Glass tube and metal tube sealing device and sealing method

Abstract

The invention relates to a sealing device and a sealing method for a glass tube and a metal tube, the sealing device comprises a fixing device, a sealing die sleeve and a heating device, the fixing device comprises a first fixing part and a second fixing part, the first fixing part is used for fixing the glass tube, the second fixing part is used for coaxially fixing the metal tube and the glass tube to the metal tube, and the heating device is used for heating the sealing die sleeve. At least one of the first fixing part and the second fixing part is arranged in a translation manner; the sealing die sleeve comprises a die cavity capable of containing the sealing end of the glass tube, the die cavity is provided with an annular forming part, the annular forming part is used for containing and shaping glass, fused and overflowing in the sealing process, of the sealing end of the glass tube, and the sealing die sleeve is static relative to the first fixing part in the sealing process; the heating device comprises at least one heating part, and the at least one heating part is used for heating the sealing end of the metal pipe. According to the sealing device, the sealing effect and the sealing quality consistency of the glass tube and the metal tube can be effectively improved, and the sealing quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal power generation equipment manufacturing, and in particular to a glass tube and metal tube sealing device and a sealing method. Background Art

[0002] Linear solar concentrating technology has been widely used in solar heating, cooling, and power generation. It is a crucial renewable energy technology for transforming China's energy structure and achieving its dual-carbon strategy. High-temperature solar collector tubes are the primary components in this system that convert sunlight into heat. They consist of a metal inner tube with a selective absorption film and a glass outer tube surrounding it. To minimize heat loss, a vacuum space must be created between the glass outer tube and the metal inner tube. Therefore, a hermetic seal is created by heat-melting the glass outer tube to the transition metal tube. Currently, flame sealing is primarily performed on a glass lathe. However, product quality varies greatly, making consistent sealing difficult to achieve. Summary of the Invention

[0003] A first object of the present invention is to provide a glass tube and metal tube sealing device to improve the consistency of the sealing effect between the glass tube and the metal tube.

[0004] The second object of the present invention is to provide a sealing method based on the above-mentioned glass tube and metal tube sealing device.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A glass tube and metal tube sealing device, comprising:

[0007] A fixing device comprising a first fixing portion and a second fixing portion, wherein the first fixing portion is used to fix the glass tube, and the second fixing portion is used to fix the metal tube coaxially with the glass tube, and at least one of the first fixing portion and the second fixing portion is arranged to be translatably arranged so that the first fixing portion and the second fixing portion can move toward and away from each other;

[0008] The sealing mold sleeve includes a mold cavity capable of accommodating the sealed end of the glass tube, the mold cavity having an annular forming portion, the annular forming portion being recessed in a direction away from the axis of the sealing mold sleeve, the annular forming portion being used to accommodate and shape melted glass overflowing from the sealed end of the glass tube during the sealing process, the sealing mold sleeve remaining stationary relative to the first fixing portion during the sealing process;

[0009] The heating device comprises at least one heating portion, and the at least one heating portion is used to heat the sealing end of the metal pipe.

[0010] In one embodiment of the present application, the heating device includes a glass heating part for heating the glass tube and a metal heating part for heating the metal tube. The glass heating part is arranged outside the sealing mold sleeve, and the metal heating part is relatively stationary with the second fixing part during the sealing process.

[0011] In one embodiment of the present application, the glass heating part is a microwave generator.

[0012] In one embodiment of the present application, the metal heating part includes a high-frequency induction coil and a high-frequency electromagnetic generator. The high-frequency induction coil is coaxially arranged with the sealing mold sleeve, and the high-frequency electromagnetic generator is electrically connected to the high-frequency induction coil.

[0013] In one embodiment of the present application, the heating device further includes a heat-insulating cavity, which is coaxially sleeved outside the sealing mold sleeve with the sealing mold sleeve, and the glass heating part is arranged outside the heat-insulating cavity.

[0014] In one embodiment of the present application, one of the insulation cavity and the sealing mold sleeve is provided with an annular cavity for the metal heating part to enter and exit, or an annular cavity for the metal heating part to enter and exit is formed between the insulation cavity and the sealing mold sleeve.

[0015] In one embodiment of the present application, the surface of the annular forming portion is a smooth curved surface.

[0016] In one embodiment of the present application, a sealing bracket is further included, and the fixing device, the sealing mold sleeve and the heating device are respectively arranged on the sealing bracket.

