KR102092137B1 - Cooling-water heating type heater - Google Patents

Abstract

The present invention relates to a coolant-heated heater, and more specifically, in a coolant-heated heater in which heat is exchanged by cooling water flowing into an inside of a heating pipe in which a cylindrical heating element is formed, in the case of overheating of the heating element by designing a concentrated heat density unit in the heating element A cooling water heater that prevents fire due to overheating of the heating element by blocking the power supplied to the heating element by causing the electrode connected to the concentrated heat density portion to overheat and short-circuit the temperature of the centralized heat density portion before the rest. will be.

Description

Cooling-water heating type heater}

The present invention relates to a cooling water heating heater, in a cooling water heating heater in which cooling water flows and heat exchanges inside a heating pipe in which a cylindrical heating element is formed, in the heating water heating heater, a centralized heat density part is designed in the heating element to overheat the heating element. It relates to a coolant-heated heater that can cut off the power supplied to the heating element by causing the electrode connected to the concentrated heat density unit to overheat and short-circuit as the temperature rises before the rest.

Vehicles that use engines that use gasoline, diesel, etc. as the energy source are the most common types of vehicles at present, but these energy sources for vehicles are not only environmentally responsible, but also need for new energy sources due to various causes such as reduction in oil reserves. As it is becoming increasingly popular, electric vehicles, hybrid cars, and fuel cell vehicles are being put into practical use or development.

However, in electric vehicles, hybrid cars, and fuel cell vehicles, unlike conventional vehicles using engines that use oil as an energy source, it is difficult or impossible to apply a heating system using cooling water. That is, in the case of a vehicle using a conventional oil-based engine as a driving source, a lot of heat is generated in the engine, a cooling water circulation system for cooling the engine is provided, and the heat absorbed by the cooling water is heated indoors. To use it. However, since a lot of heat generated by the engine does not occur in the driving source of the electric vehicle, the hybrid car, and the fuel cell vehicle, there is a limitation in using such a conventional heating method.

Accordingly, in electric vehicles, hybrid cars, and fuel cell vehicles, various studies have been conducted such as adding a heat pump to an air conditioning system so that it can be used as a heat source, or by providing a separate heat source such as an electric heater. have. Among them, electric heaters can be used to heat the cooling water more easily without significantly affecting the air conditioning system, and are currently widely used.

Here, the electric heater includes an air-heated heater in the form of directly heating air blown into the vehicle interior, and a coolant-heated heater (or coolant heater) in the form of heating the coolant.

The "cooling medium heating device and a vehicle air conditioner using the same", which is a dual cooling water heating type heater (Japanese Patent Publication No. 2008-056044), includes a positive temperature coefficient (PTC) electrode plate 41 as a heat source as shown in FIG. The heat medium distribution boxes 30 and 50 are brought into close contact with the upper and lower parts, and the upper side of the upper heat medium distribution box 30 and the lower side of the lower heat medium distribution box 50 are sealed by the substrate receiving box 20 and the lid 51, respectively. Disclosed is a cooling water heater having a structure to cool the cooling water more effectively by increasing the heat transfer efficiency between the PTC electrode plate and the cooling water by allowing the cooling water to flow through the flow paths 33 and 54, which are spaces formed between the fins of the plate. have.

However, the cooling water heater as described above lacks a safety device that can cut off the power supplied to the heating element when the heating element is overheated, and there is a risk that the heating element may overheat and cause a fire. In addition, there is a disadvantage that the temperature deviation of the heating element is large and the heat transfer efficiency is lowered according to the flow direction of the cooling water.

JP 2008-056044 A (2008.03.13)

The present invention has been devised to solve the problems as described above, and the object of the present invention is to provide a heat exchanger in a cooling water heating heater in which heat is exchanged by cooling water flowing into a heat generating pipe having a cylindrical heating element. When the heating element is overheated, the temperature of the concentrated heat density portion rises before the rest, so that the electrode connected to the concentrated heat density portion is overheated and shorted, so that power supplied to the heating element is cut off to prevent fire due to overheating of the heating element. It is to provide a cooling water heating heater that can.

