JP6692675B2 - Air conditioner outdoor unit - Google Patents

Description

  The present invention relates to an outdoor unit of an air conditioner, and is particularly suitable for detecting abnormality of a fan of a blower used in the outdoor unit and improving reliability.

  Generally, in an air conditioner for a building or a small refrigerator, heat is exchanged between the refrigerant and the outdoor air.Therefore, a cross fin tube type heat exchanger is used for the outdoor unit of the air conditioner and the outdoor unit of the small refrigerator. Air-cooled heat exchangers such as vessels and microchannel heat exchangers are provided. Further, by ventilating the outdoor air to these heat exchangers, a blower for exchanging heat between the refrigerant flowing in the heat exchanger and the outdoor air is also provided, and the blower is the amount of air ventilated to the heat exchanger. The number of revolutions is controlled by an inverter or the like so that the speed can be increased or decreased. Further, in order to improve the efficiency of the blower, the fan has a complicated curved surface shape and is often manufactured by a resin molded product.

  The fan of the blower may collide with the fan due to icicles falling in winter, and foreign bodies being blown off by typhoons in summer. Although the blower is designed in consideration of the impact such as a falling object on the fan, the peripheral speed of the outer peripheral side of the fan is as high as about 100 km / h, so that the fan made of a resin material has a high peripheral speed. There is a limit to how much damage can be prevented, and damage such as a missing fan can occur.

  When the degree of damage to the fan or the like in the blower of the outdoor unit is large, the air volume greatly decreases, so that an abnormality occurs in the refrigeration cycle, and therefore abnormality in the blower can be detected relatively easily. However, when the degree of damage to the fan or the like is small, the amount of air flow is large to some extent, and it is difficult to detect an abnormality from the refrigeration cycle side.

  The blower rotates in a well-balanced state under normal conditions, but if the fan continues operating with little damage to the fan, the center of gravity of the fan may shift from the center of the rotation axis due to effects such as missing fans. Then, the operation is performed in a state where the balance of the rotating body is lost (unbalanced state). This imbalance acts as a vibrating force, which causes large vibrations in the outdoor unit, and repeated stress causes damage to other parts of the outdoor unit.In the worst case, the heat exchanger and piping may be damaged. is there. In such a state, continuous operation of the air conditioner becomes impossible, and it takes a lot of time and cost to restore the air conditioner.

  Therefore, in Japanese Unexamined Patent Application Publication No. 2014-212143 (Patent Document 1), an abnormality of the blower is diagnosed based on an output from a vibration detection unit that detects vibration of the blower, and the operation of the blower is stopped. There is.

JP, 2014-212143, A

  In Patent Document 1 described above, the abnormality of the blower is diagnosed based on the output from the vibration detection unit that detects the vibration of the blower. As the vibration detecting means, for example, an acceleration sensor is used, and it is possible to detect an abnormality by detecting the vibration of the blower in an unbalanced state. However, since the output of the acceleration sensor is proportional to the loss amount of the fan and to the square of the fan rotation speed, the accuracy of abnormality detection is good in the range where the blower is operated at a high rotation speed.

  However, when the air-conditioning load is small, such as in spring or autumn, the blower of the outdoor unit is often operated at a low rotation speed, which makes it difficult to detect an abnormality in the fan of the blower. For this reason, it is desired that the air-conditioning load is small and the blower abnormality can be detected even when the blower is operated in an intermediate rotation speed range or a low rotation speed range.

  Further, it is desirable that a user or a service person can easily recognize the abnormality from an early stage of the abnormality of the blower and prevent the situation of the blower from deteriorating.

  An object of the present invention is to obtain an outdoor unit for an air conditioner that can easily detect an abnormality in a fan of the outdoor unit from a mild stage.

  Another object of the present invention is to obtain an outdoor unit for an air conditioner that is inexpensive and can detect a fan abnormality from a state where the fan rotation speed is low.

  To achieve the above object, the present invention relates to an outdoor unit of an air conditioner including an outdoor unit having a fan, the vibration detecting unit detecting the vibration of the fan, and the magnitude of the vibration obtained by the vibration detecting unit. And a calculation unit that determines which of the predetermined multi-step vibration levels corresponds to the vibration level, and which of the multi-step vibration levels the vibration magnitude corresponds to And a display unit that visually displays the magnitude of the vibration level obtained by the calculation unit so that it can be visually recognized as to which of the vibration levels among the multi-stage vibration levels, It is characterized in that it is provided with an output section for displaying on the section.

  Another feature of the present invention is an outdoor unit of an air conditioner including an outdoor unit having a fan, the inverter device having a current detection unit that controls the rotation speed of the fan and detects a drive current of the fan. A pulsating current extracting means for extracting a pulsating current of a component synchronized with the rotation of the fan from a current value detected by the current detecting portion provided in the inverter device; and a pulsating current extracting means for extracting the pulsating current. Further, there is provided an arithmetic unit that determines an abnormality of the fan from the pulsating current and the rotation speed of the fan, and an output unit that outputs a determination result of the abnormality of the fan by the arithmetic unit.

