JP5353250B2 - Electromagnetic induction heating unit and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating unit capable of suppressing leakage of a magnetic field to the periphery while suppressing local heat generation even when refrigerant piping is heated by electromagnetic induction, and an air conditioner. <P>SOLUTION: The electromagnetic induction heating unit for heating the refrigerant piping by electromagnetic induction includes a coil 68 and an outer member 75. The coil 68 is arranged in the vicinity of the refrigerant piping. The outer member 75 is arranged on the outer side opposite to the inner side which is the refrigerant piping side of the coil 68, is made to circle around the refrigerant piping in the circumferential direction and includes a magnetic material. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electromagnetic induction heating unit and an air conditioner.

  The refrigeration cycle includes a radiator that releases heat of the refrigerant, a heater that gives heat to the refrigerant, and the like. For example, the refrigerant circulating in the refrigeration cycle obtains heat by exchanging heat with indoor air in the cooling operation cycle, and exchanges heat with outdoor air in the heating operation cycle. Getting fever.

  According to the refrigeration cycle of an air conditioner described in Patent Document 1 (Japanese Patent Laid-Open No. Hei 8-210720) shown below, not only heat is obtained from indoor air or outdoor air as described above, but refrigerant heating is performed separately. A system has been proposed in which a refrigerant obtains heat with an apparatus. In this refrigerant heating apparatus, heat is applied to the refrigerant flowing through the heat exchanger by heating the heat exchanger through which the refrigerant flows with a burner. Thus, since this air conditioner employs a refrigerant heating device, when the refrigerant requires heat, it is possible to heat the refrigerant without being restricted by indoor or outdoor temperature. ing.

  As the refrigerant heating device as described above, an electromagnetic induction heating method can be adopted as an electric method, instead of a heating method using a burner or the like. For example, an electromagnetic induction coil is wound around a refrigerant pipe containing a magnetic material, and the refrigerant pipe can be caused to generate heat due to a magnetic flux generated by passing an electric current through the electromagnetic induction heating coil. And the refrigerant | coolant can be heated using the heat_generation | fever in this refrigerant | coolant piping.

  However, when the refrigerant pipe is heated by electromagnetic induction, a magnetic field is generated in a portion other than the refrigerant pipe. On the other hand, it is conceivable to arrange a member that guides the magnetic field generated outside as described above. However, if a local eddy current is generated in such a member, local heat generation occurs. .

  The present invention has been made in view of the above-described points, and an object of the present invention is to suppress leakage of a magnetic field to the surroundings while suppressing local heat generation even when the refrigerant pipe is heated by electromagnetic induction. The object is to provide an electromagnetic induction heating unit and an air conditioner that can be used.

An electromagnetic induction heating unit according to a first aspect of the present invention is an electromagnetic induction heating unit that heats a refrigerant pipe and / or a member that is in thermal contact with the refrigerant flowing in the refrigerant pipe, and includes a coil, an external member, and a magnetic body portion . I have. The coil is disposed in the vicinity of the refrigerant pipe. The external member is disposed on the outer side opposite to the inner side, which is the refrigerant piping side of the coil, and includes a magnetic body. The magnetic part has at least a portion disposed outside the coil and inside the external member, and includes a magnetic substance. The external member is provided so as to be continuous in the circumferential direction with respect to the refrigerant pipe, and the magnetic body portion is provided so as not to be continuous in the circumferential direction with respect to the refrigerant pipe. In addition, as heating by the electromagnetic induction heating unit here, for example, when electromagnetic induction heating is performed on a heat generating member that is in thermal contact with the refrigerant pipe, heat generation that is in thermal contact with the refrigerant flowing in the refrigerant pipe The case where the member is heated by electromagnetic induction and the case where the heating member constituting at least a part of the refrigerant pipe is heated by electromagnetic induction are included at least.

  When a current is passed through the coil to cause electromagnetic induction, a magnetic field is also generated at a position opposite to the refrigerant piping side with respect to the coil. In this case, if a magnetic material is present around the electromagnetic induction heating unit, unintentional heat generation may occur.

  On the other hand, in this electromagnetic induction heating unit, an external member including a magnetic body is disposed at a position opposite to the refrigerant piping side with respect to the coil. For this reason, the magnetic flux generated in parts other than the refrigerant pipes easily passes through the external member. Furthermore, since this external member goes around the refrigerant pipe in the circumferential direction, the magnetic field leaking to the outside of the external member can be reduced. Since the external member is continuous in the circumferential direction, local eddy currents are hardly generated, and local heat generation can be suppressed. Thereby, it is possible to reduce the leakage of the magnetic field while suppressing local heat generation of the external member.

  Moreover, in this electromagnetic induction heating unit, it is induced to pass not only in the external member but also in the magnetic part. This makes it possible to effectively suppress magnetic field leakage.

  An electromagnetic induction heating unit according to a second aspect of the present invention is the electromagnetic induction heating unit according to the first aspect of the present invention, wherein the magnetic body portion includes ferrite.

  In this electromagnetic induction heating unit, a magnetic field that attempts to leak to the surroundings when current is passed through the coil for electromagnetic induction heating is efficiently induced in the ferrite. And since ferrite has a small electrical resistance, it does not easily generate heat even when a current flows through it. Accordingly, it is possible to improve the reliability of the device by suppressing the heat generation of the peripheral members while suppressing the leakage of the magnetic field to the outside.

  The electromagnetic induction heating unit according to a third aspect of the present invention is the electromagnetic induction heating unit according to the first aspect of the present invention, wherein the magnetic body portion is configured to contain ferrite, and the external member has a lower magnetic permeability than the magnetic body portion. It is constituted by.

Electromagnetic induction heating unit according to a fourth invention, in any one of the electromagnetic induction heating unit of the first through third aspects of the present invention, the coil, it surrounds at least a portion around the refrigerant pipe.

  In this electromagnetic induction heating unit, a part of the magnetic flux generated by passing a current through the coil can be made to extend in the direction in which the refrigerant pipe extends. For this reason, the heating efficiency by electromagnetic induction can be improved when the longitudinal direction of the magnetic body contained in the refrigerant pipe and the axial direction of the refrigerant pipe are substantially the same.

The electromagnetic induction heating unit according to a fifth aspect of the present invention is the electromagnetic induction heating unit according to any one of the first to fourth aspects of the present invention, wherein the external member has a connecting portion by welding in at least one part in the circumferential direction.

  In this electromagnetic induction heating unit, since a part of the outer member in the circumferential direction is connected by welding, a local contact portion between the outer edges of the outer member is unlikely to exist. For this reason, even if a current is passed through the coil for electromagnetic induction, heat generated in the local contact portion is unlikely to occur. Thereby, even if it is a case where the circumference | surroundings of refrigerant | coolant piping are made a round by connecting a part of the circumferential direction of an external member, local heat_generation | fever can be suppressed.

The electromagnetic induction heating unit according to a sixth aspect of the present invention is the electromagnetic induction heating unit according to any one of the first to fifth aspects of the invention, wherein the external member and the magnetic part are on a plane perpendicular to the direction in which the refrigerant pipe extends. When the refrigerant pipe is viewed from the outside, the refrigerant pipe has a portion arranged at a position overlapping each other.

  In this electromagnetic induction heating unit, when a current is passed through the coil for electromagnetic induction heating, a magnetic field that is about to leak to the surroundings is induced to pass not only in the external member but also in the magnetic body portion. Thereby, it becomes possible to suppress effectively by a double magnetic field induction member.

The electromagnetic induction heating unit according to a seventh aspect of the present invention is the electromagnetic induction heating unit according to any one of the first to sixth aspects of the present invention, wherein both ends of the external member are on the inner side than both ends of the magnetic body in the direction in which the refrigerant pipe extends. Is located.

