CN106376106B

CN106376106B - PTC electric heater of air conditioner indoor unit and air conditioner indoor unit

Info

Publication number: CN106376106B
Application number: CN201610938495.1A
Authority: CN
Inventors: 程毅
Original assignee: Midea Group Co Ltd; Midea Group Wuhan Refrigeration Equipment Co Ltd
Current assignee: Midea Group Co Ltd; Midea Group Wuhan Refrigeration Equipment Co Ltd
Priority date: 2016-10-24
Filing date: 2016-10-24
Publication date: 2023-01-03
Anticipated expiration: 2036-10-24
Also published as: CN106376106A

Abstract

The invention discloses a PTC electric heater of an air conditioner indoor unit and the air conditioner indoor unit, wherein the PTC electric heater of the air conditioner indoor unit comprises: the heating strips comprise a strip-shaped shell and heating elements arranged in the shell, the heating strips are arranged side by side, and the heating strips are connected in parallel; the shell comprises a top plate and a bottom plate which are oppositely arranged and are in an outward convex arc shape, and two side plates positioned between the top plate and the bottom plate; the heat dissipation strips are fixed on two sides of the heat generation strips and connected with the outer wall surfaces of the side plates; the top surface of the heat dissipation strip is lower than the top plate, and the bottom surface of the heat dissipation strip is lower than the bottom plate; the left base is fixed at the left ends of the heating strip and the heat dissipation strip; and the right base is fixed at the right ends of the heating strip and the heat dissipation strip. The PTC electric heater heating bar of the indoor unit of the air conditioner has high total power, so that the effect of quick heating can be achieved.

Description

PTC electric heater of air conditioner indoor unit and air conditioner indoor unit

Technical Field

The invention relates to the field of air conditioners, in particular to a PTC electric heater of an air conditioner indoor unit and the air conditioner indoor unit.

Background

Generally, people start a heating mode of an air conditioner on days with low ambient temperature, and mainly use an electric heater of an indoor unit of the air conditioner to assist in heating. The electric heater of the existing air-conditioning indoor unit mainly adopts a PTC heater, and the existing PTC heater only comprises a heating strip, and the installation space in the air duct of the air-conditioning indoor unit is limited, so that the length of the heating strip is relatively short; in addition, because the cross-sectional shape of the casing of the heating bar is rectangular or the top plate and the bottom plate which are opposite to each other are concave arc-shaped, a heating element with larger capacity cannot be arranged in the casing of the heating bar, so that the power of the electric heater is low and the electric heater cannot rapidly heat.

Disclosure of Invention

The invention mainly aims to provide a PTC electric heater of an air conditioner indoor unit, and aims to solve the technical problems that the conventional PTC electric heater of the air conditioner indoor unit is low in power and cannot rapidly heat.

In order to achieve the above object, the present invention provides a PTC electric heater for an indoor unit of an air conditioner, comprising:

the heating strips comprise a strip-shaped shell and heating elements arranged in the shell, the heating strips are arranged side by side, and the heating strips are connected in parallel;

the shell comprises a top plate and a bottom plate which are oppositely arranged and are in an outward convex arc shape, and two side plates positioned between the top plate and the bottom plate;

the heat dissipation strips are fixed on two sides of the heat generation strips and connected with the outer wall surfaces of the side plates; the top surface of the heat dissipation strip is lower than the top plate, and the bottom surface of the heat dissipation strip is lower than the bottom plate;

the left base is fixed at the left ends of the heating strip and the heat dissipation strip; and

and the right base is fixed at the right ends of the heating strip and the heat dissipation strip.

Preferably, the right base is provided with a right mounting hole sleeved with the right ends of the heating strip and the heat dissipation strip, and two side wall surfaces opposite to the right mounting hole are respectively provided with a right slot matched with the top plate and the bottom plate;

the left base is provided with a left mounting hole which is sleeved with the left ends of the heating strip and the heat dissipation strip, and two side wall surfaces opposite to the left mounting hole are respectively provided with a left slot which is matched with the top plate and the bottom plate.

Preferably, the right base includes the end wall and certainly top wall, the diapire that extend to the right in the edge of end wall and be located both sides wall between top wall and the diapire, be equipped with a plurality of confessions on the end wall a plurality of logical grooves that the electric connecting wire of heating strip wore to establish.

