The present application claims priority to Chinese Patent Application Ser. No. CN201920379369.6, filed on Mar. 25, 2019, the entire disclosure of which is hereby incorporated herein by reference.
The present invention generally relates to a liquid heating device and in particular, the present invention relates to a PTC liquid heating device.
Currently, Positive Temperature Coefficient (“PTC”) liquid heating devices have been widely used in products such as SPA pools, amusement pools, water dispensers, and foot tubs. Existing PTC liquid heating devices generally include a PTC heating element and have a heat transfer structure. The heat transfer structure typically includes a very complex structure, thereby having disadvantages such as a low heat transfer rate and uneven heat transfer.
An object of the present invention is to solve the above problems in the existing PTC liquid heating devices and to provide a PTC liquid heating device wherein heat generated by a PTC heating element can be uniformly and efficiently transferred.
It is one aspect of the present invention to provide a PTC liquid heating device. The PTC liquid heating device comprise a housing extending along a longitudinal axis and defining a liquid inlet and a liquid outlet. A PTC heating unit is inserted into the housing and extends along the longitudinal axis. The PTC heating unit includes a sleeve, a heat conductor and at least one PTC heating core. The heat conductor has a pair of metal profiles defining at least one chamber. The at least one chamber extends along the longitudinal axis to receive the at least one PTC heating core. The heat conductor is located in the sleeve and has a shape matching the sleeve.
According to an embodiment of the present invention, the at least one chamber can define a first chamber and a second chamber. The first chamber can be located on a metal profile of the pair of metal profiles and extend along the longitudinal axis. The second chamber can be located between the pair of metal profiles and extend along the longitudinal axis.
According to an embodiment of the present invention, the at least one PTC heating core can comprise a pair of PTC heating cores located in the first chamber.
According to an embodiment of the present invention, the PTC liquid heating device can include a thermally conductive material located in the second chamber to improve heat transfer.
According to an embodiment of the present invention, the at least one PTC heating core can be located between the pair of metal profiles.
According to an embodiment of the present invention, the PTC liquid heating device can include an insulating layer located between the heat conductor and the sleeve. The insulating layer can extend about the heat conductor.
According to an embodiment of the present invention, the sleeve can have a generally cylindrical shape, and each metal profile of the pair of metal profiles can have a generally semi-cylindrical shape.
According to an embodiment of the present invention, the sleeve can be made from a corrosion resistant and thermally conductive material.
According to an embodiment of the present invention, the housing can comprise a housing body, a cover, a first baffle, and a second baffle. The housing body can extend between a first longitudinal end of the housing body and a second longitudinal end of the housing body. The first longitudinal end can define a first through hole and the second longitudinal end can define an opening. The cover can be detachably coupled to the second longitudinal end of the housing body to cover the opening of the housing body. The cover can define a first aperture. The first baffle can be detachably coupled to the first longitudinal end of the housing body. The first baffle can define a first bore in communication with the first through hole. The second baffle can be detachably coupled to the cover. The second baffle can define a first orifice in communication with the first aperture of the cover. The PTC heating unit can be inserted into the housing along the longitudinal axis and through the first through hole, the first aperture, the first bore and the first orifice. A stopper can be provided at an edge of the first aperture and at an edge of the first orifice to limit movement of the PTC heating unit along the longitudinal axis.
According to an embodiment of the present invention, the PTC liquid heating device can include a pair of flow guiding members located at opposite sides of the PTC heating unit. The pair of flow guiding members can be provided on an inner surface of the housing and extend from the first longitudinal end of the housing body along the longitudinal axis. The liquid inlet and the liquid outlet can be provided on the housing body and adjacent to the first longitudinal end of the housing body. Each flow guiding member of the pair of flow guiding members can have a length less than a distance between the first longitudinal end of the housing body and the cover. The pair of flow guiding members can fit against the PTC heating unit.