Cooling water heating heater 1000 of the present invention for achieving the above object is formed, a cylindrical heating element 120 is formed, both ends of the pipe 110 is opened, the heating pipe (100) that the cooling water is distributed to the inside ; Including, the heating element 120, the concentrated heat density unit (121-1) having a heat density higher than the heat density (heat generation / unit area) of the rest of the portion; And an electrode terminal 123 formed on the electrode 122 to which the concentrated heat density unit 121-1 is connected, and connected to an electric wire. Including, when the heating element 120 is overheated, the temperature of the concentrated heat density unit 121-1 rises before the rest, and the electrode 122 connected to the concentrated heat density unit 121-1 is overheated. It is characterized in that the power supplied to the heating element 120 is cut off by being short-circuited.

In addition, the concentrated heat density portion 121-1 of the heating element 120 is characterized in that it is formed on the cooling water inlet side of the heating pipe 100.

In addition, the heating element 120 is characterized in that the heat density is gradually lowered from the cooling water inlet side to the outlet side of the heating pipe 100.

In addition, the heating element 120 is a concentrated heat density unit (121-1), a high-capacity heating unit (121-2) and a low-capacity heating unit in the order of high heat density from the cooling water inlet side to the outlet side of the heating pipe (100) Characterized in that (121-3) is formed.

In addition, it is characterized in that the temperature sensor 200 is installed in the concentrated heat density unit (121-1) of the heating element 120.

In addition, the heating element 120 is formed in a cylindrical shape to surround the outer circumferential surface of the pipe 110, the heating element 120 is a plurality of heating element pattern 121 is formed along the circumferential direction of the pipe 110, the heating element pattern (121) are arranged spaced apart from each other in the longitudinal direction of the pipe 110, the heating element pattern 121 is characterized in that connected in parallel to the electrode (122).

Further, it is characterized in that the temperature sensor 200 is formed on the pipe 110 over the entire range in which the heating element patterns 121 are spaced apart along the longitudinal direction of the pipe 110.

In addition, the heating element 120 and the temperature sensor 200 is printed and sintered on the pipe 110 is characterized in that formed integrally.

In the cooling water heating heater of the present invention, when the heating element is overheated, the temperature of the centralized heat density portion rises before the rest, so that the electrode connected to the concentrated heat density portion is overheated and shorted, so that power supplied to the heating element is cut off, resulting in overheating of the heating element It has the advantage of preventing fire.

In addition, the overheating of the heating element is prevented, and the temperature of the heating element is uniform, thereby improving the heat transfer efficiency.

1 is a cross-sectional view showing a conventional cooling water heater.
Figure 2 is a perspective view showing the cooling water heater of the present invention.
Figure 3 is a front sectional view showing the cooling water heater of the present invention.
4 is a front view showing a heating pipe according to the present invention (a state in which a heating element is formed in a pipe).
5 and 6 are graphs and thermal analysis pictures showing the heat density of the heating element according to the present invention.
7 is a developed view showing a circuit pattern of a heating element pattern, an electrode, an electrode terminal, and a temperature sensor of a heating element according to the present invention.

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

2 and 3 are a perspective view and a front sectional view showing a cooling water heating heater of the present invention, and FIG. 4 is a front view showing a heating pipe (a state in which a heating element is formed in a pipe) according to the present invention, and FIGS. 5 and 6 are the present invention Graph and thermal analysis showing the heat density of the heating element according to the.

Cooling water heating heater 1000 of the present invention as shown, the heating element 120 of the cylindrical is formed, both ends of the pipe 110 is opened, the heating pipe 100 is distributed cooling water to the inside; Including, the heating element 120, the concentrated heat density unit (121-1) having a heat density higher than the heat density (heat generation / unit area) of the rest of the portion; And an electrode terminal 123 formed on the electrode 122 to which the concentrated heat density unit 121-1 is connected, and connected to an electric wire. Including, when the heating element 120 is overheated, the temperature of the concentrated heat density unit 121-1 rises before the rest, and the electrode 122 connected to the concentrated heat density unit 121-1 is overheated. By being short-circuited, the power supplied to the heating element 120 may be cut off.