Preferably, the PTC electric heater further comprises a fuse, and a first insertion hole for accommodating the fuse is opened in an end surface of the top wall facing the left base.

Preferably, the PTC electric heater further comprises a temperature controller, and a second insertion hole for accommodating the temperature controller is formed in an end surface of the top wall, which is away from the left base.

Preferably, the PTC electric heater further comprises a side cover which is snapped on an end of the right base facing away from the left base.

Preferably, two heat dissipation strips are arranged between two adjacent heat generation strips, and the total width of the heat dissipation strips between two adjacent heat generation strips is larger than the width of the heat dissipation strips positioned at two side edges.

Preferably, the heat dissipation device further comprises a supporting plate and two baffle plates, the supporting plate is arranged between every two adjacent heat dissipation strips, and each heat dissipation strip are clamped between the two baffle plates.

Preferably, the thickness of the supporting plate is greater than that of the baffle plate, and the thickness range of the supporting plate is as follows: 0.7 mm-1 mm, the thickness range of the baffle plate is as follows: 0.5 mm-0.7 mm.

The invention also proposes an air-conditioning indoor unit, comprising a PTC electric heater, which comprises:

the shell comprises a top plate, a bottom plate and two side plates, wherein the top plate and the bottom plate are oppositely arranged and are in an outward convex arc shape;

The PTC electric heater of the indoor unit of the air conditioner is provided with the plurality of heating strips in parallel, and all the heating strips are connected in parallel; meanwhile, the shell of the heating strip is improved, the top plate and the top plate which are oppositely arranged are in an outward convex arc shape, and the capacity of the installation space of the heating element arranged in the shell is expanded, so that the total power of the heating strip is improved on the premise that the PTC electric heater can sufficiently radiate heat, and the effect of quickly heating can be achieved.

Drawings

In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of a PTC electric heater of an indoor unit of an air conditioner according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a partially simplified structural schematic view of the PTC electric heater of the air conditioning indoor unit of fig. 1;

fig. 4 is an exploded view of the PTC electric heater of the air conditioning indoor unit of fig. 3;

FIG. 5 is a partial enlarged view of the portion B in FIG. 4;

FIG. 6 is a schematic structural view of the right base in FIG. 5;

FIG. 7 is a cross-sectional view of the right base of FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 4 at C;

fig. 9 is another perspective exploded view of the PTC electric heater of the air conditioning indoor unit of fig. 3;

FIG. 10 is an enlarged view of a portion of FIG. 9 at D;

FIG. 11 is a schematic view of the structure of the right base and the electrical connection wire in FIG. 9;

FIG. 12 is a schematic view of the assembly of the heat bar and the heat sink bar of FIG. 1;

FIG. 13 is an enlarged view of a portion of FIG. 12 at E;

fig. 14 is a schematic structural view of another embodiment of a heating bar and heat dissipation bar assembly of the PTC electric heater of the indoor unit of an air conditioner according to the present invention;

fig. 15 is a top view of the heat bar and heat sink bar assembly of fig. 14.

The reference numbers illustrate:

the implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a PTC electric heater of an indoor unit of an air conditioner.

In an embodiment of the present invention, as shown in fig. 1 to 4, the PTC electric heater of the air conditioning indoor unit includes:

the heating strips (1,1 ') comprise a long-strip-shaped shell and heating elements arranged in the shell, the heating strips (1,1 ') are arranged side by side, and the heating strips (1,1 ') are connected in parallel;

a plurality of heat dissipation bars (2,2 ') fixed at both sides of the heat generation bar (1,1') and connected with the outer wall surface of the side plate; the top surface of the heat dissipation strip (2,2') is lower than the top plate, and the bottom surface is lower than the bottom plate;

the left base 3 is fixed at the left ends of the heating bar (1,1 ') and the heat dissipation bar (2,2'); and

the right base 4 is fixed to the right ends of the heat generating bar (1,1 ') and the heat dissipating bar (2,2').

In this embodiment, the housing of the heat-generating strip (1,1 ') and the heat sink of the heat-dissipating strip (2,2') are both made of aluminum, which is light and easy to manufacture.

Referring to fig. 1, 2, 12 and 13, the top or bottom of the fins of the heat dissipation bar 2 is in a wave shape extending along the length direction of the heat generation bar 1, and the heat dissipation bar (2,2') may be fixedly connected to the housing by brazing.