  According to the present invention, there is an effect that it is possible to obtain an outdoor unit of an air conditioner in which an abnormality of a fan of an outdoor unit can be easily grasped from a mild stage.

  Further, according to the present invention that uses the current value from the current detection unit provided in the inverter device, it is possible to obtain the outdoor unit of the air conditioner that is inexpensive and can detect the abnormality of the fan even when the fan rotation speed is low. There is an effect that can be.

The perspective view which shows Example 1 of the outdoor unit of the air conditioning apparatus of this invention. II-II sectional view taken on the line in FIG. FIG. 3 is a diagram illustrating a configuration for detecting a fan abnormality according to the first embodiment of the present invention. FIG. 5 is a diagram showing a relationship between a pulsating current amplitude value and a fan rotation speed. FIG. 6 is a diagram showing a relationship between a fan excitation force and a fan rotation speed. FIG. 6 is a diagram showing a relationship between a product of a pulsating current amplitude value and a fan rotation speed and a fan rotation speed. 3 is a flowchart illustrating a flow of fan abnormality detection according to the first embodiment. FIG. 3 is a front view illustrating the configuration of the remote controller that is the output unit in the first embodiment. The front view explaining the other example of the remote control shown in FIG. FIG. 6 is a diagram illustrating a configuration for detecting a fan abnormality according to the second embodiment of the present invention. 9 is a flowchart illustrating a flow of fan abnormality detection according to the second embodiment. The perspective view explaining the example of composition of the heat exchanger of the outdoor unit in Example 3 of the present invention.

  Hereinafter, specific examples of the outdoor unit of the air conditioner of the present invention will be described with reference to the drawings. The outdoor unit of the air conditioner of the present invention is particularly characterized by detecting an abnormality in the fan of the outdoor unit and displaying the abnormality level. In addition, in each drawing, the parts given the same reference numerals indicate the same or corresponding parts.

Example 1 of the outdoor unit of the air conditioner of the present invention will be described with reference to FIGS. 1 to 9.
1 is a perspective view showing a first embodiment of an outdoor unit of an air conditioner of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 shows a fan abnormality in the first embodiment of the present invention. It is a figure explaining the structure which detects.

  The air conditioner is a refrigeration cycle in which an outdoor unit 100 installed on an outdoor foundation (or a gantry) 20 and one or more indoor units (not shown) installed indoors are connected by a refrigerant pipe. And air conditioning. As shown in FIGS. 1 and 2, the outdoor unit 100 is provided with an air-cooled heat exchanger 2 in a housing 1 and a blower 3 (3A, 3B) for ventilating the heat exchanger 2. There is. The example of the outdoor unit 100 shown in FIG. 1 includes two blowers 3A and 3B.

  The blowers 3A and 3B are a fan (propeller fan) 3a, a shroud 3b provided on the outer periphery of the fan 3a and functioning as a bell mouth or a duct, a motor (fan motor) 3c for driving the fan 3a, and this motor. It is configured by a motor support member 3d that supports 3c, a fan guard 3e, and the like.

  Further, a compressor 4, an accumulator 5, a control product box 6 and the like are provided inside the housing 1. Information from various sensors such as an outside air temperature sensor and a pressure sensor of a refrigeration cycle is input into the control product box 6 to control refrigeration cycle parts such as the compressor 4 and an expansion valve (not shown). A control device, an inverter device for controlling the blower 3, and the like are housed.

  As shown in FIG. 3, an inverter device 6a for driving the motor (fan motor) 3c of the blower 3 and controlling the motor 3c at a desired rotation speed is provided inside the control product box 6. A control device 6b for controlling the refrigeration cycle 7 including the compressor 10, the expansion valve, the various sensors, and the like is provided.

  The inverter device 6a is provided with a current detector 61 that detects a drive current (motor current) that drives the fan 3a, and a phase detector 62 that detects a magnetic pole position of the motor 3c. In addition, the inverter device 6a extracts a q-axis current pulsation (pulsation current) of a certain cycle in synchronization with the rotation cycle obtained from the phase detection unit 62, with respect to the current detected by the current detection unit. A pulsating current detector 63 is provided.

  Further, the inverter device 6a is also provided with a calculation unit 64 that determines an abnormality of the fan 3a from the pulsating current detected by the pulsating current detecting unit 63 and the rotation speed of the fan. That is, in the present embodiment, the arithmetic unit 64 multiplies the amplitude value of the pulsating current (pulsating current amplitude value) by the rotation speed of the fan, and determines the abnormality of the fan 3a from the multiplied value. ing.

  The calculation unit 64 uses not only a calculated value obtained by multiplying the pulsating current amplitude value by the fan rotation speed, but also a calculated value obtained by multiplying the pulsating current value (for example, the maximum pulsation current value) by the fan rotation speed. May be used to determine the abnormality of the fan 3a.

  The control device 6b is connected to the arithmetic unit of the inverter device 6a by a communication line or the like. Further, a storage device 6c connected to the control device 6b is provided in the control product box 6, and the storage device 6c is configured to be able to store the result of determining the abnormality of the fan 3a. There is.

