JP2005140409A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the efficiency of repair in a business refrigerator using a combustible refrigerant by detecting an abnormality such as refrigerant leak with an inexpensive and simple structure. <P>SOLUTION: This refrigerator comprises a refrigerant circuit abnormality determination means for determining a refrigerant circuit abnormality based on the differential temperature between the condensation temperature of the refrigerant detected by a condensation temperature detection means 20a and the outside air temperature detected by an outside air detection means 21a. The abnormality determination means detects the refrigerant leak by a low pressure-side refrigerant circuit abnormality determination means 22a which determines a low pressure-side refrigerant circuit abnormality in case of a differential temperature between the condensation temperature and the outside air temperature equal to or more than a predetermined value, and a high pressure-side refrigerant circuit abnormality determination means 23a which determines a high pressure-side refrigerant circuit abnormality in case of a differential temperature between the condensation temperature and the outside air temperature below the predetermined value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a refrigerator enclosing a combustible refrigerant.

  In recent years, a countermeasure against leakage of a flammable refrigerant in a refrigerator enclosing a flammable refrigerant is available (see, for example, Patent Document 1).

  Hereinafter, the conventional refrigerator will be described with reference to the drawings.

  FIG. 5 is a refrigeration system diagram of a conventional refrigerator, and shows a refrigerant circuit 43 in which a flammable refrigerant such as propane or isobutane is used as a refrigerant. That is, the refrigerant discharged from the compressor 13 passes through the condenser 14, the decompression mechanism 15, and the evaporator 6 in order, and repeats the refrigeration cycle that returns to the compressor 13 again. The latent heat of evaporation is taken through the fins, the air is cooled to cool air, and the inside of the refrigerator compartment (not shown) is cooled.

  On the downstream side of the passing air passing through the condenser 14 or the downstream side of the passing air passing through the evaporator 6, combustible refrigerant detection sensors 40 and 41 serving as refrigerant leakage detection means are provided.

Based on the detection signals input from the combustible refrigerant detection sensors 40 and 41 during the refrigeration cycle operation, the compressor 13 and the condenser cooling fan 16 are stopped, the alarm device provided separately is turned on, and the evaporator fan 7 is stopped, and the on-off valves 42 and 43 that are provided between the decompression mechanism 15 and the evaporator 6 and between the evaporator 6 and the compressor 13 and serve as refrigerant circuit shut-off means function.
JP-A-8-178481

  However, the conventional configuration requires an expensive flammable refrigerant detection sensor as a refrigerant leak detection means for preventing explosion and fire accident due to leakage of the flammable refrigerant.

  Furthermore, immediately after the flammable refrigerant leaks, the temperature in the refrigerator rises, which has a problem of adversely affecting stored items.

  In view of the above problems, an object of the present invention is to provide a refrigerator that detects leakage of a flammable refrigerant with an inexpensive and easy configuration, suppresses an increase in temperature in the refrigerator cabinet as much as possible, and has little deterioration in freshness of stored items. To do.

  The refrigerator of the present invention includes a refrigerant circuit that functionally connects a compressor, a condenser, a decompression mechanism, and an evaporator, encloses a combustible refrigerant, and a condenser that detects a condensation temperature of the refrigerant in the condenser. A temperature detection means; an outside air temperature detection means for detecting an outside air temperature; and a refrigerant circuit abnormality from a difference temperature between the condensation temperature of the refrigerant detected by the condensation temperature detection means and the outside air temperature detected by the outside air temperature detection means. The refrigerant circuit abnormality determining means for determining the refrigerant circuit, the condensation temperature becomes higher or lower than the normal time depending on the location of leakage, so that the refrigerant circuit is compared with the outside air temperature that is not affected by the leakage. Can be determined. In this way, an abnormality such as refrigerant leakage can be detected with a relatively inexpensive and easy configuration.

  As described above, the refrigerator of the present invention includes a refrigerant circuit that functionally connects a compressor, a condenser, a decompression mechanism, and an evaporator and encloses a combustible refrigerant, and condenses the refrigerant in the condenser. Condensation temperature detection means for detecting the temperature, outside air temperature detection means for detecting the outside air temperature, and a difference temperature between the condensation temperature of the refrigerant detected by the condensation temperature detection means and the outside air temperature detected by the outside air temperature detection means The refrigerant circuit abnormality determining means for determining that the refrigerant circuit is abnormal from the above, the refrigerant circuit has a relatively inexpensive and easy configuration that determines the abnormality of the refrigerant circuit from the difference between the condensing temperature and the outside air temperature. There is an effect that an abnormality can be detected.

