A vacuum glass tube heater for defrosting and its manufacturing method

Abstract

The present application discloses a vacuum glass tube heater for defrosting and its manufacturing method, which includes an outer glass tube, an inner glass tube, a sealing plug and a rubber sleeve. The diameter of the inner glass tube is smaller than that of the outer glass tube, and the inner glass tube is coaxially arranged in the outer glass tube. The sealing plug is tubular, and one sealing plug is arranged at each end of the inner glass tube and the outer glass tube. The sealing plug is inserted between the outer glass tube and the inner glass tube and seals its end. One rubber sleeve is arranged at each end of the outer glass tube. One end of the rubber sleeve is provided with a receiving cavity for receiving the outer glass, and the end of the outer glass tube is inserted into the receiving cavity. A wire passing hole is provided on the end face of the rubber sleeve away from the outer glass tube. A heating wire is arranged in the inner glass tube, and wires are connected to both ends of the heating wire. The present application has the effects of saving production costs, improving the safety and production efficiency of the heater.

Description

Technical Field

[0001] This application relates to the technical field of heaters, and in particular to a vacuum glass tube heater for defrosting and its manufacturing method. Background Art

[0002] In a frost-free air-cooled refrigerator, the evaporator for heat exchange will condense the water vapor in the air into frost, and the condensed frost will adhere to the surface of the evaporator. When the thickness of the frost adhering to the surface of the evaporator reaches a certain level, it will affect the heat exchange capacity of the evaporator, causing the temperature inside the refrigerator to not reach the set value, thus resulting in the deterioration and damage of food. Therefore, it is necessary to use a heater to remove the frost adhering to the evaporator to ensure the good function of the evaporator.

[0003] Currently, the commonly used refrigerants in refrigerators are environmentally friendly refrigerants such as propane and isobutane, and the ignition points of these refrigerants are relatively low. To ensure that even when refrigerant leakage occurs, it will not be ignited and cause safety risks, it is necessary to control the surface temperature of the heater within a range more than 100 °C lower than the ignition point of the refrigerant. The currently commonly used technical solution is to make the glass tube heater double-layered to effectively reduce the surface temperature of the heater.

[0004] Currently, Chinese Patent No. CN200480004840.X discloses a defrosting heater and its manufacturing method. By installing one-way valves at both ends of the glass tube heater, air can only escape outward and cannot enter the glass tube heater from the outside. Thus, even when refrigerant leakage occurs, the flammable refrigerant cannot enter the glass tube heater.

[0005] Regarding the above related technologies, the inventor believes that the production cost of the above glass tube heater materials is relatively high, the production process is complex, the production efficiency is low, and the assembly is relatively difficult. In addition, since the one-way valve is exposed on the outer surface of the heater, it can be directly contacted from the outside. When the one-way valve is deformed, damaged or even detached by external force, its function will fail. Summary of the Invention

[0006] In order to save production costs, improve the safety and production efficiency of the heater, this application provides a vacuum glass tube heater for defrosting and its manufacturing method.

[0007] A vacuum glass tube heater for defrosting and its manufacturing method provided by this application adopt the following technical solutions:

[0008] A vacuum glass tube heater for defrosting and its manufacturing method, comprising an outer glass tube, an inner glass tube, a sealing plug and a rubber sleeve. The diameter of the inner glass tube is smaller than that of the outer glass tube. The inner glass tube is coaxially arranged in the outer glass tube. The sealing plug is arranged in a tubular shape, and one sealing plug is arranged at each of the two ends of the inner glass tube and the outer glass tube. The sealing plug is inserted between the outer glass tube and the inner glass tube and seals its end. One rubber sleeve is provided at each of the two ends of the outer glass tube. One end of the rubber sleeve is provided with a receiving cavity for receiving the outer glass tube. The end of the outer glass tube is inserted into the receiving cavity. A wire passing hole is opened on the end face of the rubber sleeve away from the outer glass tube. A heating wire is arranged in the inner glass tube, and wires are connected to both ends of the heating wire. The wires extend out of the rubber sleeve through the wire passing hole.

