A high temperature muffle

Abstract

The utility model discloses a high temperature muffle furnace, the utility model relates to muffle furnace technical field. This high temperature muffle furnace includes the shell, the inside of shell is provided with heating mechanism for heating material, heating mechanism includes: heat conduction subassembly, including fixedly installed in the shell inside outer temperature insulation layer, the inside of outer temperature insulation layer is provided with inner temperature insulation layer, the inside of inner temperature insulation layer is provided with limit pipe, and water inlet pipe continuously transports cooling medium to circulating pipe, and the circulating pipe of double helix structure can fully cover each area of furnace cover, especially high temperature conduction key position of furnace cover and fixed pipe, hearth contact, ensure cooling medium and furnace cover full contact to absorb heat, and the cooling medium after absorbing heat is discharged in time through drain pipe, avoids the heat accumulation in the inside of furnace cover. Through the active cooling of cooling circulation and the passive heat insulation cooperation of sealing structure, effectively prevent the furnace cover from obvious temperature rise after heating.

Description

Technical Field

[0001] This utility model relates to the field of muffle furnace technology, specifically a high-temperature muffle furnace. Background Technology

[0002] A muffle furnace (also known as a box-type resistance furnace or high-temperature furnace) is a device that provides a controllable high-temperature environment through electric heating elements for processes such as material heating, sintering, annealing, and ashing. It is widely used in laboratories and industrial production.

[0003] The existing utility model patent with publication number CN220169922U discloses a muffle furnace, including a furnace body with a heating chamber inside. A furnace door, sealable to the heating chamber, is located on the front side of the furnace body. A movable shelf is located within the heating chamber. Movable compartments are located on both the left and right sides of the heating chamber within the furnace body. Each movable compartment is vertically separated from the heating chamber by a partition. Each partition has a connecting slot corresponding to the shelf. The left and right ends of the shelf are inserted into the corresponding connecting slots, and both ends are located within the corresponding movable compartments and connected to a moving unit. The advantages of this utility model are: by providing a movable shelf within the heating chamber, and controlling its smooth forward and backward movement via a moving unit, it effectively avoids burns to operators when handling heated items within the heating chamber due to the high temperature; it also effectively improves the safety and comfort of using the muffle furnace.

[0004] The heating chamber and motor compartment of the muffle furnace are separated only by a single-layer partition with a "connecting slot". The high temperature of the heating chamber will seep into the motor compartment through heat conduction and heat radiation, causing the grease in the gear rack to fail at high temperatures, and thermal expansion and contraction, resulting in increased meshing resistance, jamming, and even wear on the gear surface. At the same time, the motor in the motor compartment is in a medium-high temperature environment for a long time, which will accelerate the aging of the motor insulation layer, trigger the motor overheat protection, shorten its lifespan, and in extreme cases, cause the motor to burn out. In addition, the heat inside the heating chamber will also be conducted to the furnace lid, causing the furnace lid to heat up. When the furnace lid is opened after heating is completed, the user may be burned. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a high-temperature muffle furnace that solves the problems of the furnace lid heating up after heating is completed and the transmission structure being damaged by high temperatures.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A high-temperature muffle furnace includes an outer shell, and a heating mechanism is disposed inside the outer shell for heating materials. The heating mechanism includes: A heat-conducting component includes an outer insulation layer fixedly installed inside a housing, an inner insulation layer inside the outer insulation layer, a limiting tube inside the inner insulation layer, a furnace chamber fitted inside the limiting tube, a fixing tube fixedly installed at the front end of the furnace chamber, a resistance wire fitted inside the inner wall of the limiting tube, a thermocouple fixedly installed at the rear end of the housing, a control board fixedly installed at the front end of the housing, a shelf fitted inside the fixing tube, connecting blocks fixedly installed on both sides of the front end of the shelf, and an electric push rod connected to the rear side of the connecting blocks. A sealing assembly, located at the front end of the limiting tube, is used to seal the furnace chamber.

[0007] Preferably, the sealing assembly includes a furnace cover movably mounted on the front end of the fixed pipe, a circulation pipe fixedly installed inside the furnace cover, an inlet pipe and a drain pipe respectively installed at both ends of the circulation pipe, a wing nut provided on the front side of the furnace cover, and a handle fixedly mounted on the front side of the furnace cover.

[0008] Preferably, the outer insulation layer is made of multiple asbestos boards spliced ​​together and fills the inner cavity of the outer shell. The inner insulation layer fills the gap between the outer insulation layer and the furnace. The limiting tube is a split structure. The rear end of the fixing tube is fixedly connected to the limiting tube. The front end of the fixing tube is provided with a threaded post. The resistance wire does not contact the furnace.