  According to the first aspect of the present invention, a compressor, a condenser, a decompression mechanism, and an evaporator are functionally connected to each other, a refrigerant circuit in which a combustible refrigerant is enclosed, and a refrigerant in the condenser. Condensation temperature detection means for detecting the condensation temperature, outside air temperature detection means for detecting the outside air temperature, and the difference between the condensation temperature of the refrigerant detected by the condensation temperature detection means and the outside air temperature detected by the outside air temperature detection means Refrigerant circuit abnormality judging means for judging that the refrigerant circuit is abnormal from the temperature, and because the condensation temperature becomes higher or lower than the normal time depending on the leakage location, the outside air temperature not affected by the leakage By comparing, leakage of the refrigerant circuit can be determined. Thus, it has the effect | action that abnormality, such as a refrigerant | coolant leak, can be detected with a comparatively cheap and easy structure.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the refrigerant circuit abnormality determining means is the refrigerant condensing temperature detected by the condensing temperature detecting means and the outside air temperature detected by the outside air temperature detecting means. A low-pressure side refrigerant circuit abnormality determining means for determining that the low-pressure side refrigerant circuit is abnormal when the temperature difference between the refrigerant and the temperature is equal to or greater than a predetermined value; It is a high-pressure side refrigerant circuit abnormality determination means that determines if the refrigerant leaks from the high-pressure side piping, if the refrigerant circulation rate decreases, the condensing temperature becomes lower than normal and the condensing temperature approaches the outside air temperature. .

  Further, when the refrigerant leaks from the low-pressure side pipe, the pressure on the low-pressure side is equal to or lower than the atmospheric pressure, so air enters and stays in the condenser. For this reason, the condensation temperature rises as compared with the normal time. Thus, it can be determined whether the high-pressure side or the low-pressure side refrigerant circuit is abnormal from the temperature difference from the outside air temperature. Thus, it has the effect | action that abnormality, such as a refrigerant | coolant leak, can be detected with a comparatively cheap and easy structure.

  According to a third aspect of the present invention, in the second aspect of the present invention, when the low-pressure side refrigerant circuit abnormality determining means determines an abnormality of the low-pressure side refrigerant circuit, the low-pressure side refrigerant circuit abnormality notification is provided. And high pressure side refrigerant circuit abnormality notifying means for notifying abnormality when the abnormality of the high pressure side refrigerant circuit is determined by the high pressure side refrigerant circuit abnormality determining means. Therefore, the abnormal state is not left unattended.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the abnormality notification method of the low-pressure side refrigerant circuit abnormality notification means and the high-pressure side refrigerant circuit abnormality notification means is based on the light emitting means of different colors. Since it is configured, it is possible to visually determine an abnormal part, and depending on the use environment, there is an effect of not giving anxiety to the people around.

  According to a fifth aspect of the present invention, in the third aspect of the invention, the abnormality notification methods of the low-pressure side refrigerant circuit abnormality notification means and the high-pressure side refrigerant circuit abnormality notification means are arranged at different positions, respectively. Since it is composed of the light emitting means, it has the effect of being able to instantaneously determine whether the low-pressure side refrigerant circuit is abnormal or the high-pressure side refrigerant circuit is abnormal during repair in the event of an abnormality.

  The invention according to claim 6 of the present invention has a defrosting means for defrosting the evaporator, and the abnormality of the refrigerant circuit is determined by the low pressure side refrigerant circuit abnormality determination means or the high pressure side refrigerant circuit abnormality determination means. Since the compressor is operated continuously or intermittently, and the defrosting by the defrosting means is stopped, the rise in the temperature in the refrigerator is suppressed as much as possible for a while until the repair, and the stored item It has the effect of reducing the deterioration of freshness.

  The invention according to claim 7 of the present invention has a refrigerant circuit for refrigeration and a refrigerant circuit for refrigeration in the invention according to claim 6, and when an abnormality is detected in the refrigerant circuit for refrigeration, The compressor is operated continuously, and when the abnormality of the refrigerant circuit for refrigeration is detected, the compressor for refrigeration is intermittently operated. It has the effect that the deterioration of the freshness of stored items can be reduced by suppressing the rise of the internal temperature of both the rooms as much as possible and preventing the internal temperature of the refrigerator compartment from becoming excessively low.

