Automotive water heater

Abstract

An automotive water heater having application to a windshield of an automobile, which is able to produce hot water that can be sprinkled on the windshield to melt accumulated snow and frost, in which a water heater is mainly structured from a laminated assembled heating unit side joined to a heat conducting surface of an exchange bed. Heat quantity produced by the heating unit forms a heat balance function, which transfers the heat to the exchange bed, and water flow paths are defined interior of the exchange bed. The face joining of the laminated heating units is used to facilitate maintenance of component members and allow changing of the number of heating units assembled to the exchange bed, thereby providing choice to accommodate different power requirements.

1 . An automotive water heater, applying to a windshield of an automobile, and producing hot water that is sprinkled on the windshield to melt snow and frost, comprising:
 a laminated heating unit, electrical property is conducted by means of a heating strip joined to plate electrodes, and outwardly separated by an insulating plate, a front end of the heating unit is joined to a heat conducting surface of an exchange unit, and a rear end of the heating unit is sealed with a sealing back plate;   the exchange unit comprising an exchange bed, an outer surface of which is configured with the heat conducting surfaces, water flow paths are defined interior of the exchange bed, and front and rear ends of the exchange bed are respectively sealed with seal end covers, pipe orifices which enable water to flow in and out thereof are located at one of the seal end covers.   
   
   
       2 . The automotive water heater according to  claim 1 , wherein a periphery of the exchange bed is configured with a plurality of adjacent and mutually facing heat conducting surfaces, thereby enabling more than two sets of the heating units to be joined thereto. 
   
   
       3 . The automotive water heater according to  claim 1 , wherein a heating strip is disposed at a joining interface between the heating unit and the exchange bed, and the heating unit is outwardly serial-joined to a positive plate electrode and an insulating plate; the heating strip directly contacts the exchange bed by means of a negative electrode, and the exchange bed outwardly conducts to a system earth. 
   
   
       4 . The automotive water heater according to  claim 3 , wherein an electric conducting buffer layer separates the heating unit from a corresponding heat conducting surface of the exchange bed. 
   
   
       5 . The automotive water heater according to  claim 1 , wherein two opposite surfaces of the heating strip of the heating unit are respectively serial-joined to positive and negative electrode plates and to the insulating plate. 
   
   
       6 . The automotive water heater according to  claim 5 , wherein the buffer layer separates the heating unit and the corresponding heat conducting surface of the exchange bed. 
   
   
       7 . The automotive water heater according to  claim 1 , wherein ribbed plates are located interior of the exchange bed at flow path positions corresponding to areas of the heat conducting surface of the exchange bed; the ribbed plates enable forming water flow paths, and have heat conducting property. 
   
   
       8 . The automotive water heater according to  claim 1 , wherein a buffer device is interposed between the heating unit and the sealing back plate. 
   
   
       9 . The automotive water heater according to  claim 8 , wherein the buffer device is a flexible plastic body. 
   
   
       10 . The automotive water heater according to  claim 9 , wherein the buffer device is a flexible plastic body including silica gel. 
   
   
       11 . The automotive water heater according to  claim 8 , wherein the buffer device is a metallic spring strip. 
   
   
       12 . The automotive water heater according to  claim 1 , wherein the heating strip is a positive temperature coefficient ceramic resistance strip. 
   
   
       13 . The automotive water heater according to  claim 1 , wherein the heating strip is an electric heating wire having electrothermal resistance function. 
   
   
       14 . The automotive water heater according to  claim 1 , wherein a compression plate is used to compress join the sealing back plates to the exchange bed. 
   
   
       15 . The automotive water heater according to  claim 1 , wherein an agglutinating agent is used to join the sealing back plates to the exchange bed. 
   
   
       16 . The automotive water heater according to  claim 1 , wherein a gluing agent is used between each component member of the laminated heating unit to realize the joining connection therebetween. 
   
   
       17 . The automotive water heater according to  claim 1 , wherein an aluminum oxide plate is preferred as the insulating plate.