It is another aspect of the present invention to provide a PTC liquid heating device. The PTC liquid heating device comprises a housing extending along a longitudinal axis and defining a liquid inlet and a liquid outlet. A PTC heating unit is inserted into the housing and extends along the longitudinal axis. The PTC heating unit includes a PTC ceramic sheet, a pair of electrodes, a first insulating layer, and a first sleeve. The PTC ceramic sheet is located between the pair of electrodes. The first insulating layer extends about the pair of electrodes and the PTC ceramic sheet. The first sleeve extends about the first insulating layer. Each electrode of the pair of electrodes has a shape matching with a shape of the first sleeve.
According to an embodiment of the present invention, the PTC liquid heating device can include a second sleeve, located adjacent to the first sleeve and extending about the first sleeve.
According to an embodiment of the present invention, the first sleeve and the second sleeve can be made from a metallic material. The first sleeve can be made from aluminum. The second sleeve can be made from stainless steel.
According to an embodiment of the present invention, each of the first sleeve and the second sleeve can have a thickness of between 0.3 mm-1.2 mm.
According to an embodiment of the present invention, each of the first sleeve and the second sleeve can have a thickness of 0.5 mm.
According to an embodiment of the present invention, the PTC liquid heating device can include a second insulating layer located between the first sleeve and the second sleeve, the second insulating layer extending about the first sleeve.
According to an embodiment of the present invention, the PTC liquid heating device can include a protective layer comprising a metal foil located between the first insulating layer and the first sleeve and extending about the first insulating layer.
According to an embodiment of the present invention, the protective layer can have a thickness of between 0.02 mm and 0.06 mm.
According to an embodiment of the present invention, the protective layer can have a thickness of 0.04 mm.
According to an embodiment of the present invention, the PTC liquid heating device can include a second insulating layer located between the protective layer and the first sleeve. The second insulating layer can extend about the protective layer.
According to an embodiment of the present invention, the first sleeve can have a generally cylindrical shape, and each electrode of the pair of electrodes has a generally semi-cylindrical shape.
According to an embodiment of the present invention, the housing can comprise a housing body, a cover, a first baffle, and a second baffle. The housing body can extend between a first longitudinal end of the housing body and a second longitudinal end of the housing body. The first longitudinal end can define a first through hole. The second longitudinal end can define an opening. The cover can be detachably coupled to the second longitudinal end of the housing body to cover the opening of the housing bod. The cover can define a first aperture. The first baffle can be detachably coupled to the first longitudinal end of the housing body. The first baffle can define a first bore in communication with the first through hole. The second baffle can be detachably coupled to the cover. The second baffle can define a first orifice in communication with the first aperture of the cover. The PTC heating unit can be inserted into the housing along the longitudinal axis and through the first through hole, the first aperture, the first bore and the first orifice.
According to an embodiment of the present invention, the PTC liquid heating device can further include a stopper provided at an edge of the first aperture and at an edge of the first orifice to limit movement of the PTC heating unit along the longitudinal axis.
According to an embodiment of the present invention, the housing can comprise a housing body, a cover, and a flange. The housing body can have a first longitudinal end of the housing body and a second longitudinal end of the housing body. The first longitudinal end can be closed. The second longitudinal end can define an opening. The cover can be detachably coupled to the second longitudinal end of the hosing body to cover the opening of the housing body. The cover can define a first aperture. The flange can be detachably coupled to the cover. The flange can define a first bore in communication with the first aperture. The PTC heating unit can be inserted into the housing along the longitudinal axis and through the first bore and the first aperture. The PTC heating unit can be coupled to the flange via welding.
According to an embodiment of the present invention, the housing can comprise housing body and a flange. The housing body can have a first longitudinal end of the housing body and a second longitudinal end of the housing body. The first longitudinal end can be closed. The second longitudinal end can define an opening. The flange can be detachably connected to the second longitudinal end of the housing body to cover the opening of the housing. The flange can define a first bore. The PTC heating unit can be inserted into the housing along the longitudinal axis through the first bore. The PTC heating unit can be coupled to the flange via welding.