[0009] By adopting the above technical solution, the sealing plug is inserted between the outer glass tube and the inner glass tube to make the two coaxially arranged, avoiding the possibility that the inner glass tube directly contacts the external environment and ignites the leaked refrigerant. The rubber sleeve is sleeved on the end of the outer glass tube, covering the end faces of the sealing plug, the inner glass tube and the outer glass tube, playing a role of support, protection and insulation. Through the mutual cooperation of the outer glass tube, the inner glass tube, the sealing plug and the rubber sleeve, it has the effects of saving production costs, improving the safety and production efficiency of the heater.

[0010] Optionally, a connection terminal is arranged in the rubber sleeve. The connection terminal is in a tubular shape. The connection terminal is sleeved on the outside of the connection part of the wire and the heating wire. One end of the connection terminal is inserted into the wire passing hole. A gasket is coaxially connected to the outer ring wall of the connection terminal. The length of the inner glass tube is greater than that of the outer glass tube. The two ends of the inner glass tube extend out of the outer glass tube and extend into the receiving cavity. The gasket abuts against the end of the inner glass tube.

[0011] By adopting the above technical solution, the connection terminal protects the wire and the heating wire. The gasket abuts against the end of the inner glass tube, realizing the position limitation of the heating wire and avoiding its displacement along its axis in the inner glass tube.

[0012] Optionally, a fixing counterbore is coaxially opened on the inner bottom wall of the rubber sleeve. The shape of the fixing counterbore corresponds to the shape of the end of the inner glass tube. The end of the inner glass tube extends into the fixing counterbore. The gasket is embedded in the fixing counterbore. The gasket is clamped between the end of the inner glass tube and the inner bottom wall of the fixing counterbore.

[0013] By adopting the above technical solution, the setting of the fixed counterbore realizes the limitation of the position of the gasket, reducing the possibility of the gasket slipping relatively along the end face of the inner glass tube. It reduces the possibility that the heating wire is deformed due to the slipping of the gasket, resulting in unstable resistance value and affecting its heating power.

[0014] Optionally, an insertion conical surface is circumferentially provided on the outer ring wall at one end of the sealing plug inserted between the outer glass tube and the inner glass tube, and a gas guiding groove is provided on the insertion conical surface, and one end of the gas guiding groove extends to the end face of the sealing plug.

[0015] By adopting the above technical solution, the setting of the gas guiding groove facilitates the operator to semi-insert the sealing plug between the inner glass tube and the outer glass tube. The operator extracts the air between the inner glass tube and the outer glass tube through the gas guiding groove. After the vacuum extraction is completed, the sealing plug is completely inserted between the inner glass tube and the outer glass tube. Since the space between the inner glass tube and the outer glass tube is set to be vacuum, it helps to isolate the temperature of the inner glass tube and reduces the possibility of the leaked combustion-supporting agent burning.

[0016] Optionally, a connecting rubber tube is connected to one end of the rubber sleeve away from the outer glass tube. The connecting rubber tube is communicated with the wire through hole, the wire is inserted into the connecting rubber tube, and a sealing member for sealing the connecting rubber tube and the wire is provided on the connecting rubber tube.

[0017] By adopting the above technical solution, the connecting rubber tube supports and protects the wire. By providing a sealing member on the connecting rubber tube, the possibility of external water vapor entering the inner glass tube and causing the heating wire to rust is reduced.

[0018] Optionally, the sealing member includes a sealing protrusion. The sealing protrusion is annularly arranged on the inner ring wall of the connecting rubber tube, and the sealing protrusion abuts against the wire.

[0019] By adopting the above technical solution, the wire is inserted into the connecting rubber tube, and several sealing protrusions simultaneously abut against the wire, realizing the sealing of the connecting rubber tube, isolating external water vapor, and reducing the possibility of the heating wire rusting.

[0020] Optionally, the sealing member includes a cable tie. The cable tie is connected to the outside of the connecting rubber tube.

[0021] By adopting the above technical solution, after the assembly of the heater is completed, the cable tie is tied around the outside of the connecting rubber tube, realizing the sealing of the connecting rubber tube, and avoiding the possibility that the wire is pulled externally and the connecting rubber tube is deformed and loses the sealing effect.