  In the present embodiment, the output unit 8 is composed of an operation remote controller 81 for operating the air conditioner, and is connected to the control device 6b by a communication line. Therefore, in this embodiment, the result of the abnormality determination of the fan 3a in the arithmetic unit 64 is output to the operation remote controller 81 which is the output unit 8 via the control device 6b, and the determination result and the like are displayed on the display unit 81a. Can be displayed.

  The past fan abnormality determination history of the fan 3a stored in the storage device 6c can also be displayed on the display unit 81a of the operation remote controller 81, which is an output unit, via the control device. Is configured.

  If the control device 6b is provided with a transmitting means for transmitting the data of the vibration level output to the output unit to the outside, the vibration level or abnormality of the fan 3a can be received from an external remote monitoring system or a personal computer. The occurrence can be understood.

  Next, a pulsating current amplitude value of a drive current when a normal fan and a fan in which a rotation imbalance occurs due to a part of the fan being lost or the like is rotated by the motor 3c, Exciting force generated in the fan will be described with reference to FIGS. 4 and 5.

  FIG. 4 is a diagram showing the relationship between the pulsating current amplitude value and the rotational speed of the fan, and FIG. 5 is a diagram showing the relationship between the fan excitation force and the rotational speed of the fan.

  In FIG. 4, the horizontal axis represents the fan rotation speed, and the vertical axis represents the pulsating current amplitude value of the fan drive current. The curve indicated by A is the pulsating current amplitude value with respect to the normal fan speed, the broken line curve with B1 is the pulsating current amplitude value with respect to the fan speed with a small unbalance, and the broken curve curve B2 is a large unbalance. The pulsating current amplitude value with respect to the rotation speed of the fan is shown. Further, D1 is the difference in the amplitude value of the fan B1 having a small unbalance with respect to the normal fan A in the high rotation range, and D2 is the difference of the amplitude value of the fan B2 having the large unbalance with respect to the normal fan A in the high rotation range.

  As shown in FIG. 4, between the normal fan A and the fans B1 and B2 in which the rotational imbalance occurs due to a partial defect or the like, a difference in the pulsating current amplitude value with respect to the rotational speed is observed, and the imbalance is large. Since the pulsating current amplitude value of the fan B2 is significantly different from that of the normal fan, the normal / abnormal determination can be easily performed even at a relatively low rotation speed. On the other hand, in the unbalanced fan B1, the pulsating current amplitude value has a smaller difference compared to the normal fan, and it is difficult to determine normal / abnormal unless the fan B1 is operated at a high rotation speed.

Further, it can be seen that the pulsating current amplitude value shown in FIG. 4 increases with the increase of the rotation speed up to a certain number of rotations, but the increasing range of the pulsation current amplitude value becomes dull in the high rotation range.
Here, the relationship between the fan excitation force and the fan rotation speed due to the occurrence of imbalance will be described with reference to FIG. In FIG. 5, the horizontal axis represents the rotation speed of the fan, and the vertical axis represents the fan excitation force. Further, the curves indicated by A, B1 and B2 are fan exciting forces with respect to the rotational speeds of the normal fan A, the small unbalanced fan B1 and the large unbalanced fan B2, respectively, as in FIG.

  As shown in FIG. 5, the vibration force generated by the rotation of the fan is proportional to the square of the rotation speed of the fan. Further, the vibration amplitude and stress generated in the motor supporting member 3d and the housing 1 of the outdoor unit due to the fan exciting force tend to be substantially proportional to the exciting force, and are approximately the square of the fan rotation speed. Proportional. For this reason, the higher the rotational speed shown in FIG. 4, the greater the influence on the vibration and stress due to the imbalance of the fan.

  On the other hand, as shown in FIG. 4 described above, the change in the pulsating current amplitude value due to the occurrence of fan imbalance is not sufficiently high in correlation with the vibration amplitude and stress generated by the fan exciting force shown in FIG. .. Therefore, as the index used for detecting the abnormality of the fan, it is desirable to use an index having a higher correlation with the vibration amplitude and stress generated by the fan exciting force than the pulsating current amplitude value shown in FIG. That is, if the fan abnormality or the vibration level is determined using an index having a higher correlation with the vibration amplitude or stress generated by the fan excitation force, the fan abnormality can be determined with high accuracy. It is possible to more reliably prevent the heat exchanger, the piping, the other parts, and the like from being damaged.

  Therefore, in the present embodiment, as described with reference to FIG. 3, the pulsating current amplitude value obtained from the pulsating current detecting unit 63 is not used as it is for the determination of the abnormality or the vibration level of the fan 3a, but the following measures are taken. Are doing That is, a calculation unit 64 that multiplies the fan rotation speed obtained from the phase detection unit 62 (pulsation current amplitude value x rotation speed) is provided, and the calculation result (calculated value) of this calculation unit 64 is used to control the air conditioner. The abnormality determination or the vibration level determination of the fan 3a is performed by passing it over to the controlling device 6b.