Alternatively, referring to fig. 14 and 15, the top or bottom surface of the heat sink bar 2 'is shaped like a scoop that is arranged along the longitudinal direction of the heat sink bar 1' and extends to both sides. The radiating fins are integrally arranged with the shell in a shoveling processing mode.

When the air conditioner is installed, the left end and the right end of the PTC electric heater are respectively fixedly connected with the left side plate and the right side plate of the air duct of the indoor unit of the air conditioner through the left base 3 and the right base 4. The left and right bases 4 are generally made of an insulating material, such as plastic, and are integrally molded.

The PTC electric heater of the air conditioner indoor unit is provided with a plurality of heating strips (1,1 ') in parallel, and all the heating strips (1,1') are connected in parallel; meanwhile, the shell of the heating strip (1,1 ') is improved, the top plate and the top plate which are oppositely arranged are in an outward convex arc shape, and the capacity of the installation space of the heating element arranged in the shell is expanded, so that the total power of the heating strip (1, 1') is improved on the premise that the PTC electric heater can fully radiate heat, and the effect of quickly heating can be achieved.

Further, referring to fig. 7 to 10, in an embodiment, the right base 4 has a right mounting hole 41 sleeved with the right ends of the heat generating bar (1,1 ') and the heat dissipating bar (2,2'), and two opposite side walls 46 of the right mounting hole 41 are respectively provided with a right slot 42 adapted to the top plate and the bottom plate;

the left base 3 is provided with a left mounting hole 31 sleeved with the left ends of the heating bar (1,1 ') and the heat dissipation bar (2,2'), and two side walls 46 surfaces opposite to the left mounting hole 31 are respectively provided with a left inserting groove 32 matched with the top plate and the bottom plate.

In this embodiment, the left and right ends of the PTC electric heater are respectively fitted with the left and

right bases

3 and 4, so that the ends of the PTC electric heater can be firmly tightened in the width direction of the PTC electric heater, and the heat-generating strip (1,1 ') and the heat-dissipating strip (2,2') can be well assembled. Meanwhile, the left slot 32 and the top plate and the bottom plate in the outward arc shape are matched, and the right slot 42 and the top plate and the bottom plate in the outward arc shape are matched, so that the guiding and positioning effects can be achieved when the left base 3 and the right base 4 are assembled. It will be appreciated that the left and

right slots

32, 42 may be square groove shaped, but to achieve better sealing, it is necessary to fill the gap between the left and

right slots

32, 42 and the outer wall of the housing with silicone.

Further, referring to fig. 5 to 7, in an embodiment, the right base 4 includes an end wall, a top wall 44 extending rightwards from an edge of the end wall, a bottom wall 45, and two side walls 46 located between the top wall 44 and the bottom wall 45, and the end wall is provided with a plurality of through grooves 431 for the electrical connection wires of the heat generating strips (1,1') to pass through.

In this embodiment, it is preferable that the electrical connection lines of all the heat generating bars (1,1') are provided at the same end, i.e., the right end, which is advantageous in simplifying the assembly. The tail end of the electric connecting wire of the heating bar (1,1') is pressed with a wiring terminal male head, and a heat shrink tube for insulation is sleeved at the connecting part of the electric connecting wire and the wiring terminal male head, as shown in fig. 13. Each terminal male head correspondingly penetrates through a through groove 431, and the terminal male head penetrates through the through groove 431 and is matched with a terminal female head of a jumper wire, see fig. 11.

Preferably, the outer wall surface of the end wall is provided with a separation stop piece 432 protruding between two adjacent through slots 431. Therefore, the male head and the female head of each group of wiring terminals can be further isolated, and better insulating performance is realized.

In order to further prevent the left base 3 and the right base 4 from being loosened, referring to fig. 3 to 5, a side wall 46 of the right base 4 and a side surface on the same side as the left base 3 are provided with fixing holes 462 for fixing the heat dissipation bars (2,2'). Thus, screws can be screwed into the fixing holes 462 to fix the left base 3 and the right base 4, respectively.

Further, referring to fig. 2, fig. 5, fig. 6, fig. 10 and fig. 11, in an embodiment, the PTC electric heater further includes a fuse 5, and an end surface of the top wall 44 facing the left base 3 is opened with a first insertion hole 441 for accommodating the fuse 5.