[0022] Optionally, support blocks are connected to the outer circumferential wall of the rubber sleeve, and mounting blocks are connected to the outer circumferential wall of the rubber sleeve. The mounting blocks and the support blocks are symmetrically arranged with respect to the central axis of the rubber sleeve, and a water baffle is connected between the mounting blocks of the two rubber sleeves.

[0023] By adopting the above technical solution, the support blocks stably support the heater, reducing the possibility of the heater falling off due to rolling. The water baffle is arranged above the outer glass tube. During the heating and defrosting process of the heater, the melted water will not directly drip outside the outer glass tube, reducing the possibility of the outer glass tube suddenly cracking due to sudden cooling.

[0024] A manufacturing method of a vacuum glass tube heater for defrosting, characterized by comprising the following steps:

[0025] Pre-assembly: Place the inner glass tube into the outer glass tube, and pre-insert two sealing plugs between the inner glass tube and the outer glass tube from both ends. The outer glass tube covers half of the air guide grooves.

[0026] Vacuum pumping: Place the pre-assembled inner glass tube, outer glass tube, and sealing plugs as a whole into a vacuum pumping device for vacuum pumping operation.

[0027] Sealed assembly: When the vacuum degree in the vacuum pumping device reaches the set value, fully insert the sealing plugs between the inner glass tube and the outer glass tube, and the outer glass tube completely covers the air guide grooves.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. Through the mutual cooperation of the outer glass tube, inner glass tube, sealing plugs, and rubber sleeve, it has the effects of saving production costs, improving the safety and production efficiency of the heater;

[0030] 2. The setting of the sealing protrusions realizes the sealing of the connecting rubber tube, isolates external water vapor, and reduces the possibility of the heating wire rusting;

[0031] 3. The setting of the support blocks stably supports the heater, reducing the possibility of the heater falling off due to rolling. The setting of the water baffle reduces the possibility of the outer glass tube suddenly cracking due to sudden cooling. Description of the Drawings

[0032] Figure 1 is a structural schematic diagram of Embodiment 1 of the present application for embodying a vacuum glass tube heater for defrosting and its manufacturing method.

[0033] Figure 2 is a partial cross-sectional view of the rubber sleeve in Embodiment 1 of the present application for embodying the internal structure.

[0034] Figure 3 It is a cross-sectional view used to show the connection structure between the rubber sleeve and the connection terminal in Embodiment 1 of the present application.

[0035] Figure 4 It is a schematic structural diagram used to show a manufacturing method of a vacuum glass tube heater for defrosting in Embodiment 1 of the present application.

[0036] Figure 5 It is a schematic structural diagram used to show a vacuum glass tube heater for defrosting in Embodiment 2 of the present application.

[0037] Figure 6 It is a schematic structural diagram used to show a vacuum glass tube heater for defrosting in Embodiment 3 of the present application.

[0038] Explanation of reference numerals: 1, inner glass tube; 2, outer glass tube; 3, heating wire; 4, wire; 5, sealing plug; 51, positioning buffer ring; 52, insertion conical surface; 53, air guide groove; 6, rubber sleeve; 61, accommodation cavity; 62, wire through hole; 63, fixing counterbore; 7, connecting rubber tube; 71, sealing protrusion; 8, connection terminal; 9, gasket; 10, cable tie; 11, support block; 12, mounting block; 13, insertion hole; 14, water baffle; 15, insertion plate; 16, anti-movement structure. Detailed implementation manners

[0039] The following will Figure 1-6 make a further detailed description of the present application. Embodiment of the present application provides a vacuum glass tube heater for defrosting and its manufacturing method, which has the effects of saving production costs, improving the safety and production efficiency of the heater.

