user ignores the alert and uses it. If the number Nr2 of abnormal display continues to be equal to or greater than the set value N2, the refrigeration cycle abnormality display means is displayed and the refrigeration cycle apparatus cannot be operated.

  Further, an eleventh problem solving means provided by the present invention is provided with an initialization function of the number of abnormal times Nr1 or the number of abnormal display times Nr2 in the refrigeration cycle apparatus.

  In this means, since the initialization function is provided in the refrigeration cycle apparatus, the user cannot operate the initialization function and is initialized at the time of shipment or when a repair worker repairs.

  By adopting such a configuration, the present invention has the following effects.

  In order to judge abnormalities when the refrigeration cycle is stable, erroneous detection due to temporary conditions during non-stationary conditions is prevented, and abnormal judgment is not made if the refrigeration cycle is not operating due to a normal compressor stop under the control of the equipment control unit. In addition, in the case of a refrigeration cycle abnormality caused by a compressor stop or refrigerant missing abnormality that is not controlled by the control unit, it is possible to detect abnormality of the refrigeration cycle as well as refrigerant missing by judging abnormality.

  In addition, the control unit, the device ambient temperature detection means, the cooling temperature detection means for detecting the temperature of the cooler, and the refrigeration cycle abnormality display means are generally mounted for different purposes, and they can be used. In addition, expensive detection means such as a detection means for the operating frequency f of the compressor and a detection means for the operating current i are not necessary, and the compressor can be manufactured at low cost.

  Further, since the abnormality is detected and displayed, and the device is stopped, the user can be surely recognized that it is abnormal use, and the possibility of expansion damage can be reduced.

  Moreover, it can be determined with higher accuracy whether there is an abnormality in the temperature of the cooler due to the action of the refrigeration cycle, and erroneous detection can be prevented.

  In addition, since the abnormality is determined at the stable time ts1 after the start of the refrigeration cycle, erroneous detection due to a temporary state during the non-steady state is prevented, and the abnormality is determined at intervals of t0 at the stable time. If it continues, the abnormality is detected and displayed early and the device is stopped. Therefore, it is possible to reduce the possibility of expansion damage while preventing false detection.

  In addition, since the determination is made based on the cumulative time of the product (t0 × N1) of the time interval t0 set by the compressor operation timer function and the set value N1 of the number of abnormal times Nr1, the erroneous detection is prevented and the device is easily stopped. You can avoid it.

  In addition, in order to determine an abnormality at a stable time ts1 after the start of the refrigeration cycle, erroneous detection due to a temporary state during non-steady state is prevented, and an abnormality is determined at a stable time after the refrigeration cycle operating condition is changed after a stable time ts2. Therefore, erroneous detection due to a temporary state during non-stationary state is prevented, and abnormality is determined at intervals of t0 when stable. Therefore, when an abnormal state continues continuously, an abnormality is detected and displayed quickly. Since the equipment is stopped, the possibility of expansion damage can be reduced while preventing false detection.

  In addition, since the time interval t0 is shorter than the stable time ts1 or ts2, when the abnormal state continues continuously, the abnormality is detected and displayed early, and the device is stopped. The possibility of damage can be reduced.

  Moreover, the abnormality determination of a refrigerating cycle is reliably performed regardless of the normal compressor stop by control in a defrosting operation, and an erroneous detection can be prevented.

  In addition, an abnormality is detected and displayed only when an abnormal state is left for a time equal to or longer than the product (t0 × N1) of the time interval t0 set by the compressor operation timer function and the set value N1 of the number Nr1 of abnormalities. At the same time, since the device is stopped, even when the compressor is unstable, it is possible to prevent the device from being stopped due to erroneous detection.

  In addition, if you continue to use without noticing the refrigeration cycle abnormality, it will detect and display the abnormality and stop the equipment. Can be reduced.

  In addition, if you continue to use it while you notice an abnormality in the refrigeration cycle, it will detect and display the abnormality and stop the equipment so that the operation switch cannot operate the equipment. Can be reduced.

