Heating jacket

Abstract

The utility model discloses a heating jacket which comprises the following components: a glass jacket body which comprises an inner glass tube and an outer glass tube, the inner side of the inner glass tube is provided with a heating hole, two ends of the inner glass tube and two ends of the outer glass tube are respectively welded and sealed to form the glass jacket body, and a sealed space is arranged between the inner glass tube and the outer glass tube; the heating element is arranged in the sealed space; one end of the pin is electrically connected with the heating piece, the other end of the pin extends to the outer side of the glass sleeve body, and the inner glass tube and the outer glass tube are attached to and connected with the pin in an airtight mode so as to seal the sealed space. The inner glass tube and the outer glass tube are attached to and connected with the pins in an airtight mode, so that no gap exists between the inner glass tube and the pins and between the outer glass tube and the pins, the heating piece is arranged in the sealed space, external air cannot enter the sealed space to make contact with the heating piece, the heating piece is not prone to oxidation in the sealed space, and the service life of the heating sleeve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of heating devices, in particular to a heating sleeve. Background Art

[0002] The heating jacket has an inner hole for a strip of material to pass through, allowing it to heat the object from the outside. A typical heating jacket consists of an inner glass tube, an outer glass tube, and a heating element. The heating element is connected to a pin extending to the outside of the jacket for electrical connection. During production, the heating element is placed between the inner and outer glass tubes. The ends of the inner and outer glass tubes are then heated to fuse them together. The heating element is then fixed in the space between the inner and outer glass tubes, with the pin extending from one end between the inner and outer glass tubes to the outside.

[0003] However, in existing heating sleeves, the heating element is connected to the outside air, and there is a gap between the pins and the inner and outer glass tubes. Air can enter through this gap and come into contact with the heating element. Since the heating element encounters oxygen during heating, it will oxidize at high temperatures, which will greatly reduce the service life of the heating element. Although the distance between the inner and outer glass tubes is currently minimized to minimize air ingress, so as to keep the heating element as close as possible to reduce contact with air, there is still a position on the heating element that can come into contact with air. Moreover, when the outer glass tube is close to the heating element, the heat generated on the outside of the heating element is more easily transferred to the outer glass tube, resulting in a relatively large amount of heat loss from the outer glass tube, increasing energy consumption.

[0004] Therefore, those skilled in the art hope to have a heating sleeve that can solve the problem that the heating element is easily oxidized due to being connected to the outside air, thereby reducing the service life, and extend the service life of the heating sleeve. Utility Model Content

[0005] The main purpose of the utility model is to provide a heating sleeve, aiming to solve the technical problem in the prior art that the heating element of the heating sleeve is easily oxidized due to communication with the outside air, thereby reducing the service life.

[0006] To achieve the above objectives, the present invention provides a heating jacket, comprising:

[0007] A glass casing, comprising an inner glass tube and an outer glass tube, wherein the outer glass tube is spaced apart and sleeved on the outer side of the inner glass tube, and the inner side of the inner glass tube is provided with a heating hole for passing an object to be heated. The ends of the inner glass tube and the ends of the outer glass tube are respectively fused and sealed to form the glass casing, and a sealed space is provided between the inner glass tube and the outer glass tube;

[0008] a heating element, the heating element being arranged in the sealed space;

[0009] A pin, one end of the pin is electrically connected with the heat generating element, and the other end of the pin extends to the outside of the glass sleeve, and the inner glass tube and the outer glass tube are hermetically connected with the pin to enclose the sealed space.

[0010] In the heating sleeve, the inner glass tube and the outer glass tube are hermetically connected with the pin, so that there is no gap between the inner glass tube, the outer glass tube and the pin, the heat generating element is in the closed sealed space, and external air cannot enter the sealed space to contact the heat generating element, so that the heat generating element is not easy to oxidize in the sealed space, and the service life of the heating sleeve is prolonged.

[0011] Preferably, the material of the inner glass tube and the outer glass tube is quartz glass, the pin includes a molybdenum sheet, and the inner glass tube and the outer glass tube are attached to the molybdenum sheet to achieve airtight connection.

[0012] The material of the inner glass tube and the outer glass tube is quartz glass, the pin includes a molybdenum sheet, and the inner glass tube and the outer glass tube are attached to the molybdenum sheet to achieve airtight connection.

[0013] Preferably, the pin is the molybdenum sheet as a whole. The inner glass tube and the outer glass tube can be attached to the molybdenum sheet, and the pin structure is simple.