[0040] Embodiment 1

[0041] Referring to Figure 1 and Figure 2 , a vacuum glass tube heater for defrosting and its manufacturing method include an inner glass tube 1, an outer glass tube 2, a heating wire 3, a wire 4, a sealing plug 5 and a rubber sleeve 6. The diameter of the inner glass tube 1 is smaller than that of the outer glass tube 2, and the length of the inner glass tube 1 is greater than that of the outer glass tube 2. The inner glass tube 1 is coaxially arranged inside the outer glass tube 2, and both ends of the inner glass tube 1 extend out of both ends of the outer glass tube 2, and the lengths of both ends of the inner glass tube 1 extending out of both ends of the outer glass tube 2 are the same. The outer diameter of the inner glass tube 1 is 10.5 mm, and the wall thickness is 1.0 mm. The outer diameter of the outer glass tube 2 is 20 mm or 22 mm, and the wall thickness is 1.2 mm - 1.5 mm.

[0042] Referring to Figure 2-4, a sealing plug 5 and a rubber sleeve 6 are provided at both ends of the outer glass tube 2. The sealing plug 5 is made of rubber or a material with equivalent elasticity. The sealing plug 5 is cylindrical. One end of the sealing plug 5 is connected with a positioning buffer ring 51, and the outer diameter of the positioning buffer ring 51 is larger than that of the sealing plug 5. An insertion conical surface 52 is arranged along the circumferential direction on the outer ring wall of the end of the sealing plug 5 away from the positioning buffer ring 51, and a plurality of air guide grooves 53 are arranged at equal angular intervals along the circumferential direction on the insertion conical surface 52. One end of the air guide groove 53 extends to the end of the sealing plug 5, and the extension lines of the plurality of air guide grooves 53 converge at the same point on the central axis of the sealing plug 5. The sealing plug 5 is inserted between the outer glass tube 2 and the inner glass tube 1, and the positioning buffer ring 51 abuts against the end of the outer glass tube 2.

[0043] Refer to Figure 2 , a heating wire 3 is arranged in the inner glass tube 1. The middle section of the heating wire 3 is arranged in a spiral shape, and both ends of the heating wire 3 are arranged in a straight line. One wire 4 is provided at both ends of the heating wire 3. The rubber sleeve 6 is cylindrical. One end of the rubber sleeve 6 is open. An accommodation cavity 61 for accommodating the outer glass tube 2 is arranged inside the rubber sleeve 6. The outer diameter of the positioning buffer ring 51 is equal to the outer diameter of the outer glass tube 2. The end of the outer glass tube 2 is inserted into the rubber sleeve 6 and abuts against one side of the positioning buffer ring 51. The inner ring wall of the end of the outer glass tube 2 fits with the outer ring wall of the sealing plug 5, and the outer ring wall of the end of the outer glass tube 2 is arranged in a fitting manner with the inner ring wall of the accommodation cavity 61.

[0044] Refer to Figure 2 and Figure 3 , a wire 4 through hole is coaxially arranged at one end of the rubber sleeve 6. A connecting rubber tube 7 is connected to the end of the rubber sleeve 6 away from the outer glass tube 2, and the connecting rubber tube 7 is communicated with the wire 4 through hole. A sealing member is arranged on the connecting rubber tube 7. The sealing member includes a sealing protrusion 71. A plurality of sealing protrusions 71 are arranged in a ring shape on the inner ring wall of the connecting rubber tube 7. The inner diameter of the sealing protrusion 71 is smaller than the diameter of the wire 4. A fixing counterbore 63 for accommodating the inner glass tube 1 is arranged on the inner bottom wall of the accommodation cavity 61. The inner diameter of the fixing counterbore 63 is the same as the outer diameter of the inner glass tube 1. The length of the inner glass tube 1 extending out of the outer glass tube 2 is slightly larger than the depth of the fixing counterbore 63.

[0045] Refer to the figure. A connecting terminal 8 is arranged in the accommodation cavity 61. The connecting terminal 8 is tubular. The connecting terminal 8 is sleeved and connected to the connection part of the heating wire 3 and the wire 4 by riveting. A circular gasket 9 is coaxially and fixedly connected to the outer ring wall of the middle section of the connecting terminal 8. The plane where the gasket 9 is located is perpendicular to the central axis of the connecting terminal 8. One end of the connecting terminal 8 is inserted into the wire 4 through hole, and the gasket 9 is clamped between the inner bottom wall of the fixing counterbore 63 and the end of the inner glass tube 1. The diameter of the gasket 9 is between the inner diameter and the outer diameter of the inner glass tube 1.

