Vacuum porcelain baking furnace

Abstract

According to one aspect of the application, a furnace body comprises an outer furnace cylinder, an inner furnace cylinder, a furnace lining, a furnace top cover and a furnace bottom cover, the outer furnace cylinder is not provided with a cylinder bottom, the inner furnace cylinder is provided with a cylinder bottom, a hearth is arranged in the middle of the furnace lining, the furnace lining is placed in the inner furnace cylinder and is in close contact with the inner furnace cylinder, and the furnace bottom cover is arranged on the furnace top cover. The inner furnace barrel is sleeved in the outer furnace barrel, a gap is formed between the inner furnace barrel and the outer furnace barrel, the inner furnace barrel is arranged on the furnace top cover in a non-sealing manner, a gap is formed between the furnace lining and the furnace top cover, the outer furnace barrel is arranged on the furnace top cover and the furnace bottom cover in a sealing manner, and a gas nozzle for vacuumizing is arranged on the side wall of the outer furnace barrel. According to the utility model, the periphery of the furnace lining is directly or indirectly separated from the outer furnace cylinder and is also in a vacuum state after being vacuumized, the vacuum thermal conductivity is very low, and the temperature of the shell is slightly higher than the room temperature in the false tooth porcelain baking process, so that the surrounding working environment of the vacuum porcelain baking furnace during working is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of denture porcelain furnaces, in particular to a vacuum porcelain furnace for denture porcelain firing. Background Technique

[0002] Porcelain firing is a dental technology, generally called porcelain teeth. This kind of restoration has the advantages of high strength of metal, beauty of porcelain, vividness of teeth, and wear resistance. For the restoration of missing anterior and posterior teeth, it can achieve the ideal functions and forms of missing teeth restoration. It can improve pronunciation, and make the restoration harmonious with adjacent teeth, lips, occlusion, and facial shape, giving oneself and others a complete and harmonious aesthetic feeling. In addition to restoring missing teeth, this technology can also be used to restore discolored, fluorotic, enamel hypoplastic, conical and partially defective anterior teeth. For the situation where the tooth shape cannot be restored after repairing large-area defects of posterior teeth, the original appearance of the teeth can also be restored through this porcelain teeth technology.

[0003] The commonly used sintering equipment for denture porcelain firing is a vacuum porcelain furnace. Existing vacuum porcelain furnaces, such as a vacuum porcelain furnace for dentures disclosed in a Chinese patent with the application number CN201821454880.X on May 17, 2019, and another vacuum porcelain furnace disclosed in a Chinese patent with the application number CN201921179139.1 on May 5, 2020. During the porcelain firing process of dentures by the vacuum porcelain furnaces described in these patents, the surface temperature of the furnace body is relatively high, and the staff standing beside the furnace has a strong sense of fumigation, making the working environment relatively harsh.

[0004] Therefore, there is a need for a vacuum porcelain furnace with a low furnace body temperature during the sintering process to improve the working environment of the staff. Content of the Utility Model

[0005] The present application provides a vacuum porcelain furnace. There is a space directly or indirectly separated from the outer furnace cylinder around the furnace lining. After being evacuated, it is also in a vacuum state. The thermal conductivity of the vacuum is very low. During the porcelain firing process of dentures, the temperature of the outer shell is slightly higher than the room temperature, greatly improving the working environment around the vacuum porcelain furnace during operation.

[0006] According to one aspect of the present application, a vacuum porcelain furnace provided in an embodiment includes a workbench. A furnace body frame is arranged at the rear side of the workbench. The furnace body frame is provided with a furnace body above the workbench. The furnace mouth of the furnace body faces downward. A lifting device is arranged on the furnace body frame. A furnace door is arranged between the workbench and the furnace body on the lifting device.

[0007] The furnace body includes an outer furnace cylinder, an inner furnace cylinder, a furnace lining, a furnace top cover, and a furnace bottom cover. The outer furnace cylinder has no bottom, and the inner furnace cylinder has a bottom. The middle of the furnace lining is a furnace chamber. The furnace lining is placed in the inner furnace cylinder and is in close contact with the inner furnace cylinder. The inner furnace cylinder is sleeved in the outer furnace cylinder, and there is a gap between the inner furnace cylinder and the outer furnace cylinder and they do not contact each other. The inner furnace cylinder is non-sealed and arranged on the furnace top cover, and there is a gap between the furnace lining and the furnace top cover and they do not contact each other. The outer furnace cylinder is sealed and arranged on the furnace top cover and the furnace bottom cover, and a nozzle for vacuum extraction is arranged on the side wall of the outer furnace cylinder.

[0008] In some embodiments, the inner wall of the outer furnace cylinder is polished.

[0009] In some embodiments, an electric heating element is arranged in the furnace lining, and both ends of the electric heating element pass through the furnace top cover to connect to an external power supply.