  In addition, it is possible to reduce the possibility of expansion damage due to easy initialization by the user, and to reduce repair errors by performing initialization work to raise awareness of repair workers, preventing and expanding recurrence The possibility of damage can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is used about the component same as the conventional example, and detailed description is abbreviate | omitted.

(Embodiment 1)
The configuration of the dehumidifying device according to the first embodiment of the present invention is shown in FIG. A microcomputer 1 is provided as a control unit for controlling the refrigeration cycle device 106 in the main body 20, and the microcomputer 1 has control functions such as a compressor operation timer function 5, a refrigeration cycle abnormality determination function 6, and an abnormality frequency integration function 7. ing. Further, on the input side of the microcomputer 1, a device ambient temperature sensor 2 as a device ambient temperature detection means for detecting the air temperature around the device, and a cooler temperature sensor 3 as a cooler temperature detection means for detecting the temperature of the cooler 104. An operation switch 8 for starting / stopping the device and an initialization function 9 for initializing the integrated value of the abnormality frequency integration function 7 are provided, and a refrigeration cycle abnormality display is provided on the output side of the microcomputer 1 to notify the abnormality of the device. A device 4 is provided.

  The operation in the above configuration will be described with reference to the control flow shown in FIG. First, when an operation start command is issued from the microcomputer 1 by an input operation of the operation switch 8, the compressor 101 is activated and the refrigeration cycle 106 is started. Next, when the compressor operation timer function 5 is entered and the continuous operation time of the compressor 101 reaches the stable time tr1, the refrigeration cycle abnormality determination function 6 operates. At this time, the continuous operation time of the compressor 101 is a continuous operation time recognized by the microcomputer 1 from when the microcomputer 1 issues an operation start command of the compressor 101 to when it issues an operation stop command, and the overload relay 107 It is not considered that the compressor 101 is stopped by a device that does not depend on the microcomputer 1. Therefore, the time during which the compressor 101 is actually continuously operated is not necessarily the same.

  Next, in the refrigeration cycle abnormality determination function 6, when the difference between the detected value Ta of the device ambient temperature sensor 2 and the detected value Te of the cooler temperature sensor 3 is 0 or less (Ta−Te ≦ 0), it is determined that the abnormal state has occurred. Then, the process shifts to the abnormal number accumulation function 7. The abnormality frequency integration function 7 integrates the abnormality frequency Nr1, stops the operation of the device when Nr1 exceeds the set value N1, and indicates that the abnormality has occurred in the refrigeration cycle abnormality display device 4 and the device has stopped. Inform the user.

  In this way, the microcomputer 1 can determine the abnormality when the refrigeration cycle is stable by activating the refrigeration cycle abnormality determination function 6 after the stabilization time tr1 to determine abnormality, and the refrigeration cycle is in a temporary unsteady state. False detection can be prevented. In addition, when the refrigeration cycle is not operating due to the normal stop of the compressor 101 under the control of the microcomputer 1, the refrigeration cycle is not determined when the refrigeration cycle is not operating. In the case of a cycle abnormality, it is possible to detect an abnormality in the refrigeration cycle as well as refrigerant removal by determining the abnormality.

  Further, since the microcomputer 1, the device ambient temperature sensor 2, the cooler temperature sensor 3, and the refrigeration cycle abnormality display device 4 can use commonly used general-purpose parts, the detection means and the operation of the compressor operating frequency f There is no need for expensive detection means such as current i detection means, and the current i can be manufactured at low cost.

  In addition, since the abnormality is detected and displayed on the abnormality display device 4 and the device is stopped, the conventional abnormality is displayed but the air is blown to avoid being noticed and easily recognized by the user. The possibility of expansion damage can be reduced.

(Embodiment 2)
As shown in FIG. 3, the basic configuration is the same as that of the first embodiment, but the device ambient temperature sensor 2 in FIG. 1 is changed to a cooler intake air temperature sensor 10 as a cooler intake air temperature detection means. Yes.