[0017] A sealing method for a glass tube and a metal tube sealing device according to any one of the above-mentioned embodiments comprises the following steps:

[0018] a) Fixing the glass tube and positioning the sealed end of the glass tube in the mold cavity of the sealing mold sleeve of the glass tube and metal tube sealing device;

[0019] b) Fixing the metal tube so that the sealed end of the metal tube and the sealed end of the glass tube are coaxial and in contact with each other;

[0020] c) heating the sealed end of the metal tube to a pre-oxidation temperature for a predetermined time, and after the sealed end of the glass tube softens, moving the glass tube and the metal tube toward each other until the sealed end of the metal tube is inserted into the sealed end of the glass tube by a predetermined distance, so that the sealed end of the glass tube forms an inner and outer clamping seal with the sealed end of the metal tube;

[0021] d) gradually cooling the glass tube until the sealed end is solidified, annealing the sealed body between the glass tube and the metal tube, and completing the sealing of the glass tube and the metal tube.

[0022] In one embodiment of the present application, step c) includes:

[0023] c1) heating the sealed end of the glass tube to a preheating temperature for a first preset time;

[0024] c2) heating the sealed end of the metal tube to a pre-oxidation temperature for a second predetermined time, and after the sealed end of the glass tube softens, moving the glass tube and the metal tube toward each other until the sealed end of the metal tube is inserted into the sealed end of the glass tube by a predetermined distance, so that the sealed end of the glass tube forms an inner and outer clamping seal with the sealed end of the metal tube;

[0025] c3) continuing to heat the sealed ends of the metal tube and the glass tube at a preset temperature for a third preset time.

[0026] In one embodiment of the present application, the preheating temperature is 500°C~800°C, and the pre-oxidation temperature and the preset temperature are 800°C~1000°C.

[0027] In one embodiment of the present application, the first preset time and the third preset time are 1 minute to 10 minutes, and the second preset time is 5 seconds to 3 minutes.

[0028] In one embodiment of the present application, the preset distance is 2 mm to 10 mm.

[0029] As can be seen from the above technical solution, the present invention discloses a glass tube and metal tube sealing device, which includes a fixing device, a sealing mold sleeve and a heating device, wherein the fixing device includes a first fixing part and a second fixing part, the first fixing part is used to fix the glass tube, and the second fixing part is used to fix the metal tube coaxially with the glass tube, and at least one of the first fixing part and the second fixing part can be arranged to move translationally so that the first fixing part and the second fixing part can move closer to and away from each other; the sealing mold sleeve includes a mold cavity that can accommodate the sealing end of the glass tube, the mold cavity has an annular molding part, the annular molding part is recessed in the axial direction away from the sealing mold sleeve, the annular molding part is used to accommodate and shape the glass melted and overflowed from the sealing end of the glass tube during the sealing process, and the sealing mold sleeve is relatively stationary with the first fixing part during the sealing process; the heating device includes at least one heating part, and the at least one heating part is used to heat the sealing end of the metal tube.

[0030] During use, the first fixing part fixes the glass tube and places the sealed end of the glass tube in the mold cavity of the sealing mold sleeve. The second fixing part fixes the metal tube and makes the sealed end of the metal tube coaxial with and in contact with the sealed end of the glass tube. The heating part is started to heat the sealed end of the metal tube to the pre-oxidation temperature and continues for a preset time. As the glass tube contacts the metal tube, the heat of the metal tube is transferred to the glass tube, causing the temperature of the sealed end of the glass tube to rise. After the sealed end of the glass tube softens, the first fixing part and the second fixing part move toward each other, causing the glass tube and the metal tube to move toward each other until the sealed end of the metal tube The end is inserted into the sealing end of the glass tube at a preset distance, so that the sealing end of the glass tube forms an inner and outer clamping sealing structure with the sealing end of the metal tube. During the process of inserting the sealing end of the metal tube into the sealing end of the glass tube, the glass at the sealing end of the glass tube will overflow in the radial direction of the glass tube under the squeezing action of the metal tube and enter the annular forming part. In this way, after cooling, the sealing end of the glass tube will form a regular shape consistent with the shape of the annular forming part; then the temperature is gradually lowered until the sealing end of the glass tube solidifies, and finally the sealing body of the glass tube and the metal tube is annealed to complete the sealing of the glass tube and the metal tube.

[0031] The above-mentioned glass tube and metal tube sealing device can position the metal tube and the glass tube respectively through the fixing device to ensure the stability of the relative position of the metal tube and the glass tube during the sealing process. At the same time, the sealing mold sleeve can limit and shape the deformation of the sealing position of the glass tube during the sealing process, thereby making the sealing position of the metal tube and the glass tube more uniform in the circumferential direction, and can effectively improve the sealing effect and sealing quality consistency of the glass tube and the metal tube, thereby improving the sealing quality.

[0032] The present invention also discloses a sealing method based on the above-mentioned glass tube and metal tube sealing device. Since the sealing method is based on the above-mentioned glass tube and metal tube sealing device, the sealing method should have the same beneficial effects as the above-mentioned glass tube and metal tube sealing device, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic structural diagram of a glass tube and metal tube sealing device provided in an embodiment of the present invention;

[0035] Figure 2 A cross-sectional view of a sealing mold sleeve of a glass tube and metal tube sealing device provided in an embodiment of the present invention;

[0036] Figure 3 A cross-sectional view of a sealing body between a glass tube and a metal tube provided in an embodiment of the present invention.