[0010] In some embodiments, a thermocouple is arranged on the furnace top cover, and the thermocouple is inserted into the furnace chamber.

[0011] In some embodiments, a furnace body cover is arranged around the furnace body to cover the furnace body.

[0012] In some embodiments, the furnace door includes a furnace door cover and a furnace door platform. The furnace door platform is a stepped furnace door platform with at least one step, and the furnace door platform is arranged on the furnace door cover.

[0013] In some embodiments, the size of the furnace door cover is larger than that of the furnace door platform, and a sealing ring is arranged on the furnace door cover. The sealing ring and the furnace door platform are located on the upper side of the furnace door cover.

[0014] According to a vacuum porcelain furnace of the above embodiments, the furnace lining is located in the inner furnace cylinder and there are gaps between it and the outer furnace cylinder, the furnace top cover, and the furnace bottom cover. During porcelain firing under vacuum, these are also in a vacuum state, and the heat conduction of vacuum is very low. Therefore, it is very difficult for the heat in the vacuum furnace to conduct to the surface of the furnace body, so the surface temperature of the furnace body is only slightly higher than room temperature. In the process of denture porcelain firing, even if the staff stands next to the vacuum porcelain furnace to work, there will be no feeling of being fumigated, which improves the working environment of the staff.

[0015] According to a vacuum porcelain furnace of the above embodiments, the inner wall of the outer furnace cylinder is polished to reflect through separate thermal radiation, further improving the heat insulation effect.

[0016] The beneficial effects of the present utility model are:

[0017] 1. A vacuum porcelain furnace according to the above embodiments. When evacuating the vacuum, the space between the inner furnace cylinder and the outer furnace cylinder and the furnace lining and the furnace top cover will also be evacuated. Since the thermal conductivity is very poor under vacuum, it is very difficult for the temperature inside the vacuum porcelain furnace to be conducted to the surface of the furnace body. Therefore, the surface temperature of the furnace body is low.

[0018] 2. A vacuum porcelain furnace according to the above embodiments. Since the vacuum insulation effect is good, the heat dissipated in the furnace chamber is also less. When sintering the same dentures, the power consumption is less than that of the existing vacuum porcelain furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram of the present utility model;

[0020] Figure 2 is a sectional structure diagram of the present utility model.

[0021] In the figure: 1, workbench; 2, furnace body frame; 3, furnace body; 31, outer furnace cylinder; 32, inner furnace cylinder; 33, furnace lining; 34, furnace top cover;; 35, furnace bottom cover; 36, electric heating element; 4, furnace door; 41, furnace door cover; 42, furnace door platform; 43, sealing ring; 5, furnace body cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present application will be further described in detail below in conjunction with the drawings through specific embodiments. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can 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, which is to avoid the core part 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, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the field.

[0023] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various embodiments, and the operation steps involved in each embodiment can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the specification and the drawings are only for clearly describing a certain embodiment, and do not mean that they are essential components and / or sequences.

[0024] The serial numbers assigned to components in this text, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling).

[0025] Embodiment:

[0026] Please refer to Figure 1 and Figure 2 According to one aspect of the present application, a vacuum porcelain furnace provided in an embodiment includes a workbench 1. A control device of the vacuum porcelain furnace is provided inside the workbench 1. A control display screen is provided on the front side of the workbench 1, and the control display screen is a touch screen.

[0027] A furnace body frame 2 is provided on the rear side of the workbench 1, and a furnace body 3 is provided above the workbench 1 on the upper part of the furnace body frame 2.

[0028] The furnace body frame 2 is hollow inside and is provided with a lifting device. A vertical long hole is provided on the front side of the furnace body frame 2. A cantilever is provided on the lifting device, and the cantilever extends out of the long hole. A furnace door 4 is provided on the cantilever, and the furnace door 4 is located between the workbench 1 and the furnace body 3.

[0029] The furnace door 4 includes a furnace door cover 41 and a furnace door platform 42. The furnace door cover 41 is made of stainless steel, and the furnace door platform 42 is made of zirconia refractory material. Vessels are placed on the top of the furnace door platform 42, and dentures are placed on the vessels. The furnace door platform 42 is a stepped furnace door platform and is provided with at least one step. The furnace door platform 42 is provided on the furnace door cover 41. The size of the furnace door cover 41 is larger than that of the furnace door platform 42. A sealing ring 43 is provided on the furnace door cover 41, and the sealing ring 43 and the furnace door platform 42 are located on the upper side of the furnace door cover 41.

[0030] The hearth opening of the furnace body 3 faces downward.

