A thermistor encapsulation furnace

Abstract

This application relates to the technical field of encapsulation equipment, and specifically relates to a thermistor encapsulation furnace, which includes a lower heat preservation block. The lower heat preservation block is provided with a lower groove, and a lower installation channel is provided at the bottom of the lower groove; an upper heat preservation block, the upper heat preservation block is provided with an upper groove opposite to the lower groove, and an upper installation channel is provided at the bottom of the upper groove; a C-shaped tube, the C-shaped tube is fixedly installed in the cavity surrounded by the upper groove and the lower groove; an upper ceramic tube, a heating wire is wound around the outer peripheral side of the upper ceramic tube, and is clamped in the upper installation channel through an upper ceramic ring; a lower ceramic tube, a heating wire is wound around the outer peripheral side of the lower ceramic tube, and is held in the lower installation channel through a lower ceramic ring. Compared with the prior art, the heating wire is erected outside the C-shaped tube through the ceramic tube and the ceramic ring, avoiding the short circuit caused by the heating wire touching the C-shaped tube, and solving the problem of unstable installation in the past.

Description

Technical Field

[0001] The present application relates to a thermistor encapsulation furnace, which is applicable to the technical field of encapsulation equipment. Background Art

[0002] For existing thermistors, a glass shell is generally sleeved outside the chip. The glass shell is abbreviated as the glass envelope. During the production process, after the glass envelope is sleeved outside the chip (semi-finished resistor), it needs to be heated and melted to meet the factory standards of the finished product.

[0003] Referring to the patent document with the patent number CN2020110916166, it discloses a double-sided automatic welding and encapsulation device for a glass-encapsulated temperature sensor. The device discloses a heating device for melting and encapsulating the glass envelope. The heating device is divided into two groups and arranged before and after the flipping mechanism, namely pre-stage heating and post-stage heating. Both the pre-stage heating and the post-stage heating adopt spiral heating wires. The spiral heating wires in the pre-stage heating zone and the post-stage heating zone are both divided into groups, and each group of spiral heating wires is connected to the circuit in parallel. During operation, different spiral heating wires are controlled to pass different currents to ensure independent control of the heating temperature at each place. Here, the main method is to gradually increase the temperature. A high-temperature resistant heating film sleeve is sleeved outside the spiral heating wire. The high-temperature resistant heating film sleeve is beneficial to heat dissipation and installation. The high-temperature resistant heating film sleeve is installed on a foam block fixed on the foam block, and the upper layer of the foam block is connected to the fixed bracket through a foaming rubber block. Since both the foam block and the foaming rubber block have a heat preservation effect and the foaming rubber block is convenient for connection, the overall structure can be ensured to be integrated and convenient for installation. Here, the heating device is symmetrically arranged in two groups, upper and lower, so that the glass envelopes at the ends of the product can be close to the upper and lower high-temperature resistant heating film sleeves, and the heat dissipated from the periphery of the upper and lower high-temperature resistant heating film sleeves is used for melting.

[0004] Referring to the above patent document, existing encapsulation furnaces all use heating wires as the heat source to melt and form the glass envelope by using the heat generated by the heating wires. In order to facilitate the installation of the heating wires and better control the temperature, a high-temperature resistant heating film sleeve is sleeved on the outer periphery of the heating wires. The high-temperature resistant heating film sleeve and the foam block located outside it are fixed by bonding. This bonding fixing method is unreliable. After long-term use, the heating wire located above will fall off together with the high-temperature resistant heating film sleeve, thus causing damage to the product. In addition, the heating effect of the heating wire sleeved with the high-temperature resistant heating film sleeve on the glass envelope is poor. Since the glass envelope is horizontally placed passing outside the high-temperature resistant heating film sleeve, the temperature at the end of the glass envelope is too high, while the temperature in the middle of the glass envelope is too low, resulting in uneven heating of the entire glass envelope and poor forming effect.

[0005] In addition, for existing encapsulation furnaces, in order to prevent the heat of the heating wire from dissipating too quickly, a layer of foam or asbestos for heat preservation is wrapped around their outer periphery. However, whether it is foam or asbestos, fine dust and harmful gases are generated in a high-temperature environment, which are easily inhaled into the lungs and harmful to the human body. Summary of the Invention

[0006] The purpose of the present invention is to provide a thermistor encapsulation furnace aiming at the deficiencies in the prior art. Using this mold can solve the problems of uneven heating and easy falling of the heating wire.

