JP5326666B2 - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a heat pump heating operation by a refrigerating cycle that it takes not a little time from an instruction for starting a heating operation by a user to the supply of warm air from a supply opening, and heating equipment is not functioned in a standby time. <P>SOLUTION: This air conditioning device includes a crossflow fan 2 having conductive property, disposed in an indoor unit body, sucking the indoor air from a suction opening, and blowing off the same from the supply opening, and an induction heating coil 1 which is disposed near the crossflow fan, and to which the AC current of high frequency is supplied. The AC current of high frequency is supplied to the induction heating coil, the crossflow fan is electromagnetically induction-heated while rotated, and the indoor air heated by heat transfer by the electromagnetically induction-heated crossflow fan is supplied from the supply opening in a preparation time of the heat pump heating operation. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a heat pump type air conditioner that includes an indoor unit and an outdoor unit and has a refrigeration cycle in which refrigerant is circulated by a compressor, and particularly relates to a heating operation.

  A heat pump type air conditioner that uses a refrigeration cycle that compresses and circulates refrigerant in a compressor installed in an outdoor unit, absorbs heat from a low-temperature heat source, and exhausts heat to a high-temperature heat source. Fossil fuel (oil, gas, etc.) Compared with a heating device that directly burns CO2 and emits CO2 (carbon dioxide), it can be said that it is a heating device that can contribute to the prevention of global warming by effectively using the heat of the atmosphere that exists in nature. However, in the heating operation of the heat pump air conditioner, it is said that it takes time from the operation start instruction of the user to the start-up of the heating (warm air blowing), as compared with the heating device that directly burns fossil fuel.

  This is because a compressor that compresses and circulates refrigerant has refrigerating machine oil that lubricates and seals the compression mechanism inside the hermetic container, and the refrigerating machine oil is compressed out of the hermetic container together with the compressed refrigerant. This is because the operation cannot be started suddenly at a high rotational speed in order to avoid the outflow, and the rotational speed must be gradually increased from a low rotational speed of about 10 rps.

  In particular, in winter when heating operation is required, the compressor being stopped is cooled by outside air, and a large amount of refrigerant liquefied into the compressor's sealed container is in a so-called liquid refrigerant stagnation state, When starting the compressor from such a state, if it is suddenly started at a high speed, the refrigeration oil is taken out of the sealed container together with the rapidly gasified refrigerant. In the worst case, This is because the refrigerating machine oil is depleted and the compression mechanism section is poorly lubricated and the compressor cannot be operated.

  In addition, indoor heat exchangers that are installed inside the main unit of an indoor unit and heat the indoor air by exchanging heat with refrigerant during heating operation have a large heat capacity, so that the air conditioner can be used in a situation where the temperature of the room in which the indoor unit is installed is low. One of the factors that takes time until the start of heat pump heating by the refrigeration cycle is that it is difficult to warm up even after the operation of the refrigeration cycle is started after the apparatus has been stopped for a long time.

  Therefore, even if the user instructs the air conditioner to start the heating operation using, for example, a remote controller, immediately after the start of the operation, the compressor starts to start at a low speed as described above, so that the refrigerant circulation in the refrigeration cycle The amount of the indoor heat exchanger is small, and the heat capacity of the indoor heat exchanger is not immediately heated by the condensation heat of the high-pressure refrigerant. Therefore, the indoor fan is not rotated simultaneously with the start of the heating operation.

  The indoor fan is arranged inside the indoor unit on the downstream side of the indoor heat exchanger. When the indoor fan is driven to rotate, indoor air is sucked into the indoor unit through the intake port and passes through the indoor heat exchanger. At that time, heat is exchanged with the refrigerant circulating in the indoor heat exchanger to become conditioned air, that is, warming operation is heated and warm air, and cooling operation is cooled and cool air. It is blown out from the exit into the room.

  If the indoor fan is driven to rotate, an air flow is inevitably created that is sucked from the suction port and blown from the blower outlet. Immediately after the start of heating operation, the indoor heat exchanger has a low ability to generate warm air by warming the indoor air as described above. If unwarranted air is blown out and such unwarm blown air directly hits the user requesting the heating operation, it may cause a great discomfort to the user. Become.

  Therefore, the indoor fan is not rotated simultaneously with the start of the heating operation, for example, when the temperature of the indoor heat exchanger measured by the temperature sensor rises to a preset value, that is, Even if the user instructs the start of the heating operation by controlling the indoor fan to rotate when the indoor heat exchanger can generate hot air, the compressor is activated and the refrigeration is started. Even if the cycle begins to operate, hot air is not immediately blown out from the outlet of the indoor unit.

  Depending on the temperature of the indoor heat exchanger at the time of instructing the start of heating operation, for example, when the air conditioner is stopped overnight in winter and the heating operation is started the next morning, That is, it takes some time before warm air blows out from the outlet. This waiting time (the time from the instruction to start the heating operation until the warm air blows out from the outlet) is, from the user's standpoint, that the air conditioner is not functioning as a heating device. is there.

  Especially in cold regions, this waiting time in winter is very frustrating for the user. However, if the timer function is used to start the operation early, the air conditioner is operated even though the user is not in the room, and the energy saving performance is impaired.

  Therefore, in order to shorten the waiting time until the heat pump heating is started, an induction heating coil is installed in a compressor or an indoor heat exchanger, and the metal in contact with the refrigerant is heated by electromagnetic induction heating to heat the refrigerant. An air conditioner has been proposed that accelerates the rise of the air. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 11-341813 (column 0037, FIGS. 3 and 4)

  However, as disclosed in Patent Document 1 described above, even if the induction heating coil electromagnetically heats the compressor or the indoor heat exchanger, the compressor or the indoor heat exchanger has a large heat capacity. Can not raise the temperature of the refrigerant.

  In addition, in electromagnetic induction heating, when an alternating current is passed through an induction heating coil, eddy current is generated in the metal located near the coil, and Joule heat is generated due to the electrical resistance of the metal, and the metal is heated. However, the effect of induction heating is low for metals with low electrical resistance such as aluminum and copper. An indoor heat exchanger of an air conditioner is usually inserted in a meandering manner in a plurality of rows of aluminum fins arranged in parallel to each other and in a plurality of rows passing through the aluminum fins. Fins that are made up of copper tubes installed (generally called fin-and-tube heat exchangers), in which room air flows between the fins, and heat is transferred from the refrigerant flowing in the copper tubes Heat exchange in contact with copper pipes.

  As described above, the indoor heat exchanger is basically composed of aluminum and copper, which are metals having low electric resistance, so even if an electric current is passed through the induction heating coil to cause electromagnetic induction heating of the indoor heat exchanger. The heating effect is low, and the indoor heat exchanger cannot be heated in a short time.

  From the above, in the air conditioner disclosed in Patent Document 1, even if the induction heating coil electromagnetically heats the compressor or the indoor heat exchanger, the temperature cannot be increased in a short time. The temperature of the refrigerant in contact with the metal of the compressor or indoor heat exchanger cannot be increased in a short time, and the time until the heat pump heating starts up, in other words, the warm air from the user's instruction to start the heating operation. There is a problem that the effect of shortening the time until the air blows out from the air outlet cannot be sufficiently obtained, and the user is not satisfied.

  The present invention has been made to solve the above-described problems. In the heating operation of the heat pump type air conditioner, warm air that satisfies the user's warmth blows from the user's instruction to start the heating operation. An object of the present invention is to provide an air conditioner capable of shortening the time from the outlet to the blowout.

  Another object of the present invention is to provide an air conditioner that can blow out hot air even during the defrosting operation during the heating operation of the heat pump air conditioner.

  Another object of the present invention is to provide an air conditioner capable of performing a dehumidifying operation capable of suppressing a decrease in room temperature due to a dehumidifying operation of a heat pump air conditioner and shortening a time required to reach a target humidity.

  It is another object of the present invention to provide an air conditioner capable of preventing mold from being generated by moisture adhering to a cross flow fan after a cooling operation or a dehumidifying operation of a heat pump air conditioner.

An air conditioner according to the present invention is an air conditioner having an indoor unit and an outdoor unit each having a heat exchanger, and a refrigeration cycle in which refrigerant is circulated by a compressor installed in the outdoor unit. A control device for controlling the operation of the air conditioner, an outer casing of the indoor unit, a casing having an air inlet and an outlet, and a conductive body, A cross flow fan that is installed and sucks indoor air from the inlet and blows out from the outlet, and an induction heating coil that is arranged in the vicinity of the cross flow fan and is supplied with a high-frequency alternating current, , it performs control to operate a refrigeration cycle by starting the compressor, rotate the cross-flow fan, and supplies the alternating current of the high frequency induction heating coil, by refrigeration cycle To the heat pump heating operation preparation time until Toponpu heating rises, while rotating the cross flow fan and an electromagnetic induction heating, the indoor air heated by the heat transfer of the crossflow fan is electromagnetic induction heating as it passes through the cross flow fan When the electromagnetic induction heating is performed while rotating the cross flow fan during the heat pump heating operation preparation time, the control device sets the rotational speed of the cross flow fan for a predetermined time from the start of the electromagnetic induction heating. The control is performed so that the rotation speed is low without the air blowing action and is increased to the rotation speed with the air blowing action after a predetermined time has elapsed .

In the air conditioner of the present invention, when the start of heating operation is instructed, the control device performs electromagnetic induction heating while rotating the conductive cross flow fan, whereby the heat pump heating until the heat pump heating by the refrigeration cycle starts up During operation preparation time, the air heated by heat transfer from the electromagnetic induction heated crossflow fan can be blown out as hot air from the air outlet, so that the hot air is emitted from the air outlet from the user's start instruction for heating operation. The time until blowing out can be shortened, and there is an effect that it is possible for the user to provide an air conditioner that is excellent in comfort of heating operation.

It is a longitudinal cross-sectional view of the indoor unit of the air conditioning apparatus in Embodiment 1 of this invention. It is a perspective view which illustrates typically the internal structure of the indoor unit of the air conditioning apparatus in Embodiment 1 of this invention. It is a perspective view of the crossflow fan mounted in the indoor unit of the air conditioning apparatus in Embodiment 1 of this invention. It is attachment explanatory drawing of the crossflow fan of FIG. It is a schematic diagram which shows the structure of the refrigerating cycle of the air conditioning apparatus in Embodiment 1 of this invention. It is the graph which compared the blowing temperature rise value at the time of electromagnetic induction heating of a cross flow fan, and the case of electromagnetic induction heating of an indoor heat exchanger. It is a characteristic view which shows the operation data of the air conditioning apparatus in Embodiment 1. It is a graph which shows the generated pressure with respect to the rotation speed at the time of rotating a cross flow fan. It is a graph of the test result which shows the change of the surface temperature and blowing temperature of a crossflow fan at the time of preheating the crossflow fan of the air conditioning apparatus in Embodiment 2 of this invention. It is a characteristic view which shows the driving | running control method of the fan motor for implement | achieving the non-blast rotation of a crossflow fan. It is a longitudinal cross-sectional view of the indoor unit of the air conditioning apparatus in Embodiment 3 of this invention.

Embodiment 1 FIG.
1 to 7 are diagrams showing the first embodiment. FIG. 1 is a longitudinal sectional view of the indoor unit 101 of the air conditioner 100. FIG. 2 is a perspective view schematically illustrating the internal configuration of the indoor unit 101. 2 is a longitudinal sectional view of the internal configuration shown in FIG. FIG. 3 is a perspective view of the cross flow fan 2 that is an indoor fan, and FIG. 4 is an explanatory view of attachment of the cross flow fan 2. FIG. 5 is a schematic diagram showing the configuration of the refrigeration cycle of the air conditioner 100. 6 and 7 are graphs showing the operation data, respectively.

  The air conditioner 100 according to the present embodiment includes an indoor unit 101 and an outdoor unit 102, which are connected by a refrigerant pipe to form a refrigeration cycle (heat pump cycle), and their respective control devices 60 and 80. Is a so-called separate type air conditioner connected by a power line or a signal line 61. In particular, since the configuration of the indoor unit 101 is characteristic, the indoor unit 101 will be described in detail below, and the detailed description of the outdoor unit 102 will be omitted.

  An indoor unit 101 shown in FIG. 1 is an indoor unit of a home air conditioner (generally called a room air conditioner), is a wall-mounted type, and is installed on the upper wall surface of a room (indoor) to be air-conditioned. Is.

  1 and 2, an indoor unit 101 has a suction port 4 at an upper portion and a blower outlet 5 at a lower portion, and a housing 10 that constitutes an outline of the indoor unit 101, and is installed in the housing 10. The cross flow fan 2 that sucks indoor air from the inlet 4 and finally blows out the indoor air from the outlet 5 into the room, and the upstream side of the cross flow fan 2 in the air path formed by the cross flow fan 2. Is arranged between the indoor heat exchanger 3 that harmonizes the sucked indoor air and generates conditioned air (for example, warms the indoor air in the case of heating operation), and the suction port 4 and the indoor heat exchanger 3. The up-and-down wind direction which adjusts the wind direction of the conditioned air (blowing air) which is arrange | positioned in the vicinity of the blower outlet 5 in the housing | casing 10 and the filter 6 which captures the dust contained in the sucked indoor air A control plate 7 and the left and right air direction control board 8 will be described in detail later, includes an induction heating coil 1 to the cross flow fan 2 is electromagnetic induction heating, the.

  Although not shown, a microcomputer is mounted on an indoor control board installed in the main body of the indoor unit 101, and this microcomputer becomes the indoor control device 60, which receives instructions from the user and various sensors. Based on the information and preset values stored in advance, rotation control of the cross flow fan 2 and rotation control of the up / down air direction control plate 7 and the left / right air direction control plate 8 are performed according to a set program. The indoor control device 60 also controls the supply of electric power to the induction heating coil 1 and the stop thereof. The indoor control device 60 communicates with the outdoor control device 80, which is also a microcomputer mounted on the outdoor control board installed in the outdoor unit 102, via the signal line 61, and exchanges information with each other. ing.

