Electric heater, air conditioner indoor unit and air conditioner

Abstract

The invention provides an electric heater, an air conditioner indoor unit and an air conditioner, the electric heater comprises a heating core tube and a fin structure, a plurality of cooling fins of the fin structure are arranged on the first tube wall surface of the heating core tube side by side in the length direction of the heating core tube, and the electric heater further comprises first auxiliary fins; the first auxiliary fins extend in the length direction of the heating core tube and are connected with the multiple cooling fins of the set of fin structures, and the first auxiliary fins are obliquely arranged in a straight face mode relative to the first tube wall face. Or, the electric heater further comprises two second auxiliary fins, the two second auxiliary fins are connected to the first side faces and the second side faces of the multiple heat dissipation fins of one set of fin structure in the width direction of the heating core pipe respectively, and the second auxiliary fins are arranged in a straight face inclined mode relative to the first pipe wall face. The electric heater can prevent condensate water from dripping from the surface of the electric heater, the structural strength of the electric heater is enhanced, the heating effect of the electric heater is improved, and the service life of the electric heater is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an electric heater, an air conditioner indoor unit having the electric heater, and an air conditioner having the air conditioner indoor unit. Background Art

[0002] As a safe and reliable heating method, electric heaters have been widely used in home appliances such as heaters, air conditioners, and dryers.

[0003] See also Figure 1 The existing electric heater 10 includes a heating core tube 111 and two groups of heat dissipation fin structures. The two groups of heat dissipation fin structures are symmetrically arranged on the tube walls at both ends of the heating core tube 111. A plurality of heat dissipation fins 112 of each group of heat dissipation fin structures are arranged side by side at equal intervals in the length direction of the heating core tube 111, and the heat dissipation fins 112 are arranged to be straight and inclined relative to the heating core tube 111.

[0004] When the above-mentioned existing electric heater 10 is used in the indoor unit of the air conditioner, the above-mentioned existing electric heater 10 is set in the casing of the indoor unit of the air conditioner and is located on the air outlet side of the indoor evaporator. During the cooling process of the air conditioner, the air temperature on the air outlet side of the indoor evaporator is relatively low, which causes condensation to easily form on the surface of the heat dissipation fins 112 of the above-mentioned existing electric heater 10 close to the air outlet side of the indoor evaporator. The condensation will be blown down onto the cross-flow fan frame and the air outlet duct along the heat dissipation fins 112 arranged obliquely on the straight surface, causing the condensation to flow to the air guide plate and drip, and even be blown into the room by the fan, which not only affects the heat exchange effect of the air conditioner and the user experience, but may also cause electrical failures and safety hazards. Summary of the invention

[0005] The first object of the present invention is to provide an electric heater that can prevent condensed water from dripping from the surface of the electric heater, so as to prevent condensed water on the surface of the electric heater from dripping onto the flow skeleton and the air outlet duct, thereby reducing or even avoiding the negative impact of condensation on the indoor unit of the air conditioner, so as to ensure the safe and stable operation of the air conditioner, thereby improving the heat exchange effect of the air conditioner and the user experience, and enhancing the structural strength of the electric heater to prevent the electric heater from deforming during the disassembly and use stages, thereby improving the heating effect and service life of the electric heater.

[0006] A second object of the present invention is to provide an air conditioner indoor unit with the above electric heater.

[0007] A third object of the present invention is to provide an air conditioner having the above-mentioned air conditioner indoor unit.