[0037] In the picture:

[0038] 100 is the first fixing part; 200 is the second fixing part; 300 is the sealing mold sleeve; 300a is the mold cavity; 300b is the annular forming part; 400 is the microwave generator; 500 is the high-frequency induction heating device; 510 is the high-frequency induction coil; 520 is the high-frequency electromagnetic generator; 600 is the insulation cavity; 700 is the sealing bracket; 710 is the sealing base; 720 is the sealing column; 800 is the glass tube; 800a is the clamping part; 900 is the metal tube. DETAILED DESCRIPTION

[0039] One of the core aspects of the present invention is to provide a glass tube and metal tube sealing device, the structural design of which enables it to improve the consistency of the sealing effect between the glass tube and the metal tube.

[0040] Another core of the present invention is to provide a sealing method including the above-mentioned glass tube and metal tube sealing device.

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figure 1 and Figure 2 .

[0043] An embodiment of the present application provides a glass tube and metal tube sealing device, which includes a fixing device, a sealing mold sleeve 300 and a heating device.

[0044] Among them, the fixing device includes a first fixing part 100 and a second fixing part 200. The first fixing part 100 is used to fix the glass tube 800, and the second fixing part 200 is used to fix the metal tube 900 coaxially with the glass tube 800. The first fixing part 100 and the second fixing part 200 can fix the metal tube 900 or the glass tube 800 by clamping. It should be noted that the first fixing part 100 and the second fixing part 200 can be manually clamped, or can be automatically clamped by a motor or other device. When the first fixing part 100 and the second fixing part 200 can automatically clamp the metal tube 900 and the glass tube 800 by a motor or other device, the glass tube and metal tube sealing device can also be equipped with a tube taking mechanism. The tube taking mechanism includes a multi-degree-of-freedom robotic arm and a tube taking component arranged at the front end of the multi-degree-of-freedom robotic arm to realize automatic grasping of the metal tube 900 and the glass tube 800. The tube taking component can be a clamp and / or a suction cup.

[0045] At least one of the first fixing part 100 and the second fixing part 200 can be arranged to be translated, that is, at least one of the first fixing part 100 and the second fixing part 200 can move along the axial direction of the fixed glass tube 800 and the metal tube 900, so that the first fixing part 100 and the second fixing part 200 can move towards and away from each other, so that the sealed end of the metal tube 900 can be inserted into the sealed end of the glass tube 800 to achieve sealing.

[0046] In the present application, only the first fixing portion 100 may be arranged to be translatably movable, only the second fixing portion 200 may be arranged to be translatably movable, or both the first fixing portion 100 and the second fixing portion 200 may be arranged to be translatably movable.

[0047] The relative movement of the first fixing part 100 and the second fixing part 200 can be achieved by manual movement, that is, at least one of the first fixing part 100 and the second fixing part 200 can be slidably set on a guide rod, and the first fixing part 100 or the second fixing part 200 can and can only move axially along the guide rod.

[0048] The first fixing part 100 and / or the second fixing part 200 can also achieve relative movement by connecting to a driving device, which includes but is not limited to a piston cylinder, a linear motor, a rotary motor and a transmission mechanism. At the same time, the relative displacement of the first fixing part 100 and the second fixing part 200 can be precisely controlled by controlling the feed amount of the driving device, thereby accurately controlling the distance by which the metal tube 900 is inserted into the glass tube 800, and further improving the consistency of the sealing between the metal tube 900 and the glass tube 800.

[0049] It is not difficult to understand that during the sealing process, the temperatures of the metal tube 900 and the glass tube 800 are both relatively high, and they are easily affected by temperature and expand and contract. Therefore, in order to ensure that the first fixing part 100 and the second fixing part 200 can stably fix the metal tube 900 and the glass tube 800 while avoiding the glass tube 800 from breaking or the metal tube 900 from deforming due to thermal expansion and contraction, in one embodiment of the present application, elastic buffer pads are provided on the clamping surfaces of the first fixing part 100 and the second fixing part 200.

[0050] It is foreseeable that during the sealing process between the metal tube 900 and the glass tube 800, the softened glass tube 800 will be squeezed by the metal tube 900 and overflow radially. Therefore, in order to ensure that the glass at the sealed end of the glass tube 800 is subjected to uniform force during the overflow process, so that the formed clamping portion 800q has a more uniform shape in the circumferential direction, in the present application, the first fixing portion 100 and the second fixing portion 200 are arranged in an upper and lower manner, and after the metal tube 900 and the glass tube 800 are fixed, their axes are perpendicular to the horizontal plane.

[0051] It should be noted that, during the fixing process, the metal tube 900 may be fixed on top of the glass tube 800 , or the glass tube 800 may be fixed on top of the metal tube 900 , which is not limited here.