  As a result, the device ambient temperature Ta is not necessarily the same as the cooler suction air temperature Tb, which is the temperature of the air that is directly heat-exchanged by the cooler 104 depending on the actual use state and conditions, but heat generation from other peripheral devices, solar radiation, Since it is affected by airflow, etc., at the position where it is not affected as much as possible, the difference between the detected value Tb of the cooler intake air temperature sensor 10 and the detected value Te of the cooler temperature sensor 3 is compared, and an abnormality is determined. Whether or not the temperature of the cooler 104 due to the operation of the refrigeration cycle is abnormal can be determined with higher accuracy, and erroneous detection can be prevented.

  Further, the operation of the protection control device in such a configuration is basically the same as that of the first embodiment, but in this embodiment, the compressor operation timer function 5 shown in the flowchart of FIG. 4 is changed. is doing. That is, when an operation start command for the compressor 101 is issued from the microcomputer 1, the compressor is activated and the refrigeration cycle is started. Next, the compressor operation timer function 5 is entered, and the refrigeration cycle abnormality determination function 6 is executed every time interval t0 hours when the compressor 101 is continuously operated. At this time, the continuous operation time of the compressor 101 is a continuous operation time recognized by the microcomputer 1 from when the microcomputer 1 issues an operation start command of the compressor 101 to when it issues an operation stop command, and is an overload relay. It is not considered that the compressor 101 is stopped by a device such as 107 that does not depend on the microcomputer 1. Therefore, the time during which the compressor 101 is actually continuously operated is not necessarily the same.

  As described above, by determining the abnormality at the time interval t0, it is possible to determine the abnormality when the refrigeration cycle is stable, and to prevent erroneous detection due to a temporary unsteady state. In addition, when the refrigeration cycle is not operating due to the normal stop of the compressor 101 under the control of the microcomputer 1 that controls the device, the abnormality is not determined, and the compressor 101 is not stopped or the refrigerant is not removed without the control of the microcomputer 1. In the case of a refrigeration cycle abnormality caused by an abnormality, it is possible to detect an abnormality of the refrigeration cycle as well as refrigerant removal by determining the abnormality.

  Further, since the time required for the determination requires at least the time calculated by the product (t0 × N1) of the time interval t0 set by the compressor operation timer function 5 and the set value N1 of the number of abnormal times Nr1, It is possible to prevent erroneous detection without easily stopping the device.

(Embodiment 3)
FIG. 5 shows a control flow diagram of the second compressor operation timer function 5.

  When the microcomputer 1 issues a start command for the compressor 101, the flag Nt of the compressor operation timer function 5 is initialized to 0, and the compressor operation timer function 5 is entered. In the compressor operation timer function 5, first, the timer recognition time t is initialized and the timer count is started. When the flag Nt is 0, t = ts1. That is, after ts1 hour from the start of the compressor, the flag Nt = 1 is set, the compressor operation timer function 5 is exited, and the refrigeration cycle abnormality determination function 6 is proceeded to. When the flag Nt is not 0, t = t0, the flag Nt = 1 is set at the time interval t0, the compressor operation timer function 5 is exited, and the refrigeration cycle abnormality determination function 6 is performed.

  Thus, the refrigeration cycle abnormality determination can be performed after the refrigeration cycle is stabilized by setting the stabilization time ts1 after starting the compressor as the time required for the refrigeration cycle to be stable. In addition, after the refrigeration cycle is stabilized, the stabilization time is performed at t0 shorter than ts1, so that when the abnormal state continues continuously, the abnormal frequency integration function 7 sets the abnormal frequency Nr1 to be equal to or greater than the set value N1. If the abnormal state occurs intermittently, the abnormal number accumulation function 7 delays the abnormal number Nr1 from becoming the set value N1 or more, and the refrigeration cycle according to the occurrence state of the abnormal state Abnormality determination can be performed appropriately.