[0008] In order to achieve the first object of the present invention, the present invention provides an electric heater, comprising a heating core tube and at least one group of fin structures, wherein a plurality of heat dissipating fins of a group of fin structures are arranged side by side on a first tube wall surface of the heating core tube in the length direction of the heating core tube, and the electric heater also comprises at least one first auxiliary fin, wherein a first auxiliary fin extends in the length direction of the heating core tube and is connected to a plurality of heat dissipating fins of a group of fin structures, and a root end of the first auxiliary fin is connected to the first tube wall surface, an extended end of the first auxiliary fin is connected to a free end of the heat dissipating fin away from the heating core tube, a root end of the first auxiliary fin is arranged close to a first side surface of the heat dissipating fin, and a first The protruding end of the auxiliary fin is arranged close to the second side surface of the heat dissipation fin, and the first side surface and the second side surface are arranged opposite to each other in the width direction of the heat core tube, so that the first auxiliary fin is arranged to be inclined in a straight face relative to the first tube wall surface; or, the electric heater also includes at least two second auxiliary fins, and the two second auxiliary fins are respectively connected to the first side surface and the second side surface of a plurality of heat dissipation fins of a group of fin structures in the width direction of the heat core tube, the root end of each second auxiliary fin is connected to the first tube wall surface, and the protruding end of each second auxiliary fin is connected to the free end of the heat dissipation fin away from the heat core tube, and the second auxiliary fins are arranged to be inclined in a straight face relative to the first tube wall surface.

[0009] It can be seen from the above scheme that when the electric heater of the present invention is used in an air-conditioning indoor unit, the air-conditioning indoor unit includes a casing, an evaporator and an electric heater. The evaporator and the electric heater are respectively arranged inside the casing, and the electric heater is located on the air outlet side of the evaporator. Since condensed water is easily formed on the surface of the heat dissipation fins of the electric heater close to the air outlet side of the evaporator, the extended end of the first auxiliary fin of the electric heater of the present invention is arranged close to the evaporator, and at least one first auxiliary fin is arranged parallel to the horizontal direction, so that the condensed water on the surface of the heat dissipation fin of the electric heater will be guided by the first auxiliary fin to converge to the inclined angle between the first auxiliary fin and the heating core tube. After the condensed water is gathered at the inclined angle between the first auxiliary fin and the heating core tube, since the heating core tube of the electric heater can be heated and dried, the condensed water can be prevented from dripping from the surface of the electric heater, so as to prevent the condensed water on the surface of the electric heater from dripping onto the flow skeleton and the air outlet duct of the air-conditioning indoor unit, thereby reducing or even avoiding the negative impact of condensation on the air-conditioning indoor unit, so as to ensure the safe and stable operation of the air conditioner, and thus improve the heat exchange effect of the air conditioner and the user experience. At the same time, the first auxiliary fin of the electric heater of the present invention is extended in the length direction of its heating core tube and connected in series with the multiple heat dissipation fins of the fin structure, and the root end of the first auxiliary fin is connected to the first tube wall of the heating core tube, the extended end of the first auxiliary fin is connected to the free end of the heat dissipation fin away from the heating core tube, the root end of the first auxiliary fin is arranged close to the first side of the heat dissipation fin, the extended end of the first auxiliary fin is arranged close to the second side of the heat dissipation fin, and the first side of the heat dissipation fin and the second side of the heat dissipation fin are arranged relative to each other in the width direction of the heating core tube, so that the first auxiliary fin is arranged in a straight face and inclined relative to the first tube wall of the heating core tube, thereby enhancing the fin structure strength of the electric heater, preventing the electric heater from deforming during the disassembly and use stages, and improving the heating effect and service life of the electric heater. In addition, the first auxiliary fin added to the electric heater of the present invention is extended in the length direction of its heating core tube and connected in series with the multiple heat dissipation fins of the fin structure, which can increase the heat dissipation area of ​​the electric heater, thereby improving the heat dissipation efficiency of the electric heater, and further improving the heating effect of the electric heater.