  The invention according to claim 8 of the present invention has an internal temperature detecting means for detecting the internal temperature and an acoustic output means for outputting a sound or a buzzer sound, and the internal temperature is increased when the refrigerant circuit is abnormal. When it rises above the specified value, it is characterized by outputting a message such as “Please give food” or a buzzer sound, so the temperature in the refrigerator has risen to a temperature at which the freshness of the stored product cannot be maintained. This has the effect that it can be notified to the user.

  The invention according to claim 9 of the present invention has the refrigerant circuit for refrigeration and the refrigerant circuit for refrigeration in the invention according to claim 8, and the internal temperature preset in the event of an abnormality is a predetermined value in the refrigeration room Because the predetermined value of the freezer is lower than the temperature in the freezer, it is possible to notify the user that the temperature in the freezer compartment or the temperature in the refrigerator compartment has risen to a temperature at which the freshness of stored items cannot be maintained. Have

  According to a tenth aspect of the present invention, there is provided a refrigeration refrigerant circuit abnormality detecting means that has a refrigeration refrigerant circuit and a refrigeration refrigerant circuit and detects an abnormality of the refrigeration refrigerant circuit, and a refrigeration refrigerant circuit. When the abnormality of the refrigeration refrigerant circuit is detected, the refrigeration refrigerant circuit abnormality notification means for notifying the abnormality, the refrigeration refrigerant circuit abnormality detection means for detecting the abnormality of the refrigeration refrigerant circuit, and the abnormality of the refrigeration refrigerant circuit are determined. Since it is comprised by the refrigeration refrigerant circuit abnormality notification means which alert | reports abnormality, since it has for every refrigerant circuit, it has the effect | action that an abnormal refrigerant circuit can be specified.

  Hereinafter, embodiments of a refrigerator according to the present invention will be described with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Embodiment 1)
FIG. 1A is a front view of a refrigerator main body 1 according to Embodiment 1 of the present invention, and FIG. 1B is a sectional view, which is a commercial type refrigerator that is often used in stores and kitchens. The refrigerator according to the first embodiment is a four-door type with one room freezing and three room refrigeration. The upper right room has a freezer room 2 and the remaining three rooms are a refrigerated room 3. It is partitioned. The upper part of the refrigerator 1 is a machine room 5.

  The freezer compartment 2 is cooled by a freezing evaporator 6 and a freezing evaporator fan 7. The refrigeration evaporator 6 is connected to a refrigerant circuit 8 that is filled with a combustible refrigerant such as propane or isobutane and disposed in the machine room 5.

  On the other hand, the refrigerating chamber 3 is cooled by a refrigerating evaporator 9 and a refrigerating evaporator fan 10. The refrigeration evaporator 9 is connected to a refrigerant circuit 11 filled with a combustible refrigerant such as propane or isobutane and disposed in the machine room 5.

  Reference numeral 12 denotes display means to be described later, which displays the internal temperature and various abnormalities.

  FIG. 2 is a refrigeration system diagram of the refrigerator according to Embodiment 1 of the present invention. In the first embodiment, there are two independent refrigeration systems for refrigeration and refrigeration, and the configuration will be described with reference to a refrigeration system diagram for refrigeration. Note that the refrigeration system diagram for refrigeration has the same configuration as that for refrigeration and will not be described in detail.

  In the first embodiment, a flammable refrigerant such as propane or isobutane is used as the refrigerant, and the refrigerant discharged from the compressor 13 passes through the condenser 14, the decompression mechanism 15, and the evaporator 6 in this order, and again enters the compressor 13. By repeating the returning refrigeration cycle, the evaporator 6 takes the latent heat of evaporation from the surrounding air through the fins of the evaporator 6, cools the air by cooling it, and cools the interior. A refrigerant circuit is configured by connecting the compressor 13, the condenser 14, the decompression mechanism 15, and the evaporator 6 in an annular shape, and the high pressure side refrigerant circuit 17 extends from the compressor 13 through the condenser 14 to the inlet of the decompression mechanism 15. The low pressure side refrigerant circuit 18 extends from the decompression mechanism 15 to the compressor 13 through the evaporator 6.

