JP4876095B2 - air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and is particularly suitable for an air conditioner including an indoor unit that cools a server room.

  As a conventional server, a processing unit and a server fan are built-in so that air in the room is sucked from the suction port on the back of the server, blown through the processing unit that is a heat generating device, cooled, and then blown out from the blowout on the front of the server. There is what I did. A plurality of servers are arranged side by side in a server room and arranged in a plurality of rows. The servers are arranged in the same direction in each column, and are arranged in a plurality of columns so that the directions are alternately reversed.

  An air conditioner that cools the server room includes a refrigeration cycle including a compressor, a condenser, a decompression device, and an evaporator, and a control device. The air conditioner includes an indoor unit installed in the server room and an outdoor unit installed outside the server room.

  The indoor unit includes an evaporator, an indoor unit fan that sucks room air from the back of the indoor unit and cools it through the evaporator, and blows out the air from the front of the indoor unit, and a temperature sensor that detects the temperature of the intake air or the blown air. . This indoor unit is composed of a plurality of indoor units arranged in each row of servers in the direction opposite to the direction of the servers in the row.

  Further, the control device performs control so that the indoor unit fan is continuously operated when the operation of the compressor is stopped. That is, the air in the server room is circulated even when the operation of the compressor is stopped to promote ventilation to the server, the ambient temperature of the temperature sensor that detects the temperature of the intake air or the blown air, and the temperature in the air-conditioning target space. For the purpose of ensuring the same detection accuracy as much as possible, the indoor unit fan is always operated, and the remote controller switch is controlled so as to continue the operation with the set air volume during the operation of the compressor. A state in which the indoor unit fan is operated when the compressor is stopped is referred to as thermo-off, and a state in which the indoor unit fan is operated during the compressor operation is referred to as thermo-on. Further, when the thermostat is turned off, in order to protect the compressor, control is generally performed so that the compressor is not restarted for a predetermined time (for example, 3 minutes).

  In the operating state of the server and the air conditioner, the room air was sucked in from the back of the server, the exhaust heat of the processing unit was cooled and the temperature was raised and blown out from the front, and then installed in the server row It is sucked in from the back of the indoor unit, cooled by the evaporator, and blown out from the front. The cooling air blown out from the indoor unit reaches the back side of the server, is sucked into the server, cools the server, and then blows out from the front of the server. Air in the server room is circulated in this way to cool the server well.

JP 2003-166729 A

  In such an air conditioner, when the thermostat is off, the air blowing operation is continued with the same air volume as in the cooling operation, and the operation of the compressor is stopped so that the refrigeration cycle is not operated. When the temperature of the processing unit adjacent to the indoor unit rises and the temperature of the blown air from the server rises, for example, when the thermo-off is performed, the air blowing operation is continued with the cooling air flow, so the hot air blown from the server Most of them will be sucked into indoor units. Since the hot air sucked into the indoor unit is not cooled by the evaporator, it is blown out from the back side at the same hot air temperature. As a result, hot air is supplied to the back side of the server whose temperature is rising and is sucked into the server, which may cause adverse effects such as shortening the life of the server processing unit and malfunctioning.

  As a patent document related to such an air conditioner, there is JP-A-2003-166729 (Patent Document 1).

  An object of the present invention is to obtain an air conditioner capable of extending the service life of a server processing unit and preventing malfunction.

In the first aspect of the present invention for achieving the above-mentioned object, the server room includes a processing unit and a server fan, and a plurality of servers arranged side by side to suck in the air in the server room and blow out the air after passing through the processing unit. In an air conditioner having a refrigeration cycle comprising a compressor, a condenser, a decompression device, an evaporator, and a control device, the air in the evaporator and the server room is sucked and ventilated in the evaporator and the indoor fan, the indoor unit with a built-in place on the server room to be blown from the further the indoor unit has a built-in temperature sensor that detects a temperature of intake air or air blowing from the indoor unit, before Symbol it and the detected temperature of and the temperature sensor in the case where the operation upon stopping of the compressor is performed by continuing the operation of the indoor unit fan is set temperature or higher When the said control device is to control so as to lower the rotation speed of the indoor fan.

