CN114043033B - Vacuum brazing furnace - Google Patents

Abstract

The invention discloses a vacuum brazing furnace, which comprises a vacuum system, a condensation degreasing system and a furnace body, wherein a temperature control system, a cooling system, a process pipeline system, a loading system and a terminal system are arranged in the furnace body, the vacuum system at least comprises a first-stage vacuum pipeline, a second-stage vacuum pipeline and a third-stage vacuum pipeline, and the first-stage vacuum pipeline, the second-stage vacuum pipeline and the third-stage vacuum pipeline control the pressure of the furnace body in different process stages^‑1‑10^‑2Pa, oil diffusion pump as main pump, rotary vane pump, Roots pump and oil diffusion pump to obtain pressure value of 10^‑3‑10^‑4Pa vacuum.

Description

Vacuum brazing furnace

Technical Field

The invention belongs to the field of resistance furnaces, and relates to a vacuum brazing furnace.

Background

The conventional degreasing heat treatment process mainly comprises the steps of feeding a workpiece to be heat-treated and formed into a furnace body, closing a furnace door, feeding current-carrying gas into the furnace, heating and vacuumizing, detecting the gas pressure in the furnace and collecting the gas pressure of a wax catching tank group of the discharged gas, adjusting the flow rate of the current-carrying gas and the vacuum degree of the wax catching tank group according to the gas pressure, and keeping the pressure difference between the gas pressure in the furnace and the wax catching tank group within a set range, namely the conventional degreasing heat treatment process needs to feed the current-carrying gas (hydrogen or nitrogen) into the furnace, continuously calculates the pressure difference between the gas pressure in the furnace and the wax catching tank group in the operation process, has complex operation process and structure, and simultaneously has the problems of high pressure in the furnace and being not beneficial to heat treatment of some products in the heat treatment process.

Disclosure of Invention

The invention provides a vacuum brazing furnace for overcoming the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: vacuum brazing furnace, its characterized in that: the vacuum furnace comprises a vacuum system, a condensation degreasing system and a furnace body, wherein a temperature control system is arranged in the furnace body, a cooling system, a process pipeline system, a loading system and a terminal system, the vacuum system at least comprises a first-stage vacuum pipeline, a second-stage vacuum pipeline and a third-stage vacuum pipeline, the first-stage vacuum pipeline, the second-stage vacuum pipeline and the third-stage vacuum pipeline control the pressure of the furnace body at different process stages, the condensation degreasing system comprises a condensation degreasing device and a grease collecting device, the condensation degreasing device comprises a first-stage condensation mechanism and a second-stage condensation mechanism, the grease collecting device comprises a first-stage grease collecting piece and a second-stage grease collecting piece, mixed gas is degreased through the first-stage condensation mechanism and the second-stage condensation mechanism in sequence, and grease substances are collected through the first-stage grease collecting piece and the second-stage grease collecting piece; the temperature control system comprises a heat insulation assembly, a heating assembly and a water-cooling electrode, and is used for heating the workpiece; the cooling system comprises a hot air circulation mechanism and a cooling mechanism, the hot air circulation mechanism comprises a fan and an exhaust assembly, the cooling mechanism comprises a heat exchanger, the hot air circulation mechanism and the cooling mechanism exchange heat in the furnace body to be exhausted out of the furnace body, and the cooling system is used for cooling workpieces; the process pipeline system comprises a vacuum release loop, a nitrogen injection loop and a process gas injection loop, wherein the vacuum release loop, the nitrogen injection loop and the process gas injection loop are respectively used for different processes of the furnace body, the vacuum release loop comprises a vacuum release valve, the nitrogen injection loop comprises a nitrogen injection valve, and the process gas injection loop comprises a process gas injection valve, a vacuum release valve, a nitrogen injection valve and a process gas injection valve which control the processes of the furnace body; the loading system is used for loading workpieces.

Further, the method comprises the following steps of; the primary vacuum pipeline comprises a primary pump, a primary valve, a secondary primary valve, a tertiary primary valve and a tail box, the secondary vacuum pipeline comprises a secondary pump, a primary secondary valve, a secondary valve and a tertiary secondary valve, the tertiary vacuum pipeline comprises a main pump and a main valve, the main valve is fixedly arranged on the upper side of the main pump and is mutually communicated, the main valve is communicated with the furnace body through an air inlet pipe, all the parts of the primary vacuum pipeline, the secondary vacuum pipeline and the tertiary vacuum pipeline are communicated through pipelines, the tail box is communicated with the primary pump, the tertiary primary valve is communicated with the air inlet pipe through a pipeline, the secondary primary valve is connected with the primary pump through a pipeline, the tertiary primary valve is connected with the primary pump through a pipeline, the secondary primary valve is connected with the air outlet end of the condensation degreasing system, the air inlet end of the condensation degreasing system is connected with the furnace body, the condensation degreasing system and the secondary primary valve form mixed gas which is introduced and degreased by the condensation degreasing system, The furnace body, the condensation degreasing system, the secondary primary valve, the primary pump and the tail box form a primary pressure control passage, and the pressure range is set to be 1-10 Pa.

Further, the method comprises the following steps of; the secondary valve is communicated with the main valve through a pipeline, the secondary valve is communicated with the secondary pump through a pipeline, the secondary pump is communicated with the primary valve, the primary valve is communicated with the primary pump, the furnace body, the air inlet pipe, the main valve, the secondary valve, the secondary pump, the primary valve, the primary pump and the tail box form a secondary pressure control passage, the secondary pump and the primary pump control the pressure of the furnace body, and the pressure range is set at 10^-1-10^-2Pa, the primary secondary valve is communicated with the main pump through a pipeline, the secondary valve is communicated with the primary secondary valve through a pipeline, a pipeline for communicating the secondary valve with the secondary pump is communicated with the primary secondary valve, the furnace body, the air inlet pipe, the main valve, the main pump, the primary secondary valve, the secondary pump, the primary valve, the primary pump and the tail box form a three-stage pressure control passage, the main pump, the secondary pump and the primary pump control the pressure of the furnace body, and the pressure range is set at 10^-3-10^-4Pa。

Further, the method comprises the following steps of; the primary condensing mechanism is arranged to be an inclined structure, the primary condensing mechanism is communicated with the furnace body through the air inlet assembly, the mixed gas circulates to the primary condensing mechanism through the air inlet assembly, the primary condensing mechanism comprises a primary condensing pipe and a primary air inlet pipe, a primary air inlet pipe is communicated with the secondary condensing mechanism, a primary cooling medium inlet and a primary cooling medium outlet of the primary condensing pipe are positioned outside the primary air inlet pipe, and the primary condensing pipe converts the state of lipid substances in the mixed gas into a liquid state and a solid state through a cooling medium; the second grade condensation mechanism includes second grade condenser pipe and second grade intake pipe, second grade intake pipe and grease collection device intercommunication, one-level intake pipe and second grade intake pipe intercommunication, the second grade coolant entry and the second grade coolant export of second grade condenser pipe are located second grade intake pipe outside, the second grade condenser pipe turns into liquid and solid-state through the lipid material state of cooling medium in with the mist, the mist is through further degrease through second grade condensation mechanism after the partial degrease of one-level condensation mechanism.

Further, the method comprises the following steps of; grease collection device includes the box, sets up one-level grease collection piece and second grade grease collection piece in the box, and the one-level grease collection piece is located the top that the piece was collected to the second grade grease, and both intercommunications, and the piece is collected to the one-level grease and the second grade intake pipe intercommunication of second grade condensation mechanism, and liquid lipid material and mist and the liquid lipid material of one-level grease collection piece heat exchange condensation are through perforation flow direction second grade grease collection piece.

Further, the method comprises the following steps of; the furnace body includes furnace gate, furnace and stove tail, and the casing of furnace gate, furnace and stove tail adopts bilayer structure respectively, including the skin that is located the outside and the inlayer that is located the inboard, forms the intermediate layer between skin and the inlayer, and cooling medium lets in the intermediate layer, and the surface temperature rise of control furnace body is not more than 25 ℃, and the inlayer adopts the airtight structure in vacuum, and the leak rate of control furnace body is not more than 1.3x10^-7Pa.L/s, the outer layer and the inner layer are made of steel materials, and a furnace chamber is arranged in the furnace chamber.