[0052] In the present application, in addition to being able to move relative to each other, the first fixing part 100 and the second fixing part 200 can also rotate synchronously, thereby driving the metal tube 900 and the glass tube 800 to rotate synchronously. The centrifugal force generated by the rotation is used to make the sealing end of the softened glass tube 800 fully fit the annular forming part 300b of the sealing mold sleeve 300.

[0053] See also Figure 2 The sealing mold sleeve 300 includes a mold cavity 300a for accommodating the sealed end of the glass tube 800. The mold cavity 300a has an annular molding portion 300b, which is recessed away from the axis of the sealing mold sleeve 300. The annular molding portion 300b is used to accommodate and shape the melted glass overflowing from the sealed end of the glass tube 800 during the sealing process. During the sealing process, the sealing mold sleeve 300 remains stationary relative to the first fixing portion 100. The sealing mold sleeve 300 is made of a high-temperature resistant material such as graphite or ceramic.

[0054] The sealing mold sleeve 300 is a circumferentially closed structure, which can enclose a mold cavity 300a that is circumferentially closed and open at both ends. The mold cavity 300a is matched with the outer wall of the glass tube 800. The smaller the gap between the mold cavity 300a and the outer wall of the glass tube 800, the better. It is sufficient to ensure that the glass tube 800 can freely enter and exit the mold cavity 300a. This can prevent the sealed end of the softened glass tube 800 from being squeezed by the sealed end of the metal tube 900 and overflowing in a direction other than the annular molding part 300b.

[0055] It should be noted that the sealing mold sleeve 300 only needs to be relatively stationary with the first fixed part 100 during the sealing process, which does not mean that the sealing mold sleeve 300 is always relatively stationary with the first fixed part 100. In order to fix the glass tube 800 and remove the sealed glass tube 800, the sealing mold sleeve 300 is preferably able to move relative to the first fixed part 100 under other conditions except during the sealing process.

[0056] Since the sealing mold sleeve 300 needs to be stationary relative to the first fixing part 100 during the sealing process, in a specific embodiment of the present application, a solution in which the second fixing part 200 can be arranged to move horizontally is adopted, that is, during the sealing process, the first fixing part 100 fixes the glass tube 800 and remains stationary, and the second fixing part 200 drives the metal tube 900 to move toward the glass tube 800.

[0057] The sealing mold sleeve 300 can adopt an integrated structure, that is, the sealing mold sleeve 300 is an inseparable whole. In this case, the annular forming part 300b should be located at one end of the mold cavity 300a of the sealing mold sleeve 300, and the radial dimension of the annular forming part 300b should gradually expand along the end of the mold cavity 300a where the annular forming part 300b is not set toward the end where the annular forming part 300b is set, so as to ensure that the clamping part 800q produced after the sealing is completed can smoothly exit the sealing mold sleeve 300.

[0058] The sealing mold sleeve 300 can also adopt a split structure, that is, the sealing mold sleeve 300 is divided into multiple modules in the circumferential direction, and each module can move closer to and away from each other along the radial direction of the sealing mold sleeve 300. When the modules are close to each other to the extreme position, that is, the mold closing position, a circumferentially closed mold cavity 300a is formed. When the modules are away from each other to a preset gap between two adjacent modules, that is, the mold opening position, the sealed body can be easily removed. In this case, the annular forming part 300b can be located at any position of the mold cavity 300a of the sealing mold sleeve 300.

[0059] like Figure 1 As shown, the heating device includes at least one heating part, and the at least one heating part is used to heat the sealed end of the metal tube 900. That is, the heating device may include one heating part or multiple heating parts. When the heating device includes only one heating part, the heating part is used to heat the metal tube 900 and soften the sealed end of the glass tube 800 through the contact between the metal tube 900 and the glass tube 800. When the heating device includes multiple heating parts, each heating part can be used to heat the metal tube 900, or at least one heating part can be used to heat the metal tube 900, and the rest can be used to heat the glass tube 800, so as to shorten the subsequent heat conduction time of the metal tube 900 to the glass tube 800, increase the temperature of the glass tube 800, and improve the sealing efficiency.

