WO2007073050A1

WO2007073050A1 - Thermoelectrical work plate

Info

Publication number: WO2007073050A1
Application number: PCT/KR2006/005387
Authority: WO
Inventors: Byoung-Goan Park; Young-Wha Park; Norbert Pack
Original assignee: Byoung-Goan Park; Young-Wha Park; Norbert Pack
Priority date: 2005-12-22
Filing date: 2006-12-11
Publication date: 2007-06-28
Also published as: KR20070066612A; KR100804906B1

Abstract

Provided is a thermoelectrical workplate required to work using chemical materials in a dental clinic and a dental laboratory.

Description

THERMOELECTRICAL WORK PLATE

Technical Field The present invention relates to a thermoelectrical workplate required to work using chemical materials in a dental clinic or a dental laboratory, and more particularly, to a thermoelectrical workplate in which, when work is performed for a predetermined purpose using a variety of predetermined materials causing a change of character according to temperature or humidity in both a chemical laboratory or a hospital laboratory and a dental laboratory or a chemical workroom, the predetermined materials are kept at the constant temperature at which an internal pad and a surface pad are set and the humidity of the predetermined materials is constantly kept so that a change of material properties and evaporation of moisture are prevented so as to increase a working efficiency and damage and waste of materials is reduced so as to increase an economic efficiency, the thermoelectrical workplate is manufactured to the smallest height so that a worker does not use the wrist excessively when working on a desk, so as to reduce worker's fatigue, the optimum result is obtained in a long-term work or an elaborate work, and the thermoelectrical workplate can be carried by the worker so that mobility is improved.

Background Art Generally, when a predetermined work is performed using materials which cause a chemical reaction or whose character is changed according to temperature or humidity, temperature or environment that is proper to an object to work must be constantly kept so that a change in character of the object to work is suppressed or the state in which a change in character of the object to work occurs is kept. Until now, in order to satisfy these working conditions, requirements are met in equipment or a device having sealed space and then, a portion of materials is taken off and work is performed by a small amount of materials so that damage of the materials is prevented.

However, a working efficiency and worker's concentration are lowered due to such a working pattern, and an identical character cannot be easily kept between objects to work in a continuous and precise work as time elapses. Thus, it is very difficult to achieve required work completely.

Equipment for satisfying the above-described working conditions is too large and too heavy to be carried by a person and thus, mobility is low and there are many restrictions in usage.

For example, in view of dental crafts, dental craftsmen manufacture a denture while sitting in one place for a long time. Thus, the denture must be manufactured to have color harmony with that of another denture of a user to whom the manufactured denture is implanted. Thus, a sample photograph of tooth to be implanted is placed in working space and then is compared with a denture to be manufactured to gradually form the denture for a long time.

Here, a ceramic material, a high-performance adhesive (cement) or the like required for forming a denture has been traded at very high prices, and work thereof is very complicated.

In detail, when cement used in adhering tooth is cooled at proper temperature, time when cement is solidified is delayed and a working time is increased up to three or four times time when cement is used at room temperature so that a worker frees himself/herself from burden in which the worker must complete work within a predetermined short time and completeness of work is improved. In spite of that, since humidity of cement is increased due to ambient temperature and humidity, a change of character occurs and thus, a working time is reduced. Thus, a delicate and sophisticated technique is indispensable for work of a sensitive object such as tooth. The delicate and sophisticated technique can be carried out only when there is an enough working time. Thus, a function for minimizing a change in character of materials affects the good working result and reduction in psychological fatigue of the worker in sophisticated work. Furthermore, dental craftsmen usually work by moving a work place to the vicinity of a dental clinic in which a corresponding work is required, according to type of dental craft work. On the other hand, equipment and device for satisfying the above-described requirements are heavy bodies and thus cannot be easily carried or moved. Thus, there are difficulties in setting a working environment.

In particular, since dental craftsmen work for completing tooth on the desk for a long time, as a difference between heights of a workplate on which cement is put and the desk is reduced, a working speed and completeness of work are increased and physical and psychological fatigue is reduced. In spite of that, until now, there is no device for achieving such a purpose or equipment which can be conveniently carried and moved and satisfies predetermined environment conditions. Thus, work thereof is not efficient.

Disclosure of the Invention

The present invention provides a thermoelectrical workplate in which predetermined environment conditions are satisfied, the workplate is kept at constant temperature required for the workplate, conditions in which character of materials to work are not changed are kept for a long time and simultaneously, the size and weight of the workplate are minimized so that the workplate can be freely carried and moved, the height of a device is minimized so as to increase completeness of work and a working efficiency during long-term work or precise work so that the optimum working result can be obtained and physical and psychological fatigue of a worker can be reduced.