[0007] The present application provides a thermistor encapsulation furnace, including a lower heat preservation block, on the top surface of which a lower groove is provided, and a lower installation channel is provided at the bottom of the lower groove; an upper heat preservation block, which is stacked on the lower heat preservation block, and an upper groove opposite to the lower groove is provided on the bottom surface of the upper heat preservation block, and an upper installation channel is provided at the bottom of the upper groove; a C-shaped pipe, which is fixedly installed in the cavity surrounded by the upper groove and the lower groove; an upper ceramic pipe, around the outer peripheral side of which a heating wire is wound, and at least two upper ceramic rings arranged at intervals along the length direction of the upper groove are sleeved on the outer peripheral side of the upper ceramic pipe, and each upper ceramic ring is clamped in the upper installation channel; a lower ceramic pipe, around the outer peripheral side of which a heating wire is wound, and at least two lower ceramic rings arranged at intervals along the length direction of the lower groove are sleeved on the outer peripheral side of the lower ceramic pipe, and each lower ceramic ring is clamped in the lower installation channel.

[0008] Among them, both the lower heat preservation block and the upper heat preservation block are mullite heat preservation bricks.

[0009] Among them, the upper installation channel includes an upper rectangular groove opened at the bottom of the upper groove and an upper circular groove opened at the bottom of the upper rectangular groove. The width of the upper rectangular groove is smaller than the diameter of the upper circular groove, and the diameter of the upper ceramic ring is larger than the width of the upper rectangular groove.

[0010] Among them, the lower installation channel includes a lower rectangular groove opened at the bottom of the lower groove and a lower circular groove opened at the bottom of the lower rectangular groove. The width of the lower rectangular groove is smaller than the diameter of the lower circular groove, and the diameter of the lower ceramic ring is larger than the width of the lower rectangular groove.

[0011] Among them, the cross-sectional shape of the upper groove and the cross-sectional shape of the lower groove are both semi-circular.

[0012] Among them, it further includes a housing, which includes a left side plate, a right side plate, an upper housing and a lower housing. Both the upper housing and the lower housing are U-shaped. The upper housing is buckled above the lower housing and the upper housing is fixedly connected to the lower housing through a connecting piece; the left side plate is located on the left side of the upper housing, one end of the left side plate is fixedly connected to the upper housing, and the other end is fixedly connected to the lower housing; the right side plate is located on the right side of the upper housing, one end of the right side plate is fixedly connected to the upper housing, and the other end is fixedly connected to the lower housing.

[0013] Among them, the connecting member is a connecting block. One end of the connecting block is fixedly connected to the back surface of the upper shell, and the other end is fixedly connected to the back surface of the lower shell.

[0014] Among them, wire grooves are formed on the bottom surface of the upper heat insulation block and the top surface of the lower heat insulation block.

[0015] Beneficial effects: Compared with the prior art, in a thermistor encapsulation furnace of this application, the heating wire is erected outside the C-shaped tube through the ceramic tube and the ceramic ring. That is to say, the heating wire is separated from the C-shaped tube by the ceramic ring. Even if the heating wire becomes loose or curved, it will not touch the C-shaped tube, avoiding the short circuit caused by the heating wire touching the C-shaped tube and enhancing safety. In addition, the heating wire is fixedly installed in the heat insulation block through the ceramic tube and the ceramic tube, and the installation is firm and reliable, solving the problem of unstable installation in the past. Moreover, the C-shaped tube is directly heated by the heating wire, and the C-shaped tube can heat the glass shell more evenly to form it, ensuring the product quality. In other solutions, the heat insulation block adopts mullite insulation bricks, whose heat insulation effect is more remarkable than that of asbestos or foam in the past. It is non-toxic, ensuring the health of workers, reducing energy consumption, lowering costs, and saving energy. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the thermistor encapsulation furnace in this embodiment.

[0017] Figure 2 It is an exploded view of the thermistor encapsulation furnace in this embodiment.

[0018] Figure 3 It is an exploded view of the outer shell in this embodiment.

[0019] Figure 4 It is a schematic structural diagram of the lower heat insulation block in this embodiment

[0020] Figure 5 It is a schematic structural diagram of the upper heat insulation block in this embodiment

[0021] Reference numerals: outer shell 1, upper shell 11, lower shell 12, left side plate 13, right side plate 14, connecting block 15, C-shaped tube 2, upper heat insulation block 31, upper ceramic tube 32, upper ceramic ring 33, lower heat insulation block 41, lower ceramic tube 42, lower ceramic ring 43, heating wire 5, upper groove 61, upper rectangular groove 62, upper circular groove 63, lower groove 71, lower rectangular groove 72, lower circular groove 73. Detailed Embodiments

[0022] To make the objectives, technical solutions, and advantages of this application clearer and more understandable, the embodiments of this application will be described in detail below with reference to the drawings. It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other arbitrarily.