  As shown in FIG. 3, the arithmetic unit 64 in the inverter device 6a is not limited to the one that performs the abnormality determination or the vibration level determination of the fan 3a, or the function of the arithmetic unit 64 is the same as that of the control device. It may be provided in the arithmetic unit provided in 6b.

  In the present embodiment, the calculation unit 64 calculates “pulsation current amplitude value × rotation speed”. The characteristics of this calculated value will be described with reference to FIG. FIG. 6 is a diagram showing a relationship between the product of the pulsating current amplitude value and the fan rotation speed and the fan rotation speed. Further, in FIG. 6, the horizontal axis represents the fan rotation speed, and the vertical axis represents the calculated value of “pulsating current amplitude value × revolution speed”. Further, the curve indicated by A is the calculated value with respect to the rotational speed of the normal fan, and the curve indicated by the broken line indicated by B is an unbalanced fan, and in this example, an unbalanced fan B1 having the same unbalance as shown in FIG. It is the calculated value for the rotational speed of the fan with a balance.

  As shown in FIG. 6, the calculated value of “pulsating current amplitude value × rotation speed” with respect to the rotation speed of the fan becomes closer to the relationship of the fan excitation force with respect to the rotation speed described in FIG. 5, and in FIG. The difference D1 ′ between the calculated values shown in FIG. 6 is significantly larger than the difference D1 between the amplitude values of the unbalanced small fan B1 in the high rotation range with respect to the normal fan A.

  Therefore, according to the present embodiment, it becomes possible to perform the abnormality determination or the vibration level determination of the fan 3a with higher accuracy, and the heat exchanger 2, the piping, and other parts of the outdoor unit 100 are damaged. Can be more reliably prevented. The determination result of the fan abnormality or the like in the arithmetic unit 64 shown in FIG. 3 or the arithmetic unit of the control device 6b is displayed on the display unit 81a of the output unit 8 shown in FIG.

  According to the present embodiment, the vibration level can be determined and the display 81a and the like can be notified from an early stage where the rotation speed is low and the vibration level is small, so that the preventive maintenance such as the outdoor unit damage can be reliably performed. Is obtained.

  When a fan abnormality is detected, the operation is stopped for inspection or the like, but if the operation is stopped frequently, there are many inconveniences in actual operation. Therefore, it is desirable to be able to continue operation at an allowable vibration level while having information on preventive maintenance. According to the present embodiment, the abnormality or the vibration level is determined by the index having a high correlation with the vibration amplitude or the stress generated in the motor support member 3d or the housing 1 of the outdoor unit by the excitation force due to the unbalance of the fan. Highly accurate determination is possible, and continuous operation is possible when the vibration level is below a certain level, and operation is stopped when the vibration level is above a certain level, which allows efficient operation of the outdoor unit and serious damage to the outdoor unit. Can also be prevented.

  Next, the flow of fan abnormality detection in this embodiment will be described with reference to the flowchart of FIG. 7 and with reference to FIG. It should be noted that in the present embodiment, the abnormality detection includes not only the case where the fan becomes abnormal and it is necessary to stop it, but also the detection of the vibration level due to the imbalance of the fan.

  In FIG. 7, first, the operation start of the outdoor unit is prepared by the operation start command received from the operation remote controller 81 in the room. Note that in the flowchart of FIG. 7, only the operating portion of the blower 3 of the outdoor unit is described, and description of the control of the refrigeration cycle 7 is omitted. After the operation start command, the operation of the outdoor unit blower 3 by the inverter device 6a is started (step S1). Next, in step S2, the drive current (motor current) of the motor 3c of the blower 3 is detected by the current detection unit (current sensor) 61 of the inverter device 6a.

  In the next step S3, the amplitude value of the current ripple is calculated by the ripple current detector 63. That is, the pulsating current amplitude value is calculated by extracting the component synchronized with the rotation cycle of the fan 3a from the current value detected by the current detection unit 61.

  Next, in step S4, the calculating unit 64 calculates and calculates the product of the pulsating current amplitude value and the rotation speed of the fan 3a (pulsating current amplitude value × rotation speed), and from the calculated value, the fan 3a. The vibration level (abnormal level) of is determined. For example, the vibration level is determined to be determined in six stages, the relationship between the calculated value and the vibration level is determined in advance, the vibration level corresponding to the magnitude of the calculated value is determined, and this determination is performed. The vibration level is displayed on the display unit 81a of the output unit 8 (step S5).

  The display on the display unit 81a may be visually changed according to the determined vibration level. If the determined vibration level exceeds the first threshold, an alarm is displayed. For example, the first threshold is set to the vibration level 3, and when the determined vibration level becomes 3 or more, an alarm is displayed on the display unit 81a or the like.

  Although the output unit 8 is the operation remote controller 81 for operating the indoor unit in the present embodiment, it is a display device on the control board of the outdoor unit 100 (this display device is composed of a 7-segment LED, a liquid crystal panel, or the like). ), A building monitoring system, a personal computer, or various devices such as a communication line, a wireless LAN, and a device connected by Bluetooth (registered trademark).