  As described above, the abnormality determination is performed at the stable time after the refrigeration cycle is started after the stabilization time ts1, so that the erroneous detection due to the temporary unsteady state is prevented, and the abnormality determination is performed at the t0 interval shorter than the set time ts1 at the stable time. Therefore, if the abnormal state continues continuously, the abnormality is detected and displayed at an early stage and the device is stopped, so that the possibility of enlargement damage can be reduced while preventing false detection. .

(Embodiment 4)
FIG. 6 shows a control flow diagram of the third compressor operation timer function 5.

  When the microcomputer 1 issues a start command for the compressor 101, the flag Nt of the compressor operation timer function 5 is initialized to 0, and the compressor operation timer function 5 is entered. In the compressor operation timer function 5, first, the timer recognition time t is initialized and the timer count is started. When the flag Nt is 0, t = ts1, i.e., after the compressor is started, ts1 hour later, the flag Nt = 1 is set, the compressor operation timer function 5 is exited, and the refrigeration cycle abnormality determination function 6 is performed. When the flag Nt is not 0, when the microcomputer changes the operating conditions such as the fan rotation speed and the compressor frequency, the timer is started with t = 0 and the timer is started with t = 0, and the compressor is set with the flag Nt = 1 after ts2 hours. Exit the operation timer function 5 and go to the refrigeration cycle abnormality determination function 6. Further, when the flag Nt is not 0 and the microcomputer does not change the operation condition such as the fan rotation speed and the compressor frequency, the flag Nt = 1 is set at the time interval t0, the compressor operation timer function 5 is exited, and the refrigeration cycle is abnormal. Proceed to determination function 6.

  Thus, the refrigeration cycle abnormality determination is performed after the refrigeration cycle is stabilized by setting the set time ts1 after starting the compressor as the time required for the stabilization of the refrigeration cycle. In addition, when the microcomputer 1 changes the operating conditions such as the air volume and the compressor frequency even if the compressor is continuously operated, the set time ts2 after changing the operating conditions is set as the time required for the stability of the refrigeration cycle. The refrigeration cycle abnormality determination is performed after the refrigeration cycle is stabilized. In addition, after the refrigeration cycle is stabilized, the set time is set to t0 shorter than ts1 and ts2, and if the abnormal state continues continuously, the abnormal frequency integration function 7 sets the abnormal frequency Nr1 to be equal to or greater than the set value N1. If the abnormal condition occurs intermittently, the abnormality frequency integration function 7 delays the abnormality frequency Nr1 from being equal to or higher than the set value N1, and the refrigeration cycle abnormality determination is appropriately performed according to the situation. Will be done.

  As described above, the abnormality can be determined at the time of stabilization after the set time ts1 from the start of the refrigeration cycle, so that erroneous detection due to a temporary unsteady state can be prevented, and furthermore, when the operating condition of the refrigeration cycle is stable after the set time ts2 Since an abnormality can be determined, erroneous detection due to a temporary unsteady state can be prevented. And when it is stable, an abnormality is determined at intervals of t0 shorter than the set time ts1 or ts2, so if the abnormal state continues continuously, the abnormality is detected and displayed at an early stage and the device is stopped. It is possible to reduce the possibility of expansion damage while preventing the damage.

(Embodiment 5)
As shown in FIG. 6, the time interval t0, ts1 or ts2 set in the compressor operation timer function 5 is set to be shorter than the shortest time td (not shown) for shifting to the defrosting operation. Thereby, even when the defrosting operation is performed during the operation of the apparatus and the compressor 101 is stopped by the control of the microcomputer 1, it is possible to reliably determine the refrigeration cycle abnormality at least once before the transition to the defrosting operation. Therefore, it is possible to reliably perform the refrigeration cycle abnormality determination regardless of the normal stop of the compressor 101 under the control of the microcomputer 1 in the defrosting operation, and prevent erroneous detection.