[0023] A kind of thermistor packaging furnace of this embodiment, please refer to Figures 1 to 2 , which includes a housing 1, an upper heat preservation block 31, a lower heat preservation block 41, an upper ceramic tube 32, a lower sleeve measuring tube and a C-shaped tube 2.

[0024] Please refer to Figure 3 , the housing 1 includes a left side plate 13, a right side plate 14, an upper housing 11 and a lower housing 12. Both the upper housing 11 and the lower housing 12 are arranged in a U shape. The upper housing 11 is buckled above the lower housing 12 and the upper housing 11 is fixedly connected to the lower housing 12 through a connecting piece. In this embodiment, the connecting piece is a connecting block 15. One end of the connecting block 15 is fixedly connected to the back of the upper housing 11, and the other end is fixedly connected to the back of the lower housing 12. There is a notch between the front of the upper housing 11 and the front of the lower housing 12. This notch mainly enables the opening of the C-shaped tube 2 to be exposed outside the housing. The left side plate 13 is located on the left side of the upper housing 11. One end of the left side plate 13 is fixedly connected to the upper housing 11, and the other end is fixedly connected to the lower housing 12. Similarly, the right side plate 14 is located on the right side of the upper housing 11. One end of the right side plate 14 is fixedly connected to the upper housing 11, and the other end is fixedly connected to the lower housing 12. It should be noted that the fixed connection method can be through screws.

[0025] Furthermore, the upper heat preservation block 31 is placed in the upper housing 11, and the lower heat preservation block 41 is placed in the lower housing 12.

[0026] As an improvement, please refer to Figure 4 , a lower groove 71 is opened on the top surface of the lower heat preservation block 41, and a lower installation channel is opened at the bottom of the lower groove 71. Specifically, the lower installation channel includes a lower rectangular groove 72 opened at the bottom of the lower groove 71 and a lower circular groove 73 opened at the bottom of the lower rectangular groove 72. The groove width of the lower rectangular groove 72 is smaller than the diameter of the lower circular groove 73. The diameter of the lower ceramic ring 43 is larger than the groove width of the lower rectangular groove 72. A heating wire 5 is wound around the outer peripheral side of the lower ceramic tube 42, and at least two lower ceramic rings 43 are sleeved on the outer peripheral side of the lower ceramic tube 42 and are arranged at intervals along the length direction of the lower groove 71. Each lower ceramic ring 43 is clamped in the lower circular groove 73 of the lower installation channel.

[0027] Please refer to Figure 5, the upper heat-insulating block 31 is stacked on the lower heat-insulating block 41, and an upper groove 61 opposite to the lower groove 71 is formed on the bottom surface of the upper heat-insulating block 31. An upper installation channel is formed at the bottom of the upper groove 61. Specifically, the upper installation channel includes an upper rectangular groove 62 formed at the bottom of the upper groove 61 and an upper circular groove 63 formed at the bottom of the upper rectangular groove 62. The width of the upper rectangular groove 62 is smaller than the diameter of the upper circular groove 63, and the diameter of the upper ceramic ring 33 is larger than the width of the upper rectangular groove 62. A heating wire 5 is wound around the outer peripheral side of the upper ceramic tube 32, and at least two upper ceramic rings 33 are sleeved on the outer peripheral side of the upper ceramic tube 32 and arranged at intervals along the length direction of the upper groove 61. Each upper ceramic ring 33 is clamped in the upper circular groove 63 of the upper installation channel.

[0028] During installation, first, the ceramic rings are sleeved on the outer peripheral side of the ceramic tube and arranged at intervals along the axial direction of the ceramic tube, and then the whole ceramic tube is inserted into the circular groove of the heat-insulating brick. Since the diameter of the circular groove is larger than the width of the rectangular groove, and the diameter of the ceramic ring is larger than the width of the rectangular groove, the ceramic ring is clamped in the circular groove and will not fall out of the circular groove, so that the ceramic tube is suspended in the circular groove, providing sufficient space between the heating wire and the C-shaped tube 2. In a thermistor encapsulation furnace of this embodiment, the heating wire 5 is erected outside the C-shaped tube 2 through the ceramic tube and the ceramic ring, that is, the heating wire 5 is separated from the C-shaped tube 2 by the ceramic ring. Even if the heating wire 5 loosens or bends, it will not touch the C-shaped tube 2, avoiding short circuit caused by the heating wire 5 touching the C-shaped tube 2 and enhancing safety. In addition, the heating wire 5 is fixedly installed in the heat-insulating block through the ceramic tube and the ceramic tube, and the installation is firm and reliable, solving the problem of unstable installation in the past. In addition, the C-shaped tube 2 is directly heated by the heating wire 5, and the C-shaped tube 2 can be heated more evenly to form the glass shell, ensuring the product quality.

