KR20180005433A - Cooling-water heater - Google Patents

Abstract

The present invention relates to a cooling water heater. In a cooling water heater for heating a heating element using an induction heating method, the cooling water flows from the lower side to the upper side while being in contact with the heating element and is discharged to the upper side. Which can prevent overheating of the heating element and can prevent the heating element and the surrounding components from overheating by sufficiently controlling the flow distribution of the cooling water while maintaining a sufficient distance between the bobbin and the heating element which is a structure for winding and fixing the induction coil, Heater.

Description

Cooling-water heater

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water heater, and more particularly, to a cooling water heater capable of improving bubble discharge of cooling water in a cooling water heater in which a heating element is heated by an induction heating method and preventing overheating of a heating element and an induction coil.

Vehicles powered by engines powered by gasoline, diesel, and other energy sources are currently the most common form of vehicles, but these automotive energy sources are in need of new sources of energy due to various causes such as environmental pollution problems as well as reduced oil reserves. Electric cars, hybrid cars, and fuel cell vehicles are currently being put to practical use or being developed.

However, in an electric vehicle, a hybrid car, and a fuel cell vehicle, a heating system using cooling water can not be applied or applied, unlike a conventional vehicle using an engine using an oil as an energy source. That is, in the case of a conventional vehicle using an engine using an oil as an energy source as the driving source, a lot of heat is generated in the engine, a cooling water circulation system for cooling the engine is provided, . However, since such a large amount of heat as that generated by the engine does not occur in the electric vehicle, the hybrid car, and the drive source of the fuel cell vehicle, there is a limit to the use of this conventional heating system.

Accordingly, various studies have been made on electric vehicles, hybrid cars, and fuel cell vehicles by adding a heat pump to the air conditioning system and using it as a heat source, or by providing a separate heat source such as an electric heater have. Among them, the electric heater can heat the cooling water more easily without greatly affecting the air conditioning system, and is now widely used.

Here, the electric heater includes an air-heated heater that directly heats the air blown into a vehicle room, and a coolant-heated heater (or a coolant heater) that heats the coolant.

A conventional induction type cooling water heater used in a dual fuel cell vehicle to heat the cooling water has a structure in which a high frequency generator 30 is electrically connected to a fuel cell stack 10 that produces power as shown in FIGS. 1 and 2, (30) is formed in the form of a coil wound on the outer side of a cooling water flow pipe (2) made of a metallic material, and is formed by a magnetic field which changes when alternating current flows in the induction coil (31) An eddy current is generated in the cooling water flow pipe 2 and thereby the cooling water flow pipe 2 can be heated in the joule heat so that the cooling water passing through the inside of the cooling water flow pipe 2 can be heated.

However, in the conventional induction type cooling water heater, bubbles are generated as the cooling water flowing into the inlet comes into contact with the heating element, and thus the flow resistance of the cooling water is increased by blocking the flow of the cooling water flowing as the bubbles float upward, .

In addition, since the flow distribution of the cooling water is lowered, the cooling of the heating element is disadvantageous and the parts around the heating element or the heating element may be overheated.

KR 2011-0075118 A1 (July 6, 2011)

It is an object of the present invention to provide a cooling water heater for heating a heating element by using an induction heating method and to prevent bubbles from being discharged from the cooling water, The present invention provides a cooling water heater capable of sufficiently preventing a heating element and surrounding components from being overheated by controlling the flow distribution of the cooling water while maintaining a sufficient distance between the bobbin and the heating element as a structure for winding and fixing the induction coil.