  There is a condenser fan 16 that promotes heat exchange between the condenser 14 and air, and an evaporator fan 7 that promotes heat exchange between the evaporator and air. The defrosting means 19 for removing frost attached to the evaporator by cooling is constituted by a defrost heater.

  The condenser 14 is provided with a condensation temperature sensor that is a condensation temperature detection means 20 that detects the condensation temperature of the refrigerant, and an outside air temperature sensor that is an outside air temperature detection means 21 that detects the outside air temperature. Yes.

  The operation of the refrigerator of the first embodiment configured as described above will be described based on the control block diagram of FIG.

  In the first embodiment, since there are two independent refrigeration systems for refrigeration and refrigeration, there are also two control blocks for refrigeration and refrigeration in the control block, but the control block for refrigeration is the center. explain.

  In FIG. 3, the low pressure side refrigerant circuit abnormality determination means 22a inputs the condensation temperature detected by the condensation temperature detection means 20a and the outside air temperature detected by the outside air temperature detection means 21a. Determine if it is abnormal. That is, when the relationship of (condensation temperature−outside air temperature ≧ predetermined temperature) holds, it is determined that there is an abnormality. In the first embodiment, the predetermined temperature is set to 20 ° C. This predetermined temperature is set by experimental results in consideration of refrigerant characteristics and the like.

  In general, when scratches or the like occur in the low-pressure side piping, air enters and stays in the condenser because the pressure on the low-pressure side is equal to or lower than atmospheric pressure. For this reason, the condensing pressure and the condensing temperature rise as compared with the normal time.

  On the other hand, the high pressure side refrigerant circuit abnormality determination means 23a inputs the condensation temperature detected by the condensation temperature detection means 20a and the outside air temperature detected by the outside air temperature detection means 21a, and whether the low pressure side refrigerant circuit is normal or abnormal from this difference temperature. Determine. That is, when the relationship of (condensation temperature−outside air temperature ≦ predetermined temperature) holds, it is determined that there is an abnormality. In the first embodiment, the predetermined temperature is set to 2 ° C. This predetermined temperature is set by experimental results in consideration of refrigerant characteristics and the like, as in the case of the low-pressure side abnormality. Generally, when a flaw or the like occurs in the high-pressure side piping, the refrigerant leaks and the refrigerant circulation amount is reduced. For this reason, the condensing pressure and the condensing temperature are lowered as compared with the normal time.

The refrigeration refrigerant circuit abnormality detection means 24 includes a low-pressure side refrigerant circuit abnormality determination means 22a and a high-pressure side refrigerant circuit abnormality determination means 23a.

  The low pressure side refrigerant circuit abnormality notifying means 25a is composed of a green LED, and turns on the LED when the low pressure side refrigerant circuit abnormality determining means 22a determines a low pressure abnormality. The high-pressure side refrigerant circuit abnormality notifying means 26a is composed of an orange LED, and turns on the LED when a high-pressure abnormality is determined by the high-pressure side refrigerant circuit abnormality determining means 23a.

  The refrigeration refrigerant circuit abnormality notification means 27 includes a low-pressure side refrigerant circuit abnormality notification means 25a and a high-pressure side refrigerant circuit abnormality notification means 26a.

  The refrigeration compressor control means 28 controls the operation / stop of the compressor 13a so that the inside temperature detected by the freezer compartment temperature detecting means 29 comprising a temperature sensor becomes a set temperature when it is normal. Further, when the defrost control means 30a is normal, if the integration timer 31a for integrating the operation time of the compressor 13a reaches 8 hours, the defrost control means 30a is energized to the defrosting means 19a composed of a defrost heater and is attached to the evaporator 6 Remove.

  On the other hand, when the abnormality of the refrigerant circuit is detected by the low pressure side refrigerant circuit abnormality determination means 22a or the high pressure side refrigerant circuit abnormality determination means 23a, an abnormality signal is sent to the refrigeration compressor control means 28 and the defrost control means 30a. The refrigeration compressor control means 28 that has received the abnormal signal switches the compressor 13a to the continuous operation, and the defrost control means 30a stops the defrosting (the defrosting is not performed even if the integrated time reaches 8 hours).

  The frozen food acoustic output control means 32 detects the abnormality of the refrigerant circuit by the low-pressure side refrigerant circuit abnormality determination means 22a or the high-pressure side refrigerant circuit abnormality determination means 23a, and the warehouse detected by the freezer compartment temperature detection means 29. When the internal temperature exceeds a predetermined value (−5 ° C. in the present embodiment), an audio signal is transmitted to the sound output means 33 and an audio message “Please output food in the freezer compartment” is output.