Further, the method comprises the following steps of; the heat control system comprises a heat insulation assembly, a heating assembly and a water-cooling electrode, wherein the heat insulation assembly comprises a plurality of heat shields which are arranged in a stacked mode, the heating assembly comprises a plurality of heaters, the heating assembly is located in the heat insulation assembly, the heating assembly controls the temperature of a furnace chamber in the furnace body, the heat insulation assembly reflects heat radiated by the heating assembly to prevent heat dissipation, and the water-cooling electrode is used for supplying power to the heaters and cooling the water-cooling electrode through cooling water; the heat insulation assembly comprises a heat insulation sealing cover, a heat insulation chamber and a heat insulation mounting cover, the heat insulation sealing cover is fixedly mounted at one end of the heat insulation chamber, the heat insulation mounting cover is detachably mounted at the other end of the heat insulation chamber, the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover form a heat insulation cavity, the heating assembly is mounted in the heat insulation cavity, the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover are respectively arranged in a stacking mode through a plurality of heat insulation screens, the shapes of the heat insulation screens at the positions of the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover are respectively matched with the shapes of the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover, and the plurality of heat insulation screens of the heat insulation chamber are sequentially stacked inwards along the radial direction of the heat insulation chamber; the cooling system comprises a hot air circulation mechanism and a cooling mechanism, the hot air circulation mechanism comprises a fan and an exhaust assembly, the cooling mechanism comprises a heat exchanger, and the hot air circulation mechanism and the cooling mechanism discharge heat in the furnace chamber out of the furnace body through heat exchange; the process pipeline system comprises a vacuum release loop, a nitrogen injection loop and a process gas injection loop, wherein the vacuum release loop, the nitrogen injection loop and the process gas injection loop are respectively used for different processes of the furnace body, the vacuum release loop comprises a vacuum release valve, the nitrogen injection loop comprises a nitrogen injection valve, and the process gas injection loop comprises a process gas injection valve, a vacuum release valve, a nitrogen injection valve and a process gas injection valve which control the processes of the furnace body; the loading system comprises a lifting structure and a graphite box body, the lifting structure comprises a lifting power mechanism and a top cover, the graphite box body is fixedly provided with an observation hole, a workpiece is installed in the graphite box body, the lifting power mechanism controls the top cover to move and is used for sealing or keeping away from the observation hole, and the observation hole is used for observing the workpiece in the graphite box body.

Further, the method comprises the following steps of; the wiring terminal system comprises a base, a pressing plate, a limiting sleeve, a fastening sealing mechanism and a fixing sealing mechanism, the fan comprises an electrode, the limiting sleeve and the base are fixedly connected in a sealing mode through the fastening sealing mechanism, and the limiting sleeve and the electrode are fixedly connected in a sealing mode through the fixing sealing mechanism.

Further, the method comprises the following steps of; the base is provided with a plurality of groups of fastening holes distributed in a rectangular array, the pressing plate is fixedly provided with connecting holes opposite to the fastening holes, the fastening holes correspond to the connecting holes one by one, and the fastening pieces penetrate through the fastening holes and the connecting holes to fixedly connect the base and the pressing plate; the base comprises a furnace cavity side facing the furnace cavity and a furnace tail side facing the furnace tail, the pressing plate is fixedly arranged on the furnace tail side of the base, the base is fixedly provided with a first installation cavity and a second installation cavity which are mutually communicated, the first installation cavity is communicated with the furnace cavity side, the second installation cavity is communicated with the furnace tail side, and the electrodes are arranged in the first installation cavity and the second installation cavity; the limiting sleeve comprises a square end and a round end, the round end of the limiting sleeve penetrates through the second mounting cavity, the square end of the limiting sleeve is mounted in the first mounting cavity, the square end is fixedly provided with an annular cavity, a first O-shaped ring is sleeved in the annular cavity, the fastening and sealing mechanism comprises a flat washer, a spring washer and a thin nut, the flat washer, the spring washer and the thin nut are sequentially mounted on the limiting sleeve, and the limiting sleeve is fixedly connected with the base through the thin nut; the electrode is characterized in that a first through cavity and a second through cavity which are communicated with each other are fixedly arranged in the limiting sleeve, the first through cavity penetrates through the square end of the limiting sleeve, the second through cavity penetrates through the round end of the limiting sleeve, the electrode comprises a flat end used for screwing and a mounting end used for mounting, the flat end is symmetrically and fixedly arranged at two ends of the mounting end, the electrode penetrates through the first through cavity and the second through cavity, the mounting end is located in the first through cavity and the second through cavity, the flat end is respectively located on the outer sides of the end faces of the square end and the round end of the limiting sleeve, the fixed sealing mechanism is located in a gap between the second through cavity and the electrode, the fixed sealing mechanism comprises a second O-shaped ring, a spacer sleeve, a third O-shaped ring, a gasket and an adjusting nut, the second O-shaped ring, the spacer sleeve, the third O-shaped ring, the gasket and the adjusting nut are sequentially arranged on the electrode, and the fixed sealing mechanism is fixedly connected with the electrode through the adjusting nut.

Further, the method comprises the following steps of; the vacuum system also comprises a pressure maintaining mechanism, the pressure maintaining mechanism comprises a maintaining pump, the maintaining pump is respectively communicated with the three-stage secondary valve and the tail box through pipelines, a pressure maintaining passage is formed by the furnace body, the air inlet pipe, the main valve, the main pump, the three-stage secondary valve, the maintaining pump and the tail box, and the maintaining pump maintains the pressure range at 10^-3-10^-4Pa。

In conclusion, the invention has the advantages that:

1) the invention adopts high vacuum pneumatic baffle valve as the switch valve of each loop, adopts a vane pump to obtain the low vacuum of 1-10Pa of the furnace body, meets the degreasing process requirement and the starting requirement of the oil diffusion pump, adopts a roots pump as the second-stage pump of the furnace body, is a backing pump of the oil diffusion pump, operates by the combination of the vane pump and the roots pump, and obtains the pressure value of 10 in the furnace body^-1-10^-2Pa, oil diffusion pump as main pump, rotary vane pump, Roots pump and oil diffusion pump to obtain pressure value of 10^-3-10^-4Pa, the furnace body pressure in different process stages is controlled by adopting a primary vacuum pipeline, a secondary vacuum pipeline and a tertiary vacuum pipeline, so that the equipment complexity and the cost are reduced; the invention obtains the pressure value of 10 through the vacuum pipeline^-3-a vacuum degree of 10-4Pa, the number and kind of heat treatments to expand the workpiece; the invention adopts a pressure maintaining mechanism to ensure the vacuum value of the furnace body.

2) The degreasing device adopts a quadruple degreasing mode to degrease mixed gas, wherein one degreasing mode is a first-stage condensing mechanism degreasing mode, the other degreasing mode is a second-stage condensing mechanism degreasing mode, the third degreasing mode is a first-stage grease collecting part degreasing mode, the fourth degreasing mode is a box degreasing mode, the first-stage condensing mechanism and the second-stage condensing mechanism degrease a large amount of grease in the mixed gas, and the first-stage grease collecting part and the box degrease a small amount of grease in the mixed gas degreased by the condensing and degreasing device, so that the grease is effectively separated from the gas, the cleanliness of the discharged gas is improved, and the pollution to equipment and the environment is reduced.

3) Compared with the primary condensation mechanism without an angle with the horizontal plane, the inclined arrangement improves the speed of grease collection, simultaneously ensures that no liquid grease is left in the primary air inlet pipe as far as possible, avoids the influence of the left liquid grease on the heat exchange between primary condensation and mixed gas, and reduces the degreasing speed; according to the invention, the primary condensation mechanism is set to be an inclined structure, the secondary condensation mechanism is set to be a horizontal structure, the length of the secondary air inlet pipe is smaller than that of the primary air inlet pipe, the primary condensation mechanism is designed through the structure to remove most of lipid substances in the mixed gas, the secondary condensation mechanism removes a small part of lipid substances in the mixed gas, the liquid lipid substances converted by the condensation secondary air inlet pipe flow to the grease collecting device together through the gravity action of the liquid lipid substances converted by the primary condensation mechanism, the structure of the equipment is optimized, and the degreasing efficiency is effectively improved.

4) The furnace body of the invention adopts a double-layer structure, a cooling medium is introduced into the interlayer, the temperature rise of the outer surface of the furnace body is ensured to be not more than 25 ℃, the inner layer adopts a vacuum airtight structure, and the leakage rate of the furnace body is ensured to be not more than 1.3x10^-7Pa.L/s, and simultaneously, the furnace body is taken as an installation carrier of related equipment to reduce the floor area of the equipment.

5) The invention utilizes the heat shields arranged in a laminating way to reflect the heat radiated by the heater layer by layer, effectively prevent the heat from losing and reduce the temperature of the inner surface of a hearth, the invention designs a plurality of heat insulation ring rods on the outer surface of the heat insulation hearth along the axial direction, the radian of the outer surface of the heat insulation ring rods is matched with the arc shape of the inner surface of a furnace chamber, the heat insulation ring rods can strengthen the laminating installation strength of the heat shields and ensure the stability, the heater adopts high-temperature resistance heating elements, the heaters are sequentially and uniformly distributed at intervals along the axial direction of the heat insulation hearth, the uniform heat distribution in the heat insulation chamber is ensured, the high-precision temperature uniformity in the furnace is obtained, thereby improving the quality of workpieces, reducing the energy consumption and improving the production efficiency, the invention designs the connecting and fixing device to connect the heaters and the heat shields, the first positioner sleeved by the connecting and fixing rod is positioned between the adjacent heat shields, the space between the adjacent heat shields is the same, the heat shields are convenient to install, the second positioner sleeved with the connecting fixing rod is positioned between the inner heat shield and the heaters, and the space between the heaters and the heat shields is kept constant.

6) The cold air fixing end and the cold air connecting end are fixedly connected through the cold air connecting rod, the strength of the cold air distributor is enhanced, one end of the cold air pipe is set to be a sealing end, so that nitrogen is sprayed out of the furnace chamber along the air flow channel through the cold air outlet pipe, the spraying amount and the spraying speed of the nitrogen are improved, and the spraying uniformity of the nitrogen is ensured at the same time; the vacuum relief valve, the nitrogen injection valve and the process gas injection valve adopt the high-vacuum pneumatic baffle valve as the switch valve of each loop, and the nitrogen is fed into the furnace body or the vacuum in the furnace is relieved by opening the vacuum relief valve, the nitrogen injection valve and the process gas injection valve so as to open the furnace door; or process gas is fed into the furnace, thereby realizing different process requirements.