  In this electromagnetic induction heating unit, the magnetic field generated on the side opposite to the refrigerant pipe side with respect to the coil is easily captured by the magnetic body portion before reaching the external member. For this reason, a magnetic body part comes to be able to guide a magnetic field more efficiently. Thereby, it becomes possible to further improve the double magnetic field leakage prevention effect by the magnetic part and the external member.

  An electromagnetic induction heating unit according to an eighth aspect of the present invention is the electromagnetic induction heating unit according to the seventh aspect of the present invention, wherein the material of the magnetic body portion is a material that collects magnetic flux more easily than an external member.

  In this electromagnetic induction heating unit, the magnetic field generated on the side opposite to the refrigerant pipe side with respect to the coil is guided to the magnetic body part that collects magnetic flux more easily than the external member. Thereby, since the reduction effect of the magnetic flux leakage by a magnetic body part is large, the burden of the external member for suppressing the magnetic field leakage to the circumference | surroundings can be suppressed. Thereby, it is possible to further reduce the magnetic field leaking to the outside of the external member.

The electromagnetic induction heating unit according to a ninth aspect of the present invention is the electromagnetic induction heating unit according to any one of the first to eighth aspects of the invention, wherein the magnetic body portion and the external member are positioned so that there is no portion in direct contact.

  In this electromagnetic induction heating unit, since the magnetic body portion and the external member are arranged so as not to contact each other, there is no local contact portion. For this reason, even if a current is passed through the coil for electromagnetic induction, the concentration of magnetic flux hardly occurs. Thereby, the partial temperature rise resulting from concentration of magnetic flux can be suppressed.

  An air conditioner according to a tenth aspect of the invention includes the electromagnetic induction heating unit according to any one of claims 1 to 9 and a refrigeration cycle including a portion for flowing the refrigerant through the refrigerant pipe.

  In this air conditioner, even when electromagnetic induction heating is performed in the air conditioner, leakage of the magnetic field can be reduced.

An air conditioner according to an eleventh aspect of the present invention includes an electromagnetic induction heating unit, a refrigeration cycle including a portion for flowing a refrigerant through a refrigerant pipe, and a contacted member. The electromagnetic induction heating unit is an electromagnetic induction heating unit that heats a refrigerant pipe and / or a member that is in thermal contact with the refrigerant flowing in the refrigerant pipe, and includes a coil, an external member, and a protruding member. The coil is disposed in the vicinity of the refrigerant pipe. The external member is disposed on the outer side opposite to the inner side on the refrigerant piping side of the coil, circulates the refrigerant piping in the circumferential direction, and includes a magnetic body. The protruding member has a portion fixed to the external member and extending toward the outside of the external member. In addition, as heating by the electromagnetic induction heating unit here, for example, when electromagnetic induction heating is performed on a heat generating member that is in thermal contact with the refrigerant pipe, heat generation that is in thermal contact with the refrigerant flowing in the refrigerant pipe The case where the member is heated by electromagnetic induction and the case where the heating member constituting at least a part of the refrigerant pipe is heated by electromagnetic induction are included at least. The contacted member is disposed outside the external member, and stops at least the electromagnetic induction heating unit from dropping in a state of being in contact with the protruding member. The protruding member and the contacted member are in contact with each other in a state in which the electromagnetic induction heating unit is kept falling, and are arranged so that there is no contact portion before the electromagnetic induction heating unit starts to drop.

  In this air conditioner, the electromagnetic induction heating unit can be dropped midway.

An air conditioner according to a twelfth aspect of the present invention includes an electromagnetic induction heating unit, a refrigeration cycle including a portion for flowing a refrigerant through a refrigerant pipe, and a contacted member. The electromagnetic induction heating unit is an electromagnetic induction heating unit that heats a refrigerant pipe and / or a member that is in thermal contact with the refrigerant flowing in the refrigerant pipe, and includes a coil, an external member, and a protruding member. The coil is disposed in the vicinity of the refrigerant pipe. The external member is disposed on the outer side opposite to the inner side on the refrigerant piping side of the coil, circulates the refrigerant piping in the circumferential direction, and includes a magnetic body. The protruding member has a portion fixed to the external member and extending toward the outside of the external member. In addition, as heating by the electromagnetic induction heating unit here, for example, when electromagnetic induction heating is performed on a heat generating member that is in thermal contact with the refrigerant pipe, heat generation that is in thermal contact with the refrigerant flowing in the refrigerant pipe The case where the member is heated by electromagnetic induction and the case where the heating member constituting at least a part of the refrigerant pipe is heated by electromagnetic induction are included at least. The contacted member is disposed outside the external member, and prevents at least the rotation of the electromagnetic induction heating unit in a state of being in contact with the protruding member. The protruding member and the abutted member are arranged so as to be in contact with each other while the rotation of the electromagnetic induction heating unit is stopped, and so that there is no contact portion before the electromagnetic induction heating unit starts to rotate.

  In this air conditioner, the rotation of the electromagnetic induction heating unit can be stopped halfway.

An air conditioner according to a thirteenth aspect of the present invention includes an electromagnetic induction heating unit, a refrigeration cycle including a portion for allowing the refrigerant to flow through the refrigerant pipe, an abutted fall preventing member, and an abutted rotation preventing member. The electromagnetic induction heating unit is an electromagnetic induction heating unit that heats a refrigerant pipe and / or a member that is in thermal contact with the refrigerant flowing in the refrigerant pipe, and includes a coil, an external member, and a protruding member. The coil is disposed in the vicinity of the refrigerant pipe. The external member is disposed on the outer side opposite to the inner side on the refrigerant piping side of the coil, circulates the refrigerant piping in the circumferential direction, and includes a magnetic body. The protruding member has a portion fixed to the external member and extending toward the outside of the external member. In addition, as heating by the electromagnetic induction heating unit here, for example, when electromagnetic induction heating is performed on a heat generating member that is in thermal contact with the refrigerant pipe, heat generation that is in thermal contact with the refrigerant flowing in the refrigerant pipe The case where the member is heated by electromagnetic induction and the case where the heating member constituting at least a part of the refrigerant pipe is heated by electromagnetic induction are included at least. The contacted fall prevention member is disposed outside the external member, and prevents at least the electromagnetic induction heating unit from dropping in a state of being in contact with the protruding member. The contacted rotation preventing member is disposed outside the external member, and prevents at least the rotation of the electromagnetic induction heating unit in a state of being in contact with the protruding member. The protruding member and the contacted fall prevention member are arranged so that they are in contact with each other while the electromagnetic induction heating unit is kept falling, and there is no contact portion before the electromagnetic induction heating unit starts to fall. The protruding member and the contacted rotation preventing member are arranged so as to be in contact with each other while the rotation of the electromagnetic induction heating unit is stopped, and so that there is no contact portion before the electromagnetic induction heating unit starts to rotate.

  In this air conditioner, it is possible to combine the members required for the electromagnetic induction heating unit into one in order to stop the dropping and rotation of the electromagnetic induction heating unit halfway.

  An air conditioner according to a fourteenth aspect is the air conditioner according to any one of the eleventh aspect to the thirteenth aspect, wherein the electromagnetic induction heating unit is radially inward from the outer periphery of the refrigerant pipe in order to determine the relative position of the refrigerant pipe. Further, a fixing member having a portion for applying a force to is provided. The fixing member has a thermal expansion coefficient different from that of the refrigerant pipe. The refrigerant pipe is thermally expanded by a magnetic field generated when electric power is supplied to the coil.