[0010] Alternatively, when the electric heater of the present invention is used in an air-conditioning indoor unit, the air-conditioning indoor unit includes a casing, an evaporator and an electric heater, the evaporator and the electric heater are respectively arranged inside the casing, and the electric heater is located on the air outlet side of the evaporator. Since condensed water is easily formed on the surface of the heat dissipation fins of the electric heater close to the air outlet side of the evaporator, the extended end of the second auxiliary fin of the electric heater of the present invention is arranged close to the evaporator, and at least one second auxiliary fin is arranged parallel to the horizontal direction, so that the condensed water on the surface of the heat dissipation fin of the electric heater will be guided by the second auxiliary fin to converge to the inclined angle between the second auxiliary fin and the heating core tube. After the condensed water is gathered at the inclined angle between the second auxiliary fin and the heating core tube, since the heating core tube of the electric heater can be heated and dried, the condensed water can be prevented from dripping from the surface of the electric heater, so as to prevent the condensed water on the surface of the electric heater from dripping onto the flow skeleton and the air outlet duct of the air-conditioning indoor unit, thereby reducing or even avoiding the negative impact of condensation on the air-conditioning indoor unit, so as to ensure the safe and stable operation of the air conditioner, and further improve the heat exchange effect of the air conditioner and the user experience. At the same time, the two second auxiliary fins of the electric heater of the present invention are respectively connected to the first side and the second side of the plurality of heat dissipation fins of a group of fin structures in the width direction of the heating core tube, the root end of each second auxiliary fin is connected to the first tube wall surface of the heating core tube, the extended end of each second auxiliary fin is connected to the free end of the heat dissipation fin away from the heating core tube, and the second auxiliary fin is arranged to be inclined in a straight face relative to the first tube wall surface of the heating core tube, thereby enhancing the fin structure strength of the electric heater to prevent the fins of the electric heater from deforming during the disassembly and use stages, and improving the heating effect and service life of the electric heater. In addition, the two second auxiliary fins added to the electric heater of the present invention are respectively connected to the first side and the second side of the plurality of heat dissipation fins of a group of fin structures in the width direction of the heating core tube, which can increase the heat dissipation area of ​​the electric heater, thereby improving the heat dissipation efficiency of the electric heater, and further improving the heating effect of the electric heater.

[0011] A preferred solution is that the outwardly extending end of the first auxiliary fin is arranged to protrude from the free end of the heat dissipation fin; and / or the outwardly extending end of the first auxiliary fin is arranged to protrude from the second side surface of the heat dissipation fin.

[0012] A further solution is that the root end of the first auxiliary fin is located between the first side surface of the heat dissipation fin and the second side surface of the heat dissipation fin in the width direction of the heat core tube.

[0013] A further solution is that the extended end of the second auxiliary fin is arranged to protrude from the free end of the heat dissipation fin.

[0014] A further solution is that the extended end of the second auxiliary fin is located outside the root end of the second auxiliary fin in the width direction of the heating core tube.

[0015] A further solution is that the heat dissipating fins are arranged in a straight and inclined manner relative to the first tube wall; or, the heat dissipating fins are arranged in a straight manner in a direction perpendicular to the first tube wall; or, the heat dissipating fins are arranged in an arcuate manner from the first tube wall toward the free end of the heat dissipating fin.

[0016] A further solution is that the heat dissipation fins are made of aluminum alloy material; and / or the first auxiliary fins are made of aluminum alloy material, or the second auxiliary fins are made of aluminum alloy material.

[0017] A further solution is that the number of fin structures is two groups, and the two groups of fin structures are symmetrically located on the first tube wall surface and the second tube wall surface of the heat-generating core tube, and the first tube wall surface and the second tube wall surface are relatively arranged in the height direction of the heat-generating core tube; the number of first auxiliary fins is two, and one first auxiliary fin is adapted to one group of fin structures; or, the number of second auxiliary fins is four, and two second auxiliary fins are adapted to one group of fin structures.

[0018] In order to achieve the second purpose of the present invention, the present invention provides an air-conditioning indoor unit, including a casing, an evaporator and an electric heater, the evaporator and the electric heater are respectively arranged inside the casing, and the electric heater is located on the air outlet side of the evaporator, and the electric heater is the above-mentioned electric heater; the outward end of the first auxiliary fin of the electric heater is arranged close to the evaporator, and at least one first auxiliary fin is arranged parallel to the horizontal direction; or, the outward end of the second auxiliary fin of the electric heater is arranged close to the evaporator, and at least one second auxiliary fin is arranged parallel to the horizontal direction.

[0019] In order to achieve the third objective of the present invention, the present invention provides an air conditioner, including an air conditioner indoor unit, and the air conditioner indoor unit is the air conditioner indoor unit mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the front view of the existing electric heater.