7) According to the invention, the electrode is arranged on the base through the limiting sleeve, the limiting sleeve is connected with the base in a sealing manner through the fastening sealing mechanism, and the limiting sleeve is connected with the electrode in a sealing manner through the fixing sealing mechanism, so that the sealing performance of the binding post is improved, and meanwhile, the maintenance and the adjustment are convenient; the invention reduces the evaporation amount of the sealing material to grease in the furnace cavity and reduces the pollution to the furnace cavity; the invention does not need a glue pouring machine and a special tool, thereby reducing the manufacturing and using cost.

Drawings

FIG. 1 is a schematic view of a vacuum brazing furnace according to the present invention.

Fig. 2 is a schematic view of the vacuum system and condensed degreasing system assembly of the present invention.

FIG. 3 is a schematic view of the apparatus of the present invention.

FIG. 4 is a schematic top view of the apparatus of the present invention.

Fig. 5 is a schematic view in the direction a in fig. 4.

Fig. 6 is a sectional view of B-B in fig. 5.

Fig. 7 is a sectional view of C-C in fig. 6.

FIG. 8 is a schematic view of a half-section of the device in the furnace body of the present invention.

FIG. 9 is a schematic view of a temperature control system of the present invention.

Fig. 10 is an enlarged view of D in fig. 8.

FIG. 11 is a schematic view of the cooling system of the present invention.

Fig. 12 is a schematic view of a cold air dispenser according to the present invention.

Fig. 13 is a schematic half-section view of a cold air distributor according to the present invention.

FIG. 14 is a schematic view of a process piping system of the present invention.

FIG. 15 is a schematic view of a loading system of the present invention.

FIG. 16 is a schematic view of the apparatus of the present invention.

Fig. 17 is a front view of the apparatus of the present invention.

FIG. 18 is a top view of the apparatus of the present invention.

Fig. 19 is a rear view of the device of the present invention.

FIG. 20 is a cut-away view of E-E in FIG. 17.

Fig. 21 is an enlarged view of F in fig. 20.

Fig. 22 is an enlarged schematic view of G in fig. 20.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, amount and ratio of the components in practical implementation may be changed arbitrarily, and the layout of the components may be complicated.

All directional indicators (such as up, down, left, right, front, rear, lateral, longitudinal … …) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the movement, etc. in a particular posture, and if the particular posture changes, the directional indicator changes accordingly.

The first embodiment is as follows:

as shown in fig. 1-22, the vacuum brazing furnace comprises a vacuum system 1, a condensation degreasing system 2 and a furnace body 7, wherein a temperature control system 3, a cooling system 4 and a process pipeline system 5 are arranged in the furnace body 7, the loading system 6 and the terminal system 8, the vacuum system 1 includes the first-class vacuum pipeline at least, second grade vacuum pipeline and third grade vacuum pipeline, the first-class vacuum pipeline, the second-class vacuum pipeline and the third-class vacuum pipeline control the pressure of the furnace body 7 of different process stages, the condensation degreasing system 2 includes condensation degreasing unit and grease collecting device, the condensation degreasing unit includes the first-class condensation mechanism and second-class condensation mechanism, the grease collecting device includes the first-class grease collecting piece 28 and second-class grease collecting piece 29, the mixed gas is degreased through the first-class condensation mechanism and second-class condensation mechanism in proper order, the grease substance is collected through the first-class grease collecting piece 28 and second-class grease collecting piece 29; the temperature control system 3 comprises a heat insulation assembly, a heating assembly and a water-cooling electrode 33, and the temperature control system 3 is used for heating a workpiece; the cooling system 4 comprises a hot air circulation mechanism and a cooling mechanism, the hot air circulation mechanism comprises a fan 41 and an exhaust component, the cooling mechanism comprises a heat exchanger 44, the hot air circulation mechanism and the cooling mechanism exchange heat in the furnace body to be exhausted out of the furnace body 7, and the cooling system 4 is used for cooling workpieces; the process pipeline system 5 comprises a vacuum release loop, a nitrogen injection loop and a process gas injection loop, wherein the vacuum release loop, the nitrogen injection loop and the process gas injection loop are respectively used for different processes of the furnace body 7, the vacuum release loop comprises a vacuum release valve 512, the nitrogen injection loop comprises a nitrogen injection valve 533, the process gas injection loop comprises a process gas injection valve 541, and the vacuum release valve 512, the nitrogen injection valve 533 and the process gas injection valve 541 control the processes of the furnace body 7; the loading system 6 is used for loading workpieces.

The primary vacuum pipeline comprises a primary pump 161, a primary valve 111, a secondary primary valve 112, a tertiary primary valve 113 and a tail tank 151, the secondary vacuum pipeline comprises a secondary pump 124, a primary secondary valve 121, a secondary valve 122 and a tertiary secondary valve 123, the tertiary vacuum pipeline comprises a main pump 142 and a main valve 141, the main valve 141 is fixedly arranged on the upper side of the main pump 142 and is communicated with the furnace body 7 through an air inlet pipe 131, the parts of the primary vacuum pipeline, the secondary vacuum pipeline and the tertiary vacuum pipeline are communicated through pipelines (not shown in the figure), in the embodiment, the tail tank 151 is provided with two groups, one group of tail tanks 151 are communicated with the primary pump 161, the tertiary primary valve 113 is communicated with the air inlet pipe 131 through a pipeline, the secondary primary valve 112 is connected with the primary pump 161 through a pipeline, the tertiary primary valve 113 is connected with the primary pump 161 through a pipeline, the secondary primary valve 112 is connected with an air outlet end of the degreasing system 2, the gas inlet end of the condensation degreasing system 2 is connected with the furnace body 7, the condensation degreasing system 2 and the secondary primary valve 112 form a workpiece degreasing passage through which mixed gas is introduced and degreased by the condensation degreasing system 2 and is led out by the secondary primary valve 112, the furnace body 7, the condensation degreasing system 2, the secondary primary valve 112, the primary pump 161 and the tail box 151 form a primary pressure control passage (or degreasing passage), the pressure range is set to be 1-10Pa, the temperature control system 3 and the cooling system 4 control the temperature of the workpiece, in the embodiment, the temperature control system 3 heats up at a speed of 50-100 ℃/h, the temperature control system 3 controls the workpiece and the ambient temperature in the effective area of the furnace body 7 to be 300-400 ℃, the binder and the forming agent in the workpiece are gradually gasified in the temperature range to form mixed gas, and the mixed gas flows along the primary pressure control passage, grease in the mixed gas is degreased by the condensing and degreasing system 2, further, the degreasing time of the furnace body 7 is set, the degreasing time range is set to be 1.5h-2.5h, preferably 2h, so that the workpieces are completely degreased, and the pressure control and the temperature control not only meet the degreasing requirements of the workpieces, but also meet the starting requirements of the main pump 142.

The secondary valve 122 is connected to the main valve 141 through a pipe, the secondary valve 122 is connected to the secondary pump 124 through a pipe, the secondary pump 124 is connected to the primary valve 111, and the primary valve 111 is connected to the primary pump 161. in this way, the furnace body 7, the gas inlet pipe 131, the main valve 141, the secondary valve 122, the secondary pump 124, the primary valve 111, the primary pump 161, and the tail tank 151 form a secondary pressure control path, the secondary pump 124 and the primary pump 161 control the pressure of the furnace body 7, and the pressure range is set at 10^-1-10^-2Pa, in this embodiment, the temperature control system 3 heats up at a rate of 50-100 ℃/h, the temperature control system 3 controls the temperature of the workpiece at 400-.

The primary secondary valve 121 is connected with the main pump through a pipeline142, the secondary valve 122 and the secondary pump 124 are communicated with the primary valve 121, the furnace body 7, the air inlet pipe 131, the main valve 141, the main pump 142, the primary valve 121, the secondary pump 124, the primary valve 111, the primary pump 161 and the tail tank 151 form a three-stage pressure control passage, the main pump 142, the secondary pump 124 and the primary pump 161 control the pressure of the furnace body 7, and the pressure range is set at 10^-3-10^-4Pa, in this embodiment, the temperature control system 3 heats up at a rate of 50-100 ℃/h, the temperature control system 3 controls the temperature of the workpiece at 400-.

The vacuum system 1 further includes a pressure maintaining mechanism including a maintaining pump 171, the maintaining pump 171 is respectively communicated with the three-stage secondary valve 123 and the other group of the tail tanks 151 through pipes, the furnace body 7, the air inlet pipe 131, the main valve 141, the main pump 142, the three-stage secondary valve 123, the maintaining pump 171 and the tail tanks 151 form a pressure maintaining passage, and the maintaining pump 171 maintains the pressure range at 10^-3-10^-4Pa, the vacuum requirement of normal heat treatment of the workpiece is met.

Further, when the pressure of the furnace body 7 is more than 10^-3After Pa, the main valve 141 is opened, the main pump 142 is operated, and the pressure of the furnace body 7 is adjusted by the main valve 141 and the main pump 142 to control the pressure range of the furnace body 7 to 10^-3-10^-4Pa, and circulating according to the above steps until the workpiece is heated.