A more preferable specific configuration example in the first aspect of the present invention is as follows.
(1) the control device, during the operation stop of the compressor, and controls so as not to restart only set time the compressor, the temperature detected by the said temperature sensor within the set time the set temperature or more In such a case, control is performed so that the number of rotations of the indoor unit fan is lowered.
(2) In said (1), the said control apparatus controls so that the rotation speed of the said indoor unit fan may be made low gradually with the raise of the temperature which the said temperature sensor detects.
(3) In (1), when the operation of the compressor is stopped, the control device rotates the indoor unit fan based on a temperature difference between a temperature detected by the temperature sensor and a temperature set by a remote controller. To control the number.
(4) In (1), when the operation of the compressor is stopped, the control device determines whether the indoor unit fan is based on a temperature difference between a temperature detected by the temperature sensor and a preset threshold value. Control the number of revolutions.
(5) In the above (1), the indoor unit has a plurality of indoor unit fans and a plurality of temperature sensors for detecting the temperature of the intake air or the blown air corresponding to the indoor unit fans. The control device controls the rotation speed of the corresponding indoor unit fan based on the temperature detected by each temperature sensor when the compressor is stopped.

Further, in the second aspect of the present invention, a plurality of servers having a processing unit and a server fan are built in, and the server room sucks air from the suction port on the back of the server and blows it out from the blower outlet on the front of the server through the processing unit. used to the server room in which a cooling compressor, a condenser, a pressure reducing device, the refrigerating cycle of an evaporator, in the air conditioner having a control device, and the evaporator, the server room air An indoor unit having a built-in indoor unit fan that sucks in from a suction port on the rear side of the indoor unit and blows out from a blowout port on the front side of the indoor unit is disposed in a reverse direction between the plurality of servers, and the indoor unit is a built-in temperature sensor for detecting the temperature of suction air or blown air, the control device, during the operation stop of the compressor, during a predetermined the compressor Only with controlled not restart, the indoor unit when the detected temperature of the indoor fan the temperature sensor and within the predetermined time if performed by continuing the operation of is not less than the set temperature The purpose is to control the fan speed to be low.

A more preferable specific configuration example in the second aspect of the present invention is as follows.
(1) The indoor unit is used in a server room in which the arrangement of the servers is alternately arranged in a plurality of columns, and is arranged in each column of the servers in a direction opposite to the direction of the servers in the column. thing.

  According to the air conditioner of the present invention, it is possible to extend the service life of the server processing unit and prevent malfunction.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent.

(First embodiment)
The air conditioner of 1st Embodiment of this invention is demonstrated using FIGS. 1-6.

  First, the overall configuration and functions of the air conditioner of the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a state in which an indoor unit of an air conditioner according to this embodiment is installed in a server room, and FIG. 2 is a conceptual diagram of the indoor unit in FIG.

  The server 2 incorporates a processing unit and a server fan, sucks the air in the server room from the suction port 2a on the back of the server as shown by the arrow 6 in FIG. After that, as shown by an arrow 3 in FIG. 1, the air is blown into the server room from the air outlet 2b on the front surface of the server. A plurality of servers 2 are arranged in a server room and arranged in a plurality of rows. Specifically, the arrays of servers 2 are arranged in the same direction in each column, and are arranged in a plurality of columns so that the directions are alternately reversed. The arrangement of the server 2 prevents the air blown from the server 2 from being directly sucked into the server 2 facing the server 2. In the server room, other communication / information processing devices may be arranged together with the server.

  An air conditioner that cools the server room includes a refrigeration cycle including a compressor, a condenser that is an outdoor heat exchanger, a decompression device, and an evaporator 8 that is an indoor heat exchanger, and the refrigeration cycle and the fan motor 11. And a control device for controlling. The air conditioner of this embodiment is dedicated to cooling the server room, but may be heated or dehumidified as necessary. The air conditioner includes an indoor unit 1 installed in the server room and an outdoor unit installed outside the server room.