According to an aspect of the present invention, there is provided a thermoelectrical workplate, the thermoelectrical workplate including: a housing 101 in which a seating groove 102 having predetermined shape and width and which has an opened lower portion in which a bottom plate 103 is fixed by bolt; a thermoelectric module 106 attached to an upper portion of a thermal conductive fixing member 104 bolt-coupled to a bottom portion of the seating groove 102 and inserted and combined in a module installation hole 105 fixed in a bottom surface of the seating groove 102; a heat pipe 109 whose one end is inserted and combined in at least one fixing hole 107 formed in the fixing member 104 and which is inserted and combined in heat dissipation holes 108a formed in a plurality of heat dissipation plates 108 in the rear of the inside of the housing 101 ; a cooling fan 129 disposed on a rear surface of the heat dissipation plate 108 and dissipating heat transmitted to the heat dissipation plate 108 to an outside of the housing 101 ; an internal pad 1 10 which is seated on an upper portion in which the thermoelectric module 106 is inserted and combined in the module installation hole 105 and to which temperature is conducted according to heat-absorption and heat-dissipation of the thermoelectric module 106; a fixing bolt 126 which perforates into a first through hole 125 formed in the fixing member and a second through hole 127 formed in the seating groove 102 to correspond to the first through hole 125 and which is coupled to a screw hole 130 perforated in a predetermined position of a bottom portion of the internal pad 1 10; a temperature detection sensor 11 1 installed in a predetermined position of the seating groove 102 and detecting temperature of the internal pad 1 10; and a controller (not shown) controlling power supply and driving of the cooling fan 129 so that the internal pad 1 10 can be kept at a constant temperature at which the internal pad 1 10 is set according to temperature detected by the temperature detection sensor 11 1. Heat-absorption and heat-dissipation may be selectively performed on upper and lower surfaces of the thermoelectric module 106 through power supply control of the controller through selective manipulation of an operational panel 112 installed in a predetermined position of the housing 101. The thermoelectrical workplate may further include an insulation member 113 interposed between the seating groove 102 and the internal pad 110 and preventing heat generated in the thermoelectric module 106 and interference with the internal pad 110.

The thermoelectrical workplate may further include: a support jaw 114 formed in an upper end circumferential portion of the seating groove 102; a guide 115 having a predetermined length and formed in a predetermined position of the support jaw 114 to be protruded upwards; and a surface pad 116 for thermal conduction seated on an upper portion of the internal pad 110 and the support jaw 114. The thermoelectrical workplate may further include an opening and closing member 117 having a cap shape to close the upper portion of the internal pad 110. The thickness of the internal pad 110 become gradually thinner from the center toward the edge of it so that thermal conductivity by the thermoelectric module 106 is uniform. A thermal conduction groove 118 may be further formed to a predetermined depth in an upper surface corresponding to a bottom surface to which the thermoelectric module 106 is closely attached. The thermoelectrical workplate may further include a thermal spreader 119 installed to be closely adhered to the upper portion of the thermoelectric module 106 and the bottom portion of the internal pad 110 so that warm heat and cool heat according to the operation of the thermoelectric module 106 can be rapidly dispersed and conducted to the internal pad 110.

The thermoelectrical workplate may further include at least one auxiliary pad 120 disposed on an upper portion of one of the internal pad 110 and the surface pad 116.

According to another aspect of the present invention, there is provided a thermoelectrical workplate, the thermoelectrical workplate including: a housing 101 in which a pad insertion hole 121 having predetermined shape and width is formed and which has an opened lower portion in which a bottom plate 103 is fixed by bolt; a thermoelectric module 106 fixedly installed on an upper surface of a heat dissipation plate 108 installed in an upper portion of the bottom plate 103 so that heat-absorption and heat-dissipation are selectively performed on upper and lower surfaces of the thermoelectric module 106 through power supply control of the controller through selective manipulation of an operational panel 112 installed in a predetermined position of the housing 101 ; a cooling fan 129 installed in a predetermined position of a side end of the heat dissipation plate 108 and dissipating heat transmitted to the heat dissipation plate 108 to an outside of the housing 101 ; an internal pad 110 which is inserted in the pad insertion hole 121 , seated on an upper surface of the thermoelectric module 106 and to which temperature is conducted according to heat-absorption and heat-dissipation of the thermoelectric module 106; a temperature detection sensor 111 installed to be closely attached to a bottom surface of the internal pad 110 and detecting temperature of the internal pad 110; and a controller (not shown) controlling power supply and driving of the cooling fan 129 so that the internal pad 110 can be kept at a constant temperature at which the internal pad 110 is set according to temperature detected by the temperature detection sensor 111.

