KR20150051424A - Portable immersion heaters with against overheating function - Google Patents

Abstract

The present invention provides a portable underwater heater having a ground function and an improved function to cut off power in the case of overheating or a low water level. Disclosed is a portable underwater heater, comprising: a main body case wherein a pair of heating tube coupling unit and a temperature sensing unit is formed in a hollow form and protruds from one side of the lower surface; a heating tube embedding a heating element wherein both ends are inserted into and coupled inside of the heating tube coupling unit and which is connected electrically to an external power source via a plug and a conductor and generates heat when power is applied; a control unit embedded in the main body case and regulating a temperature of the heating element and controlling a power source; a temperature sensing tube wherein the upper part is inserted into the temperature sensing tube coupling unit and which embeds a temperature sensor connected electrically to the control unit so as to control the operation of the heating element; a micro switch embedded in the main body case so as to open and close a power source of the heating element; a float provided in the lower part of the main body case and capable of ascending depending on the water level of an object to be heated and capable of opening and closing the micro switch; a ground line which connects electrically the heating tube and the temperature sensing tube to a ground terminal of the plug, and is connected through a screw hole, which is provided to connect the upper parts of the heating tube and the temperature sensing tube in the heating tube coupling unit and the temperature sensing tube coupling unit to the heating tube coupling unit and the temperature sensing tube coupling unit, respectively, inside the main body case, and through a thermally conductive screw which is coupled to the screw hole.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a portable type immersion heaters with overheating prevention function,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable type water heater used to heat various heating objects such as water or liquid contained in a water bottle, And a mobile type submerged heater having a function of preventing leakage and overheating which can improve productivity.

The movable type water heater is used to easily heat a heating object such as a large amount of water or liquid chemicals or an aqueous solution contained in a bucket such as a basin or a container or a water tank to a predetermined temperature and has a high thermal efficiency and does not cause pollution Is widely used for industrial and household purposes.

FIG. 1 shows an example of such a movable type submerged heater. As shown in FIG. 1, a lower portion of a heating tube 12 having a heating element 14 that emits heat energy according to power supply is spirally wound, The control box 10 is coupled to the power source terminal 15 through an insertion portion 16 formed on the lower surface of the control box 10 and a temperature control unit 11 for controlling the temperature of the object to be heated And a lamp 17 for indicating whether the heating element 14 is operated or not is provided between the both ends of the heating tube 12 and a heater 17 for detecting the temperature of the heating object 12 and controlling the operation of the heating element 14 And the warm-feeling paper tube 13 is balanced with the heating tube 12 so as not to come into contact with each other.

One end of the heating tube 12 is grounded to the plug of the power supply terminal 15 in order to reduce the risk of electrical safety accidents such as electric shock during a short circuit.

However, in such a conventional underwater heater, since the water tube is partially damaged and the heating object is externally blown or the heating object is naturally evaporated, the heating body 14 is continuously heated, so that the water bottle and surrounding objects are ignited to cause a fire There is a problem.

On the other hand, Korean Utility Model Registration No. 20-0441512 and Korean Patent Registration No. 10-0967690 disclose that when the water level of the object to be heated contained in the water tank is low, the power is cut off by detecting the water level, Is disclosed.

That is, the above-mentioned underwater heater is provided so as to prevent heating or fire through an operation of opening and closing the power switch while the float is lifted and lowered according to the height of the water surface of the object to be heated in the water bottle.

However, it takes a considerable amount of time to control the operation of the heating element by controlling the operation of the heating element indirectly by using the sensing function of the water temperature sensing tube and the water level sensing function by floating the float as described above. There is a limit to prevent the fire due to the lack of direct control function in case of overheating.

As a result, a structure capable of directly detecting the heating temperature of the heating element and preventing a fire due to overheating of the heating element is disclosed in Korean Utility Model Registration No. 20-0313236. However, as shown in FIG. 2, A separate heat sensing part 8 for sensing the temperature must be directly connected to the heating body by welding or the like. Due to the structural characteristics, the production cost is high and there is a restriction in design, and the structure is considerably complicated. There is a problem that the productivity is significantly reduced.

On the other hand, a mobile type water heater having a fire preventing function by improving the function of cutting off the electric power at the time of overheating or at the low water level is developed by the present inventor, 10-1233284.