  As shown in FIG. 2, the indoor unit 1 includes an evaporator 8, an indoor unit fan 9, a fan motor 11, a suction temperature sensor 12, an outlet temperature sensor 13, and a remote control switch 14.

  The indoor unit fan 9 is driven by a fan motor 11 and sucks the air in the server room from the suction port 1a on the rear surface of the indoor unit as shown by an arrow 4 in FIGS. As shown by the arrow 5, it functions to blow out from the blower outlet 1b on the front surface of the indoor unit. The fan motor 11 is composed of an inverter drive motor and is controlled by a control device.

  The suction temperature sensor 12 detects the indoor unit suction temperature, which is the suction air temperature, and is disposed at a location where it is desired to detect the suction air temperature inside the suction port 1a or outside the indoor unit. The blowout temperature sensor 13 detects the indoor unit blowout temperature, which is the blowout air temperature, and is disposed at a location where it is desired to detect the blowout air temperature inside the blowout port 1b or outside the indoor unit. Note that only the suction temperature sensor 12 or the blowout temperature sensor 13 may be provided.

  The remote control switch 14 is a device for setting the operation and stop of the air conditioner, the air volume of the indoor unit (the number of rotations of the indoor unit fan; the operating frequency), the indoor unit blowing temperature, etc.

  The indoor unit 1 is configured by an indoor unit arranged in each row of the servers 2 in the direction opposite to the direction of the servers 2 in the row. Thereby, the air blown out from the server 2 can be efficiently sucked and blown out efficiently to the evaporator and the suction side of the server 2. Further, the indoor units 1 are installed with their arrangement positions shifted so as not to face each other directly. Thereby, the air blown out from the indoor unit 1 can be blown out to the suction side of the server 2 without directly buffering.

  During the normal cooling operation, the control device uses the set temperature (or threshold value) set by the remote control switch 14 and the temperature detected by the temperature detection sensors 12 and 13 of the indoor unit 1 and the indoor unit suction temperature. Alternatively, the air conditioner is controlled so that the indoor unit blowing temperature approaches the temperature (or threshold value) set by the remote control switch 14. Specifically, the blower temperature control for controlling the air conditioner so that the blown air temperature of the indoor unit 1 becomes the temperature (or threshold value) set by the remote control switch 14 or the like, and the intake air temperature of the indoor unit is the remote control. The suction temperature control for controlling the compressor of the air conditioner so that the temperature (or threshold value) set by the switch 14 or the like can be selected depending on the use environment.

  In this air conditioning operation, when the indoor unit suction temperature or the indoor unit blowing temperature of the air conditioner becomes a set temperature set by the remote control switch 14 or a preset threshold value, the control device stops the compressor of the air conditioner. Then, control is performed so that only the indoor unit fan 9 is continued. This state is referred to as thermo-off as described above. The air volume of the indoor unit fan 9 at the time of shifting to the thermo-off is a set air volume when the compressor is operating.

  When the thermostat is turned off, the compressor is controlled so as not to restart for a predetermined time (for example, 3 minutes) in order to protect the compressor. In the thermo-off mode, usually, when the blow-out temperature or the suction temperature of the indoor unit 1 becomes higher than the temperature set by the remote control switch 14 (or until the temperature becomes higher than the temperature set by the remote control switch 14), The air volume of the indoor unit fan 9 is continued.

However, when the temperature of the processing unit of the server 2 rises and the temperature of the blown air rises during the control for protecting the compressor when the thermo is off, the operation of the compressor cannot be started. Therefore, in the present embodiment, when the operation of the compressor is stopped, if the temperature detected by the temperature sensor exceeds the above-described predetermined temperature, control is performed so that the rotational speed of the indoor unit fan 9 is lowered. As a result, the amount of hot air blown out from the server 2 whose temperature has risen is sucked into the indoor unit 1, and the air blown out from the back side along with this, suppresses the rise in air temperature and reduces the air volume. Thereby, since the rise in the intake air temperature of the server 2 whose temperature has risen can be suppressed, it is possible to extend the life of the processing unit of the server 2 and prevent malfunction .