(Embodiment 6)
The refrigeration cycle abnormality determination function 6 of the refrigeration cycle apparatus 106 will be described. As shown in FIG. 1 or FIG. 2, the microcomputer 1 determines whether the operation of the device is started or stopped based on a signal from the operation switch 8. When the microcomputer 1 starts to operate the device by the signal from the operation switch 8, the abnormality frequency Nr1 of the abnormality frequency integration function 7 is initialized to zero. As a result, it is initialized when the user's action of switching the operation switch 8 is accompanied. Therefore, even in an abnormal state, the user starts and stops driving and recognizes the driving state. In such a case, stop the operation of the device and do not display the refrigeration cycle abnormality display device 4. However, when an abnormal state is left for a long time after the start of operation, the operation is performed.

  Therefore, an abnormality is detected when an abnormal state is left for at least the calculation time of the product (t0 × N1) of the time interval t0 set by the compressor operation timer function 5 and the set value N1 of the abnormality frequency Nr1. Since the device is stopped while being displayed, erroneous detection can be prevented without easily stopping the device.

(Embodiment 7)
As shown in FIGS. 1 and 2, in the refrigeration cycle abnormality determination function 6 of the refrigeration cycle apparatus 106, energization is started by inserting a plug (not shown) of the main body 20 into a power source, and the microcomputer 1 is activated. The abnormality number Nr1 of the abnormality number accumulation function 7 is initialized to zero. As a result, when the microcomputer 1 is continuously energized, the number of abnormal times Nr1 is accumulated without being initialized, and operates when the microcomputer 1 continues to be used in the abnormal state.

  Therefore, if you continue to use without noticing the refrigeration cycle, the abnormality is detected and displayed, and the equipment is stopped, increasing the possibility of being noticed by the user and reducing the possibility of expansion damage. it can. Moreover, since it is necessary to stop energization of an apparatus once when using again, the expansion damage by reusing easily can be prevented.

(Embodiment 8)
As shown in FIGS. 1 and 2, in the refrigeration cycle abnormality determination function 6 of the refrigeration cycle apparatus 106, the abnormality number Nr1 of the abnormality number integration function 7 is stored in the microcomputer 1 and stored even when the refrigeration cycle apparatus 106 is de-energized. Hold. As a result, when the abnormality frequency Nr1 becomes equal to or greater than the set value N1 by the abnormality frequency integration function 7, the refrigeration cycle abnormality display device 4 is displayed, the operation of the equipment is stopped, and the refrigeration cycle device 106 cannot be operated. Therefore, if the refrigeration cycle continues to be used in an abnormal state, the abnormality is detected and displayed, and the device is stopped and the device cannot be operated, reducing the possibility of expansion damage due to abnormal use. can do.

(Embodiment 9)
As shown in FIG. 7, in the refrigeration cycle abnormality determination function 6 of the refrigeration cycle apparatus 106, a function of adding the abnormality display number Nr2 in which the abnormality number Nr1 is equal to or greater than the set value N1 is added to the abnormality number integration function 7. The abnormality display number Nr2 is stored and retained even when the refrigeration cycle apparatus 106 is de-energized. When the previous period abnormality display number Nr2 exceeds the set value N2, the refrigeration cycle abnormality display means 4 is displayed, and the refrigeration cycle apparatus 106 is displayed. Cannot be operated. As a result, when the number of abnormal times Nr1 becomes equal to or greater than the set value N1 by the abnormal number integration function 7, the refrigeration cycle abnormality display means 4 is displayed and the operation of the equipment is stopped, but the user ignores the warning and uses it. Subsequently, when the abnormality display count Nr2 becomes equal to or greater than the set value N2, the refrigeration cycle abnormality display means 4 is displayed and the refrigeration cycle apparatus 106 cannot be operated. Therefore, if you notice the abnormality of the refrigeration cycle and continue to use it, it will detect and display the abnormality and stop the equipment, making it impossible to operate the equipment, reducing the possibility of expansion damage due to abnormal use. it can.