In this embodiment, the primary pump 161 and the maintenance pump 171 are vane pumps, the secondary pump 124 is a roots pump, the main pump 142 is an oil diffusion pump, and the main valve 141 is a three-stage valve.

In other embodiments, the number of tailboxes 151 may be provided in a single set, and the maintenance pump 171 and the primary pump 161 may be in communication with a single set of tailboxes 151.

In this embodiment, the primary valve 111, the secondary valve 112, the tertiary valve 113, the primary valve 121, the secondary valve 122, the tertiary valve 123, and the main valve 141 are high vacuum pneumatic flapper valves.

As shown in fig. 3-7, the condensation degreasing system 2 comprises a condensation degreasing device and a grease collecting device, the condensation degreasing device comprises a first-stage condensation mechanism and a second-stage condensation mechanism, the grease collecting device comprises a first-stage grease collecting part 28 and a second-stage grease collecting part 29, the mixed gas is degreased by the first-stage condensation mechanism and the second-stage condensation mechanism in sequence, and the grease substances are collected by the first-stage grease collecting part 28 and the second-stage grease collecting part 29.

The condensation degreasing device is communicated with the furnace body 7, the grease collecting device is communicated with the vacuum system 1, mixed gas led out from the furnace body 7 is degreased through the condensation effect of the condensation degreasing device, the grease collecting device collects grease, and the degreased gas is led into the vacuum system 1.

The primary condensation mechanism is communicated with the furnace body 7 through a condensation air inlet component 27, mixed gas circulates to the primary condensation mechanism through the condensation air inlet component 27, and specifically, the primary condensation mechanism comprises a primary condensation pipe 251 and a condensation primary air inlet pipe 250, one end of the condensation primary air inlet pipe 250 is detachably connected with a condensation sealing cover 2501, the other end of the condensation primary air inlet pipe 250 is communicated with the secondary condensation mechanism, the primary condensation pipe 251 penetrates through the condensation sealing cover 2501 to extend into the condensation primary air inlet pipe 250 and is fixedly connected with the condensation sealing cover 2501, a primary cooling medium inlet 2511 and a primary cooling medium outlet 2512 of the primary condensation pipe 251 are positioned outside the condensation primary air inlet pipe 250 to realize circulation of cooling media, in the embodiment, the cooling media control the pipe wall temperature of the primary condensation pipe 251 to be not higher than 30 ℃, and the state of lipid substances in the mixed gas is converted into liquid state and solid state through the primary condensation pipe 251, make things convenient for the collection of grease, it is further, as shown in fig. 6, one-level condensation mechanism sets up to the slope structure, preferred 5 with this embodiment of inclination of horizontal plane, thereby make the liquid lipid material of conversion in the condensation one-level intake pipe 250 flow to second grade condensation mechanism under the action of gravity until flowing to grease collection device, compare in the one-level condensation mechanism that does not have the angle with the horizontal plane, adopt the slope to set up the speed that has improved the grease collection, guarantee the liquid grease of condensation one-level intake pipe 250 as far as simultaneously and leave over, avoid the liquid grease of leaving to influence the heat exchange of one-level condenser pipe 251 and mist, reduce the degreasing speed.

The secondary condensation mechanism is communicated with the primary condensation mechanism, as shown in fig. 6, the primary condensation mechanism is arranged in an inclined structure, the secondary condensation mechanism is parallel to the horizontal plane, the degreasing principle of the secondary condensation mechanism is the same as that of the primary condensation mechanism, specifically, the secondary condensation mechanism comprises a secondary condensation pipe 252 and a condensation secondary air inlet pipe 253, from the perspective of fig. 4, the primary condensing mechanism is connected to the secondary condensing mechanism vertically or nearly vertically, and in this embodiment, the length of the condensation secondary air inlet pipe 253 is set to be smaller than that of the condensation primary air inlet pipe 250, most of lipid substances in the mixed gas are removed by the primary condensation mechanism, the small part of lipid substances in the mixed gas are removed by the secondary condensation mechanism, the liquid lipid substances converted by the primary condensation mechanism flow to the condensation secondary air inlet pipe 253 under the action of gravity, and drives the liquid lipid substances converted by the condensation secondary air inlet pipe 253 to flow to the lipid collecting device together; one end of the condensation secondary air inlet pipe 253 is detachably connected with a condensation end cover 2531, the other end of the condensation secondary air inlet pipe 253 is communicated with a grease collecting device, the condensation primary air inlet pipe 250 is communicated with the condensation secondary air inlet pipe 253, the mixed gas is partially degreased by the primary condensation mechanism and then flows to the condensation secondary air inlet pipe 253 of the secondary condensation mechanism through the condensation primary air inlet pipe 250, and is further degreased by the secondary condensation mechanism, the secondary condensation pipe 252 penetrates through the condensation end cover 2531 to extend to the condensation secondary air inlet pipe 253 and is fixedly connected with the condensation end cover 2531, a secondary cooling medium inlet 2521 and a secondary cooling medium outlet 2522 of the secondary condensation pipe 252 are positioned outside the condensation secondary air inlet pipe 253 to realize the circulation and circulation of a cooling medium, in the embodiment, the cooling medium controls the pipe wall temperature of the secondary condensation pipe 252 to be not higher than 30 ℃, and the state of lipid substances in the mixed gas is converted into a liquid state and a solid state through the secondary condensation pipe 252, the collection of grease is convenient.

The degreasing process of the condensation degreasing device is as follows, when degreasing is needed, under the action of the vacuum system 1, the mixed gas enters the condensation primary inlet pipe 250 from the furnace body 7 through the condensation gas inlet component 27, the temperature of the wall of the condensation primary inlet pipe 250 is reduced by the primary condenser pipe 251, the mixed gas exchanges heat with the wall of the primary condenser pipe 251 and the wall of the condensation primary inlet pipe 250 to reduce the temperature of the lipid substances, when the temperature of the lipid substances is reduced to a certain temperature range, the preferable temperature range of the embodiment is 120-80 ℃, the lipid substances are condensed into liquid state and flow to the lipid collecting device along the outer wall of the primary condenser pipe 251, the condensation primary inlet pipe 250 and the condensation secondary inlet pipe 253, the mixed gas which is partially degreased enters the condensation secondary inlet pipe 253 from the condensation primary inlet pipe 250, and the secondary condensing mechanism adopts the same degreasing principle as the primary condensing mechanism, the partially degreased mixed gas continues to convert lipid substances into liquid lipid through the condensation effect of the secondary condensation pipe 252 and flows to the lipid collection device, in addition, the liquid lipid substances attached to the outer wall of the primary condensation pipe 251 and the condensation secondary air inlet pipe 253 further reduce the temperature through the effect of a cooling medium, the temperature range of the temperature reduction is preferably 80-30 ℃, the liquid lipid substances are converted into solid state, namely the liquid lipid substances attached to the outer wall surfaces of the primary condensation pipe 251 and the condensation secondary air inlet pipe 253 become condensation nuclei to promote the liquid lipid substances around the condensation nuclei to condense and convert into solid state, the temperature of the solid lipid substances on the surfaces of the primary condensation pipe 251 and the secondary condensation pipe 252 reaches a certain thickness, the heat exchange between the primary condensation pipe 251 and the secondary condensation pipe 252 and the mixed gas is influenced, when the degreasing device is turned off, dismantle condensation closing cap 2501 and condensation end cover 2531, take out condensation one-level intake pipe 250 and condensation second grade intake pipe 253 with one-level condensing mechanism and second grade condensing mechanism respectively, clear up the solid-state lipid material of one-level condenser pipe 251 and the outer pipe wall of second grade condenser pipe 252, wash condensation one-level intake pipe 250 and condensation second grade intake pipe 253 simultaneously, one-level condenser pipe 251 and second grade condenser pipe 252 after the clearance is accomplished are installed again.

The grease collecting device comprises a condensation pipe degreasing box body 21, a first-level grease collecting piece 28 and a second-level grease collecting piece 29 which are arranged in the condensation pipe degreasing box body 21, wherein the first-level grease collecting piece 28 is positioned above the second-level grease collecting piece 29 and is communicated with the second-level grease collecting piece 29, the first-level grease collecting piece 28 is communicated with a condensation second-level air inlet pipe 253, the condensation second-level air inlet pipe 253 extends to the first-level grease collecting piece 28, in the embodiment, the first-level grease collecting piece 28 is of a barrel structure, the first-level grease collecting piece 28 is composed of a condensation fixing plate 281, a condensation blind plate 284 and a condensation side plate 282 connecting the condensation fixing plate 281 and the condensation blind plate 284, the condensation fixing plate 281 is connected with the condensation pipe degreasing box body 21, the condensation second-level air inlet pipe 253 penetrates through the condensation fixing plate 281 and extends towards the inside of the first-level grease collecting piece 28, a plurality of condensation through holes 283 are fixedly arranged on the condensation side plate 282, and liquid grease substances flow to the first-level grease collecting piece 28, then the mixture flows into a condensation collection cavity 291 of a secondary grease collection piece 29 through a condensation perforation 283, and simultaneously the temperature of the primary grease collection piece 28 and a condensation secondary air inlet pipe 253 are kept in the same temperature range through the condensation effect of a secondary condensation pipe 252, the mixture degreased by the condensation degreasing device is introduced into the primary grease collection piece 28, a condensation blind plate 284 is positioned in the flowing direction of the mixture, the mixture is blocked by the condensation blind plate 284, the running speed and the temperature are reduced, the state arranged in the mixture is condensed into a liquid state, the mixture flows to the secondary grease collection piece 29 through the condensation perforation 283, further, the mixture degreased by the condensation degreasing device can exchange heat with the primary grease collection piece 28 as far as possible, but does not directly flow to a condensation degreasing box body 21 through the condensation perforation 283, in the embodiment, the end face of the condensation secondary air inlet pipe 253 extending to the primary grease collection piece 28 is arranged as an inclined face, according to the vision angle of fig. 6, the inclined plane sets up to the acute angle with the up end of condensation second grade intake pipe 253 becomes the angle, and the inclined plane sets up to the obtuse angle with the lower terminal surface of condensation second grade intake pipe 253 becomes the angle, has effectively restricted the route that the mist upwards circulated to can make mist and one-level grease collect 28 and carry out abundant heat exchange, further degrease mist, improve degreasing efficiency.