In the present embodiment, when the current of the heating element of the PTC electric heater is too high, overheating protection can be achieved by the fusing of the fuse 5, and the heating element is prevented from being burned out.

Generally, the fuse 5 is generally cylindrical, and the first receptacle 441 is a circular hole. The first insertion hole 441 is preferably provided in a penetrating shape for facilitating attachment and detachment of the fuse 5.

A first limit plate 443 is protruded from the outer wall surface of the top wall 44 adjacent to the end wall, and an open slot 444 for clamping the electrical connection wire of the fuse 5 is formed in the first limit plate 443.

The first limiting plate 443 is arranged to facilitate the right base 4 to be positioned and fixed with the right side plate of the air duct of the indoor unit of the air conditioner, and specifically, a step surface for positioning is arranged on one side of the first limiting plate 443, which faces towards the right side plate. Meanwhile, by snapping the electrical connection wire connected to the fuse 5 into the open groove 444, the fuse 5 can be prevented from being released due to the swinging of the electrical connection wire.

In order to fix the PTC electric heater to the inside of the air duct of the indoor unit of the air conditioner, a second limiting plate 451 is protruded from the outer wall surface of the bottom wall 45 adjacent to the end wall, and a through hole 452 is formed in the second limiting plate 451 for fixing the PTC electric heater to the indoor unit of the air conditioner. Thus, the right base 4 can be fixed through the through hole 452 by a fastener such as a screw.

Referring to fig. 1, fig. 3 and fig. 4, a positioning column 33 is disposed on an end surface of the left base 3 away from the right base 4. In this way, when fixing the PTC electric heater, the positioning post 33 can be inserted into the positioning hole of the left plate of the air duct of the indoor unit of the air conditioner to achieve the pre-positioning, and then the screw is used to pass through the through hole 452 to fix the right base 4.

Further, the PTC electric heater further includes a temperature controller 6, and a second insertion hole 442 for accommodating the temperature controller 6 is opened on an end surface of the top wall 44 facing away from the left base 3.

In the present embodiment, similarly, the temperature controller 6 is provided to perform overheat protection on the PTC electric heater, and the temperature controller 6 is mounted on the right base 4 to facilitate the electrical connection between the temperature controller 6 and the heating bar (1,1').

Further, referring to fig. 1, 5 and 10, the ptc electric heater further includes a side cover 7, and the side cover 7 is fastened to an end of the right base 4 away from the left base 3.

In this embodiment, since the right base 4 is provided with the slot, air can enter the right base 4 through the slot, which may cause oxidation of the heating element on the one hand and decrease the insulation of the PTC electric heater on the other hand. By providing the side cover 7, a sealing function can be effectively performed.

Specifically, the outer wall surface of the side wall 46 is provided with a buckle 461 in a protruding manner adjacent to the end wall, and the side cover 7 is provided with a clamping hole 71 adapted to the buckle 461. In order to achieve positioning between the side cover 7 and the right base 4, the side face of the side cover 7 is annularly provided with a positioning flange 73. Preferably, in order to facilitate the routing or arrangement of the electrical connection wires, a wire pressing buckle 72 is disposed on a surface of the side cover 7 facing away from the right base 4.

Further, referring to fig. 1, fig. 2, fig. 12 and fig. 13, in an embodiment, two heat dissipation strips (2,2 ') are disposed between two adjacent heat bars (1,1 '), and a total width of the heat dissipation strip (2,2 ') between two adjacent heat bars (1,1 ') is greater than a width of the heat dissipation strip (2,2 ') located at two side edges.

In this embodiment, it can be understood that if the total width of the heat dissipation strip (2,2 ') between two adjacent heat generation strips (1,1 ') is equivalent to the width of the heat dissipation strip (2,2 ') located at two side edges, the heat dissipation area between two adjacent heat generation strips (1,1 ') is small, uniform heat dissipation is difficult to achieve, and the heating performance of the corresponding heat generation strip (1,1 ') cannot be fully exerted.

Furthermore, the heat dissipation structure further comprises a support plate 8 and two baffles 9, wherein the support plate 8 is arranged between the two adjacent heat dissipation strips (2, 2 '), and each heat dissipation strip (1,1 ') and each heat dissipation strip (2,2 ') are clamped between the two baffles 9.

