WO2015151280A1 - Unité d'intérieur pour dispositif de conditionnement d'air - Google Patents

Unité d'intérieur pour dispositif de conditionnement d'air Download PDF

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Publication number
WO2015151280A1
WO2015151280A1 PCT/JP2014/059984 JP2014059984W WO2015151280A1 WO 2015151280 A1 WO2015151280 A1 WO 2015151280A1 JP 2014059984 W JP2014059984 W JP 2014059984W WO 2015151280 A1 WO2015151280 A1 WO 2015151280A1
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WO
WIPO (PCT)
Prior art keywords
blower
vane
indoor unit
protection device
detecting
Prior art date
Application number
PCT/JP2014/059984
Other languages
English (en)
Japanese (ja)
Inventor
悠介 桑原
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2014/059984 priority Critical patent/WO2015151280A1/fr
Publication of WO2015151280A1 publication Critical patent/WO2015151280A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/00077—Indoor units, e.g. fan coil units receiving heat exchange fluid entering and leaving the unit as a liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/32—Details or features not otherwise provided for preventing human errors during the installation, use or maintenance, e.g. goofy proof

Definitions

  • the present invention relates to an indoor unit of an air conditioner having a protection function.
  • a conventional inverter-controlled air conditioner has a compressor placed in the casing of an outdoor unit, and controls the operating frequency of the compressor when the operating current of the compressor reaches the operating current of the compressor protection device.
  • the operating current of the compressor reaches the release current of the compressor protection device due to the decrease of the operating frequency
  • the operating frequency of the compressor is increased by the predetermined value by the control device. It was common (see, for example, Patent Document 1). For this reason, in the compressor, the operation was not stopped even when the current reached the operating current of the protective device.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an indoor unit of an air conditioner that can continue driving without stopping the blower during maintenance.
  • An indoor unit of an air conditioner has a suction port and a blower outlet, a housing provided with a service panel that is removed during maintenance, a heat exchanger placed in the housing, and a housing.
  • a blower that sucks air from the suction port and discharges the air from the outlet through the heat exchanger, a control device that controls the blower, and a protection device that stops the blower and protects the blower, The control device continues the driving of the blower so that the protection device does not operate during maintenance.
  • the present invention can continue driving without stopping the blower by keeping the drive current of the blower from exceeding the operating current of the protection device at the time of maintenance.
  • FIG. 1 is a front view schematically showing a configuration of an indoor unit (hereinafter simply referred to as an indoor unit) 1 of an air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the indoor unit 1 which concerns on this Embodiment is provided with the housing
  • a heat exchanger 2 is disposed in the housing 1a.
  • the housing 1a is provided with a suction port 3 in the upper part and a blower outlet 4 in the lower part.
  • a blower 5 is provided in the vicinity of the air outlet 4.
  • electronic components such as the microcomputer 6 are mounted in the housing 1a.
  • a service panel 7 is attached to the wall surface of the housing 1a.
  • a sensor 8 is attached in the vicinity of the service panel 7.
  • the heat exchanger 2 is connected to a compressor, a heat exchanger, an expansion valve, and a refrigerant pipe mounted in an outdoor unit (not shown) to constitute a refrigeration cycle.
  • the blower 5 sucks air from the suction port 3 provided on the upper surface of the housing 1 a of the indoor unit 1, and sends the air exchanged by the heat exchanger 2 from the blower outlet 4. Discharge.
  • the example shown in FIG. 1 is an example of the air conditioner for computers which blows off from a free access floor (under the floor), the positions of the inlet 3 and the outlet 4 may be appropriately changed according to the use. .
  • FIG. 2 is a diagram (a front view (a), a side view (b), and a bottom view (c)) schematically showing the appearance of the housing 1a of the indoor unit 1 in FIG.
  • a plurality of service panels 7 are attached to the front and side of the housing 1a.
  • the service panel 7 is a removable panel. For example, when the maintenance of the indoor unit 1 is performed, the service panel 7 is removed from the casing 1a of the indoor unit 1, and when the maintenance is completed, the service panel 7 is attached to the casing 1a of the indoor unit 1.