The thermoelectrical workplate may further include: a support jaw 114 formed in an upper end circumferential portion of the pad insertion hole 121 ; a guide 115 having a predetermined length and formed in a predetermined position of the support jaw 114 to be protruded upwards; and a surface pad 116 for thermal conduction seated on an upper portion of the internal pad 110 and the support jaw 114. The thermoelectrical workplate may further include an opening and closing member 117 having a cap shape to close the upper portion of the internal pad 110 and an insulation member 113 circumscribing an external end of the thermoelectric module 106 at an upper end of the heat dissipation plate 108, installed to be closely to a bottom surface of the internal pad and preventing heat generated in the heat dissipation plate 108 and the thermoelectric module 106 from being interfered with the internal pad 110. According to another aspect of the present invention, there is provided a thermoelectrical workplate, the thermoelectrical workplate including: a housing 101 in which a seating groove 102 having predetermined shape and width and which has an opened lower portion in which a bottom plate 103 fixed by bolt; a water jacket 122 which is disposed in a bottom portion of the seating groove 102 and in which a groove 122c in which a thermoelectric module 106 is fixedly inserted, is formed in an upper portion of the water jacket 122 so that the water jacket 122 is inserted and combined in a module installation hole 105 formed a bottom surface of the seating groove 102; a heat transmission tube 123 connected to the water jacket 122 and a heat dissipation hole 108a of the heat dissipation plate 108 installed in the rear of an inside of the housing 101 and transmitting heat generated in the thermoelectric module 106 to the heat dissipation plate 108; a pump 128 combined with one of the heat transmission tube 123 and the water jacket 122 and circulating cooling water; a cooling fan 129 disposed on a rear surface of the heat dissipation plate 108 and dissipating heat transmitted to the heat dissipation plate 108 to an outside of the housing 101 ; an internal pad 110 which is seated on an upper portion in which the thermoelectric module is inserted and combined in the module installation hole 105 and to which temperature is conducted according to heat-absorption and heat-dissipation of the thermoelectric module 106; a fixing bolt 126 which perforates into a third through hole 131 formed in a predetermined position of an outer circumferential portion of the water jacket 122 and a second through hole 127 formed in the seating groove 102 to correspond to the third through hole 131 and which is coupled to a screw hole 130 perforated in a predetermined position of a bottom portion of the internal pad 110; a temperature detection sensor 111 installed in a predetermined position of the seating groove 102 and detecting temperature of the internal pad 1 10; and a controller (not shown) controlling power supply and driving of the cooling fan 129 so that the internal pad 110 can be kept at a constant temperature at which the internal pad 1 10 is set according to temperature detected by the temperature detection sensor 1 1 1.

Brief Description of the Drawings FIG. 1 illustrates the appearance of a thermoelectrical workplate according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating the structure of the thermoelectrical workplate illustrated in FIG. 1.

FIG. 3 is a cross-sectional view illustrating the structure of the thermoelectrical workplate taken a line A-A of FIG. 1.

FIG. 4 illustrates the appearance of a thermoelectrical workplate according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view illustrating the structure of the thermoelectrical workplate illustrated in FIG. 4. FIG. 6A is a cross-sectional view illustrating the structure of the thermoelectrical workplate taken a line B-B of FIG. 4.

FIG. 6B illustrates the state in which an insulation member is inserted and combined between a heat-dissipating plate and an internal pad in FIG. 6A. FIGS. 7A, 7B, 7C, 7D, and 7E illustrate the structure of an internal pad according to the present invention according to types.

FIGS. 8A, 8B, and 8C illustrate the structure of a heat pipe of the thermoelectrical workplate illustrated in FIG. 1.

FIG. 9 illustrates a thermoelectrical workplate according to a third embodiment of the present invention. Best mode for carrying out the Invention

Hereinafter, a thermoelectrical workplate according to the present invention will be described with reference to FIGS. 1 through 9.

In an embodiment of a thermoelectrical workplate according to the present invention, a housing 101 in which predetermined space is obtained, has an opened lower portion, as illustrated in FIGS. 1 , 2, and 3. The opened lower portion is closed when a bottom plate 103 is bolted by a fixing screw 124.

Here, a circular seating groove 102 having a predetermined size is formed on the housing 101 , and a module installation hole 105 is formed in the middle portion of the seating groove 102 so that a thermoelectric module 106 that will be described later can be inserted in the module installation hole 105.

As illustrated in FIG. 2, after the thermoelectric module 106 is interposed between an upper portion of the bottom plate 103 and an upper portion of a fixing member 104 formed of aluminum or ceramics having excellent thermal conductivity and the thermoelectric module 106 is inserted and combined in the module installation hole 105 of the seating groove 102 formed in an upper portion of the housing 101 , a fixing bolt 126 is perforated into a second through hole 127 of the seating groove 102 through a first through hole 125 of the fixing member 104 to be coupled to a bottom screw hole 130 of an internal pad 110 seated on the seating groove 102 so that the thermoelectric module 106 can be firmly combined with the seating groove 102 and the internal pad 110. As described above, the internal pad 110 and the thermoelectric module 106 are closely adhered to each other and fixed by the fixing bolt 126, thereby improving thermal conductivity. It is preferable to use cooling grease so that a noncontact surface (an air layer) is not formed due to a surface tolerance which can occur between an upper surface of the thermoelectric module 106 and a lower surface of the internal pad 1 10. Here, a structure for coupling the fixing member 104 to the seating groove 102 using the fixing bolt 126 and a configuration for coupling and fixing the bottom plate 103 to the lower portion of the housing 101 using the fixing screw 124 are common combination structures. Thus, the present invention does not limit these combination means, and the combination structures do not affect the operation and effect of the invention and the present invention is not limited to this. As described above, if the thermoelectric module 106 is inserted in the module installation hole 105 of the seating groove 102, the internal pad 110 formed of a material having excellent thermal conductivity (for example, an aluminum plate or a copper plate etc.) is seated on the seating groove 102. As separately illustrated in FIG. 3, the fixing bolt 126 is perforated into the first through hole 125 of the fixing member 104 and the second through hole 127 formed in a bottom surface of the seating groove 102, the fixing bolt 126 is coupled to the screw hole 130 of the internal pad 110, and the thermoelectric module 106 is closely adhered and fixed to the bottom surface of the internal pad 110.