  In FIG. 3, when the operation of the compressor is stopped and the thermostat is turned off (step S41), the air volume (operating frequency; rotation speed) of the indoor unit fan 9 continues the set air volume while the thermostat is on (step S42). The indoor unit fan 9 is rotated by the inverter drive fan motor 11, and the set air volume during the thermo-on is the fan motor operating frequency aHz.

  In this state, it is determined whether the indoor unit outlet temperature To (temperature detected by the outlet temperature sensor 13) is + A ° C. with respect to the outlet set temperature Ts1 set by the remote control switch 14 (step S43). In this determination, if Ts1 + A ° C. is not satisfied, the process returns to step S42 and the determination in step S45 is repeated.

  If it is determined in step S43 that Ts1 + A ° C., the operating frequency of the fan motor 11 is lowered to bHz to reduce the air volume (step S44). As a result, the amount of hot air blown out from the server 2 whose temperature has risen can be reduced.

  In this state, it is determined whether the indoor unit blowout temperature To is + B ° C. with respect to the blowout set temperature Ts1. If Ts1 + B ° C. is not satisfied in this determination, the process returns to step S44 and the determination in step S44 is repeated.

  If it is determined in step S45 that Ts1 + B ° C., the operating frequency of the fan motor 11 is further lowered to cHz to reduce the air volume (step S46). As a result, the amount of hot air blown from the server 2 whose temperature has further increased is sucked into the indoor unit 1 can be further reduced.

  In this state, it is determined whether the indoor unit outlet temperature To has reached + C ° C. with respect to the outlet preset temperature Ts1 (step S47). If Ts1 + C ° C. is not satisfied in this determination, the process returns to step S46, and the determination in step S47 is repeated.

  If it is determined in step S47 that Ts1 + C ° C., the operating frequency of the fan motor 11 is further lowered to dHz to reduce the air volume (step S48). As a result, the amount of hot air blown from the server 2 whose temperature has further increased is sucked into the indoor unit 1 can be further reduced.

  Note that A, B, and C in FIG. 3 are preset threshold values and are set to satisfy A <B <C, and each set operating frequency a, b, c, and d is a> b> c> d It is set to become.

  According to the control of FIG. 3, since the control is performed so that the rotation speed of the indoor unit fan 9 is gradually lowered as the temperature detected by the blowout temperature sensor 13 increases, the server 2 is more reliably protected. be able to.

  In FIG. 4, when the operation of the compressor is stopped and the thermostat is turned off (step S51), the air volume (operating frequency; rotation speed) of the indoor unit fan 9 continues the set air volume while the thermostat is on (step S52). The indoor unit fan 9 is rotated by the inverter drive fan motor 11, and the set air volume during the thermo-on is the fan motor operating frequency aHz.

  In this state, it is determined whether the indoor unit suction temperature Ti (temperature detected by the suction temperature sensor 12) is + A ° C. with respect to the suction set temperature Ts2 set by the remote control switch 14 (step S53). If Ts2 + A ° C. is not satisfied in this determination, the process returns to step S52 and the determination in step S53 is repeated.

  If it is determined in step S53 that Ts2 + A ° C., the operating frequency of the fan motor 11 is lowered to bHz to reduce the air volume (step S54). As a result, the amount of hot air blown out from the server 2 whose temperature has risen can be reduced.

  In this state, it is determined whether the indoor unit suction temperature Ti is + B ° C. with respect to the suction set temperature Ts2 (step S55). If Ts2 + B ° C. is not satisfied in this determination, the process returns to step S54 and the determination in step S55 is repeated.

  If it is determined in step S55 that Ts2 + B ° C., the operating frequency of the fan motor 11 is further lowered to cHz to reduce the air volume (step S55). As a result, the amount of hot air blown from the server 2 whose temperature has further increased is sucked into the indoor unit 1 can be further reduced.

