Armored thermocouple and thermocouple support for denture sintering furnace

Abstract

The armored thermocouple comprises a ceramic protection tube, a ceramic partition, a thermocouple wire and a ceramic wiring portion, the ceramic protection tube is a cylindrical ceramic tube with one end provided with a round bottom seal, and the thermocouple wire is connected with the ceramic protection tube after the ceramic partition is inserted into the ceramic protection tube. Two groups of thermocouple wire channels with different communication parts are arranged in the ceramic protection tube, the two pairs of thermocouple wires are arranged in the two groups of channels in the ceramic protection tube, the ceramic wiring part is arranged at an opening of the ceramic protection tube, two groups of binding posts are arranged on the ceramic wiring part, and the two pairs of thermocouple wires are connected with the two groups of binding posts. According to the utility model, two-point temperature measurement can be carried out on the denture sintering furnace at the same time, the temperature field condition in the denture sintering furnace can be fully reflected, and the sheathed thermocouple is fixed on the denture sintering furnace.

Description

Technical Field

[0001] The utility model relates to the technical field of thermocouples, in particular to an armored thermocouple and a thermocouple bracket for a denture sintering furnace. Background Art

[0002] Denture sintering furnaces are used to sinter ceramic dentures. Traditional ceramic dentures are sintered at low temperatures, typically not exceeding 900°C. In recent years, the development of "zirconia all-ceramic fused to metal (PFM) dentures" has evolved. Mechanical scanners capture data from pre-prepared models of single crowns, opposing jaw models, and centric jaw occlusal models. Computer design and adjustments are then made to determine the appropriate single crown design for the individual. This design path is then saved as data for subsequent CNC machining. This entire process is computer-controlled, minimizing errors and ensuring accuracy and precision for aesthetic results. Zirconia all-ceramic fused to metal dentures are non-irritating to the gums and offer improved biocompatibility, without causing gum discoloration or inflammation. After sintering, zirconia ceramic is a translucent material, allowing dentures, especially anterior teeth, to have a certain degree of light transmittance, resulting in a more realistic appearance. Zirconia ceramic contains no metal, so it is not affected by MRI scans and does not require removal. Consequently, zirconia dentures have become widely used.

[0003] Since the sintering temperature of zirconium dioxide dentures exceeds 1400℃ and the temperature field in the sintering furnace must be uniform, many current temperature measurement devices in denture sintering furnaces are armored thermocouples with single-point temperature measurement. This cannot effectively reflect whether the temperature field in the denture sintering furnace is uniform, resulting in unstable quality of the sintered zirconium dioxide dentures. Utility Model Content

[0004] In view of this, the purpose of the present invention is to address the shortcomings of the existing technology and provide an armored thermocouple for a denture sintering furnace, which can simultaneously measure the temperature of the denture sintering furnace at two points and fully reflect the temperature field conditions inside the denture sintering furnace. A thermocouple bracket is also provided. Since the armored thermocouple of the present invention is fixed on the denture sintering furnace.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An armored thermocouple for a denture sintering furnace comprises a ceramic protective tube, a ceramic partition, thermocouple wires and a ceramic terminal portion. The ceramic protective tube is a cylindrical ceramic tube with a round bottom seal at one end. After the ceramic partition is inserted into the ceramic protective tube, the ceramic protective tube has two groups of thermocouple wire channels with different connection points. There are two pairs of thermocouple wires, which are placed in the two groups of channels in the ceramic protective tube. The ceramic terminal portion is arranged at the opening of the ceramic protective tube. Two groups of terminal posts are provided on the ceramic terminal portion. The two pairs of thermocouple wires are connected to the two groups of terminal posts.

[0007] Furthermore, the ceramic separator is a long plate or a cylindrical ceramic body with four grooves or through holes parallel to the axis. One of the connecting parts is located at the round bottom seal of the ceramic protective tube, and the other is a certain distance away from the round bottom seal. The spacing between the two connecting parts is 1-20 cm.

[0008] Furthermore, the ceramic connection portion is an integral ceramic connection portion or a split ceramic connection portion.

[0009] Furthermore, the ceramic wiring part is an integral ceramic wiring part, the ceramic wiring part is a ceramic sheet, the ceramic wiring part has a connecting hole, the connecting hole opening is in the center of the lower surface, the connecting hole is a blind hole, the openings of the four thermocouple wire holes are arranged on the lower surface, and two groups of terminal posts are arranged on both sides of the four thermocouple wire holes.

[0010] Furthermore, the ceramic wiring part is a split ceramic wiring part, including a lower ceramic sheet and an upper ceramic sheet. The ceramic wiring part has a connecting hole, which is arranged at the center of the lower ceramic sheet and is a through hole. The four thermocouple wire holes are arranged at the center of the upper ceramic sheet. The upper ceramic sheet is stacked on the lower ceramic sheet. The two thermocouple wire holes on the upper ceramic sheet lead to the connecting holes of the lower ceramic sheet. Two groups of terminal posts are arranged on both sides of the four thermocouple wire holes of the upper ceramic sheet.

