CN112295631A

CN112295631A - Small-size vacuum furnace heating device in laboratory

Info

Publication number: CN112295631A
Application number: CN202011189278.XA
Authority: CN
Inventors: 李蓬勃; 明悦; 朱一鸣; 苏宁; 李忠仁
Original assignee: Shenyang Vacuum Technology Institute Co ltd
Current assignee: Shenyang Vacuum Technology Institute Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-02-02

Abstract

The invention belongs to the technical field of vacuum furnaces, and particularly relates to a heating device of a small-sized vacuum furnace in a laboratory. The laboratory heating device is simple and small in structure, convenient to use and ideal in heating effect. Enclose fender formula insulation screen including the four sides, set up the heating copper billet in the insulation screen, set up a plurality of through-hole inner chambers in the heating copper billet, every through-hole inner chamber all is provided with a heating rod, and the heating rod is insulating with a ceramic sheath with place through-hole inner chamber. The heating rods are pairwise arranged in a group, two heating rods in each group are symmetrically arranged up and down, two ends of each heating rod extend out of the inner cavity of the through hole, and the extending end parts of the upper heating rod and the lower heating rod are connected into a whole through a conductive clamp in each group of heating rods; the conductive clamps are connected by copper stranded wires, and glass fiber protective tubes for insulation are sleeved outside the copper stranded wires; in the clamping of a group of heating rods, the conductive clamp is divided into a left half part and a right half part, and after the end parts of the heating rods are clamped in the middle, the left half part and the right half part are buckled into a whole and fastened by a fastening piece.

Description

Small-size vacuum furnace heating device in laboratory

Technical Field

The invention belongs to the technical field of vacuum furnaces, and particularly relates to a heating device of a small-sized vacuum furnace in a laboratory.

Background

In the current vacuum industry, there are many small-sized experimental furnaces, and these furnace types generally require delicate furnace body design, small appearance, small occupied space, and delicate workpiece to be processed, so that the conventional relatively complex heating chamber is mostly not needed. And a heating structure which has a simple structure, is more exquisite and convenient to use and can meet the heating requirement is needed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a heating device of a small-sized vacuum furnace in a laboratory, which is a laboratory heating device with simple and small structure, convenient use and ideal heating effect.

In order to achieve the purpose, the invention adopts the following technical scheme that the four-side enclosure type thermal insulation screen comprises a four-side enclosure type thermal insulation screen and a heating copper block arranged in the thermal insulation screen, wherein a plurality of through hole inner cavities are arranged in the heating copper block, each through hole inner cavity is provided with a heating rod, and the heating rods are insulated from the through hole inner cavities by ceramic sheaths.

Two liang of a set of a plurality of heating rods, two heating rods in every group upper and lower symmetry sets up, and outside the place through-hole inner chamber was all stretched out at the both ends of every heating rod, in every group heating rod, the end connection that two heating rods stretched out about will through electrically conductive clamp is as an organic whole (specifically, in every group heating rod, one side is as an organic whole through the end connection that two heating rods stretched out about will through first electrically conductive clamp, and the end connection that two heating rods stretched out about the opposite side will be through the electrically conductive clamp of second is as an organic whole).

The conductive clips are connected by copper stranded wires, and the copper stranded wires are sleeved with glass fiber protective tubes for insulation.

In the clamping of the group of heating rods, the conductive clamp is divided into a left half part and a right half part which are arranged oppositely, after the end part of the heating rod is clamped in the middle, the left half part and the right half part are buckled into a whole and fastened by a fastening piece. And the left half part and the right half part are both provided with an upper semicircular groove and a lower semicircular groove, the upper semicircular grooves of the two half parts are buckled to form a whole circle for placing an upper heating rod, and the lower semicircular grooves are buckled to form a whole circle for placing a lower heating rod.

Further, the heating copper block is a red copper block.

Furthermore, the heating rod adopts a silicon carbide rod, and a ceramic protective tube for insulation is sleeved outside the silicon carbide rod.

Furthermore, two ceramic protective tubes are respectively sleeved at two ends of one silicon carbide rod, (wherein one ceramic protective tube is sleeved at one end of the silicon carbide rod, and the other ceramic protective tube is sleeved at the other end of the silicon carbide rod), and the through hole inner cavities are filled with the two ceramic protective tubes (so that the silicon carbide rods are supported in the through hole inner cavities and the sterile through hole inner cavities are contacted with each other). (a heat dissipation area is formed between the middle part of the silicon carbide rod and the inner cavity of the through hole).

Furthermore, the conductive clip is clamped on the silicon carbide rod sleeved with the ceramic protective tube. (the fixation of the conductive clip can limit the movement of the ceramic protective tube.)

