JP7671850B2 - Heating device - Google Patents

Description

The present disclosure relates to a heating device. The heating device can be used, for example, to heat a mold for processing metal, glass, resin, or the like.

A known example of a heating device is a heating device relating to a method for joining a joint of metal plates described in Patent Document 1. Patent Document 1 describes a heating device that includes a heating plate, a cartridge heater inserted into the heating plate from the side, a top plate disposed above the upper heating plate, a base plate disposed below the lower heating plate, and insulating material provided between the upper heating plate and the top plate, and between the lower heating plate and the base plate.

The cartridge heaters are positioned along one direction parallel to the heating surface of the heating plate. As such, the distribution of the cartridge heaters inside the heating plate is not uniform, which can lead to temperature variations on the heating surface of the heating plate.

JP 2021-3885 A

The heating device of the present disclosure includes a metal plate and a plurality of heaters. The metal plate has a first surface that is a heating surface, a second surface located opposite the first surface and having a plurality of recesses, and a third surface that is connected to each of the first surface and the second surface. The plurality of heaters are located in each of the plurality of recesses. Furthermore, the heating device according to the present disclosure includes a first insulating member. The first insulating member faces the third surface and surrounds the metal plate.

FIG. 1 is a cross-sectional view showing an example of a heating device. FIG. 2 is a cross-sectional view showing another example of the heating device. FIG. 3 is an enlarged cross-sectional view of the heating device shown in FIG. 2 taken along line A-A'. FIG. 4 is a cross-sectional view showing another example of the heating device. FIG. 5 is a cross-sectional view showing another example of the heating device. FIG. 6 is a cross-sectional view showing another example of the heating device. FIG. 7 is a cross-sectional view showing another example of the heating device. FIG. 8 is a cross-sectional view showing another example of the heating device.

In recent years, there has been a demand to improve the thermal uniformity of heating devices.

The heating device 100 is described in detail.

1 is a cross-sectional view showing an example of a heating device 100. As shown in Fig. 1, the heating device 100 includes a metal plate 1 having a first main surface (an example of a first surface) that is a heating surface 11 and a second main surface (an example of a second surface) having a plurality of recesses 12, a plurality of heaters 2 positioned in the plurality of recesses 12, and a first insulating member 3 positioned to the side of the metal plate 1.

The metal plate 1 is a member for supporting a mold. The metal plate 1 may be a plate-shaped or cylindrical member having a first main surface and a second main surface. The metal plate 1 shown in FIG. 1 is a plate-shaped member.

The metal plate 1 has a metal material. The metal plate 1 has a metal material such as a metal mainly made of iron, such as SUS (stainless steel), KOVAR, or Invar, a metal mainly made of nickel, such as Inconel, or a metal material such as Ti (titanium), copper, brass, or a chromium alloy. When the metal plate 1 is in the form of a plate, the dimensions of the metal plate 1 can be, for example, a length of 10 to 500 mm and a thickness of 1 to 100 mm.

The first main surface of the metal plate 1 is the heating surface 11. The heating surface 11 of the metal plate 1 is located on the upper surface that can come into contact with the mold. The second main surface of the metal plate 1 may be located, for example, on the opposite side to the first main surface. When the first main surface of the metal plate 1 is located, for example, on the upper surface, the second main surface of the metal plate 1 may be located on the lower surface. The second main surface of the metal plate 1 has a plurality of recesses 12. The plurality of recesses 12 may have, for example, a bottom surface and a side surface. The bottom surface of the recesses 12 may be, for example, circular or rectangular. The depth of the recesses 12 may be 0.5 mm to 90 mm. In addition, the width of the recesses 12 may be 0.5 to 100 mm in diameter when the bottom surface is circular. In addition, the shape of the bottom surface of the plurality of recesses 12 may be, for example, the same. In addition, the shapes of the bottom surfaces of the plurality of recesses 12 may be different from each other. In addition, the depths of the plurality of recesses 12 may be different from each other.

In addition, the term "upper surface" in this specification means the surface on which the heating surface 11 is located when viewed from the heater 2. The term "lower surface" means the surface on which the heater 2 is located when viewed from the heating surface 11. However, the terms "upper surface" and "lower surface" in this specification are used to make it easier to understand the positional relationship, and do not limit the embodiment. For example, it is also possible to carry out the embodiment with the heating device 100 shown in the figure tilted.