[0060] During use, the first fixing portion 100 fixes the glass tube 800 and positions the sealed end of the glass tube 800 in the mold cavity 300a of the sealing mold sleeve 300. The second fixing portion 200 fixes the metal tube 900 so that the sealed end of the metal tube 900 is coaxial with and in contact with the sealed end of the glass tube 800. The heating device is started to heat the sealed end of the metal tube 900 to a pre-oxidation temperature and continues for a preset time. As the glass tube 800 contacts the metal tube 900, the heat of the metal tube 900 is transferred to the glass tube 800, causing the temperature of the sealed end of the glass tube 800 to rise. After the sealed end of the glass tube 800 softens, the first fixing portion 100 and the second fixing portion 200 are fixed to the metal tube 900. The fixing portion 200 moves toward each other, causing the glass tube 800 and the metal tube 900 to move toward each other until the sealed end of the metal tube 900 is inserted into the sealed end of the glass tube 800 by a preset distance, so that the sealed end of the glass tube 800 forms an inner and outer clamping seal structure with the sealed end of the metal tube 900. During the process of inserting the sealed end of the metal tube 900 into the sealed end of the glass tube 800, the glass at the sealed end of the glass tube 800 will overflow in the radial direction of the glass tube 800 under the squeezing action of the metal tube 900 and enter the annular forming portion 300b. In this way, after cooling, the sealed end of the glass tube 800 will form a regular shape that conforms to the shape of the annular forming portion 300b, as shown in FIG. Figure 3 and then gradually cooled until the sealed end of the glass tube 800 solidifies, and finally the sealing body of the glass tube 800 and the metal tube 900 is annealed to complete the sealing of the glass tube 800 and the metal tube 900.

[0061] In summary, compared with the prior art, the glass tube and metal tube sealing device provided in the embodiment of the present application can position the metal tube 900 and the glass tube 800 respectively through a fixing device, thereby ensuring the stability of the relative position of the metal tube 900 and the glass tube 800 during the sealing process. At the same time, the sealing mold sleeve 300 can limit and shape the deformation of the sealing position of the glass tube 800 during the sealing process, thereby making the sealing position of the metal tube 900 and the glass tube 800 more uniform in the circumferential direction, and can effectively improve the sealing effect and consistency of the sealing quality of the glass tube 800 and the metal tube 900, thereby improving the sealing quality.

[0062] See also Figure 1In one embodiment of the present application, the heating device includes at least two heating units: at least one glass heating unit for heating the glass tube 800 and at least one metal heating unit for heating the metal tube 900. The glass heating unit is disposed outside the sealing mold sleeve 300. The metal heating unit remains stationary relative to the second fixing unit 200 during the sealing process. This ensures that the metal heating unit remains stationary relative to the metal tube 900 throughout the sealing process to ensure effective heating of the metal tube 900 and prevent the advancement of the metal tube 900 within the glass tube 800 from being affected by the reduced heating effect. The glass heating unit is used to preheat the glass tube 800 before sealing, raising its temperature and shortening the time it takes for the sealed end of the glass tube 800 to soften due to heat transfer from the metal tube 900 to the glass tube 800.

[0063] Specifically, in one embodiment of the present application, the glass heating part is a microwave generator 400, which can act on the sealing mold sleeve 300 and the glass tube 800 to quickly heat up the sealing mold sleeve 300 and the glass tube 800. When the glass heating part is turned off, the sealing mold sleeve 300 can also have a certain insulation effect on the glass tube 800.

[0064] See also Figure 1 The metal heating part is a high-frequency induction heating device 500, which includes a high-frequency induction coil 510 and a high-frequency electromagnetic generator 520. The high-frequency induction coil 510 is coaxially arranged with the sealing mold sleeve 300, and the high-frequency electromagnetic generator 520 is electrically connected to the high-frequency induction coil 510. The high-frequency induction coil 510 is spiral-shaped. When the alternating current supplied by the high-frequency electromagnetic generator 520 passes through the high-frequency induction coil 510, an alternating magnetic field is generated, thereby causing an induced current inside the metal tube 900 in the high-frequency induction coil 510, and the purpose of heating the metal tube 900 is achieved by the Joule heat generated by the induced current.

[0065] Since the present application adopts a solution in which the second fixing part 200 drives the metal tube 900 to move horizontally, and the metal heating part needs to be relatively stationary with the second fixing part 200 during the sealing process, in the present application, the high-frequency induction coil 510 can also move horizontally with the second fixing part 200 to ensure that the high-frequency induction coil 510 can always follow the sealed end of the metal tube 900, thereby ensuring the heating effect of the sealed end of the metal tube 900.

[0066] Since the present application adopts the solution of heating the glass tube 800 before sealing, in order to avoid a large temperature drop of the glass tube 800 during the heating of the metal tube 900 and to avoid the glass heating part from always working to save energy, Figure 1As shown, the heating device also includes an insulation cavity 600, which is coaxially arranged outside the sealing mold sleeve 300 with the insulation cavity 600, that is, the insulation cavity 600 surrounds the outside of the sealing mold sleeve 300, and the glass heating part is arranged outside the insulation cavity 600. The glass heating part passes through the insulation cavity 600 to heat the sealing mold sleeve 300 and the glass tube 800.