  Next, the control block for refrigeration will be described. The same components as those in the control block for refrigeration are given the same numbers (the refrigeration and the refrigeration are distinguished by alphabets a and b), and the detailed description is omitted.

  The refrigeration refrigerant circuit abnormality detection means 34 includes a low-pressure side refrigerant circuit abnormality determination means 22b and a high-pressure side refrigerant circuit abnormality determination means 23b, as in the case of freezing. The refrigeration refrigerant circuit abnormality notifying unit 35 includes a low-pressure side refrigerant circuit abnormality notifying unit 25b and a high-pressure side refrigerant circuit abnormality notifying unit 26b.

  The refrigeration compressor control means 36 controls the operation / stop of the compressor 13b so that the inside temperature detected by the inside temperature detection means 37 comprising a temperature sensor becomes the set temperature when normal.

  On the other hand, when the abnormality of the refrigerant circuit is detected by the low-pressure side refrigerant circuit abnormality determination unit 22b or the high-pressure side refrigerant circuit abnormality determination unit 23b, an abnormality signal is sent to the refrigeration compressor control unit 36 and the defrost control unit 30b. The refrigeration compressor control means 36 that has received the abnormal signal switches the compressor 13b to intermittent operation, and the defrost control means 30b stops defrosting (it does not perform defrosting even if the integration time reaches 8 hours).

The refrigerated food acoustic output control means 38 detects the refrigerant circuit abnormality by the low-pressure side refrigerant circuit abnormality determination means 22b or the high-pressure side refrigerant circuit abnormality determination means 23b, and also detects it by the refrigerator temperature detection means 37. When the inside temperature exceeds a predetermined value (20 ° C. in the present embodiment), an audio signal is transmitted to the acoustic output means 33, and an audio message “Please output food in the refrigerator” is output.

  Next, the structure of the display means 12 in Embodiment 1 of the present invention will be described with reference to FIG.

  As shown in the figure, the display means 12 is configured to display the left side separately from the freezer compartment relationship and the right side from the refrigerator compartment relationship.

  Refrigerant circuit abnormality notifying means 27 is arranged beside the digital display 39a for displaying the freezer compartment temperature. The refrigerant circuit abnormality notification means 27 includes a refrigeration low-pressure side refrigerant circuit abnormality notification means 25a configured by a green LED, and a refrigeration high-pressure side refrigerant circuit abnormality notification means 26a configured by an orange LED. Two LEDs of different colors are arranged at the upper and lower positions.

  The display related to the right refrigeration room has the same configuration as the display related to the freezer compartment, and a detailed description thereof will be omitted. 33 is an acoustic output means for outputting a voice message, and is constituted by a speaker.

  As described above, in the refrigerator according to the present embodiment, the difference temperature between the refrigerant condensing temperature detected by the condensing temperature detecting means 20 and the outside air temperature detected by the outside air temperature detecting means 21 is not more than a predetermined value (2 ° C.). In this case, it is provided with high-pressure side refrigerant circuit abnormality determining means 23a and 23b that determine that the refrigerant circuit is abnormal, so that a relatively inexpensive and easy configuration of determining abnormality of the refrigerant circuit from the difference temperature between the condensation temperature and the outside air temperature is provided. Thus, an abnormality such as refrigerant leakage can be detected.

  Further, when the difference temperature between the condensation temperature and the outside air temperature is equal to or higher than a predetermined value (20 ° C.), the low pressure side refrigerant circuit abnormality determining means 22a and 22b for determining that the low pressure side refrigerant circuit is abnormal, Since the high-pressure side refrigerant circuit abnormality determining means 23a, 23b that determines that the high-pressure side refrigerant circuit is abnormal when it is equal to or lower than a predetermined value (2 ° C.), the high-pressure side refrigerant circuit and the low-pressure side refrigerant are determined from the condensation temperature and the outside air temperature. Abnormalities such as refrigerant leakage can be detected with a relatively inexpensive and easy configuration of determining circuit abnormality.