[0046] Refer toFigure 2-4 When installing the glass tube heater, place the inner glass tube 1 inside the outer glass tube 2 and make the lengths of both ends of the inner glass tube 1 extending out of the outer glass tube 2 equal. Insert two sealing plugs 5 into the space between the inner glass tube 1 and the outer glass tube 2 from both ends of the outer glass tube 2 respectively, and make the outer glass tube 2 cover half of the air guide groove 53. Place the whole assembly of the connected outer glass tube 2, inner glass tube 1 and two sealing plugs 5 on the workbench of a vacuum pumping box (not shown in the attached drawings) connected to a vacuum pump. Close the door of the vacuum pumping box and turn on the vacuum pump. At this time, the air in the vacuum pumping box is pumped out, and the air between the outer glass tube 2 and the inner glass tube 1 is pumped out and discharged outside the box along the air guide groove 53 provided on the sealing plug 5.

[0047] Refer to Figure 2 and Figure 4 When the vacuum degree inside the vacuum pumping box reaches the set value, use a squeezing device (not shown in the attached drawings) to squeeze the two sealing plugs 5 as a whole into the space between the outer glass tube 2 and the inner glass tube 1. At this time, the whole outer glass tube 2 covers the air guide groove 53, and the positioning buffer ring 51 abuts against the end of the outer glass tube 2, forming a vacuum sealing structure. The setting of the positioning buffer ring 51, on the one hand, avoids the sliding of the sealing plug 5 into the interior of the outer glass tube 2 and the inner glass tube 1 under the action of atmospheric pressure after vacuum assembly, which is not convenient for taking out the sealing plug 5. On the other hand, the setting of the positioning buffer ring 51 protects the end of the outer glass tube 2. During assembly, the force acts on the sealing plug 5 to form a buffer, reducing the possibility of the outer glass tube 2 and the inner glass tube 1 being broken by collision.

[0048] Refer to Figure 2 and Figure 3 After completing the connection of the outer glass tube 2, inner glass tube 1 and the sealing plug 5, place the heating wire 3 into the inner glass tube 1, and use the connection terminal 8 to connect the two wires 4 to both ends of the heating wire 3. The gasket 9 on the connection terminal 8 abuts against the end of the inner glass tube 1. Socket two rubber sleeves 6 on both ends of the outer glass tube 2 respectively, and the inner bottom wall of the accommodation cavity 61 abuts against the end of the outer glass tube 2. The end of the inner glass tube 1 and the gasket 9 extend into the fixed counterbore 63, and one end of the connection terminal 8 passes through the through hole of the wire 4 and extends into the connecting rubber tube 7.

[0049] Refer to Figure 2, since the depth of the fixed counterbore 63 is slightly less than the length by which the inner glass tube 1 extends out of the outer glass tube 2, the gasket 9 can be fully pressed against the inner bottom wall of the fixed counterbore 63. In addition, since the diameter of the gasket 9 is close to the inner diameter of the fixed counterbore 63, the possibility that the gasket 9 slides relatively on the end face of the inner glass tube 1, causing the heating wire 3 disposed between the two connection terminals 8 to deform, resulting in unstable resistance value and affecting its heating power, is reduced. The rubber sleeve 6 is sleeved on the end of the outer glass tube 2, covering the end faces of the connection terminal 8, the gasket 9, the sealing plug 5, the inner glass tube 1, and the outer glass tube 2, playing the roles of support, protection, and insulation.

[0050] Refer to Figure 2 and Figure 3 , the wire 4 is inserted into the connecting rubber tube 7, and a plurality of sealing protrusions 71 are simultaneously pressed against the wire 4, realizing the sealing of the connecting rubber tube 7 and reducing the possibility that external water vapor enters the accommodation cavity 61 and the inside of the small glass tube through the connecting rubber tube 7 and corrodes the heating wire 3.