Here, an insulation member 113 is disposed in a lower portion of the internal pad 110 and a fourth through hole 132 may be perforated into the insulation member 113 so that the fixing bolt 126 can be perforated into the fourth through hole 132.

Thus, a difference between temperature of the internal pad 110 and temperature of the lower portion (inside the housing 101 ) of the seating grove 102 is minimized in the state where the internal pad 110 is conducted by the thermoelectric module 106 so that a dewing phenomenon does not occur in the seating groove 102.

In detail, when the thermoelectric module 106 cools the internal pad 110, the insulation member 113 prevents heat generated in the fixing member 104 from being conducted to the internal pad 110 through the seating groove 102 while heat is conducted from the thermoelectric module 106 to the fixing member 104 and simultaneously prevents heat generated in the thermoelectric module 106 from being conducted to the internal pad 110, and the air layer formed in a lower end of the internal pad 110 and the internal pad 110 do not contact each other so that a dewing phenomenon due to a temperature difference between the air layer and the internal pad 110 can be prevented.

Furthermore, it is preferable that the thermoelectric module 106 is prevented from being interfered with the insulation member 113 by forming a section portion 113a in the insulation member 113 to correspond to the size of the thermoelectric module 106 so that the thermoelectric module 106 can be closely adhered to the bottom surface of the internal pad 110 when the insulation member 113 is disposed in the lower portion of the internal pad 110.

Here, as illustrated in FIGS. 2 and 3, a temperature detection sensor 111 is installed on the bottom surface of the internal pad 110 to be closely adhered thereto and detects temperature of the internal pad 110 to which heat is conducted by the thermoelectric module 106. A controller controls power supply and driving of a cooling fan 129 so that temperature at which the internal pad 110 is set can be kept due to the detected temperature. As a result, temperature of the internal pad 110 is constantly kept.

A support jaw 114 that is parallel to an upper surface of the seating groove 102 is formed in an upper end circumferential portion of the seating groove 102, and a guide 115 is formed in a predetermined position of an outer circumferential portion of the support jaw 114 to be protruded upwards along the outer circumferential portion. Thus, when a worker rotates a surface pad 116, deviation of the surface pad 116 is prevented and foreign matters are prevented from being dropped from an upper portion of the surface pad 116 so as not to enter into the device.

When the surface pad 116 having excellent thermal conductivity (for example, ceramic materials or reinforced glass etc.) is seated on the upper surfaces of the support jaw 114 and the seating groove 102 and an inside of the guide 1 15 and the worker holds the surface pad 116 to rotate it, the surface pad 116 is self rotated inside the guide 1 15. Thus, the worker may dispose various materials put on the surface pad 116 by rotating the materials toward a predetermined position and working space can be more efficiently utilized.

In addition, as illustrated in FIGS. 1 and 2, a cap-shaped opening member 1 17 is covered by the upper portion of the internal pad 1 10 so as to close the upper portion of the internal pad 1 10, or the opening member 117 is covered in the state where the surface pad 1 16 is seated on the upper portion of the internal pad 110, as illustrated in FIG. 3. Thus, it is preferable that, even though the worker does not work for a long time, temperature of the internal pad 110 or the surface pad 116 is constantly kept.

It is preferable that the controller allows that heat-absorption and heat-dissipation are selectively performed on the upper surface of the thermoelectric module 106 through selective manipulation of an operational panel 1 12 installed in a predetermined position of the housing 101. In this case, heat-dissipation and heat-absorption are relatively performed on a lower surface of the thermoelectric module 106, and if heat is absorbed into the upper surface of the thermoelectric module 106 and the internal pad 1 10 is cooled, relatively considerable heat is generated in the lower portion of the thermoelectric module 106.

As illustrated in FIGS. 2 and 3, when a heat pipe 109, which is combined with heat dissipation holes 108a respectively formed in a heat dissipation plate 108 in the rear of the inside of the housing 101 , is inserted and combined in a plurality of fixing holes 107 formed in the fixing member 104 for fixing the thermoelectric module 106 and heat is absorbed into the upper surface of the thermoelectric module 106, heat is dissipated from the lower surface of the thermoelectric module 106. In this case, heat generated in the lower surface of the thermoelectric module 106 is rapidly conducted to the heat dissipation plate 108, and the cooling fan 129 installed on a side end of the heat dissipation plate 108 dissipates heat conducted to the heat dissipation plate 108 to the outside of the housing 101 so that heat generated in the lower surface of the thermoelectric module 106 is rapidly absorbed and cooled.