[0067] As described above, in the present application, the high-frequency induction coil 510 needs to move with the second fixed part 200 relative to the first fixed part 100 during the sealing process. In order to avoid interference between the insulation cavity 600 and the sealing mold sleeve 300 and the high-frequency induction coil 510 during the movement, an annular cavity for the metal heating part to enter and exit can be set in one of the insulation cavity 600 and the sealing mold sleeve 300, or an annular cavity for the metal heating part to enter and exit can be formed between the insulation cavity 600 and the sealing mold sleeve 300. That is, according to the radial dimensions of the high-frequency induction coil 510, the insulation cavity 600 and the sealing mold sleeve 300, the annular cavity can be set on the insulation cavity 600 or on the sealing mold sleeve 300, or it can be surrounded by the insulation cavity 600 and the sealing mold sleeve 300.

[0068] like Figure 1 As shown, in a specific embodiment of the present application, the insulation cavity 600 is coaxial with the sealing mold sleeve 300 and is arranged outside the sealing mold sleeve 300 with a gap. The annular gap between the insulation cavity 600 and the sealing mold sleeve 300 constitutes the annular cavity. One end of the sealing mold sleeve 300 is connected to the insulation cavity 600 through a connecting component, and the other end forms an entrance and exit for the metal heating part (high-frequency induction coil 510) to enter and exit.

[0069] In order to ensure that the high-frequency induction coil 510 can smoothly enter and exit the annular cavity, the inner diameter of the high-frequency induction coil 510 needs to be larger than the outer diameter of the sealing mold sleeve 300, and the outer diameter of the high-frequency induction coil 510 needs to be smaller than the inner diameter of the thermal insulation cavity 600. In a specific embodiment, the inner diameter of the high-frequency induction coil 510 is 20 mm larger than the outer diameter of the sealing mold sleeve 300, and the outer diameter of the high-frequency induction coil 510 is 40 mm smaller than the inner diameter of the thermal insulation cavity 600.

[0070] Further optimize the above technical solutions, such as Figure 2 As shown, in one embodiment of the present application, the surface of the annular forming portion 300b is a smooth curved surface, and the plane passing through the axis of the sealing mold sleeve 300 is used as the longitudinal bisector of the sealing mold sleeve 300. The intersection of the smooth curved surface and the longitudinal bisector is a smooth curve. The smooth curve can be an arc segment, or a segment formed by smoothly connecting an arc segment and a straight line segment, or the smooth curve can be formed by smoothly connecting multiple arc segments with different curvatures, so that the surface of the formed clamping portion 800q is smooth and has no edges and corners, thereby avoiding stress concentration.

[0071] like Figure 1 As shown, in one embodiment of the present application, the glass tube and metal tube sealing device further includes a sealing bracket 700 , and the fixing device, the sealing mold sleeve 300 and the heating device are respectively arranged on the sealing bracket 700 .

[0072] Please continue reading Figure 1 The sealing bracket 700 includes a sealing base 710 and a sealing column 720 . The sealing column 720 is disposed on the sealing base 710 . The fixing device, the sealing mold sleeve 300 and the heating device are respectively disposed on the sealing column 720 .

[0073] To sum up, in the present application, the relative movement of the first fixing part 100 and the second fixing part 200, the clamping and loosening of the glass tube 800 by the first fixing part 100, the clamping and loosening of the metal tube 900 by the second fixing part 200, the start and stop of the metal heating part and the glass heating part, etc. can all be automatically controlled by motors, sensors, piston cylinders and other equipment, so that the sealing of the metal tube 900 and the glass tube 800 can be automatically carried out according to the procedure, reducing labor costs and being suitable for large-scale automatic industrial production.

[0074] The present application also discloses a sealing method based on the glass tube and metal tube sealing device in the above embodiment, the sealing method comprising the steps of:

[0075] a) Fix the glass tube 800 and position the sealed end of the glass tube 800 in the mold cavity 300a of the sealing mold sleeve 300 of the glass tube and metal tube sealing device.

[0076] When fixing, the clamping force of the first fixing part 100 is adjusted, that is, it is necessary to ensure the stability of the glass tube 800 so that the glass tube 800 remains stable during the process of inserting the sealed end of the metal tube 900 into the sealed end of the glass tube 800, and it is necessary to avoid excessive clamping force, which may cause the glass tube 800 to expand and deform due to subsequent temperature increase and cracks.

[0077] b) Fix the metal tube 900 so that the sealed end of the metal tube 900 and the sealed end of the glass tube 800 are coaxial and in contact with each other.

[0078] Whether the metal tube 900 and the glass tube 800 are coaxial when being fixed has a significant impact on the final sealing quality. Therefore, the coaxiality of the glass tube 800 and the metal tube 900 can be checked with the help of a micrometer when being fixed.

[0079] c) heating the sealed end of the metal tube 900 to a pre-oxidation temperature for a predetermined time. After the sealed end of the glass tube 800 softens, the glass tube 800 and the metal tube 900 are moved toward each other until the sealed end of the metal tube 900 is inserted into the sealed end of the glass tube 800 by a predetermined distance, so that the sealed end of the glass tube 800 forms an inner and outer clamping seal with the sealed end of the metal tube 900.