However, since the part of the wire connected to the heating pipe to be grounded by the plug is easily separated by an external force such as shock or shaking generated during use, it may lead to an electric shock due to a short circuit and the structure of the float switch is very complicated, The temperature of the object to be heated in the water bottle is measured by the water temperature sensor to indirectly control the operation of the heating body. Therefore, when the heating body is abnormally overheated without heating object in the water bottle, there is a limit in use.

In addition, when the heating element is overheated to the safety standard and allowable range, it is a safety device that cuts off the power to the heating element in response to it. It cuts off the current when it reaches the melting temperature and can not adjust to re- Therefore, if the bimetal is broken due to a normal operation or a malfunction, it can not be reused and the reliability and economical efficiency are deteriorated.

Korean Registered Patent No. 10-1233284 (Feb. Korean Utility Model Registration No. 20-0441512 (2008.08.21) Korean Patent Registration No. 10-0967690 (Jul. 7, 2010) Korea Registered Utility Model Bulletin No. 0119560 (March 16, 1996) Korean Utility Model Registration No. 20-0237611 (Oct. 11, 2001) Korean Patent Publication No. 2003-0035721 (2003.05.09) Korean Utility Model Publication No. 20-2008-0000909 (2008.05.08) Korean Registered Utility Model No. 20-0313236 (2003.05.17) Korean Utility Model Registration No. 20-0316512 (Jun. 2003) Korean Utility Model Registration No. 20-0368314 (November 11, 2004) Japanese Patent Application Laid-Open No. 2009-272230 (2009.11.19)

Accordingly, the present inventor has endeavored to develop a new portable type submersible heater which can simplify the structure and prevent the leakage and overheating by focusing on solving and improving the problems of the prior art, As a result of the research, the present invention has been completed.

Accordingly, an object of the present invention is to provide a mobile type submerged heater that can prevent electric shock accidents and fire caused by electric leakage and overheating more safely.

Another object of the present invention is to provide a mobile type submerged heater which is simple in structure and capable of reducing the production cost.

According to a preferred embodiment of the present invention, a pair of heating tube coupling parts and a temperature sensing tube coupling part are formed to protrude in a hollow shape at a predetermined interval from each other, A case body having protrusions formed on the other side of the main body case and protruding from the main body case so as to cause interference with a collar portion of the water bottle; and both ends are inserted into the heating tube coupling portion, A control unit built in the body case for controlling the temperature of the heating element and controlling the power supply; an upper end inserted into the temperature sensing tube coupling part, A temperature sensing tube electrically connected to the control unit and incorporating a temperature sensor for controlling the operation of the heating element; A micro switch that is built in the case and opens and closes the power supply of the heating element; a float mounted on a lower portion of the main body case to open and close the micro switch while lifting up and down into the main body case according to the level of the heating object; Wherein the heating tube and the temperature sensing tube are electrically connected to the heating tube and the temperature sensing tube, and the heating tube and the temperature sensing tube are located inside the heating tube coupling portion and the temperature sensing tube coupling portion, And a ground wire connected with a thermally conductive screw through a screw hole formed so as to communicate with the pipe coupling portion and the temperature sensing pipe coupling portion, respectively.

In the present invention, the leakage current through the heating tube is doubly grounded to the ground terminal of the plug through the heat transfer member and the temperature sensing tube, so that a more stable and satisfactory grounding state can be maintained to more effectively prevent electric shock accidents The safety can be greatly improved.

A preferred embodiment of the present invention further includes a conductive guide member which is fixed around the outside surface of the heating tube where the heating element is located and which guides and supports the lifting and lowering of the float, And a heat transfer member fixed around the outer surface of the temperature sensing tube where the temperature sensing tube is located.

Accordingly, since the temperature of the object to be heated in the water canal delivered through the temperature sensing tube and the heat output temperature of the heating tube transmitted through the heat transfer member are simultaneously detected by the single temperature sensor, It is possible to prevent the fire due to the overheating of the heating element, and it is also possible to improve the assemblability and the productivity because the production cost is low and the processing in various forms is easy.

According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, including the steps of: connecting a grounding line connected to a ground terminal of a plug to an end of a heating tube and a temperature sensing tube, Since the heating tube is double-grounded through the heating element and the temperature sensing tube, it is more robust and effective, and maintains a good grounding condition, so that the electric shock caused by the leakage current through the heating tube can be ensured .