When the liquid lipid substance in the secondary grease collecting piece 29 reaches a certain amount, the condensing pipe degreasing box body 21 is opened, the secondary grease collecting piece 29 is taken out, and the liquid lipid substance is uniformly collected into a designated container for uniform treatment; can be provided with the observation window on the condenser pipe degrease box 21, judge whether second grade grease collects piece 29 and need take out through visual observation, or set up level sensor in second grade grease collects piece 29, judge whether second grade grease collects piece 29 and need take out through the height of liquid lipid material, or set up weight sensor in second grade grease collects piece 29, judge whether second grade grease collects piece 29 and need take out through the weight of liquid lipid material, above-mentioned judgement mode is only partly, this system is suitable for all and can judges whether the liquid lipid material reaches the degree that needs second grade grease to collect piece 29 and take out the clearance.

The condenser pipe degreasing box body 21 is respectively provided with a tail gas discharge port 22 and a liquid discharge port 23 in a communicating manner, the liquid discharge port 23 is positioned below the condenser pipe degreasing box body 21, the tail gas discharge port 22 is positioned above the condenser pipe degreasing box body 21, and the tail gas discharge port 22 and the first-stage grease collecting part 28 are positioned on different sides of the condenser pipe degreasing box body 21, according to the visual angle shown in fig. 6, the first-stage grease collecting part 28 is positioned on the right side of the condenser pipe degreasing box body 21, the tail gas discharge port 22 is positioned on the left side of the condenser pipe degreasing box body 21, the flow path of the mixed gas is increased, so that the contact area between the mixed gas and the inner wall of the condenser pipe degreasing box body 21 is increased, the mixed gas is further degreased, the cleanliness of the discharged gas is improved, the tail gas discharge port 22 is communicated with the secondary primary valve 112 through a pipeline, the degreased gas flows along the secondary primary valve 112 through the tail gas discharge port 22, specifically, the mixed gas degreased by the first-stage grease collecting member 28 is diffused into the condenser pipe degreasing box 21 through the condensation through hole 283, the mixed gas is in contact with the inner wall of the condenser pipe degreasing box 21 to perform heat exchange, lipid substances in the mixed gas are condensed into liquid, the liquid lipid substances are discharged to a designated container through the liquid discharge port 23 to be uniformly processed, the further degreased gas is communicated from the tail gas discharge port 22 to a vacuum setting to prevent the lipid substances from accumulating in a pipeline and polluting the vacuum system 1, in the embodiment, the mixed gas is degreased by adopting a quadruple degreasing mode, one is degreased by a first-stage condensing mechanism, two is degreased by a second-stage condensing mechanism, three is degreased by the first-stage grease collecting member 28, four is degreased by the condenser pipe degreasing box 21, and a large amount of lipids in the mixed gas are degreased by the first-stage condensing mechanism and the second-stage condensing mechanism, the first-level grease collecting piece 28 and the condenser pipe degreasing box body 21 carry out degreasing treatment on a small amount of grease in the mixed gas degreased by the condensing degreasing device, so that the grease is effectively separated from gas, the cleanliness of the discharged gas is improved, and the pollution to equipment and the environment is reduced.

In this embodiment, the condensing tube degreasing box 21 has a condensing handle 213 fixed above it for easy transportation.

In this embodiment, condenser pipe degrease box 21 below is provided with condensation supporting component 211 and condensation rolling assembly 212, and condensation supporting component 211 and condensation rolling assembly 212 are provided with four groups respectively, lie in condenser pipe degrease box 21 respectively all around, and condensation supporting component 211 guarantees the steady support to condenser pipe degrease box 21, and condensation rolling assembly 212 guarantees the steady roll to condenser pipe degrease box 21 to be convenient for condenser pipe degrease box 21's removal.

As shown in fig. 8, the furnace body 7 includes a furnace door 71, a furnace chamber 72 and a furnace tail 73, the shells of the furnace door 71, the furnace chamber 72 and the furnace tail 73 respectively adopt a double-layer structure, specifically, the shells are divided into an outer layer positioned at the outer side and an inner layer positioned at the inner side, an interlayer is formed between the outer layer and the inner layer, the interlayer keeps a sealed state except for an inlet and an outlet, a cooling medium is introduced into the interlayer to ensure that the temperature rise of the outer surface of the furnace body is not more than 25 ℃, the cooling medium can adopt cooling water or gas as long as the cooling effect on the furnace body 7 can be realized, the inner layer adopts a vacuum airtight structure to ensure that the leakage rate of the furnace body 7 is not more than 1.3x10^-7Pa.L/s, the outer layer and the inner layer can be made of steel materials, a furnace chamber 74 is arranged in the furnace chamber 72, a temperature control system 3, a cooling system 4, a loading system 6 and other related equipment are arranged in the furnace chamber 74, the temperature control system 3 is arranged in the cooling system 4, the loading system 6 is arranged in the temperature control system 3, and the vacuum system 1, the process pipeline system 5 and other related equipment are arranged outside the furnace body 7, so that the occupied area of the equipment is reduced; a furnace body supporting frame 75 is fixedly arranged below the furnace body 7, and the furnace body supporting frame 75 is used for supporting the furnace body 7.

As shown in fig. 9, the temperature control system 3 includes a heat insulation assembly, a heating assembly and a water-cooled electrode 33, the heat insulation assembly includes a plurality of heat shields 31 arranged in a stacked manner, the heating assembly includes a plurality of heaters 32, the heating assembly is located in the heat insulation assembly, the heating assembly controls the temperature of a furnace chamber 74 in the furnace body 7, and the heat insulation assembly reflects the heat radiated by the heating assembly, prevents heat loss and reduces the temperature of the inner surface of the furnace chamber.

The heat insulation assembly comprises a heat insulation sealing cover 35, a heat insulation chamber 30 and a heat insulation mounting cover 37, the heat insulation sealing cover 35 is fixedly mounted at one end of the heat insulation chamber 30, the heat insulation mounting cover 37 is detachably mounted at the other end of the heat insulation chamber 30, the heat insulation sealing cover 35, the heat insulation chamber 30 and the heat insulation mounting cover 37 form a heat insulation cavity, and the heating assembly is mounted in the heat insulation cavity.

The heat insulation sealing cover 35, the heat insulation chamber 30 and the heat insulation mounting cover 37 are respectively stacked by a plurality of heat insulation screens 31, the shapes of the heat insulation screens 31 positioned at the positions of the heat insulation sealing cover 35, the heat insulation chamber 30 and the heat insulation mounting cover 37 are respectively matched with the shapes of the heat insulation sealing cover 35, the heat insulation chamber 30 and the heat insulation mounting cover 37, in the embodiment, the heat insulation chamber 30 adopts a cylindrical structure, the plurality of heat insulation screens 31 are sequentially stacked inwards along the radial direction of the heat insulation chamber 30, the heat insulation screens 31 adopt high temperature resistant materials, the heat radiated by the heater 32 is reflected back to the heat insulation cavity layer by layer to prevent heat dissipation, the outer surface of the heat insulation chamber 30 is provided with a plurality of heat insulation ring rods 301 along the axial direction, the radian of the outer surface of each heat insulation ring rod 301 is matched with the arc shape of the inner surface of the furnace chamber 74, the heat insulation ring rods 301 can enhance the stacking installation strength of the heat insulation screens 31 and ensure the stability, one end of the heat insulation chamber 30 is also provided with a heat insulation mounting angle 302, the insulating mounting angle 302 is used for mounting the insulating chamber 30 and the insulating mounting cover 37; the heat insulation chamber 30 is fixedly provided with a heat insulation mounting block 34, and the heat insulation mounting block 34 is used for mounting the temperature control system 3 and the inner surface of the hearth 72.