In order to achieve the above object, a cooling water heater (1000) of the present invention comprises a body (100); A housing 200 coupled to a side surface of the body 100; The body 100 and the housing 200 are provided in an inner space formed by the coupling of the body 100 and the housing 200. The body 100 and the housing 200 are spaced apart from the upper and lower ends of the inner space, An upper header 400 and a lower header 500 coupled to any one or more of the plurality of lower header 400; A bobbin 600 formed into a cylindrical shape and coupled so that both open ends thereof are supported by the upper header 400 and the lower header 500; An induction coil 300 wound around the bobbin 600; And a heating element 310 which is formed in a cylindrical shape and is open at its both ends so as to be supported by the upper header 400 and the lower header 500 and spaced apart from the inside of the bobbin 600; The cooling water flowing into the inlet pipe 210 formed on the lower side of the housing 200 flows into the cooling water inflow hole 510 and the heating element 310 of the lower header 500 and the lower header 500, The cooling water discharge hole 410 of the upper header 400 and the upper side of the upper header 400 to be discharged through the outlet pipe 220 formed on the upper side of the housing 200 .

A guide groove 110 is formed in the body 100 to be concave in the horizontal direction on the concave inner side so that the upper header 400 and the lower header 500 are inserted and coupled along the guide groove 110 .

The upper and lower headers 400 and 500 may be inserted into the fixing groove 230 so that the upper header 400 and the lower header 500 may be coupled to each other. have.

The cooling water inflow hole 410 formed in the upper header 400 and the cooling water inflow hole 510 formed in the lower header 500 are formed on the inner side of the bobbin 600 when viewed from the upper side or the lower side, The outer circumferential surface of the heating body 310 may be formed radially inward of the outer circumferential surface of the heating body 310 with reference to a position spaced apart from the bobbin 600.

The cooling water inflow hole 410 formed in the upper header 400 and the cooling water inflow hole 510 formed in the lower header 500 are formed in the inner region and the outer region of the heating element 310 when viewed from the upper side or the lower side, .

The upper header 400 and the lower header 500 may include a flow regulator 530 that blocks a portion of the inner region of the heating element 310 when viewed from the upper side or the lower side.

The bobbin 600 may have coil supporting portions 620 formed at the upper and lower ends of the bobbin 600 in a radially outward direction from the outer circumferential surface of the cylindrical portion 610.

The bobbin 600 has a protruding portion 630 protruding from the coil supporting portion 620 in the height direction so that the protruding portion 630 is inserted into the bobbin coupling holes 440 and 540 formed in the headers 400 and 500 Can be inserted and combined.

The upper header 400 and the lower header 500 may be formed with bobbin guide grooves 450 and 550 in which the coil support portions 620 of the bobbin 600 are inserted.

The upper header 400 and the lower header 500 may be formed with heating element coupling grooves 460 and 560 through which the ends of the heating element 310 are inserted and coupled to each other.

The cooling water heater of the present invention improves the bubble discharging property of the cooling water, and can prevent the heating element from overheating.

Further, the distance between the bobbin and the heating element can be sufficiently separated, and the flow of the cooling water can be adjusted smoothly, thereby preventing overheating of the heating element and surrounding components.

1 and 2 are a schematic view and a sectional view showing a conventional cooling water heater;
3 and 4 are an assembled perspective view and an exploded perspective view of the cooling water heater of the present invention.
5 and 6 are an exploded perspective view and an assembled perspective view showing a coupling structure of an upper header, a lower header, a bobbin, an induction coil, and a heating element according to the present invention.
7 is a cross-sectional view showing a coolant heater of the present invention.
8 is a partial cross-sectional view showing a flow region of cooling water according to the present invention.

Hereinafter, a cooling water heater according to the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.

FIGS. 3 and 4 are an assembled perspective view and an exploded perspective view showing a cooling water heater according to the present invention, FIGS. 5 and 6 are an exploded perspective view showing a coupling structure of an upper header, a lower header, a bobbin, an induction coil, FIG. 7 is a cross-sectional view showing a cooling water heater according to the present invention. FIG.