  In this state, it is determined whether the indoor unit suction temperature Ti is + C ° C. with respect to the suction set temperature Ts2 (step S56). If Ts2 + C ° C. is not satisfied in this determination, the process returns to step S55, and the determination in step S56 is repeated.

  If it is determined in step S56 that Ts2 + C ° C., the operating frequency of the fan motor 11 is further lowered to dHz to reduce the air volume (step S57). As a result, the amount of hot air blown from the server 2 whose temperature has further increased is sucked into the indoor unit 1 can be further reduced.

  In FIG. 4, A, B, C, and a, b, c, and d are the same threshold values as in FIG.

  According to the control of FIG. 4, the control is performed so that the rotation speed of the indoor unit fan 9 is gradually lowered as the temperature detected by the suction temperature sensor 12 rises, so that the server 2 is more reliably protected. be able to.

  In FIG. 5, when the operation of the compressor is stopped and the thermostat is turned off (step S61), the air volume (operating frequency; rotational speed) of the indoor unit fan 9 continues the set air volume while the thermostat is on (step S62). The indoor unit fan 9 is rotated by the inverter drive fan motor 11, and the set air volume during the thermo-on is the fan motor operating frequency aHz.

  In this state, it is determined whether the indoor unit suction temperature Ti or the indoor unit outlet temperature To has reached the threshold value X ° C. (step S63). In addition, although expressed as the indoor unit suction temperature Ti or the indoor unit blowing temperature To, two operation flows controlled by one of the temperatures are simplified. If it is determined that the temperature is not X ° C., the process returns to step S62, and the determination in step S63 is repeated.

  If it is determined in step S63 that the temperature is X ° C, the operating frequency of the fan motor 11 is lowered to bHz to reduce the air volume (step S64). As a result, the amount of hot air blown out from the server 2 whose temperature has risen can be reduced.

  In this state, it is determined whether the indoor unit suction temperature Ti or the indoor unit blowing temperature To has reached the threshold value Y ° C. (step S65). In this determination, if it is not Y ° C., the process returns to step S64 and the determination in step S65 is repeated.

  If it is determined in step S65 that the temperature is Y ° C., the operating frequency of the fan motor 11 is further lowered to cHz to reduce the air volume (step S66). As a result, the amount of hot air blown from the server 2 whose temperature has further increased is sucked into the indoor unit 1 can be further reduced.

  In this state, it is determined whether the indoor unit suction temperature Ti or the indoor unit blowing temperature To has reached the threshold value Z ° C. (step S67). If it is determined that the temperature is not Z ° C., the process returns to step S66, and the determination in step S67 is repeated.

  If it is determined in step S67 that the temperature is Z ° C., the operating frequency of the fan motor 11 is further lowered to dHz to reduce the air volume (step S68). As a result, the amount of hot air blown from the server 2 whose temperature has further increased is sucked into the indoor unit 1 can be further reduced.

  Note that X, Y, and Z in FIG. 5 are preset threshold values and are set to satisfy X <Y <Z.

  According to the control of FIG. 5, since the control is performed so that the rotational speed of the indoor unit fan 9 is gradually decreased as the temperature detected by the suction temperature sensor 12 or the blowout temperature sensor 13 increases, It can protect more reliably.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a conceptual diagram of an indoor unit of an air conditioner according to the second embodiment of the present invention, FIG. 7 is a flowchart for controlling the indoor unit fan with the blowing temperature during the thermo-off of the air conditioner of the second embodiment, and FIG. FIG. 9 is a flowchart for controlling the indoor unit fan with a plurality of threshold values during the thermo-off of the air conditioner according to the second embodiment. The control in FIGS. 7 to 9 can be switched by selecting with the changeover switch or the remote control switch 14 in the indoor unit 1.

  The second embodiment is different from the first embodiment in the following points, and the other points are basically the same as those in the first embodiment. .

