WO2010079570A1 - Electromagnetic induction heating unit and air conditioning device - Google Patents

Abstract

Provided are an electromagnetic induction heating unit and an air conditioning device, wherein even if electromagnetic induction heating is performed by generating a magnetic field using an electromagnetic induction heating unit, the magnetic field leaking to the outside of a refrigerant pipe can be reduced.  An electromagnetic induction heating unit (6) for electromagnetic induction-heating a refrigerant pipe (F) is comprised of a coil (68), a shielding cover (75), and ferrites (98, 99).  The coil (68) is disposed in the vicinity of the refrigerant pipe (F).  The shielding cover (75) is arranged around the refrigerant pipe (F), and contains a magnetic substance.  The ferrites (98, 99) are disposed on the outer side of the coil (68), which is opposite to the inner side of the coil (68) adjacent to the refrigerant pipe (F), and on the inner side of the shielding cover (75), and contain a magnetic substance having a magnetic permeability higher than that of the shielding cover (75).  In a direction in which the refrigerant pipe (F) extends, the opposed ends of the shielding cover (75) are disposed at a position further inside than the opposed ends of the ferrites (98, 99).

Description

Electromagnetic induction heating unit and air conditioner

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 Application Laid-Open No. 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 a magnetic field is generated when the refrigerant pipe is heated by electromagnetic induction, a magnetic field is generated not only in the refrigerant pipe but also in other portions.
On the other hand, it is conceivable to arrange a member having a material that easily takes in magnetic flux around the refrigerant pipe, but it is still difficult to sufficiently suppress leakage of the magnetic field.

The present invention has been made in view of the above-described points, and an object of the present invention is to leak into a portion other than the refrigerant pipe even when electromagnetic induction heating is performed by generating a magnetic field by an electromagnetic induction heating unit. An object of the present invention is to provide an electromagnetic induction heating unit and an air conditioner that can suppress a magnetic field to be small.

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 a refrigerant flowing in the refrigerant pipe, and includes a coil, an external member, and a magnetic part. It has. The coil is disposed in the vicinity of the refrigerant pipe. The external member is disposed around the refrigerant pipe and includes a magnetic body. The magnetic body portion is disposed on the outer side opposite to the inner side on the refrigerant piping side of the coil and on the inner side of the external member, and includes a magnetic material having a higher magnetic permeability than the external member. In the direction in which the refrigerant pipe extends, both end portions of the external member are positioned inside the both end portions of the magnetic body portion. 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 It includes at least a case where the member is heated by electromagnetic induction and a case where the heat generating member constituting at least a part of the refrigerant pipe is heated by electromagnetic induction.

In the case of electromagnetic induction heating, a magnetic field may be generated not only for the purpose of generating heat but also for the surroundings.
On the other hand, in this electromagnetic induction heating unit, since the magnetic body part including the magnetic material having higher permeability than the external member is arranged outside the coil, the magnetic field generated in the part other than the refrigerant pipe is The magnetic material portion is preferentially passed over the external member. Furthermore, in the direction in which the refrigerant pipe extends, the both end portions of the external member are positioned on the inner side of the both end portions of the magnetic body portion, so that the magnetic flux that leaks to the portion other than the refrigerant pipe is more than the external member. It can be captured more efficiently. Thereby, when performing electromagnetic induction heating, since the magnetic field generated in a portion other than the refrigerant pipe can be efficiently passed through the magnetic body portion, it leaks to a portion other than the magnetic body portion outside the magnetic body portion. The degree can be kept small.

The electromagnetic induction heating unit of the second invention is the electromagnetic induction heating unit of the first invention, wherein the coil surrounds at least a part of 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 third aspect of the present invention is the electromagnetic induction heating unit according to the first or second aspect, wherein at least a part of the magnetic body portion is relative to one side of the coil and the coil in the direction in which the refrigerant pipe extends. It extends to at least one of the other side opposite to the one side.
In this electromagnetic induction heating unit, the magnetic body portion can take in the magnetic flux that is generated by supplying power to the coil and that leaks to the side opposite to the refrigerant pipe before being guided to the external member. For this reason, the magnetic body portion can suppress more magnetic field leakage than the external member. This not only reduces the magnetic field leakage outside the magnetic body part, but also captures the magnetic field that the external member leaks outside the magnetic body part, thereby more effectively preventing the magnetic field leakage outside the external member. Can be reduced.

The electromagnetic induction heating unit according to a fourth aspect of the present invention is the electromagnetic induction heating unit according to any one of the first to third aspects of the invention, wherein at least a part of the magnetic body portion is outside the refrigerant pipe as viewed in the axial direction of the refrigerant pipe. Extending to the inside of the coil.
In this electromagnetic induction heating unit, it is possible to more efficiently pass the magnetic body part by suppressing the extent to which the magnetic field generated by the coil leaks to a part other than the magnetic body part.