The cooling water heater 1000 according to an embodiment of the present invention includes a body 100; A housing 200 coupled to a side surface of the body 100; The body 100 and the housing 200 are provided in an inner space formed by the coupling of the body 100 and the housing 200. The body 100 and the housing 200 are spaced apart from the upper and lower ends of the inner space, An upper header 400 and a lower header 500 coupled to any one or more of the plurality of lower header 400; A bobbin 600 formed into a cylindrical shape and coupled so that both open ends thereof are supported by the upper header 400 and the lower header 500; An induction coil 300 wound around the bobbin 600; And a heating element 310 which is formed in a cylindrical shape and is open at its both ends so as to be supported by the upper header 400 and the lower header 500 and spaced apart from the inside of the bobbin 600; The cooling water flowing into the inlet pipe 210 formed on the lower side of the housing 200 flows into the cooling water inflow hole 510 and the heating element 310 of the lower header 500 and the lower header 500, The cooling water discharge hole 410 of the upper header 400 and the upper side of the upper header 400 to be discharged through the outlet pipe 220 formed on the upper side of the housing 200 .

First, the body 100 forms a space for allowing the induction coil 300 and the heating element 310 to be provided therein, and forms a space through which the cooling water can flow. For example, as shown in FIG. 1, Can be formed concavely inward.

The housing 200 is coupled to the body 100 and may be coupled to the body 100 such that a rim portion contacting the body 100 is hermetically sealed. At this time, the housing 200 may be formed in a container shape with its side facing the body 100 opened, and one side may be recessed inward. An inlet pipe 210 may be formed on the lower side of the housing 200, and an outlet pipe 220 may be formed on the upper side of the housing 200. In addition, the induction coil 300 and the heating element 310 may be provided inside the space formed therein as described above. A portion of the induction coil 300 and the heating element 310 may be disposed in the space of the body 100 and the remaining portions of the induction coil 300 and the heating element 310 may be disposed in the space of the housing 200 .

The upper header 400 and the lower header 500 are for fixing the bobbin 600 and the heating element 310 on which the induction coil 300 is wound and the upper header 400 and the lower header 500 are fixed to each other in the height direction And may be coupled to the body 100 or the housing 200 or both the body 100 and the housing 200 to be fixed. The upper header 400 is provided with a cooling water discharge hole 410 passing through the upper and lower surfaces so that the cooling water can pass therethrough and the lower header 500 is provided with a cooling water inflow hole 510 passing through the upper and lower surfaces, Can be formed. The upper header 400 is disposed at a position spaced downward from the upper end of the inner space formed by the coupling of the body 100 and the housing 200. The lower header 500 includes a body 100 and a housing 200 The upper end of the inner space formed by the engagement of the upper and lower ends of the inner space. The upper header 400 may be disposed on the lower side of the outlet pipe 220 in the height direction and the lower header 500 may be disposed on the upper side of the inlet pipe 210 in the height direction. In addition, the upper header 400 and the lower header 500 may be formed in a plate shape and arranged in a horizontal direction, and may be arranged in parallel with each other.

The bobbin 600 is for fixing the induction coil 300. The bobbin 600 is disposed such that both open ends of a cylindrical portion 610 formed in a cylindrical shape of an electrically insulating material are oriented in the height direction, (400) and the lower header (500). The bobbin 600 is supported by the upper header 400 and the lower header 500 so that the upper header 400 and the lower header 500 can be coupled to each other with the bobbin 600 interposed therebetween. So that the bobbin can be fixed so as not to move up and down.

The induction coil 300 may be wound on the outer side of the bobbin 600 and may be formed in a coil spring shape wound in a plurality of times. The induction coil 300 may be formed such that extension lines extending from the wound portion of the coil are drawn out to the outside through the body 100. The extended lines are connected to the control unit 700 formed on one side of the body 100 And can be electrically connected. A portion of the induction coil 300 through which the extension lines penetrate the body 100 may be sealed using a sealing member such as wire sealing.