[0014] Preferably, the pin further includes a first molybdenum rod and a second molybdenum rod, the molybdenum sheet is arranged between the first molybdenum rod and the second molybdenum rod, the first molybdenum rod is arranged in the sealed space, one end of the first molybdenum rod is electrically connected with the heat generating element, the other end of the first molybdenum rod is electrically connected with the molybdenum sheet, one end of the second molybdenum rod is electrically connected with the molybdenum sheet, and the other end of the second molybdenum rod extends to the outside of the glass sleeve.

[0015] The first molybdenum rod is connected with the heating element, the second molybdenum rod extends to the outside of the heating jacket and is used for connecting with the external power supply, the molybdenum sheet is connected between the first molybdenum rod and the second molybdenum rod, the inner glass tube and the outer glass tube can be attached to the molybdenum sheet at the position of the molybdenum sheet to realize the airtight connection, meanwhile, the first molybdenum rod is easy to be connected with the heating element, and the second molybdenum rod has high structural strength and is connected with the external power supply.

[0016] Preferably, the material of the inner glass tube and the outer glass tube is tungsten hard material glass, and the pin is a tungsten rod.

[0017] The inner glass tube and the outer glass tube made of tungsten hard material glass have similar expansion coefficients with the tungsten rod, so that the inner glass tube and the outer glass tube can adapt to the expansion of the tungsten rod after being heated and keep attached to the tungsten rod without being squeezed and broken to form a gap, so that the inner glass tube and the outer glass tube can keep close to the tungsten rod and keep the sealed space closed.

[0018] Preferably, the material of the inner glass tube and the outer glass tube is molybdenum glass, and the pin is a molybdenum rod.

[0019] The inner glass tube and the outer glass tube made of molybdenum glass have similar expansion coefficients with the molybdenum rod, so that the inner glass tube and the outer glass tube can adapt to the expansion of the molybdenum rod after being heated and keep attached to the molybdenum rod without being squeezed and broken to form a gap, so that the inner glass tube and the outer glass tube can keep close to the molybdenum rod and keep the sealed space closed.

[0020] Preferably, the material of the inner glass tube and the outer glass tube is soft material glass, and the pin is a Dumet wire.

[0021] The inner glass tube and the outer glass tube made of soft material glass can withstand the expansion of the Dumet wire after being heated without being squeezed and broken to form a gap, so that the inner glass tube and the outer glass tube can keep close to the Dumet wire and keep the sealed space closed.

[0022] Preferably, the thickness of the molybdenum sheet is 0.015-0.035mm. The molybdenum sheet has small expansion after being heated in this thickness range, and can be better attached to the inner glass tube and the outer glass tube.

[0023] Preferably, the distance between the outer diameter of the inner glass tube and the inner diameter of the outer glass tube is 0.5-2.5mm.

[0024] Preferably, the outer side of the outer glass tube is provided with a heat reflecting film, which can reflect the heat emitted by the heating element to the inner side of the glass sleeve, reduce the heat loss to the outside, and be more energy-saving.

[0025] Preferably, the heating element is a heating wire mesh or a heating sheet.

[0026] Preferably, the sealed space is in a vacuum or filled with inert gas, which can further protect the heating element from oxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the heating jacket of the present invention;

[0029] Figure 2 This is a schematic cross-sectional view of the first embodiment of the heating jacket of the present invention;

[0030] Figure 3 This is a schematic diagram of the exploded structure of the first embodiment of the heating jacket of the present invention;

[0031] Figure 4 This is a schematic diagram of the overall structure of the second embodiment of the heating jacket of the present invention;

[0032] Figure 5 This is a schematic cross-sectional view of a second embodiment of the heating jacket of the present invention;

[0033] Figure 6 This is a schematic diagram of the exploded structure of the second embodiment of the heating jacket of the present invention.

[0034] In the accompanying drawings: 1-glass casing, 11-inner glass tube, 12-outer glass tube, 13-heating hole, 14-sealed space, 2-heating element, 3-pin, 31-molybdenum sheet, 32-first molybdenum rod, 33-second molybdenum rod.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the utility model have directionality indication, such as up, down, left, right, front, back, etc., the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, if the certain posture changes, the directionality indication also changes accordingly.

[0038] In addition, if the embodiments of the utility model have descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the utility model.

[0039] As shown in Figures 1 to 6 A heating sleeve, comprising a glass sleeve body 1, a heating element 2 and a pin 3.