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 magnetic part has a plurality of magnetic parts arranged in contact with each other. .
In this electromagnetic induction heating unit, the magnetic body portion is not formed as an integral member along the target shape, but a plurality of parts can be combined into the target shape. And since these magnetic body components are arrange | positioned in the state which mutually contacted, the fall of the magnetic permeability in the connection part of a magnetic body component can be restrained small.

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 present invention, wherein the magnetic part includes a good conductor material.
In this electromagnetic induction heating unit, even when a magnetic flux is passed through the magnetic body portion in order to keep the magnetic field lines outside the magnetic body portion small, the magnetic body portion contains a good conductor material. Heat can be kept small.

An 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 invention, wherein the magnetic body portion includes ferrite.
In this electromagnetic induction heating unit, the magnetic flux can be allowed to actively pass through the magnetic body portion containing ferrite, and the magnetic field leaking outside the magnetic body portion can be kept small.

An air conditioner according to an eighth aspect includes the electromagnetic induction heating unit according to any one of the first aspect to the seventh aspect, and a refrigeration cycle including a portion for flowing a refrigerant through a refrigerant pipe.
In this air conditioner, even when electromagnetic induction heating is performed in the air conditioner, the influence on the surroundings of the electromagnetic induction heating unit can be reduced.

In the electromagnetic induction heating unit according to the first aspect of the invention, it is possible to reduce the degree of leakage to a portion other than the magnetic body portion outside the magnetic body portion.
In the electromagnetic induction heating unit of the second invention, the heating efficiency by electromagnetic induction can be improved.
In the electromagnetic induction heating unit according to the third aspect of the invention, not only the magnetic field leakage outside the magnetic body portion is reduced, but also the external member captures the magnetic field leaking outside the magnetic body portion, thereby Magnetic field leakage can be reduced more effectively.
In the electromagnetic induction heating unit of the fourth aspect of the invention, the magnetic part can be passed more efficiently.
In the electromagnetic induction heating unit according to the fifth aspect of the present invention, it is possible to suppress a decrease in the magnetic permeability at the connection part of the magnetic parts.

In the electromagnetic induction heating unit according to the sixth aspect of the invention, the Joule heat generated by the electrical resistance can be kept small.
In the electromagnetic induction heating unit according to the seventh aspect of the invention, the magnetic field that leaks outside the magnetic body portion can be kept small.
In the air conditioner according to the eighth aspect of the invention, even when electromagnetic induction heating is performed in the air conditioner, the influence on the surroundings of the electromagnetic induction heating unit can be reduced.

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 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 is not limited to SUS430, For example, a kind of conductor chosen from the group which consists of iron, copper, aluminum, chromium, and nickel, and from this group An alloy containing at least two selected metals can be used. Examples of SUS include two types of ferrite and martensite and combinations of these types. A material that is ferromagnetic and has a relatively high electrical resistance and 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 tube F, or may be formed only on the inner surface of the accumulator tube F, and is contained in the material constituting the accumulator tube F. 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 for defrosting 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. In the hot gas bypass circuit H, a hot gas bypass valve 27 capable of switching between a state allowing the passage of the refrigerant and a state not allowing the refrigerant is arranged in the middle. 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 heating operation, the capillary tube 28 is a chamber by supplying hot gas to the outdoor liquid pipe D through the hot gas bypass circuit H. 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 K.

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 electric 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 disposed so as to cover the magnetic tube F2 that is a heat generating portion of the accumulator tube F from the outside in the radial direction, and causes the magnetic tube F2 to generate heat 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 hex nut 61 and the second hex nut 66 are made of resin, and stabilize the fixed state between the electromagnetic induction heating unit 6 and the accumulator tube 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 screws 69 for screwing first to fourth ferrite cases 71 to 74, which will be 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 pressed by the leaf spring 17 inward in the radial direction of the magnetic tube F2, 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 the first ferrite 98 and the 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 outside 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 screw portion 71c and the shield cover screw hole 71d are also provided for the second to fourth ferrite cases 72 to 74, but 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.
The ferrites 98 and 99 guide the magnetic field by combining two types of shapes of the first ferrite 98 and the second ferrite 99. Costs can be kept low by using ferrites of the same shape in combination as described above, instead of using ferrite integrally molded in a U shape. 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 75d in which one end 75a and the other end 75b in the circumferential direction overlap in the plate thickness 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, 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.
The ferrites 98 and 99 have higher magnetic permeability than the shielding cover 75 made of sheet metal, and are arranged so as to extend in the radial direction at the upper and lower ends of the coil 68, when viewed from the direction in which the accumulator tube F extends. Are arranged so as to straddle the coil 68. Therefore, the magnetic flux that is about to leak is more easily guided to the ferrites 98 and 99 than the shielding cover 75, and the magnetic flux generated by the coil 68 is collected by the ferrites 98 and 99 before being collected by the shielding cover 75. Most of the magnetic flux can be guided to the ferrites 98 and 99. Further, the burden of preventing leakage of the magnetic field applied to the shielding cover 75 can be reduced, and the magnetic field leaking from the electromagnetic induction heating unit 6 can be further 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. As described above, since an arrangement structure is employed in which the first ferrite 98 and the second ferrite 99 do not come into contact with the shielding cover 75, naturally, the first ferrite 98, the second ferrite 99 and the shielding cover 75 are locally disposed. There is no specific 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, generation | occurrence | production of the partial temperature rise resulting from concentration of magnetic flux can be suppressed.