The heating element 310 may be formed by a cylindrical metal or a magnetic material and may be heated by the induction coil 300. When the alternating current flows through the induction coil 300, . Similarly to the bobbin 600, both ends of the heating element 310 may be coupled to the upper header 400 and the lower header 500. Also, the heating element 310 may be formed in a cylindrical shape so that both open ends thereof face the height direction. In addition, the heating element 310 may be disposed on the inner side of the bobbin 600. At this time, the cooling water discharge hole 410 and the cooling water inlet hole 510 formed in the upper header 400 and the lower header 500 may be formed to communicate with the inside and the outside of the heating element 310.

The control unit 700 may be formed on the body 100. The control unit 700 may be formed on the opposite side of the body 100 to which the housing 200 is coupled. In this case, the control unit 700 may include a control unit case 710 formed by recessing a part of the body 100 so that the substrate 720 may be fixed inside the control unit case 710, The electronic devices 730 may be coupled. The control unit cover 740 may be coupled to cover the open side of the control unit case 710 so as to close. An extension line of the induction coil 300 may be connected to the controller 700 and controlled.

The cooling water flowing through the inlet pipe 210 formed on the lower side of the housing 200 flows through the cooling water inflow hole 510 formed in the lower header 500 through the inlet side tank portion A1 which is the lower space of the lower header 500 And flows upward through the space between the outer side of the heating element 310 and the bobbin 600 so that heat exchange occurs between the heating element 310 and the cooling water and the cooling water discharging holes 410 formed in the upper header 400 Through an outlet pipe 220 formed on the upper side of the housing 200 through the outlet side tank portion A2 which is an upper space of the upper header 400. [

Accordingly, the cooling water heater of the present invention flows in the upward direction while the cooling water flows in from the lower side and comes into contact with the heating element, and then the cooling water is discharged from the upper side. Therefore, the bubbles, which are generated by heating by the heating element, The cooling water can be discharged together with the cooling water, so that the bubble discharging property of the cooling water can be improved, so that the heat exchange between the cooling water and the heating element becomes smooth, thereby preventing the heating element from overheating.

A guide groove 110 is formed in the body 100 to be concave in the horizontal direction on the concave inner side so that the upper header 400 and the lower header 500 are inserted and coupled along the guide groove 110 .

That is, the upper header 400 can be inserted into the inner space formed in the body 100 along the guide groove 110 formed in the body 100, and the length of the upper header 400 in the guide groove 110 Direction can be inserted into the guide groove 110 and the movement of the upper header 400 in the height direction can be fixed. The guide groove 110 may be recessed on both longitudinal surfaces of the body 100 to form a concave inner surface, and may be formed on the widthwise surface of the inner surface. Also, the guide groove 110 may be recessed in the inner surface, but a pair of guide portions protruding up and down may be formed to form a guide groove between the guide portions. Further, the guide groove to which the upper header 400 is coupled may be formed at a position spaced downward from the upper surface of the concave inner surface of the body. The lower header 500 can be inserted into the inner space formed in the body 100 along the guide groove 110 formed in the body 100 and inserted into the guide groove 110 in the longitudinal direction of the lower header 400 Both sides of the lower header 500 can be inserted into the guide groove 110 and the movement of the lower header 500 in the height direction can be fixed. Also, the guide grooves into which the lower header 500 is inserted may be formed at a position spaced upward from the lower one of the concave inner surfaces of the body.

Thus, the upper header 400 and the lower header 500 can be easily coupled to the body 100 and fixed. At this time, an assembly is formed by assembling the upper header 400 and the lower header 500 to be coupled through the bobbin 600 wound with the induction coil 300 and the heating body 310, The assembly 400 can be coupled to the body 100 by inserting and coupling the lower header 500 and the lower header 500 along the guide groove 110 of the body 100.

The upper and lower headers 400 and 500 may be inserted into the fixing groove 230 so that the upper header 400 and the lower header 500 may be coupled to each other. have.