[0009] Preferably, the thermocouple penetrates the outer shell, the outer insulation layer, and the front end of the inner insulation layer is located behind the fixed tube. The shelf and the furnace are connected in a sliding manner. The shelf is half-cylindrical. Columnar structures are provided on both sides of the front end of the shelf. The connecting block is fixedly installed at the end of the columnar structure at the front end of the shelf. Recesses that fit into the columnar structure of the shelf are provided on both sides of the front end of the fixed tube. The electric push rod is fixedly connected to the outer shell.

[0010] Preferably, the rear ends of the furnace cover are provided with recesses on both sides that fit into the columnar structure of the shelf, and the furnace cover is installed at the front end of the fixing tube by a threaded post at the front end of the fixing tube and a wing nut.

[0011] Preferably, there are two circulation pipes, which are symmetrically installed inside the furnace cover and form a double helix structure. The outer end of the circulation pipe is fixedly connected to the water inlet pipe, and the inner end is fixedly connected to the drain pipe.

[0012] Beneficial effects This invention provides a high-temperature muffle furnace. Compared with the prior art, it has the following advantages: (1) During the heating process of this high-temperature muffle furnace, the double-helix circulation pipe inside the furnace cover forms a continuous cooling cycle with the water inlet pipe and the drain pipe: the water inlet pipe continuously supplies cooling medium to the circulation pipe, and the double-helix structure of the circulation pipe can fully cover all areas of the furnace cover, especially the key high-temperature conduction parts where the furnace cover contacts the fixed pipe and the furnace chamber, ensuring that the cooling medium is in full contact with the furnace cover to absorb heat; the cooling medium after absorbing heat is discharged in time through the drain pipe to avoid heat accumulation inside the furnace cover. Through the active cooling of the cooling cycle and the passive heat insulation of the sealing structure, the furnace cover is effectively prevented from heating up significantly after heating is completed.

[0013] (2) The high-temperature muffle furnace has a double insulation system consisting of an outer insulation layer and an inner insulation layer: the outer insulation layer fills the inner cavity of the outer shell, and the inner insulation layer fills the gap between the outer insulation layer and the furnace chamber, which can significantly block the high temperature inside the furnace chamber from being conducted outward, and prevent the high temperature from directly acting on the transmission structure; secondly, the structural design of the shelf is coordinated with the fixing pipe and the furnace cover: the shelf is half a cylindrical shape, and its front columnar structure fits into the recess of the fixing pipe and the furnace cover, which not only ensures the sliding stability of the shelf, but also reduces the transmission of the high temperature in the furnace chamber to the connecting block and the electric push rod through structural shielding; in addition, the electric push rod is fixedly installed on the outer shell, in a position far away from the high temperature core area of ​​the furnace chamber, and with the protection of the double insulation layer, the electric push rod, connecting block and other transmission components will not be in a medium and high temperature environment for a long time, avoiding problems such as grease failure, jamming and wear caused by thermal expansion and contraction of components, and aging of the motor insulation layer, thereby protecting the transmission structure from high temperature damage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the furnace installation structure of this utility model; Figure 3 This is a schematic diagram of the installation structure of the shelf of this utility model; Figure 4 This is a schematic diagram of the installation structure of the circulation pipe of this utility model; In the diagram: 1. Outer shell; 2. Heating mechanism; 21. Heat-conducting component; 211. Outer insulation layer; 212. Inner insulation layer; 213. Limiting tube; 214. Furnace chamber; 215. Fixing tube; 216. Resistance wire; 217. Thermocouple; 218. Control board; 219. Shelf; 2110. Connecting block; 2111. Electric push rod; 22. Sealing component; 221. Furnace cover; 222. Circulation pipe; 223. Water inlet pipe; 224. Drain pipe; 225. Wing nut; 226. Handle. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4 This utility model provides a technical solution: a high-temperature muffle furnace includes an outer shell 1, and a heating mechanism 2 is provided inside the outer shell 1 for heating materials. The heating mechanism 2 includes: a heat-conducting component 21, including an outer insulation layer 211 fixedly installed inside the outer shell 1, an inner insulation layer 212 provided inside the outer insulation layer 211, a limiting tube 213 provided inside the inner insulation layer 212, a furnace chamber 214 fitted inside the limiting tube 213, a fixing tube 215 fixedly installed at the front end of the furnace chamber 214, a resistance wire 216 fitted inside the inner wall of the limiting tube 213, a thermocouple 217 fixedly installed at the rear end of the outer shell 1, a control board 218 fixedly installed at the front end of the outer shell 1, a shelf 219 fitted inside the fixing tube 215, connecting blocks 2110 fixedly installed on both sides of the front end of the shelf 219, and an electric push rod 2111 connected to the rear side of the connecting block 2110. The outer insulation layer 211 is composed of multiple asbestos boards spliced ​​together, filling the inner cavity of the outer shell 1. The inner insulation layer 212 fills the gap between the outer insulation layer 211 and the furnace chamber 214. The limiting tube 213 has a split structure. The rear end of the fixing tube 215 is fixedly connected to the limiting tube 213. The front end of the fixing tube 215 is provided with a threaded post. The resistance wire 216 does not contact the furnace chamber 214. The thermocouple 217 passes through the outer shell 1, the outer insulation layer 211, and the inner insulation layer 214. The front end of 12 is located behind the fixed tube 215. The shelf 219 and the furnace 214 are connected in a sliding manner. The shelf 219 is a half-cylinder shape. The two sides of the front end of the shelf 219 are provided with columnar structures. The connecting block 2110 is fixedly installed at the end of the columnar structure at the front end of the shelf 219. The two sides of the front end of the fixed tube 215 are provided with recesses that fit into the columnar structure of the shelf 219. The electric push rod 2111 is fixedly connected to the outer shell 1.