  • the arrangement of the service panel 7 is not limited to the example of FIG. 2 and is appropriately provided according to the maintenance site in the housing 1a.
  • FIG. 3 is a schematic block diagram showing a control system of the indoor unit 1 of FIG.
  • the indoor unit 1 includes a microcomputer 6.
  • the microcomputer 6 has functions of a protection device 6a and a control unit 6b.
  • the microcomputer 6 receives signals from the sensor 8 and the current detector 10.
  • the signal from the sensor 8 is a signal corresponding to the removal of the service panel 7.
  • the signal from the current detector 10 is a signal indicating the drive current of the blower 5.
  • the control output of the microcomputer 6 is supplied to the inverter circuit 15.
  • the inverter circuit 15 drives the blower 5.
  • the control unit 6b and the inverter circuit 15 correspond to the control device 20 of the present invention.
  • the temperature sensor 10a is shown in FIG. 3, it is used in the following description and will be ignored in the description here. This also applies to FIGS. 6, 8, and 10 described later.
  • the protective device 6a is set to the operating current 6c, and when the driving current of the blower 5 exceeds the operating current 6c, the protective device 6a is stopped by the inverter circuit 15 via the control unit 6b (or directly). Is supplied to stop the operation of the blower 5. However, in the first embodiment, it is considered that the protection device 6a does not operate during maintenance.
  • control unit 6b When the control unit 6b receives a signal indicating that the service panel 7 has been removed from the sensor 8, the control unit 6b causes the inverter circuit 15 to reduce the frequency of the drive current of the blower 5. Thereafter, when the control unit 6b receives a signal to which the service panel 7 is attached from the sensor 8, the control unit 6b controls the inverter circuit 15 to restore the frequency of the drive current of the blower 5 to the original state. As a result, the current value detected by the current detector 10 does not exceed the operating current 6c set in advance in the protection device 6a, so that the drive can be continued without stopping the blower 5.
  • a predetermined value is set in the control device 20 in advance as the frequency to be changed. For example, when determining the set value of the frequency, assuming that the in-machine pressure loss of the indoor unit 1 decreases by 60 Pa and the current value increases by 2 A when the service panel 7 is removed, the frequency for decreasing the increase is measured in advance. By reducing the amount of the measured frequency when the service panel 7 is removed, it is possible to minimize the reduction in the capacity of the air conditioner.
  • the frequency can be set appropriately. For example, if the current value during normal operation is set to 10A, the current value at which the protective device operates is set to 12A, and the current value increases by 2A when the service panel 7 is removed, the frequency of the drive device is determined by a test performed in advance. If it is known that the current value is reduced by 2 A when the current is reduced by 2 Hz, the driving device is designed so that the decrease in the performance of the air conditioner is minimized within a range not exceeding 12 A of the current value at which the protective device 6 a operates. This frequency may be reduced by 1 to 2 Hz.
  • FIG. 4 is a flowchart for explaining the control operation of the indoor unit 1 according to the first embodiment of the present invention. Hereinafter, based on each step of FIG. 4, it demonstrates, referring FIG.
  • the current value detected by the current detector 10 is reduced by reducing the frequency of the drive current of the blower 5 by decreasing the frequency of the drive current of the blower 5 during maintenance.
  • the operating current 6c is not exceeded. Therefore, even when the service panel 7 is removed and maintenance work is performed, the driving of the blower 5, that is, the operation of the indoor unit 1 can be continued.
  • it is not necessary to stop the operation of the indoor unit 1, and there is no redundancy in capacity, and maintenance can be performed even when the operation of the indoor unit 1 cannot be stopped.
  • it is not necessary to stop the indoor unit 1 when performing maintenance not directly related to the rotation of the blower 5 such as inspection of the float switch, switching of DipSW, switching of contact input, and filter replacement.