[0021] Figure 2 It is a structural diagram of the first embodiment of the electric heater of the present invention.

[0022] Figure 3 It is a front view of the first embodiment of the electric heater of the present invention.

[0023] Figure 4 1 is a top view of the first embodiment of the electric heater of the present invention.

[0024] Figure 5 It is a cross-sectional view from a first perspective of the first embodiment of the electric heater of the present invention.

[0025] Figure 6 It is a cross-sectional view from a second viewing angle of the first embodiment of the electric heater of the present invention.

[0026] Figure 7 It is a schematic diagram of the installation of the first embodiment of the electric heater of the present invention in the indoor unit of the air conditioner.

[0027] Figure 8 It is a cross-sectional view of a second embodiment of the electric heater of the present invention.

[0028] Fig. 9 It is a cross-sectional view of a third embodiment of the electric heater of the present invention.

[0029] Fig.10 It is a structural diagram of a fourth embodiment of the electric heater of the present invention.

[0030] Fig.11 It is a front view of a fourth embodiment of an electric heater of the present invention.

[0031] Fig.12 is a cross-sectional view of a fourth embodiment of the electric heater of the present invention.

[0032] Fig.13 Schematic diagram of the fourth embodiment of the electric heater of the present invention installed in the indoor unit of the air conditioner.

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0034] The first embodiment of the electric heater:

[0035] See also Figures 2 to 6 This embodiment discloses an electric heater 20, including a heating core tube 21 and at least one group of fin structures 22, wherein a plurality of heat dissipating fins 221 of the group of fin structures 22 are arranged side by side on a first tube wall surface 211 of the heating core tube 21 in a length direction X of the heating core tube 21. Specifically, the electric heater 20 of this embodiment also includes at least one first auxiliary fin 23, which extends in the length direction X of the heat core tube 21 and is connected to multiple heat dissipation fins 221 of a group of fin structures 22, and the root end 231 of the first auxiliary fin 23 is connected to the first tube wall 211 of the heat core tube 21, and the extended end 232 of the first auxiliary fin 23 is connected to the free end 2213 of the heat dissipation fin 221 away from the heat core tube 21, the root end 231 of the first auxiliary fin 23 is arranged close to the first side surface 2211 of the heat dissipation fin 221, and the extended end 232 of the first auxiliary fin 23 is arranged close to the second side surface 2212 of the heat dissipation fin 221, and the first side surface 2211 of the heat dissipation fin 221 and the second side surface 2212 of the heat dissipation fin 221 are arranged relative to each other in the width direction Y of the heat core tube 21, so that the first auxiliary fin 23 is arranged to be inclined in a straight face relative to the first tube wall 211 of the heat core tube 21.

[0036] When the electric heater 20 of this embodiment is used in an air conditioner indoor unit, the air conditioner indoor unit includes a housing, an evaporator and an electric heater 20. The evaporator and the electric heater 20 are respectively arranged inside the housing, and the electric heater 20 is located on the air outlet side of the evaporator. Since the surface of the heat dissipation fin 221 of the electric heater 20 close to the air outlet side of the evaporator is prone to condensation water, Figure 7 As shown, the extended end 232 of the first auxiliary fin 23 of the electric heater 20 of this embodiment is arranged close to the evaporator, and at least one first auxiliary fin 23 is arranged parallel to the horizontal direction, so that the condensed water on the surface of the heat dissipation fin 221 of the electric heater 20 will be guided by the first auxiliary fin 23 to converge to the inclined angle between the first auxiliary fin 23 and the heating core tube 21. After the condensed water is gathered at the inclined angle between the first auxiliary fin 23 and the heating core tube 21, since the heating core tube 21 of the electric heater 20 can be heated and dried, the condensed water can be prevented from dripping from the surface of the electric heater 20, so as to prevent the condensed water on the surface of the electric heater 20 from dripping onto the flow skeleton and the air outlet duct of the air-conditioning indoor unit, thereby reducing or even avoiding the negative impact of condensation on the air-conditioning indoor unit, so as to ensure the safe and stable operation of the air conditioner, and thus improve the heat exchange effect of the air conditioner and the user experience.