The heating assembly is located in the heat insulation cavity, the heater 32 is of a cylindrical structure, high-temperature resistance heating elements are adopted, such as nickel-chromium alloy, molybdenum, graphite, tungsten and the like, suitable materials can be selected according to different working temperatures of equipment, the heaters 32 are sequentially and uniformly distributed at intervals along the axial direction of the heat insulation chamber 30 to ensure uniform heat distribution in the heat insulation cavity, the heater 32 is fixedly connected with the heat shield 31 through a plurality of connecting and fixing devices 36, specifically, the connecting and fixing devices 36 are uniformly distributed along the circumferential direction of the heat insulation chamber 30 to ensure the mounting stability of the heater 32, each connecting and fixing device 36 comprises a connecting and fixing rod 362, according to the visual angle shown in figure 7, the upper end of each connecting and fixing rod 362 sequentially penetrates through the heat shield 31 upwards and extends to the outer side of the heat insulation chamber 30, the upper end of each connecting and fixing rod 362 is fixed on the outer surface of the heat insulation chamber 30 through corresponding fixing devices, and the lower end of each connecting and fixing rod 362 penetrates through the heater 32 and enables the corresponding fixing device to connect the upper end of each fixing rod 362 through the corresponding fixing device The lower end is fixed on the inner surface of the heater 32, further, the connecting fixing rod 362 is sleeved with a plurality of first locators 361 and second locators 363, the first locators 361 are positioned between the adjacent heat shields 31, the distance between the adjacent heat shields 31 is the same, the heat shields 31 can be conveniently installed, and the second locators 363 are positioned between the inner heat shields 31 and the heater 32, so that the distance between the heaters 32 and the heat shields 31 is kept constant.

The water-cooled electrode 33 sequentially penetrates through the hearth 72 and the heat insulation chamber 30 and is connected with the heater 32, the water-cooled electrode 33 is adopted to supply power to the heater 32 in the embodiment, and after the temperature of the water-cooled electrode 33 per se and the radiation temperature rises, the water-cooled electrode 33 is cooled by cooling water, so that the service life of the water-cooled electrode 33 can be effectively prolonged.

As shown in fig. 11 to 13, the cooling system 4 includes a hot air circulation mechanism including a fan 41 and an exhaust assembly, and a cooling mechanism including a heat exchanger 44, which discharges heat in the furnace chamber 74 out of the furnace body 7 through heat exchange.

The hot air circulation mechanism comprises a fan 41 and an exhaust assembly, the fan 41 is arranged in the furnace tail 73, the exhaust assembly is positioned in the furnace chamber 74, the exhaust assembly comprises a cold air distributor 42 and a cold air pipe 43, one side of the cold air distributor 42 is arranged with the fan 41, and the other side of the cold air distributor is arranged with the cold air pipe 43.

The cold air distributor 42 includes a cold air fixing end 421 and a cold air connecting end 422, the cold air fixing end 421 and the cold air connecting end 422 are integrally formed, the cold air fixing end 421 is connected with the fan 41, the cold air connecting end 422 is connected with the cold air pipe 43, and the cold air fixing end 421, the cold air connecting end 422 and the cold air pipe 43 form an air or nitrogen circulation channel.

In this embodiment, the width of the cold air connecting end 422 is greater than that of the cold air fixing end 421, the cold air connecting end 422 and the cold air fixing end 421 are formed in a shape like a Chinese character 'ji', a cold air distribution chamber 4211 is arranged in the cold air connecting end 422, the cold air distribution chamber 4211 is integrally designed in a cylindrical shape, the output end of the fan 1 is installed in the cold air distribution chamber 4211, a cold air chamber 4222 is arranged in the cold air connecting end 422, the cold air chamber 4222 is integrally designed in a circular ring shape, but the thickness of the cold air chamber 4222 is smaller compared with that of the cold air distribution chamber 4211, a relatively flat structure is formed, the cold air distribution chamber 4211 is communicated with the cold air chamber 4222, nitrogen is circulated from the cold air distribution chamber 4211 to the flat cold air chamber 4222, the nitrogen is compressed, the pressure of the nitrogen is increased, the air outlet speed of the nitrogen can be increased, the cold air connecting end 422 is further provided with a plurality of cold air communication holes 4221, the plurality of communication holes 4221 are annularly distributed in the circumferential direction of the cold air connecting end 422, the cold air communication hole 4221 is communicated with the cold air chamber 4222, the cold air pipe 43 is arranged in the cold air communication hole 4221, and the cold air distribution chamber 4211, the cold air chamber 4222, the cold air communication hole 4221 and the cold air pipe 43 form a nitrogen gas circulation channel.

The cold air distributor 42 further comprises a cold air mounting plate 423, the cold air mounting plate 423 is used for mounting a cooling mechanism, the cold air fixing end 421, the cold air connecting end 422 and the cold air mounting plate 423 are fixedly connected through a cold air connecting rod 424, and the cold air connecting rod 424 can be further used for enhancing the strength of the cold air distributor 42.

In this embodiment, a plurality of cold wind pipes 43 use cold wind distributor 42 axis to be the annular and distribute at cold wind pipe 43 circumferencial direction as the center, a plurality of cold wind pipes 43 form the cold wind that is used for placing temperature control system 3 and load the chamber, temperature control system 3 wholly is located cold wind loading intracavity promptly, cold wind pipe 43 distributes in the outside of thermal-insulated thorax 30, cold wind pipe 43 sets up to hollow tubular structure, cold wind pipe 43 intercommunication is provided with a plurality of cold wind outlet duct 431, cold wind outlet duct 431's export direction is loaded the chamber towards cold wind, cold wind pipe 43's one end and cold wind intercommunicating pore 4221 installation, cold wind pipe 43's the other end sets up to sealed end, thereby make nitrogen gas pass through cold wind outlet duct 431 to 74 blowout along the air current logical passageway, improve the blowout volume and the blowout speed of nitrogen gas, guarantee nitrogen gas spun homogeneity simultaneously.

The cooling mechanism comprises a heat exchanger 44, the heat exchanger 44 is arranged on a cold air mounting plate 423, the heat exchanger 44 is provided with a water cooling device, the water cooling device is provided with a water cooling inlet and a water cooling outlet 45, and the water cooling inlet and the water cooling outlet 45 extend to the outside of the furnace body 7 to realize water circulation.

In the implementation process of this embodiment, after the temperature control system 3 finishes heating, the fan 41 sends nitrogen into the furnace chamber 74 through the hot air circulation mechanism, after the nitrogen absorbs heat in the furnace chamber 74 to raise the temperature, under the action of the fan 41, the nitrogen transfers the heat to the water cooling device in the heat exchanger 44 through the heat exchanger 44, the heated cooling water transfers the heat to the outside of the furnace body 7 through the water cooling outlet 45, that is, the fan 41 carries out directional circulation on the nitrogen sent into the furnace chamber 74 in the furnace chamber 74, the heat exchanger 44 achieves the purpose of lowering the temperature of the furnace chamber 74 through the heat exchange effect, through the heat exchange structure of this embodiment, the uniformity of heat exchange in the furnace chamber 74 is ensured, the cooling speeds of workpieces at different positions are basically the same, the quality of the workpieces is effectively improved, and the cooling speed is kept at 50-100 ℃/h.

As shown in fig. 16 to 22, the terminal system 8 includes a base 81, a pressing plate 82, a limiting sleeve 83, a fastening sealing mechanism and a fixing sealing mechanism, the blower 41 includes an electrode 84, the limiting sleeve 83 and the base 81 are fixedly connected in a sealing manner by the fastening sealing mechanism, and the limiting sleeve 83 and the electrode 84 are fixedly connected in a sealing manner by the fixing sealing mechanism, so as to ensure the sealing performance.

In this embodiment, the base 81 is configured as a square structure, the base 81 is preferably made of stainless steel, the pressing plate 82 is configured as a square ring structure, the base 81 is provided with a plurality of fastening holes 813 distributed in a rectangular array, the pressing plate 82 is fixedly provided with connecting holes 821 opposite to the fastening holes 813 in position, the fastening holes 813 and the connecting holes 821 are in one-to-one correspondence, and the fastening members penetrate through the fastening holes 813 and the connecting holes 821 to fixedly connect the base 81 and the pressing plate 82.

According to the visual angle of fig. 20, the base 81 is provided with two sets of side surfaces which are bilaterally symmetrical, including a furnace cavity side 811 facing the furnace cavity 74 and a furnace tail side 812 facing the furnace tail 73, the pressure plate 82 is fixedly arranged on the furnace tail side 812 of the base 81, the base 81 is fixedly provided with a first installation cavity 814 and a second installation cavity 815 which are mutually communicated along the width direction, the first installation cavity 814 is communicated with the furnace cavity side 811, the second installation cavity 815 is communicated with the furnace tail side 812, the cross section of the first installation cavity 814 is square, the cross section of the second installation cavity 815 is circular, the size of the first installation cavity 814 is larger than that of the second installation cavity 815, the number of the first installation cavity 814 and the second installation cavity 815 is matched with the number of the electrodes 84, and the electrodes 84 are installed in the first installation cavity 814 and the second installation cavity 815.