  In the second embodiment, as shown in FIG. 6, the indoor unit 1 drives a plurality of indoor unit fans 9 including a first indoor unit fan 9a and a second indoor unit fan 9b, and the first indoor unit fan 9a. A plurality of indoor unit fan motors 11 each including a first indoor unit fan motor 11a and a second indoor unit fan motor 11b for driving the second indoor unit fan 9b, and the first indoor unit fan 9a are provided in a ventilation path. The 1st suction temperature sensor 12a and the 1st blowing temperature sensor 13a, The 2nd suction temperature sensor 12b provided in the ventilation path by the 2nd indoor unit fan 9b, and the 2nd blowing temperature sensor 13b are provided.

  In FIG. 7, when the operation of the compressor is stopped and the thermo is turned off (step S71), the air volume (operating frequency; rotation speed) of the first indoor unit fan 9a continues the set air volume during the thermo on (step S721). The air volume (operating frequency; rotation speed) of the second indoor unit fan 9b continues the set air volume during the thermo-ON (step S722).

  The control in steps S721 to S781 is different from the control in steps S42 to S48 described above only in whether the control target is the first indoor unit fan 9a or the indoor unit fan 9a, and the others are the same. Because of this control, redundant description is omitted.

  Further, the control in steps S722 to S772 is different from the control in steps S42 to S48 described above only in whether the control target is the second indoor unit fan 9b or the indoor unit fan 9a, and the other control is the same. Therefore, a duplicate description is omitted.

  In the state where the operating frequency of the first indoor unit fan 9a or the second indoor unit fan 9b is dHz (step S781 or S782 state), whether a temperature difference has occurred between the indoor unit outlet temperature To1 and the indoor unit outlet temperature To2. Determination is made (step S79).

  If the indoor unit outlet temperature To1 is higher than the indoor unit outlet temperature To2 in this determination, the operation of the first indoor unit fan 9a is stopped (step S791). If it is determined in step S79 that the indoor unit outlet temperature To2 is higher than the indoor unit outlet temperature To1, the operation of the second indoor unit fan 9b is stopped (step S792). In other words, the indoor unit fan 9a or 9b on the high temperature side is stopped.

  According to the control in FIG. 7, as the temperature detected by the blowout temperature sensor 13 increases, the rotational speeds of the plurality of indoor unit fans 9 a and 9 b are controlled to be gradually lowered, and finally Since the control is performed so that only the indoor unit fan 9a or 9b is stopped, the server 2 can be more reliably protected.

  In FIG. 8, when the operation of the compressor is stopped and the thermo is turned off (step S81), the air volume (operating frequency; rotation speed) of the first indoor unit fan 9a continues the set air volume during the thermo on (step S821). The air volume (operating frequency; rotation speed) of the second indoor unit fan 9b continues the set air volume during the thermo-ON (step S822).

  The control in steps S821 to S881 differs from the control in steps S42 to S48 described above only in whether the control target is the first indoor unit fan 9a or the indoor unit fan 9a, and the other is the same. Because of this control, redundant description is omitted.

  Further, the control in steps S822 to S872 is different from the control in steps S42 to S48 described above only in whether the control target is the second indoor unit fan 9b or the indoor unit fan 9a, and the other control is the same. Therefore, a duplicate description is omitted.

  Whether or not a temperature difference has occurred between the indoor unit suction temperature Ti1 and the indoor unit suction temperature Ti2 when the operating frequency of the first indoor unit fan 9a or the second indoor unit fan 9b is dHz (the state of step S881 or S882). Determination is made (step S89).

  If it is determined that the indoor unit suction temperature Ti1 is higher than the indoor unit suction temperature Ti2, the operation of the first indoor unit fan 9a is stopped (step S891). If it is determined in step S89 that the indoor unit suction temperature Ti2 is higher than the indoor unit suction temperature Ti1, the operation of the second indoor unit fan 9b is stopped (step S892). In other words, the indoor unit fan 9a or 9b on the high temperature side is stopped.