In addition, the metal plate 1 may be formed as an integral part, or may be formed separately and fixed by bonding or the like. In other words, the metal plate 1 may be formed by fixing a first part having a plurality of recesses 12 and a second part having a plurality of through holes, which are overlapped and fixed so that the recesses 12 and the through holes are continuous.

The heater 2 is a member for generating heat by the flow of electric current. As shown in FIG. 1, the heater 2 is located in a plurality of recesses 12 on the second main surface. The heating device 100 has a plurality of heaters 2. The plurality of heaters 2 are located in the plurality of recesses 12. The heater 2 may be, for example, a ceramic heater made of a ceramic body having a heating resistor therein. The heater 2 may be a cartridge heater having a heating element and a ceramic material in a metal tube. The shape of the heater 2 may be, for example, a rod shape such as a round bar or a square bar, or a plate shape. When the heater 2 has a heating resistor therein, the heating resistor may have, for example, a folded shape. The heating resistor may also be a pair of linear parts at the rear end side of the folded part. The heating pattern of the heating resistor may be, for example, a pattern in which the folded part is repeatedly folded back and forth between the front end side and the rear end side, rather than a pattern in which the folded part is only on the front end side. The rear end side of the heater 2 is connected to an external power source. The rear end side of the heater 2 may be fixed by a member such as a support.

The heating resistor has a metal material. The metal material has, for example, tungsten, molybdenum, or rhenium. The heating resistor may have an insulating member. This allows the resistance value of the heating resistor to be adjusted. The heating resistor may be arranged so that it generates the most heat on the heating surface 11 of the metal plate 1. The heating resistor may have, for example, a folded portion located in the recess 12.

The ceramic body may have an insulating ceramic material. The ceramic body may have an insulating ceramic material such as alumina, silicon nitride, or aluminum nitride. When the heater 2 is made of a ceramic body, the dimensions of the ceramic body, when the ceramic body is cylindrical, can be, for example, a length of 1 to 200 mm and an outer diameter of 0.5 to 100 mm. When the ceramic body is cylindrical, the dimensions of the ceramic body, can be, for example, a length of 1 to 200 mm, an outer diameter of 0.5 to 100 mm, and an inner diameter of 0.2 to 90 mm.

In the heating device 100 of the present disclosure, the second main surface of the metal plate 1 has multiple recesses 12, and multiple heaters 2 are located in each of the multiple recesses 12. This makes it possible to reduce temperature variation on the heating surface 11 compared to the case where the heaters 2 are inserted in a direction parallel to the heating plate as in the heating device 100 described in Patent Document 1. As a result, the thermal uniformity of the heating device 100 can be improved.

The first insulating member 3 is a member for preventing the heat generated by the heater 2 from being transmitted to the outside. The first insulating member 3 is located on the side of the metal plate 1. In other words, the first insulating member 3 faces the side of the metal plate 1 and surrounds the metal plate 1. The side of the metal plate 1 is an example of a third surface connected to each of the first and second surfaces of the metal plate 1. The first insulating member 3 may have, for example, ceramic, glass, or metal. It is preferable that the first insulating member 3 has a lower thermal conductivity than the metal plate 1. The first insulating member 3 may have a ceramic material such as aluminum oxide, silicon nitride, or aluminum nitride. The first insulating member 3 is preferably a fibrous ceramic member having gaps inside, such as porous or cotton. This makes it difficult for the member to be distorted by external temperature changes. As a result, durability can be improved. The first insulating member 3 may have a gap between the metal plate 1 and the first insulating member 3, for example, when the heating device 100 is viewed from a direction perpendicular to the heating surface 11 of the metal plate 1. In addition, the first heat insulating member 3 may be fixed to the metal plate 1 by another member such as a bonding material.

The shape of the first insulating member 3 may be, for example, plate-like, annular, or film-like. In addition, when the metal plate 1 is, for example, a plate-like main surface having a square shape, the first insulating member 3 may cover the side of the metal plate 1. This can further reduce the risk of heat escaping from the metal plate 1. In addition, the first insulating member 3 may cover all four side surfaces (an example of the third surface) of the metal plate 1. This can further reduce the risk of heat escaping from the metal plate 1. In addition, the first insulating member 3 may be a plurality of members formed into a plate shape, and may have an annular structure as a whole by covering the entire side surface of the metal plate 1.