The limiting sleeve 83 comprises a square end and a round end, the size of the square end is matched with that of the first mounting cavity 814, the radial size of the round end is matched with that of the second mounting cavity 815, the round end of the limiting sleeve 83 penetrates through the second mounting cavity 815 and extends towards the furnace tail side 812, the square end of the limiting sleeve 83 is aligned with the first mounting cavity 814, and the square end is mounted in the first mounting cavity 814, further, a ring cavity 832 is fixedly arranged on the square end, a first O-shaped ring 851 is sleeved in the ring cavity 832, in the embodiment, the first O-shaped ring 851 adopts the existing specification, preferably adopts the 25X3.55 specification, as shown in FIG. 20, the fastening and sealing mechanism is positioned at the furnace tail side 812 of the base 81, the fastening and sealing mechanism comprises a flat washer 861, a spring washer 862 and a thin nut 863, the flat washer 861, the spring washer 862 and the thin nut 863 are sequentially mounted on the round end of the limiting sleeve 83, and the regulating thin nut 863 fixedly connects the limiting sleeve 83 with the base 81, in this embodiment, the primary compression amount of the first O-ring 851 is set to be 0.6 to 0.8mm, the distance between the end surface of the square end of the position restricting sleeve 83 and the end surface of the furnace chamber side 811 of the base 81 is set to be h1, and h1 is preferably set to be 0.15 to 0.35mm, so that the sealing property between the position restricting sleeve 83 and the base 81 is ensured, the sealing property of the binding post is improved, and the maintenance and adjustment are facilitated.

A first through cavity 831 and a second through cavity 833 which are communicated with each other are fixedly arranged in the limiting sleeve 83, the first through cavity 831 penetrates through the square end of the limiting sleeve 83, the second through cavity 833 penetrates through the round end of the limiting sleeve 83, the radial dimension of the first through cavity 831 is smaller than that of the second through cavity 833, the electrode 84 comprises a flat end for screwing and a mounting end for mounting, the flat end is symmetrically and fixedly arranged at the two ends of the mounting end, the radial dimension of the first through cavity 831 is matched with that of the mounting end of the electrode 84, the electrode 84 penetrates through the first through cavity 831 and the second through cavity 833, the mounting end is arranged in the first through cavity 831 and the second through cavity 833, the flat end is respectively arranged at the outer sides of the square end and the round end face of the limiting sleeve 83, the limiting sleeve 83 and the electrode 84 are fixedly connected in a sealing way through a fixing sealing mechanism, the fixing sealing mechanism is arranged in a gap between the second through cavity 833 and the electrode 84, specifically, the fixed sealing mechanism comprises a second O-shaped ring 871, a spacer 872, a third O-shaped ring 873, a gasket 874 and an adjusting nut 875, the second O-shaped ring 871, the spacer 872, the third O-shaped ring 873, the gasket 874 and the adjusting nut 875 are sequentially mounted on the electrode 84, the fixed sealing mechanism is fixedly connected with the electrode 84 through the adjusting nut 875, and meanwhile, the sealing performance between the electrode 84 and the limiting sleeve 83 is ensured.

In this embodiment, the thin nut 863 and the adjusting nut 875 are adjusted, so as to ensure the sealing requirement of the system after the wiring terminal of the blower 41 is used for a period of time.

In this embodiment, the binding post of the blower 41 is installed on a flange outside a furnace chamber (not shown in the figure) through a sealing rubber ring (not shown in the figure), the motor (not shown in the figure) is installed inside the furnace chamber, a motor connecting terminal (not shown in the figure) is connected with one end of a binding post electrode 84 of the blower 41 inside the chamber through a cable, one end of the binding post electrode 84 of the blower 41 outside the chamber is connected with a power supply line (not shown in the figure), and a power supply is transmitted to the motor inside the furnace chamber through the electrode 84, so that the evaporation amount of grease in the sealing material in the furnace chamber is reduced, the pollution to the furnace chamber is reduced, and the manufacturing and using costs are reduced.

For guaranteeing fan 41 terminal off-the-shelf gas tightness and insulating nature, conventional gas tightness and insulating nature test need be done to fan 41 terminal, this embodiment, be connected through stop collar 83 between base 81 and electrode 84, and stop collar 83 and base 81 seal through fastening sealing mechanism and set firmly the connection, stop collar 83 and electrode 84 seal through fixed sealing mechanism and set firmly the connection, realize the gas tightness and the insulating nature of fan 41 terminal according to above-mentioned structure, the qualification standard of conventional experiment is preferred, whole leak rate: not more than 1.3x10-7Pa.L.S-1, and the insulation between electrodes is not less than 2 MOmega; the fan 41 terminal is installed on the experimental cavity flange, and is sealed with the cavity through the O-shaped ring on the cavity flange, leak rate: not more than 1.3x10-7Pa.L.S-1, and not less than 1M omega insulated from furnace chamber(ii) a The electrodes are powered, the voltage between the electrodes is set to be AC380V, the test cavity is vacuumized to 10 < -3 > to 10%^-4Pa, continuously electrifying for 30min, and avoiding the phenomenon of inter-electrode vacuum discharge.

As shown in fig. 14, the process piping system 5 includes a vacuum release circuit, a nitrogen injection circuit, and a process gas injection circuit, the vacuum release circuit, the nitrogen injection circuit, and the process gas injection circuit are respectively used for different processes of the furnace body 7, the vacuum release circuit includes a vacuum release valve 512, the nitrogen injection circuit includes a nitrogen injection valve 533, the process gas injection circuit includes a process gas injection valve 541, and the vacuum release valve 512, the nitrogen injection valve 533, and the process gas injection valve 541 control the processes of the furnace body 7.

The process pipeline system 5 is installed on the side of the furnace body 7, the process pipeline system 5 comprises a process display panel 544, the process display panel 544 is installed on the outer side of the furnace body 7, the process pipeline system 5 further comprises a gas port 52 and a process gas port 54 which are communicated with the furnace body 7, the vacuum release loop and the nitrogen injection loop are communicated with the furnace chamber 74 of the furnace body 7 through the gas port 52, the vacuum state of the furnace body 7 is released, the nitrogen injection process is realized, the process gas injection loop is communicated with the furnace chamber 74 of the furnace body 7 through the process gas port 54, and the purpose of injecting the process gas into the furnace chamber 74 is realized.

The vacuum release loop comprises a vacuum release valve 512 and a vacuum air filter 510, the vacuum release valve 512 and the vacuum air filter 510 are communicated through a first vacuum pipeline 511, the vacuum release valve 512 is communicated with the gas port 52 through a second vacuum pipeline 513, the vacuum air filter 510, the first vacuum pipeline 511, the vacuum release valve 512, the second vacuum pipeline 513 and the gas port 52 form a vacuum release gas flow path, the vacuum release valve 512 controls the opening and closing of the vacuum release gas flow path, when the workpiece is to be taken out of the furnace after being subjected to heat treatment and cooling treatment, after the vacuum release valve 512 is opened, the vacuum gas is conveyed to the furnace chamber 74 of the furnace body 7 along the vacuum release gas flow path, so that the vacuum state in the furnace chamber 74 is released, and the furnace door is opened.

The nitrogen gas injection circuit comprises a gas injection port 53 and a nitrogen gas injection valve 533, wherein the gas injection port 53 is communicated with the nitrogen gas injection valve 533 through a first nitrogen gas pipeline 531, the nitrogen gas injection valve 533 is communicated with the gas port 52 through a second nitrogen gas pipeline 534, a nitrogen gas injection vacuum table 535 is arranged on the first nitrogen gas pipeline 531, the gas injection port 53, the first nitrogen gas pipeline 531, the nitrogen gas injection valve 533, the second nitrogen gas pipeline 534 and the gas port 52 form a nitrogen gas injection gas flow path, when the furnace body 7 needs nitrogen gas injection, the nitrogen gas injection valve 533 is opened, nitrogen gas is introduced into the furnace chamber 74 of the furnace body 7 along the nitrogen gas injection gas flow path, the purpose of nitrogen gas input is realized, and the input amount of the nitrogen gas is controlled through the nitrogen gas injection vacuum table 535.

The process gas injection loop comprises a process gas pipeline 545 and a process gas injection valve 541, one end of the process gas pipeline 545 is communicated with the gas injection port 53, the other end of the process gas pipeline is communicated with the process gas injection valve 541, the outlet end of the process gas injection valve 541 is communicated with the process gas port 54, the gas injection port 53, the process gas pipeline 545, the process gas injection valve 541 and the process gas port 54 form a process gas flow path, when the furnace body 7 is subjected to process treatment, the process gas injection valve 541 is opened, and the process gas is introduced into the furnace body 7 along the process gas flow path, so that the purpose of inputting the process gas is realized; the process gas line 545 is installed at the process display panel 544, and the process gas line 545 is provided with an inlet switch 544, a pressure reducing valve 543, and a vacuum gauge 542 installed at the process display panel 544 to control the input amount and the input speed of the process gas.

The vacuum release valve 512, the nitrogen injection valve 533 and the process gas injection valve 541 adopt high-vacuum pneumatic baffle valves as switching valves of each loop, and the nitrogen is fed into the furnace body 7 or the vacuum in the furnace is released through the opening of the vacuum release valve 512, the nitrogen injection valve 533 and the process gas injection valve 541 so as to open a furnace door; or the process gas is fed into the furnace, thereby realizing different process requirements.

In this embodiment, the gas injection port 53 is connected to a nitrogen gas supply device and a process gas supply device, respectively, and delivers nitrogen gas to the nitrogen gas injection circuit or process gas to the process gas injection circuit according to process requirements.

As shown in fig. 15, the loading system 6 includes a lifting structure 61 and a graphite box 62, the lifting structure 61 includes a lifting power mechanism 611 and a top cover 613, the graphite box 62 is fixedly provided with an observation hole 64, the workpiece is installed in the graphite box 62, the lifting power mechanism 611 controls the top cover 613 to move for sealing or separating from the observation hole 64, and the observation hole 64 is used for observing whether the workpiece in the graphite box 62 is installed in place.