  According to the control of FIG. 8, as the temperature detected by the suction temperature sensor 12 increases, the rotational speeds of the plurality of indoor unit fans 9 a and 9 b are controlled to be gradually lowered, and finally Since the control is performed so that only the indoor unit fan 9a or 9b is stopped, the server 2 can be more reliably protected.

  In FIG. 9, when the operation of the compressor is stopped and the thermo is turned off (step S91), the air volume (operating frequency; rotation speed) of the first indoor unit fan 9a continues the set air volume during the thermo on (step S921). The air volume (operating frequency; rotation speed) of the second indoor unit fan 9b continues the set air volume during the thermo-ON (step S922).

  The control in steps S921 to S981 differs from the control in steps S42 to S48 described above only in whether the control target is the first indoor unit fan 9a or the indoor unit fan 9a, and the other is the same. Because of this control, redundant description is omitted.

  Further, the control in steps S922 to S972 differs from the control in steps S42 to S48 described above only in whether the control target is the second indoor unit fan 9b or the indoor unit fan 9a, and the other control is the same. Therefore, a duplicate description is omitted.

  When the operating frequency of the first indoor unit fan 9a or the second indoor unit fan 9b is dHz (the state of step S981 or S982), the indoor unit suction temperature Ti1 or the indoor unit blowing temperature To1 and the indoor unit suction temperature Ti2 or the air conditioner It is determined whether or not a temperature difference has occurred between the indoor unit outlet temperature To2 (step S99).

  If it is determined that the indoor unit suction temperature Ti1 or the indoor unit blowing temperature To1 is higher than the indoor unit suction temperature Ti2 or the indoor unit blowing temperature To2, the operation of the first indoor unit fan 9a is stopped (step S991). If the indoor unit suction temperature Ti2 or the indoor unit blowing temperature To2 is higher than the indoor unit suction temperature Ti1 or the indoor unit blowing temperature To1 as determined in step S99, the operation of the second indoor unit fan 9b is stopped ( Step S991). In other words, the indoor unit fan 9a or 9b on the high temperature side is stopped.

  According to the control of FIG. 9, the control is performed so that the rotational speeds of the plurality of indoor unit fans 9a and 9b are gradually lowered as the temperature detected by the suction temperature sensor 12 or the blowout temperature sensor 13 increases. Eventually, only the one indoor unit fan 9a or 9b is controlled to stop, so that the server 2 can be protected more reliably.

It is a perspective view which shows the state which installed the indoor unit of the air conditioner of 1st Embodiment of this invention in the server room. It is a conceptual diagram of the indoor unit 1 of FIG. It is a flowchart which controls an indoor unit fan by blowing temperature during the thermo-off of the air conditioner of 1st Embodiment. It is a flowchart which controls an indoor unit fan with suction temperature during the thermo-off of the air conditioner of 1st Embodiment. It is a flowchart which controls an indoor unit fan with a some threshold value during the thermo-off of the air conditioner of 1st Embodiment. It is a conceptual diagram of the indoor unit of the air conditioner of 2nd Embodiment of this invention. It is a flowchart which controls an indoor unit fan by blowing temperature during the thermo-off of the air conditioner of 2nd Embodiment. It is a flowchart which controls an indoor unit fan with suction | inhalation temperature during the thermo-off of the air conditioner of 2nd Embodiment. It is a flowchart which controls an indoor unit fan with a some threshold value during the thermo-off of the air conditioner of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Indoor unit of air conditioner, 1a ... Indoor unit inlet, 1b ... Indoor unit outlet, 2 ... Server, 2a ... Server machine inlet, 2b ... Server outlet, 3 ... Server outlet, 4 ... Indoor unit inlet Air, 5 ... Indoor unit blown air, 6 ... Server intake air, 8 ... Evaporator, 9 ... Indoor unit fan, 9a ... First indoor unit fan, 9b ... Second indoor unit fan, 11 ... Indoor unit fan motor, 11a ... 1st indoor unit fan motor, 11b ... 2nd indoor unit fan motor, 12 ... Suction temperature sensor, 12a ... 1st suction temperature sensor, 12b ... 2nd suction temperature sensor, 13 ... Blowing temperature sensor, 13a ... 1st blowing Temperature sensor, 13b ... second blowout temperature sensor, 14 ... remote control switch, Ts1 ... indoor unit blowout set temperature, Ts2 ... indoor unit suction set temperature, Ti1, Ti2 ... indoor unit suction temperature, To1, To2 ... indoor unit blowout Every time, a ... thermo setting frequency, b, c, d ... operation setting frequency, A, B, C ... temperature control threshold, X, Y, Z ... temperature control threshold.