  • the protection device 6a is controlled to operate when the driving current of the blower 5 exceeds the operating current 6c, but the operating temperature 6c is set to the protecting device 6a instead of the operating current 6c. You may do it.
  • a form in which the protection device 6a is activated when the temperature of the fan motor 5a of the blower 5 detected by the temperature sensor 10a (see FIG. 3) exceeds the operating temperature 6c is also included in the present invention. Also in this case, when the service panel 7 is removed, the frequency of the drive current of the blower 5 is reduced in the same manner as in the above example.
  • the temperature sensor 10a corresponds to “temperature detection means” in the present invention.
  • FIG. FIG. 5 is a front view schematically showing the configuration of the indoor unit 1 according to Embodiment 2 of the present invention.
  • the operation of the protection device 6a due to the decrease in the frequency of the blower 5 is prevented.
  • the air path resistance is adjusted instead, and the operation of the protection device 6a is performed. The form which prevents is demonstrated.
  • the indoor unit 1 in FIG. 5 is different from the indoor unit 1 in FIG. 1 in that a vane 12 provided at the outlet 4 and a vane drive motor 13 are added.
  • the vane 12 is rotatably provided at the air outlet 4 and adjusts the flow direction of the air discharged from the air outlet 4 by controlling the rotation of the vane drive motor 13.
  • the air outlet 4 is controlled to be closed during maintenance work, and the air outlet 4 is controlled to be released when the maintenance work is completed.
  • FIG. 6 is a schematic block diagram showing an indoor unit control system according to Embodiment 2 of the present invention.
  • a vane drive circuit 16 and two vane drive motors 13 driven by the vane drive circuit 16 are added in comparison with FIG.
  • the control unit 6b, the inverter circuit 15 and the vane drive circuit 16 constitute the control device 20 of the present invention.
  • control unit 6 b When the control unit 6 b receives a signal indicating that the service panel 7 has been removed from the sensor 8, the control unit 6 b drives the vane drive circuit 16 to drive the vane drive motor 13 and controls the vane 12 to rotate in the direction of closing the outlet 4. Thereafter, when the control unit 6b receives a signal to which the service panel 7 is attached from the sensor 8, the control unit 6b controls the rotation of the vane drive circuit 16 to drive the vane drive motor 13 so that the angle of the vane 12 is restored.
  • the in-machine pressure loss of the indoor unit 1 decreases. At this time, by changing the vane angle in a direction to close the outlet 4, the out-of-machine pressure loss of the indoor unit 1 is increased and the blower is driven. An increase in current frequency can be suppressed.
  • FIG. 7 is a flowchart for explaining the control operation of the indoor unit 1 according to Embodiment 2 of the present invention. Hereinafter, based on each step of FIG. 7, it demonstrates, referring FIG.
  • the control unit 6b takes in a signal from the sensor 8 and outputs a control signal for causing the vane drive circuit 16 to control the rotation of the vane 12 in the direction of closing the outlet 4.
  • the vane drive circuit 16 controls the rotation of the vane 12 in a direction to close the air outlet 4.
  • the sensor 8 When the maintenance is completed and the service panel 7 is attached, the sensor 8 outputs a signal corresponding to the sensor.
  • the control unit 6b takes in a signal from the sensor 8 and outputs a control signal for causing the vane drive circuit 16 to perform rotation control in a direction to return the angle of the vane 12 to the original state.
  • the vane drive circuit 16 controls the rotation of the vane 12 so that the angle of the vane 12 is restored.
  • the current value detected by the current detector 10 is prevented by increasing the internal pressure loss of the indoor unit 1 due to the removal of the service panel 7 during maintenance, blocking the outlet 4 and increasing the external pressure loss of the indoor unit. Does not exceed the operating current 6c of the protective device 6a. Therefore, even when the service panel 7 is removed and maintenance work is performed, the driving of the blower 5, that is, the operation of the indoor unit 1 can be continued.
  • the protection device 6a is controlled to operate when the driving current of the blower 5 exceeds the operating current 6c, but the operating temperature 6c is set to the protecting device 6a instead of the operating current 6c. You may do it.