In addition, since the temperature of the object to be heated in the water bottle conveyed through the temperature sensing tube and the heat generation temperature of the heating tube transmitted through the heat conductive member are simultaneously detected by the single temperature sensor, the overheat of the heating body can be prevented in advance, Can be prevented more safely, and unlike the conventional structure, the structure is simple and it is possible to use it repeatedly, so that it is possible to remarkably improve productivity and economical efficiency as well as cost reduction.

1 and 2 are block diagrams showing a movable type submerged heater according to a conventional technique.
FIG. 3 is a view illustrating a movable water heater according to an embodiment of the present invention.
4 is a side view showing a movable type submerged heater according to an embodiment of the present invention.
5 and 6 are local sectional views showing a movable type submerged heater according to an embodiment of the present invention.
FIG. 7 is a view illustrating a movable water heater according to another embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described more specifically with reference to the accompanying drawings.

Prior to this, the following terms are defined in consideration of the functions of the present invention, and they are to be construed to mean concepts that are consistent with the technical idea of the present invention and interpretations that are commonly or commonly understood in the technical field of the present invention.

In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

Herein, the attached drawings are exaggerated or simplified in order to facilitate understanding and clarification of the structure and operation of the technology, and it is to be noted that each component does not exactly coincide with the actual size.

3 to 6, the movable type submerged heater according to the embodiment of the present invention mainly includes a main body case 100, a heating tube 200, a control unit 300, a temperature sensing tube 400, (500), a float (600), and a ground line (700).

The main body case 100 includes a control unit 300 and a micro switch 500 that are electrically connected to each other through a plug W and a wire W for supplying external power. A pair of heating tube coupling parts 110 for hollow coupling the both ends of the tube 200 are formed in a hollow shape and the temperature sensing tube 400 is spaced apart from the heating tube coupling part 110 at a predetermined interval, A temperature sensing pipe coupling part 120 for inserting and coupling an upper end of the temperature sensing pipe is formed in a hollow shape.

A rod passing hole 150 for passing an upper end portion of a rod 610 of a float described later to the inside of the main body case 100 is formed between the heating pipe coupling portions 110, And a locking part 130 for stably maintaining the state of being fixed to the water bottle by causing contact interference with the part is formed.

Here, the upper surface of the main body case 100 may be provided with a power lamp (not shown) for indicating that power is applied to the heating element 210 and is operating, and the external power supplied through the plug P may be directly It is needless to say that a power switch (not shown) for opening and closing may be provided.

Further, the plug P is provided with a so-called grounding plug (a ground terminal and a connection terminal integral type) that maintains the potential at 0 to prevent an electric accident such as an electric shock.

The heating tube 200 is formed of a metal tube having a predetermined diameter and a length and is bent at an intermediate portion thereof like an acute angle so that both ends thereof are parallel to each other at regular intervals. The leakage current is guided to the ground through the plug P for connection with the external power source and is grounded through the ground terminal 700 and the ground terminal of the plug P so as to prevent a safety accident such as electric shock have.

Both ends of the heating tube 200 parallel to each other are inserted and fixed to a pair of heating tube coupling portions 110 formed on the lower surface of the main body case 100. The bending portion is electrically connected to an external power source, Shaped heating element 210 which generates heat by converting electrical energy into thermal energy by electrical resistance at the time of heating, and a thermally conductive filler 220 in the form of powder is densely filled in the space between the hollow portion and the heating element 210, 210).

Here, the heating tube 200 may be formed of a metal material such as titanium, tantalum, zirconium or stainless steel which is light in weight and excellent in corrosion resistance, chemical resistance and thermal conductivity, and the middle portion of the length is U- , A spiral, or the like.

The filling material 220 is made of magnesium oxide (MgO) having excellent thermal conductivity and insulating property so as to insulate the heating tube 200 from the heating element 210. The thermal efficiency of the heating element 210, And it is possible to maintain a stable state without deformation even with external physical impact.

A pair of conductors C electrically connected to the positive and negative currents of the external power source through the electric wires W are built in both ends of the heating tube 200 parallel to each other. Shaped heating elements 210 which are fixed to the main body case 100 and are electrically connected between the conductors C to generate heat when power is supplied thereto.