In other words, the fixing groove 230 may be formed concavely in the inner surface of the housing 200. Likewise, the fixing groove 230 may be formed at a position spaced downward from the upper surface of the inner surface, Another one may be formed at the spaced apart position. Thus, the upper header 400 and the lower header 500 can be inserted into the fixing groove 230 and coupled. At this time, when the housing 200 is coupled to the body 100 in a state where one of the upper header 400 and the lower header 500 is inserted into the guide groove 110 of the body 100 and the assembly is assembled The upper header 400 and the lower header 500 may be fitted into the fixing groove 230 of the housing 200 so that the upper header 400 and the lower header 500 may be coupled to each other in the horizontal direction. It can be firmly fixed so as not to move and move in the vertical direction.

The cooling water inflow hole 410 formed in the upper header 400 and the cooling water inflow hole 510 formed in the lower header 500 are formed on the inner side of the bobbin 600 when viewed from the upper side or the lower side, The outer circumferential surface of the heating body 310 may be formed radially inward of the outer circumferential surface of the heating body 310 with reference to a position spaced apart from the bobbin 600.

The cooling water flowing through the heating element 310 passes through the cooling water inflow hole 510 of the lower header 500 and simultaneously passes through the inside and outside of the heating element 310. The cooling water passing through the outside of the heating element 310 passes through the bobbin 600, And is discharged through a cooling water discharge hole 510 formed in the upper header 400. [0064] As the distance between the bobbin 600 and the heating element 310 is increased, the bobbin 600 and the induction coil 300 wound on the bobbin are less heated to secure the safety of the induction coil 300, And the bobbin 600 are sufficiently spaced from each other. At this time, if the distance between the heating element 310 and the bobbin 600 is increased, the flow rate of the cooling water passing therethrough is slowed, and the temperature of the heating element 310 may be increased to overheat. Therefore, it is possible to prevent the bobbin 600, the induction coil 300, and the heating element 310 from being overheated by increasing the flow rate of the cooling water passing through the heating element 310 and the bobbin 600 at a sufficient distance. The cooling water inflow hole 410 and the cooling water discharge hole 510 are formed from the position spaced apart from the bobbin 600 as described above so that the heating element 310 is radially inwardly positioned on the basis of the cooling water inflow hole 410 and the cooling water discharge hole 510, Or may be formed in a range larger than that. 7 and 8, the cooling water introduced through the cooling water inflow hole 410 quickly passes through the cooling water flow region B1 and is discharged through the cooling water discharge hole 510. In particular, the cooling water outside the heating element 310 It is possible to quickly pass through the flow region B1. At this time, the cooling water stagnant region B2 formed adjacent to the cooling water flow region B1 outside the heating element 310 is blocked at the upper side and the lower side, so that the cooling water is rotated in the cooling water stagnant region B2, So that a formed or stagnated region is formed. The bobbin 600 and the induction coil 300 and the induction coil 300 can be separated from each other while the distance between the bobbin 600 and the heat generating element 310 is increased and the flow rate of the cooling water that is heat- It is possible to prevent both of the heating elements 310 from being overheated.

The cooling water inflow hole 410 formed in the upper header 400 and the cooling water inflow hole 510 formed in the lower header 500 are formed in the inner region and the outer region of the heating element 310 when viewed from the upper side or the lower side, .

That is, the cooling water inflow hole 410 and the discharge hole 510 formed in the header 400 or 500 as seen from the upper side or the lower side as shown in FIG. May be formed on the inside and the outside of the heating element 310.

The upper header 400 and the lower header 500 may include a flow regulator 530 that blocks a portion of the inner region of the heating element 310 when viewed from the upper side or the lower side.

That is, the flow regulating portion 530 may be formed to cover a part of the inner region of the heating element 310 so that the flow rate of the cooling water passing through the inside and the outside of the heating element 310 can be adjusted. At this time, the flow regulating unit 530 may be formed in a circular plate shape at the inner central portion of the heating element 310, and may be formed in various sizes.