  The indoor heat exchanger 3 is of a fin-and-tube type, and includes a plurality of thin plate-like aluminum fins 31 arranged so as to be parallel to each other and a plurality of rows passing through the aluminum fins 31. The copper pipe 32 is inserted in a meandering manner, and the front lower heat exchanger 3a is located at the lower front side of the indoor unit 101, the front upper heat exchanger 3b is located at the upper front side, and the rear side is located. And a rear heat exchanger 3c. The indoor heat exchanger 3 is arranged between the suction port 4 and the cross flow fan 2 so as to surround the cross flow fan 2, and harmonizes (cools, dehumidifies, heats) the indoor air sucked from the suction port 4. To produce conditioned air. In addition, arrangement | positioning of the indoor heat exchanger 3 is not limited to this form, For example, it is not necessary to provide the back surface heat exchanger 3c.

  The up / down air direction control plate 7 is rotated in the up / down direction to adjust the up / down direction of the blown air, and the left / right air direction control plate 8 is turned up / down to adjust the left / right direction of the blown air. When the operation of the air conditioner 100 is stopped, the up / down air direction control plate 7 rotates so as to close the air outlet 5, and closes the air outlet 5 while the air conditioner 100 is stopped. The up-and-down air direction control plate 7 has a plate shape that is long in the left-right direction. In this indoor unit 101, as shown in FIG. 1, two pieces are installed in the front-rear direction of the main body of the indoor unit 101. It may also be a configuration divided into two in the left-right direction.

  And the crossflow fan 2 arrange | positioned a little below from the center part by the side view of the housing | casing 10 (indoor unit 101 main body) is formed long in a substantially cylindrical shape in the direction of the rotation centerline P, as shown in FIG. It is installed so that the longitudinal direction (direction of the rotation center line P) is the left-right direction of the main body of the indoor unit 101. And it rotates to the direction of the arrow W of FIG. 1, performs the ventilation effect | action which sucks in from the suction inlet 4 and blows off from the blower outlet 5. FIG. That is, an air flow is generated in the air passage of the cross flow fan 2.

  The cross flow fan 2 includes a plurality of blades 22 arranged at unequal pitches in the rotation direction between a plurality of annular flat plates 21 arranged in parallel in the longitudinal direction. As shown in FIGS. 2 and 4, a fan motor 45 that rotationally drives the cross flow fan 2 is disposed on one side of the cross flow fan 2. The fan motor 45 is disposed inside the housing 10 and is not exposed even if the user opens the front opening / closing panel 11 that opens and closes by rotating up and down with the upper portion of the housing 10 as a fulcrum. A connecting boss 23 for connecting the drive shaft 45a of the fan motor 45 is fixed at the center of the end plate 24 (motor side end plate 24) on the side where the fan motor 45 is disposed (hereinafter referred to as the motor side). Yes.

  A rotation shaft 26 of the cross flow fan 2 is provided on the other side of the cross flow fan 2 that is opposite to the side where the fan motor 23 is disposed. The rotating shaft 26 is fixed to the center of the end plate 25 (the non-motor side end plate 25) on the other side (hereinafter referred to as the non-motor side), and the rotating shaft 26 is formed on the side wall of the housing 10. Is fitted to the bearing portion 10a.

  When the fan motor 45 is driven to rotate, the cross flow fan 2 rotates in synchronization via the drive shaft 45a and the connecting boss 23. In synchronization with the rotation of the cross flow fan 2, the rotating shaft 26 also rotates, and the rotating rotating shaft 26 is supported by the bearing portion 10a. In addition, the annular flat plate 21 may be bonded to the central space area, for example, in the vicinity of the center, and may be formed with ribs extending radially from there to the inner diameter of the annular ring to increase the strength.

  Here, the cross flow fan 2 in the present embodiment uses iron as a material for the annular flat plate 21, the motor side end plate 24, the non-motor side end plate 25, and the blades 22. The reason why these are made of iron is to form the cross flow fan 2 so as to have conductivity and to perform electromagnetic induction heating, which will be described in detail later.

  The cross flow fan 2 is manufactured by fixing a plurality of iron blades 22 to the opposing iron annular plate 21, the motor side end plate 24, and the counter motor side end plate 25 by press-fitting or caulking. However, the connecting boss 23 is fixed to the motor-side end plate 24 and the rotating shaft 26 is fixed to the counter-motor-side end plate 25 by press-fitting or caulking in advance. The connecting boss 23 and the rotary shaft 26 may be fixed to the corresponding end plates 24 and 26 by press-fitting or caulking from the state where the blades 22 are fixed.

  Here, the connecting boss 23 and the rotating shaft 26 are each formed using an insulating material that is not conductive or has minimal conductivity. For example, ceramic, rubber, heat resistant resin or the like is used. Insulating materials usually have a low thermal conductivity, so that they also function as heat insulating materials. In this way, the connection boss 23 and the rotary shaft 26 are formed by using an insulating material so that current and heat are not transmitted from the cross flow fan 2 having conductivity that is heated by electromagnetic induction to the indoor unit 101 main body and the fan motor 45. It is for doing so.

  The motor drive shaft 45 a is connected and fixed to the connection boss 23, and these connection and fixing are performed by press-fitting the motor drive shaft 45 a into the inner diameter of the connection boss 23. In addition, the connection fixation of the motor drive shaft 45a to the connection boss 23 fixed to the center of the motor side end plate 24 is not limited to press-fitting. For example, key grooves may be formed in the connecting boss 23 and the motor drive shaft 45a, and a key may be inserted into these key grooves to be connected. However, in this case, it is necessary to form the key with an insulating material like the connection boss 23. Thus, any connection structure that can rotate the crossflow fan 2 in synchronization with the rotation of the motor drive shaft 45a via the connection boss 23 may be used.

  Further, the blade 22 is fixed to the annular flat plate 21 and the end plates 24 and 25 by press-fitting or caulking. However, these fixings are not limited to press-fitting or caulking, and may be welded. However, press fitting, caulking, and welding may be used in combination.

  Generally speaking, a cross-flow fan excludes a fan motor and its drive shaft, but is fixed to a connecting boss that is fixed to the motor side end plate and to which the fan motor drive shaft is connected and fixed to the non-motor side end plate. The rotation shaft that is rotatably supported by the bearing portion of the indoor unit main body is included as a component. In this embodiment, the cross flow fan 2 includes the fan motor 45 and its drive shaft 45a. In addition, a plurality of blades 22 and a plurality of annular flat plates 21 made of iron, a motor-side end plate 24, and a non-motor-side end The part constituted by the plate 25 shall be indicated. That is, only the part which consists of iron parts and has electroconductivity is defined as the cross flow fan 2.

  For this reason, it can be said that the cross flow fan 2 is made of iron. Currently, most of the crossflow fans mounted on indoor units of room air conditioners that are commercially available are resin-molded, but the crossflow fan 2 of the present embodiment is heated by electromagnetic induction, It is made of conductive iron. Although the details will be described later, the material of the cross flow fan 2 is not limited to iron, and may be other metal as long as it is conductive. You may comprise so that electroconductivity may be given.

  From the cross flow fan 2 to the blower outlet 5, there is a blower side air passage 51. The blow-out side air passage 51 is formed by a casing 9 having a curved rear side as shown in FIG. 1 and a nozzle 12 having a front side located below the front lower heat exchanger 3a. A housing recess 91 is formed in the vicinity of the cross flow fan 2 of the casing 9 constituting the back surface of the blow-out side air passage 51.

  The storage recess 91 is provided in the casing 9 so as to be recessed toward the back surface of the main body of the indoor unit 101, and is approximately the same length as the length of the cross flow fan 2 in the longitudinal direction. It is provided so as to extend in the same direction, that is, to be elongated in the left-right direction of the indoor unit 101 main body.

  And in this accommodation recessed part 91, the induction heating coil 1 which electromagnetically heats the iron crossflow fan 2 is accommodated. When the induction heating coil 1 is supplied with a high-frequency alternating current, the induction heating coil 1 generates heat and becomes high temperature, so that the heat is transferred to the casing 9 formed of resin, causing the casing 9 to undergo thermal deformation and thermal fatigue. In order to avoid this, a heat insulating material 92 is installed between the bottom surface of the housing recess 91 and the four inner walls and the induction heating coil 1.

  In addition, it is good also as a structure which does not provide the heat insulating material 92 but shape | molds the casing 9 with a heat resistant resin, and gives the heat resistance with respect to the induction heating coil 1 which heat | fever-generated. Since the induction heating coil 1 is for electromagnetic induction heating of the iron cross flow fan 2, the casing 9 must not be formed of a conductive material.

  The induction heating coil 1 is configured by winding (winding) a plurality of elongated copper wires so as to extend in the longitudinal direction of the housing recess 91. The length in the longitudinal direction of the induction heating coil 1 housed in a circumferential shape in the housing recess 91 is somewhat shorter than the length of the housing recess 91. In FIG. 2, the induction heating coil 1 is depicted as a three-turn winding in a simplified manner, but the induction heating coil 1 in this embodiment has a copper wire of φ0.8 to φ1.0 wound for 20 to 30 turns. Is. However, the wire diameter of the copper wire is not limited to this, and if the wire diameter is different, the electrical resistance of the copper wire is different, so that the optimum number of turns (number of circumferential turns) changes accordingly.

  The induction heating coil 1 is housed in the housing recess 91 so as not to protrude into the discharge side air passage 51. If even a part of the induction heating coil 1 protrudes in the blowing side air passage 51, air blowing resistance of the air blown out from the blowout port 5 is generated. To avoid this, the induction heating coil 1 is connected to the discharge side wind. Do not project on the road 51.

  Moreover, in order for the induction heating coil 1 to shorten the distance from the crossflow fan 2 to be electromagnetically heated in a state in which the induction heating coil 1 does not protrude into the blowout side air passage 51, the end on the blowout side air passage 51 side is the blowout side air passage. The casing 9 is accommodated so as to be substantially flush with the surface of the casing 9 facing 51. As shown in FIG. 1, the induction heating coil 1 is also entirely curved and accommodated along the vertical curvature of the casing 9. When storing the induction heating coil 1 so as to be pressed against the bottom surface of the storage recess 91 that is curved along the curvature of the casing 9 (the heat insulating material on the bottom surface when the heat insulating material 92 is interposed), The induction heating coil 1 can be curved along the casing 9. Thereby, the induction heating coil 1 can be shortened in the distance from the cross flow fan 2 without projecting into the blowing side air passage 51 to become ventilation resistance.

  The induction heating coil 1 is connected at its front end and end to a current supply circuit 13, and a high frequency alternating current is supplied from this current supply circuit 13. The current supply circuit 13 is an inverter circuit, is mounted on the above-described indoor control board, and is controlled by the indoor control device 60. In this embodiment, a 26 kHz alternating current is supplied from the current supply circuit 13 to the induction heating coil 1.

  FIG. 5 is a schematic diagram showing the configuration of the refrigeration cycle of the air conditioner 100. In the outdoor unit 102, a low-pressure refrigerant is compressed and discharged as a high-temperature and high-pressure refrigerant, and the refrigerant is circulated in the refrigeration cycle. A compressor 70 is installed. The flow direction of the refrigerant compressed by the compressor 70 is switched by the four-way valve 71. In the cooling operation and the dehumidifying operation, the flow is such that the high-temperature and high-pressure refrigerant flows through the outdoor heat exchanger 72, and in the heating operation, the flow is such that the high-temperature and high-pressure refrigerant flows through the indoor heat exchanger 3. In the heating operation, the indoor heat exchanger 3 functions as a condenser and the outdoor heat exchanger 72 functions as an evaporator. Switching control of the flow direction of the four-way valve 71 is performed by the outdoor control device 80.

  The arrows in FIG. 5 indicate the flow direction of the refrigerant in the heating operation. In the heating operation, the condensed refrigerant that has passed through the indoor heat exchanger 3 is decompressed by the expansion valve 73, and the outdoor heat exchanger. It flows into 72, evaporates here, is compressed again with the compressor 70 after that, and repeats this cycle. The compressor 70 is an inverter compressor whose operating rotational speed is variable. In the vicinity of the outdoor heat exchanger 72, a propeller fan 74, which is an outdoor fan that allows outdoor air to pass through the outdoor heat exchanger 72 to promote heat exchange, is disposed. The propeller fan 74 also has a variable rotation speed.

  Here, R410A, which is an HFC mixed refrigerant, is used as the refrigerant that is the working fluid circulating in the refrigeration cycle. Moreover, the indoor unit 101 and the outdoor unit 102 are connected by connection piping 75a and 75b, and the circulation circuit as a refrigerating cycle is connected. The connection pipe 75a is a liquid-side connection pipe through which the refrigerant passes through the condensation process in the heating operation, and the connection pipe 75b is a gas-side connection pipe through which the refrigerant before flowing into the condensation process in the heating operation flows.

  For the operation control of the compressor 70 and the propeller fan 74, the flow path switching control of the four-way valve 71, the opening degree adjustment (adjustment of the degree of decompression) control of the expansion valve 73, the outdoor control device 80, which is a microcomputer, is controlled by the indoor control device 60. And while exchanging information via the signal line 61. On the outdoor control board on which the outdoor control device 80 is mounted, drive circuits for these control factors (such as the compressor 70 and the expansion valve 73) are mounted, and the outdoor control device 80 has individual drive circuits. Although each control factor is controlled by moving, illustration of such a drive circuit is omitted in FIG.

  Further, as described above, the indoor control device 60 controls the operation of the cross flow fan 2, the current supply control to the induction heating coil 1, and the rotation control of the left / right air direction control plate 8 and the up / down air direction control plate 7. This is performed while exchanging information via 80 and the signal line 61. In addition to the current supply circuit 13 of the induction heating coil 1, the control factors (cross flow fan 2, wind direction control plates 7, 8, etc.) are provided on the indoor control board on which the outdoor control device 80, which is a microcomputer, is mounted. ) Is mounted, and the indoor control device 60 controls each control factor by moving each drive circuit. In FIG. 5, such a drive circuit is illustrated in the current supply circuit 13. Omitted except for.

  Next, the operation of the air conditioner 100 in this embodiment will be described mainly with respect to the operation of the indoor unit 101. A user gives an instruction for heating operation to the air conditioner 100 by using the remote controller 15, and the remote control receiver 14 installed on the front surface of the indoor unit 101 receives the instruction signal, and the instruction is given to the indoor controller. When transmitted to 60, the indoor control device 60 communicates the information on the start of the heating operation to the outdoor control device 80, and the outdoor control device 80 activates the compressor 70 in response to the communication. The indoor control device 60 instructs the current supply circuit 13 to supply an alternating current to the induction heating coil 1 in parallel with the communication to the outdoor control device 80, and generates an alternating current to the induction heating coil 1. Supply. The induction heating coil 1 is supplied with a 26 kHz alternating current obtained through a current supply circuit 13 which is an inverter circuit. In this embodiment, the point in time when remote control receiver 14 receives the heating operation start instruction signal is the heating operation start.