[0051] The implementation principle of a defrosting vacuum glass tube heater and its manufacturing method in Embodiment 1 of the present application is as follows: When installing the glass tube heater, place the inner glass tube 1 inside the outer glass tube 2, insert the sealing plug 5 between the inner glass tube 1 and the outer glass tube 2, and make the outer glass tube 2 cover half of the air guide groove 53. Place the whole in a vacuum pumping box for vacuum pumping. Squeeze the two sealing plugs 5 as a whole between the outer glass tube 2 and the inner glass tube 1, place the heating wire 3 in the inner glass tube 1, and use the connection terminal 8 to connect the two wires 4 to both ends of the heating wire 3.

[0052] Since the diameter of the gasket 9 is close to the inner diameter of the fixed counterbore 63, the possibility that the gasket 9 slides relatively on the end face of the inner glass tube 1 is reduced, which may cause the heating wire 3 to deform, resulting in unstable resistance value and affecting its heating power. The rubber sleeve 6 plays the roles of support, protection, and insulation. The sealing protrusion 71 realizes the sealing of the connecting rubber tube 7 and reduces the possibility that external water vapor enters the small glass tube and corrodes the heating wire 3.

[0053] Embodiment 2

[0054] Refer to Figure 5 , the difference between Embodiment 2 and Embodiment 1 is that the sealing member includes a cable tie 10 (the sealing member in this embodiment is not limited to the cable tie 10, and also includes components with the same function. The cable tie is just a representative example), and the cable tie 10 is bundled outside the connecting rubber tube 7 to tie the connecting rubber tube 7 and the wire 4 tightly.

[0055] In Embodiment 2 of the present application, the implementation principle of a vacuum glass tube heater for defrosting is as follows: After the assembly of the heater is completed, the wire tie 10 is bundled outside the connecting rubber tube 7. The setting of the wire tie 10 enables a tight connection between the wire 4 and the connecting rubber tube 7, avoiding the situation where under certain specific installation conditions, the wire 4 is pulled externally, causing the connecting rubber tube 7 to deform, resulting in the separation of the sealing protrusion 71 from the wire 4 and the loss of the sealing effect. The setting of the wire tie 10 further improves the sealing effect of the heater and reduces the possibility of the heating wire 3 being rusted.

[0056] Embodiment 3

[0057] Referring to Figure 6 , the difference between Embodiment 3 and Embodiment 1 is that a support block 11 and a mounting block 12 are fixedly connected to one side of the outer peripheral wall of the rubber sleeve 6, and the support blocks 11 are symmetrically arranged with the central axis of the rubber sleeve 6 as the center. A movement prevention structure 16 is fixedly connected to the end of the rubber sleeve 6 away from the outer glass tube.

[0058] Referring to Figure 6 , a plug hole 13 is formed in the mounting block 12, a water baffle 14 is arranged between the two mounting blocks 12, the water baffle 14 is made of an elastic material, and a plug board 15 is fixedly connected to both ends in the length direction of the water baffle 14. The two plug boards 15 are arranged in one-to-one correspondence with the two mounting blocks 12, and the plug board 15 is inserted into the corresponding plug hole 13. The shape and structure of the water baffle 14 in the figure are only examples, and it is not limited to this structure in actual use.

[0059] In Embodiment 3 of the present application, the implementation principle of a vacuum glass tube heater for defrosting is as follows: The setting of the support block 11 and the movement prevention structure 16 enables the heater to be stably placed, reducing the possibility of the heater sliding along the axial direction and falling off. By installing the water baffle 14 between the two mounting blocks 12, when the heater defrosts, the defrosting water will not directly drip onto the outer glass tube 2, thereby reducing the possibility of the outer glass tube 2 being suddenly cooled and broken.