  After step S5, the process proceeds to step S6, and a second threshold value set in advance to determine the abnormality of the fan 3a is compared with the determined vibration level. The second threshold is a value larger than the first threshold, and for example, the vibration level is 5 or higher. If the vibration level is lower than the second threshold value, it is determined to be in the normal level category, the abnormal state duration timer is reset (step S9), and the process returns to step S2.

  In step S6, when the vibration level is equal to or higher than the second threshold value, the abnormal state duration timer is counted up (step 7). Next, in step S8, the value of the duration timer is compared with a third threshold that is a predetermined duration, and the vibration level is equal to or greater than the second threshold and the duration is less than the third threshold. If so, the process returns to step S2.

  If the value of the duration timer is equal to or more than the third threshold value, it is determined to be abnormal, the motor 3c of the blower 3 is stopped (step S10), and the output unit 8 is abnormally stopped due to the abnormality of the fan 3a. It is displayed (step S11).

  The history of this abnormal stop is recorded in the storage device 6c connected to the control device 6b shown in FIG. 3 (step S12). The storage device 6c may be composed of an SSD, an HD, an SD card, a CF card, or the like, in addition to the EEPROM. The first to third threshold values are stored in advance in the control device 6b provided on the control board of the outdoor unit 100 or the like.

Display on the output unit 8 in steps S5 and S11 of the flowchart of FIG. 7 will be described with reference to FIGS. 8 and 9.
FIG. 8 is a front view illustrating the configuration of the operation remote controller 81 which is the output unit 8 in the first embodiment. In the example shown in FIG. 8, the display unit 81a of the operation remote controller 81 displays “vibration level 1” and “vibration level 5” for the fan 1 corresponding to the blower 3A and the fan 2 corresponding to the blower 3B shown in FIG. The vibration level is also displayed by the length of the bar so that the vibration level of each fan is clearly understood. Further, in this example, the display unit 81a also displays a name or code (individual number) for identifying the outdoor unit, such as "4 systems No. 1" so that the outdoor unit can be identified. Furthermore, in this example, the outside air temperature is also displayed (-2 °).

  When it is desired to display the vibration level of the fan of another outdoor unit, the operation button 81b can be operated. Further, the display section 81a normally displays the indoor temperature, the set temperature, etc., but when switching to the display of the vibration level of the fan of the outdoor unit, it can be performed by the menu button 81c. .. Further, when the vibration level of the fan of a certain outdoor unit reaches an abnormal level during normal display, the individual number of the abnormal outdoor unit may be displayed on the display unit 81a.

  Further, in the example of FIG. 8, the vibration level is displayed in six levels, but it is preferable that the level can be displayed in at least four levels. The magnitude of vibration may be displayed as a numerical value related to the calculated value of “pulsating current amplitude value × rotational speed” instead of or in addition to the step display.

  In this way, by displaying the vibration level and the magnitude of the vibration with a bar display or numerical values, the user or service person can easily recognize the vibration level of the fan even at the vibration level (abnormal level) that does not cause an abnormal stop. This makes it easier to carry out preventive inspections and has the effect of preventing damage to the outdoor unit.

  FIG. 9 is a front view showing another display example with respect to the display example on the display section 81a of the output section 8 shown in FIG. In FIG. 9, portions denoted by the same reference numerals as those in FIG. 8 are the same or corresponding portions, and different points from FIG. 8 will be described. In the example shown in FIG. 9, only the display method of the display unit 81a is different.

  That is, the display of the vibration level on the display unit 81a shown in FIG. 9 is not a bar display or a numerical display, but an icon in which a fan defect is abstracted and an icon in which a normal fan is abstracted are displayed. Is.

  The fan 1 corresponding to the blower 3A shown in FIG. 1 is displayed with an icon that abstracts the loss of the fan and indicates that it is abnormal. Note that the size of the vibration level is also displayed stepwise by displaying the size of the defect (white part of the fan) stepwise.

The fan 2 corresponding to the blower 3B is displayed with an icon that is an abstraction of a normal fan, and indicates that the vibration level is low and normal.
As described above, even if the vibration level is displayed by the icon that abstracts the fan, the user and the service person can easily recognize the vibration level of the fan, so that it is possible to prevent the outdoor unit from being damaged. ..

  As described above with reference to FIG. 8 and FIG. 9, in the present embodiment, the display unit 81a of the output unit 8 visually determines which of the multi-stage vibration levels the vibration magnitude corresponds to. It is configured such that it can be visually recognized which vibration level among the multi-step vibration levels corresponds to the magnitude of the vibration level obtained by the calculation unit 64. Since it is displayed on the display unit 81a, it is possible to easily grasp and recognize the vibration level of the fan, and it is possible to effectively prevent damage to the outdoor unit.

  The display unit 81a displays the vibration level (abnormal level) in the form of a bar, the display of numerical values or characters, the display of icons such as fans abstracted, the graph bar, the figure, the symbol, etc. May be displayed so that it can be visually recognized.