  Furthermore, in parallel with the current supply to the induction heating coil 1, the indoor control device 60 rotates the cross flow fan 2 that is an indoor fan. At this time, the rotation speed of the cross flow fan 2 is set to the minimum rotation speed set in the indoor unit 101. For example, in the indoor unit 101, there are three patterns of the strong mode, the medium mode, and the weak mode as the rotational speed of the cross flow fan 2, and the rotational speed is set to three stages of high, medium, and low, respectively. So, rotate at the low mode. Here, the rotational speed of the cross flow fan 2 in the weak mode is 120 rpm.

  When an induction current having a high frequency is applied to the induction heating coil 1, an eddy current is generated in the iron crossflow fan 2 located near the induction heating coil 1. Then, Joule heat is generated by the electrical resistance of the cross flow fan 2 and the cross flow fan 2 is heated. The so-called cross flow fan 2 is heated by electromagnetic induction. An eddy current is generated on the surface of the iron cross flow fan 2, and the loss of electric energy is converted into heat energy loss, that is, Joule heat, whereby the cross flow fan 2 is heated by electromagnetic induction.

  Then, while the induction heating coil 1 is energized, the cross flow fan 2 is rotated so that the cross flow fan 2 does not generate heat locally, in other words, the cross flow fan 2 is not locally heated. While rotating the cross flow fan 2, an alternating current is applied to the induction heating coil 1 to electromagnetically heat the cross flow fan 2, whereby only a specific region of the cylindrical cross flow fan 2 is heated, Only there will be a local high temperature. The rotational speed of the cross flow fan 2 at this time is the minimum rotational speed allowed in the indoor unit 100 and the rotational speed set in the weak mode as described above.

  The heat capacity of the cross flow fan 2 is smaller than the heat capacity of the heat exchanger 3, and the temperature can be increased in a short time by electromagnetic induction heating. The indoor unit 101 waits until the heat pump heating by the refrigeration cycle starts up, that is, until the indoor heat exchanger 3 can warm the room air and generate hot air by the refrigerant circulating in the refrigeration cycle. , While rotating the iron crossflow fan 2 with a relatively small heat capacity, heat it by electromagnetic induction to increase its temperature in a short time, transfer the heat to the air passing through the crossflow fan 2, warm the air, The hot air is blown out from the air outlet 5. Therefore, warm air can be blown out from the outlet 5 in a short time after the user instructs the start of the heating operation.

  The experimental data shown in FIG. 6 shows how much the temperature rise is caused by the difference in heat capacity when the cross flow fan 2 and the indoor heat exchanger 3 are heated by electromagnetic induction. FIG. 6 shows blowout from the outlet 5 when the cross flow fan 2 is heated by electromagnetic induction (electromagnetic induction heating while rotating at the minimum rotational speed as described above) and when the indoor heat exchanger 3 is heated by electromagnetic induction. It is a graph which shows the test result which compared the temperature (blowing temperature) raise value of the blown-out wind to be performed. The horizontal axis represents the elapsed time from the start of electromagnetic induction heating, and the vertical axis represents the blowing temperature rise value. The temperature rise value of the blown air is the difference between the temperature of the blown air (blowout temperature) and the room temperature (initial room temperature) at the start of the test, and is the blowout temperature−initial room temperature.

  In addition, since it is a test for the purpose of investigating the influence of the heat capacity of the object to be electromagnetically heated, this test is performed by the indoor unit 101 alone that is not connected to the outdoor unit 102, and a refrigeration cycle is not constructed. . That is, no refrigerant flows into the copper pipe 32 of the indoor heat exchanger 3. Further, the power supplied to the induction heating coil 1 (power consumption of the induction heating coil 1) is the same in both cases, and 1000 W (watts) of power is input here.

  The cross flow fan 2 or the indoor heat exchanger 3 is heated by electromagnetic induction to raise its temperature, so that the air passing through the cross flow fan 2 or the indoor heat exchanger 3 is warmed by heat transfer and the blowing temperature is increased. To rise. It is due to the rotation of the cross flow fan 2 that the air passes through the electromagnetic induction heated cross flow fan 2 or the indoor heat exchanger 3 and is blown out from the outlet 5 as blown air.

  When the cross flow fan 2 is heated by electromagnetic induction, the indoor heat exchanger 3 is not heated by electromagnetic induction, but the induction heating coil 1 is brought close to the indoor heat exchanger 3 and the indoor heat exchanger 3 is heated by electromagnetic induction. The cross flow fan 2 is prevented from being heated by electromagnetic induction. The distance between the indoor heat exchanger 3 and the induction heating coil 1 when the indoor heat exchanger 3 is electromagnetically heated is the distance between the crossflow fan 2 and the induction heating coil 1 when the crossflow fan 2 is electromagnetically heated. Same as distance.

  As shown in FIG. 6, in this test, whether the cross flow fan 2 is electromagnetic induction heated or the indoor heat exchanger 3 is electromagnetic induction heated, the finally reached blowing temperature rise value is approximately It was 23K (Kelvin). The convergence value (asymptotic value) of the blowing temperature is about 23K. In order to compare the rising speed of the blowout temperature, which is the degree of rise in the blowout temperature, here, the blowout temperature rise value is 20.7K (23 × 0.9 = 20.20), which is 90% of its convergence value of 23K. Compare the time to reach 7).

  When the cross flow fan 2 was heated by electromagnetic induction, as shown by the solid line curve in FIG. 6, the elapsed time until the blowing temperature rise value reached 20.7 K was about 60 seconds. On the other hand, when the indoor heat exchanger 3 was heated by electromagnetic induction, the elapsed time was about 140 seconds as shown by the broken curve in FIG. Thus, it can be seen that the rising speed of the blowing temperature is obviously faster when the cross flow fan 2 is heated by electromagnetic induction. In this test, it was about 2.3 times faster.

  As shown in the test results of FIG. 6, the blow-up temperature rises faster when the cross flow fan 2 having a smaller heat capacity than the indoor exchanger 3 is electromagnetically heated. This is because the temperature increase degree of the electromagnetic induction heating object itself is faster when the heat capacity is smaller. Further, the indoor heat exchanger 3 is made of aluminum and copper, and has a lower electrical resistance than the iron cross flow fan 2, so that the effect of induction heating is low. The case where the flow fan 2 is heated by electromagnetic induction is one of the causes that the rising speed of the blow-off temperature is obviously faster.

  Subsequently, this embodiment in which electromagnetic induction heating of the cross flow fan 2 in the indoor unit 101 and normal heat pump heating by operating the refrigeration cycle are combined in a state where the outdoor unit 102 is actually connected and the refrigeration cycle is constructed. A description will be given of an operating state of the first air conditioner 100 (hybrid air conditioner). FIG. 7 is an operation characteristic diagram in which operation data of the air conditioner 100 is graphed.

  As a matter of course, since the high frequency alternating current is passed through the induction heating coil 1 in order to electromagnetically heat the iron cross flow fan 2, the air conditioner 100 consumes electric power for that purpose. And although the compressor 70 which uses motive power (electric power) in a refrigerating cycle increases the rotation speed gradually after starting, the power consumption (input) of the compressor 70 increases with the increase in the rotation speed.

  On the other hand, an increase in the rotational speed of the compressor 70, in other words, an increase in the input of the compressor 70 means an increase in the refrigerant circulation amount of the refrigeration cycle. The number of high-temperature and high-pressure refrigerant flowing through the copper pipe 32 of the indoor heat exchanger 3 increases gradually as the rotational speed of the compressor 70 increases, so that heat is transferred to the copper pipe 32 and further to the fins 31 by the high-temperature refrigerant. As a result, the temperature of the indoor heat exchanger 3 rises. That is, the ability to warm indoor air passing through the indoor heat exchanger 3 increases.

  If the ability to warm indoor air in the indoor heat exchanger 3 increases, it becomes unnecessary to heat the cross-flow fan 2 by electromagnetic induction heating to warm the air passing therethrough. Therefore, in the air conditioner 100, the indoor control device 60 and the outdoor control device 80 cooperate to correspond to the increase in the rotational speed of the compressor 70, in other words, the input (power consumption) of the compressor 70, Control is performed to reduce the electromagnetic induction heating amount of the cross flow fan 2, that is, the power supplied to the induction heating coil 1 (power consumption of the induction heating coil 1).

  In the air conditioner 100, the input (power consumption) of the compressor 70 immediately after the start of the heating operation is low, and the current (power) is positively supplied to the induction heating coil 1 when the air conditioner 100 has sufficient power. Is heated and electromagnetic induction heating is performed while rotating the cross flow fan 2 so that warm air is blown out in a short time from the start of the heating operation.

  In the operating characteristic diagram shown in FIG. 7, the upper graph (a) is an air conditioner that performs only conventional heat pump heating by operating a refrigeration cycle without electromagnetic induction heating, and a hybrid air conditioner. The horizontal axis represents the blowing temperature of the air-conditioning apparatus 100 according to the first embodiment, which combines the electromagnetic induction heating of the iron crossflow fan 2 and the heat pump heating by the refrigeration cycle (the temperature of the blowing air blown from the outlet 5). This is a comparison of elapsed time. Each air conditioner has the same specifications and the same capacity in the configuration of the refrigeration cycle such as the size of the indoor heat exchanger 3.

  The graph shown in (b) in the lower part of FIG. 7 shows the electromagnetic induction heating of the input (power consumption) of the compressor 70 corresponding to the elapsed time from the start of the heating operation of the air conditioning apparatus 100 in (a) and the cross flow fan 2. This shows the input (power consumption) of the induction heating coil 1 to be used and the power consumption of the air conditioning apparatus 100 as a whole. The total power consumption includes the power consumption of the compressor 70 and the power consumption of the induction heating coil 1, the power consumption of the fan motor 45 that rotates the cross flow fan 2, the power consumption of the propeller fan 74 of the outdoor unit 102, The power consumption necessary for control boards installed in the indoor unit 101 and the outdoor unit 102 is included.

  The test (driving) conditions are an environmental test room simulating (assuming) an outdoor detached house, and the outside air temperature is 10 ° C. and the initial room temperature of the room where the indoor unit is installed is 15 ° C. In the air conditioner 100, the maximum input power (allowable maximum power) to the induction heating coil 1 for electromagnetic induction heating of the cross flow fan 2 is 1500 W (watts), and the maximum allowable power consumption of the air conditioner 100 is 2000 W. It was carried out with some restrictions. This is because the target air conditioner has a power capacity of 100 V (volts) -20 A (amperes).

  In addition, when a person stands in front of the air outlet of the indoor unit and the person can determine that the blowing air hitting the person is warm and comfortable, when the blowing temperature rises to 45 ° C, the blowing air is warm. I found out that I felt comfortable. Therefore, the elapsed time until the blowing temperature reaches 45 ° C. is compared between the two.

  The elapsed time in FIGS. 7 (a) and 7 (b) is set to zero when the indoor unit remote control receiver receives an instruction to start the heating operation from the user's remote controller (heating operation start). Show. In FIG. 7 (a), in the conventional (general) heat pump heating-only air conditioner, the temperature of the indoor heat exchanger is about to reach a predetermined temperature at which the rotation of the cross flow fan, which is an indoor fan, starts. It takes 170 seconds, and the elapsed time is about 170 seconds. The cross flow fan starts rotating in the weak mode (120 rpm), and the blowout of the blown air that is the heating conditioned air starts from the blowout port. The blowing temperature reached 45 ° C. when the elapsed time was 205 seconds.

  The conventional air conditioner with only the heat pump heating using the refrigeration cycle used in this test requires about three and a half minutes from the start of the heating operation until the person in front of the indoor unit feels warm and comfortable. It was. FIG. 7A also shows the change in the surface temperature of the indoor heat exchanger of the air conditioner with only heat pump heating. The temperature of the indoor heat exchanger starts to rise from the time when the elapsed time has passed about 40 seconds, but this does not mean that the compressor immediately starts rotating when the remote control receiver receives a heating operation start instruction. This is because some time is required for communication between the indoor control device and the outdoor control device at the start of operation of the air conditioner.

  On the other hand, in the case of the air conditioner 100 which is a hybrid type air conditioner having a configuration for electromagnetically heating the cross flow fan 2 in addition to the normal refrigeration cycle, as shown in FIG. Can be divided into four regions A, B, C, and D. First, the region A is a region where the power consumption of the compressor 70 is zero or small and the induction heating coil 1 can be supplied with the maximum power of 1500 W in order to electromagnetically heat the cross flow fan 2. is there. For this reason, the temperature of the cross flow fan 2 can be increased in a short time by electromagnetic induction heating, and the blowing temperature can reach 45 ° C. at a stretch in about 30 seconds. In addition, when the remote control receiving unit receives the heating operation start instruction, that is, when the heating operation is started, the cross flow fan 2 immediately starts at the rotational speed of the weak mode that is set to the lowest speed in the indoor unit 101. Is to start rotation.

  In the above description, the low power consumption of the compressor 70 means that even when 1500 W, which is the maximum allowable power, is input to the induction heating coil 1, the overall power consumption of the air conditioner 100 is smaller than 2000 W, which is the maximum allowable value. It means that the power consumption. In this way, in this air conditioner 100, the conventional air conditioner only for heat pump heating, which required about 205 seconds from the start of heating operation, the 45 ° C. blowing temperature was greatly reduced to about 30 seconds, That is, it can be secured in a short time. In the area A, the graph showing the power consumption of the compressor 70 as shown in FIG. 7 (b) rises after a certain amount of elapsed time, as in the case of the air conditioner only for heat pump heating, as described above. This is because some time is required for communication between the indoor control device 60 and the outdoor control device 80 when the operation of the air conditioner 100 is started.

  The cross flow fan until the start of the compressor 70 is intentionally delayed and the time for supplying 1500 W, which is the maximum input power, to the induction heating coil 1 is lengthened and the heat pump heating is started up. It is good also as a control structure which aims at the further raise of the blowing temperature by 2 electromagnetic induction heating.