First, the heating pipe 100 may be formed in a form in which a cylindrical heating element 120 is formed on the outer circumferential surface of the pipe 110, the inside of which is hollow and the both ends are opened so that cooling water can flow therein, and the cylindrical heating element 120 is formed in the form of a thin film is attached to the outer peripheral surface of the pipe 110 or by heating the heating element 120 on the outer peripheral surface of the pipe 110 by sintering the cylindrical heating element 120 on the outer peripheral surface of the pipe 110 Can be formed.

In addition, the heating element 120 is formed with a concentrated heat density unit 121-1 so that the heat density (heat generation amount / unit area) on one side is higher than the heat density of the remaining parts. That is, in the heating element 120, the centralized heat density part 121-1 having a relatively high heat density among all the heating elements 120 is formed on one side in the longitudinal direction of the pipe 110, and the remaining parts have a relatively high heat density. It can be formed low. In other words, one side of the heating element 120, which is a part of the left side in the longitudinal direction of the pipe 110 among the entire heating elements 120, has a high thermal density, and the central portion of the heating element 120 and the other portion of the other side are the concentrated heat density portion. Thermal density may be lower than that of (121-1).

At this time, the heating element 120 is formed with an electrode terminal 123 so that the electric wire is connected to the electrode 122 to which the concentrated heat density unit 121-1 is connected, so that the electric wire for power supply is soldered or the like to the electrode terminal 123. Can be connected to.

Thus, in the cooling water heating heater of the present invention, when the heating element 120 is overheated, the temperature of the concentrated heat density unit 121-1 rises before the rest, as shown in the thermal analysis picture of FIG. 6, and the concentrated heat density unit 121- The electrode 122 connected to 1) may be configured such that the power supplied to the heating element 120 is cut off by overheating and shorting. Accordingly, even if a failure occurs in a separate safety device that shuts off the power when the heating element 120 is overheated, the electrode of the concentrated heat density unit may be shorted to cut off the power, thereby preventing fire of surrounding components.

At this time, since the electrode terminal 123 is disposed close to the concentrated thermal density unit 121-1, the electrode terminal 123 is connected to the electrode 122 connected to the concentrated thermal density unit 121-1, so that the concentrated thermal density When the portion 121-1 is overheated, the electrode terminal 123 and a wire connection portion (solder, etc.) for connecting the electric wires are also overheated and shorted, so that power supplied to the heating element 120 may be cut off.

In addition, the concentrated heat density unit 121-1 of the heating element 120 may be formed on the cooling water inlet side of the heating pipe 100.

This is the temperature at which cooling water is introduced into one side of the heating pipe 100 and cooling water is discharged to the other side, and a concentrated heat density unit 121-1 of the heating element 120 is disposed at the cooling water inlet side of the heating pipe 100. The temperature difference of the heating element 120 can be reduced by first performing heat exchange between the cooling water having a low temperature and the concentrated heat density unit 121-1 having a relatively high temperature in the heating element 120. Accordingly, overheating of the heating element is prevented, and the temperature of the heating element becomes uniform, thereby improving heat transfer efficiency.

In addition, the heating element 120 may be formed to gradually lower the heat density from the cooling water inlet side to the outlet side of the heating pipe 100.

That is, since the cooling water passing through the inside of the heating pipe 100 is heated as the heat exchange progresses from the inlet side to the outlet side, the temperature rises. As shown in the graph of FIG. 5, the concentrated heat density is concentrated in the heating element 120 located at the inlet side of the cooling water. The heating element 120 may be formed with a lower heat density as the portion 121-1 is disposed and the cooling water flows, so that the entire heating element 120 has a uniform temperature distribution.