That is, the heating tube 200 includes a heating element 210 such as a nichrome wire having excellent thermal conductivity and durability and a conductor C that electrically connects the wire with the wire W, The same thermally conductive filler 220 may be densely packed and the portion having the heating element 210 embedded therein may be bent in various desired shapes.

It is needless to say that the heating element 210 may employ any one of various heating elements such as a nichrome wire, a carbon heating element, a ceramic heating element, and a tungsten wire.

The control unit 300 controls the heating temperature of the heating element 210 and controls the power source through the plug W and the plug P for power supply while being built in the main body case 100 And a temperature control knob 310 for controlling the operation of the control unit 300 and arbitrarily adjusting and setting the temperature of the heating body 210 is rotatable while being exposed on the upper surface of the main body case 100 Respectively.

That is, when the temperature is set to a reference value that meets the safety criterion by operating the temperature control knob 310, the control unit 300 compares the temperature sensed by the temperature sensor 410, which will be described later, The power is applied to the heating element 210. On the contrary, when the heating temperature is higher than the set temperature, the power source applied to the heating element 210 is shut off repeatedly.

The control unit 300 is electrically connected to the micro switch 500, the heating element 210, the temperature sensor 410, and the power switch (not shown).

The temperature sensing tube 400 is made of a metal tube having a predetermined diameter and a predetermined length so that an upper portion of the temperature sensing tube 400 inserted into the body case 100 is electrically connected to a ground terminal of the plug P, And is grounded through a grounding wire (E) and a plug (P) for connection to an external power source so as to prevent a safety accident such as electric shock due to a short circuit.

The upper end in the longitudinal direction of the temperature sensing tube 400 is inserted and fixed to the temperature sensing tube coupling part 120 formed on the lower surface of the main body case 100. When the external temperature is detected in the lower part, And the temperature sensor 410 is connected to the control unit 300 so as to control the operation of the heating element 210. The temperature sensor 410 is electrically connected to the control unit 300. [

In addition, the lower end of the temperature sensing pipe 400 in the longitudinal direction is formed and arranged to be positioned higher than the lower end of the heating pipe 200.

The micro switch 500 is built in the main body case 100 to open and close the power source of the heating element 210 according to the level of the object to be heated.

When the float 600 is lifted or lowered, the microswitch 500 opens and closes the contact so that the heating element 210 can be quickly and automatically shut off when the object to be heated contained in the water container becomes below a certain level.

That is, the micro switch 500 switches the power source to the heating element 210 while being switched by the float 600 rising by buoyancy when the heating object contained in the water bottle is above a certain level, and conversely, The float 600 is lowered due to its own weight, so that the switching is released and the power applied to the heating element 210 is cut off.

Since the microswitch 500 automatically cuts off power at low water level while repeating the series of reactions and processes, it is possible to prevent electric shock due to fire due to overheating or electric leakage.

The float 600 is located at a lower portion of the main body case 100 adjacent to the heating tube 200 and the temperature sensing tube 400 so as to open and close the power source of the heating element 210 while lifting and lowering according to the level of the object to be heated, The micro switch 500 incorporated in the main body case 100 is operated through the rod passing hole 150 formed in the lower surface of the case 100. The upper surface of the float 600 is connected to the upper surface of the main case 100 100 are integrally formed.

That is, the rod 610 of the float is moved up and down according to the height of the object to be heated contained in the water bottle, and the micro switch 500 contacts and closes the contact.

Here, the float 600 is formed to have buoyancy to float to the surface of the object to be heated, and the rod 610 of the float may be formed of stainless steel or the like to prevent corrosion and thermal deformation.

The ground line 700 is provided to electrically connect the heating pipe 200 and the temperature sensing pipe 400 to the ground terminal of the plug P. [

That is, the ground wire 700 is connected to the upper end of the heating tube 200 and the temperature sensing tube 400 located inside the heating tube coupling part 110 and the temperature sensing tube coupling part 120, Through a screw hole (H) formed to communicate with the heating tube coupling part (110) and the temperature sensing tube coupling part (120), respectively, and a thermally conductive screw (S) screwed thereto.

Therefore, it is possible to reliably prevent the ground wire 700 from being separated from the heating tube 200 by an external force such as shaking generated during use.