In the heating device 100 of the present disclosure, the first insulating member 3 is located on the side of the metal plate 1. As a result, the heater 2 is located in a recess 12 on the inner circumference of the metal plate 1, so that the heat of the heater 2 can be transferred to the heating surface 11 while the first insulating member 3 can suppress heat escaping from the side of the metal plate 1. This reduces the risk of temperature variation occurring between the center and side of the heating surface 11 of the metal plate 1. As a result, the thermal uniformity of the heating surface 11 of the metal plate 1 can be improved.

2, a frame member 4 may be provided that is located to the side of the first insulating member 3 and covers the first insulating member 3. This reduces the area of the first insulating member 3 that is exposed. This reduces the risk of the first insulating member 3 deteriorating over time due to long-term use.

The frame member 4 is a member for protecting the first insulating member 3. As shown in FIG. 3, the frame member 4 is located on the side of the first insulating member 3. The frame member 4 is located so as to cover the first insulating member 3. The frame member 4 may have, for example, ceramic, glass, or metal. The shape of the frame member 4 may be, for example, a plate-like, cylindrical, or rectangular tube-like shape. For example, when the main surface of the metal plate 1 is rectangular and the first insulating member 3 covers the side of the metal plate 1, the frame member 4 may cover the side of the first insulating member 3. The dimensions of the frame member 4, for example, when the frame member 4 is plate-like, can be 10 to 500 mm in width and 0.3 to 20 mm in thickness.

3, it is preferable that the recesses 12 are evenly positioned along the length of the second main surface of the metal plate 1. The number of recesses may be greater than the number shown in FIG.

4, the heating device 100 may have a first fixing member 5 that penetrates the frame member 4 and the first insulating member 3 and fixes the frame member 4 and the metal plate 1. This allows stress caused by external forces such as vibration to be distributed to the area where the frame member 4, the first insulating member 3, and the metal plate 1 contact each other. As a result, the risk of cracks occurring at the area where the first insulating member 3 and the metal plate 1 contact each other can be reduced.

The first fixing member 5 is a member for fixing the frame member 4 and the first insulating member 3 to the metal plate 1. The shape of the first fixing member 5 may be, for example, a rod-like or cylindrical shape having a longitudinal direction. The first fixing member 5 may have, for example, a screw-like portion, and the metal plate 1, the first fixing member 5, and the first insulating member 3 may have a screw hole. The frame member 4 and the first insulating member 3 may be fixed to the metal plate 1 by inserting the screw-like portion of the first fixing member 5 into the screw hole. The first fixing member 5 may have, for example, ceramic, glass, metal, etc. In particular, metals mainly made of iron such as heat-resistant SUS (stainless steel), KOVAR (kovar), and Invar, metals mainly made of nickel such as Inconel, or metal materials such as Ti (titanium), copper, brass, and chromium alloys are preferable. The first fixing member 5 may also be fixed to the frame member 4 and the first insulating member 3 by a bonding material such as a brazing material. Furthermore, the first fixing member 5 may be fixed to the frame member 4 and the first insulating member 3, for example, by crimping. When the first fixing member 5 is rod-shaped having a longitudinal direction, the length can be set to, for example, 3 to 100 mm and the outer diameter can be set to 1 to 10 mm.

4, the first fixing member 5 may be inserted perpendicularly to the side of the metal plate 1. This allows the first fixing member 5 to be inserted in the direction in which the metal plate 1 thermally expands, dispersing the stress generated between the first fixing member 5 and the metal plate 1.

As shown in Fig. 5, the heating device 100 may also have a spacer 6 located between the frame member 4 and the metal plate 1. The spacer 6 may be located, for example, between the first insulating member 3 and the metal plate 1. This allows the frame member 4 and the metal plate 1 to be fixed with a predetermined gap between them. This reduces the risk of deterioration of thermal uniformity due to misalignment of the gap between the frame member 4 and the metal plate 1.

The shape of the spacer 6 is, for example, plate-like, rod-like, or annular. The spacer 6 may be located so as to surround at least a part of the outer periphery of the first fixing member 5 when the first fixing member 5 is a member having a longitudinal direction. The spacer 6 may have a metal material, ceramic, or glass. The metal material may be, for example, a metal mainly made of iron such as SUS (stainless steel), KOVAR, or Invar, a metal mainly made of nickel such as Inconel, or a metal material such as titanium, copper, brass, or a chromium alloy. When the spacer 6 is annular so as to surround the outer periphery of the first fixing member 5, the outer diameter can be 2 to 20 mm, the inner diameter can be 1 to 10 mm, and the thickness can be 0.5 to 5 mm.