[0031] The furnace body 3 includes an outer furnace barrel 31, an inner furnace barrel 32, a furnace lining 33, a furnace top cover 34 and a furnace bottom cover 35. The outer furnace barrel 31 is made of stainless steel and has no bottom. The inner wall of the outer furnace barrel 31 is polished. The inner furnace barrel 32 is also made of stainless steel and has a bottom. The furnace lining 33 is made of zirconia porous refractory material. The furnace top cover 34 and the furnace bottom cover 35 are both made of aluminum plates. The middle of the furnace lining 33 is a furnace chamber. The furnace lining 33 is placed in the inner furnace barrel 32 and is connected to the inner furnace barrel 32. In close contact, the inner furnace drum 32 is sleeved in the outer furnace drum 31, there is a gap between the inner furnace drum 32 and the outer furnace drum 31, they do not contact each other, the distance of the gap is greater than 2mm, the inner furnace drum 32 is non-sealed and arranged on the furnace top cover 34, there is a gap between the furnace lining 33 and the furnace top cover 34, they do not contact each other, the distance of the gap is greater than 5mm, the outer furnace drum 31 is sealed and arranged on the furnace top cover 34 and the furnace bottom cover 35, and a gas nozzle for vacuuming is arranged on the side wall of the outer furnace drum 31, and the pipeline connected to the gas nozzle passes through the inside of the furnace body frame 2.

[0032] An electric heating element 36 is arranged in the furnace lining 33, and both ends of the electric heating element 36 pass through the furnace top cover 34 to connect to an external power supply. The electric heating element 36 is an electric heating wire, specifically an iron-aluminum alloy electric heating wire. In this embodiment, the electric heating wire is passed through an annular tube for protecting the electric heating wire. The annular tube is a high-temperature resistant ceramic tube. A thermocouple is arranged on the furnace top cover 34, and the thermocouple is inserted into the furnace.

[0033] A furnace cover 5 is arranged around the furnace body 3 on the furnace body frame 2 to surround the furnace body 3 and make the vacuum porcelain furnace more beautiful.

[0034] The utility model provides a vacuum porcelain baking furnace. When in use, the artificial tooth to be baked is first placed on a vessel, and then the vessel is placed on a furnace door platform of the furnace door. Then the lifting device is controlled to drive the furnace door to rise, and the furnace door is closed so that the artificial tooth is located in the furnace chamber. After the furnace door is closed, the sealing ring on the furnace door cover is pressed on the outer furnace barrel by the furnace door cover to achieve the sealing of the furnace door. The furnace lining and the furnace door platform form a sealed furnace chamber, and the furnace lining is directly or indirectly separated from the outer furnace barrel, the furnace top cover and the furnace bottom cover through a gap. After vacuuming, a vacuum layer is formed, and the thermal conductivity is very low. Therefore, the temperature inside the furnace chamber is difficult to be transmitted to the surface of the furnace body, so that the temperature on the surface of the furnace body is only slightly higher than the room temperature, and no fumigation feeling occurs.

[0035] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. A vacuum porcelain furnace, characterized in that: The utility model comprises a workbench, a furnace frame is arranged at the rear side of the workbench, a furnace body is arranged on the upper part of the workbench, a furnace opening of the furnace body faces downward, a lifting device is arranged on the furnace frame, and a furnace door is arranged on the lifting device between the workbench and the furnace body; The furnace body includes an outer furnace barrel, an inner furnace barrel, a furnace lining, a furnace top cover and a furnace bottom cover. The outer furnace barrel has no bottom, while the inner furnace barrel has a bottom. The middle of the furnace lining is a furnace chamber. The furnace lining is placed in the inner furnace barrel and is in close contact with the inner furnace barrel. The inner furnace barrel is sleeved in the outer furnace barrel. There is a gap between the inner furnace barrel and the outer furnace barrel, and they do not contact each other. The inner furnace barrel is non-sealed and arranged on the furnace top cover. There is a gap between the furnace lining and the furnace top cover, and they do not contact each other. The outer furnace barrel is sealed and arranged on the furnace top cover and the furnace bottom cover. An air nozzle for vacuuming is arranged on the side wall of the outer furnace barrel.

2. A vacuum porcelain furnace according to claim 1, characterized in that: The inner wall of the outer furnace tube is polished.

3. A vacuum porcelain furnace according to claim 1, characterized in that: An electric heating element is arranged in the furnace lining, and two ends of the electric heating element pass through the furnace top cover to connect to an external power source.

4. A vacuum porcelain furnace according to claim 1, characterized in that: The furnace top cover is provided with a thermocouple, which is inserted into the furnace.

5. The vacuum porcelain furnace according to claim 1, characterized in that: The furnace body frame is provided with a furnace body cover around the furnace body.

6. A vacuum porcelain furnace according to claim 1, characterized in that: The furnace door comprises a furnace door cover and a furnace door platform. The furnace door platform is a step-shaped furnace door platform provided with at least one step. The furnace door platform is arranged on the furnace door cover.

7. A vacuum porcelain furnace according to claim 6, characterized in that: The size of the furnace door cover is larger than that of the furnace door platform. A sealing ring is arranged on the furnace door cover. The sealing ring and the furnace door platform are located on the upper side of the furnace door cover.

Images