[0011] Furthermore, the lower ceramic sheet and the upper ceramic sheet are bonded together using heat-resistant glue.

[0012] Furthermore, the ceramic protection tube and the ceramic partition are made of high thermal conductivity insulating ceramics capable of withstanding temperatures of 1400°C.

[0013] Furthermore, the thermocouple wire is one of R, B, and S type thermocouple wires.

[0014] A thermocouple bracket, which cooperates with the aforementioned armored thermocouple, includes a thermocouple bracket body, which is formed by stamping and bending a metal plate and is in an arch shape. A thermocouple through-hole is opened at the arch top of the thermocouple bracket body. The thermocouple bracket body has two parallel ear plates at the thermocouple through-hole, and the ear plates are provided with fastening holes. The fastening holes are internally threaded holes that can be screwed in with screws.

[0015] Furthermore, both ends of the thermocouple bracket body have foot plates, and limit baffles are provided on the foot plates. The limit baffles are integrated with the foot plates and are bent.

[0016] The utility model discloses an armored thermocouple for a denture sintering furnace, which is fixed on a thermocouple bracket. A ceramic protection tube of the thermocouple is passed through a thermocouple through-hole on a body of the thermocouple bracket, a ceramic wiring portion is placed between two ear plates, and after a fastening screw is screwed into the fastening hole, the ceramic wiring portion can be tightened to complete the fixation of the armored thermocouple on the thermocouple bracket.

[0017] During actual use, first fix the thermocouple bracket to the corresponding position of the denture sintering furnace, then install the armored thermocouple, and finally connect the temperature measuring cable.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model provides an armored thermocouple for a denture sintering furnace, which can realize two-point temperature measurement in the denture sintering furnace and fully understand the temperature field in the denture sintering furnace.

[0020] 2. The utility model also provides a thermocouple bracket for installing and fixing armored thermocouples, which has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the armored thermocouple of the present utility model.

[0022] Figure 2 This is a cross-sectional structural diagram of the armored thermocouple of the present utility model.

[0023] Figure 3 This is a schematic cross-sectional view of the ceramic protection tube of the armored thermocouple of the present invention.

[0024] Figure 4 This is a schematic structural diagram of the thermocouple bracket of the utility model.

[0025] Figure 5 This is a schematic diagram of the thermocouple bracket on which the armored thermocouple of the utility model is installed.

[0026] In the figure: 11, ceramic protective tube; 12, ceramic partition; 13, channel; 14, thermocouple wire; 15, ceramic connection part; 15A, lower ceramic plate; 15B, upper ceramic plate; 16, connecting hole; 17, thermocouple wire hole; 18, terminal; 21, thermocouple bracket body; 22, thermocouple through hole; 23, ear plate; 24, fastening hole; 25, foot plate; 26, limit baffle. DETAILED DESCRIPTION

[0027] The present application is further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail. They can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0028] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various implementations, and the operational steps involved in each embodiment may be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a particular embodiment and do not imply a required composition and / or sequence.

[0029] Component numbers used herein, such as "first" and "second," are used solely to distinguish the components being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). Example

[0030] like Figure 1 、 Figure 2 and Figure 3 As shown, an armored thermocouple for a denture sintering furnace includes a ceramic protection tube 11, a ceramic partition 12, a thermocouple wire 14, and a ceramic connection portion 15. The ceramic protection tube 11 is a cylindrical ceramic tube with a round bottom seal at one end, made of silicon carbide ceramic, and can be used at a high temperature of 1600°C for a long time. The outer diameter is 6 mm and the inner diameter is 4.4 mm. The ceramic partition 12 is a cylindrical ceramic body with four circular through-holes forming a channel 13, made of 99.9% alumina ceramic, with an outer diameter of 4.3 mm. Two of the four channels 13 are at a distance of 1 / 4 in. It is connected at a position 4 cm away from the end, and the connected portion is set on the surface of the ceramic partition 12. Four thermocouple wires 14 are passed through the four channels 13 to form two pairs of thermocouples. The thermocouples can be S-type thermocouples of platinum-rhodium 10-platinum, wherein one pair of thermocouple wires 14 are connected at one end of the ceramic partition 12, and the other pair of thermocouple wires 14 are connected at the connected portion 4 cm away from the end. Then, the ceramic partition 12 equipped with two pairs of thermocouple wires 14 is inserted into the ceramic protective tube 11, and the pair of hot spot wires connected at one end are placed at the round bottom seal of the ceramic protective tube 11.

[0031] The ceramic terminal block 15 is a split-type ceramic terminal block, comprising a lower ceramic plate 15A and an upper ceramic plate 15B. The connection hole 16 is located at the center of the lower ceramic plate 15A and is a through-hole. The ceramic protective tube 11 is inserted into the connection hole 16. Four holes for thermocouple wires 17 are located at the center of the upper ceramic plate 15B. Two pairs of thermocouple wires 14 pass through the four holes 17 of the upper ceramic plate 15B. The upper ceramic plate 15B is stacked on the lower ceramic plate 15A. Heat-resistant adhesive is applied between the upper and lower ceramic plates 15B and within the connection holes 16 of the lower ceramic plate 15A. After curing, the upper and lower ceramic plates 15B and the ceramic protective tube 11 are bonded together, forming a single unit. The upper ceramic plate 15B has two sets of terminal blocks 18 on either side of the four holes 17, each of which connects to a respective set of thermocouple wires 14.