In the embodiment, a plurality of radiating strips (2,2 ') are arranged between two adjacent heating strips (1,1 '), so that the problem that the single radiating strip (2,2 ') is too wide to cause difficulty in assembly or the radiating area is small when a wavy radiating fin is adopted can be avoided. Preferably, two heat dissipation strips (2,2 ') are arranged between two adjacent heat generation strips (1,1 '), the width of each heat dissipation strip (2,2 ') is equal, and therefore interchangeability of parts can be improved.

Further, the thickness of the supporting plate 8 is greater than that of the baffle 9, and the thickness range of the supporting plate 8 is as follows: 0.7 mm-1 mm, the thickness range of the baffle 9 is as follows: 0.5 mm-0.7 mm.

In this embodiment, by thickening the support plate 8, the support strength of the heat dissipation strip (2,2 ') between two adjacent heat dissipation strips (1,1 ') can be enhanced, and the heat dissipation strip (2,2 ') is prevented from being distorted and deformed during the process of mounting and dismounting. Preferably, the baffle 9 is provided with a plurality of convection holes to prevent the hot air flow from colliding with the baffle 9 to generate noise.

The invention further provides an air-conditioning indoor unit, which comprises the PTC electric heater, the specific structure of the PTC electric heater of the air-conditioning indoor unit refers to the above embodiments, and the air-conditioning indoor unit adopts all the technical schemes of all the above embodiments, so that the air-conditioning indoor unit at least has all the beneficial effects brought by the technical schemes of the above embodiments, and the details are not repeated herein.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims

1. A PTC electric heater of an air conditioner indoor unit is characterized by comprising:

the heat dissipation strips are fixed on two sides of the heating strips and connected with the outer wall surfaces of the side plates; the top surface of the heat dissipation strip is lower than the top plate, and the bottom surface of the heat dissipation strip is lower than the bottom plate;

the right base is fixed at the right ends of the heating strip and the heat dissipation strip;

the end face, deviating from the right base, of the left base is provided with a positioning column.

2. The PTC electric heater for an indoor unit of an air conditioner according to claim 1, wherein the right base has a right mounting hole fitted to right ends of the heat generating and dissipating bars, and both side wall surfaces opposite to the right mounting hole are respectively provided with a right insertion groove adapted to the top plate and the bottom plate;

the left base is provided with a left mounting hole sleeved with the left ends of the heating strip and the heat dissipation strip, and two side wall surfaces opposite to the left mounting hole are respectively provided with a left slot matched with the top plate and the bottom plate.

3. An electric PTC heater for an indoor unit of an air conditioner according to claim 2, wherein the right base includes an end wall, and a top wall and a bottom wall extending rightward from the edge of the end wall, and two side walls between the top wall and the bottom wall, and the end wall is provided with a plurality of through grooves through which electric connection wires of the heat generating strip are inserted.

4. The PTC electric heater for an indoor unit of an air conditioner according to claim 3, further comprising a fuse, wherein a first insertion hole for receiving the fuse is opened in an end surface of the top wall facing the left base.

5. The PTC electric heater for an indoor unit of an air conditioner as claimed in claim 3, further comprising a temperature controller, wherein a second insertion hole for receiving the temperature controller is formed in an end surface of the top wall facing away from the left base.

6. The PTC electric heater in an indoor unit of an air conditioner according to claim 3, further comprising a side cover that is snap-fitted to an end of the right base facing away from the left base.

7. A PTC electric heater for an indoor unit of an air conditioner according to claim 1, wherein two heat radiating strips are provided between adjacent two of the heat generating strips, and the total width of the heat radiating strips between adjacent two of the heat generating strips is larger than the width of the heat radiating strips at both side edges.

8. The PTC electric heater for an indoor unit of an air conditioner according to claim 7, further comprising a support plate and two blocking plates, wherein the support plate is disposed between two adjacent heat dissipation strips, and each of the heat dissipation strips and the heat dissipation strip is sandwiched between the two blocking plates.

9. The PTC electric heater for an indoor unit of an air conditioner according to claim 8, wherein the thickness of the supporting plate is greater than that of the baffle plate, and the thickness of the supporting plate ranges from: 0.7 mm-1 mm, the thickness range of the baffle plate is as follows: 0.5 mm-0.7 mm.

10. An indoor unit of an air conditioner, comprising the PTC electric heater according to any one of claims 1 to 9.