[0037] At the same time, the first auxiliary fin 23 of the electric heater 20 of the present embodiment is extended in the length direction X of the heat core tube 21 thereof and is connected in series with the plurality of heat dissipation fins 221 of the fin structure 22, and the root connection end 231 of the first auxiliary fin 23 is connected to the first tube wall surface 211 of the heat core tube 21, the extended end 232 of the first auxiliary fin 23 is connected to the free end 2213 of the heat dissipation fin 221 away from the heat core tube 21, the root connection end 231 of the first auxiliary fin 23 is arranged close to the first side surface 2211 of the heat dissipation fin 221, and the first auxiliary fin 23 is connected to the first tube wall surface 211 of the heat core tube 21. The protruding end 232 of the sheet 23 is arranged close to the second side surface 2212 of the heat dissipating fin 221, and the first side surface 2211 of the heat dissipating fin 221 and the second side surface 2212 of the heat dissipating fin 221 are arranged relative to each other in the width direction Y of the heating core tube 21, so that the first auxiliary fin 23 is arranged to be inclined in a straight surface relative to the first tube wall surface 211 of the heating core tube 21, thereby enhancing the strength of the fin structure 22 of the electric heater 20 to prevent the fin deformation of the electric heater 20 during the disassembly and use stages, thereby improving the heating effect and service life of the electric heater 20.

[0038] Furthermore, the first auxiliary fin 23 added to the electric heater 20 of this embodiment extends in the length direction X of the heating core tube 21 and is connected in series with the multiple heat dissipation fins 221 of the fin structure 22, which can increase the heat dissipation area of ​​the electric heater 20, thereby improving the heat dissipation efficiency of the electric heater 20 and further improving the heating effect of the electric heater 20.

[0039] In order to further enhance the condensation water guiding and converging effect to prevent condensation water from dripping from the surface of the electric heater 20 , the root end 231 of the first auxiliary fin 23 of this embodiment is located between the first side surface 2211 of the heat dissipating fin 221 and the second side surface 2212 of the heat dissipating fin 221 in the width direction Y of the heat core tube 21 .

[0040] In order to further improve the heat dissipation efficiency and the heating effect, the heat dissipation fins 221 of this embodiment are arranged in a straight face and tilted relative to the first tube wall surface 211 of the heat core tube 21, which can increase the heat dissipation area of ​​the heat dissipation fins 221. In another possible implementation, the heat dissipation fins 221 are arranged in a straight face in a direction perpendicular to the first tube wall surface 211 of the heat core tube 21, that is, the heat dissipation fins 221 are arranged vertically on the first tube wall surface 211 of the heat core tube 21. Specifically, the heat dissipation fins 221 of this embodiment are made of aluminum alloy material, and the first auxiliary fins 23 of this embodiment are made of aluminum alloy material.

[0041] In order to further improve the heat dissipation efficiency and improve the heating effect, the number of fin structures 22 in this embodiment is two groups, and the two groups of fin structures 22 are symmetrically located on the first tube wall surface 211 of the heating core tube 21 and the second tube wall surface 212 of the heating core tube 21 about the heating core tube 21. The first tube wall surface 211 of the heating core tube 21 and the second tube wall surface 212 of the heating core tube 21 are relatively arranged in the height direction Z of the heating core tube 21, and the number of first auxiliary fins 23 in this embodiment is two, and one first auxiliary fin 23 is adapted to one group of fin structures 22.

[0042] Preferably, the angle θ between the two first auxiliary fins 23 of the electric heater 20 of this embodiment toward the evaporator is 60°, so that when used in an air conditioner indoor unit, the lower first auxiliary fin 23 of the electric heater 20 close to the evaporator is arranged parallel to the horizontal direction, and the upper first auxiliary fin 23 of the electric heater 20 close to the evaporator is arranged to extend upward and toward the evaporator. Figure 7 shown.