[0032] like Figure 4 As shown, a thermocouple bracket includes a thermocouple bracket body 21, which is formed by stamping and bending stainless steel with a thickness of 2 mm and an I-shaped shape. The upper and lower horizontal parts of the I-shaped bracket serve as foot plates 25, and one vertical part of the I-shaped bracket is stamped and bent into an arch shape. A thermocouple through-hole 22 is formed at the top of the arch of the thermocouple bracket body 21. The thermocouple bracket body 21 has two parallel ear plates 23 at the thermocouple through-hole 22. The ear plates 23 are provided with fastening holes 24. The fastening holes 24 are internally threaded holes that can be screwed in with screws. A limit baffle 26 is provided on the foot plate 25. The limit baffle 26 is integrated with the foot plate 25 and is bent.

[0033] like Figure 5 As shown, a schematic diagram of an armored thermocouple for a denture sintering furnace of the present invention is placed on a thermocouple bracket. In order to fix the armored thermocouple on the thermocouple bracket, a screw is screwed into the fastening hole 24 and pressed against the ceramic wiring part 15, thereby achieving the fixation of the armored thermocouple on the thermocouple bracket.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. An armored thermocouple for a denture sintering furnace, characterized by: The invention comprises a ceramic protective tube, a ceramic partition, a thermocouple wire and a ceramic wiring part. The ceramic protective tube is a cylindrical ceramic tube with a round bottom seal at one end. After the ceramic partition is inserted into the ceramic protective tube, the ceramic protective tube has two groups of thermocouple wire channels with different connection parts. There are two pairs of thermocouple wires, which are placed in the two groups of channels in the ceramic protective tube. The ceramic wiring part is arranged at the opening of the ceramic protective tube. Two groups of terminal posts are provided on the ceramic wiring part. The two pairs of thermocouple wires are connected to the two groups of terminal posts.

2. The armored thermocouple for a denture sintering furnace according to claim 1, characterized in that: The ceramic partition is a long plate or a cylindrical ceramic body with four grooves or through holes parallel to the axis. One of the connecting parts is located at the round bottom seal of the ceramic protective tube, and the other is a certain distance away from the round bottom seal. The spacing between the two connecting parts is 1-20 cm.

3. The armored thermocouple for a denture sintering furnace according to claim 1, characterized in that: The ceramic connection part is an integral ceramic connection part or a split ceramic connection part.

4. The armored thermocouple for a denture sintering furnace according to claim 3, characterized in that: The ceramic wiring part is an integral ceramic wiring part, which is a ceramic sheet. The ceramic wiring part has a connecting hole, which opens at the center of the lower surface and is a blind hole. The openings of the four thermocouple wire holes are arranged on the lower surface, and two groups of terminal posts are arranged on both sides of the four thermocouple wire holes.

5. The armored thermocouple for a denture sintering furnace according to claim 3, characterized in that: The ceramic wiring part is a split ceramic wiring part, including a lower ceramic sheet and an upper ceramic sheet. The ceramic wiring part has a connecting hole, which is a through hole arranged at the center of the lower ceramic sheet. The four thermocouple wire holes are arranged at the center of the upper ceramic sheet. The upper ceramic sheet is stacked on the lower ceramic sheet. The two thermocouple wire holes on the upper ceramic sheet lead to the connecting holes of the lower ceramic sheet. Two groups of terminal posts are arranged on both sides of the four thermocouple wire holes of the upper ceramic sheet.

6. The armored thermocouple for a denture sintering furnace according to claim 5, characterized in that: The lower ceramic sheet and the upper ceramic sheet are bonded together using heat-resistant glue.

7. The armored thermocouple for a denture sintering furnace according to claim 1, characterized in that: The ceramic protection tube and the ceramic partition are made of high-thermal-conducting insulating ceramics capable of withstanding temperatures of 1400°C.

8. The armored thermocouple for a denture sintering furnace according to claim 1, characterized in that: The thermocouple wire is one of R, B, and S type thermocouple wires.

9. A thermocouple holder, adapted for use with an armored thermocouple for a denture sintering furnace as claimed in any one of claims 1 to 8, characterized in that: The thermocouple bracket body includes a thermocouple bracket body, which is formed by stamping and bending a metal plate and is in an arch shape. A thermocouple through-hole is opened on the arched top of the thermocouple bracket body. The thermocouple bracket body has two parallel ear plates at the thermocouple through-hole. The ear plates are provided with fastening holes. The fastening holes are internal threaded holes that can be screwed in with screws.

10. The thermocouple bracket according to claim 9, characterized in that: Both ends of the thermocouple bracket body are provided with foot plates, and the foot plates are provided with limit baffles, which are integrated with the foot plates and are formed by bending.

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