Next, a partial modification of the above-described first embodiment will be described. In the above-described first embodiment, the calculation unit 64 calculates the product of the pulsating current amplitude value and the fan rotation speed (pulsating current amplitude value × rotation speed), and from the calculated value, the vibration level of the fan. Is determined. On the other hand, in the present modification, the calculation unit 64 calculates the product of the pulsating current amplitude value and the value obtained by squaring the rotation speed of the fan (fan driving current pulsation value × (fan rotation speed) ² ). At the same time, the vibration level of the fan is determined from the calculated value.

In this way, the product of the pulsating current amplitude value and the value obtained by squaring the rotation speed of the fan is calculated, and the vibration level of the fan is determined from this calculated value, so that the fan rotation speed is more accurate from the low rotation speed stage. The vibration level of the fan can be determined. That is, since the calculated value of “pulsation current amplitude value × (rotation speed) ² ” is approximated by the fan excitation force with respect to the fan rotation speed shown in FIG. 5, the vibration level determination accuracy is improved and the lower fan There is an effect that the vibration level of the fan can be accurately detected from the stage of the rotation speed.

  According to the embodiment of the present invention described above, the pulsating current of the component synchronized with the rotation of the fan is extracted from the current value detected by the current detection unit 61 provided in the inverter device 6a, and the pulsating current is Since the abnormality of the fan is determined from the rotation speed of the fan, it is possible to detect the abnormality of the fan inexpensively from a state where the rotation speed of the fan is low, with almost no additional parts added to the outdoor unit 100. Is obtained.

  In addition, a display unit that visually displays which of the multi-step vibration levels the vibration level corresponds to is provided, and the multi-step vibration level obtained by the computing unit is displayed. Since the output unit that displays on the display unit is provided so that it can be visually recognized which of the vibration levels is applicable, it is possible to easily recognize a fan abnormality from a mild stage. Therefore, there is an effect that the outdoor unit 100 can be prevented from being damaged.

  Next, a second embodiment of the outdoor unit of the air conditioner of the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a diagram illustrating a configuration for detecting a fan abnormality in the second embodiment of the present invention, and FIG. 11 is a flowchart illustrating a fan abnormality detection in the second embodiment. In FIGS. 10 and 11, the parts denoted by the same reference numerals as those in FIGS. 1 to 9 are the same or corresponding parts, and the description will focus on the points different from the first embodiment, and the description of the same parts will be omitted.

  In the first embodiment described above, the pulsating current of the component synchronized with the rotation of the fan is extracted from the current value detected by the current detection unit 61 included in the inverter device 6a as the vibration detection unit of the fan 3c. , The example of detecting the vibration of the fan has been described. On the other hand, in the second embodiment, a gyro sensor (angular acceleration sensor) is used as the vibration detecting means.

  This will be described below with reference to FIG. In FIG. 10, 9 is a gyro sensor, and this gyro sensor 9 is attached to a motor support member 3d that supports the motor 3c of the fan 3a. It should be noted that the mounting position of the gyro sensor 9 on the motor support member 3d is, as shown in FIG. 10, a corner on the end side of the motor support member 3d away from the position where the motor 3c is mounted. Acceleration can be detected more accurately.

  The angular acceleration information detected by the gyro sensor 9 is input to the angular acceleration filter circuit 65, and the angular acceleration filter circuit 65 uses the rotation speed signal obtained from the phase detection unit 62 of the inverter device 6a to determine the fan rotation speed frequency. Apply a bandpass filter on the component. This eliminates the influence of disturbances other than the fan 3a. The angular acceleration information after being filtered by the angular acceleration filter circuit 65 is sent to the integration circuit 66 and integrated to find the deflection angle of the motor support member 3d. Therefore, the magnitude of the vibration (vibration level) of the fan 3a can be determined based on the integrated value obtained by the integrating circuit 66.

  The integrated value obtained by the integration circuit 66 is passed to the control device 6b, which determines the vibration level of the fan 3a and displays it on the display unit 81a of the output unit 8. Other configurations are the same as those in the first embodiment.

  Next, the flow of fan abnormality detection according to the second embodiment will be described with reference to FIG. 10 using the flowchart shown in FIG. In FIG. 11, steps S1 and S5 to S12 are the same as those described with reference to FIG. 7. Therefore, description of similar parts will be omitted, and steps S20 to S23 different from FIG. 7 will be mainly described.

  In FIG. 11, after the operation start command, the operation of the outdoor unit blower 3 by the inverter device 6a is started (step S1). Next, in step S20, the rotation speed of the motor 3c of the blower 3 is detected by the phase detection unit 62 of the inverter device 6a.

  In the next step S21, the gyro sensor 9 detects the angular acceleration, and the angular acceleration signal is input to the angular acceleration filter circuit 65. Next, in step S22, the angular acceleration filter circuit 65 uses the angular acceleration signal and the rotation speed signal obtained from the phase detection unit 62 to generate a band of a fan rotation speed frequency component in the angular acceleration signal. A pass filter is applied to obtain the filtered angular acceleration information. The obtained angular acceleration signal is input to the integration circuit 66.