[0043] The second embodiment of the electric heater:

[0044] As an explanation of the second embodiment of the electric heater of the present invention, only the differences from the first embodiment of the electric heater are explained below.

[0045] See also Figure 8In this embodiment, the extended end 232 of the first auxiliary fin 23 protrudes from the free end 2213 of the heat dissipation fin 221, so that the extended end 232 of the first auxiliary fin 23 extends out of the free end 2213 of the heat dissipation fin 221, thereby guiding the condensed water at the free end 2213 of the heat dissipation fin 221 to converge at the inclined angle between the first auxiliary fin 23 and the heating core tube 21, further effectively preventing the condensed water from dripping from the surface of the electric heater, so as to prevent the condensed water on the surface of the electric heater from dripping onto the flow skeleton and the air outlet duct, thereby reducing or even avoiding the negative impact of condensation on the indoor unit of the air conditioner, so as to ensure the safe and stable operation of the air conditioner, and further improve the heat exchange effect of the air conditioner and the user experience.

[0046] In order to further enhance the condensation water guiding and converging effect and prevent condensation water from dripping from the surface of the electric heater, the extended end 232 of the first auxiliary fin 23 of this embodiment protrudes from the second side 2212 of the heat dissipating fin 221, thereby being able to guide the condensation water on the second side 2212 of the heat dissipating fin 221 to converge to the inclined angle between the first auxiliary fin 23 and the heating core tube 21.

[0047] The third embodiment of the electric heater:

[0048] As an explanation of the third embodiment of the electric heater of the present invention, only the differences from the first embodiment of the electric heater are explained below.

[0049] See also Fig. 9 In this embodiment, the heat dissipation fin 221 is arranged in an arc-shaped surface from the first tube wall surface 211 of the heating core tube 21 toward the free end 2213 of the heat dissipation fin 221, further increasing the heat dissipation area of ​​the heat dissipation fin 221, improving the heat dissipation efficiency of the electric heater, and further improving the heating effect of the electric heater.

[0050] The fourth embodiment of the electric heater:

[0051] As an explanation of the fourth embodiment of the electric heater of the present invention, only the differences from the first embodiment of the electric heater are explained below.

[0052] See also Figures 10 to 12The electric heater 30 of this embodiment includes a heating core tube 31 and at least one group of fin structures 32. A plurality of heat dissipating fins 321 of a group of fin structures 32 are arranged side by side on the first tube wall surface 311 of the heating core tube 31 in the length direction X of the heating core tube 31. Specifically, the electric heater 30 of this embodiment also includes at least two second auxiliary fins 33. The two second auxiliary fins 33 are respectively connected to the first side surface and the second side surface of a plurality of heat dissipating fins 321 of a group of fin structures 32 in the width direction Y of the heating core tube 31. The root end 331 of each second auxiliary fin 33 is connected to the first tube wall surface 311 of the heating core tube 31, and the extended end 332 of each second auxiliary fin 33 is connected to the free end 3211 of the heat dissipating fin 321 away from the heating core tube 31, and the second auxiliary fin 33 is arranged to be straight and inclined relative to the first tube wall surface 311 of the heating core tube 31.

[0053] When the electric heater 30 of this embodiment is used in an air conditioner indoor unit, the air conditioner indoor unit includes a housing, an evaporator and an electric heater 30. The evaporator and the electric heater 30 are respectively arranged inside the housing, and the electric heater 30 is located on the air outlet side of the evaporator. Since the surface of the heat dissipation fin 321 of the electric heater 30 close to the air outlet side of the evaporator is prone to condensation water, Fig.13 As shown, the extended end 332 of the second auxiliary fin 33 of the electric heater 30 of this embodiment is arranged close to the evaporator, and at least one second auxiliary fin 33 is arranged parallel to the horizontal direction, so that the condensed water on the surface of the heat dissipation fin 321 of the electric heater 30 will be guided by the second auxiliary fin 33 to converge to the inclined angle between the second auxiliary fin 33 and the heating core tube 31. After the condensed water is gathered at the inclined angle between the second auxiliary fin 33 and the heating core tube 31, since the heating core tube 31 of the electric heater 30 can be heated and dried, the condensed water can be prevented from dripping from the surface of the electric heater 30, so as to prevent the condensed water on the surface of the electric heater 30 from dripping onto the flow skeleton and the air outlet duct of the air-conditioning indoor unit, thereby reducing or even avoiding the negative impact of condensation on the air-conditioning indoor unit, so as to ensure the safe and stable operation of the air conditioner, and thus improve the heat exchange effect of the air conditioner and the user experience.