As illustrated in FIGS. 8A, 8B, and 8C, the heat pipe 109 may have a cylindrical shape but may also have a rectangular shape, a quadrangular shape or an elliptical shape.

Briefly describing in relation to the above-described heat pipe 109, a core structure of the heat pipe 109 which is a heat transmission medium, is a wick 109a illustrated in FIG. 8A. The wick 109a has an internal capillary structure in which a working fluid in a liquid state is returned to an evaporation portion from a condensation portion and usually has a mesh or groove shape. This causes a capillary phenomenon due to surface tension of liquid, and an electromagnetic force, a centrifugal force, an osmotic pressure, and gravity as well as capillary may be used in returning of liquid.

The heat pipe 109 injects the working fluid into a sealed container then exhausts the working fluid in a vacuum state. The heat pipe 109 is constructed so that, if one end of the heat pipe 109 is heated, the working fluid inside the heat pipe 109 is vaporized and moves to another place due to a pressure difference and the heat pipe 109 dissipates heat toward an ambient portion and is returned to a heating portion through condensation. Materials causing a capillary force may be inserted into the heat pipe 109 according to purposes, and the heat pipe 109 is a vacuum sealed container. A porous wick 109a is installed on inner walls of the container, and a very small amount of the liquid working fluid is saturated inside the wick 109a, as illustrated in FIG. 8A. A container evaporation portion is a vapor path for the working fluid. The heat pipe 109 includes three elements, such as an evaporation portion, a condensation portion, and an insulation portion in a lengthwise direction. If the evaporation portion is heated, heat is absorbed as vaporization heat of liquid and vapor is transferred to the condensation portion, and if heat is dissipated from the condensation portion, the vapor is condensed and is absorbed into the wick 109a.

A condensation solution may be returned to the evaporation portion due to a capillary pressure difference generated at an interface between gas and liquid of the wick 109a between the condensation portion and the evaporation portion. In this way, the working fluid performs a phase change cycle so that heat can be transferred to the condensation portion from the evaporation portion without applying an external power.

When gravity is used, an internal capillary structure is not necessary and in particular, is referred to as thermosyphon. An operating principle and application of thermosyphon illustrated in FIG. 8C are similar to those of a heat pipe except that a working fluid condensed by a condensation portion is returned to a heating portion by gravity and thus the heating portion must be placed under the condensation portion. Thus, thermosyphon illustrated in FIG. 8C is also referred to as a wickless heat pipe.

The internal pad 110 is formed to have a shape of gradually thinner from the center toward the edge of it so that thermal conductivity due to the thermoelectric module 106 is uniformly applied to the internal pad 110, or the internal pad 110 may also form a thermal conduction groove 118 to a predetermined depth in an upper surface corresponding to the bottom surface to which the thermoelectric module 106 is closely adhered, and as illustrated in FIGS. 7A, 7B, 7C, and 7D, the internal pad 110 may have a shape of gradually thinner from the center toward the edge of it and simultaneously, may form the thermal conduction groove 1 18. Thus, it is preferable that a temperature difference between the middle portion and the outer portion of the internal pad 110 can be minimized during thermal conduction through the thermoelectric module 106. If necessary, as illustrated in FIG. 7E, a thermal spreader 1 19 is installed to be closely adhered to the upper portion of the thermoelectric module 106 and the bottom portion of the internal pad 1 10 so that warm heat and cool heat according to the operation of the thermoelectric module 106 can be rapidly dispersed and conducted to the internal pad 1 10. Furthermore, as illustrated in FIG. 1 , if the surface pad 1 16 is seated on the internal pad 110, a plurality of auxiliary pads 120 each having a comparatively small size are disposed on the upper surface of the surface pad 116 so that ink or cement can be put in each auxiliary pad 120. Thus, it is preferable that the internal pad 1 10 can be cleanly used and simultaneously, ink and cement can be conveniently used.

Meanwhile, a thermoelectrical workplate according to a second embodiment of the present invention is as illustrated in FIGS. 4, 5, 6A, and 6B. The housing 101 according to the first embodiment of the present invention) includes the seating groove 102, whereas in the second embodiment, a pad insertion hole 121 having a predetermined shape is formed in a housing 101. Other constructions of a bottom plate 103, a cooling fan 129, and a thermoelectric module 106 are the same as those of the first embodiment and thus, a detailed description thereof will be omitted. Here, the thermoelectric module 106 according to the first embodiment is fixed on the seating groove 102 by the fixing member 104, whereas the thermoelectric module 106 according to the second embodiment is fixedly installed on a heat dissipation plate 108 because the heat dissipation plate 108 is disposed on the bottom plate 103. Thus, the heat pipe 109 which is a heat transmission medium in the first embodiment, is not installed on the lower surface of the thermoelectric module 106 according to the second embodiment. As a result, heat generated in the lower surface of the thermoelectric module 106 according to the second embodiment is transmitted to the heat dissipation plate 108 installed under the thermoelectric module 106, and heat transmitted to the heat dissipation plate 108 is dissipated to the outside of the housing 101 by the cooling fan 129 installed at a rear end of the thermoelectric module 106 so that the lower surface of the thermoelectric module 106 can be rapidly cooled.