Claims (8)

Processing unit and a built-in server fan is used for cooling the server rooms which are arranged side by side a plurality of servers blown from the ventilation to the processing unit draws server room air,
In an air conditioner equipped with a refrigeration cycle comprising a compressor, a condenser, a decompression device, an evaporator, and a control device,
An indoor unit that includes the evaporator and an indoor unit fan that sucks in the air in the server room and blows it out through the evaporator is disposed in the server room,
Furthermore, the said indoor unit incorporates the temperature sensor which detects the temperature of the inhalation air or blowing air of the said indoor unit,
When the detected temperature of and the temperature sensor in the case where performed to continue operation of the indoor unit fan when the operation stop of the previous SL compressor is equal to or higher than the set temperature, the controller, the indoor unit fan The air conditioner is characterized in that it is controlled so as to reduce the rotation speed. According to claim 1, wherein the control device, the operation when the compressor is stopped, controls so as not to restart only set time the compressor, the temperature is the set temperature for detecting said temperature sensor within the preset time An air conditioner that is controlled so as to reduce the number of rotations of the indoor unit fan when the above is reached .   3. The air conditioner according to claim 2, wherein the control device controls the rotational speed of the indoor unit fan to be gradually lowered as the temperature detected by the temperature sensor increases.   3. The control device according to claim 2, wherein the control device controls the rotation speed of the indoor unit fan based on a temperature difference between a temperature detected by the temperature sensor and a temperature set by a remote controller when the compressor is stopped. An air conditioner characterized by that.   3. The control device according to claim 2, wherein the control device controls the rotational speed of the indoor unit fan based on a temperature difference between a temperature detected by the temperature sensor and a preset threshold value when the compressor is stopped. An air conditioner characterized by   3. The control device according to claim 2, wherein the indoor unit includes a plurality of the indoor unit fans and a plurality of temperature sensors that detect temperatures of the intake air or the blown air corresponding to the indoor unit fans. Is an air conditioner that controls the number of rotations of the corresponding indoor unit fan based on the temperature detected by each of the temperature sensors when the compressor is stopped. Built-in processing unit and server fan, used to cool the server room, in which a plurality of servers are arranged in the same direction to suck in the air in the server room from the suction port on the back of the server and blow out from the air outlet on the front of the server through the processing unit. ,
In an air conditioner equipped with a refrigeration cycle comprising a compressor, a condenser, a decompression device, an evaporator, and a control device,
And the evaporator, disposed and an indoor unit fan for blowing from the suction indoor unit front of the air outlet to the server room air from the indoor unit back of the suction port, a built-in indoor unit in the opposite direction between the plurality of servers ,
Furthermore, the said indoor unit incorporates the temperature sensor which detects the temperature of the inhalation air or blowing air of the said indoor unit,
The control device controls the compressor not to be restarted for a predetermined time when the operation of the compressor is stopped, and continues to operate the indoor unit fan and within the predetermined time. An air conditioner characterized in that when the temperature detected by the temperature sensor becomes equal to or higher than a set temperature, the rotational speed of the indoor unit fan is controlled to be low.   8. The indoor unit according to claim 7, wherein the indoor unit is used in a server room in which the arrangement of the servers is alternately arranged in a plurality of reverse rows, and is arranged in each row of the servers in a direction opposite to the direction of the servers in the row. Air conditioner characterized by being.

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