[0054] At the same time, the two second auxiliary fins 33 of the electric heater 30 of the present embodiment are respectively connected to the first side and the second side of a plurality of heat dissipation fins 321 of a group of fin structures 32 in the width direction Y of the heat core tube 31, and the root end 331 of each second auxiliary fin 33 is connected to the first tube wall surface 311 of the heat core tube 31, and the extended end 332 of each second auxiliary fin 33 is connected to the free end 3211 of the heat dissipation fin 321 away from the heat core tube 31, and the second auxiliary fins 33 are inclined in a straight surface relative to the first tube wall surface 311 of the heat core tube 31, thereby enhancing the strength of the fin structure 32 of the electric heater 30 to prevent the fins of the electric heater 30 from deforming during the disassembly and use stages, thereby improving the heating effect and service life of the electric heater 30.

[0055] Furthermore, the two second auxiliary fins 33 added to the electric heater 30 of this embodiment are respectively connected to the first side and the second side of a plurality of heat dissipation fins 321 of a group of fin structures 32 in the width direction Y of the heating core tube 31, which can increase the heat dissipation area of ​​the electric heater 30, thereby improving the heat dissipation efficiency of the electric heater 30, and further improving the heating effect of the electric heater 30.

[0056] In order to further enhance the condensation water guiding and converging effect and prevent condensation water from dripping from the surface of the electric heater 30, the extended end 332 of the second auxiliary fin 33 of this embodiment is arranged to protrude from the free end 3211 of the heat dissipating fin 321, so that the condensation water at the free end 3211 of the heat dissipating fin 321 can be guided and converged to the inclined angle between the second auxiliary fin 33 and the heating core tube 31.

[0057] In order to further improve the heat dissipation efficiency and the heating effect, the extended end 332 of the second auxiliary fin 33 of the present embodiment is located outside the root end 331 of the second auxiliary fin 33 in the width direction Y of the heat core tube 31, that is, the second auxiliary fin 33 of the present embodiment is tilted outward relative to the first tube wall surface 311 of the heat core tube 31, thereby increasing the heat dissipation area of ​​the second auxiliary fin 33. Furthermore, the heat dissipation fin 321 of the present embodiment is tilted in a straight face relative to the first tube wall surface 311 of the heat core tube 31, which can increase the heat dissipation area of ​​the heat dissipation fin 321.

[0058] In order to further improve the heat dissipation efficiency and the heating effect, the number of the fin structures 32 in this embodiment is two groups, and the two groups of fin structures 32 are symmetrically located on the first tube wall surface 311 and the second tube wall surface 312 of the heat core tube 31 with respect to the heat core tube 31, respectively. The first tube wall surface 311 of the heat core tube 31 and the second tube wall surface 312 of the heat core tube 31 are arranged relatively in the height direction Z of the heat core tube 31, and the number of the second auxiliary fins 33 in this embodiment is four, and two second auxiliary fins 33 are adapted to one group of fin structures 32. Specifically, the heat dissipation fins 321 in this embodiment are made of aluminum alloy material, and the second auxiliary fins 33 in this embodiment are made of aluminum alloy material.

[0059] Preferably, when the electric heater 30 of this embodiment is used in an indoor unit of an air conditioner, the lower second auxiliary fin 33 of the electric heater 30 close to the evaporator is arranged parallel to the horizontal direction, and the upper second auxiliary fin 33 of the electric heater 30 close to the evaporator is arranged to extend upward and toward the evaporator. Fig.13 shown.