  When the refrigerant pipe undergoes rapid thermal expansion due to electromagnetic induction heating or shrinks due to a temperature drop, the fixed state between the refrigerant pipe and the fixing member and the refrigerant pipe that have different thermal expansion coefficients cannot be maintained. There is a fear. If it does so, an external member may fall or rotate without being able to maintain a fixed state.

  On the other hand, in this air conditioner, even if the electromagnetic induction heating unit falls or rotates without being able to maintain a fixed state, the electromagnetic induction heating unit falls and rotates within a predetermined range. It becomes possible to fasten.

  Even when the refrigerant pipe is thermally expanded or vibrates due to the operation of the refrigeration cycle, the rotation or the fall is easily stopped midway.

In the electromagnetic induction heating unit of the first invention, it is possible to effectively suppress leakage of the magnetic field while suppressing local heat generation of the external member.

  In the electromagnetic induction heating unit of the second invention, it is possible to improve the reliability of the device by suppressing the heat generation of the peripheral members while suppressing the leakage of the magnetic field to the outside.

In the electromagnetic induction heating unit of the fourth invention, heating efficiency by electromagnetic induction can be improved when the longitudinal direction of the magnetic body contained in the refrigerant pipe and the axial direction of the refrigerant pipe are substantially the same.

In the electromagnetic induction heating unit according to the fifth aspect of the present invention, local heat generation can be suppressed even when the circumference of the refrigerant pipe is made a round by connecting a part of the outer member in the circumferential direction.

  In the electromagnetic induction heating unit according to the sixth aspect of the invention, it is possible to effectively suppress the double magnetic field induction member.

  In the electromagnetic induction heating unit according to the seventh aspect of the invention, it is possible to further improve the double magnetic field leakage prevention effect by the magnetic body portion and the external member.

  In the electromagnetic induction heating unit according to the eighth aspect of the invention, the magnetic field leaking to the outside of the external member can be further reduced.

  In the electromagnetic induction heating unit according to the ninth aspect of the invention, it is possible to suppress a partial temperature rise caused by the concentration of magnetic flux.

  In the air conditioner according to the tenth aspect, leakage of the magnetic field can be reduced.

  In the air conditioner of the eleventh aspect of the invention, the electromagnetic induction heating unit can be stopped midway.

  In the air conditioner of the twelfth aspect, the rotation of the electromagnetic induction heating unit can be stopped halfway.

  In the air conditioner of the thirteenth aspect, the members necessary for the electromagnetic induction heating unit can be combined into one to keep the electromagnetic induction heating unit from dropping and rotating halfway.

  In the air conditioner of the fourteenth aspect, the electromagnetic induction heating unit can be kept from falling and rotating within a predetermined range.

It is a refrigerant circuit figure of the air harmony device concerning one embodiment of the present invention. It is an external appearance perspective view including the front side of an outdoor unit. It is an internal arrangement configuration perspective view of an outdoor unit. It is an external appearance perspective view containing the back side of the internal arrangement structure of an outdoor unit. It is a whole front perspective view which shows the internal structure of the machine room of an outdoor unit. It is a perspective view which shows the internal structure of the machine room of an outdoor unit. It is a perspective view of a bottom plate of an outdoor unit and an outdoor heat exchanger. It is a top view about the arrangement | positioning relationship of an electromagnetic induction heating unit. It is a schematic perspective view of the electromagnetic induction heating unit attached to the accumulation tube. It is an external appearance perspective view of the state which removed the shielding cover from the electromagnetic induction heating unit. It is sectional drawing of the electromagnetic induction heating unit attached to the accumulation pipe | tube. It is a figure which shows the attachment state of a thermistor and a fuse. It is explanatory drawing of the state which the magnetic flux has arisen around the electromagnetic induction heating unit. It is a schematic perspective view of a 1st ferrite case. It is a figure of the screwing part vicinity of the upper side of a 1st ferrite case. It is a figure of the screwing part vicinity of the downward side of a 1st ferrite case. It is a top view of a shielding cover. It is a front view of a shielding cover. It is a figure which shows a mode that a ferrite preferentially guides a magnetic flux over a shielding cover. It is a top view of the shielding cover of other embodiment (A). It is explanatory drawing of refrigerant | coolant piping of other embodiment (C). It is explanatory drawing of refrigerant | coolant piping of other embodiment (D). It is a figure which shows the example of arrangement | positioning with the coil and refrigerant | coolant piping of other embodiment (E). It is a figure which shows the example of arrangement | positioning of the bobbin lid of other embodiment (E). It is a figure which shows the example of arrangement | positioning of the ferrite case of other embodiment (E).

  Hereinafter, an air conditioner 1 including an electromagnetic induction heating unit 6 according to an embodiment of the present invention will be described as an example with reference to the drawings.

<1-1> Air conditioner 1
FIG. 1 is a refrigerant circuit diagram showing a refrigerant circuit 10 of the air conditioner 1.

  The air conditioner 1 is an air conditioner in a space where a use side device is arranged by connecting an outdoor unit 2 as a heat source side device and an indoor unit 4 as a use side device by a refrigerant pipe. , Compressor 21, four-way switching valve 22, outdoor heat exchanger 23, outdoor electric expansion valve 24, accumulator 25, outdoor fan 26, indoor heat exchanger 41, indoor fan 42, hot gas bypass valve 27, capillary tube 28 and An electromagnetic induction heating unit 6 and the like are provided.

  The compressor 21, the four-way switching valve 22, the outdoor heat exchanger 23, the outdoor electric expansion valve 24, the accumulator 25, the outdoor fan 26, the hot gas bypass valve 27, the capillary tube 28, and the electromagnetic induction heating unit 6 are included in the outdoor unit 2. Is housed in. The indoor heat exchanger 41 and the indoor fan 42 are accommodated in the indoor unit 4.

  The refrigerant circuit 10 includes a discharge pipe A, an indoor gas pipe B, an indoor liquid pipe C, an outdoor liquid pipe D, an outdoor gas pipe E, an accumulator pipe F, a suction pipe G, a hot gas bypass circuit H, and a branch pipe K. And a merging pipe J. The indoor side gas pipe B and the outdoor side gas pipe E pass a large amount of refrigerant in the gas state, but the refrigerant passing therethrough is not limited to the gas refrigerant. The indoor side liquid pipe C and the outdoor side liquid pipe D pass a large amount of liquid refrigerant, but the refrigerant passing therethrough is not limited to liquid refrigerant.

  The discharge pipe A connects the compressor 21 and the four-way switching valve 22. The discharge pipe A is provided with a discharge temperature sensor 29d for detecting the temperature of the refrigerant passing therethrough. Note that the power supply unit 21 e supplies power to the compressor 21. The amount of power supplied from the power supply unit 21e is detected by the compressor power detection unit 29f.

  The indoor side gas pipe B connects the four-way switching valve 22 and the indoor heat exchanger 41. In the middle of the indoor side gas pipe B, a pressure sensor 29a for detecting the pressure of the refrigerant passing therethrough is provided.

  The indoor side liquid pipe C connects the indoor heat exchanger 41 and the outdoor electric expansion valve 24.

  The outdoor liquid pipe D connects the outdoor electric expansion valve 24 and the outdoor heat exchanger 23.

  The outdoor gas pipe E connects the outdoor heat exchanger 23 and the four-way switching valve 22.