7, the underwater heater according to another embodiment of the present invention guides and supports the lifting and lowering of the float 600 around the lower outer surface of the heating tube 200 where the heating element 210 is located, A guide member 800 made of a conductive material for conducting heat and electricity is fixed and a conductive material for conducting heat and electricity is formed around the lower outer surface of the temperature sensing tube 400 in which the temperature sensor 410 is located A heat transfer member 900 is fixed, and the guide member 800 and the heat transfer member 900 are integrally formed.

That is, the guide member 800 is formed in the shape of wrapping a part of the longitudinal direction of the heating tube 200 and is in surface contact with the periphery of the lower outer surface of the heating tube 200, and the float 600 is stably lifted / And the heat transfer member 900 is formed around the lower outer surface of the temperature sensing pipe 400 where the temperature sensor 410 is located, And is connected to the guide member 800 in a surface contact state.

The guide member 800 and the heat transfer member 900 stably maintain the ground terminal and the grounding state of the plug P through the ground line 700 electrically connected to the temperature sensing pipe 400, 200 maintains a double ground state with the ground terminal of the plug P through the ground wire 700 electrically connected to the temperature sensing pipe 400 so that the safety is enhanced so that the electric shock due to the current leaking from the heating pipe 200 Thereby effectively preventing electric accidents and risks of the vehicle.

The temperature sensor 410 simultaneously detects the temperature of the heating tube 200 and the heating object which are transmitted through the guide member 800 and the heat transfer member 900. When the temperature of the heating object 200 is higher than a predetermined range, It is possible to more safely prevent an accident such as a fire due to overheating.

In addition, even when the water level of the object to be heated in the water bottle is low or the heating element 210 is abnormally overheated because there is no object to be heated, the temperature sensor 410 automatically cuts off the power source, so that the fire due to overheating can be prevented more effectively.

Here, among the constituent elements of the other embodiments of the present invention, constituent elements having the same or similar operational effects as those of the above-described embodiments are denoted by the same reference numerals, and repetitive detailed description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments or constructions. Various changes and substitutions may be made without departing from the spirit and scope of the invention. It will be apparent to those skilled in the art that changes may be made in the embodiments without departing from the spirit and scope of the invention.

Therefore, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

100: main body case 110: heating tube coupling part
120: temperature sensing pipe coupling part 130:
200: heating tube 210: heating element
220: filler
300: control unit 310: temperature control knob
400: Temperature sensing tube 410: Temperature sensor
500: Microswitch 600: Float
610: load 700: ground wire
800: guide member 900: heating member
P: Plug C: Conductor
H: Screw hole S: Screw

Claims (2)

A pair of heating tube coupling parts 110 and a temperature sensing tube coupling part 120 are formed in a hollow shape protruding at a predetermined interval from one side of the lower surface of the lower case and the locking part 130 is protruded on the other side of the lower surface, (100);
A heating element 210 is inserted into the heating tube coupling part 110 and electrically connected to the external power source through the plug P and the conductor C to generate heat when power is applied to the thermally conductive filler A heating pipe 200 enclosed in a lower portion 220;
A control unit 300 built in the body case 100 to control the temperature of the heating element 210 and to control the power supply;
An upper end is inserted into the temperature sensing pipe coupling part 120 and an operation control signal of the heating body 210 is transmitted to the control unit 300 according to the temperature change of the heating pipe 200 and the heating object A temperature sensing pipe 400 having a built-in temperature sensor 410 therein;
A micro switch 500 built in the main body case 100 to open / close a power source of the heating element 210;
A float 600 mounted on a lower portion of the main body case 100 to open and close the microswitch 500 while moving up and down according to a level of the object to be heated; And
The heating pipe 200 and the temperature sensing pipe 400 are electrically connected to the ground terminal of the plug P and are positioned inside the heating pipe coupling part 110 and the temperature sensing pipe coupling part 120. The upper end of the heating tube 200 and the temperature sensing tube 400 are connected to the heating tube coupling portion 110 and the temperature sensing tube coupling portion 120 in the body case 100, A ground wire 700 connected through a threaded hole H and a thermally conductive screw S threaded thereto;
A movable water heater.
The method according to claim 1,
A conductive guide member 800 fixed around the lower outer surface of the heating tube 200 where the heating element 210 is located and guiding and supporting the float 600 up and down; And
A heating member 900 integrally formed with the guide member 800 and fixed around a lower outer surface of the temperature sensing tube 400 where the temperature sensor 410 is located;
Further comprising: a movable water heater.

Images