Furthermore, the heat preservation screen is a three-layer screen structure, the thickness of each layer of screen is 0.5mm, the screens are separated by gaskets, and the distance between the screens is 2 mm.

Furthermore, a frame is arranged outside the heat-insulating screen, and the three-layer screen structure and the frame are connected into a whole by bolts and nuts.

Furthermore, the connecting nut is welded outside the frame, the screw seat supporting leg is arranged below the frame and is in threaded connection with the connecting nut, and the height of the frame from the ground can be adjusted by adjusting the relative position of the screw seat supporting leg and the connecting nut.

Furthermore, the material of the heat-insulating screen adopts 304 stainless steel.

Compared with the prior art, the invention has the beneficial effects.

The invention has simple structure, convenient installation and maintenance and ideal heating. Can reach multizone heating and accuse temperature according to the connected mode of demand through the heating member to better satisfy different heating demands. Simultaneously, due to the arrangement of the red copper block and the heat preservation screen, the heating effect can be better, the heating body and the connecting piece are small and exquisite and are simpler and more convenient, and the heating body is also a common silicon carbide rod in the market and is convenient to supplement after being consumed.

Drawings

The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.

Fig. 1-2 are schematic diagrams of the overall structure of the present invention.

Detailed Description

As shown in fig. 1-2, the present invention includes heating a copper block 1; be equipped with heating rod 2 in heating copper billet 1, just insulating with ceramic pillar 3 between heating copper billet 1 and the heating rod 2, and adopt electrically conductive clamp 5 and copper strand wires 6 to connect into required heating methods between the heating rod 2, and the copper strand wires outside adopts glass fiber pillar 7 to be insulating, and the outside is furnished with heat preservation screen structure 4 simultaneously to reach the heating effect of ideal.

Specifically, in the clamping of the group of heating rods, the conductive clamp is divided into a left half part and a right half part, the left half part and the right half part are arranged oppositely, and after the end parts of the heating rods are clamped in the middle, the left half part and the right half part are buckled into a whole and fastened by a fastening piece. And the left half part and the right half part are both provided with an upper semicircular groove and a lower semicircular groove, the upper semicircular grooves of the two half parts are buckled to form a whole circle for placing an upper heating rod, and the lower semicircular grooves are buckled to form a whole circle for placing a lower heating rod.

According to the invention, the heating copper block 1 is a red copper block, the red copper has better heat conductivity and is beneficial to heat diffusion, so that better temperature equalization performance is realized, the heating rod 2 is a silicon carbide rod, the heating rod is light and simple, meets the use conditions in a laboratory, and can achieve a good heating effect, the heating rod 2 is electrified to generate heat and radiate to heat the heating copper block in the use process, and then the copper block is uniformly radiated so as to realize heating of a workpiece.

The invention adopts the conductive clamp 5 and the copper stranded wire 6 to realize the connection between the heating rods, the upper heating rod and the lower heating rod are connected together by the conductive clamp, the heating rods are divided into four groups, the conductive connection effect is realized, meanwhile, the movement of the heating rods is fixedly limited, and simultaneously, the structure is reinforced. Then, the four groups of heating elements are connected by adopting copper stranded wires, so that multi-zone temperature control heating can be realized, and the copper stranded wires are softer, so that the connection is more convenient and the electric conductivity is also good.

The invention adopts the ceramic protective tube 3 and the glass fiber protective tube 7 for insulation. The ceramic protective tube is designed to be just placed in the through hole of the heating copper block, and meanwhile, a heating rod can be placed in the ceramic protective tube, the structure of the figure is that the inner diameter phi is 15mm, the outer diameter phi is 22mm, and the ceramic protective tube can be more compact while achieving the insulation effect after being placed; and the fixation of the conductive clamp can limit the movement of the ceramic protective tube. The glass fiber protective pipe is sleeved outside the copper stranded wire, and can be bent due to the fact that the copper stranded wire is softer and is not suitable for a hard insulating part, so that the glass fiber protective pipe is sleeved outside the copper wire to play an insulating role, can be matched more effectively, and can resist the high temperature of 800 ℃ and meet the requirement of the heating device.

The invention adopts a heat preservation screen 4 structure outside, the heat preservation screen is three layers, the material is 304, the thickness is 0.5mm, the distance between each layer is 2mm, the layers are separated by a gasket, the outermost layer is a frame with the thickness of 2mm, the material is 304, the three layers of screens and the frame are connected into a whole by adopting bolts and nuts, the nuts are welded outside the frame, then the height can be adjusted by using screw seat supporting legs, and meanwhile, the structure of the three layers of screens can play a good heat preservation effect.