  The accumulator pipe F connects the four-way switching valve 22 and the accumulator 25, and extends in the vertical direction when the outdoor unit 2 is installed. An electromagnetic induction heating unit 6 is attached to a part of the accumulator tube F. Of the accumulator tube F, at least a heat generating portion whose periphery is covered by a coil 68, which will be described later, is constituted by a magnetic body tube F2 provided so as to cover the periphery of the copper tube F1 in which the refrigerant is flowing inside. (See FIG. 11). The magnetic tube F2 is made of SUS (Stainless Used Steel) 430. The SUS430 is a ferromagnetic material, and generates eddy currents when placed in a magnetic field, and generates heat due to Joule heat generated by its own electrical resistance. Portions other than the magnetic pipe F2 among the pipes constituting the refrigerant circuit 10 are made of copper pipes. In addition, the material of the pipe | tube covering the circumference | surroundings of the said copper pipe | tube is not limited to SUS430, For example, at least 2 or more types of metals chosen from conductors, such as iron, copper, aluminum, chromium, nickel, and these groups are used. It can be an alloy or the like. Examples of the magnetic material include three types of ferrite, martensite, and austenite, and combinations of these types, but are ferromagnetic and have a relatively high electrical resistance. A material having a Curie temperature higher than the operating temperature range is preferable. The accumulator tube F here requires more electric power, but does not have to include a magnetic body and a material containing the magnetic body, and contains a material to be subjected to induction heating. It may be a thing. For example, the magnetic material may constitute all of the accumulator pipe F, or may be formed only on the inner surface of the accumulator pipe F, and is contained in the material constituting the accumulator pipe F pipe. May exist. By performing electromagnetic induction heating in this manner, the accumulator tube F can be heated by electromagnetic induction, and the refrigerant sucked into the compressor 21 via the accumulator 25 can be warmed. Thereby, the heating capability of the air conditioning apparatus 1 can be improved. Further, for example, even when the compressor 21 is not sufficiently warmed at the time of starting the heating operation, the lack of capacity at the time of starting can be compensated for by the rapid heating by the electromagnetic induction heating unit 6. Further, when the four-way switching valve 22 is switched to the cooling operation state and the defrost operation is performed to remove the frost attached to the outdoor heat exchanger 23 or the like, the electromagnetic induction heating unit 6 quickly opens the accumulator tube F. By heating, the compressor 21 can compress the rapidly heated refrigerant as a target. For this reason, the temperature of the hot gas discharged from the compressor 21 can be raised rapidly. Thereby, the time required to thaw frost by defrost operation can be shortened. Thereby, even if it is necessary to perform a defrost operation in a timely manner during the heating operation, the operation can be returned to the heating operation as soon as possible, and the user's comfort can be improved.

  The suction pipe G connects the accumulator 25 and the suction side of the compressor 21.

  The hot gas bypass circuit H connects a branch point A1 provided in the middle of the discharge pipe A and a branch point D1 provided in the middle of the outdoor liquid pipe D. The hot gas bypass circuit 27 is provided with a hot gas bypass valve 27 that can switch between a state that allows passage of refrigerant and a state that does not allow passage of the refrigerant. In the hot gas bypass circuit H, a capillary tube 28 is provided between the hot gas bypass valve 27 and the branch point D1 to reduce the pressure of refrigerant passing therethrough. Since this capillary tube 28 can be brought close to the pressure after the refrigerant pressure is reduced by the outdoor electric expansion valve 24 during the heating operation, the chamber by the supply of hot gas to the outdoor liquid pipe D through the hot gas bypass circuit H is provided. An increase in the refrigerant pressure in the outer liquid pipe D can be suppressed.

  The branch pipe K constitutes a part of the outdoor heat exchanger 23, and a refrigerant pipe extending from the gas side inlet / outlet 23e of the outdoor heat exchanger 23 will be described later in order to increase the effective surface area for heat exchange. It is a pipe branched into a plurality of lines at a branching junction 23k. The branch pipe K includes a first branch pipe K1, a second branch pipe K2, and a third branch pipe K3 that extend independently from the branch junction point 23k to the junction branch point 23j. The pipes K1, K2, and K3 merge at the merge branch point 23j. Note that, when viewed from the merging pipe J side, the branch pipe K extends at a merging branch point 23j.

  The junction pipe J constitutes a part of the outdoor heat exchanger 23 and extends from the junction branch point 23j to the liquid side inlet / outlet 23d of the outdoor heat exchanger 23. The junction pipe J can unify the degree of supercooling of the refrigerant flowing out of the outdoor heat exchanger 23 during the cooling operation, and can defrost frosted ice near the lower end of the outdoor heat exchanger 23 during the heating operation. . The junction pipe J has a cross-sectional area that is approximately three times the cross-sectional area of each of the branch pipes K1, K2, and K3, and the amount of refrigerant passing through is approximately three times that of each of the branch pipes K1, K2, and K3. .

  The four-way switching valve 22 can switch between a cooling operation cycle and a heating operation cycle. In FIG. 1, the connection state when performing the heating operation is indicated by a solid line, and the connection state when performing the cooling operation is indicated by a dotted line. During the heating operation, the indoor heat exchanger 41 functions as a refrigerant cooler, and the outdoor heat exchanger 23 functions as a refrigerant heater. During the cooling operation, the outdoor heat exchanger 23 functions as a refrigerant cooler, and the indoor heat exchanger 41 functions as a refrigerant heater.

  The outdoor heat exchanger 23 includes a gas side inlet / outlet 23e, a liquid side inlet / outlet 23d, a branch junction 23k, a junction branch point 23j, a branch pipe K, a junction pipe J, and a heat exchange fin 23z. The gas side inlet / outlet 23 e is located at the end of the outdoor heat exchanger 23 on the outdoor gas pipe E side, and is connected to the outdoor gas pipe E. The liquid side inlet / outlet 23 d is located at the end of the outdoor heat exchanger 23 on the outdoor liquid pipe D side, and is connected to the outdoor liquid pipe D. The branch junction 23k branches a pipe extending from the gas side inlet / outlet port 23e, and can branch or join the refrigerant according to the direction of the flowing refrigerant. A plurality of branch pipes K extend from each branch portion at the branch junction 23k. The junction branch point 23j joins the branch pipe K and can join or branch the refrigerant according to the direction of the flowing refrigerant. The junction pipe J extends from the junction branch point 23j to the liquid side inlet / outlet 23d. The heat exchange fins 23z are configured by arranging a plurality of plate-like aluminum fins in the thickness direction and arranged at predetermined intervals. The branch pipe K and the merge pipe J both have the heat exchange fins 23z as a common penetration target. Specifically, the branch pipe K and the junction pipe J are disposed so as to penetrate in the plate pressure direction at different portions of the common heat exchange fin 23z. With respect to the outdoor heat exchanger 23, an outdoor air temperature sensor 29b for detecting the outdoor air temperature is provided on the leeward side of the outdoor fan 26 in the air flow direction. The outdoor heat exchanger 23 is provided with an outdoor heat exchange temperature sensor 29c that detects the temperature of the refrigerant flowing through the branch pipe air conditioner.

  In the indoor unit 4, an indoor temperature sensor 43 that detects the indoor temperature is provided. The indoor heat exchanger 41 is provided with an indoor heat exchanger temperature sensor 44 that detects the refrigerant temperature on the indoor liquid pipe C side to which the outdoor conductive expansion valve 24 is connected.

  The outdoor control unit 12 that controls the devices arranged in the outdoor unit 2 and the indoor control unit 13 that controls the devices arranged in the indoor unit 4 are connected by the communication line 11a, so that the control unit 11 is constituted. The control unit 11 performs various controls for the air conditioner 1.

  Further, the outdoor control unit 12 is provided with a timer 95 that counts elapsed time when performing various controls.

  Note that a controller 90 that accepts a setting input from the user is connected to the control unit 11.

<1-2> Outdoor unit 2
In FIG. 2, the external appearance perspective view of the front side of the outdoor unit 2 is shown. In FIG. 3, the perspective view about the positional relationship with the outdoor heat exchanger 23 and the outdoor fan 26 is shown. In FIG. 4, the perspective view of the back side of the outdoor heat exchanger 23 is shown.