The internal pad 110 is inserted into the pad insertion hole 121 and is seated on the thermoelectric module 106. Above the internal pad 110, the surface pad 116 is seated on a support jaw 114 and the internal pad 110, so as to rotate along a guide 115 by worker's intention.

As illustrated in FIGS. 5, 6A, and 6B, a temperature detection sensor 111 is closely adhered to the bottom surface of the internal pad 110. The temperature detection sensor 111 detects temperature of the internal pad 110, and a controller controls power supplied to the thermoelectric module 106 so that temperature of the internal pad 110 can be constantly kept due to the detected temperature.

Even in the second embodiment of the present invention, an insulation member 113 is installed so that a dewing phenomenon caused by a difference between temperature of the internal pad 110 and temperature inside the housing 101 can be prevented. Thus, the insulation member 113 is interposed between the internal pad and the upper surface of the heat dissipation plate 108, as illustrated in FIG. 6B, so that a dewing phenomenon due to a temperature difference between upper and lower portions of the insulation member 113 can be prevented.

Meanwhile, all constructions of a third embodiment according to the present invention is the same as those of the first embodiment in that heat dissipated from the lower surface of the thermoelectric module 106 is transmitted to the rear of the housing 101 and is cooled by the cooling fan 129 from the heat dissipation fan 108. However, the third embodiment is different from the first embodiment in that a cooling water technique is adopted as a means for transmitting heat of the thermoelectric module 106 from the fixing member 104 to the heat dissipation plate 108. Thus, only a construction of the heat transmission means of the thermoelectric module 106 will now be described.

That is, in the first embodiment, the thermoelectric module 106 is installed on the bottom surface of the seating groove 102 by the fixing member 104. However, in the third embodiment, the thermoelectric module 106 is inserted into and combined with a groove 122c formed in the upper portion of a water jacket 122 in which cooling water is circulated, and then, the thermoelectric module 106 is bolt-coupled to the bottom portion of the seating groove 102, as illustrated in FIG. 9.

Furthermore, heat transmission tubes 123 are connected to an inlet part 122a and an outlet part 122b of the water jacket 122, respectively. The heat transmission tubes 123 are connected up to heat dissipation holes 108a. A pump 128 is combined with the water jacket 122 or space between the heat transmission tubes 123 and then is pumped so that cooling water can be circulated up to the heat dissipation plate 108. Thus, heat transmitted to the heat dissipation plate 108 is dissipated to the outside of the housing 101 by the cooling fan 129 and thus can be cooled.

As illustrated in FIGS. 1 , 4, and 9, it is preferable that, in each embodiment of the thermoelectrical workplate according to the present invention, a cap-shaped opening and closing member 1 17 covers the surface pad 1 16 or the internal pad 110, so as to keep temperature and humidity of the internal pad 1 10.

According to the first, second, and third embodiments of the present invention, a specific work requires that an object to work is kept in a proper humidity state in addition to provision of a change in character of the object to work or optimum work conditions. To this end, if temperature of the internal pad 110 is lower than ambient temperature, temperature of the internal pad 1 10 and temperature of the object to work are lower than atmospheric temperature by predetermined temperature or higher. Thus, moisture evaporation of the object to work is reduced and simultaneously, interior air is slightly dew-condensed by a dew condensation phenomenon on the object to work and the workplate, as illustrated in FIGS. 3 and 6A. Thus, moisture naturally and gradually evaporated to the air is reserved so that moisture can be always kept to a proper level.

In detail, even though humidity is not supplied using other separate methods, moisture can be kept to be most similar to an initial state or a state required for the object to work and type of work so that the good working results can be obtained, damage and waste of materials can be minimized and an economic efficiency is increased.

For example, when a material whose character are rapidly changed according to humidity like being solidified due to evaporation of moisture when high-performance liquid cement is opened to room temperature should be rapidly treated once sealed package is opened. This is because a change of character like being solidified due to evaporation of moisture according to time occurs and the same character cannot be kept and hindrance occurs during use for the original purpose.

In addition, for this reason, if a user in a dental laboratory or a dentist works in a hurry, there is a worry about losing concentration required in a delicate work, which makes a large hindrance cause in sophisticated and precise work.

In this case, if temperature of a workplate is reduced to be a predetermined temperature or lower than ambient temperature, a dew condensation phenomenon occurs in the workplate and the object to work, as described above, environment in which the object to work is controlled to proper humidity. As a result, a change of character can be prevented for a long time. Thus, a change of character can be prevented even in long-term work, a working time can be increased if necessary and waste of working materials can be reduced.