  Further, the rotational speed of the cross flow fan 2 is the rotational speed set in the weak mode from the start of the heating operation until now, but the temperature of the cross flow fan 2 is sufficiently increased by electromagnetic induction heating and the blowing temperature is 45 ° C. After 30 seconds have passed, it may be controlled to switch to the medium mode or the high mode in which the rotational speed is set higher than the weak mode, and to increase the rotational speed of the cross flow fan 2. As a result, the user can feel warmer. That is, when a predetermined time (30 seconds in this case) has elapsed after the start of energization of the induction heating coil 1, control may be performed to increase the rotational speed of the cross flow fan 2.

  The indoor control device 60 cooperates with the outdoor control device 80, and the power consumption is particularly large so that the total power consumption of the air conditioner 100 does not exceed the maximum allowable power consumption of 2000 W (2000 W or less). The power consumption of the compressor 70 whose power consumption varies with the rotational speed is obtained from the outdoor control device 80, the power supply to the induction heating coil 1 is determined based on the power consumption of the compressor 70, and the current supply circuit 13, an alternating current corresponding to the determined supply power (input power) is supplied to the induction heating coil 1.

  In the region B, since the power consumption of the compressor 70 increases as the rotational speed increases, the indoor control device 60 applies power to the induction heating coil 1 so as not to exceed 2000 W, which is the maximum allowable power consumption of the air conditioner 100. The input power is gradually reduced from the maximum 1500 W to correspond to the increase in power consumption of the compressor 70. Therefore, since the electromagnetic induction heating amount of the cross flow fan 2 that has mainly generated hot air until this time decreases, the blowing temperature temporarily decreases. In addition, although the reduction of the electric power supplied to the induction heating coil 1 reduces supply voltage and supply current, the frequency of alternating current is made constant at 26 kHz.

  Thereafter, in region C, the power consumption of the compressor 70 further increases as the rotational speed increases, and the electromagnetic force of the cross flow fan 2 is controlled so as not to exceed 2000 W, which is the maximum allowable power consumption of the air conditioner 100. Power consumption for induction heating must be reduced. However, at this time, the refrigerant circulation amount of the refrigeration cycle by the compressor 70 has already increased and the refrigeration cycle (heat pump cycle) has started to function, and the temperature of the indoor heat exchanger 3 is also in the process of rising. For this reason, the blowing temperature gradually increases while maintaining a temperature of 45 ° C. or higher mainly in the refrigeration cycle, that is, heat pump heating.

  In FIG. 7A, although the temperature change of the indoor heat exchanger 3 of the hybrid air conditioner 100 is not shown, the conventional comparison target shown in FIG. 7A is shown. This is almost the same as the temperature change of the indoor heat exchanger of the air conditioner with only the heat pump heating by the refrigeration cycle. Therefore, the temperature change of the indoor heat exchanger 3 of the air conditioner 100 is not shown in FIG. Yes. This is because both compressor operation patterns are the same, and there is almost no difference if only the refrigeration cycle is seen. Even if the cross flow fan 2 is heated by electromagnetic induction, the refrigeration cycle is not affected.

  Finally, in region D, the refrigeration cycle starts to function in earnest, and the indoor heat exchanger 3 reaches a high temperature, that is, reaches a temperature at which the rotation of the cross flow fan can be started even in an air conditioner only for heat pump heating. The flow fan 2 no longer needs to be heated by electromagnetic induction, and the power consumption of the induction heating coil 1 is converged to 0W. After an elapsed time of 360 seconds, the blowing temperature of both is substantially the same.

  As described above, the air conditioner 100 according to the first embodiment is disposed in the indoor unit 101 so as to be close to the cross flow fan 2 having conductivity, and supplied with a high-frequency alternating current. When the start of heating operation is instructed, the indoor control device 60 rotates the cross flow fan 2 and supplies a high-frequency alternating current to the electromagnetic induction heating coil 1. By conducting electromagnetic induction heating while rotating the cross flow fan 2, heat transfer from the electromagnetic induction heated cross flow fan 2 during the time until the start of heat pump heating by the refrigeration cycle, that is, during the preparation time of the heat pump heating operation Since the air warmed by the air can be blown out as hot air from the outlet 5, the user's instruction to start the heating operation Can be hot air, et al user is satisfied with the warmth to shorten the time to blow out from the air outlet 5. Dissatisfaction that the waiting time from the start of heating operation to hot air blowing out for heat pump heating is eliminated, and warm air blows out in a short time from the instruction to start heating operation, which makes the heating operation comfortable for the user Air conditioning equipment.

  In the air conditioner 100 of the first embodiment, when there is an instruction to start the heating operation, the indoor control device 60 supplies the induction heating coil 1 with the maximum power in the allowable range and the cross flow fan 2. Is heated by electromagnetic induction, the temperature of the cross flow fan 2 can be raised in a short time, and the heat transfer from the cross flow fan 2 can increase the blowing temperature immediately after the start of the heating operation.

  Further, in the air conditioner 100 of the first embodiment, when the compressor 70 of the refrigeration cycle is started by an instruction to start the heating operation, and the power consumption of the compressor 70 increases as the rotation speed increases, the compression of the compressor 70 is increased. Since the power supplied to the induction heating coil 1 is controlled so as to decrease from the maximum value in accordance with the increase in power consumption of the machine 70, the indoor heat exchanger 3 can generate hot air. Regardless, the electromagnetic induction heating of the cross flow fan 2 more than necessary can be avoided, and the generation of power consumption for useless electromagnetic induction heating can be prevented. And the malfunction which the air conditioning apparatus 100 stops by the overcurrent interruption | blocking by excessive power consumption, etc. can be avoided.

  In addition, although the control which reduces the electric power supplied to the induction heating coil 1 corresponding to the increase in the power consumption of the compressor 70 is performed, it corresponds to the increase in the electric current of the compressor 70, or rotation of the compressor 70 Control may be made so that the power supplied to the induction heating coil 1 is reduced in response to an increase in the output frequency of the inverter circuit that is the drive circuit of the compressor 70 indicating the number. In addition, the reduction of the power supplied to the induction heating coil (power consumption of electromagnetic induction heating) may be performed in stages.

  Moreover, the air conditioning apparatus 100 of Embodiment 1 can avoid the local heating of the crossflow fan 2 by performing electromagnetic induction heating while rotating the crossflow fan 2, that is, only a certain part is locally Instead of electromagnetic induction heating, the cross flow fan 2 can be uniformly electromagnetic induction heated in the circumferential direction so that temperature unevenness does not occur in the cross flow fan 2. The heat transfer from the fan 2 becomes uniform in the circumferential direction of the blades 22 so that hot air can be stably generated, and a phenomenon in which a low temperature blown air suddenly gets mixed into the blown air from the blower outlet 5. Can be avoided.

  Further, the air conditioner 100 according to Embodiment 1 constitutes the cross flow fan 2 by performing electromagnetic induction heating while rotating the cross flow fan 2 to avoid local heating of the cross flow fan 2. Since the thermal load (thermal stress) of the blades 22 is alleviated, it is possible to suppress a decrease in life due to thermal fatigue.

  The air conditioner 100 of the first embodiment is set in the indoor unit 101 at least from the start of electromagnetic induction heating to a predetermined time when performing electromagnetic induction heating while rotating the cross flow fan 2. Even if the temperature of the cross flow fan 2 is in the process of rising immediately after the start of electromagnetic induction heating by rotating at the minimum number of rotations (120 rpm in the weak mode here), it has not been fully increased yet. The blowout air with low warmth that is not yet hot enough to be blown out from the blowout port 5 is the wind speed at the minimum rotation speed, so even if the blowout air hits the user directly, The discomfort felt by the user can be reduced.

  The air conditioner 100 according to the first embodiment is located near the back surface of the main body of the indoor unit 101, and the housing 9 constituting the back surface side of the air flow path 51 of the cross flow fan 2 is provided with a storage recess 91, Since the induction heating coil 1 for electromagnetically heating the fan 2 is housed in the housing recess 91 so as not to protrude into the air passage 51, the induction heating coil 1 does not become a ventilation resistance, and the cross flow fan 2 The air blowing efficiency is not reduced.

  Moreover, since the heat insulating material 92 is interposed between the bottom surface of the housing recess 91 and the four inner walls and the induction heating coil 1, it is possible to avoid the occurrence of thermal deformation and thermal fatigue of the resin casing.

  Further, in the air conditioner 100 of the first embodiment, the connecting boss 23 and the rotating shaft 26 interposed between the main body (housing 10) of the indoor unit 101 and the conductive crossflow fan 2 are electrically conductive. Since it is made of an insulating material with minimal electrical conductivity, it is possible to prevent leakage of eddy current and heat generated in the crossflow fan 2 due to electromagnetic heating induction to the indoor unit 101 main body. The electromagnetic induction heating efficiency of the cross flow fan 2 can be increased. Moreover, electric leakage and heat generation of the indoor unit 101 main body can be avoided.

  In the first embodiment, the iron cross flow fan 2 is electromagnetically heated. However, the cross flow fan 2 may be made of another metal having conductivity. For example, there are aluminum, copper, nickel, cobalt, chromium, stainless steel, and the like. These alloys may be used. However, since the effect of electromagnetic induction heating becomes lower as the electric resistance of the metal is smaller, iron or stainless steel having higher electric resistance and versatility than aluminum or copper is preferable.

  Also, a resin cross flow fan manufactured by ultrasonic welding of an injection molded resin part with a plurality of blades standing on an annular flat plate is manufactured, and the resin cross flow fan is manufactured. A metal film may be formed by performing metal plating on the surface, and the crossflow fan 2 having conductivity may be used. The metal to be plated is the above-mentioned conductive material or an alloy thereof. As described above, if the surface of the resin cross flow fan is metal-plated to have conductivity, the manufacture of the conductive cross flow fan 2 capable of electromagnetic induction heating can be facilitated. be able to.

  Moreover, although the installation position (arrangement | positioning location) of the induction heating coil 1 was installed in the back side (wall side) of the indoor unit 101 main body which is the back | inner side from the crossflow fan 2, an installation position is not restricted to this, A place close to the cross flow fan 2, that is, another place as long as the cross flow fan 2 is in the vicinity may be used. For example, the cross flow fan 2 may be installed in the nozzle 12. However, even if it is installed in another place, it is desirable not to project into the air path so as not to be a resistance against the blowing of the cross flow fan 2.

  The air conditioner 100 of the first embodiment is a household one (room air conditioner) and the indoor unit 101 is a wall-hanging type. However, the configuration of the air conditioner is not limited to this, and the once-through fan As long as the air conditioner has an indoor unit that blows air using a cross flow fan, the indoor unit may be of another type such as a ceiling-embedded type or a floor-standing type. Further, the present invention is not limited to home use, and may be applied to a commercial air conditioner or an air conditioner installed in a moving body such as a railway or an elevator.

  The number of turns of the induction heating coil 1 (the number of turns) and the frequency of the alternating current supplied to the induction heating coil 1 are the wire diameter of the induction heating coil 1, the magnitude (material) of the electric resistance of the cross flow fan 2, and the cross It is appropriately determined depending on the distance between the flow fan 2 and the induction heating coil 1 and the extent to which the temperature of the cross flow fan 2 is increased.

Embodiment 2. FIG.
In the first embodiment, at the same time as the start of energization to the induction heating coil 1 at the start of the heating operation, the electric conduction is performed at the weak mode rotation speed 120 rpm which is the minimum rotation speed set in the indoor unit 101. The rotating cross flow fan 2 was rotated, and the rotating cross flow fan 2 was heated by electromagnetic induction. For this reason, the temperature of the cross flow fan 2 is in the process of rising immediately after the start of energization of the induction heating coil 1, and the temperature of the cross flow fan 2 has not increased until the user can generate satisfactory hot air. However, since the blowout air blown out from the air outlet 5 becomes a weak mode wind speed, even if the wind directly hits the user, the user's discomfort is reduced.

  However, it is desirable to avoid, as much as possible, a situation in which a user requesting a heating operation directly has a wind that has not risen to a temperature at which the user can be satisfied, although it is reduced. Therefore, in the second embodiment, it is possible to blow out warm air from the outlet 5 that the user is satisfied with warmth in a short time from the start instruction of the heating operation of the user and use from the start of the heating operation. Provided is an air conditioner in which a blowing air does not hit a user until a warm air that satisfies the warmth can be generated.

  The configuration of the air-conditioning apparatus 200 shown in the second embodiment is the same as that of the air-conditioning apparatus 100 of the first embodiment. Here, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. The air conditioner 200 according to the second embodiment is different from the air conditioner 100 according to the first embodiment in the operation control of the indoor unit including the rotation control of the cross flow fan 2 in the time until the heat pump heating is started. The rest is the same as in the first embodiment. For the sake of convenience, the air conditioner of the second embodiment is referred to as the air conditioner 200 and the indoor unit is referred to as the indoor unit 201, but as described above, the air conditioner 100 of the first embodiment, The machine 101 has the same configuration and is different only in operation control, and the same reference numerals are used except for two.

  Thus, the operation of the air conditioner 200 according to Embodiment 2 will be described mainly with respect to the indoor unit 201. FIG. 8 is a graph showing the generated pressure with respect to the rotational speed when the cross flow fan 2 is rotated. Here, the generated pressure indicates an increase in the air pressure on the downstream side (downwind side) with respect to the air pressure on the upstream side (windward side) of the crossflow fan 2, and passes through the crossflow fan 2. It shows how much pressure has increased.

  A curve indicated by a solid line with a sign of Q indicates a generated pressure characteristic when the rotational speed of the cross flow fan 2 is gradually decreased from a high rotational speed, and is indicated by a broken line with a sign of R. The curve shows the generated pressure characteristic when the rotational speed of the cross flow fan 2 is gradually increased from a low rotational speed, contrary to the curve Q. The curve R coincides with the curve Q in the region G.

  The curve Q is generally a power curve in many cases. The change in the generated pressure with respect to the rotational speed of the cross flow fan 2 has a hysteresis characteristic. As shown in FIG. 8, the curve Q and the curve R are in a rotational speed range lower than a specific rotational speed. Shows different curves and shows different generated pressures even at the same rotational speed. With respect to the curve Q and the curve R showing the change in the generated pressure with respect to the rotation speed of the cross flow fan 2, the rotation speed range can be classified into regions E, F, and G from the respective characteristics.