In addition, the heating element 120 is a concentrated heat density unit (121-1), a high-capacity heating unit (121-2) and a low-capacity heating unit in the order of high heat density from the cooling water inlet side to the outlet side of the heating pipe (100) (121-3) may be formed.

That is, as described above, the heat density may be gradually lowered from the cooling water inlet side to the outlet side of the heating pipe 120, but as shown in FIG. 4, the heating element 120 sequentially increases toward the cooling water flow direction. The heat density of the heating element 120 is formed by dividing the region into a concentrated heat density unit 121-1, a high-capacity heating unit 121-2, and a low-capacity heating unit 121-3. You can have.

In addition, the temperature sensor 200 may be installed in the concentrated heat density unit 121-1 of the heating element 120.

That is, since the concentrated heat density unit 121-1 maintains a slightly higher heating surface temperature than the rest of the portion during normal heating, the temperature measured by installing the temperature sensor 200 on the concentrated heat density unit 121-1 Accordingly, the operation of the heating element 120 can be controlled. At this time, when the temperature of the centralized heat density unit 121-1 exceeds the set value, power supplied to the heating element 120 through the control circuit may be cut off.

In addition, the heating element 120 is formed in a cylindrical shape to surround the outer circumferential surface of the pipe 110, the heating element 120 is a plurality of heating element pattern 121 is formed along the circumferential direction of the pipe 110, the heating element pattern The 121s are spaced apart from each other in the longitudinal direction of the pipe 110, and the heating element patterns 121 may be connected to the electrode 122 in parallel.

That is, as shown in FIG. 7, the heating element 120 may be configured such that a plurality of heating element patterns 121 spaced apart from each other in the longitudinal direction of the pipe 110 are connected in parallel by the electrode 122, and the electrode 122 ) Is formed in a pair such that both ends of the heating element patterns 121 are connected to each other, so that an electrode terminal 123 may be formed at one end of the electrodes 122. At this time, some of the heating element patterns 121 on the left side may be formed of a concentrated heat density unit 121-1, and some heating element patterns 121 on the right side of the high-capacity heating unit 121-2 and the other heating element patterns 121 They may be formed of a low-capacity heating unit (121-3). In addition, the heating element patterns 121 may have different thermal densities by different thicknesses, widths, spaced distances, materials, and the like. In addition, the heating element pattern 121, the electrode 122 and the electrode terminals 123 are sintered after screen printing on the pipe 110 to form a thin film type heating element 120 in a cylindrical shape in close contact with the outer circumferential surface of the pipe 110. Can be.

In addition, the temperature sensor 200 may be formed on the pipe 110 over the entire range in which the heating element patterns 121 are spaced apart along the longitudinal direction of the pipe 110. That is, since the heat densities of the heating element patterns 121 are formed differently, the average temperature of the entire heating element 120 can be measured by forming the temperature sensor 200 in the longitudinal direction of the pipe 110.

At this time, the heating element 120 and the temperature sensor 200 may be formed integrally by being printed and sintered on the pipe 110. That is, the temperature sensor pattern 210 and the temperature sensor terminal 220 together when screen printing and sintering the heating element pattern 121, the electrode 122 and the electrode terminals 123 of the heating element 120 on the pipe 110 By screen printing and sintering, the heating element 120 and the temperature sensor 200 may be integrally formed on the outer peripheral surface of the pipe 110. In addition, the temperature sensor 200 may have a temperature sensor pattern 210 in a 'U' shape so that the temperature sensor terminals 220 are disposed and connected to the portion where the electrode terminals 123 of the heating element 120 are formed. . In addition, when the heating element 120 is formed in a cylindrical shape in the pipe 110, the temperature sensor 200 may be disposed to be spaced apart from the electrodes 122 between the electrodes 122 of the heating element 120.