[0040] The glass sleeve body 1 comprises an inner glass tube 11 and an outer glass tube 12, the outer glass tube 12 is sleeved on the outer side of the inner glass tube 11, the inner side of the inner glass tube 11 is provided with a heating hole 13 for passing the object to be heated, the object to be heated can be a solid such as a strip-shaped object, or a liquid or a gas, etc. The two ends of the inner glass tube 11 and the two ends of the outer glass tube 12 are respectively fused and sealed to form the glass sleeve body 1, and a sealed space 14 is arranged between the inner glass tube 11 and the outer glass tube 12. More preferably, the sealed space 14 is vacuum or filled with inert gas, which can further protect the heating element 2 from oxidation.

[0041] The heating element 2 is arranged in the sealed space 14, and the heating element 2 is a heating wire mesh or a heating sheet.

[0042] One end of the pin 3 is electrically connected with the heating element 2, and the other end of the pin 3 extends to the outer side of the glass sleeve body 1, and the pin 3 has a length before extending out of the glass sleeve body 1, which needs to be attached to the inner glass tube 11 and the outer glass tube 12, and the inner glass tube 11 and the outer glass tube 12 are attached to the pin 3 in airtight connection to close the sealed space 14. The number of pins 3 can be two, and the two pins 3 are respectively connected to the two sides of the heating element 2, and the two pins 3 are connected to the heating element 2 after being electrified.

[0043] The utility model discloses a heating jacket, and the inner glass tube 11 and the outer glass tube 12 are air-tightly connected with the pin 3, so that there is no gap between the inner glass tube 11, the outer glass tube 12 and the pin 3, the heating element 2 is in the closed sealing space 14, and external air cannot enter the sealing space 14 and contact the heating element 2, so that the heating element 2 is not easy to oxidize in the sealing space 14, and the service life of the heating jacket is prolonged.

[0044] In the prior art, the sealing performance of the inner glass tube and the outer glass tube wrapped around the outer side of the pin is not good enough. Since the expansion coefficients of the pin and the glass are quite different, when working, the pin and the glass of the inner glass tube and the outer glass tube are expanded to different degrees by heat, a gap is formed between the pin and the inner glass tube and the outer glass tube, and the inner glass tube and the outer glass tube cannot be sealed with the pin. In a serious case, the part of the inner glass tube and the outer glass tube wrapped around the pin can be crushed by the pin, and a gap is formed around the pin. In this way, the inner glass tube and the outer glass tube cannot be sealed with the pin, and air can easily enter the gap and contact the heating element, thereby reducing the service life of the heating element.

[0045] The utility model discloses a heating jacket, and the inner glass tube 11 and the outer glass tube 12 are air-tightly connected with the pin 3, so that there is no gap between the inner glass tube 11, the outer glass tube 12 and the pin 3, the heating element 2 is in the closed sealing space 14, and external air cannot enter the sealing space 14 and contact the heating element 2, so that the heating element 2 is not easy to oxidize in the sealing space 14, and the service life of the heating jacket is prolonged.

[0046] In some specific embodiments, the materials of the inner glass tube 11 and the outer glass tube 12 are quartz glass, and the pin 3 includes a molybdenum sheet 31. The inner glass tube 11 and the outer glass tube 12 are air-tightly connected with the molybdenum sheet 31.

[0047] In the prior art, the inner glass tube and the outer glass tube made of quartz glass are combined with a molybdenum rod pin. The diameter of the molybdenum rod is 0.5-1mm. Since the molybdenum rod is expanded by a large amount of heat, the inner glass tube and the outer glass tube cannot withstand the expansion of the molybdenum rod, and a gap is formed between the molybdenum rod.

[0048] In the embodiment, the inner glass tube 11 and the outer glass tube 12 are both made of quartz glass, the pin 3 includes a molybdenum sheet 31, and the inner glass tube 11 and the outer glass tube 12 are sealed to the pin 3 at the position of the molybdenum sheet 31 to close the sealed space 14. Since the thickness of the molybdenum sheet 31 is relatively thin compared with the diameter of the molybdenum rod, the expansion amount of the molybdenum sheet 31 is relatively small when heated, and the inner glass tube 11 and the outer glass tube 12 made of quartz glass can withstand the expansion amount of the molybdenum sheet 31 without being crushed to form a gap. The inner glass tube 11 and the outer glass tube 12 can be kept close to the molybdenum sheet 31, the sealed space 14 is kept closed, and air cannot enter the sealed space 14 through the pin 3 to contact the heating element 2.

[0049] The structure of the pin 3 can adopt the following embodiment one or embodiment two, or other structures including the molybdenum sheet 31.