Further, the ferrites of the second to fourth ferrite cases 72 to 74 covered from the outside in the radial direction by the shielding cover 75 at positions other than the gap portion of the shielding cover 75 are the same as the shielding cover 75 containing the magnetic material and the second to fourth 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, the 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.

<Characteristics of the air conditioner 1 of the present embodiment>
In the case of electromagnetic induction heating, a magnetic field may be generated not only for the purpose of generating heat but also for the surroundings.
On the other hand, in the electromagnetic induction heating unit 6 of the air conditioning apparatus 1, the ferrites 98 and 99 containing a magnetic material having a higher magnetic permeability than the shielding cover 75 are disposed outside the coil 68. The ferrites 98 and 99 are arranged so as to extend closer to the coil 68 than 75. For this reason, the magnetic field generated in the portion other than the accumulator tube F passes through the ferrites 98 and 99 preferentially over the shielding cover 75. For this reason, the magnetic flux which the ferrite 98 and 99 tends to leak to parts other than the accumulation tube F can be caught efficiently. As a result, when electromagnetic induction heating is performed, the magnetic field generated in the portion other than the accumulator tube F can be efficiently passed through the ferrites 98 and 99, and the magnetic flux not collected by the ferrites 98 and 99 is also shielded. Collected by 75. For this reason, the magnetic flux which leaks to parts other than the electromagnetic induction heating unit 6 can be suppressed small.

<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 above embodiment, the case where the ferrites 98 and 99 guide the magnetic flux has been described as an example.
However, the present invention is not limited to this.
For example, the material for guiding the magnetic flux may be a good conductor material that does not have magnetism as much as ferrite. In this case, Joule heat generated by electric resistance when a magnetic field is guided can be suppressed to a small value.

(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. 20, 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 illustrated in FIG. 21, 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. 22, 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. 23, even if the first bobbin lid 163 and the second bobbin lid 164 passing through the accumulator tube F are disposed in a state of being fitted to the bobbin main body 165. Good.
Furthermore, as shown in FIG. 24, the first bobbin lid 163 and the second bobbin lid 164 may be sandwiched and fixed by the first ferrite case 171 and the second ferrite case 172. In FIG. 24, 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 accommodate the ferrite similarly to 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 (8)

1. 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) disposed around the refrigerant pipe (F) and containing a magnetic material;
   The coil (68) is disposed on the outer side opposite to the inner side on the refrigerant pipe (F) side and on the inner side of the outer member (75, 175), and has a magnetic permeability higher than that of the outer member. A magnetic part (98, 99) containing body material;
   With
   In the extending direction of the refrigerant pipe (F), 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).
   Electromagnetic induction heating unit (6).
2. The coil (68) surrounds at least a part of the refrigerant pipe (F).
   The electromagnetic induction heating unit (6) according to claim 1.
3. At least a part of the magnetic part (98, 99) is opposite to the one side of the coil (68) and the one side with respect to the coil (68) in the direction in which the refrigerant pipe (F) extends. Extending to at least one of the other side,
   The electromagnetic induction heating unit (6) according to claim 1 or 2.
4. At least a part of the magnetic part (98, 99) extends to the outside of the refrigerant pipe (F) and the inside of the coil (68) in the axial view of the refrigerant pipe.
   The electromagnetic induction heating unit (6) according to any one of claims 1 to 3.
5. The magnetic part (98, 99) has a plurality of magnetic parts (98, 99) arranged in contact with each other.
   The electromagnetic induction heating unit (6) according to any one of claims 1 to 4.
6. The magnetic part (98, 99) includes a good conductor material,
   The electromagnetic induction heating unit (6) according to any one of claims 1 to 5.
7. The magnetic part (98, 99) contains ferrite,
   The electromagnetic induction heating unit (6) according to any one of claims 1 to 6.
8. Electromagnetic induction heating unit (6) according to any one of claims 1 to 7,
   A refrigeration cycle (10) including a portion for flowing a refrigerant through the refrigerant pipe (F);
   An air conditioner (1) comprising:

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