  In FIG. 8, in the area E, as indicated by the curve Q, when the rotational speed of the cross flow fan 2 has decreased from a rotational speed higher than the rotational speed of the area E, the generated pressure is 0 except for the stopped state. Since the pressure on the downstream side is higher than that on the upstream side, it means that the air blowing action from the upstream side to the downstream side is performed. Originally, an air flow (air blowing) from the inlet 4 to the outlet 5 exists (is formed), and since the rotational speed is reduced from that state, the direction of the flow is maintained, and the rotation is extremely slow. Even if it becomes, only the wind speed falls, and the air blowing action is not lost.

  On the other hand, as indicated by the curve R, when the rotational speed of the cross flow fan 2 increases from the stop, the generated pressure becomes 0 in the region E. That is, it indicates that the air blowing action is not performed. This is because, even if the crossflow fan 2 is rotated at an extremely low speed without air flow (air blowing), vortexes are generated in the crossflow fan 2, and the energy of the air blow is consumed due to the pressure loss of the vortex. Because it will be done. In the region E of the curve R, although the cross flow fan 2 is rotating, the air flow from the upstream side to the downstream side is not generated, that is, the air is not blown. In the cross flow fan 2, the maximum rotation speed in the region E (the rotation speed at the boundary between the region E and the region F) was 35 rpm. In the case of the curve Q, in the region E, the flow is maintained only by the decrease in the wind speed, so that the vortex is not generated and the blowing energy is not consumed by the vortex.

  In the region F, the generated pressure differs depending on whether the rotational speed of the cross flow fan 2 increases (curve R) or decreases (curve Q), which means that the air flow rate is different. Yes. When the rotational speed of the cross flow fan 2 that is the curve Q has decreased, the amount of blown air is larger. In the region G, the air flow rate with respect to the rotational speed of the cross flow fan 2 always matches. In the cross flow fan 2, the rotational speed at the boundary between the region F and the region G is 100 to 110 rpm, and therefore the set rotational speed in the weak mode is 120 rpm.

  As shown in the region E in the curve Q of FIG. 8, although the cross flow fan 2 is rotating, no air flow is generated on the upstream side and the downstream side of the cross flow fan 2, that is, no air is blown. Here, the rotational speed range of the state is referred to as no air blowing rotation. In addition, the wind speed of the blowing air during the non-air-blowing rotation was about the same as the fluctuation in the atmosphere (0.1 m / s or less).

  Therefore, in the air conditioner 200 according to the second embodiment, the indoor control device 60 starts the heating operation (the remote control receiving unit 14 receives an instruction to start the heating operation) and then performs cross flow fan by electromagnetic induction heating. Until the temperature of 2 rises to such an extent that hot air can be generated, the cross flow fan 2 is heated by electromagnetic induction while rotating at such a low rotational speed without air blowing, that is, without air blowing. Then, after the temperature of the cross flow fan 2 rises to such an extent that hot air can be generated, the rotational speed of the cross flow fan 2 is shifted to a weak mode or a higher rotational speed than the weak mode, that is, a rotational speed with a blowing action ( And control to continue the electromagnetic induction heating.

  That is, in this air conditioner 200, when performing electromagnetic induction heating while rotating the crossflow fan 2 during the preparation time of the heat pump heating operation by the refrigeration cycle, the indoor control device 60 sets the rotation speed of the crossflow fan 2 to the heating rate. A predetermined time from the start of operation (start of electromagnetic induction heating) is set to an ultra-low speed that does not involve a blowing action, and control is performed to increase the number of revolutions that involve a blowing action after a predetermined time has elapsed. Although the room air is sucked from the suction port 4 as the rotational speed increases, the temperature of the cross flow fan 2 has already risen to the point where it can generate hot air at a temperature that satisfies the user. The newly sucked air is transferred from the cross-flow fan 2 so that warm air at a temperature satisfactory to the user is continuously blown out from the outlet 5 at least until the heat pump heating by the refrigeration cycle is started. Become.

  For this reason, it is possible to reliably avoid blowing air to the user from the start of the heating operation until the user can generate warm air that satisfies the warmth by the heat transfer of the cross flow fan 2. Further, although the air blowing action is not performed, the cross flow fan 2 is rotating although it is an ultra-low speed rotation, so it is not heated locally, and the cross flow fan 2 is evenly distributed in the circumferential direction. It is possible to prevent uneven temperature from occurring in the cross flow fan 2 by electromagnetic induction heating.

  In this air conditioner 200, after the cross flow fan 2 is increased from the non-air blowing rotation to the rotation speed with the air blowing action, the indoor control device 60 performs the same control as the air conditioner 100 of the first embodiment. I do. That is, when the power consumption of the compressor 70 increases as the rotational speed of the compressor 70 increases, the power supplied to the induction heating coil 1 is reduced in accordance with the increase of the power consumption of the compressor 70, and the cross Control is performed to reduce the amount of electromagnetic induction heating of the flow fan 2.

  In this case, the induction heating coil 1 is energized with an alternating current while the cross flow fan 2 is rotated in such a non-blowing rotation so as to perform electromagnetic induction heating. In the preheating of the cross flow fan 2, since there is no air flow, most of the amount of heat given by the induction heating coil 1 is used for increasing the temperature of the cross flow fan 2. In the case of electromagnetic induction heating while rotating at a low mode rotation speed (120 rpm), there is an air flow, and the passing air takes heat away, so compared with the air conditioner 100 of the first embodiment, at the same supply power In the air conditioner 200, the temperature increase rate of the cross flow fan 2 becomes faster.

  FIG. 9 is a graph showing changes in the surface temperature of the cross flow fan 2 when the cross flow fan 2 is preheated and the temperature of the blown air from the outlet 5 (outlet temperature), with the elapsed time on the horizontal axis. Testing with different preheating times. In this test, the refrigeration cycle is not operated, the refrigerant does not flow into the indoor heat exchanger 3, and the indoor heat exchanger 3 does not warm the passing air. The indoor unit 201 is operated alone, and the rise (change) in the blowing temperature is due to heat transfer from the cross flow fan 2 heated by electromagnetic induction.

  As test conditions, the input power to the induction heating coil 1 is 1500 W, which is the maximum allowable power, and the preheating time is four patterns of 0 seconds (no preheating), 5 seconds, 10 seconds, and 15 seconds, respectively. Simultaneously with the end of the preheating time, the rotational speed of the cross flow fan 2 is increased from the non-air blowing rotation to the weak mode rotation speed. The rotational speed of the non-blast rotation is about 30 rpm, and the rotational speed of the weak mode is 120 rpm. A fan motor capable of setting a rotation speed of about 30 rpm was used. The pattern without preheating is the same as the operation pattern of the air conditioning apparatus 100 in the first embodiment.

  In FIG. 9, the upper stage (a) shows the change in the surface temperature of the cross flow fan 2, and the lower stage (b) shows the change in the blowing temperature. The surface temperature of the cross flow fan 2 was measured using a radiation thermometer capable of non-contact measurement from the air outlet 5. Both FIGS. 9A and 9B show the temperature change (K: Kelvin) from the room temperature (initial room temperature) at the start of the test. At the start of the test, the initial room temperature and the surface temperature of the cross flow fan 2 are equal. Simultaneously with the start of the test (at an elapsed time of 0), the cross flow fan 2 is rotated without air blowing, and the induction heating coil 1 is energized with an alternating current of 26 kHz with a power of 1500 W. However, in the pattern without preheating, the cross flow fan 2 is rotated in the weak mode simultaneously with the start of the test.

  In any preheating time, as shown in FIG. 9B, the convergence value (asymptotic value) of the blowing temperature change is 34K. The elapsed time until the blowout temperature change (rise) reaches 34K, which is the convergence value, is about 30 seconds when the cross flow fan 2 is not preheated and when the preheat time is 5 seconds, and when the preheat time is 10 seconds. Was about 12 seconds and the preheating time was about 15 seconds. In the preheating time of 10 seconds and 15 seconds, the temperature reaches about 2 seconds after the end of the preheating. When the preheating time is as short as 5 seconds, the time required to reach the convergence value of 34K is almost the same as that without preheating (0 seconds of preheating), and cannot contribute to shortening the rise time of the blowing temperature. I understood.

  On the other hand, when the preheating time was 15 seconds, the blowing temperature greatly exceeded 34K from the elapsed time of 17 seconds to 27 seconds. This is because the cross flow fan 2 is heated more than necessary as shown in FIG. In the case of the preheating time of 10 seconds, the reached value when the blowing temperature rises substantially vertically (when the elapsed time is 12 seconds) is just a convergence value of 34 K, and the electromagnetic induction heating of the cross flow fan 2 It was found that it was the most suitable preheating time without waste.

  At this time (when the elapsed time is 12 seconds), the temperature rise value of the cross flow fan 2 is about 95K. Since the convergence value (asymptotic value) of the temperature change of the cross flow fan 2 is 73K, it is heated to 1.3 times the convergence value 73K. In the case of the preheating time of 10 seconds, the temperature change of the cross flow fan 2 rises to 95K and then converges to 73K. After the preheating time of 10 seconds, the rotational speed of the cross flow fan 2 is This is because heat is transferred to the air flowing from the cross flow fan 2 by increasing the number of rotations in the weak mode that causes the air flow, that is, causing the air flow. And it stabilizes to 73K because the thermal system is stabilized.

  When the rotational speed of the cross flow fan 2 increases from the no-air rotation to the weak mode, an air flow is generated and blown out from the outlet 5 as a blown air. Since there was no flow, cold air that has not been warmed exists in the air path from the cross flow fan 2 to the air outlet 5. For this reason, the blown air that is blown up first after increasing to the low mode rotation speed is a mixture of heat-transferred air and cold air existing in the air passage. . The temperature of the blowing air becomes lower than the temperature of the air immediately after the heat transfer.

  Therefore, in order to satisfy the user that the first blown air blown out from the outlet 5 is sufficiently warm, the cross flow fan 2 is preheated strongly, that is, higher than the convergence value 73K. Even if the heat transferred to the temperature rises and the heat transferred air is mixed with the above cold air and the temperature drops, the temperature of the mixed air should be at a level that the user can be satisfied with being sufficiently warm. It's fine. By heating the cross flow fan 2 to 95K, which is higher than the convergence value, the blowout temperature (temperature change value) can be set to 34K, which is the convergence value of the blowout temperature change from the beginning of the blowout.

  The cross-flow fan 2 is heated in advance so that the temperature rises higher than the temperature of the convergence value when the thermal system is stabilized, so that when the blown air is blown out for the first time, it exists in the air path. It is possible to compensate for the temperature drop of the blown air due to the mixing with the cold air, and to blow out the warm air that the user can satisfy from the beginning. As shown in the preheating time of 10 seconds in FIG. 9B, the vertical rise of the blowing temperature and the rise value of the rising blowing temperature can be brought close to the convergence value of the blowing temperature change.

  When the pre-heating time of the cross flow fan 2 was changed finely and the rotation temperature of the cross flow fan 2 increased from the non-blast rotation to the weak mode rotation, the blowing temperature at the beginning of blowing was evaluated. If the cross flow fan 2 is heated by electromagnetic induction until the temperature rises approximately 1.1 times to 1.5 times as high as the asymptotic value of the temperature change (here 73 K), the comfort for the user is good. In other words, it was found that the blowing air at the beginning of the blowing was satisfactory if it was sufficiently warm. Specifically, if the temperature rise convergence value of the crossflow fan 2 is 73K, electromagnetic induction heating may be performed so that the temperature of the crossflow fan 2 increases from 80K to 110K.

  By the way, the non-fan rotation requires an ultra-low speed that is lower than the speed set in the weak mode. As in the test of FIG. 9, a rotation speed of about 30 rpm can be set, and a fan motor capable of realizing a stable rotation at the rotation speed may be used. By using such a fan motor, It is conceivable that the cost of the air conditioner 200 increases or that the motor efficiency decreases at a high rotational speed set in the strong mode.

  Therefore, in the air conditioner 200 of the second embodiment, the same low speed rotation of the cross flow fan 2 as 35 rpm or less (substantially 25 to 35 rpm) is performed by the same fan motor 45 as the air conditioner 100 of the first embodiment. That is, the indoor control device 60 performs control capable of realizing no air blowing rotation. The control method will be described below.

  FIG. 10 is a characteristic diagram showing an operation control method of the fan motor 45 for realizing the non-blast rotation of the cross flow fan 2 by the fan motor 45. The indoor control device 60 of the air conditioner 200 is provided for a drive circuit of a fan motor 45 that rotates the cross flow fan 2 (not shown, but mounted on a substrate on which the indoor control device 60 is installed). Thus, the application of the DC voltage to the fan motor 45 is controlled ON-OFF. In accordance with an instruction from the indoor control device 60, the drive circuit of the fan motor 45 performs a switching operation that repeats ON-OFF.

  The DC voltage applied to the fan motor 45 is a voltage set when the cross flow fan 2 is rotated in the weak mode. That is, the minimum voltage of the fan motor 45 set in the indoor unit 201. In other words, it is the voltage at the minimum rotation speed of the cross flow fan 2 set in the indoor unit 201. As shown in FIG. 10, after the indoor control device 60 applies this voltage (after ON), it increases the number of rotations set in the weak mode, that is, during the increase of the number of rotations. It is released (OFF). The rotational speed of the fan motor 45 at this time is the rotational speed indicated by max in FIG. 10, which is 35 rpm here.

  Even if the voltage application is turned off, the fan motor 45 and the cross flow fan 2 have an inertial force. Therefore, the fan motor 45 does not stop immediately but continues to rotate while receiving a frictional resistance and reducing the rotational speed. And when it falls to a moderate rotation speed, a voltage is applied again (ON) and a rotation speed is raised. This moderate rotational speed is the rotational speed indicated by min in FIG. 10, which is 25 rpm here. When the number of revolutions that have risen as voltage ON again increases to the maximum number of revolutions that are increasing, the voltage application is released (OFF) again. Thereafter, during the non-air-blowing rotation, that is, during the preheating of the cross flow fan 2, such voltage application to the fan motor 45 is repeatedly turned on and off. By repeating ON / OFF of voltage application to the fan motor 45, the rotational speed of the crossflow fan 2 is increased or decreased between the rotational speed indicated by max and the rotational speed indicated by min. , Max and the rotational speed indicated by min are both the rotational speeds within the range of region E in FIG.