[0050] Embodiment one, refer to Figures 1 to 3 The pin 3 is a whole molybdenum sheet 31. The pin 3 is provided as a whole molybdenum sheet 31, one end of the molybdenum sheet 31 is in the sealed space 14, and the other end of the molybdenum sheet 31 extends to the outside of the glass sleeve 1. The end of the inner glass tube 11 and the outer glass tube 12 can be close to the molybdenum sheet 31, and the structure of the pin 3 is simple. Preferably, a molybdenum rod can be provided between the molybdenum sheet 31 and the heating element 2 as a transition for convenient welding.

[0051] Embodiment two, refer to Figures 4 to 5 The pin 3 further includes a first molybdenum rod 32 and a second molybdenum rod 33, the molybdenum sheet 31 is arranged between the first molybdenum rod 32 and the second molybdenum rod 33, the first molybdenum rod 32 is arranged in the sealed space 14, one end of the first molybdenum rod 32 is electrically connected to the heating element 2, the other end of the first molybdenum rod 32 is electrically connected to the molybdenum sheet 31, one end of the second molybdenum rod 33 is electrically connected to the molybdenum sheet 31, and the other end of the second molybdenum rod 33 extends to the outside of the glass sleeve 1. The connection position of the first molybdenum rod 32 and the molybdenum sheet 31 is arranged separately from the connection position of the second molybdenum rod 33 and the molybdenum sheet 31.

[0052] The first molybdenum rod 32 is connected to the heating element 2, the second molybdenum rod 33 extends to the outside of the heating sleeve for external power connection, the molybdenum sheet 31 is connected between the first molybdenum rod 32 and the second molybdenum rod 33, and the end of the inner glass tube 11 and the outer glass tube 12 can be close to the molybdenum sheet 31 at the position of the molybdenum sheet 31 to achieve sealing. At the same time, the first molybdenum rod 32 is easy to connect to the heating element 2, and the second molybdenum rod 33 has high strength for external power connection. The connection position of the first molybdenum rod 32 and the molybdenum sheet 31 is arranged separately from the connection position of the second molybdenum rod 33 and the molybdenum sheet 31, which is to leave a position for the molybdenum sheet 31 to be close to the inner glass tube 11 and the outer glass tube 12. The form of separate arrangement can be along the axial direction of the glass sleeve 1, refer to Figure 5 and Figure 6 It can also be arranged along the circumferential direction of the glass sleeve 1, etc.

[0053] The material of the inner glass tube 11 and the outer glass tube 12 and the pin 3 can also be matched with the following embodiments.

[0054] Embodiment three:

[0055] The material of the inner glass tube 11 and the outer glass tube 12 is tungsten group hard material glass, and the pin 3 is a tungsten rod.

[0056] The tungsten group hard material glass is a current glass material. The inner glass tube 11 and the outer glass tube 12 made of the tungsten group hard material glass have a similar expansion coefficient with the tungsten rod. The inner glass tube 11 and the outer glass tube 12 can adapt to the expansion amount of the tungsten rod after being heated to keep close to the tungsten rod, and will not be squeezed to form a gap. In this way, the inner glass tube 11 and the outer glass tube 12 can keep close to the tungsten rod, so that the sealed space 14 is kept closed.

[0057] Embodiment four:

[0058] The material of the inner glass tube 11 and the outer glass tube 12 is molybdenum group glass, and the pin 3 is a molybdenum rod.

[0059] The molybdenum group glass is a current glass material. The inner glass tube 11 and the outer glass tube 12 made of the molybdenum group glass have a similar expansion coefficient with the molybdenum rod. The inner glass tube 11 and the outer glass tube 12 can adapt to the expansion amount of the molybdenum rod after being heated to keep close to the molybdenum rod, and will not be squeezed to form a gap. In this way, the inner glass tube 11 and the outer glass tube 12 can keep close to the molybdenum rod, so that the sealed space 14 is kept closed.

[0060] Embodiment five:

[0061] The material of the inner glass tube 11 and the outer glass tube 12 is soft material glass, and the pin 3 is a Dumet wire.

[0062] The soft material glass is a current glass material. The inner glass tube 11 and the outer glass tube 12 made of the soft material glass can adapt to the expansion amount of the Dumet wire after being heated to keep close to the Dumet wire, and will not be squeezed to form a gap. In this way, the inner glass tube 11 and the outer glass tube 12 can keep close to the Dumet wire, so that the sealed space 14 is kept closed.

[0063] In some specific embodiments, the thickness of the molybdenum sheet 31 is 0.015-0.035 mm. The molybdenum sheet 31 has a small expansion amount after being heated in this thickness range, and can be better combined with the inner glass tube 11 and the outer glass tube 12.