[0017] Specifically, the inner insulation layer 212 is made of aluminum silicate fiber cotton, which is resistant to high temperatures and has good thermal insulation properties. It can work together with the outer insulation layer 211 made of asbestos to provide thermal insulation. The limiting tube 213 is divided into a sleeve structure at the front and rear ends and a symmetrical half-tubular structure component at the center. The material is silicon carbide ceramic. The split structure facilitates the installation of the resistance wire 216 and restricts the position of the furnace chamber 214. The furnace chamber 214 is an integrally formed cylindrical ceramic fiber. The thermocouple 217 can monitor the temperature of the furnace chamber 214. The shelf 219 is made of ceramic fiber, which facilitates heat conduction and restricts the position of materials. The position of the shelf 219 can be adjusted by extending and retracting the electric push rods 2111 on both sides to facilitate the placement and removal of materials.

[0018] The sealing assembly 22 is located at the front end of the limiting tube 213 to seal the furnace chamber 214. The sealing assembly 22 includes a furnace cover 221 movably installed at the front end of the fixed tube 215. A circulation tube 222 is fixedly installed inside the furnace cover 221. A water inlet pipe 223 and a drain pipe 224 are respectively installed at both ends of the circulation tube 222. A wing nut 225 is provided on the front side of the furnace cover 221. A handle 226 is fixedly installed on the front side of the furnace cover 221. The rear ends of the furnace cover 221 have recesses on both sides that fit into the columnar structure of the shelf 219. The furnace cover 221 is installed at the front end of the fixed tube 215 through the threaded post at the front end of the fixed tube 215 and the wing nut 225. There are two circulation tubes 222, which are symmetrically installed inside the furnace cover 221 and form a double helix structure. The outer end of the circulation tube 222 is fixedly connected to the water inlet pipe 223, and the inner end is fixedly connected to the drain pipe 224.