In addition, when work must be stopped for a predetermined amount of time, the same character can be kept. When the upper portion of the surface pad 116 is covered with the opening and closing member 117 as illustrated in FIG. 3, a change of character can be minimized for a considerable time so that damage or waste of an object to work is prevented. As a specific example, various workplates in which ceramic powder is kneaded with water, have been currently used in a dental laboratory so as to manufacture ceramic tooth. When the ceramic powder is kneaded with water, the degree of moisture must be constantly kept until work is completed from the beginning so that the best ceramic tooth can be manufactured. In this case, if the concentration of moisture is changed, the density of the ceramic powder is changed in each portion of the ceramic tooth and if the ceramic tooth is baked in an iron pot in this state, the results that cracks occur in the ceramic tooth or hardness or transparency is changed in each portion of the ceramic tooth, are generated.

In addition, even in watercolor painting, when dyestuffs are kneaded with alcohol, alcohol is quickly evaporated and thus, alcohol must be occasionally sprayed so that the dyestuffs are not dried. In this case, if temperature of the internal pad 110 is lower than ambient temperature, evaporation of alcohol can be greatly reduced than during work at room temperature. Thus, waste of materials can be prevented and the state of the dyestuffs can be kept as a painter intends.

In case of sophisticated work by hand, the result of the work depends on working technology by human hand and skillfulness of a worker. When the height of the workplate is high, the worker cannot do the work in a stable state where wrist is fixed on a desk. Even for a skilled person, the precision of the work is greatly lowered and fatigue of the worker is accordingly increased.

Thus, it is essential to minimize the height of the workplate for stable work. To this end, a forcible cooling method by which micromini cooling and heating elements, such as the thermoelectric module 106 and the heat pipe 109, are used, heat generated during cooling is transmitted to the rear heat dissipation plate 108 through the heat pipe 109 or the water jacket 122 and the heat transmission tubes 123 and then is cooled by the cooling fan 129 is used in the present invention. Thus, the workplate can be designed to be less than the height (usually, 3.5 cm or less) in which the worker can do work on the object to work on the workplate while fixing wrist on the desk.

Furthermore, the present invention adopts a method by which heat generated in the lower surface of the thermoelectric module 106 is forcibly absorbed and is transmitted to the rear so as to increase the cooling efficiency of the thermoelectric module 106 and then is forcibly cooled by the cooling fan 129. The temperature detection sensor 1 1 1 always detects temperature of the internal pad 110 and the controller controls the thermoelectric module 106 according to the detected temperature so that set temperature can be controlled in the operational panel 1 12 of the worker in units of 0.1 ⁰C from 0^°C to 80 ^°C (if necessary, -30^°C to 200⁰C ).

Industrial Applicability According to the present invention, firstly, when materials having various shapes such as liquid or solid or gas are melted or hardened or when predetermined working environment conditions that moisture evaporation is prevented or evaporation is induced are required, working environment is constituted so as to satisfy the conditions, and temperature conditions required even in an opened state at room temperature can be easily and precisely controlled.

Secondly, in case of work requiring precision and long term, the worker can do the work in a stable state while fixing wrist on the desk such that fatigue of the worker is reduced and the optimum working results can be achieved.

Thirdly, the height of the workplate is greatly reduced, heat generated in a thermoelectric module is forcibly absorbed and then is induced to the rear heat dissipation plate and is dissipated to the cooling fan and the thermoelectric module is forcibly cooled and cooling water absorbs heat generated in the thermoelectric module and heat is cooled in the rear such that an object to work is kept on an internal pad or a surface pad at constant temperature or humidity and a change of character of the object to work is prevented and a change of character of materials is suppressed to the minimum and an economic effect that waste of materials can be prevented is obtained.

Claims

What is claimed is:

1. A thermoelectrical workplate comprising: a housing in which a seating groove having predetermined shape and width and which has an opened lower portion in which a bottom plate is fixed by bolt; a thermoelectric module attached to an upper portion of a fixing member disposed in a bottom portion of the seating groove and inserted and combined in a module installation hole fixed in a bottom surface of the seating groove; a heat pipe whose one end is inserted and combined in at least one fixing hole formed in the fixing member and which is inserted and combined in heat dissipation holes formed in a plurality of heat dissipation plates in the rear of the inside of the housing; a cooling fan disposed on a rear surface of the heat dissipation plate and dissipating heat transmitted to the heat dissipation plate to an outside of the housing; an internal pad which is seated on an upper portion in which the thermoelectric module is inserted and combined in the module installation hole and to which temperature is conducted according to heat-absorption and heat-dissipation of the thermoelectric module; a fixing bolt which perforates into a first through hole formed in the fixing member and a second through hole formed in the seating groove to correspond to the first through hole and which is coupled to a screw hole perforated in a predetermined position of a bottom portion of the internal pad; a temperature detection sensor installed in a predetermined position of the seating groove and detecting temperature of the internal pad; and a controller controlling power supply and driving of the cooling fan so that the internal pad can be kept at a constant temperature at which the internal pad is set according to temperature detected by the temperature detection sensor.