  • a form in which the protection device 6a is activated when the temperature of the fan motor 5a of the blower 5 detected by the temperature sensor 10a (see FIG. 6) exceeds the operating temperature 6c is also included in the present invention. Also in this case, when the service panel 7 is removed, the vane 12 is controlled to rotate in a direction to close the outlet 4 as in the above example.
  • the motor since the external static pressure is increased by blocking the air outlet 4 without changing the frequency of the fan motor 5a and the increase in the current value is suppressed, the motor is not an inverter drive motor. It is also effective for constant speed motors.
  • FIG. FIG. 8 is a schematic block diagram showing an indoor unit control system according to Embodiment 3 of the present invention.
  • Embodiment 1 described above is an example in which the frequency of the drive current that is the output of the inverter circuit 15 is reduced.
  • the operating current 6c of the protection device 6a is changed during maintenance. Is different. For this reason, in Embodiment 3, the operating current 6c of the protection device 6a is rewritten to a large value during maintenance.
  • the operating current 6c (and operating temperature 6c) of the protection device 6a is often set to prevent the fan motor 5a from failing when an overcurrent continues for a long time. There are many cases where there is no problem even if the operating current 6c is increased. Work that involves removing the service panel 7 without stopping the operation of the indoor unit 1 includes float switch maintenance, DipSW change, contact port output, filter replacement, etc., all of which work in a short time. is there. Therefore, for example, after removing the service panel 7, it is possible to introduce a control for increasing the maximum allowable value by 10% for 10 minutes.
  • FIG. 9 is a flowchart illustrating the control operation of the indoor unit 1 according to the third embodiment of the present invention.
  • S300 When the service panel 7 is removed during the operation of the air conditioner, the sensor 8 outputs a signal in response thereto.
  • the control unit 6b takes in the signal from the sensor 8 and rewrites the operating current 6c of the protection device 6a to a large value.
  • S302 The designated time elapses after the control unit 6b takes in the signal from the sensor 8.
  • S303 When the maintenance is completed and the service panel 7 is attached, the sensor 8 outputs a signal corresponding to the sensor.
  • S304 The control unit 6b takes in the signal from the sensor 8 and returns the operating current 6c of the protection device 6a to the original value.
  • the service panel 7 can be attached and detached even during operation without reactivating the protection device 6a by rewriting the operating current 6c at which the protection device 6a operates to a large value.
  • the protection device 6a is controlled to operate when the driving current of the blower 5 exceeds the operating current 6c, but the operating temperature 6c is set to the protecting device 6a instead of the operating current 6c. You may do it.
  • a form in which the protective device 6a is activated when the temperature of the fan motor 5a of the blower 5 detected by the temperature sensor 10a (see FIG. 8) exceeds the operating temperature 6c is also included in the present invention. Also in this case, when the service panel 7 is removed, the operating temperature 6c is rewritten to a large value as in the above example.
  • FIG. 10 is a schematic block diagram showing an indoor unit control system according to Embodiment 4 of the present invention.
  • the operation unit 17 is provided with a maintenance mode and is operated. Therefore, it is determined that maintenance work is in progress.
  • FIG. 11 is a flowchart illustrating the control operation of the indoor unit 1 according to the fourth embodiment of the present invention. Hereinafter, based on each step of FIG. 11, it demonstrates, referring FIG.
  • the current detector 10 detects an increase in the current value and outputs a signal in response thereto.
  • the control unit 6b takes in the signal from the current detector 10 and outputs a control signal for reducing the frequency to the inverter circuit 15, and controls the rotation of the vane 12 in the direction in which the vane 12 is closed in the vane drive circuit 16. The control signal for making it output is output.
  • the inverter circuit 15 lowers the frequency of the blower 5, and the vane drive circuit 16 controls the rotation of the vane 12 in the direction of closing the outlet 4.
  • S403 The current detector 10 detects that the current value returns to the normal value, and outputs a signal in response thereto.