The invention is firstly applied to a small brazing furnace, and can be popularized to a heating device in other experimental furnace directions with plane heating requirements, and the temperature can reach 800 ℃.

More specifically, the invention is provided with a heating copper block 1 with a main body for heat radiation; a through hole is processed in the heating element, a heating body (a silicon carbide rod) 2 is placed in the through hole, the heating body 2 and a copper block 1 are insulated by adopting a ceramic part, the heating body is connected with the outside by utilizing a conductive clamp 5, various connection modes such as series connection, parallel connection, angle connection, star connection and the like can be adopted according to needs, a heating element is connected with a binding post through a copper stranded wire, and the outside of the copper stranded wire is insulated by adopting a glass fiber sleeve; meanwhile, a heat insulation screen structure is arranged outside the heating body so as to achieve a better heating effect; the heat-preservation screen comprises a heat-preservation screen, a frame and a standard part which is connected and supported.

The invention is applicable to small-sized laboratory brazing furnaces for plane heating and other experimental furnaces with smaller furnace chambers, and the plane heating has certain requirements on temperature uniformity.

It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims

1. The heating device of the small-sized vacuum furnace in the laboratory is characterized by comprising a four-side enclosure type heat-insulating screen and a heating copper block arranged in the heat-insulating screen, wherein a plurality of through hole inner cavities are arranged in the heating copper block, each through hole inner cavity is provided with a heating rod, and the heating rods are insulated from the through hole inner cavities by ceramic sheaths;

the heating rods are pairwise arranged in a group, two heating rods in each group are symmetrically arranged up and down, two ends of each heating rod extend out of the inner cavity of the through hole, and the extending end parts of the upper heating rod and the lower heating rod are connected into a whole through a conductive clamp in each group of heating rods;

the conductive clamps are connected by copper stranded wires, and glass fiber protective tubes for insulation are sleeved outside the copper stranded wires;

in the clamping of the group of heating rods, the conductive clamp is divided into a left half part and a right half part which are arranged oppositely, after the end part of the heating rod is clamped in the middle, the left half part and the right half part are buckled into a whole and fastened by a fastening piece; and the left half part and the right half part are both provided with an upper semicircular groove and a lower semicircular groove, the upper semicircular grooves of the two half parts are buckled to form a whole circle for placing an upper heating rod, and the lower semicircular grooves are buckled to form a whole circle for placing a lower heating rod.

2. The heating apparatus for a laboratory small vacuum furnace according to claim 1, wherein: two liang a set ofly of a plurality of heating rods, two heating rods in every group upper and lower symmetry sets up, and outside the place through-hole inner chamber was all stretched out at the both ends of every heating rod, in every group heating rod, the end connection that two heating rods stretched out about will through electrically conductive clamp is as an organic whole.

3. The heating apparatus for a laboratory small vacuum furnace according to claim 2, wherein: the conductive clips are connected by copper stranded wires, and the copper stranded wires are sleeved with glass fiber protective tubes for insulation.

4. The heating apparatus for a laboratory small vacuum furnace according to claim 1, wherein: the heating copper block is a red copper block.

5. The heating apparatus for a laboratory small vacuum furnace according to claim 1, wherein: the heating rod adopts a silicon-carbon rod, and the silicon-carbon rod is sleeved with a ceramic protective tube for insulation.

6. The heating apparatus for a laboratory small vacuum furnace according to claim 5, wherein: two ends of a silicon carbide rod are respectively sleeved with a ceramic protection tube, and the inner cavity of the through hole is filled with the two ceramic protection tubes, so that the silicon carbide rod is supported in the inner cavity of the through hole and is not contacted with the inner cavity of the through hole.

7. The heating apparatus for laboratory small vacuum furnace according to claim 6, wherein: the conductive clip is clamped on a silicon-carbon rod sleeved with a ceramic protective tube.

8. The heating apparatus for a laboratory small vacuum furnace according to claim 1, wherein: the heat preservation screen is three-layer screen structure, and every layer of screen thickness is 0.5mm, and the screen separates with the gasket for the screen, and the interval between screen and screen is 2 mm.

9. The heating apparatus for a laboratory small vacuum furnace according to claim 8, wherein: the frame is arranged outside the heat preservation screen, and the three-layer screen structure and the frame are connected into a whole by bolts and nuts.

10. The heating apparatus for a laboratory small vacuum furnace according to claim 9, wherein: the frame outside welding has coupling nut, and the frame below is provided with the screw rod seat supporting leg, and this screw rod seat supporting leg and coupling nut threaded connection through the relative position of adjusting screw rod seat supporting leg and coupling nut, adjustable frame terrain clearance.