  The outdoor unit 2 has an outer surface formed by a substantially rectangular parallelepiped outdoor unit casing that includes a top plate 2a, a bottom plate 2b, a front panel 2c, a left side panel 2d, a right side panel 2f, and a back panel 2e.

  In the outdoor unit 2, an outdoor heat exchanger 23, an outdoor fan 26, and the like are arranged, a blower room on the left side panel 2d side, a compressor 21 and an electromagnetic induction heating unit 6 are arranged, and the right side panel 2f side. The machine room is separated by a partition plate 2h. The outdoor unit 2 is fixed by being screwed to the bottom plate 2b, and has an outdoor unit support 2g that forms the lowermost end portion of the outdoor unit 2 on the right side and the left side. The electromagnetic induction heating unit 6 is disposed at an upper position in the vicinity of the left side panel 2d and the top plate 2a in the machine room. Here, the heat exchange fins 23z of the outdoor heat exchanger 23 described above are arranged side by side in the plate thickness direction so that the plate thickness direction is substantially horizontal. The joining pipe J is disposed in the lowermost portion of the heat exchange fins 23z of the outdoor heat exchanger 23 by penetrating the heat exchange fins 23z in the thickness direction. The hot gas bypass circuit H is arranged along the lower side of the outdoor fan 26 and the outdoor heat exchanger 23.

  FIG. 5 is an overall front perspective view showing the internal structure of the machine room of the outdoor unit 2. FIG. 6 is a perspective view showing the internal structure of the machine room of the outdoor unit 2. In FIG. 7, the perspective view about the arrangement | positioning relationship between the outdoor heat exchanger 23 and the baseplate 2b is shown. In FIG. 8, the top view about the arrangement | positioning relationship of the electromagnetic induction heating unit 6 is shown.

  The partition plate 2h of the outdoor unit 2 includes a fan room in which the outdoor heat exchanger 23 and the outdoor fan 26 are arranged, a machine room in which the electromagnetic induction heating unit 6, the compressor 21, the accumulator 25, and the like are arranged, Is partitioned from the upper end to the lower end from the front to the rear. The compressor 21 and the accumulator 25 are disposed in a space below the machine room of the outdoor unit 2. The electromagnetic induction heating unit 6, the four-way switching valve 22, and the outdoor control unit 12 are disposed in a space above the machine room of the outdoor unit 2 and above the compressor 21, the accumulator 25, and the like. . A compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an outdoor electric expansion valve 24, an accumulator 25, a hot gas bypass valve 27, a capillary, which are functional elements constituting the outdoor unit 2 and are disposed in the machine room The tube 28 and the electromagnetic induction heating unit 6 include a discharge pipe A, an indoor side gas pipe B, an outdoor side liquid pipe D, an outdoor side gas pipe E, an accumulator so as to execute the refrigeration cycle by the refrigerant circuit 10 shown in FIG. They are connected via a tube F, a hot gas bypass circuit H, and the like. Here, as will be described later, the hot gas bypass circuit H is configured by connecting nine parts of the first bypass part H1 to the ninth bypass part H9, and when the refrigerant flows into the hot gas bypass circuit H, , Flows in the direction from the first bypass portion H1 toward the ninth bypass portion H9 in order.

<1-3> Electromagnetic induction heating unit 6
FIG. 9 is a schematic perspective view of the electromagnetic induction heating unit 6 attached to the accumulator tube F. FIG. 10 shows an external perspective view of the electromagnetic induction heating unit 6 with the shielding cover 75 removed. FIG. 11 is a cross-sectional view of the electromagnetic induction heating unit 6 attached to the accumulator tube F.

  The electromagnetic induction heating unit 6 is arranged so as to cover the magnetic body tube F2 that is a heat generating portion of the accumulator tube F from the outside in the radial direction, and heats the magnetic body tube F2 by electromagnetic induction heating. The heat generating portion of the accumulator tube F has a double tube structure having an inner copper tube F1 and an outer magnetic tube F2.

  The electromagnetic induction heating unit 6 includes a first hexagon nut 61, a second hexagon nut 66, a first bobbin lid 63, a second bobbin lid 64, a bobbin body 65, a first ferrite case 71, a second ferrite case 72, and a third ferrite. A case 73, a fourth ferrite case 74, a first ferrite 98, a second ferrite 99, a coil 68, a shielding cover 75, the thermistor 14 and a fuse 15 are provided.

  The first hexagon nut 61 and the second hexagon nut 66 are made of resin, and stabilize the fixed state between the electromagnetic induction heating unit 6 and the accumulator pipe F using a C-shaped ring (not shown). The first bobbin lid 63 and the second bobbin lid 64 are made of resin and cover the accumulator tube F from the radially outer side at the upper end position and the lower end position, respectively. The first bobbin lid 63 and the second bobbin lid 64 have four screw holes for the screws 69 for screwing first to fourth ferrite cases 71 to 74 described later through the screws 69. ing. Further, the second bobbin lid 64 has an electromagnetic induction thermistor insertion opening 64f for inserting the thermistor 14 and attaching it to the outer surface of the magnetic tube F2. The second bobbin lid 64 has a fuse insertion opening 64e for inserting the fuse 15 shown in FIG. 13 and attaching it to the outer surface of the magnetic tube F2. The thermistor 14 transmits the detected temperature as a signal to the control unit 11. The fuse 15 transmits the detection result to the control unit 11 as a signal. Receiving the notification of temperature detection exceeding the predetermined limit temperature from the fuse 15, the control unit 11 performs control to stop the power supply to the coil 68 to avoid thermal damage of the device. The bobbin main body 65 is made of resin, and the coil 68 is wound around it. The coil 68 is wound spirally around the outside of the bobbin main body 65 with the direction in which the accumulator tube F extends as the axial direction. The coil 68 is connected to a control printed board 18 (not shown) and receives a high-frequency current. The output of the control printed circuit board is controlled by the control unit 11. As shown in FIG. 12, the thermistor 14 and the fuse 15 are attached in a state where the bobbin main body 65 and the second bobbin lid 64 are fitted together. Here, in the attached state of the thermistor 14, the plate spring 16 is pushed inward in the radial direction of the magnetic tube F 2, thereby maintaining a good pressure contact state with the outer surface of the magnetic tube F 2. Similarly, the attachment state of the fuse 15 is also pushed inward in the radial direction of the magnetic tube F2 by the leaf spring 17, so that a good pressure contact state with the outer surface of the magnetic tube F2 is maintained. Thus, since the thermistor 14 and the fuse 15 are kept in good contact with the outer surface of the accumulator tube F, the responsiveness is improved, and a sudden temperature change due to electromagnetic induction heating can be detected quickly. I have to. The first ferrite case 71 is sandwiched between the first bobbin lid 63 and the second bobbin lid 64 from the direction in which the accumulator tube F extends, and is fixed by screwing with screws 69. The first ferrite case 71 to the fourth ferrite case 74 contain a first ferrite 98 and a second ferrite 99 made of ferrite, which is a material having high magnetic permeability. As shown in the magnetic flux explanatory diagram of FIG. 13, the first ferrite 98 and the second ferrite 99 take in the magnetic field generated by the coil 68 to form a path for the magnetic flux, thereby preventing the magnetic field from leaking to the outside. . The shielding cover 75 is disposed on the outermost peripheral portion of the electromagnetic induction heating unit 6 and collects magnetic flux that cannot be drawn only by the first ferrite 98 and the second ferrite 99. Almost no leakage magnetic flux is generated on the outside of the shielding cover 75, and the location where the magnetic flux is generated can be determined.

(Ferrite case and ferrite)
The details of the ferrite case will be described below.