2. The thermoelectric workplate of claim 1 , wherein heat-absorption and heat-dissipation are selectively performed on upper and lower surfaces of the thermoelectric module through power supply control of the controller through selective manipulation of an operational panel installed in a predetermined position of the housing.

3. The thermoelectrical workplate of claim 1 , further comprising an insulation member interposed between the seating groove and the internal pad and preventing heat generated in the thermoelectric module and interference with the internal pad.

4. The thermoelectrical workplate of claim 1 , further comprising: a support jaw formed in an upper end circumferential portion of the seating groove; a guide having a predetermined length and formed in a predetermined position of the support jaw to be protruded upwards; and a surface pad for thermal conduction seated on an upper portion of the internal pad and the support jaw.

5. The thermoelectrical workplate of claim 1 , further comprising an opening and closing member having a cap shape to close the upper portion of the internal pad.

6. The thermoelectrical workplate of claim 1 , wherein the internal pad has a shape of gradually thinner from the center toward the edge of it so that thermal conductivity by the thermoelectric module is uniform.

7. The thermoelectrical workplate of claim 1 , wherein a thermal conduction groove is further formed to a predetermined depth in an upper surface corresponding to a bottom surface to which the thermoelectric module is closely attached.

8. The thermoelectrical workplate of claim 1 , further comprising a thermal spreader installed to be closely adhered to the upper portion of the thermoelectric module and the bottom portion of the internal pad so that warm heat and cool heat according to the operation of the thermoelectric module can be rapidly dispersed and conducted to the internal pad.

9. The thermoelectrical workplate of one of claims 1 and 4, further comprising at least one auxiliary pad disposed on an upper portion of one of the internal pad and the surface pad.

10. A thermoelectrical workplate comprising: a housing in which a pad insertion hole having predetermined shape and width is formed and which has an opened lower portion in which a bottom plate is fixed by bolt; a thermoelectric module fixedly installed on an upper surface of a heat dissipation plate installed in an upper portion of the bottom plate so that heat-absorption and heat-dissipation are selectively performed on upper and lower surfaces of the thermoelectric module through power supply control of the controller through selective manipulation of an operational panel installed in a predetermined position of the housing; a cooling fan installed in a predetermined position of a side end of the heat dissipation plate and dissipating heat transmitted to the heat dissipation plate to an outside of the housing; an internal pad which is inserted in the pad insertion hole, seated on an upper surface of the thermoelectric module and to which temperature is conducted according to heat-absorption and heat-dissipation of the thermoelectric module; a temperature detection sensor installed to be closely attached to a bottom surface of the internal pad and detecting temperature of the internal pad; and a controller controlling power supply and driving of the cooling fan so that the internal pad can be kept at a constant temperature at which the internal pad is set according to temperature detected by the temperature detection sensor.

11. The thermoelectrical workplate of claim 10, further comprising: a support jaw formed in an upper end circumferential portion of the pad insertion hole; a guide having a predetermined length and formed in a predetermined position of the support jaw to be protruded upwards; and a surface pad for thermal conduction seated on an upper portion of the internal pad and the support jaw.

12. The thermoelectrical workplate of claim 10, further comprising an opening and closing member having a cap shape to close the upper portion of the internal pad.

13. The thermoelectrical workplate of claim 10, further comprising an insulation member circumscribing an external end of the thermoelectric module at an upper end of the heat dissipation plate, installed to be closely to a bottom surface of the internal pad and preventing heat generated in the heat dissipation plate and the thermoelectric module from being interfered with the internal pad.

14. A thermoelectrical workplate comprising: a housing in which a seating groove having predetermined shape and width and which has an opened lower portion in which a bottom plate is fixed by bolt; a water jacket which is disposed in a bottom portion of the seating groove and in which a groove in which a thermoelectric module is fixedly inserted, is formed in an upper portion of the water jacket so that the water jacket is inserted and combined in a module installation hole formed a bottom surface of the seating groove; a heat transmission tube connected to the water jacket and a heat dissipation hole of the heat dissipation plate installed in the rear of an inside of the housing and transmitting heat generated in the thermoelectric module to the heat dissipation plate; a pump combined with one of the heat transmission tube and the water jacket and circulating cooling water; a cooling fan disposed on a rear surface of the heat dissipation plate and dissipating heat transmitted to the heat dissipation plate to an outside of the housing; an internal pad which is seated on an upper portion in which the thermoelectric module is inserted and combined in the module installation hole and to which temperature is conducted according to heat-absorption and heat-dissipation of the thermoelectric module; a fixing bolt which perforates into a third through hole formed in a predetermined position of an outer circumferential portion of the water jacket and a second through hole formed in the seating groove to correspond to the third through hole and which is coupled to a screw hole perforated in a predetermined position of a bottom portion of the internal pad; a temperature detection sensor installed in a predetermined position of the seating groove and detecting temperature of the internal pad; and a controller controlling power supply and driving of the cooling fan so that the internal pad can be kept at a constant temperature at which the internal pad is set according to temperature detected by the temperature detection sensor.