The bobbin 600 may have coil supporting portions 620 formed at the upper and lower ends of the bobbin 600 in a radially outward direction from the outer circumferential surface of the cylindrical portion 610.

That is, as shown in the drawing, the bobbin 600 is formed with a cylindrical cylindrical portion 610 penetrating up and down. The bobbin 600 has plate-like coil supporting portions 620 protruding radially outward from the outer circumferential surface at both upper and lower ends of the cylindrical portion 610 May be formed. The coil supports 620 may be spaced apart in the circumferential direction to form a plurality of coils. Thus, the induction coil 300 can be disposed between the coil supporters 620 formed at the upper and lower ends, so that the induction coil 300 can be prevented from being detached or moved.

The bobbin 600 has a protruding portion 630 protruding from the coil supporting portion 620 in the height direction so that the protruding portion 630 is inserted into the bobbin coupling holes 440 and 540 formed in the headers 400 and 500 Can be inserted and combined.

This allows the protrusion 630 formed on the bobbin 600 to be inserted into and bonded to the bobbin coupling holes 440 and 540 formed in the headers 400 and 500 so that the bobbin 600 can be firmly fixed to the header, So that the induction coil 300 is prevented from being rotated with respect to the center axis in the up and down direction. At this time, the protrusion 630 may be formed at the upper and lower ends of the bobbin 600 and protrude from the coil supporter 620. The auxiliary discharge hole 420 and the auxiliary discharge hole 520 may be formed in the headers 400 and 500 to cool the induction coil 300. The auxiliary discharge hole 420 and the auxiliary discharge hole 520 may be formed in the headers 400 and 500, The protruding portion 630 is formed in a shape corresponding to the auxiliary discharge hole 420 and the auxiliary discharge hole 520 so that the auxiliary discharge hole 420 and the auxiliary discharge hole 520 are connected to the bobbin coupling holes 440 and 540 You can do it instead.

The upper header 400 and the lower header 500 may be formed with bobbin guide grooves 450 and 550 in which the coil support portions 620 of the bobbin 600 are inserted.

That is, the bobbin guide grooves 450 and 550 are recessed in the headers 400 and 500 to fix the position of the bobbin 600 in the horizontal direction so that the coil support portions 620 may be inserted and positioned.

The upper header 400 and the lower header 500 may be formed with heating element coupling grooves 460 and 560 through which the ends of the heating element 310 are inserted and coupled to each other.

In order to fix the position of the heating element 310 in the horizontal direction, the heating element coupling grooves 460 and 560 are recessed in the headers 400 and 500 so that the heating element 310 is inserted into the heating element coupling grooves 460 and 560 Can be inserted and combined.

The support body 120 may be formed to protrude from the widthwise surface of the concave inner surface of the body 100 to support the induction coil 300. The housing 200 may be formed long in the height direction, And the inlet pipe and the outlet pipe may be formed. Or the inlet pipe and the outlet pipe may be formed in the body.

In addition, the heating element 310 may be formed of a ferrite material having a very high magnetic permeability so that heat can be generated by an induction method. For example, the ferrite material may be STS430 of stainless steel. The heating element 310 may be formed of a material having higher electric resistance than that of the induction coil 300. In order to facilitate the discharge of the bubbles from the cooling water, the direction in which the cooling water to be heat-exchanged with the heating element 310 flows may be formed to be vertically upward, and inclined in an angle range smaller than 90 degrees with respect to the vertical upper direction . That is, the heating element 310 and the bobbin 600 are arranged side by side so that the angle between the heating element 310 and the bobbin 600 is less than 90 degrees with respect to the vertical direction, . The heating element 310 and the bobbin 600 are arranged concentrically so that the cooling water passing between the heating element 310 and the bobbin can be uniformly distributed.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