[0029] In this embodiment, the cross-sectional shapes of the upper groove 61 and the lower groove 71 are both semi-circular, and the C-shaped tube 2 is fixedly installed in the cavity surrounded by the upper groove 61 and the lower groove 71. As a preferred solution, both the lower heat-insulating block 41 and the upper heat-insulating block 31 are mullite heat-insulating bricks. Using mullite heat-insulating bricks for the heat-insulating block has a more significant heat-insulating effect than previous asbestos or foam, is non-toxic, ensuring the health of workers, reducing energy consumption, lowering costs, and saving energy.

[0030] In this embodiment, wire grooves are formed on the bottom surface of the upper heat-insulating block 31 and the top surface of the lower heat-insulating block 41. It should be noted that for the convenience of processing the heat-insulating block, the heat-insulating block can be formed by splicing multiple small heat-insulating blocks.

[0031] Although the embodiments disclosed in this application are as above, the content is only an embodiment adopted for the convenience of understanding this application and is not intended to limit this application. Any person skilled in the art within the technical field to which this application pertains may make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed in this application. However, the scope of patent protection of this application shall still be subject to the scope defined by the appended claims.

Claims

1. A thermistor encapsulation furnace, characterized in that, Including: A lower heat-insulating block, on the top surface of which a lower groove is provided, and a lower installation channel is provided at the bottom of the lower groove; An upper heat-insulating block, which is stacked on the lower heat-insulating block, and an upper groove opposite to the lower groove is provided on the bottom surface of the upper heat-insulating block, and an upper installation channel is provided at the bottom of the upper groove; A C-shaped pipe, which is fixedly installed in the cavity surrounded by the upper groove and the lower groove; An upper ceramic pipe, on the outer peripheral side of which a heating wire is wound, and at least two upper ceramic rings arranged at intervals along the length direction of the upper groove are sleeved on the outer peripheral side of the upper ceramic pipe, and each of the upper ceramic rings is clamped in the upper installation channel; A lower ceramic pipe, on the outer peripheral side of which a heating wire is wound, and at least two lower ceramic rings arranged at intervals along the length direction of the lower groove are sleeved on the outer peripheral side of the lower ceramic pipe, and each of the lower ceramic rings is clamped in the lower installation channel; The upper installation channel includes an upper rectangular groove provided at the bottom of the upper groove and an upper circular groove provided at the bottom of the upper rectangular groove. The groove width of the upper rectangular groove is smaller than the diameter of the upper circular groove, and the diameter of the upper ceramic ring is larger than the groove width of the upper rectangular groove; The lower installation channel includes a lower rectangular groove provided at the bottom of the lower groove and a lower circular groove provided at the bottom of the lower rectangular groove. The groove width of the lower rectangular groove is smaller than the diameter of the lower circular groove, and the diameter of the lower ceramic ring is larger than the groove width of the lower rectangular groove.

2. The thermistor encapsulation furnace according to claim 1, wherein: Both the lower heat-insulating block and the upper heat-insulating block are mullite heat-insulating bricks.

3. A thermistor encapsulation furnace according to claim 1, characterized in that: The cross-sectional shapes of both the upper groove and the lower groove are semi-circular.

4. A thermistor encapsulation furnace according to claim 1, characterized in that: It further includes a housing, which includes a left side plate, a right side plate, an upper housing and a lower housing. Both the upper housing and the lower housing are U-shaped. The upper housing is buckled above the lower housing and the upper housing is fixedly connected to the lower housing through a connecting piece; The left side plate is located on the left side of the upper housing. One end of the left side plate is fixedly connected to the upper housing, and the other end is fixedly connected to the lower housing; The right side plate is located on the right side of the upper housing. One end of the right side plate is fixedly connected to the upper housing, and the other end is fixedly connected to the lower housing.

5. A thermistor encapsulation furnace according to claim 4, characterized in that: The connecting piece is a connecting block. One end of the connecting block is fixedly connected to the back surface of the upper housing, and the other end is fixedly connected to the back surface of the lower housing.

6. A thermistor encapsulation furnace according to claim 1, characterized in that: Both the bottom surface of the upper heat-insulating block and the top surface of the lower heat-insulating block are provided with wire grooves.

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