  Also, low pressure side refrigerant circuit abnormality notifying means 25a and 25b for notifying abnormality when the abnormality of the low pressure side refrigerant circuit is determined, and high pressure side refrigerant circuit abnormality notification for notifying abnormality when the abnormality of the high pressure side refrigerant circuit is determined. Since the means 26a and 26b are provided, it is possible to determine whether the low-pressure side refrigerant circuit is abnormal or the high-pressure side refrigerant circuit is abnormal when repairing at the time of abnormality, so that the efficiency of the repair is high.

  The low-pressure side refrigerant circuit abnormality notifying means 25a, 25b is composed of a green LED, while the high-pressure side refrigerant circuit abnormality notifying means 26a, 26b is composed of an orange LED. At this time, it can be instantaneously determined whether the low-pressure side refrigerant circuit is abnormal or the high-pressure side refrigerant circuit is abnormal.

  Further, since the LEDs of the low-pressure side refrigerant circuit abnormality notifying means 25a and 25b and the LEDs of the refrigerant circuit abnormality notifying means 26a and 26b are arranged apart from each other, the low-pressure side refrigerant circuit abnormality notifying means It is possible to instantaneously determine whether the side refrigerant circuit is abnormal or the high-pressure side refrigerant circuit is abnormal.

  In addition, when it is determined that the refrigerant circuit for freezing is abnormal, the compressor 13a is continuously operated and the defrosting by the defrosting means 19a is stopped. The rise is suppressed as much as possible, and the deterioration of freshness of stored items can be reduced.

In addition, when a refrigerant circuit for refrigeration and a refrigerant circuit for refrigeration are detected and an abnormality in the refrigerant circuit for refrigeration is detected, the compressor for refrigeration 13a is continuously operated and an abnormality in the refrigerant circuit for refrigeration is detected Since the refrigeration compressor 13b is intermittently operated, the temperature inside the freezer compartment and the refrigerator compartment is suppressed as much as possible for a while until the repair, and the inside temperature of the refrigerator compartment is not excessively lowered. Thus, the freshness deterioration of the stored product can be reduced.

  Moreover, it has the freezer compartment internal temperature detection means 29 which detects the temperature in a freezer compartment, and the acoustic output means 33 which outputs an audio | voice, and internal temperature is more than predetermined value (-5 degreeC) at the time of abnormality of a refrigerant circuit. When the temperature rises, the voice message “Please put out food in the freezer” is output, so the user is informed that the temperature inside the freezer has risen to a temperature at which the freshness of the stored item cannot be maintained. it can. In this embodiment, a voice message is output. However, the same effect can be obtained by a structure that simply outputs a buzzer sound for issuing a warning.

  Moreover, since it has a refrigerant circuit for freezing and a refrigerant circuit for freezing, and the predetermined value (−5 ° C.) of the freezing room is set to a temperature lower than the predetermined value (20 ° C.) of the freezing room, the freezing room It is possible to notify the user that the internal temperature or the internal temperature of the refrigerator compartment has risen to a temperature at which the freshness of stored items cannot be maintained.

  The refrigerant circuit for refrigeration has a refrigerant circuit for refrigeration and a refrigerant circuit for refrigeration. When the abnormality in the refrigerant circuit for refrigeration is detected, the refrigerant circuit abnormality notification means 27 for notifying the abnormality and the abnormality in the refrigerant circuit for refrigeration are detected. In this case, the refrigeration refrigerant circuit abnormality notifying means 35 for notifying abnormality is constituted, so that it is possible to determine whether the refrigerant circuit for refrigeration or the refrigerant circuit for refrigeration is abnormal when repairing at the time of abnormality. So repair efficiency is good.

  As described above, the refrigerator of the present invention can detect abnormalities such as refrigerant leakage with a relatively inexpensive and easy configuration in which the abnormality of the refrigerant circuit is determined from the difference between the condensation temperature and the outside air temperature. It can be widely applied to refrigeration and air conditioning equipment with a refrigeration cycle that uses flammable refrigerant.