[0064] In some specific embodiments, the interval between the outer diameter of the inner glass tube 11 and the inner diameter of the outer glass tube 12 is 0.5-2.5 mm. In this interval range, the outer glass tube 12 has a good heat insulation effect on the heating element 2, and the outer diameter of the glass sleeve 1 will not be too large.

[0065] In some specific embodiments, the outer glass tube 12 is provided with a heat reflecting film on the outer side, which can reflect the heat emitted by the heating element 2 to the inner side of the glass sleeve 1, reduce the heat loss to the outside, and save energy.

[0066] In the existing heating sleeve, the outer glass tube is close to the heating element, and the outer glass tube is deformed to be closer to the heating element during manufacturing, so that the surface of the outer glass tube of the existing heating sleeve is uneven, and it is difficult to paste the heat reflecting film. In the utility model, the outer glass tube 12 does not need to be deformed to be close to the heating element 2, so that the surface of the outer glass tube 12 is relatively flat, and it is relatively easy to paste the heat reflecting film, and the heat loss can be further reduced.

[0067] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields under the inventive concept of the utility model, and the contents of the utility model specification and drawings are included in the patent protection range of the utility model.

Claims

1. A heating jacket characterized in that, include: A glass casing (1), the glass casing (1) comprising an inner glass tube (11) and an outer glass tube (12), the outer glass tube (12) being spaced apart and sleeved on the outer side of the inner glass tube (11), the inner side of the inner glass tube (11) being provided with a heating hole (13) for allowing an object to be heated to pass through, the two ends of the inner glass tube (11) and the two ends of the outer glass tube (12) being respectively fused and sealed to form the glass casing (1), and a sealed space (14) being provided between the inner glass tube (11) and the outer glass tube (12); A heating element (2), the heating element (2) being arranged in the sealed space (14); A pin (3), one end of the pin (3) is electrically connected to the heating element (2), the other end of the pin (3) extends to the outside of the glass sleeve (1), and the inner glass tube (11) and the outer glass tube (12) are fitted and airtightly connected to the pin (3) to seal the sealed space (14).

2. The heating mantle as claimed in claim 1, characterized in that The inner glass tube (11) and the outer glass tube (12) are both made of quartz glass, the pin (3) comprises a molybdenum sheet (31), and the inner glass tube (11) and the outer glass tube (12) are fitted with the molybdenum sheet (31) to achieve an airtight connection.

3. The heating mantle as claimed in claim 2, characterized in that The pin (3) is entirely the molybdenum sheet (31).

4. The heating mantle as claimed in claim 2, characterized in that The pin (3) further includes a first molybdenum rod (32) and a second molybdenum rod (33); the molybdenum sheet (31) is arranged between the first molybdenum rod (32) and the second molybdenum rod (33); the first molybdenum rod (32) is arranged in the sealed space (14); one end of the first molybdenum rod (32) is electrically connected to the heating element (2); the other end of the first molybdenum rod (32) is electrically connected to the molybdenum sheet (31); one end of the second molybdenum rod (33) is electrically connected to the molybdenum sheet (31); the other end of the second molybdenum rod (33) extends to the outside of the glass sleeve (1); the connection position between the first molybdenum rod (32) and the molybdenum sheet (31) and the connection position between the second molybdenum rod (33) and the molybdenum sheet (31) are spaced apart.

5. A heating mantle as claimed in any one of claims 2 to 4, characterized in that The thickness of the molybdenum sheet (31) is 0.015-0.035 mm.

6. The heating mantle as claimed in claim 1, characterized in that The inner glass tube (11) and the outer glass tube (12) are both made of tungsten hard glass, and the pin (3) is a tungsten rod.

7. The heating mantle as claimed in claim 1, characterized in that The inner glass tube (11) and the outer glass tube (12) are both made of molybdenum glass, and the pin (3) is a molybdenum rod.

8. The heating mantle as claimed in claim 1, characterized in that The inner glass tube (11) and the outer glass tube (12) are both made of soft glass, and the pin (3) is a Dumet wire.

9. The heating mantle as claimed in claim 1, characterized in that The distance between the outer diameter of the inner glass tube (11) and the inner diameter of the outer glass tube (12) is 0.5-2.5 mm.

10. The heating mantle as claimed in claim 1, characterized in that A heat reflection film is provided on the outside of the outer glass tube (12), and the heat reflection film can reflect the heat emitted by the heating element (2) toward the inside of the glass sleeve (1).

Images