1000: Cooling water heater
100: Body
110: guide groove 120: support
200: Housing
210: inlet pipe 220: outlet pipe
230: Fixing groove
300: Induction coil 310: Heating element
400: upper header
410: cooling water discharge hole 420: auxiliary discharge hole
430: flow regulator 440: bobbin coupling ball
450: bobbin mounting groove 460: heating element bonding groove
500: Lower header
510: cooling water inflow hole 520: auxiliary inflow hole
530: Flow regulator 540: Bobbin coupling ball
550: bobbin mounting groove 560: heating element bonding groove
600: Bobbin
610: Cylinder part 620: Coil support part
630:
700:
710: Control unit case 720:
730: electronic element 740: control cover
A1: inlet-side tank portion A2: outlet-side tank portion
B1: cooling water flow area B2: cooling water stagnation area
B3: Coil cooling area

Claims (10)

A body 100;
A housing 200 coupled to a side surface of the body 100;
The body 100 and the housing 200 are provided in an inner space formed by the coupling of the body 100 and the housing 200. The body 100 and the housing 200 are spaced apart from the upper and lower ends of the inner space, An upper header 400 and a lower header 500 coupled to any one or more of the plurality of lower header 400;
A bobbin 600 formed in a cylindrical shape and coupled so that both open ends thereof are supported by the upper header 400 and the lower header 500;
An induction coil 300 wound around the bobbin 600; And
A heating element 310 coupled to the upper header 400 and the lower header 500 so as to be open at both ends thereof and spaced apart from the inside of the bobbin 600; , ≪ / RTI >
The cooling water flowing into the inlet pipe 210 formed on the lower side of the housing 200 is transferred between the lower side of the lower header 500 and the cooling water inflow hole 510 of the lower header 500 and between the heating element 310 and the bobbin 600 The cooling water discharge hole 410 of the upper header 400 and the upper header 400 to be discharged through the outlet pipe 220 formed on the upper side of the housing 200. [ heater.
The method according to claim 1,
A guide groove 110 is formed in a concave inner side surface of the body 100 in a horizontal direction so that the upper header 400 and the lower header 500 are inserted and coupled along the guide groove 110 Cooling water heater.
The method according to claim 1,
The housing 200 is formed with a fixing groove 230 concaved in a horizontal direction on a concave inner surface thereof and the upper header 400 and the lower header 500 are inserted into the fixing groove 230 to be coupled thereto Cooling water heater.
The method according to claim 1,
The cooling water inflow hole 410 formed in the upper header 400 and the cooling water inflow hole 510 formed in the lower header 500 are formed inside the bobbin 600 when viewed from the upper side or the lower side, 600, or the outer circumferential surface of the heating element (310) in the radial direction with respect to a position spaced apart from the outer circumferential surface of the heating element (310).
The method according to claim 1,
The cooling water inflow hole 410 formed in the upper header 400 and the cooling water inflow hole 510 formed in the lower header 500 are formed over the inner region and the outer region of the heating element 310 when viewed from above or below And a cooling water heater.
The method according to claim 1,
Wherein the upper header (400) and the lower header (500) are formed with flow regulating portions (530) which cover a part of the inner region of the heating element (310) when viewed from above or below.
The method according to claim 1,
Wherein the bobbin (600) has a coil supporting portion (620) formed on the upper and lower ends of the cylindrical portion (610) radially outward from the outer circumferential surface thereof.
8. The method of claim 7,
The bobbin 600 has a protruding portion 630 protruding from the coil supporting portion 620 in the height direction so that the protruding portion 630 is inserted into the bobbin coupling holes 440 and 540 formed in the headers 400 and 500 Wherein the cooling water heater is combined with the cooling water heater.
8. The method of claim 7,
Wherein the upper header 400 and the lower header 500 are formed with bobbin guide grooves 450 and 550 in which the coil support portions 620 of the bobbin 600 are inserted and positioned. .
The method according to claim 1,
Wherein the upper header (400) and the lower header (500) are formed with heating element coupling grooves (460, 560) through which the ends of the heating element (310) are inserted and coupled to each other.

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