  FIG. 14 is a schematic perspective view of the first ferrite case 71 in which the first ferrite 98 and the second ferrite 99 are accommodated and fixed. FIG. 15 shows a structure in the vicinity of the screwed portion on the upper side of the first ferrite case 71. FIG. 16 shows a structure in the vicinity of the screwed portion on the lower side of the first ferrite case 71. Note that the first to fourth ferrite cases 71 to 74 all have the same shape.

  The first ferrite case 71 is made of resin, and has a function of sandwiching and fixing the first bobbin lid 63 and the second bobbin lid 64 from the direction in which the accumulator tube F extends, and the first ferrite 98 and the second ferrite. 99 has a function of accommodating and holding 99.

  The first ferrite case 71 includes a bottom surface portion 71j, a side surface portion 71h, a first lid screwing portion 71a, a first lid screwing hole 71b, a second lid screwing portion 71f, a second lid screwing hole 71g, and a shielding cover screw. It has a wearing part 71c and a shielding cover screwing hole 71d.

  The bottom surface portion 71 j constitutes the bottom surface of the first ferrite case 71. As will be described later, the first ferrite 98 and the second ferrite 99 are bonded to the bottom surface portion 71j. In a state where the bottom surface portion 71j is fixed to the electromagnetic induction heating unit 6, the bottom surface portion 71j is provided at a position where the surface faces the radial direction, and the longitudinal direction is provided along the direction in which the accumulator tube F extends. The bottom surface portion 71j is attached to any one of four symmetrically provided substantially linear sides among the radial outer edges of the first bobbin lid 63 and the second bobbin lid 64. As a result, the back surface side of the bottom surface portion 71j and the substantially linear sides of the first bobbin lid 63 and the second bobbin lid 64 are fixed in contact with each other. Thereby, the 1st ferrite case 71 has the structure where the movement to the circumferential direction was controlled.

  The side surface portion 71h has a surface extending in a direction away from the bottom surface portion 71j from both ends in a direction orthogonal to the longitudinal direction of the bottom surface portion 71j.

  The first lid screwing portion 71a is provided for screwing the first ferrite case 71 and the first bobbin lid 63, and is located away from the radially extending virtual space sandwiched between the two side surface portions 71h. Is provided. As a result, the first ferrite 98 can be disposed up to the vicinity of the magnetic tube F2, and leakage of magnetic force can be reduced.

  The second lid screwing portion 71f is provided for screwing the first ferrite case 71 and the second bobbin lid 64, and from the virtual space extending in the radial direction between the two side surfaces 71h, It is provided at a position shifted to the opposite side to the lid screwing portion 71a. As a result, the first ferrite 98 can be disposed up to the vicinity of the magnetic tube F2, and leakage of magnetic force can be reduced. The first lid screwing portion 71a and the second lid screwing portion 71f are arranged on one side and the other side with respect to a virtual space sandwiched between the two side surface portions 71h and extending in the radial direction. Therefore, not only the leakage of magnetic force is reduced, but also the first ferrite case 71 and the first bobbin lid 63 and the second bobbin lid 64 are more firmly fixed.

  The second lid screwing hole 71g screws and fixes the first ferrite case 71 and the second bobbin lid 64 to each other. Specifically, similarly to the first lid screwing hole 71b described above, the screw 69 made of metal is used for the second lid screwing hole 71g of the first ferrite case 71 and the screw 69 of the second bobbin lid 64. It fixes by screwing together with a screw hole (not shown).

  The shielding cover screwing portion 71c is formed to bulge toward the outer side opposite to the inner side where the side surface portions 71h face each other, and is provided at two locations on the upper side and two locations on the lower side.

  The shield cover screw holes 71d are openings provided in the shield cover screw portions 71c, and are screwed with screws in a state where the shield cover 75 is attached as shown in FIG. Thereby, the 1st ferrite case 71 and the shielding cover 75 are fixed. The shield cover screwing portion 71c and the shield cover screw hole 71d are also provided for the second to fourth ferrite cases 72 to 74. Of these, the shield cover 75 is actually fixed. In the present embodiment, the first ferrite case 71 and the third ferrite case 73 are provided.

  The first ferrite 98 and the second ferrite 99 housed in each ferrite case are disposed so as to be in contact with each other at the surface portions.

(Shielding cover)
Hereinafter, the details of the shielding cover 75 will be described.

  As shown in the top sectional view of FIG. 17, the shielding cover 75 has an outer edge shape in plan view when the first to fourth ferrite cases 71 to 74 are attached to the first bobbin lid 63 and the second bobbin lid 64. The sheet metal has a substantially octagonal shape and includes a magnetic material.

  As shown in the top view of FIG. 17, the shielding cover 75 has an overlapping portion 75 d in which one end 75 a and the other end 75 b in the circumferential direction overlap in the plate thickness maintaining direction. In this overlapping portion 75d, the surface in the vicinity of the one end 75a and the surface in the vicinity of the other end 75b are welded in a state of being in surface contact with each other from the top to the bottom in the direction in which the accumulator tube F extends. Thereby, when a magnetic field is generated by the electromagnetic induction heating unit 6, even if the shielding cover 75 sucks the leakage magnetic flux, there is no portion where the shielding covers 75 are partially in contact with each other. Therefore, local generation of eddy current can be prevented. Thereby, the heat generation of the shielding cover 75 constituting the outside of the electromagnetic induction heating unit 6 can be suppressed to be small, and can be kept low at a temperature in preparation for a danger touched by the user. Further, as can be seen from a comparison between FIG. 10 showing a state where the shielding cover 75 is not attached and FIG. 9 showing a state where the shielding cover 75 is attached, the shielding cover 75 provides access to the coil 68 such as a user's finger. The periphery of the coil 68 is covered so as to refuse. Here, since both ends of the coil 68 in the direction in which the accumulator tube F extends are arranged so as to be positioned between both ends of the shielding cover 75, the user can be effectively prevented from accessing the coil 68. is made of.

Further, the shape and dimensions of the shielding cover 75 also have a shape that shields the user's hand trying to approach the coil 68, so that the possibility that an operator or the like will come into contact with the coil can be reduced. Note that, when viewed from the radial direction of the coil 68, even when the opening and gap are provided in the shielding cover 75, the opening and gap are, for example, narrower than the cross-sectional area of the user's general fingertip. You may form so that it may become 1 cm < ² > or less.

  Further, as shown in FIG. 18, the shielding cover 75 is provided with screw holes 75x and 75y in the vicinity of the upper end in the longitudinal direction. As shown in FIG. 9, these screw holes function as holes through which screws 70 a and 70 b are passed when the shielding cover 75 is fixed to the first ferrite case 71.

  FIG. 19 is a cross-sectional view showing how the magnetic flux is guided with priority over the shielding cover 75 with respect to the ferrites 98 and 99.

  Since the ferrites 98 and 99 have higher magnetic permeability than the shielding cover 75 made of sheet metal, the magnetic flux that is about to leak is more easily guided to the ferrites 98 and 99 than the shielding cover 75. Further, here, the ferrites 98 and 99 accommodated in the ferrite case are arranged at positions closer to the coil 68 on the inner side than the shielding cover 75, and both ends of the shielding cover 75 in the longitudinal direction of the accumulator tube F. Instead, the ferrites 98 and 99 are arranged so as to protrude. Thereby, most of the magnetic flux to be leaked is guided to the ferrites 98 and 99, and the leakage magnetic flux that the shielding cover 75 performs corresponding processing can be suppressed to be small. Thereby, the amount of leakage magnetic flux generated outside the shielding cover 75 of the electromagnetic induction heating unit 6 can be reduced.