The spacer 6 may be an annular member, and the inner peripheral surface of the spacer 6 may be in contact with the outer peripheral surface of the first fixing member 5. This prevents the first fixing member 5 from moving in a direction perpendicular to the longitudinal direction. As a result, the durability of the heating device 100 can be improved.

Also, as shown in Figure 6, the heating surface 11 may be located above the first insulating member 3. This allows the metal plate 1 to be positioned between the first insulating member 3 and the mold. This reduces the risk of the first insulating member 3 and the mold deteriorating due to the first insulating member 3 coming into direct contact with the mold when the mold is heated. As a result, the reliability of the heating device 100 can be improved.

As an example of the heating surface 11 being located above the first insulating member 3, for example, when viewing a cross section perpendicular to the heating surface 11 as shown in FIG. 6, the upper end (an example of an end) of the first insulating member 3 may be located below the heating surface 11. Also, the area of the second main surface of the metal plate 1 may be smaller than the area of the heating surface 11, and the first insulating member 3 may be located in a position surrounding the second main surface. Also, the metal plate 1 may have a recess 12 or a countersink on the side, and the first insulating member 3 may be located in the recess 12 or the countersink. Also, the metal plate 1 may have a first portion and a second portion each having a plate shape, and the lower surface of the first portion may be in contact with the entire upper surface of the second portion, and the first insulating member 3 may be located in the space between the lower surface of the first portion and the side surface of the second portion. At this time, the first insulating member 3 may be in contact with the lower surface of the first portion and the side surface of the second portion, respectively, or may be located with a gap from the lower surface of the first portion.

In addition, "above" in this specification means the direction in which the heating surface 11 is located as viewed from the heater 2. In this specification, "above" may also mean straight above. "Below" means the direction in which the heater 2 is located as viewed from the heating surface 11. "Side" means a direction parallel to the heating surface 11, going from the inside to the outside of the heating device 100. However, the terms "above," "below," and "side" in this specification are used to make it easier to understand the positional relationship, and do not limit the embodiment. For example, it is also possible to carry out the invention with the heating device 100 shown in the figure tilted.

6, the upper end (an example of an end portion) of the frame member 4 may be located higher than the upper end of the first insulating member 3. Here, "upper end" refers to the uppermost portion of the first insulating member 3.

Also, as shown in Figure 7, the heating surface 11 may extend further outward than the frame member 4 and be located above the frame member 4. This allows the metal plate 1 to be positioned between the frame member 4 and the mold. This reduces the risk of the frame member 4 coming into direct contact with the mold when heating the mold, causing heat from the mold to escape to the frame member 4. As a result, the reliability of the heating device 100 can be improved.

7, the heating device 100 may further include a second insulating member 7 in contact with the second main surface. This reduces the risk that the heat of the heater 2 will be released below the metal plate 1. As a result, the efficiency of heating can be improved.

The second insulating member 7 is a member for preventing the heat generated by the heater 2 from being transmitted to the outside. The second insulating member 7 is in contact with the second main surface of the metal plate 1. The second insulating member 7 may have, for example, ceramic, glass, or metal. In addition, the second insulating member 7 is preferably a fibrous ceramic member having gaps inside, such as porous or cotton. This makes it difficult for the member to be distorted by external temperature changes. As a result, durability can be improved. In addition, the second insulating member 7 may have a gap between the metal plate 1 and the second insulating member 7 when the heating device 100 is viewed from a direction perpendicular to the heating surface 11 of the metal plate 1.

The shape of the second insulating member 7 may be, for example, plate-like. The dimensions of the second insulating member 7, when it is a plate-like member, may be, for example, 10 to 500 mm in width and 0.3 to 20 mm in thickness.

Also, as shown in FIG. 8, the heating device 100 may have a support plate 8 that is plate-shaped and in contact with the second insulating member 7.

The support plate 8 is a member for fixing the second insulating member 7. The support plate 8 has a metal material. The shape of the support plate 8 may be, for example, a rectangular plate or a circular plate. The support plate 8 may have, for example, ceramic, glass, or metal. When the support plate 8 is plate-shaped, the dimensions of the support plate 8 can be a vertical length of 10 to 500 mm, a horizontal length of 10 to 500 mm, and a thickness of 0.3 to 30 mm.