  By repeating the ON / OFF of the voltage application of the fan motor 45 by switching operation, a pseudo ultra-low speed rotation can be achieved. Apparently, it rotates at the average number of rotations of max and min. In the case of FIG. 10, the rotation at 30 rpm is realized in a pseudo manner. Even if the fan motor 45 is not changed to an expensive motor capable of stable and ultra-low-speed rotation, voltage application to the fan motor 45 is controlled on and off to set the minimum rotation speed. Therefore, it is possible to realize rotation at a very low rotation speed that is lower than the rotation speed and that does not rotate by blowing air.

  The shorter the ON / OFF control interval of voltage application to the fan motor 45, that is, the finer the switching operation of the drive circuit of the fan motor 45, the smaller the difference between the max rotation speed and the min rotation speed shown in FIG. The number of rotations of the cross flow fan 2 during non-air rotation (preheating) becomes more stable.

  In actual control, the ON-OFF timing is not measured based on the rotational speed of the fan motor 45 or the cross flow fan 2 but is controlled by time. The ON time and the OFF time are determined, respectively, and the application of voltage to the fan motor 45 is controlled based on these times. In FIG. 10, the ON time at the start of rotation is 2 seconds, and thereafter, the OFF time is controlled to repeat 2 seconds and the ON time is repeated 0.5 seconds. For the ON time and OFF time, an optimum value corresponding to the specifications of the fan motor 45 and the pseudo ultra-low speed to be realized may be determined in advance from the test results and programmed into the indoor control device 60.

  In the air conditioner 200, the preheating time of the cross flow fan 2 (the time for electromagnetic induction heating while rotating the cross flow fan 2 with no air blowing rotation) is controlled by the indoor control device 60. At this time, the indoor control device 60 performs control so as to increase from the non-air-blowing rotation to the rotation speed at which air can be blown (here, the rotation speed in the weak mode) after preheating for a preset time programmed. And this setting time shall change in steps or continuously according to the temperature of the room in which the indoor unit 201 which a room temperature sensor measures is installed.

  That is, the indoor control device 60 performs control so that the preheating time becomes longer as the room temperature or the suction temperature is lower. By changing the length of the preheating time of the cross flow fan 2 according to the room temperature or the intake air temperature, it is possible to avoid insufficient preheating or excessive preheating of the cross flow fan 2, so that the user cannot satisfy the warmth. It is possible to avoid a problem that the wind is blown out from the outlet 5 or energy for electromagnetic induction heating is wasted.

  As described above, the air conditioner 200 of the second embodiment performs electromagnetic induction heating of the crossflow fan 2 having conductivity during the time from the start of the heating operation to the rise of the heat pump heating, that is, during the preparation time of the heat pump heating operation. Furthermore, from the start of the heating operation until the temperature of the cross flow fan 2 rises to a level at which hot air can be generated by electromagnetic induction heating, electromagnetic induction heating is performed while rotating with no air blowing, and the temperature of the cross flow fan 2 is kept warm. After reaching a level where wind can be generated, it is not at a level where the user can be satisfied with the warmth by increasing the number of rotations with air blowing action, that is, by increasing the number of revolutions causing air flow to continue electromagnetic induction heating. The blowout air is not blown out from the blowout port 5, and it is reliably avoided that the blowout air hits the user. Door can be.

  And even if it is rotation by the ultra-low-speed rotation called non-blast rotation, since the crossflow fan 2 is rotating, the crossflow fan 2 is not heated locally, The electromagnetic induction heating can be performed uniformly in the circumferential direction so that the temperature unevenness in the cross flow fan 2 does not occur.

  Furthermore, in the electromagnetic induction heating (preheating) in the non-blowing rotation of the cross flow fan 2, since no air flow occurs, most of the applied heat is spent on the temperature rise of the cross flow fan 2. The temperature rise (rising temperature) of the cross flow fan 2 becomes faster. Thereby, compared with the air conditioning apparatus 100 of Embodiment 1, it is possible to further shorten the time from the start of the heating operation until the warm air sufficiently satisfying the user's warmth is blown out from the air outlet 5. it can.

  In addition, the air conditioner 200 of the second embodiment preheats the cross flow fan 2 until the temperature of the cross flow fan 2 rises to a temperature higher than the converged value (asymptotic value) after stabilization of the thermal system. Since the temperature of the cross flow fan 2 is controlled to be increased to the number of rotations accompanied by the air flow after the temperature is increased, the temperature at which the blowout from the blowout port 5 starts can be increased. The user can feel the warm air sufficiently satisfying the warmth from the first blown air, and can increase the comfort of the heating operation for the user.

  Further, in the air conditioner 200 of the second embodiment, the temperature of the cross flow fan 2 rises to a temperature that is 1.1 to 1.5 times higher than the convergence value (asymptotic value) after stabilization of the thermal system. The cross flow fan 2 is preheated until the temperature rises, and after the temperature is increased, the rotation speed of the cross flow fan 2 is controlled to be increased to the rotation speed accompanied by air blowing. The blowout temperature can be increased, and it is possible to prevent problems that it takes time for the blowout temperature to increase due to insufficient heating or the blowout temperature rises more than necessary due to excessive heating. Can be improved, and unnecessary electromagnetic induction heating can be avoided to avoid unnecessary energy consumption.

  Further, the air conditioner 200 of the second embodiment controls the application of a DC voltage to the fan motor 45 to be turned on and off in a short time (repeat application and release of application), that is, voltage application to the fan motor 45. And the application of voltage cancellation in the middle of the increase of the rotation speed of the cross flow fan 2 (before the rotation speed increases to the minimum rotation speed set at the minimum voltage), A cross flow fan having an ultra-low speed such as about 30 rpm by increasing or decreasing the speed of the cross flow fan 2 by a predetermined width in a lower speed range than the set minimum speed. Since the fanless rotation of 2 can be realized in a pseudo manner, an expensive motor capable of rotating at a very low speed is used for the fan motor 45, or the motor efficiency is lowered in a high rotation range. Without, (to electromagnetic induction heating while being rotated without blowing rotation) of preheating the cross flow fan 2 is made possible.

  Further, in the air conditioner 200 of the second embodiment, the indoor control device 60 changes the length of the preheating time of the cross flow fan 2 according to the temperature of the room in which the indoor unit 201 is installed. Insufficient preheating and vice versa, it is possible to avoid the problem of preheating longer than necessary, so that blowout air that the user is not satisfied with warmth is blown out from the outlet 5 or for electromagnetic induction heating. It is possible to avoid a situation where energy is consumed wastefully.

Embodiment 3 FIG.
In the third embodiment, for the same purpose as in the second embodiment, it is possible to blow out warm air from the outlet 5 in a short time from the user's instruction to start the heating operation. In addition, the present invention provides an air conditioner in which the user does not receive blown air from the start of the heating operation until the user can generate warm air that satisfies the warmth. The operation control is different from that of the second embodiment.

  The configuration of the air-conditioning apparatus 300 shown in the third embodiment is the same as that of the air-conditioning apparatus 100 of the first embodiment. Here, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. The air conditioner 300 according to the third embodiment is different from the air conditioner 100 according to the first embodiment in the operation control of the indoor unit during the heat pump heating operation preparation time, and is otherwise similar to the first embodiment. It is. For the sake of convenience, the air conditioner of the third embodiment is referred to as the air conditioner 300 and the indoor unit is referred to as the indoor unit 301, but as described above, as described above, the air conditioner 100 of the first embodiment, The machine 101 has the same configuration and is different only in operation control, and the same reference numerals are used except for two.

  Thus, the operation of the air conditioner 300 according to Embodiment 3 will be described mainly with respect to the indoor unit 301. FIG. 11 is a longitudinal sectional view of the indoor unit 301 of the air conditioner 300. As shown in FIG. 11, in this indoor unit 301, when electromagnetic induction heating is performed while the cross flow fan 2 is rotated, the up-and-down air direction control plate 7 is closed from the start of electromagnetic induction heating to a predetermined time, that is, the air outlet. 5 is performed in a state where 5 is closed.

  When remote control receiver 14 receives an instruction to start the heating operation from the user, indoor control device 60, like indoor unit 101 of the first embodiment, has a rotational speed at which cross flow fan 2 is set to the weak mode. The high-frequency alternating current is supplied to the induction heating coil 1 while rotating the motor to start the electromagnetic induction heating of the cross flow fan 2. However, at this time, the vertical air direction control plate 7 is not rotated (not opened), and the closed state when the air conditioner 300 is in the stopped state is maintained. For this reason, the air outlet 5 remains closed, and a substantially closed space H surrounded by the indoor heat exchanger 3 and the vertical airflow direction control plate 7 is shown in FIG. Is formed.

  Here, the rotational speed of the cross flow fan 2 is not limited to the rotational speed set to the weak mode, and is not the airless rotation shown by the indoor unit 201 of the second embodiment, but the vertical wind direction control plate 7. If it is in the state which is open, what is necessary is just the rotation speed accompanying the ventilation effect | action which blows off blowing air from the blower outlet 5.

  The cross flow fan 2 that is heated by electromagnetic induction performs a blowing action if the up-and-down air direction control plate 7 is open, but at this stage, the blowing outlet 5 is closed and there is no place to blow out, so the blowing action cannot be performed. The air present in H is stirred by the cross flow fan 2 that is heated by electromagnetic induction while rotating, and the temperature rises due to heat transfer from the cross flow fan 2.

  When the temperature of the air in the space H rises to a temperature at which the user can sufficiently satisfy the warmth, the indoor control device 60 opens the up-and-down air direction control 7, that is, rotates it to close the outlet 5. Is released and opened. The state in which the up-and-down air direction control plate 7 is opened is as shown in FIG. By opening the air outlet 5 at the same time that the vertical air direction control plate 7 is opened, the air blowing action of the cross flow fan 2 rotating at the weak mode rotation speed becomes possible, and the air blown out from the air outlet 5. become.

  At this time, the air that has been stirred and sufficiently warmed in the space H is blown out first. Since the temperature of the cross flow fan 2 has already been sufficiently increased by electromagnetic induction heating at this time, the air newly sucked from the suction port 4 is also transferred from the cross flow fan 2 to satisfy the user. The hot air at the temperature is continuously blown out from the outlet 5 at least until the heat pump heating by the refrigeration cycle is started.

  That is, in this air conditioner 300, when performing electromagnetic induction heating while rotating the crossflow fan 2 during the preparation time of the heat pump heating operation by the refrigeration cycle, the indoor control device 60 starts the heating operation (start of electromagnetic induction heating). After the predetermined time, the air outlet 5 is closed by the up-and-down air direction control plate 7, and after the elapse of a predetermined time, the up-and-down air direction control plate 7 is rotated to control the opening of the air outlet 5.

  In this way, from the start of the heating operation until the warm air satisfying the user's warmth can be generated by the electromagnetic induction heated cross flow fan 2, the air outlet 5 is blocked by the vertical air direction control plate 7, Even if the cross flow fan 2 is heated by electromagnetic induction while rotating the cross flow fan 2 at a rotational speed with a blowing action if the blowout port 5 is open, the blowout air does not hit the user. And since the warm air which a user can satisfy warmth blows out simultaneously with the opening of the blower outlet 5, the user does not have the blown air which has not risen to the temperature which a user satisfies.

  Further, by performing electromagnetic induction heating while rotating the cross-flow fan 2 with the blower outlet 5 closed by the up-and-down air direction control plate 7, no air flow is generated even at the rotation speed capable of blowing air. Most of the amount of heat is spent on the temperature rise of the cross flow fan 2 and is transferred to the air in the space H, so that the temperature rise (rise of temperature) of the cross flow fan 2 is accelerated. Thereby, it is possible to further shorten the time from the start of the heating operation to the time when the warm air that can be sufficiently satisfied by the user is blown out from the outlet 5 as compared with the air conditioner 100 of the first embodiment. it can.

  In this air conditioner 300, after the up-and-down air direction control plate 7 is rotated and the air outlet 5 is opened, the indoor control device 60 performs the same control as the air conditioner 100 of the first embodiment. That is, when the power consumption of the compressor 70 increases as the rotational speed of the compressor 70 increases, the power supplied to the induction heating coil 1 is decreased in correspondence with the increase in power consumption of the compressor 70, Control is performed to reduce the electromagnetic induction heating amount of the cross flow fan 2.

  Moreover, in this air conditioning apparatus 300, the timing (time to opening) which opens the blower outlet 5 by rotating the up-and-down air direction control board 7 after heating operation start is controlled by the indoor control apparatus 60. At this time, the indoor control device 60 determines the temperature of the indoor heat exchanger 3 measured by the temperature sensor, the temperature of another part having a surface facing the space H, or the space H measured directly by the temperature sensor. When the temperature of the air present in the air rises to a preset temperature programmed in advance, the vertical air direction control plate 7 is rotated to open the air outlet 5. This set temperature is a temperature at which the temperature of the air present in the space H is sufficiently satisfied by the user for warmth.

  Therefore, the air outlet 5 does not open and blown out as a blowing air before the air in the space H has risen to a temperature at which the user is satisfied with the warmth. Does not hit the user. Furthermore, it takes no longer time than necessary to open the air outlet 5, and it is possible to avoid problems such as wasteful consumption of energy for electromagnetic induction heating.

  Also, as a control method different from this control method, the indoor control device 60 performs control by rotating the up / down air direction control plate 7 to open the air outlet 5 after a preset time has been programmed. May be. Then, the set time may be changed stepwise or continuously in accordance with the temperature of the room in which the indoor unit 301 installed by the room temperature sensor is measured. By changing the time from the start of the heating operation to the opening of the outlet 5 according to the room temperature or the intake air temperature, a blowing air that the user is not satisfied with the warmth is blown out from the outlet 5, or electromagnetic induction heating Therefore, it is possible to avoid problems such as wasteful consumption of energy.

  As described above, the air conditioner 300 according to the third embodiment performs electromagnetic induction while rotating the cross flow fan 2 having conductivity during the time from the start of the heating operation to the rise of the heat pump heating, that is, the preparation time of the heat pump heating operation. When heating, the air temperature in the space H surrounded by the indoor heat exchanger 3 and the up-and-down air direction control plate 7 rises to a predetermined temperature at which the user can satisfy the warmth from the start of the heating operation. Up and down, the vertical wind direction control plate 7 is closed, that is, the air outlet 5 is closed, and if the air temperature in the space H rises to the predetermined temperature, the vertical wind direction control plate 7 is rotated. By controlling the air outlet 5 to open, the user can blow out warm air that satisfies the warmth at the same time that the air outlet 5 is opened. Balloon style that does not rise until it is possible to reliably avoid that corresponds to the user.