  Further, since the first ferrite case 71 is made of resin, even if the shielding cover 75 is screwed to the first ferrite case 71 by metal screws 70a and 70b, the first ferrite 98 and The second ferrite 99 and the shielding cover 75 are not in direct contact. For this reason, an arrangement structure is employed in which the first ferrite 98 and the second ferrite 99 and the shielding cover 75 do not come into contact with each other, so that naturally the first ferrite 98 and the second ferrite 99 and the shielding cover 75 are locally disposed. There is no significant contact area. For this reason, even if a current is passed through the coil 68 for electromagnetic induction, the concentration of magnetic flux due to the presence of contact portions between the first ferrite 98 and the second ferrite 99 and the shielding cover 75 hardly occurs. Thereby, the partial temperature rise resulting from the concentration of magnetic flux can be suppressed.

  Moreover, the ferrite of the 2nd-4th ferrite cases 72-74 covered from the radial direction outer side by the shielding cover 75 in positions other than the clearance part of the shielding cover 75, and the 2nd-4th ferrite cases 72-74 and the 2nd-2nd ferrite cases With the first ferrite 98 and the second ferrite 99 housed in the fourth ferrite cases 72 to 74, a double structure that suppresses leakage of magnetic flux can be adopted. Thereby, leakage of magnetic flux can be suppressed more efficiently.

  As shown in FIG. 8, the shielding cover 75 has a portion located near the right side panel 2f of the outdoor unit 2 when viewed from above, while being parallel to the right side panel 2f. It arrange | positions ensuring between the panels 2f. As a result, the magnetic flux guided to the shielding cover 75 is further guided to the right side panel 2f, or an eddy current is generated at a local contact portion between the right side panel 2f and the shielding cover 75, resulting in local localization. This prevents the generation of excessive heat.

(Protrusion member)
As shown in FIGS. 5, 6, and 9, the electromagnetic induction heating unit 6 has a protruding member 93 that is a sheet metal welded above the outside of the shielding cover 75.

  The protruding member 93 extends from the outside of the shielding cover 75 to a space above the four-way switching valve 22 and to a space between the accumulator pipe F and the indoor side gas pipe B. And the front end side of this projection member 93 is not in contact with any of the four-way switching valve 22, the accumulator pipe F, and the indoor side gas pipe B in the state where the electromagnetic induction heating unit 6 is installed. For this reason, noise is not generated by the projection member 93 and other members around it due to vibration or the like. The fixed state of the electromagnetic induction heating unit 6 becomes unstable due to some vibration or a change such as thermal expansion of the accumulator tube F, and the accumulator tube F rotates around the shaft, or along the accumulator tube F. It may happen that it falls.

  However, since the protrusion member 93 is provided, the rotation is restricted by the protrusion member 93 coming into contact with the accumulation pipe F or the indoor side gas pipe B. And about the fall, in the state which the projection member 93 contact | abutted above the four-way switching valve 22, the fall of the electromagnetic induction heating unit 6 can be stopped. Even in the state where the fall of the electromagnetic induction heating unit 6 is held by the upper part of the four-way switching valve 22 as described above, the coil 68 can still exist around the magnetic pipe F2 of the accumulator pipe F. I have to. As a result, even if the electromagnetic induction heating unit 6 is slightly dropped, the heating of the accumulation tube F by the electromagnetic induction heating can be continued.

<Characteristics of the air conditioner 1 of the present embodiment>
In the electromagnetic induction heating unit 6 of the air conditioner 1, a shielding cover 75 including a magnetic material is disposed at a position opposite to the accumulator tube F side with respect to the coil 68. For this reason, the magnetic flux generated in portions other than the accumulator tube F is likely to pass through the shielding cover 75. Furthermore, since this shielding cover 75 goes around the accumulator tube F in the circumferential direction, local eddy currents hardly occur and local heat generation can be suppressed.

  In addition, since ferrites 98 and 99 that collect magnetic flux more strongly are disposed between the shielding cover 75 and the coil 68, the burden on the shielding cover 75 for preventing leakage magnetic flux can be kept small. . With such a double magnetic flux leakage prevention structure, leakage of the magnetic field can be effectively suppressed.

<Other embodiments>
As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, the case where the both ends 75a and 75b of the circumferential direction of the shielding cover 75 were welded was mentioned as an example, and was demonstrated.

  However, the present invention is not limited to this.

  As shown in FIG. 20, for example, a cylindrical member integrally formed like the shielding cover 175 may be formed without providing a welded portion like the shielding cover 75 of the above embodiment. Even in this case, since the shielding cover 175 is continuous in the circumferential direction of the accumulator tube F and local eddy currents are prevented from being generated, the same effects as those of the above embodiment can be achieved. become.

(B)
In the above embodiment, the case where the electromagnetic induction heating unit 6 is attached to the accumulator tube F in the refrigerant circuit 10 has been described.

  However, the present invention is not limited to this.

  For example, other refrigerant pipes other than the accumulator pipe F may be provided. In this case, a magnetic material such as the magnetic material tube F2 is provided in the refrigerant piping portion where the electromagnetic induction heating unit 6 is provided.

(C)
In the said embodiment, the case where the accumulation pipe F was comprised as a double pipe | tube of the copper pipe F1 and the magnetic body pipe | tube F2 was mentioned and demonstrated.

  However, the present invention is not limited to this.

  As shown in FIG. 21, for example, the member to be heated F2a and the two stoppers F1a may be arranged inside the accumulator pipe F or the refrigerant pipe to be heated. Here, the member to be heated F2a is a member that contains a magnetic material and generates heat by electromagnetic induction heating in the above embodiment. The stopper F1a always allows passage of the refrigerant at two locations inside the copper tube F1, but does not allow passage of the heated member F2a. Thereby, the to-be-heated member F2a does not move even if the refrigerant flows. For this reason, the target heating position of the accumulator tube F or the like can be heated. Furthermore, since the to-be-heated member F2a and the refrigerant are in direct contact with each other, the heat transfer efficiency can be improved.

(D)
The heated member F2a described in the other embodiment (C) may be positioned with respect to the pipe without using the stopper F1a.

  As shown in FIG. 22, for example, the copper pipe F1 may be provided with two bent portions FW, and the heated member F2a may be disposed inside the copper pipe F1 between the two bent portions FW. Even if it does in this way, the movement of the to-be-heated member F2a can be suppressed, allowing a refrigerant to pass through.

(E)
In the above embodiment, the case where the coil 68 is spirally wound around the accumulator tube F has been described.

  However, the present invention is not limited to this.

  For example, as shown in FIG. 23, the coil 168 wound around the bobbin main body 165 may be arranged around the accumulator tube F without being wound around the accumulator tube F. Here, the bobbin main body 165 is disposed so that the axial direction is substantially perpendicular to the axial direction of the accumulator tube F. Further, the bobbin main body 165 and the coil 168 are arranged separately in two so as to sandwich the accumulator tube F.

  In this case, for example, as shown in FIG. 24, the first bobbin lid 163 and the second bobbin lid 164 passing through the accumulator tube F may be arranged in a state of being fitted to the bobbin main body 165. Good.

  Furthermore, as shown in FIG. 25, the first bobbin lid 163 and the second bobbin lid 164 may be sandwiched and fixed between the first ferrite case 171 and the second ferrite case 172. In FIG. 25, the case where two ferrite cases are arranged so as to sandwich the accumulator tube F is taken as an example, but may be arranged in four directions as in the above embodiment. Moreover, you may contain the ferrite like the said embodiment.

  And the shielding cover 75 may be provided so that the outermost periphery part of the electromagnetic induction heating unit 6 fixed in this way may be covered.