[0060] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A vacuum glass tube heater for defrosting, characterized in that: It includes an outer glass tube (2), an inner glass tube (1), a sealing plug (5) and a rubber sleeve (6). The diameter of the inner glass tube (1) is smaller than that of the outer glass tube (2). The inner glass tube (1) is coaxially arranged in the outer glass tube (2). The sealing plug (5) is tubular. One sealing plug (5) is provided at each end of the inner glass tube (1) and the outer glass tube (2). The sealing plug (5) is inserted between the outer glass tube (2) and the inner glass tube (1) and seals its end. One rubber sleeve (6) is provided at each end of the outer glass tube (2). One end of the rubber sleeve (6) is provided with a receiving cavity (61) for receiving the outer glass tube (2). The end of the outer glass tube (2) is inserted into the receiving cavity (61). A wire (4) through hole is provided on the end face of the rubber sleeve (6) away from the outer glass tube (2). A heating wire (3) is arranged in the inner glass tube (1). Both ends of the heating wire (3) are connected with a wire (4). The wire (4) extends out of the rubber sleeve (6) through the wire (4) through hole. A connection terminal (8) is arranged in the rubber sleeve (6). The connection terminal (8) is tubular. The connection terminal (8) is sleeved outside the connection part of the wire (4) and the heating wire (3). One end of the connection terminal (8) is inserted into the wire (4) through hole. A gasket (9) is coaxially connected to the outer ring wall of the connection terminal (8). The length of the inner glass tube (1) is greater than that of the outer glass tube (2). Both ends of the inner glass tube (1) extend out of the outer glass tube (2) and extend into the receiving cavity (61). The gasket (9) abuts against the end of the inner glass tube (1). An insertion conical surface (52) is circumferentially provided on the outer ring wall of one end of the sealing plug (5) inserted between the outer glass tube (2) and the inner glass tube (1). An air guide groove (53) is provided on the insertion conical surface (52). One end of the air guide groove (53) extends to the end face of the sealing plug (5). A connecting rubber tube (7) is connected to one end of the rubber sleeve (6) away from the outer glass tube (2). The connecting rubber tube (7) is communicated with the wire (4) through hole. The wire (4) is inserted into the connecting rubber tube (7). A sealing member for sealing the connecting rubber tube (7) and the wire (4) is provided on the connecting rubber tube (7). One end of the sealing plug (5) is connected with a positioning buffer ring (51). The outer diameter of the positioning buffer ring (51) is greater than that of the sealing plug (5).

2. The vacuum glass tube heater for defrosting according to claim 1, wherein: A fixing counterbore (63) is coaxially provided on the inner bottom wall of the rubber sleeve (6). The shape of the fixing counterbore (63) corresponds to the shape of the end of the inner glass tube (1). The end of the inner glass tube (1) extends into the fixing counterbore (63). The gasket (9) is embedded in the fixing counterbore (63). The gasket (9) is clamped between the end of the inner glass tube (1) and the inner bottom wall of the fixing counterbore (63).

3. The vacuum glass tube heater for defrosting according to claim 1, characterized in that: The seal includes a sealing protrusion (71), the sealing protrusion (71) is arranged in a ring shape on the inner wall of the connecting rubber tube (7), and the sealing protrusion (71) is in tight contact with the wire (4).

4. A vacuum glass tube heater for defrosting according to claim 1, characterized in that: The seal includes a wire tie (10), and the wire tie (10) is connected to the outside of the connecting rubber tube (7).

5. The vacuum glass tube heater for defrosting according to claim 1, wherein: A support block (11) is connected to the outer wall of the rubber sleeve (6), an installation block (12) is connected to the outer wall of the rubber sleeve (6), the installation block (12) and the support block (11) are symmetrically arranged with the central axis of the rubber sleeve (6) as the axis of symmetry, and a water baffle (14) is connected between the installation blocks (12) of the two rubber sleeves (6).

6. The manufacturing method of a vacuum glass tube heater for defrosting according to claim 3, characterized in that: It includes the following steps: Pre-assembly: Put the inner glass tube (1) into the outer glass tube (2), and pre-insert two sealing plugs (5) between the inner glass tube (1) and the outer glass tube (2) from both ends, and the outer glass tube (2) covers half of the air guide groove (53); Vacuum pumping: Put the pre-assembled inner glass tube (1), outer glass tube (2) and sealing plug (5) as a whole into a vacuum pumping device for vacuum pumping operation; Sealed assembly: When the vacuum degree in the vacuum pumping device reaches the set value, insert the sealing plug (5) completely between the inner glass tube (1) and the outer glass tube (2), and the outer glass tube (2) completely covers the air guide groove (53).

Images