  In the next step S23, the integration circuit 66 integrates the filtered angular acceleration to calculate the deflection angle of the motor support member 3d. The vibration level (abnormal level) of the fan 3a is determined from this calculated value. The determined vibration level is displayed on the display unit 81a of the output unit 8 (step S5). The subsequent flow is the same as that described with reference to FIG. 7.

  According to the second embodiment, the angular acceleration detected by the gyro sensor is used, the shake angle is calculated by integrating the angular acceleration, and the vibration level is determined. It is possible to obtain the effect of more accurately detecting the vibration of the fan (low fan speed abnormality).

  A third embodiment of the outdoor unit of the air conditioner of the present invention will be described with reference to FIG. FIG. 12 is a perspective view illustrating a configuration example of the heat exchanger of the outdoor unit according to the third embodiment of the present invention. Further, the third embodiment is implemented in combination with the above-described first or second embodiment.

  As shown in FIG. 1, when one outdoor unit has two blowers 3A and 3B, and when a fan abnormality is detected by the above-described first or second embodiment, the fan that has detected the abnormality is It is preferable to stop only the blower that it has and continue the operation for the remaining blowers.

  FIG. 12 shows the structure of the heat exchanger inside the housing of FIG. 1, and when the heat exchanger 2 is divided into a plurality of left and right heat exchangers 2A and 2B inside the housing, a fan that has detected an abnormality is detected. When the blower having, for example, the blower 2A is stopped, the velocity distributions of the air passing through the heat exchanger 2A and the heat exchanger 2B are different. That is, the amount of air ventilated through the heat exchanger 2A is significantly smaller than that for the heat exchanger 2B.

  Therefore, in this embodiment, expansion valves (not shown) are provided in the respective refrigerant pipes of the left and right heat exchangers 2A and 2B, and the expansion valves can be independently controlled. Then, for example, when it is detected that an abnormality has occurred in the fan of one blower 3A, the blower 3A having this fan is stopped, and the other normal blower 3B continues to operate.

  Further, for the heat exchanger 2B on the side where the normal blower 3B is provided, a larger number of heat exchangers are used than for the heat exchanger 2A on the side where the blower 3A that detects an abnormality and is stopped is provided. The expansion valves are controlled so that the refrigerant flows. That is, the expansion valve opening degree on the heat exchanger 2A side corresponding to the stopped blower 3A is controlled to be smaller than the expansion valve opening degree on the heat exchanger 2B side corresponding to the blower 3B in continuous operation. The expansion valve is controlled by the control device 6b.

  With this configuration, it is possible to minimize the influence on the refrigeration cycle (air conditioner) when a fan abnormality occurs, and it is possible to obtain an effect that the fan can operate efficiently even when the fan abnormality occurs. In FIG. 12, reference numeral 1a is a frame of the casing 1 that supports the heat exchanger 2 (2A, 2B).

  Further, when the refrigeration cycle is configured by the outdoor unit multi-connection structure in which a plurality of the outdoor units 100 are provided, the following control may be performed. That is, when any one of the outdoor units 100 determines that the fan 3a of the blower 3 is abnormal, the control device 6b stops only the outdoor unit having the fan for which the abnormality is determined, and continues the operation of the other outdoor units. As described above, the control device 6b controls.

  In this way, stop only the outdoor unit that detected an abnormality in the fan and continue operation with other normal outdoor units, or if there are multiple normal outdoor units, the operating load is appropriately adjusted with normal outdoor units. By apportioning it, it is possible to prevent the entire refrigeration cycle of one system from malfunctioning, and when the load is not heavy, the decrease in the cooling and heating capacity seen from the indoor unit side can be made smaller, and more reliable air conditioning. The device can be obtained.

It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
Furthermore, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.

1 ... housing, 1a ... frame,
2 (2A, 2B) ... heat exchanger, 3 (3A, 3B) ... blower,
3a ... fan, 3b ... shroud, 3c ... motor, 3d ... motor support member,
3e ... fan guard,
4 ... Compressor, 5 ... Accumulator,
6 ... Control product box, 6a ... Inverter device, 6b ... Control device, 6c ... Storage device,
61 ... Current detecting section, 62 ... Phase detecting section, 63 ... Pulsating current amplitude value detecting section,
64 ... Arithmetic unit, 65 ... Angular acceleration filter circuit, 66 ... Integration circuit,
7 ... Refrigeration cycle,
8 ... Output unit, 81 ... Operation remote controller, 81a ... Display unit,
9 ... Gyro sensor, 100 ... Outdoor unit,
A ... Normal fan, B ... Unbalanced fan,
B1 ... Unbalanced small fan, B2 ... Unbalanced large fan.