The heat transfer structure of the PTC liquid heating device constructed in accordance with embodiments of the present invention can provide uniform and efficient heat transfer. In addition, the PTC liquid heating device has improved corrosion resistance and insulation properties, thereby prolonging the service life of the PTC liquid heating device.
Other features and advantages of the present invention will be better understood from the alternative embodiments described in detail with reference to the accompany drawings, in which the same reference numerals identify the same or similar components.
The implementation and usage of the embodiments will be discussed in detail below. However, it should be understood that specific embodiments discussed herein are merely illustrative of specific ways to implement and use the present invention and do not limit the scope of the present invention. In the description regarding the structural positions of various components, representations of directions such as “upper”, “lower”, “top” and “bottom” are not absolute, but relative. When various components are arranged as shown in the drawings, these representations of directions are appropriate. However, when the positions of the various components in the drawings are changed, these representations of directions shall be changed accordingly. Accordingly, a PTC liquid heating device extending along a lengthwise direction can be defined as extending along a longitudinal axis A, as shown by way of example in
Referring to
The housing 104 includes a first baffle 120 and a second baffle 122 for limiting movement of the PTC heating unit 102 along the longitudinal axis A. The first baffle 120 is detachably coupled to the first longitudinal end 110 of the housing body 106. The first baffle 120 defines a first bore 124 in communication with the first through hole 112 of the first longitudinal end 110 of the housing body 106. The second baffle 122 is detachably coupled to the cover 108. The second baffle 122 defines a first orifice 126 in communication with the first aperture 118 of the cover 108. A stopper 128 may be provided at an edge of the first bore 124 of the first baffle 120 (as best shown in
The housing 104 includes a pair of first seals 132 and a second seal 134. A first seal 132 of the pair of first seals 132 is located between the first through hole 112 and the PTC heating unit 102. Another first seal 132 of the pair of first seals 132 is located between the first aperture 118 of the cover 108 and the PTC heating unit 102. The second seal 134 is located between the second longitudinal end 114 of the housing body 106 and the cover 108.
As shown in
The heat conductor 148 defines at least one chamber 154, 162 extending along the longitudinal axis A for receiving the at least one PTC heating core 150. It should be appreciated that the heat conductor 148 may be made of a metal with high thermal conductivity, such as but not limited to aluminum or copper. According to an embodiment of the present invention, the heat conductor 148 includes a pair of metal profiles 152 opposite with respect to one another and located inside the sleeve 146. The pair of metal profiles 152 define the at least one chamber 154, 162, extending along the longitudinal axis A. The at least one chamber 154, 162 includes a first chamber 154 and a second chamber 162. The first chamber 154 is located on a metal profile 152 of the pair of metal profiles 152 and extends along the longitudinal axis A. According to an embodiment of the present invention, each metal profile 152 of the pair of metal profiles 152 has a semi-cylindrical shape and includes a first side portion 156 (at the cylindrical surface side) and a second side portion 158 opposite with respect to the first side portion 156. An inner surface of the sleeve 146 is at least partially in contact with an outer surface of the first side portion 156 of the metal profile 152 to provide effective heat transfer performance. The second side portion 158 of the metal profile 152 defines a groove 160, extending along the longitudinal axis A. The two metal profiles 152 are coupled to one another, and the grooves 160 of the second side portions 158 of the two metal profiles 152 are aligned to form the second chamber 162, extending along the longitudinal axis A. The second chamber 162 can be filled with a thermally conductive material, such as alumina powder or a thermally conductive adhesive to improve heat transfer performance.