[0080] By heating the sealed end of the metal tube 900 to a pre-oxidation temperature and maintaining it for a preset time, the metal tube 900 can be pre-oxidized to form a dense and consistent oxide film on the sealed end of the metal tube 900, thereby improving the bonding strength and wetting performance of the subsequent glass and metal sealing.

[0081] d) gradually cooling the glass tube 800 until the sealed end is solidified, annealing the sealed body between the glass tube 800 and the metal tube 900, and completing the sealing of the glass tube 800 and the metal tube 900.

[0082] After the sealed end of the glass tube 800 solidifies, the sealed body of the glass tube 800 and the metal tube 900 is immediately transferred to an annealing furnace for annealing to eliminate stress and prevent deformation and cracking of the sealed portion of the glass tube 800 and the metal tube 900.

[0083] To further optimize the above technical solution, the above step c) specifically includes:

[0084] c1) heating the sealed end of the glass tube 800 to a preheating temperature for a first preset time.

[0085] The preheating temperature is 500° C. to 800° C., and the first preset time is 1 minute to 10 minutes, thereby increasing the temperature of the sealed end of the glass tube 800 . The preheating temperature and duration can be determined according to the material and wall thickness of the glass tube 800 .

[0086] c2) heating the sealed end of the metal tube 900 to a pre-oxidation temperature for a second predetermined time. After the sealed end of the glass tube 800 softens, the glass tube 800 and the metal tube 900 are moved toward each other until the sealed end of the metal tube 900 is inserted into the sealed end of the glass tube 800 by a predetermined distance, so that the sealed end of the glass tube 800 forms an inner and outer clamping seal with the sealed end of the metal tube 900.

[0087] The pre-oxidation temperature is 800°C~1000°C. At this temperature, a dense oxide film can be formed on the sealed end of the metal tube 900. The second preset time is 5 seconds~3 minutes. The second preset time is determined according to the material of the metal tube 900 and the thickness of the tube wall. The preset distance is 2mm~10mm.

[0088] c3) continuing to heat the sealed ends of the metal tube 900 and the glass tube 800 at a preset temperature for a third preset time.

[0089] The preset temperature is 800° C. to 1000° C., and the third preset time is 1 minute to 10 minutes, to ensure that the metal tube 900 and the glass tube 800 have sufficient time to come into contact with each other, thereby avoiding bubbles from forming between the two and affecting the sealing quality.

[0090] Specifically, in a specific embodiment of the present application, the sealing method specifically includes:

[0091] a) Install the glass tube 800 on the first fixing part 100 , and move the glass tube 800 into the sealing mold 300 through the first fixing part 100 , so that the bottom of the glass tube 800 is aligned with the annular forming part 300 b in the sealing mold 300 .

[0092] b) Install the metal tube 900 on the second fixing part 200 , and move the metal tube 900 through the second fixing part 200 so that the top of the metal tube 900 is coaxially aligned and in contact with the bottom of the glass tube 800 .

[0093] c) The microwave generator 400 is turned on to apply microwaves to the sealing mold 300 and the glass tube 800 for rapid heating. The temperature of the glass tube 800 is controlled at 700° C. and maintained for 10 minutes. The microwave generator 400 is then turned off.

[0094] d) Move the high-frequency induction coil 510 so that the top of the high-frequency induction coil 510 is flush with the top of the metal tube 900. Immediately start the high-frequency electromagnetic generator 520 to heat the metal tube 900 to 900°C and maintain it for 30 seconds. Then, slowly move the metal tube 900 upward. The high-frequency induction coil 510 and the metal tube 900 move synchronously, so that the top of the metal tube 900 is gradually inserted into the wall of the sealed end of the glass tube 800. Figure 3 As shown, until the top of the metal tube 900 is inserted into the wall of the sealed end of the glass tube 800 by a length L = 6 mm, under the extrusion and pushing action of the metal tube 900, the molten glass passes through the annular forming portion 300b of the sealing mold sleeve 300 to control the glass at the sealing point to form a convex and smooth curved surface, thereby forming a clamping structure between the inner and outer walls of the glass tube 800 and the metal tube 900;

[0095] e) controlling the temperature of the metal tube 900 at 900° C. and continuing to operate the high-frequency electromagnetic generator 520 for 10 minutes, then turning off the high-frequency electromagnetic generator 520 and gradually lowering the temperature;

[0096] f) The sealed body of the glass tube 800 and the metal tube 900 is taken out and placed in an annealing furnace for annealing. After annealing, the sealing of the glass tube 800 and the metal tube 900 is completed.