[0019] Specifically, the furnace cover 221 can seal the front end of the furnace chamber 214 to reduce heat loss. Cooling medium is introduced into the circulation pipe 222 inside the furnace cover 221 through the water inlet pipe 223 to absorb the temperature of the furnace cover 221. The circulation pipe 222 with a double helix structure can increase the coverage area of ​​the cooling medium flowing through the inside of the furnace cover 221 and improve the heat absorption efficiency. The cooling medium flows through the furnace cover 221 in a spiral shape from the outside to the inside, which can ensure that the heat conduction efficiency of the part of the furnace cover 221 in contact with the furnace chamber 214 is at a high level, and avoid the furnace cover 221 from heating up due to contact with the furnace chamber 214. The wing nut 225 can easily limit the position of the furnace cover 221 and the fixing pipe 215. The handle 226 can facilitate the disassembly and assembly of the furnace cover 221. At the same time, the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0020] During operation, the material to be heated is placed on the rack 219. The electric actuator 2111 is activated via the control panel 218. The extension and retraction of the electric actuator 2111 moves the connecting block 2110, which in turn moves the rack 219 along the recesses on both sides of the front end of the fixed tube 215, allowing the rack 219 to smoothly enter the furnace chamber 214. Then, the handle 226 is held to align the furnace cover 221 with the front end of the fixed tube 215, so that the recesses on both sides of the rear end of the furnace cover 221 are aligned with the cylindrical shape of the front end of the rack 219. The structure is fitted together, and then the wing nut 225 is tightened by the threaded post at the front end of the fixing tube 215 to achieve a sealed connection between the furnace cover 221 and the fixing tube 215, sealing the furnace chamber 214; then, the resistance wire 216 on the inner wall of the limit tube 213 is energized and heated by the control board 218. The heat generated by the resistance wire 216 is transferred to the furnace chamber 214, and the temperature inside the furnace chamber 214 rises to heat the material. During this process, the outer insulation layer 211 (composed of multiple asbestos boards) and the inner insulation layer 212 inside the outer shell 1 are connected. The components work together to fill gaps and form a double insulation barrier, reducing heat loss. Simultaneously, the thermocouple 217 at the rear of the outer shell 1 penetrates the outer insulation layer 211 and the inner insulation layer 212, monitoring the temperature inside the furnace 214 in real time and feeding the data back to the control board 218. The control board 218 adjusts the heating state of the resistance wire 216 according to the set temperature to maintain a stable temperature inside the furnace 214. During heating, a cooling medium is introduced through the water inlet pipe 223 into the two double-helix circulation pipes 222 inside the furnace cover 221. After the medium absorbs the heat from the furnace cover 221 by flowing along the circulation pipe 222, it is discharged from the drain pipe 224, thus cooling the furnace cover 221. After heating is completed, the resistance wire 216 is turned off by the control board 218. When the thermocouple 217 detects that the temperature of the furnace chamber 214 has dropped to a safe range, the butterfly nut 225 is loosened, the furnace cover 221 is removed by holding the handle 226, and then the electric push rod 2111 is started to drive the rack 219 to slide out of the furnace chamber 214. Finally, the heated material is taken out, completing one complete work cycle.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature muffle furnace, comprising an outer shell (1), characterized in that: The outer shell (1) is provided with a heating mechanism (2) for heating materials. The heating mechanism (2) includes: The heat-conducting component (21) includes an outer insulation layer (211) fixedly installed inside the outer shell (1), an inner insulation layer (212) is provided inside the outer insulation layer (211), a limiting tube (213) is provided inside the inner insulation layer (212), a furnace chamber (214) is fitted inside the limiting tube (213), a fixing tube (215) is fixedly installed at the front end of the furnace chamber (214), a resistance wire (216) is fitted inside the inner wall of the limiting tube (213), a thermocouple (217) is fixedly installed at the rear end of the outer shell (1), a control board (218) is fixedly installed at the front end of the outer shell (1), a shelf (219) is fitted inside the fixing tube (215), connecting blocks (2110) are fixedly installed on both sides of the front end of the shelf (219), and an electric push rod (2111) is connected to the rear side of the connecting block (2110). A sealing assembly (22) is provided at the front end of the limiting tube (213) to seal the furnace chamber (214).

2. The high-temperature muffle furnace according to claim 1, characterized in that: The sealing assembly (22) includes a furnace cover (221) movably mounted on the front end of the fixed pipe (215). A circulation pipe (222) is fixedly installed inside the furnace cover (221). A water inlet pipe (223) and a drain pipe (224) are respectively installed at both ends of the circulation pipe (222). A wing nut (225) is provided on the front side of the furnace cover (221). A handle (226) is fixedly installed on the front side of the furnace cover (221).

3. A high-temperature muffle furnace according to claim 1, characterized in that: The outer insulation layer (211) is made of multiple asbestos boards spliced ​​together and fills the inner cavity of the outer shell (1). The inner insulation layer (212) fills the gap between the outer insulation layer (211) and the furnace (214). The limiting tube (213) is a split structure. The rear end of the fixing tube (215) is fixedly connected to the limiting tube (213). The front end of the fixing tube (215) is provided with a threaded post. The resistance wire (216) does not contact the furnace (214).

4. A high-temperature muffle furnace according to claim 1, characterized in that: The thermocouple (217) passes through the outer shell (1), the outer insulation layer (211), and the inner insulation layer (212). The front end of the thermocouple is located behind the fixed tube (215). The shelf (219) and the furnace (214) are connected in a sliding manner. The shelf (219) is a half-cylinder. The two sides of the front end of the shelf (219) are provided with columnar structures. The connecting block (2110) is fixedly installed at the end of the columnar structure at the front end of the shelf (219). The two sides of the front end of the fixed tube (215) are provided with recesses that fit into the columnar structure of the shelf (219). The electric push rod (2111) is fixedly connected to the outer shell (1).

5. A high-temperature muffle furnace according to claim 2, characterized in that: The furnace cover (221) has recesses on both sides of its rear end that fit into the cylindrical structure of the shelf (219). The furnace cover (221) is installed at the front end of the fixing tube (215) through the threaded post at the front end of the fixing tube (215) and the wing nut (225).

6. A high-temperature muffle furnace according to claim 2, characterized in that: There are two circulation pipes (222), which are symmetrically installed inside the furnace cover (221) and form a double helix structure. The outer end of the circulation pipe (222) is fixedly connected to the water inlet pipe (223), and the inner end is fixedly connected to the drain pipe (224).

Images