Front view and sectional view of the refrigerator according to Embodiment 1 of the present invention. Refrigeration system diagram of refrigerator according to Embodiment 1 of the present invention Control block diagram of refrigerator according to embodiment 1 of the present invention The display block diagram of the refrigerator by Embodiment 1 of this invention Refrigeration system diagram of conventional refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Freezing room 3 Refrigeration room 6 Evaporator 13 Compressor 14 Condenser 15 Depressurization mechanism 19 Defrosting means 20 Condensation temperature detection means 21 Outside air temperature detection means 22 Low pressure side refrigerant circuit abnormality determination means 23 High pressure side refrigerant circuit abnormality determination means 24 Refrigeration refrigerant circuit abnormality detection means 25 Low pressure side refrigerant circuit abnormality notification means 26 High pressure side refrigerant circuit abnormality notification means 27 Refrigeration refrigerant circuit abnormality notification means 34 Refrigeration refrigerant circuit abnormality detection means 35 Refrigeration refrigerant circuit abnormality notification means 29, 37 Chamber temperature detection means 33 Sound output means

Claims (10)

  A compressor, a condenser, a decompression mechanism, and an evaporator functionally connected to each other, a refrigerant circuit enclosing a combustible refrigerant, a condensation temperature detecting means for detecting a condensation temperature of the refrigerant in the condenser, and outside air Outside air temperature detecting means for detecting temperature, and refrigerant circuit abnormality determination for determining a refrigerant circuit abnormality from a difference temperature between the refrigerant condensing temperature detected by the condensation temperature detecting means and the outside air temperature detected by the outside air temperature detecting means And a refrigerator.   The refrigerant circuit abnormality determining means determines the low-pressure side refrigerant circuit abnormality when the difference between the refrigerant condensing temperature detected by the condensation temperature detecting means and the outside air temperature detected by the outside air temperature detecting means is equal to or greater than a predetermined value. 2. The refrigerant circuit abnormality determining means and the high pressure side refrigerant circuit abnormality determining means for determining that the high pressure side refrigerant circuit is abnormal when the difference temperature between the condensing temperature and the outside air temperature is a predetermined value or less. Refrigerator.   When the abnormality of the low-pressure side refrigerant circuit is determined by the low-pressure side refrigerant circuit abnormality determination means, and when the abnormality of the high-pressure side refrigerant circuit is determined by the low-pressure side refrigerant circuit abnormality notification means and the high-pressure side refrigerant circuit abnormality determination means The refrigerator according to claim 2, further comprising high-pressure side refrigerant circuit abnormality notifying means for notifying abnormality.   4. The refrigerator according to claim 3, wherein the abnormality notification methods of the low-pressure side refrigerant circuit abnormality notification means and the high-pressure side refrigerant circuit abnormality notification means are configured by light emitting means of different colors.   4. The refrigerator according to claim 3, wherein the abnormality notification methods of the low-pressure side refrigerant circuit abnormality notifying means and the high-pressure side refrigerant circuit abnormality notifying means are constituted by light emitting means arranged at different positions, respectively.   A defrosting means for defrosting the evaporator, and when the refrigerant circuit abnormality is judged by the low pressure side refrigerant circuit abnormality judging means or the high pressure side refrigerant circuit abnormality judging means, the compressor is operated continuously or intermittently, The refrigerator according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the defrosting by the frosting means is stopped.   When the refrigerant circuit for refrigeration and the refrigerant circuit for refrigeration are detected, and the abnormality in the refrigerant circuit for refrigeration is detected, the compressor for refrigeration is continuously operated, and when the abnormality in the refrigerant circuit for refrigeration is detected The refrigerator according to claim 6, wherein the refrigerator for refrigeration is intermittently operated.   If the internal temperature rises above a predetermined value when the refrigerant circuit is abnormal, the internal temperature detection means for detecting the internal temperature and the acoustic output means for outputting sound or buzzer sound are provided. The refrigerator according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, or claim 7.   9. A freezing refrigerant circuit and a refrigeration refrigerant circuit are provided, and the internal temperature set in advance in the event of an abnormality is a temperature lower than a predetermined value in the freezer compartment than a predetermined value in the refrigerator compartment. Refrigerator.   A refrigeration refrigerant circuit abnormality detecting means for detecting an abnormality of the refrigeration refrigerant circuit, a refrigeration circuit having a refrigeration refrigerant circuit and a refrigeration refrigerant circuit, and a refrigeration for notifying an abnormality when an abnormality of the refrigeration refrigerant circuit is detected Refrigerant circuit abnormality notifying means, refrigeration refrigerant circuit abnormality detecting means for detecting abnormality of the refrigeration refrigerant circuit, and refrigeration refrigerant circuit abnormality notifying means for notifying abnormality when determining abnormality of the refrigeration refrigerant circuit; A refrigerator characterized by comprising.

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