According to an embodiment of the present invention, the PTC heating core 150 includes a PTC ceramic sheet 164, a pair of electrodes 166, a first insulating layer 168, a protective layer 170, and a second insulating layer 172. The pair of electrodes 166, spaced apart from one another, are made of a material with high electrical conductivity and thermal conductivity, such as but not limited to aluminum or copper. The PTC ceramic sheet 164 is located between the pair of electrodes 166. The first insulating layer 168, the protective layer 170, and the second insulating layer 172 extend about the PTC ceramic sheet 164 and the pair of electrodes 166. It should be appreciated that each layer of the first insulating layer 168 or the second insulating layer 172 can include at least one layer of insulating film. According to an embodiment of the present embodiment, the first insulating layer 168 includes four layers of insulating film, while the second insulating layer 172 includes two layers of insulating film. The insulating film may be an imine film. The protective layer 170 is disposed between the first insulating layer 168 and the second insulating layer 172. The protective layer 170 is a thin metal sheet made from a metal with high thermal conductivity to prevent the insulating layers from being pierced by solid particles. It should be appreciated that the PTC ceramic sheet 164, the electrodes 166, the first insulating layer 168, the protective layer 170, and the second insulating layer 172 are in close contact with each other to provide effective heat transfer.
The sleeve 146′ has a generally cylindrical shape and is adapted to receive the PTC heating core 150′ and the heat conductor 148′. It should be appreciated that the sleeve 146′ can be made from a material with high thermal conductivity and corrosion resistance, such as but not limited to stainless steel.
The heat conductor 148′ defines a chamber 162′, extending along the longitudinal axis A for receiving the PTC heating core 150′. The heat conductor 148′ can be made from a metal with high thermal conductivity, such as but not limited to aluminum or copper. The heat conductor 148′ includes a pair of metal profiles 152′ opposite of one another inside the sleeve 146′. Each metal profile 152′ of the pair of metal profiles 152′ has a semi-cylindrical shape and includes a first side portion 156′ (at the cylindrical surface side) and a second side portion 158′ opposite of the first side portion 156′. According to an embodiment of the present invention, an inner surface of the sleeve 146′ is at least partially in contact with an outer surface of the first side portion 156′ of the metal profile 152′ to provide effective heat transfer performance. The second side portion 158′ of the metal profile 152′ defines a groove 160′, extending along the longitudinal axis A. The pair of metal profiles 152′ are coupled to one other, and the grooves 160′ of the second side portions 158′ of the two metal profiles 152′ are aligned to form the chamber 162′, extending therebetween. The PTC heating core 150′ is located in the chamber 162′.
The PTC heating core 150′ of the PTC heating unit 102′ has substantially the same structure as that of the PTC heating core 150 shown in
The PTC heating core 150″ in the PTC heating unit 102″ has substantially the same structure as the PTC heating core 150 of the PTC heating unit 102 shown in
The housing 204 includes a first baffle 220 and a second baffle 222 for limiting movement of the PTC heating units 202 along the longitudinal axis A. The first baffle 220 is detachably coupled to the first longitudinal end 210 of the housing body 206. The first baffle 220 defines a first bore 224 in communication with the first through hole of the first longitudinal end 210 of the housing body 206. As shown in
The housing 204 includes a plurality of first seals 232 and a second seal 234. Two first seals 232 of the plurality of first seals 232 are located between the first through holes of the first longitudinal end 210 of the housing body 206 and the PTC heating units 202. Another two first seals 232 of the plurality of first seals 232 are located between the first apertures 218 and the PTC heating units 202. The second seal 234 is located between the second longitudinal end 214 of the housing body 206 and the cover 208.
As shown in
As shown in
The housing 304 includes a housing body 306 and a cover 308. The housing body 306 has a generally cylindrical shape and a generally circular-shaped cross-section. The housing body 306 extends between a first longitudinal end 310 and a second longitudinal end 314. The first longitudinal end 310 of the housing body 306 defines a first through hole (not shown, one for each PTC hearing unit 302). The second longitudinal end 314 defines an opening 316. The cover 308 is detachably coupled to the second longitudinal end 314 of the housing body 306 to cover the opening 316 of the housing body 306. The cover 308 defines a plurality of first apertures 318, wherein the plurality of apertures 318, are in communication with the opening 316.