In addition, a control circuit unit 800 (substrate) that is disposed spaced apart from the outside of the heating pipe 100 and connected to the heating element 120 of the heating pipe 100 to control the heating element 120 may be further provided. . In addition, a heat shield plate 700 is provided between the heating pipe 100 and the control circuit unit 800 to prevent the control circuit unit 800 from being heated by radiant heat generated from the heating element 120. In addition, transistors 810 and IGBT are coupled to the cooling water inlet side of the heating pipe 100 so that the transistor generating a lot of heat can be cooled by the coolant flowing at a low temperature.

In addition, the inlet block 410 and the inlet pipe 400 may be connected and coupled to one side of the heating pipe 100, and the outlet block 510 and the outlet pipe 500 may be connected to and coupled to the other side. In addition, the transistor 810 may be coupled to the outside of the inlet block 410. In addition, the upper cover 610 on the upper side and the lower cover 62 on the lower side may be combined to be spaced apart from the outside of the heating pipe 100, and the upper cover 610 and the lower cover 620 are inlets. It may be coupled to the pipe 400 and the outlet pipe 500, the upper cover 610 and the lower cover 620 of the rim portion may be combined with each other. In addition, the thermal barrier plate 700 and the control circuit unit 800 may be fixed to the upper cover 610.

The present invention is not limited to the above-described embodiments, and of course, the scope of application is diverse, and anyone who has ordinary knowledge in the field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible.

1000: Cooling water heater
100: heating pipe
110: pipe 120: heating element (film heater)
121: heating element pattern 121-1: concentrated heat density part
121-2: High capacity heat density part 121-3: Low capacity heat density part
122: electrode 123: electrode terminal
200: temperature sensor
210: temperature sensor pattern 220: temperature sensor terminal
400: inlet pipe 410: inlet block
500: outlet pipe 510: outlet block
610: upper cover 620: lower cover
700: thermal barrier plate
800: control circuit (substrate) 810: transistor (IGBT)

Claims (8)

A cylindrical heating element 120 is formed, both ends of the pipe 110 is opened, the heating pipe 100 through which coolant flows; It includes,
The heating element 120,
A plurality of heating element patterns 121 formed along the circumferential direction of the pipe 110 and spaced apart from each other in the longitudinal direction of the pipe 110;
A pair of electrodes 122 connected to the plurality of heating element patterns 121; And
An electrode terminal 123 connected to the pair of electrodes 122; Including,
The heating element 120 is formed of a concentrated heat density unit 121-1 having a heat density higher than the heat density (heat generation amount / unit area) of the rest of the heating element patterns 121,
An electrode terminal 123 is disposed on one side of the concentrated heat density portion 121-1 in the longitudinal direction of the pipe 110, and a heating element formed on the other side has a lower thermal density than the concentrated heat density portion 121-1. The patterns 121 are arranged,
When the heating element 120 is overheated, the temperature of the concentrated heat density portion 121-1 rises before the rest of the portion, and the electrode 122 connected to the concentrated heat density portion 121-1 is overheated and shorted. Cooling water heating heater, characterized in that the power supplied to 120 is cut off.
According to claim 1,
The concentrated heat density unit 121-1 of the heating element 120 is formed on the cooling water inlet side of the heating pipe 100.
According to claim 2,
The heating element 120 is a cooling water heating heater, characterized in that the heat density gradually decreases from the cooling water inlet side to the outlet side of the heating pipe 100.
According to claim 2,
The heating elements 120 are concentrated heat density parts 121-1, high-capacity heat-generating parts 121-2, and low-capacity heat generating parts 121 in order of high heat density from the cooling water inlet side to the outlet side of the heating pipe 100. Cooling water heating heater, characterized in that -3) is formed.
According to claim 1,
Cooling water heating heater, characterized in that the temperature sensor 200 is installed in the concentrated heat density unit (121-1) of the heating element (120).
delete According to claim 1,
The heating element pattern 121, the cooling water heating heater, characterized in that the temperature sensor 200 is formed on the pipe 110 over the entire range arranged spaced apart along the longitudinal direction of the pipe (110).
The method of claim 7,
The heating element 120 and the temperature sensor 200 is printed and sintered on the pipe 110, the cooling water heating heater, characterized in that formed integrally.

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