[0097] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0098] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0099] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0100] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A glass tube and metal tube sealing device, characterized in that: include: A fixing device comprises a first fixing portion (100) and a second fixing portion (200), wherein the first fixing portion (100) is used to fix the glass tube (800), and the second fixing portion (200) is used to fix the metal tube (900) coaxially with the glass tube (800), and at least one of the first fixing portion (100) and the second fixing portion (200) is arranged to be translatably movable so that the first fixing portion (100) and the second fixing portion (200) can move closer to and farther from each other; The sealing mold sleeve (300) comprises a mold cavity (300a) capable of accommodating the sealing end of the glass tube (800), the mold cavity (300a) having an annular forming portion (300b), the annular forming portion (300b) being recessed in a direction away from the axis of the sealing mold sleeve (300), the annular forming portion (300b) being used to accommodate and shape glass that melts and overflows from the sealing end of the glass tube (800) during the sealing process, and the sealing mold sleeve (300) is relatively stationary with the first fixing portion (100) during the sealing process; The heating device comprises at least one heating portion, and the at least one heating portion is used to heat the sealed end of the metal tube (900).

2. The glass tube and metal tube sealing device according to claim 1, characterized in that: The heating device comprises a glass heating portion for heating a glass tube (800) and a metal heating portion for heating a metal tube (900); the glass heating portion is arranged outside the sealing mold sleeve (300); and the metal heating portion is relatively stationary with the second fixing portion (200) during the sealing process.

3. The glass tube and metal tube sealing device according to claim 2, characterized in that: The glass heating part is a microwave generator (400).

4. The glass tube and metal tube sealing device according to claim 3, characterized in that: The metal heating part comprises a high-frequency induction coil (510) and a high-frequency electromagnetic generator (520); the high-frequency induction coil (510) is coaxially arranged with the sealing mold sleeve (300); and the high-frequency electromagnetic generator (520) is electrically connected to the high-frequency induction coil (510).

5. The glass tube and metal tube sealing device according to any one of claims 2 to 4, characterized in that: The heating device further comprises a heat-insulating cavity (600), the heat-insulating cavity (600) and the sealing mold sleeve (300) are coaxially sleeved outside the sealing mold sleeve (300), and the glass heating part is arranged outside the heat-insulating cavity (600).

6. The glass tube and metal tube sealing device according to claim 5, characterized in that: One of the heat-insulating cavity (600) and the sealing mold sleeve (300) is provided with an annular cavity for the metal heating part to enter and exit, or an annular cavity for the metal heating part to enter and exit is formed between the heat-insulating cavity (600) and the sealing mold sleeve (300).

7. The glass tube and metal tube sealing device according to any one of claims 1 to 4, characterized in that: The surface of the annular forming portion (300b) is a smooth curved surface.

8. The glass tube and metal tube sealing device according to any one of claims 1 to 4, characterized in that: It also includes a sealing bracket (700), and the fixing device, the sealing mold sleeve (300) and the heating device are respectively arranged on the sealing bracket (700).

9. A sealing method for a glass tube and a metal tube according to any one of claims 1 to 8, characterized in that: Including steps: a) fixing the glass tube (800) and positioning the sealed end of the glass tube (800) within the mold cavity (300a) of the sealing mold sleeve (300) of the glass tube and metal tube sealing device; b) fixing the metal tube (900) so that the sealed end of the metal tube (900) and the sealed end of the glass tube (800) are coaxial and in contact with each other; c) heating the sealed end of the metal tube (900) to a pre-oxidation temperature for a preset time, and after the sealed end of the glass tube (800) softens, moving the glass tube (800) and the metal tube (900) toward each other until the sealed end of the metal tube (900) is inserted into the sealed end of the glass tube (800) by a preset distance, so that the sealed end of the glass tube (800) forms an inner and outer clamping sealing structure with the sealed end of the metal tube (900); d) gradually cooling the glass tube (800) until the sealed end of the glass tube (800) solidifies, annealing the sealed body of the glass tube (800) and the metal tube (900), and completing the sealing of the glass tube (800) and the metal tube (900).

10. The sealing method according to claim 9, characterized in that: The step c) comprises: c1) heating the sealed end of the glass tube (800) to a preheating temperature and continuing for a first preset time; c2) heating the sealed end of the metal tube (900) to a pre-oxidation temperature and continuing for a second preset time, and after the sealed end of the glass tube (800) softens, moving the glass tube (800) and the metal tube (900) toward each other until the sealed end of the metal tube (900) is inserted into the sealed end of the glass tube (800) by a preset distance, so that the sealed end of the glass tube (800) forms an inner and outer clamping sealing structure with the sealed end of the metal tube (900); c3) continuing to heat the sealed ends of the metal tube (900) and the glass tube (800) at a preset temperature for a third preset time.

11. The sealing method according to claim 10, characterized in that: The preheating temperature is 500°C to 800°C, and the pre-oxidation temperature and the preset temperature are 800°C to 1000°C.

12. The sealing method according to claim 10, characterized in that: The first preset time and the third preset time are 1 minute to 10 minutes, and the second preset time is 5 seconds to 3 minutes.

13. The sealing method according to claim 10, characterized in that: The preset distance is 2mm~10mm.

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