The housing 304 includes a first baffle 320 and a second baffle 322 to limit movement of the PTC heating units 302 along the longitudinal axis A. The first baffle 320 is detachably coupled to the first longitudinal end 310 of the housing body 306. The first baffle 320 defines a plurality of first bores 324 in respective communication with corresponding first through holes (not shown). The second baffle 322 is detachably coupled to the cover 308. The second baffle 322 defines a plurality of first orifices 326, wherein each first orifice 326 of the plurality of first orifices 326 is in communication with a corresponding first aperture 318 of the plurality of first apertures 318. According to an embodiment of the present invention, the first through holes of the first longitudinal end 310 of the housing body 306, the plurality of first apertures 318, the plurality of first bores 324, and the plurality of first orifice 326 of the second baffle 322 each have a shape that matches with the shape of the PTC heating units 302. According to an embodiment of the present invention, there are four of the first apertures 318 in the cover 308, four of the first bores 324 in the first baffle 320, and four of the first orifices 326 in the second baffle 322. Each PTC heating unit 302 of the plurality of PTC heating units 302 is inserted into the housing 304 along the longitudinal axis A through a corresponding first bore 324 in the first baffle 320, a corresponding first through hole of the first longitudinal end 310 of the housing body 306, a corresponding first aperture 318 in the cover 308, and a corresponding first orifice 326 in the second baffle 322.
The housing 304 includes a plurality of first seals 332 and a second seal 334. Each first seal 332 of the plurality of first seals 332 is located between a corresponding first through hole of the first longitudinal end 310 of the housing body 306 and a corresponding PTC heating units 302. In addition, each first seal 332 of the plurality of first seals 332 is located between a corresponding first aperture 318 in the cover 308 and a corresponding PTC heating unit 302. The second seal 334 is located between the second longitudinal end 314 of the housing body 306 and the cover 308.
As best shown in
The housing 404, extending along a longitudinal axis A, includes a housing body 406 and a cover 408. The housing body 406 has a generally cylindrical shape and a generally rectangular-shaped cross-section. The housing body 406 extends between a first longitudinal end 410 and a second longitudinal end 414, wherein the first longitudinal end 410 of the housing body 406 is closed and the second longitudinal end 414 defines an opening 416. The cover 408 is detachably coupled to the second longitudinal end 414 of the housing body 406 to cover the opening 416 of the housing body 406. The cover 408 defines a plurality of first apertures 418. The housing 404 includes a flange 417 detachably coupled to the cover 408. The flange 417 defines a plurality of first through holes 419, wherein each first through hole 419 of the plurality of first through holes 419 is in communication with a corresponding first aperture 418 of the plurality of first apertures 418 in the cover 408. It should be appreciated that each first aperture 418 of the plurality of first apertures 418 and each first through hole 419 of the plurality of first through holes 419 has a shape that matches with the shape of a corresponding PTC heating unit 402. According to an embodiment of the present invention, each PTC heating unit 402 of the plurality of PTC heating units 402 is inserted into the housing 404 along the longitudinal axis A through a corresponding first through hole 419 of the plurality of first through holes 419 and a corresponding first aperture 418 of the plurality of first apertures 418. It should be appreciated that, according to an embodiment of the present invention, the PTC heating units 402 may be coupled to the flange 417 by welding.
The housing 404 includes a plurality of first seals 432 and a second seal 434. Each first seal 432 of the plurality of first seals 432 is located between a corresponding first aperture 418 of the plurality of first apertures 418 of the cover 408 and a corresponding PTC heating unit 402 of the plurality of PTC heating units 402. The second seal 434 is located between the second longitudinal end 414 of the housing body 406 and the cover 408.