[0060] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. An electric heater, comprising a heating core tube and at least one set of fin structures, wherein a plurality of heat dissipating fins of a set of fin structures are arranged side by side on a first tube wall surface of the heating core tube in the length direction of the heating core tube, characterized in that: The electric heater further comprises at least one first auxiliary fin, wherein the first auxiliary fin extends in the length direction of the heat-generating core tube and is connected to a plurality of the heat-dissipating fins of a group of the fin structures, and the root end of the first auxiliary fin is connected to the first tube wall surface, the outward end of the first auxiliary fin is connected to the free end of the heat-dissipating fin away from the heat-generating core tube, the root end of the first auxiliary fin is arranged close to the first side surface of the heat-dissipating fin, the outward end of the first auxiliary fin is arranged close to the second side surface of the heat-dissipating fin, the first side surface and the second side surface are arranged opposite to each other in the width direction of the heat-generating core tube, so that the first auxiliary fin is arranged to be inclined in a straight face relative to the first tube wall surface; Alternatively, the electric heater also includes at least two second auxiliary fins, which are respectively connected to the first side and the second side of a plurality of the heat dissipation fins of a group of the fin structure in the width direction of the heat core tube, the root end of each of the second auxiliary fins is connected to the first tube wall surface, the extending end of each of the second auxiliary fins is connected to the free end of the heat dissipation fin away from the heat core tube, and the second auxiliary fins are arranged to be straight and inclined relative to the first tube wall surface.

2. The electric heater according to claim 1, characterized in that: The extended end of the first auxiliary fin protrudes from the free end of the heat dissipation fin; And / or, the extended end of the first auxiliary fin protrudes from the second side surface of the heat dissipation fin.

3. The electric heater according to claim 1, characterized in that: The root end of the first auxiliary fin is located between the first side surface of the heat dissipation fin and the second side surface of the heat dissipation fin in the width direction of the heat core tube.

4. The electric heater according to claim 1, characterized in that: The extended end of the second auxiliary fin is arranged to protrude from the free end of the heat dissipation fin.

5. The electric heater according to claim 1, characterized in that: The extended end of the second auxiliary fin is located outside the root end of the second auxiliary fin in the width direction of the heat-generating core tube.

6. The electric heater according to claim 1, characterized in that: The heat dissipation fins are arranged to be straight and inclined relative to the first tube wall surface; Alternatively, the heat dissipation fins are arranged in a straight surface in a direction perpendicular to the first tube wall surface; Alternatively, the heat dissipation fin is arranged in an arc-shaped surface from the first tube wall surface toward the free end of the heat dissipation fin.

7. The electric heater according to claim 1, characterized in that: The heat dissipation fins are made of aluminum alloy material; And / or, the first auxiliary fin is made of aluminum alloy material, or the second auxiliary fin is made of aluminum alloy material.

8. The electric heater according to any one of claims 1 to 7, characterized in that: The number of the fin structures is two groups, and the two groups of fin structures are symmetrically located on the first tube wall surface and the second tube wall surface of the heat-generating core tube, respectively, and the first tube wall surface and the second tube wall surface are arranged opposite to each other in the height direction of the heat-generating core tube; The number of the first auxiliary fins is two, and one first auxiliary fin is adapted to a group of the fin structures; Alternatively, the number of the second auxiliary fins is four, and two of the second auxiliary fins are adapted to one set of the fin structure.

9. An air conditioner indoor unit, comprising a casing, an evaporator and an electric heater, wherein the evaporator and the electric heater are respectively arranged inside the casing, and the electric heater is located at the air outlet side of the evaporator, characterized in that: The electric heater is an electric heater as claimed in any one of claims 1 to 8; The extended end of the first auxiliary fin of the electric heater is arranged close to the evaporator, and at least one of the first auxiliary fins is arranged parallel to the horizontal direction; Alternatively, the extended ends of the second auxiliary fins of the electric heater are arranged close to the evaporator, and at least one of the second auxiliary fins is arranged parallel to the horizontal direction.

10. An air conditioner, including an air conditioner indoor unit, characterized in that: The air-conditioning indoor unit is the air-conditioning indoor unit according to claim 9 above.

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