  And the air between the cross flow fan 2 contained in the space H and the up-and-down air direction control board 7 can be stirred and heated until the blower outlet 5 is opened, whereby the air conditioning apparatus of the second embodiment. As shown in FIG. 200, the cross flow fan 2 does not need to be heated strongly in advance so that the temperature of the cross flow fan 2 becomes higher than the convergence value when the thermal system is stabilized. Since the induction heating time can be omitted, it is possible to further reduce the time required for blowing out the warm air that the user is sufficiently satisfied with the warmth, and the comfort for the user can be improved. Moreover, it is not necessary to consume energy for stronger heating, which contributes to energy saving.

  Furthermore, since air flow does not occur by performing electromagnetic induction heating while rotating the cross flow fan 2 with the blower outlet 5 closed by the up-and-down air direction control plate 7, most of the applied heat is cross-flow. Since the temperature of the fan 2 is increased and heat is transferred to the air in the space H, the temperature increase (rising temperature) of the cross flow fan 2 is accelerated, and the user is warm from the start of the heating operation. It is possible to further shorten the time until the warm air sufficiently satisfying the above is blown out from the air outlet 5.

  Further, in the air conditioner 300 according to the third embodiment, the indoor control device 60 measures the temperature of the indoor heat exchanger 3 measured by the temperature sensor, the temperature of another component having a surface facing the space H, or directly. When the temperature of the air existing in the space H measured by the temperature sensor rises to a preset temperature set in advance, the vertical air direction control 7 is rotated to open the air outlet 5. Thus, it is possible to avoid a problem that a blowing air that the user is not satisfied with warmth is blown out from the outlet 5 or that energy for electromagnetic induction heating is wasted.

  In the air conditioner 300 according to the third embodiment, the indoor control device 60 performs control such that the up-and-down air direction control 7 is rotated to open the air outlet 5 when a preset programmed time has elapsed. Alternatively, by changing the set time stepwise or continuously according to the temperature of the room where the indoor unit 301 measured by the room temperature sensor is measured, there is a blowing air that the user cannot satisfy with the warmth. It is possible to avoid problems such as being blown out from the outlet 5 or wastefully consuming energy for electromagnetic induction heating.

Embodiment 4 FIG.
Up to this point, the electromagnetic induction heating of the conductive cross flow fan 2 is blown out in a short time from the start of the heating operation, before the heat pump heating by the refrigeration cycle starts up, and the user satisfies the warmth. I have been using it. Hereinafter, an application example in which electromagnetic induction heating of the crossflow fan 2 having conductivity is developed at a time other than when the heating operation is started will be described. First, as Embodiment 4, a mode that is used during the defrosting operation (defrosting operation) of the outdoor heat exchanger 72 performed during the heat pump heating operation by the refrigeration cycle will be described.

  Here, the defrosting operation will be described. When the heat pump heating operation by the refrigeration cycle is continued and the evaporation temperature of the refrigerant becomes 0 ° C. or less, the moisture present in the outside air solidifies and adheres as frost on the surface of the outdoor heat exchanger 72 functioning as an evaporator. To do. When the attached frost grows and grows, the flow resistance of the outdoor heat exchanger 72 increases, and the efficiency of heat exchange with the outside air is significantly reduced. Therefore, a defrosting operation is performed to remove frost attached to the outdoor heat exchanger 72. Normally, the four-way valve 71 is switched to reverse the refrigerant flow in the refrigeration cycle, and the heating operation cycle is switched to the refrigeration cycle during the cooling operation. Thereby, the outdoor heat exchanger 72 is caused to function as a condenser, and the frost attached by the condensation heat of the refrigerant is melted and led out of the outdoor unit 101 as drain water. Generally called defrost operation, it is a widely used technique in heat pump heating.

  In the conventional general air conditioner, while the defrost operation is being performed, the indoor heat exchanger functions as an evaporator, and at this time, when the cross flow fan that is an indoor fan is rotated, Although cold air would have been blown out from the outlet even though it was supposed to be in heating operation, the rotation of the indoor fan (cross flow fan) was stopped during defrost operation. Therefore, the warm air blowing from the outlet is temporarily interrupted (during the defrost operation), and there is a problem that impairs the comfort of the user who requests the heating operation.

  The structure of the air conditioning apparatus 400 shown in this Embodiment 4 is the same as the air conditioning apparatus 100 of Embodiment 1, and detailed description is abbreviate | omitted. In addition to the functions of the air conditioner 100 according to the first embodiment, the air conditioner 400 according to the fourth embodiment performs control for electromagnetic induction heating of the crossflow fan 2 during the defrost operation. Other than the above, the second embodiment is the same as the first embodiment. For the sake of convenience, the air conditioner of Embodiment 4 will be referred to as an air conditioner 400 and the indoor unit will be referred to as an indoor unit 401 so that the description will not be unclear.

  In the air conditioner 400, the indoor control device 60 rotates the crossflow fan 2 having conductivity at the rotation speed set to the weak mode with the start of the defrost operation, and causes the induction heating coil 1 to have a high frequency alternating current. A current is supplied to heat the cross flow fan 2 by electromagnetic induction. As a result, even during the defrost operation, the air heated by the heat transfer from the cross flow fan 2 heated by electromagnetic induction is blown out from the outlet 5 as hot air, and the hot air blowing is interrupted. Even if it is not interrupted or interrupted, it takes a very short time, in other words, warm air can be blown from the outlet 5 even during the defrost operation, so that the comfort of the heating operation is improved.

  In the defrost operation, the power consumption of the compressor 70 is smaller than immediately after the start of the heat pump heating. For this reason, even when the compressor 70 is being driven, it is possible to sufficiently secure electric power that can be used for electromagnetic induction heating of the crossflow fan 2 with respect to the maximum allowable power consumption of the air-conditioning apparatus 400. Even when the cross-flow fan 2 is heated by electromagnetic induction during the defrosting operation, the indoor control device 60 considers the power consumption of the compressor 70 ascertained through the outdoor control device 80, and the maximum allowable power consumption of the air conditioner 400. Electric power is supplied to the induction heating coil 1 so as not to exceed. When the refrigeration cycle returns from the defrost operation to the heat pump heating again, the indoor control device 60 responds to the increase in power consumption (increase in the number of rotations) of the compressor 70, and the maximum allowable consumption of the air conditioner 400. In order not to exceed the electric power, the input electric power to the induction heating coil 1 is decreased.

  The air conditioner 400 is also heated by the heat transfer from the electromagnetic induction heated crossflow fan 2 during the preparation time of the heat pump heating operation at the start of the heating operation, similarly to the air conditioner 100 of the first embodiment. The warmed air is blown out as hot air from the air outlet 5, and the time from the user's instruction to start the heating operation to the time when the hot air satisfying the user blows out from the air outlet 5 is shortened.

  Further, in the case of electromagnetic induction heating of the cross flow fan 2 during the defrost operation, as shown by the air conditioner 200 of the second embodiment, the indoor control device 60 has the temperature that the cross flow fan 2 satisfies the user. Until the temperature rises to a temperature at which wind can be generated, electromagnetic induction heating is performed while rotating the cross-flow fan 2 with no air blowing rotation, and after such temperature rises, control is performed to increase the rotation speed with air blowing action. May be. If such control is performed, the blowing air that is not sufficiently warmed at the beginning of the defrost operation is not blown out, and the comfort of the heating operation can be further improved.

  Further, in the case of electromagnetic induction heating of the cross flow fan 2 during the defrost operation, as shown by the air conditioner 300 of the third embodiment, the indoor control device 60 has the temperature that the cross flow fan 2 satisfies the user. Until the temperature rises to a temperature at which wind can be generated, the air outlet 5 is closed with the up / down air direction control plate 7. When the temperature rises to such a temperature, the air flow control plate 7 is rotated to open the air outlet 5. You may control as follows. During normal defrosting operation, the vertical airflow direction control plate 7 is not rotated so as to close the air outlet 5, but in this case, the vertical airflow direction control plate 7 is rotated so as to close the air outlet 5 at the start of the defrosting operation. It is. If such control is performed, the blowing air that is not sufficiently warmed at the beginning of the defrost operation is not blown out, and the comfort of the heating operation can be further improved.

  As described above, the air conditioner 400 according to the fourth embodiment is disposed in the indoor unit 401 so as to be close to the crossflow fan 2 having conductivity and the crossflow fan 2, and is supplied with a high-frequency alternating current. When the defrost operation is performed during the heating operation, the indoor control device 60 rotates the cross flow fan 2 and the electromagnetic induction heating coil 1 during the defrost operation. Is supplied with an alternating current and heated by electromagnetic induction while rotating the cross flow fan 2, so that even during defrost operation, it is heated by heat transfer from the cross flow fan 2 that has been heated by electromagnetic induction heating. The hot air is blown out from the outlet 5 as hot air, and the blowing of hot air is not interrupted or is extremely short even if interrupted Since the while, it is possible to improve the comfort of the heating operation.

Embodiment 5 FIG.
Next, as Embodiment 5, an embodiment in which electromagnetic induction heating of the crossflow fan 2 having conductivity is utilized during a dehumidifying operation will be described.

  First, the dehumidifying operation will be described. The dehumidifying operation of a general heat pump air conditioner is to operate the refrigeration cycle with the same refrigerant flow as in the cooling operation, and cool the indoor air with the indoor heat exchanger functioning as an evaporator. As the dry bulb temperature decreases, the relative humidity increases and when water reaches saturation (dew point), the water vapor in the room air condenses into water (condensation), so this water (drain water) is drained outside the room. By doing so, moisture in the room air is removed. As the refrigeration cycle (heat pump cycle) is the same as the cooling operation, air that has been cooled by the indoor heat exchanger and lowered in temperature is blown out from the air outlet. Occur.

  For this reason, during the dehumidifying operation, the vertical wind direction control plate 7 is rotated so as to be substantially horizontal so that the cold air does not directly hit the user, and blown in a direction far from the indoor unit, The air volume is reduced by setting the rotation speed of the indoor fan (cross flow fan) to the minimum rotation speed (weak mode). The compressor is also rotated at a low speed to reduce the refrigerant circulation amount in the refrigeration cycle, so that a so-called weak cooling state is achieved.

  As described above, since the dehumidifying operation is a cooling operation as a refrigeration cycle, a decrease in room temperature cannot be suppressed even if control different from the normal cooling operation is performed. For users who are requesting to reduce only the humidity by dehumidifying operation, there is a problem that comfort is impaired due to a feeling of cold due to a decrease in room temperature caused by a decrease in humidity. Therefore, some recent heat pump type air conditioners employ a method called reheat dehumidification operation in order to suppress the decrease in room temperature during the dehumidification operation and only reduce the humidity.

  For this method, the indoor heat exchanger is thermally divided into two, and a refrigerant flow control valve is interposed between them. During the cooling operation, the refrigerant flow control valve is fully opened, and all the indoor heat exchangers are functioned as evaporators. Similarly, during the heating operation, the refrigerant flow control valve is fully opened, and all the indoor heat exchangers are operated as condensers. However, during the dehumidifying operation (reheat dehumidifying operation), the refrigerant flow direction in the refrigeration cycle is the same as in the cooling operation, but the expansion of the expansion valve in the outdoor unit is relaxed and the indoor heat is divided thermally. The refrigerant is also condensed in the indoor heat exchanger on the upstream side of the exchanger, the opening of the refrigerant flow control valve is reduced and reduced here, and the refrigerant is evaporated in the indoor heat exchanger on the downstream side.

  Dehumidification (humidity reduction) is performed by the evaporative heat of the downstream indoor heat exchanger, and at the same time, the temperature of the intake indoor air decreases, but the intake indoor air is warmed by the heat of condensation in the upstream indoor heat exchanger. This compensates for the temperature drop due to the indoor heat exchanger on the downstream side, and blowout air from which the humidity is lowered but the temperature is not lowered is blown out from the outlet.

  However, even when dehumidification is performed by such reheat dehumidification operation, the dehumidification amount is affected by the size of the indoor heat exchanger functioning as an evaporator (the larger the size, the greater the dehumidification amount). In addition, the size of the indoor heat exchanger that can be mounted naturally is limited due to the limited dimensions of the indoor unit, and it can be dehumidified only with one of the indoor heat exchangers divided into two parts. However, the capacity of dehumidification is lower than that using all indoor heat exchangers for dehumidification.

  In addition, since the crossflow fan, which is an indoor fan, is in contact with air with high humidity, that is, air that contains a large amount of moisture, there is a risk that mold will form on the crossflow fan due to condensed moisture. On the other hand, the crossflow fan can be dried by long-time blowing operation (empty operation) to suppress the growth of mold, but the mold cannot be completely killed only by drying, Eventually it could lead to proliferation.

  The structure of the air conditioning apparatus 500 shown in this Embodiment 5 is the same as the air conditioning apparatus 100 of Embodiment 1, and detailed description is abbreviate | omitted. In addition to the functions of the air conditioner 100 according to the first embodiment, the air conditioner 500 according to the fifth embodiment performs control to electromagnetically heat the cross flow fan 2 during the dehumidifying operation. Other than the above, the second embodiment is the same as the first embodiment. For the sake of convenience, the air conditioner of Embodiment 5 will be referred to as an air conditioner 500 and the indoor unit will be referred to as an indoor unit 501 so that the description will not be unclear.

  In this air conditioning apparatus 500, when the indoor control device 60 receives the instruction of the dehumidifying operation start by the user's remote controller 15 or the timer setting, the indoor control device 60 is connected to the induction heating coil 1. A high-frequency alternating current is supplied to electromagnetically heat the cross flow fan 2 rotating for the dehumidifying operation. The indoor heat exchanger 3 is not configured to be thermally divided, and no refrigerant flow control valve is provided in the middle of the piping of the indoor heat exchanger 3. During the dehumidifying operation, all the indoor heat exchangers 3 function as evaporators.

  The indoor air sucked into the indoor unit 501 from the suction port 4 during the dehumidifying operation is dehumidified by the moisture contained therein when it passes through the indoor heat exchanger 3 functioning as an evaporator. The condensed moisture is drained to the outside through a drain hose as drain water. When passing through the indoor heat exchanger 3, the indoor air is cooled to cause a temperature drop. However, the indoor air is heated by electromagnetic induction after passing through the indoor heat exchanger 3, and the temperature is increased. When passing through 2, it is warmed by heat transfer from the cross flow fan 2, compensates for the temperature drop caused by passing through the indoor heat exchanger 3, and is blown out from the outlet 5. As a result, it is possible to prevent the temperature of the air blown out from the blowout port 5 (blowing air) from being lowered with respect to the air sucked from the suction port 4.