The housing body 406 of the housing 404 defines a liquid inlet 436 and a liquid outlet 438. According to an embodiment of the present invention, the liquid inlet 436 and the liquid outlet 438 are located adjacent to the first longitudinal end 410 of the housing body 406. A flow guiding member 440 is located inside the housing body 406. The flow guiding member 440 has a generally rectangular shape and extends from the first longitudinal end 410 of the housing body 406 along the longitudinal axis A. Both ends of the flow guiding member 440 lie along a transverse direction and are respectively coupled to the housing body 406. According to an embodiment of the present invention, the flow guiding member 440 can be integrally formed with the housing body 406 and there is a plurality of four PTC heating units 402 located in the housing body 406, wherein two PTC heating units 402 of the plurality of four PTC heating units 402 are separated from the other two PTC heating units 402 of the plurality of four PTC heating unit 402 by the flow guiding member 440. It should be appreciated that the flow guiding member 440 can have a length less than a distance between the first longitudinal end 410 of the housing body 406 and the cover 408. Each PTC heating unit 402 of the plurality of PTC heating units 402 of the PTC liquid heating device 400 can have the same structure as that of the PTC heating unit 202 of the PTC liquid heating device 200, as illustrated in
The housing 504, extending along a longitudinal axis A, includes a housing body 506 and a flange 517. The housing body 506 has a generally cylindrical shape and a generally rectangular shaped cross-section. The housing body 506 extends between a first longitudinal end 510 and a second longitudinal end 514, wherein the first longitudinal end 510 of the housing body 506 is closed and the second longitudinal end 514 defines an opening 516. The flange 517 is detachably coupled to the second longitudinal end 514 of the housing body 506 to cover the opening 516 of the housing body 506. The flange 517 defines a plurality of first through holes 519 in communication with the opening 516. It should be appreciated that each first through hole 519 of the plurality of first through holes 519 can have a shape that matches with the shape of a corresponding PTC heating unit 502. According to an embodiment of the present invention, each PTC heating unit 502 of the plurality of PTC heating units 502 is inserted into the housing 504 along the longitudinal axis A through a corresponding first through hole 519 of the plurality of first through holes 519. It should be appreciated that, according to an embodiment of the present invention, the PTC heating units 502 may be coupled to the flange 517 by welding. The housing 504 also includes a seal 533 disposed between the second longitudinal end 514 of the housing body 506 and the flange 517.
As best shown in
The housing 604, extending along a longitudinal axis A, includes a housing body 606, a flange 617, and a pair of rectangular tubes 621. The housing body 606 has a generally rectangular-shaped cross-section. The housing body 606 extends between a first longitudinal end 610 and a second longitudinal end 614, wherein the first longitudinal end 610 of the housing body 606 is closed and the second longitudinal end 614 defines an opening 616. The flange 617 is detachably coupled to the second longitudinal end 614 of the housing body 606 to cover the opening 616 of the housing body 606. The rectangular tubes 621 couples with the flange 617 via welding. The rectangular tubes 621, at least partially positioned within the housing body 606, are spaced apart from one another and extending along the longitudinal axis A. The PTC heating core 650 each have a generally rectangular shape and are inserted into respective rectangular tubes 621 to transfer heat to the liquid via the rectangular tube 621. The housing 604 includes a seal 633 located between the second longitudinal end 614 of the housing body 606 and the flange 617.