  • the control unit 6b takes in the signal from the current detector 10 and outputs a control signal for reducing the frequency to the inverter circuit 15, and controls the rotation of the vane 12 in the direction in which the vane 12 is closed in the vane drive circuit 16.
  • the control signal for making it output is output.
  • the inverter circuit 15 restores the frequency of the blower 5 and the vane drive circuit 16 controls the rotation of the vane 12 in the direction to restore the angle.
  • control for changing the frequency of the blower 5 and the angle of the vane 12 is performed.
  • either one of the controls may be performed.
  • the protection device 6a when the driving current of the blower 5 exceeds the operating current 6c, the protection device 6a is controlled. However, instead of the operating current 6c, the operating temperature 6c is changed to the protecting device 6a. You may make it set. A form in which the protective device 6a is activated when the temperature of the fan motor 5a of the blower 5 detected by the temperature sensor 10a (see FIG. 10) exceeds the operating temperature 6c is also included in the present invention. Also in this case, when the service panel 7 is removed, the operating temperature 6c is rewritten to a large value as in the above example.
  • the senor is described, but the sensor refers to a sensor that can detect removal of the service panel, such as a proximity sensor such as a contact sensor and a touch sensor.
  • the service panel includes a panel that is removed when performing maintenance of a service window, a service door, and the like.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne la fourniture d'une fonction qui, pendant la maintenance, permet à une unité d'intérieur de continuer à fonctionner sans arrêter un dispositif d'entraînement pour une soufflante d'air. Une unité d'intérieur pour un dispositif de conditionnement d'air comprend : un boîtier (1a) pourvu d'une ouverture d'aspiration (3), d'une ouverture d'évacuation (4) et d'un panneau de service (7) qui est enlevé à des fins de maintenance ; un échangeur de chaleur (2) monté à l'intérieur du boîtier (1a) ; une soufflante d'air (5) agencée à l'intérieur du logement (1a) et conçue de sorte que la soufflante d'air (5) aspire de l'air depuis l'ouverture d'aspiration (3) et évacue l'air depuis l'ouverture de d'évacuation (4) après avoir amené l'air à passer à travers l'échangeur de chaleur (2) ; un dispositif de commande (20) pour commander la soufflante d'air (5) ; et un dispositif de protection (6a) permettant d'arrêter le fonctionnement de la soufflante d'air (5) et de protéger la soufflante d'air (5). Pendant la maintenance, le dispositif de commande (20) empêche le dispositif de protection (6a) de fonctionner et permet à la soufflante d'air (5) de continuer à fonctionner.
PCT/JP2014/059984 2014-04-04 2014-04-04 Unité d'intérieur pour dispositif de conditionnement d'air WO2015151280A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/059984 WO2015151280A1 (fr) 2014-04-04 2014-04-04 Unité d'intérieur pour dispositif de conditionnement d'air

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/059984 WO2015151280A1 (fr) 2014-04-04 2014-04-04 Unité d'intérieur pour dispositif de conditionnement d'air

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1151454A (ja) * 1997-08-06 1999-02-26 Fujitsu General Ltd 空気調和機の制御方法
JP2006029687A (ja) * 2004-07-16 2006-02-02 Mitsubishi Electric Corp 空気調和機の制御装置、空気調和機の制御表示装置
JP2008217229A (ja) * 2007-03-01 2008-09-18 Daikin Ind Ltd 機器管理装置および機器管理システム
JP2012122645A (ja) * 2010-12-07 2012-06-28 Mitsubishi Electric Corp 空気調和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1151454A (ja) * 1997-08-06 1999-02-26 Fujitsu General Ltd 空気調和機の制御方法
JP2006029687A (ja) * 2004-07-16 2006-02-02 Mitsubishi Electric Corp 空気調和機の制御装置、空気調和機の制御表示装置
JP2008217229A (ja) * 2007-03-01 2008-09-18 Daikin Ind Ltd 機器管理装置および機器管理システム
JP2012122645A (ja) * 2010-12-07 2012-06-28 Mitsubishi Electric Corp 空気調和装置

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