  As a result, the indoor heat exchanger is divided into two parts, and one of the indoor heat exchangers functions as an evaporator and the other functions as a condenser. Even if it performs, since the fall of room temperature can be suppressed, the user who requests | requires only dehumidification (humidity fall) and instruct | indicates dehumidification operation does not feel the cold by a room temperature fall, and can improve the comfort of dehumidification driving | operation.

  Moreover, since all the indoor heat exchangers 3 function as evaporators, the dehumidifying capacity can be increased as compared with the reheat dehumidifying operation in which the indoor heat exchanger is divided into two parts thermally. The arrival time can be shortened, and a comfortable humidity space can be provided to the user earlier.

  In the dehumidifying operation, the maximum rotational speed of the compressor 70 is limited to be lower than that in the cooling operation, and the power consumption of the compressor 70 is smaller than that in the cooling operation. Therefore, even when the compressor 70 is being driven, it is possible to sufficiently secure power that can be used for electromagnetic induction heating of the crossflow fan 2 with respect to the maximum allowable power consumption of the air conditioning apparatus 500. Even when the cross-flow fan 2 is heated by electromagnetic induction during the dehumidifying operation, the maximum allowable value of the air conditioner 500 is taken into consideration while taking into consideration the power consumption of the compressor 70 that the indoor controller 60 grasps through the outdoor controller 80. The power supplied to the induction heating coil 1 is controlled so as not to exceed the power consumption.

  The indoor control device 60 keeps the room temperature measured by the room temperature sensor or the suction temperature sensor during the dehumidification operation of the air conditioner 500 so that the room temperature or the suction room air temperature at the beginning of the dehumidification operation is maintained. The power supplied to the induction heating coil 1 is adjusted according to the room air temperature sucked into the machine 501 to control the temperature of the cross flow fan 2 that performs electromagnetic induction heating. If the current room temperature tends to be lower than the room temperature at the beginning of the dehumidifying operation, the power supplied to the induction heating coil 1 is increased and the temperature of the cross flow fan 2 is increased. As a result, a decrease in room temperature due to insufficient heating and an increase in room temperature due to excessive heating can be avoided, and comfort during dehumidifying operation is further improved.

  In addition, the temperature of the indoor heat exchanger 3 corresponding to the evaporation temperature of the refrigerant measured by the temperature sensor may be used as a parameter for electromagnetic induction heating amount control. By adding this, the change tendency of the room temperature can be predicted, that is, if the temperature of the indoor heat exchanger 3 is lowered, the indoor temperature is lowered, so that the temperature change of the indoor heat exchanger 3 is detected. Thus, the power supplied to the induction heating coil 1 is changed. Accordingly, it is possible to avoid a decrease in the room temperature due to insufficient heating and an increase in the room temperature due to excessive heating, and fine control is possible, the room temperature can be further stabilized, and the comfort during the dehumidifying operation can be further increased.

  In the air conditioning apparatus 500 as well, as in the air conditioning apparatus 100 of the first embodiment, at the start of the heating operation, during the preparation time for the heat pump heating operation, heat transfer from the cross flow fan 2 heated by electromagnetic induction heating is performed. The warmed air is blown out as hot air from the air outlet 5, and the time from the user's instruction to start the heating operation to the time when the hot air satisfying the user blows out from the air outlet 5 is shortened.

  As described above, the air-conditioning apparatus 500 according to Embodiment 5 is disposed in the indoor unit 501 so as to be close to the cross flow fan 2 having conductivity and the cross flow fan 2, and a high-frequency alternating current is generated. And an induction heating coil 1 to be supplied. During the dehumidifying operation, the indoor control device 60 supplies an alternating current to the electromagnetic induction heating coil 1 and electromagnetically heats the rotating cross flow fan 2. Thus, when the indoor air passes through the cross flow fan 2, it is warmed by heat transfer from the cross flow fan 2 to compensate for the temperature drop that occurs when it passes through the indoor heat exchanger 3. Therefore, it is possible to suppress a decrease in the room temperature during the dehumidifying operation and to improve the comfort of the dehumidifying operation without feeling cold by the user who requests only the dehumidifying operation.

  Further, during the dehumidifying operation, all the indoor heat exchanger 3 can function as an evaporator and can be dehumidified, so that the indoor heat exchanger is thermally divided into two parts without increasing the size of the air conditioner 500. Compared to reheat dehumidification operation, the amount of dehumidification can be greatly increased, so the time required to reach the target humidity required by the user can be shortened, and the user can be provided with a faster and more comfortable humidity space. it can.

  Further, during the dehumidifying operation, the cross flow fan 2 that is rotating and performing the air blowing action is heated by electromagnetic induction so as to increase the temperature, thereby preventing the condensed water from adhering to the cross flow fan 2 and the mold. Can be killed by high-temperature heat, and it is possible to prevent the malodor caused by mold from being released into the room without causing mold growth.

  Further, it is not necessary to thermally separate the indoor heat exchanger 3 into two parts, and to install a refrigerant flow rate control valve for reheat dehumidification or a soundproof material to be installed around the flow rate control valve. Therefore, the structure of the indoor unit 501 of the air conditioner 500 can be simplified and the cost can be reduced, although the dehumidifying operation that does not cause a decrease in room temperature is possible.

Embodiment 6 FIG.
Next, as Embodiment 6, an embodiment in which electromagnetic induction heating of the crossflow fan 2 having conductivity is utilized during a drying operation inside the indoor unit will be described.

  First, the internal drying operation of the indoor unit will be described. After the cooling operation or dehumidifying operation, moisture in the condensed air often adheres to the surface of the indoor heat exchanger, and the drying operation that dries the interior of the indoor unit to remove the moisture There is an air conditioner that performs. There are several methods for the internal drying operation. As a specific example, it is a predetermined time, for example, that only the indoor fan is idled without operating the refrigeration cycle, that is, the air blowing operation of the cross flow fan that is an indoor fan. After about 30 minutes, a weak heat pump heating operation and a recirculation operation by a refrigeration cycle are performed for about 5 to 15 minutes, respectively, to evaporate the attached water. This prevents the occurrence of mold inside the indoor unit.

  However, in such an internal drying operation, the moisture in the indoor heat exchanger whose temperature has been increased by heat pump heating can be evaporated, but the moisture adhering to the cross flow fan, which is an indoor fan, is completely removed only by the empty operation. There was a risk of mold generation and proliferation on the surface of the crossflow fan.

  The structure of the air conditioning apparatus 600 shown in this Embodiment 6 is the same as the air conditioning apparatus 100 of Embodiment 1, and detailed description is abbreviate | omitted. In addition to the functions of the air conditioner 100 according to the first embodiment, the air conditioner 600 according to the sixth embodiment also performs cross flow during a drying operation that dries the interior of the indoor unit that is performed after the cooling operation or the dehumidifying operation. The fan 2 is controlled to be heated by electromagnetic induction, and the rest is the same as in the first embodiment. For the sake of convenience, the air conditioner of Embodiment 6 will be referred to as an air conditioner 600 and the indoor unit will be referred to as an indoor unit 601 so that the description will not be unclear.

  In this air conditioner 600, when the cooling operation or the dehumidifying operation is instructed by the user's remote controller 15 or by the timer setting, and the cooling operation or the dehumidifying operation is ended, the user's request is set (set by the remote controller 15). The internal control is performed, and at the same time, the indoor control device 60 supplies high-frequency alternating current to the induction heating coil 1 and rotates the cross flow fan 2 to perform electromagnetic induction. Heat.

  Thereby, since the cross flow fan 2 is heated to high temperature by electromagnetic induction heating, the water adhering to the cross flow fan 2 can be evaporated and removed. Therefore, since the moisture of the cross flow fan 2 can be completely removed and dried, it is possible to prevent mold on the surface of the cross flow fan 2 and growth of mold. And it can avoid that the malodor caused by mold | fungi is discharge | released indoors.

  In addition, since electromagnetic induction heating is performed while the cross flow fan 2 is rotated, the time for the air flow operation (empty operation) of the cross flow fan 2 for drying in the internal drying operation can be shortened, and as a result, the internal drying operation time can be reduced. It can be shortened.

  The heat pump heating in the internal drying operation is weak heating, the rotation speed of the compressor 70 is low, and the power consumption of the compressor 70 is small. Therefore, in the internal drying operation, the heat pump heating and the electromagnetic induction heating of the cross flow fan 2 are performed. Even if it cooperates, the electric power for electromagnetic induction heating of the cross flow fan 2 can be sufficiently ensured without exceeding the maximum allowable power consumption of the air conditioner 600.

  In the air conditioning apparatus 600, at the start of the heating operation, as in the air conditioning apparatus 100 of the first embodiment, during the heat pump heating operation preparation time, heat transfer from the electromagnetic induction heated crossflow fan 2 is performed. The warmed air is blown out as hot air from the air outlet 5, and the time from the user's instruction to start the heating operation to the time when the hot air satisfying the user blows out from the air outlet 5 is shortened.

  As described above, the air-conditioning apparatus 600 according to Embodiment 6 is disposed in the indoor unit 601 so as to be close to the crossflow fan 2 having conductivity and the crossflow fan 2, and a high-frequency alternating current is generated. An induction heating coil 1 to be supplied, and the indoor control device 60 performs electromagnetic induction heating while rotating the cross flow fan 2 during the drying operation inside the indoor unit 601 after the cooling operation or the dehumidifying operation. As a result, the temperature of the crossflow fan 2 becomes high, and moisture adhering to the surface of the crossflow fan 2 can be evaporated, so that the mold does not generate or multiply in the crossflow fan 2, It is possible to avoid the bad odor caused by mold being blown into the room.

  Moreover, since the time of the airflow operation (empty operation) of the cross flow fan 2 in the internal drying operation of the indoor unit 601 can be shortened or the airflow operation can be abolished, the time of the internal drying operation can be greatly shortened. .

  In any of the above embodiments, the control performed by the indoor control device 60 includes control performed by the indoor control device 60 communicating with the outdoor control device 80 and cooperating with the outdoor control device 80. Similarly, the control performed by the outdoor control device 80 includes control performed by the outdoor control device 80 communicating with the indoor control device 60 and cooperating with the indoor / outdoor control device 60.

  DESCRIPTION OF SYMBOLS 1 Induction heating coil, 2 Cross flow fan, 3 Indoor heat exchanger, 3a Front lower heat exchanger, 3b Front upper heat exchanger, 3c Rear heat exchanger, 4 Inlet, 5 Outlet, 6 Filter, 7 Up and down air direction Control plate, 8 Right / left air direction control plate, 9 Casing, 10 Housing, 10a Bearing part, 11 Front opening / closing panel, 12 Nozzle, 13 Current supply circuit, 14 Remote control receiving part, 15 Remote control, 21 Toroidal flat plate, 22 Blade, 23 Connecting boss, 24 Motor side end plate, 25 Counter motor side end plate, 26 Rotating shaft, 31 Fin, 32 Copper pipe, 45 Fan motor, 45a Drive shaft, 51 Air outlet side, 60 Indoor control device, 61 Signal line, 70 Compressor, 71 Four-way valve, 72 Outdoor heat exchanger, 73 Expansion valve, 74 Propeller fan, 75a Liquid side connection piping, 75b Gas side connection 80, outdoor control device, 91 storage recess, 92 heat insulating material, 100 air conditioner, 101 indoor unit, 102 outdoor unit, 200 air conditioner, 201 indoor unit, 300 air conditioner, 301 indoor unit, 400 air conditioner, 401 indoor unit, 500 air conditioner, 501 indoor unit, 600 air conditioner, 601 indoor unit.

Claims (6)

An air conditioner having an indoor unit and an outdoor unit each having a heat exchanger, and a refrigeration cycle in which refrigerant is circulated by a compressor installed in the outdoor unit,
A control device for controlling the operation of the air conditioner;
A casing that constitutes an outline of the indoor unit and has an air inlet and an outlet for indoor air;
A cross-flow fan that is formed to have electrical conductivity, is installed in the housing, sucks indoor air from the suction port, and blows out the blowout port,
An induction heating coil disposed in the vicinity of the cross flow fan and supplied with a high-frequency alternating current;
When an instruction to start heating operation is transmitted to the control device,
The control device is
While controlling to start the compressor and operate the refrigeration cycle ,
The cross-flow fan is rotated, to supply an alternating current having a high frequency to the induction heating coil, the heat pump heating operation preparation time until the heat pump heating rises by the refrigerating cycle, the electromagnetic while rotating the cross flow fan Induction heating ,
The indoor air heated by the heat transfer of the cross flow fan heated by electromagnetic induction when passing through the cross flow fan is blown out from the air outlet,
The controller is
In electromagnetic induction heating while rotating the cross flow fan during the heat pump heating operation preparation time,
The cross flow fan is controlled so that the rotational speed of the cross flow fan is set to a low rotational speed without a blowing action for a predetermined time from the start of the electromagnetic induction heating, and is increased to a rotational speed with a blowing action after a predetermined time has elapsed. Air conditioner. The air conditioner according to claim 1, wherein the low rotational speed without the air blowing action is 25 to 35 rpm . The control device is
By repeating the application of a voltage to a fan motor that rotationally drives the cross flow fan and the release of the application while the rotation speed of the cross flow fan is increasing, the cross flow fan is caused to perform the air blowing action. The air conditioner according to claim 1 or 2 , wherein the air conditioner is rotated at a low rotational speed that is not accompanied. The control device is
Depending on the temperature of the room where the indoor unit is installed, the air conditioning apparatus according to any one of claims 1 to 3, characterized in that changing the predetermined time. A casing constituting the back side of the air passage of the cross flow fan;
In the vicinity of the cross flow fan of the casing, provided recessed in the rear direction of the indoor unit, and a storage recess for storing the induction heating coil,
The induction heating coil is
The air conditioner according to any one of claims 1 to 4 , wherein the air conditioner is housed in the housing recess so as not to protrude into the air passage. The air conditioner according to claim 5 , wherein a heat insulating material is interposed between the induction heating coil and the housing recess.

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