  When the microcomputer 1 is activated by the start of energization of the device, the abnormality frequency Nr1 of the abnormality frequency integration function 7 is initialized to zero. As a result, when the microcomputer 1 is continuously energized, the number of abnormal times Nr1 is accumulated without being initialized, and operates when the microcomputer 1 continues to be used in the abnormal state. Therefore, if you continue to use without noticing the refrigeration cycle, the abnormality is detected and displayed, and the equipment is stopped, increasing the possibility of being noticed by the user and reducing the possibility of expansion damage. it can. Moreover, since it is necessary to stop energization of an apparatus once when using again, the expansion damage by reusing easily can be prevented.

(Embodiment 10)
As shown in FIG. 1 or 2, in the refrigeration cycle abnormality determination function 6 of the refrigeration cycle apparatus 106, an initialization function 9 is provided in the refrigeration cycle apparatus 106, and this initialization function 9 is operated from the outside of the apparatus. Since the user cannot operate the initialization function 9, the abnormality number Nr1 or Nr2 of the abnormality number accumulation function 7 is initialized at the time of shipment or when a repair worker repairs. Therefore, it is possible to reduce the possibility of expansion damage due to easy initialization by the user, and by performing initialization work to raise awareness of repair workers, repair errors are reduced, recurrence is prevented, and expansion damage is caused. The possibility of this can be reduced.

  In the present embodiment, in the refrigeration cycle abnormality determination function 6, the difference between the detected value Ta of the device ambient temperature sensor 2 and the detected value Te of the cooler temperature sensor 3 is 0 or less (Ta−Te ≦ 0) When the difference between the detected value Tb of the cooler intake air temperature sensor 10 and the detected value Te of the cooler temperature sensor 3 is 0 or less (Tb−Te ≦ 0), it is determined as an abnormal state. T0 may be set to (Ta−Te ≦ T0) or (Tb−Te ≦ T0) in consideration of errors and various ambient conditions. Further, this T0 may be set by Ta, Tb, or Te.

  In this embodiment, a dehumidifying device using a refrigeration cycle is used. However, a dehumidifying device using an inorganic adsorption type hygroscopic agent such as silica gel or zeolite, or a dehumidifying device using a combination of a refrigeration cycle and an adsorption type hygroscopic agent is used. May be.

  In addition, refrigerants for the refrigeration cycle include HCFC refrigerants (including chlorine, hydrogen, fluorine, and carbon atoms in the molecule), HFC refrigerants (including hydrogen, carbon, and fluorine atoms in the molecule), carbonization Hydrogen, carbon dioxide, or the like can be used.

  As described above, the refrigeration cycle apparatus according to the present invention is suitable for applications in which a protection control apparatus for a refrigeration cycle that has a simple configuration, reduces the possibility of erroneous detection, and reduces the possibility of expansion damage is desired. .

Configuration diagram of refrigeration cycle apparatus according to Embodiments 1, 6, 7, 8, and 10 of the present invention Same control flow diagram The block diagram of the refrigerating-cycle apparatus of Embodiment 2 of this invention Same control flow diagram Control flow diagram of Embodiment 3 of the present invention Control flow diagram of embodiments 4 and 5 of the present invention Control flow diagram of embodiment 9 of the present invention Configuration diagram of a refrigeration cycle apparatus according to a conventional embodiment Same control flow diagram Control flow diagram of other conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microcomputer 2 Apparatus ambient temperature sensor 3 Cooler temperature sensor 4 Refrigeration cycle abnormality display device 5 Compressor operation timer function 6 Refrigeration cycle abnormality determination function 7 Abnormal frequency accumulation function 8 Operation switch 9 Initialization function 10 Cooler intake air temperature sensor 20 Main body 101 Compressor 102 Radiator 103 Expander 104 Cooler 105 Blower 106 Refrigeration cycle apparatus

Claims (11)