Claims (12)

An outdoor unit of an air conditioner including an outdoor unit having a fan,
Vibration detection means for detecting the vibration of the fan,
A calculation unit that determines which one of the predetermined multi-step vibration levels corresponds to the magnitude of the vibration obtained by the vibration detection unit,
A display unit that visually indicates which vibration level of the vibration level corresponds to the vibration level of multiple levels,
The magnitude of the vibration level obtained by the arithmetic unit is provided with an output unit for displaying on the display unit so that it can be visually recognized which vibration level of the multi-stage vibration level corresponds to ,
In addition to controlling the rotation speed of the fan, an inverter device having a current detection unit for detecting the drive current of the fan is provided.
The vibration detection means extracts a pulsating current of a component synchronized with the rotation of the fan from the current value detected by the current detection unit, and a calculated value of the product of the amplitude value of the pulsating current and the rotation speed of the fan. And the magnitude of the vibration of the fan is detected from the difference between the calculated value and the rotation speed of the normal fan .   The outdoor unit for an air conditioner according to claim 1, further comprising a transmission unit that transmits the vibration level data output from the output unit to the outside.   It is an outdoor unit of the air conditioning apparatus of Claim 1, Comprising: The said display part is a bar display of the said vibration level, it displays with a numerical value or a character, the display with an abstracted icon, a graph bar, a figure, An outdoor unit for an air conditioner, which is visually recognizable by any of the symbols. An outdoor unit of an air conditioner including an outdoor unit having a fan,
Vibration detection means for detecting the vibration of the fan,
A calculation unit that determines which one of the predetermined multi-step vibration levels corresponds to the magnitude of the vibration obtained by the vibration detection unit,
A display unit that visually indicates which vibration level of the vibration level corresponds to the vibration level of multiple levels,
The magnitude of the vibration level obtained by the arithmetic unit is provided with an output unit for displaying on the display unit so that it can be visually recognized which vibration level of the multi-stage vibration level corresponds to, A gyro sensor is installed near the fan,
The outdoor unit of an air conditioner, wherein the vibration detection unit detects the magnitude of vibration of the fan based on the output of the gyro sensor. An outdoor unit of an air conditioner including an outdoor unit having a fan,
An inverter device having a current detection unit that controls the rotation speed of the fan and that detects a drive current of the fan;
From a current value detected by the current detection unit provided in the inverter device, a pulsating current extracting unit that extracts a pulsating current of a component synchronized with the rotation of the fan,
The calculated value of the product of the amplitude value of the pulsating current extracted by the pulsating current extraction means and the rotation speed of the fan is obtained, and the abnormality of the fan is determined from the difference between the calculated value and the rotation speed of the normal fan. An arithmetic unit,
An outdoor unit for an air conditioner, comprising an output unit that outputs a determination result of a fan abnormality in this arithmetic unit. It is an outdoor unit of the air conditioning apparatus of Claim 5 , Comprising: The said calculation part calculates | requires the calculated value of the product of the amplitude value of the said pulsating current and the rotation speed of the said fan, The said calculation with respect to the rotation speed of a normal fan. An outdoor unit for an air conditioner, characterized in that the vibration level of the fan is determined from the difference from the value and the determined vibration level is output from the output unit. It is an outdoor unit of the air conditioning apparatus of Claim 6 , Comprising: The said calculation part determines the presence or absence of abnormality of the said fan from the determined vibration level, and outputs the presence or absence of abnormality of the said fan from the said output part. An outdoor unit for an air conditioner. A outdoor unit of an air conditioner according to claim 6, wherein the arithmetic unit includes a calculation value of the amplitude value and the rotational speed of the product of the fan of the pulsating current, the calculated value for the rotational speed of the normal fan An outdoor unit for an air conditioner, which determines that the fan is abnormal and outputs the fan abnormality from the output unit when the difference between the fan and the fan exceeds a predetermined threshold. A outdoor unit of an air conditioner according to claim 6, wherein the arithmetic unit, the product of the amplitude value and the value obtained by squaring the rotational speed of the fan of the pulsating current and the calculated value, said from this calculation detection value An outdoor unit for an air conditioner, wherein the vibration level of a fan is determined. The outdoor unit of the air-conditioning apparatus according to claim 8 , further comprising a storage unit that stores a result of determining the abnormality of the fan, wherein the output unit is configured to output past abnormality determination history of the fan. The outdoor unit of the air conditioner, which is characterized in that The outdoor unit of the air conditioning apparatus according to claim 7 , wherein the outdoor unit includes a plurality of heat exchangers, a plurality of blowers for ventilating the respective heat exchangers, and a plurality of the heat exchangers. A plurality of expansion valves respectively provided for the exchanger, and a control device for controlling the blower and the expansion valve are provided, and the control device is configured so that the fan of at least one blower of the plurality of blowers has an abnormality. If it is determined that the blower having the fan that has been determined to be abnormal is stopped, the normal blower continues to operate, and the expansion valve opening degree on the heat exchanger side corresponding to the stopped blower is continuously operated. The outdoor unit of the air conditioner, which is controlled to be smaller than the expansion valve opening degree on the heat exchanger side corresponding to the blower. The outdoor unit of the air conditioner according to claim 7 , wherein the outdoor unit has an outdoor unit multi-connection structure in which a plurality of units are provided, and when an abnormality of a fan of any of the outdoor units is determined, an abnormality determination is made. An outdoor unit for an air conditioner, comprising a control device that stops only the outdoor unit having a fan and controls the other outdoor units to continue operation.

Images