<Others>
The embodiments of the present invention have been described above with some examples, but the present invention is not limited to these. For example, combined embodiments obtained by appropriately combining different portions of the above-described embodiments within the scope that can be implemented by those skilled in the art from the above description are also included in the present invention.

  If the present invention is used, even if the refrigerant pipe is heated by electromagnetic induction, it is possible to suppress leakage of the magnetic field to the surroundings while suppressing local heat generation, so that the refrigerant is heated using electromagnetic induction. It is particularly useful in an electromagnetic induction heating unit and an air conditioner.

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 6 Electromagnetic induction heating unit 10 Refrigerant circuit 14 Thermistor 15 Fuse 21 Compressor 22 Four-way switching valve 23 Outdoor heat exchanger 24 Electric expansion valve 25 Accumulator 41 Indoor heat exchanger 65 Bobbin main body 68 Coil 71-74 1st Ferrite case to 4th ferrite case 75 Shielding cover 98, 99 1st ferrite, 2nd ferrite F Accumulation tube, refrigerant piping

JP-A-8-210720

Claims (14)

An electromagnetic induction heating unit (6) for heating a refrigerant pipe (F) and / or a member in thermal contact with the refrigerant flowing in the refrigerant pipe (F),
A coil (68) disposed in the vicinity of the refrigerant pipe (F);
An external member (75, 175) that is disposed on the outside of the coil (68) opposite to the inside that is on the side of the refrigerant pipe (F) and includes a magnetic material;
A magnetic part (98, 99) including at least a part disposed outside the coil (68) and inside the external member (75);
Equipped with a,
The external member (75) is provided to be continuous in the circumferential direction with respect to the refrigerant pipe (F), and the magnetic body portions (98, 99) are provided in the circumferential direction with respect to the refrigerant pipe (F). It is provided not to be continuous,
Electromagnetic induction heating unit (6). The magnetic part ( 98, 99) contains ferrite,
The electromagnetic induction heating unit (6) according to claim 1 .   The magnetic part (98, 99) is configured to contain ferrite, and
  The external member (75) is composed of a sheet metal having a lower magnetic permeability than the magnetic body portions (98, 99).
The electromagnetic induction heating unit (6) according to claim 1. The coil (68) surrounds at least a part of the refrigerant pipe (F).
The electromagnetic induction heating unit (6) according to any one of claims 1 to 3 . The external member (75) has a connection part by welding in at least one part in the circumferential direction.
The electromagnetic induction heating unit (6) according to any one of claims 1 to 4 . The external member (75) and the magnetic body part ( 98, 99) are obtained when the refrigerant pipe (F) is viewed from the outside on a plane perpendicular to the direction in which the refrigerant pipe (F) extends. , Having portions arranged at positions overlapping each other,
The electromagnetic induction heating unit (6) according to any one of claims 1 to 5 . In the direction in which the refrigerant pipe (F) extends, both end portions of the external member (75) are located on the inner side than both end portions of the magnetic body portions ( 98, 99).
The electromagnetic induction heating unit (6) according to any one of claims 1 to 6. The material of the magnetic part ( 98, 99) is a material that collects magnetic flux more easily than the external member (75).
The electromagnetic induction heating unit (6) according to claim 7. The magnetic part ( 98, 99) and the external member (75) are positioned so that there is no part that directly contacts,
The electromagnetic induction heating unit (6) according to any one of claims 1 to 8. Electromagnetic induction heating unit (6) according to any one of claims 1 to 9,
A refrigeration cycle (10) including a portion for flowing a refrigerant through the refrigerant pipe (F);
An air conditioner (1) comprising: An electromagnetic induction heating unit (6) for heating a refrigerant pipe (F) and / or a member that is in thermal contact with the refrigerant flowing in the refrigerant pipe (F), and is disposed in the vicinity of the refrigerant pipe (F). The coil (68) and the coil (68) are arranged on the outer side opposite to the inner side on the refrigerant pipe (F) side, and the refrigerant pipe (F) makes a round in the circumferential direction. An external member (75 , 175) including a body, and a protruding member (93) having a portion fixed to the external member (75) and extending toward the outside of the external member (75) An electromagnetic induction heating unit (6) having:
A refrigeration cycle (10) including a portion for flowing a refrigerant through the refrigerant pipe (F);
A member to be contacted (22) disposed outside the external member (75) and holding at least the fall of the electromagnetic induction heating unit (6) in contact with the protruding member (93) ;
With
The protruding member (93) and the contacted member (22) are in contact with each other while the electromagnetic induction heating unit (6) is kept from dropping, and before the electromagnetic induction heating unit (6) starts to fall. It is arranged so that there is no part to touch in the state,
Air conditioner (1). An electromagnetic induction heating unit (6) for heating a refrigerant pipe (F) and / or a member that is in thermal contact with the refrigerant flowing in the refrigerant pipe (F), and is disposed in the vicinity of the refrigerant pipe (F). The coil (68) and the coil (68) are arranged on the outer side opposite to the inner side on the refrigerant pipe (F) side, and the refrigerant pipe (F) makes a round in the circumferential direction. An external member (75 , 175) including a body, and a protruding member (93) having a portion fixed to the external member (75) and extending toward the outside of the external member (75) An electromagnetic induction heating unit (6) having:
A refrigeration cycle (10) including a portion for flowing a refrigerant through the refrigerant pipe (F);
A member to be contacted (B, F) which is disposed outside the external member (75) and prevents rotation of at least the electromagnetic induction heating unit (6) in a state of being in contact with the protruding member (93) ;
With
The protruding member (93) and the contacted member (B, F) are in contact with each other while the electromagnetic induction heating unit (6) is kept rotating, and the electromagnetic induction heating unit (6) starts to rotate. Arranged so that there is no contact part in the previous state,
Air conditioner (1). An electromagnetic induction heating unit (6) for heating a refrigerant pipe (F) and / or a member that is in thermal contact with the refrigerant flowing in the refrigerant pipe (F), and is disposed in the vicinity of the refrigerant pipe (F). The coil (68) and the coil (68) are arranged on the outer side opposite to the inner side on the refrigerant pipe (F) side, and the refrigerant pipe (F) makes a round in the circumferential direction. An external member (75 , 175) including a body, and a protruding member (93) having a portion fixed to the external member (75) and extending toward the outside of the external member (75) An electromagnetic induction heating unit (6) having:
A refrigeration cycle (10) including a portion for flowing a refrigerant through the refrigerant pipe (F);
A contact fall prevention member (22) disposed outside the external member (75) and preventing at least the electromagnetic induction heating unit (6) from dropping in a state of being in contact with the projecting member (93);
Contacted anti-rotation members (B, F) that are disposed outside the external member (75) and prevent rotation of at least the electromagnetic induction heating unit (6) in contact with the protruding member (93). ,
With
The protruding member (93) and the contacted fall prevention member (22) are in contact with each other while the electromagnetic induction heating unit (6) is kept falling, and the electromagnetic induction heating unit (6) starts to fall. In the previous state, it is arranged so that there is no contact part,
The protruding member (93) and the contacted rotation prevention member (B, F) are in contact with each other while the rotation of the electromagnetic induction heating unit (6) is stopped, and the electromagnetic induction heating unit (6) rotates. It is arranged so that there is no contact part in the state before starting to do,
Air conditioner (1). The electromagnetic induction heating unit (6) has a fixing member (a member for applying a force radially inward from the outer periphery of the refrigerant pipe (F) in order to determine a relative position to the refrigerant pipe (F). 61, 62),
The fixing member (61, 62) has a coefficient of thermal expansion different from that of the refrigerant pipe (F),
The refrigerant pipe (F) is thermally expanded by a magnetic field generated when electric power is supplied to the coil (68).
The air conditioner (1) according to any one of claims 11 to 13.

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