A refrigeration cycle apparatus comprising a compressor, a radiator, an expander, a cooler and a blower provided in the main body, an ambient temperature detection means provided on the surface of the main body, and a cooler temperature detection for detecting the surface temperature of the cooler Means, and the detected temperature Ta of the ambient temperature detecting means and the detected temperature Te of the cooler temperature detecting means are calculated and determined to stop the operation of the refrigeration cycle apparatus, and the abnormality display means is operated to display an abnormality. When the refrigeration cycle apparatus is driven and controlled, the control unit determines the frequency when the detected temperature difference (Ta-Te) is smaller than the reference temperature difference T0. And an abnormality determination function for determining an abnormality when the cumulative number Nr1 is equal to or greater than the reference number N1, and a set stabilization time ts1 until the compressor is stably operated. Controller of the abnormality determination function comprising comprises a compressor timer function to operate the refrigeration cycle apparatus can. A refrigeration cycle device comprising a compressor, a radiator, an expander, a cooler and a blower provided in the main body, a cooler intake air temperature detection means provided on the suction side of the cooler, and a surface temperature of the cooler are detected. The operation of the refrigeration cycle apparatus is stopped by calculating and determining the detected temperature Tb of the cooler temperature detecting means, the detected temperature Tb of the cooler intake air temperature detecting means and the detected temperature Te of the cooler temperature detecting means, and abnormal A control unit for operating the display means to display an abnormality is displayed. When the refrigeration cycle apparatus is driven and controlled, the control unit has a temperature difference (Tb−Te) of the detected temperature smaller than a reference temperature difference T0. Is set as the number of times of integration Nr1, and an abnormality determination function for determining an abnormality when the number of times of integration Nr1 is equal to or greater than the reference number of times N1 and until the compressor is stably operated. Controller of the refrigeration cycle apparatus provided with not operated compressor timer function the abnormality determining function until a constant time ts1 has elapsed. 3. The refrigeration cycle apparatus according to claim 1, further comprising a second compressor timer function, wherein the control unit repeatedly performs a determination operation of performing the refrigeration cycle abnormality determination function within the time interval t <b> 0 after the stable time ts <b> 1 has elapsed. Control device. When the operating condition is changed by the control unit after the stabilization time ts1 has elapsed, the control unit operates the abnormality determination function until the set stabilization time ts2 until the compressor operates stably. 3. The control apparatus for a refrigeration cycle apparatus according to claim 1 or 2, further comprising a third compressor timer function for repeatedly performing a determination operation for performing a refrigeration cycle abnormality determination function within a time interval t0 thereafter. The control apparatus for the refrigeration cycle apparatus according to claim 3 or 4, wherein the time interval t0 set in the compressor timer function is set shorter than the stable time ts1 or ts2. The time interval t0 and the stabilization times ts1 and ts2 set by the compressor timer function are set shorter than the shortest defrosting transition time td set necessary for shifting to the defrosting operation. A control device for a refrigeration cycle apparatus according to claim 1. An operation switch for operating the operation of the refrigeration cycle apparatus is provided in the main body, and when the operation switch is operated, data of the number of abnormal times Nr1 stored in the control unit is initialized. The control apparatus of the refrigerating cycle apparatus of description. A power supply means for supplying power from a commercial power supply is provided, and when the energization is stopped via the power supply means, the data of the number of abnormal times Nr1 stored in the control unit is initialized. A control device for a refrigeration cycle apparatus according to claim 1. The control device for a refrigeration cycle apparatus according to any one of claims 1 to 6, wherein data of the number of abnormal times Nr1 stored in the control unit is retained even when energization to the refrigeration cycle apparatus is stopped. An abnormality display number Nr2 is added to the refrigeration cycle abnormality determination function, and the abnormality display number Nr2 is added to integrate the number of times abnormal display has been performed on the abnormality display means. The control of the refrigeration cycle apparatus according to any one of claims 1 to 9, wherein when the abnormality display count Nr2 becomes equal to or greater than a set value N2, the refrigeration cycle abnormality display means is displayed and the refrigerating cycle apparatus cannot be restarted. apparatus. The control device for a refrigeration cycle apparatus according to claim 9 or 10, wherein a function for initializing an abnormality count Nr1 or an abnormality display count Nr2 of the refrigeration cycle abnormality determination function is provided in the refrigeration cycle apparatus.

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