As shown in FIG. 8, the heating device 100 may also have a second fixing member 9 that fixes the frame member 4 and the support plate 8. This allows the frame member 4 and the support plate 8 to be firmly fixed. This allows the stress that occurs in the area where the frame member 4 and the support plate 8 come into contact due to external forces such as vibration to be dispersed. As a result, the risk of cracks occurring in the area where the frame member 4 and the support plate 8 come into contact can be reduced. As a result, durability can be improved.

The second fixing member 9 is a member for fixing the frame member 4 and the support plate 8. The shape of the second fixing member 9 may be, for example, a rod-like or cylindrical shape having a longitudinal direction. The second fixing member 9 may have, for example, a screw-like portion, and the frame member 4 and the support plate 8 may have screw holes, and the screw-like portion of the second fixing member 9 may be inserted into the screw holes to fix the frame member 4 and the support plate 8. The second fixing member 9 may have, for example, ceramic, glass, metal, etc. Also, the second fixing member 9 may be fixed to the frame member 4 and the support plate 8 by a joining material such as a brazing material. Also, the second fixing member 9 may be fixed to the frame member 4 and the support plate 8 by crimping, for example. When the second fixing member 9 is rod-like having a longitudinal direction, it may have, for example, a length of 3 to 100 mm and an outer diameter of 1 to 10 mm.

Also, as shown in Figure 8, the first insulating member 3 and the second insulating member 7 may be in contact with each other. This allows the first insulating member 3 and the second insulating member 7 to be continuously connected. This reduces the risk of heat from the metal plate 1 being transferred to the support plate 8. As a result, the reliability of the heating device 100 can be improved.

Also, as shown in Figure 8, the support plate 8 may be in contact with the frame member 4. This makes it easier to transfer heat from the support plate 8 to the outside of the heating device 100 via the frame member 4 at the area where the support plate 8 and the frame member 4 are in contact. This makes it possible to increase the heating efficiency while improving heat dissipation throughout the heating device 100 as a whole. As a result, the durability of the heating device 100 can be improved.

8, the lower end of the first insulating member 3 may be located above the support plate 8. This reduces the risk that heat from the metal plate 1 will escape below the support plate 8 via the first insulating member 3. As a result, the thermal uniformity of the heating device 100 can be improved.

1: Metal plate 11: Heating surface 12: Recess 2: Heater 3: First heat insulating member 4: Frame member 5: First fixing member 6: Spacer 7: Second heat insulating member 8: Support plate 9: Second fixing member 100: Heating device

Claims (8)

A metal plate;
a plurality of heaters;
The metal plate has a first surface which is a heating surface, a second surface located opposite the first surface and having a plurality of recesses, and a third surface which is connected to both the first surface and the second surface,
the heaters are located in the recesses,
Further, a first heat insulating member is provided,
the first heat insulating member faces the third surface and surrounds the metal plate ;
moreover,
A frame member located on a side of the first heat insulating member and covering the first heat insulating member;
a first fixing member penetrating the frame member and the first heat insulating member and fixing the frame member and the metal plate;
a spacer positioned between the frame member and the metal plate;
The spacer surrounds at least a portion of the first fixing member . The heating device according to claim 1 , wherein an end of the frame member is located higher than an end of the first insulating member. A metal plate;
a plurality of heaters;
The metal plate has a first surface which is a heating surface, a second surface located opposite the first surface and having a plurality of recesses, and a third surface which is connected to both the first surface and the second surface,
the heaters are located in the recesses,
Further, a first heat insulating member is provided,
the first heat insulating member faces the third surface and surrounds the metal plate;
moreover,
a frame member located on a side of the first heat insulating member and covering the first heat insulating member;
At least a portion of the heating surface is located directly above the frame member. A metal plate;
a plurality of heaters;
The metal plate has a first surface which is a heating surface, a second surface located opposite the first surface and having a plurality of recesses, and a third surface which is connected to both the first surface and the second surface,
the heaters are located in the recesses,
Further, a first heat insulating member is provided,
the first heat insulating member faces the third surface and surrounds the metal plate;
A heating device, wherein the first surface is located above an end of the first insulating member. The heating device according to claim 1, further comprising a second insulating member in contact with the second surface of the metal plate. The heating device according to claim 5 , further comprising a support plate having a plate shape and in contact with the second insulating member. The heating device according to claim 5 , wherein the first heat insulating member and the second heat insulating member are in contact with each other. A frame member located on a side of the first heat insulating member and covering the first heat insulating member;
A support plate having a plate shape and in contact with the second insulating member,
The heating device according to claim 6 or 7 , wherein the support plate is in contact with the frame member.

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