The housing body 606 of the housing 604 defines a liquid inlet 636 and a liquid outlet 638. According to an embodiment of the present invention, the liquid inlet 636 and the liquid outlet 638 are located adjacent to the first longitudinal end 610 of the housing body 606. A flow guiding member 640 is located inside of the housing body 606. The flow guiding member 640 has a generally rectangular shape and extends from the first longitudinal end 610 of the housing body 606 along the longitudinal axis A. Both ends of the flow guiding member 640 lie in a transverse direction and are coupled to the housing body 606. According to an embodiment of the present invention, the flow guiding member 640 can be integrally formed with the housing body 606 and there is a pair of PTC heating cores 650 located in the housing body 606, wherein each PTC heating core 650 of the pair of PTC heating cores 650 is separated from the other PTC heating core 650 of the pair of PTC heating cores 650 by the flow guiding member 640. It should be appreciated that the flow guiding member 640 can have a length less than a distance between the first longitudinal end 610 of the housing body 606 and the flange 617. Each PTC heating core 650 of the pair of PTC heating cores 650 of the PTC liquid heating device 600 has the same structure as that of the PTC heating unit 150, as illustrated in
It should be appreciated that any gap between the components of the PTC heating unit or the PTC heating core 650, according to embodiments the present invention, may be filled with a thermally conductive material, such as alumina powder or thermally conductive adhesive to further improve heat transfer efficiency.
The housing 704, extending along a longitudinal axis A, includes a housing body 706 and a cover 708. The housing body 706 has a generally rectangular shape. The housing body 706 extends between a first longitudinal end 710 and a second longitudinal end 714. The first longitudinal end 710 of the housing body 706 defines a plurality of first through holes (not shown). The second longitudinal end 714 defines an opening 716 in communication with the first through holes. The cover 708 is detachably coupled to the second longitudinal end 714 of the housing body 706 to cover the opening 716 of the housing body 706. The cover 708 defines a plurality of first apertures 718 in communication with the opening 716.
The housing 704 includes a baffle 720 detachably coupled to the first longitudinal end 710 of the housing body 706. The baffle 720 defines a plurality of first bores 724 in communication with the first through holes of the first longitudinal end 710 of the housing body 706. According to an embodiment of the present invention, each first bore 724 of the plurality of first bores 724 and each first aperture 718 of the plurality of first apertures 718 can have a shape that matches with the shape of a corresponding PTC heating unit of the plurality of PTC heating units 702. According to an embodiment of the present invention, the plurality of first apertures 718 includes a plurality of four first apertures 718, and the plurality of first bores 724 includes a plurality of four first bores 724. Each PTC heating unit 702 of the plurality of the plurality of PTC heating units 702 is inserted into the housing 704 along the longitudinal axis A through a corresponding the first bore 724 in the baffle 720 and a corresponding first aperture 718 in the cover 708.
A flange 717 is detachably coupled to the second longitudinal end 714 of the housing body 706 to cover the opening 716 of the housing body 706. The flange 717 defines a plurality of first through holes 719. It should be appreciated that each first through hole 719 of the plurality of first through holes 719 has a shape that matches with the shape of a corresponding PTC heating unit 702. According to an embodiment of the present invention, each PTC heating unit 702 of the plurality of PTC heating units 702 is inserted into the housing 704 along the longitudinal axis A through a corresponding first through hole 719 of the plurality of first through holes 719. It should be appreciated that, according to an embodiment of the present invention, the PTC heating units 702 may be coupled to the flange 717 by welding.
The housing 704 includes a plurality of first seals 732 and a second seal 734. Each first seal 732 of the plurality of first seals 732 is located between a corresponding first bore 724 of the plurality of first bores 724 of the baffle 720 and a corresponding PTC heating units 702. In addition, each first seal 732 of the plurality of the first seals 732 is located between a corresponding first aperture 718 of the cover 708 and flange 717. The second seal 734 is located between the second longitudinal end 714 of the housing body 706 and the cover 708.
As best shown in
It should be understood that the embodiments shown in
The technical content and technical features of the present invention have been disclosed above. However, it should be understood that those skilled in the art can make various variations and improvements to the above disclosed concepts under the inventive idea of the present invention, and all these variations and improvements belong to the scope of protection of the present invention. The description for the above embodiments is illustrative and not restrictive, and the scope of protection of the present invention is determined by the claims.
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201920379369.6 | Mar 2019 | CN | national |
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Number | Date | Country | |
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20200314968 A1 | Oct 2020 | US |