The lifting mechanism 61 comprises a lifting power mechanism 611 and a top cover 613, the lifting power mechanism 611 comprises a lifting rod 612, the top cover 613 is fixedly arranged on the end face of the lifting rod 612, and the lifting power mechanism 611 controls the movement of the top cover 613 in the vertical direction by driving the lifting rod 612 to lift.

Graphite box body 62 sets up to the box structure of assembling through a plurality of laps, and realize graphite box body 62's encapsulation through door 622, door 622 and graphite box body 62 demountable installation, the installation direction of door 622 is the direction of work piece business turn over graphite box body 62, door 622 specifically realizes demountable installation through door depression bar 624 with graphite box body 62, specifically, graphite box body 62 is last to have set firmly the installation piece 623 of two sets of symmetries, the installation piece 623 is last to have set firmly installation card chamber 6231, the both ends symmetry of door depression bar 624 has set firmly depression bar notch 6241, depression bar notch 6241 and installation card chamber 6231 cooperate, realize door depression bar 624 and installation piece 623 lock installation, thereby compress tightly door 622 on graphite box body 62 through door depression bar 624, the overall structure is simple, and convenient operation.

In this embodiment, the observation hole 64 is located in the cover plate above the graphite box 62, the size of the observation hole 64 is smaller than that of the top cover 613, and the top cover 613 can completely seal the observation hole 64, so that a sealed box is formed inside the graphite box 62.

The graphite box body 62 is further provided with an exhaust valve 63, the exhaust valve 63 is preferably arranged on a cover plate above the graphite box body 62, when the vacuum degree in the graphite box body 62 is greater than the vacuum degree of the heat insulation cavity, the exhaust valve 63 is opened, and the gas in the graphite box body 62 is discharged to the cavity.

In this embodiment, the cover plate and the cover door 622 are made of isostatic graphite material.

In this embodiment, the loading system 6 is installed in the heat insulation cavity of the temperature control system 3, the lifting power mechanism 611 is installed on the outer surface of the hearth 72 of the furnace body 7, the lifting rod 612 sequentially penetrates through the hearth 72 and the heat insulation chamber 30 and extends into the heat insulation chamber, the lifting rod 612 is slidably connected with the hearth 72 and the heat insulation chamber 30, and the lifting power mechanism 611 drives the lifting rod 612 to lift the control top cover 613 and keep the sealing state or the separation state with respect to the observation hole 64.

In the implementation process of the invention, the nitrogen injection loop injects nitrogen into the furnace chamber 74 of the furnace body 7 for purging, the workpiece is placed in the graphite box body 62, the furnace body 7 is vacuumized by the vacuum system 1, and the vacuum degree of the furnace chamber 74 is ensured to be kept at 10^-3～ 10^-4Pa, the temperature control system 3 heats the furnace chamber 74, the process gas injection loop injects process gas into the furnace chamber 74 to perform heat treatment on the workpiece, the mixed gas mixed with the binder and the forming agent is extracted to the degreasing mechanism of the vacuum system 1 to perform degreasing treatment, so that pollution to the furnace chamber 72 is reduced, after the workpiece is subjected to heat treatment, the cooling system 4 is started to effectively control the cooling speed of the workpiece, ensure the consistency of the cooling speed of the workpiece, improve the production efficiency, after the workpiece is cooled to the process set temperature, the vacuum relieving loop transmits vacuum air to the furnace chamber 74, relieves the vacuum state in the furnace chamber 74, opens the furnace door 71, takes out the graphite box body 62 loaded with the workpiece, removes the cover door pressing rod 624, and takes out the workpiece.

It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

Claims (10)

1. Vacuum brazing stove, its characterized in that: the vacuum furnace comprises a vacuum system, a condensation degreasing system and a furnace body, wherein a temperature control system is arranged in the furnace body, a cooling system, a process pipeline system, a loading system and a wiring terminal system, the vacuum system at least comprises a primary vacuum pipeline, a secondary vacuum pipeline and a tertiary vacuum pipeline, the primary vacuum pipeline, the secondary vacuum pipeline and the tertiary vacuum pipeline control the furnace body pressure in different process stages, the condensation degreasing system comprises a condensation degreasing device and a grease collecting device, the condensation degreasing device comprises a primary condensation mechanism and a secondary condensation mechanism, the grease collecting device comprises a primary grease collecting piece and a secondary grease collecting piece, mixed gas is degreased sequentially through the primary condensation mechanism and the secondary condensation mechanism, and grease substances are collected through the primary grease collecting piece and the secondary grease collecting piece; the temperature control system comprises a heat insulation assembly, a heating assembly and a water-cooling electrode, and is used for heating the workpiece; the heat insulation assembly comprises a heat insulation sealing cover, a heat insulation chamber, a heat insulation mounting cover and a plurality of heat shields arranged in a stacked mode, the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover are arranged in the stacked mode through the plurality of heat shields respectively, a plurality of heat insulation ring rods are arranged on the outer surface of the heat insulation chamber in the axial direction, the radian of the outer surface of each heat insulation ring rod is matched with the arc of the inner surface of the furnace chamber, the heat insulation ring rods enhance the strength of the stacked installation of the heat shields, the heating assembly comprises a plurality of heaters, the heating assembly is located in the heat insulation assembly and controls the temperature of the furnace chamber in the furnace body, the heaters are of a cylindrical structure and are sequentially arranged in the axial direction of the heat insulation chamber at intervals, the heaters are fixedly connected with the heat shields through a plurality of connecting and fixing devices, the heat radiated by the heating assembly is reflected by the heat insulation assembly to prevent heat dissipation, and water-cooled electrodes sequentially penetrate through the furnace chamber of the furnace body, The cooling system comprises a hot air circulation mechanism and a cooling mechanism, the hot air circulation mechanism comprises a fan and an exhaust assembly, the exhaust assembly comprises a cold air distributor and a cold air pipe, one side of the cold air distributor is installed with the fan, the other side of the cold air distributor is installed with the cold air pipe, the cold air pipes are annularly distributed in the circumferential direction of the cold air pipe by taking the axis of the cold air distributor as the center, the cold air pipes form a cold air loading cavity for placing the temperature control system, the cold air pipes are distributed outside the heat insulation chamber, the cold air pipes are arranged in a hollow tubular structure, the cold air pipes are communicated with a plurality of cold air outlet pipes, the outlet directions of the cold air outlet pipes face the cold air loading cavity, the cooling mechanism comprises a heat exchanger, and the heat in the furnace body is discharged out of the furnace body through heat exchange by the hot air circulation mechanism and the cooling mechanism, the cooling system is used for cooling the workpiece; the process pipeline system comprises a vacuum release loop, a nitrogen injection loop and a process gas injection loop, wherein the vacuum release loop, the nitrogen injection loop and the process gas injection loop are respectively used for different processes of the furnace body, the vacuum release loop comprises a vacuum release valve, the nitrogen injection loop comprises a nitrogen injection valve, and the process gas injection loop comprises a process gas injection valve, a vacuum release valve, a nitrogen injection valve and a process gas injection valve which control the processes of the furnace body; the loading system is used for loading workpieces.

2. The vacuum brazing furnace according to claim 1, wherein: the primary vacuum pipeline comprises a primary pump, a primary valve, a secondary primary valve, a tertiary primary valve and a tail box, the secondary vacuum pipeline comprises a secondary pump, a primary secondary valve, a secondary valve and a tertiary secondary valve, the tertiary vacuum pipeline comprises a main pump and a main valve, the main valve is fixedly arranged on the upper side of the main pump and is communicated with the main pump through an air inlet pipe, the main valve is communicated with the furnace body through an air inlet pipe, the parts of the primary vacuum pipeline, the secondary vacuum pipeline and the tertiary vacuum pipeline are communicated through pipelines, the tail box is communicated with the primary pump, the tertiary primary valve is communicated with the air inlet pipe through a pipeline, the secondary primary valve is connected with the primary pump through a pipeline, the tertiary primary valve is connected with the primary pump through a pipeline, the secondary primary valve is connected with the air outlet end of a condensation degreasing system, the air inlet end of the condensation degreasing system is connected with the furnace body, the condensation degreasing system and the secondary primary valve form mixed gas which is introduced and degreased by the condensation degreasing system, The furnace body, the condensation degreasing system, the secondary primary valve, the primary pump and the tail box form a primary pressure control passage, and the pressure range is set to be 1-10 Pa.

3. The vacuum brazing furnace according to claim 2, wherein: the secondary valve is communicated with the main valve through a pipeline, the secondary valve is communicated with the secondary pump through a pipeline, the secondary pump is communicated with the primary valve, the primary valve is communicated with the primary pump, the furnace body, the air inlet pipe, the main valve, the secondary valve, the secondary pump, the primary valve, the primary pump and the tail box form a secondary pressure control passage, the secondary pump and the primary pump control the pressure of the furnace body, and the pressure range is set at 10^-1-10^-2Pa, primary and secondary valveThe main pump, the secondary pump and the primary pump control the pressure of the furnace body, the pressure range is set at 10, the pressure range is set at^-3-10^-4Pa。

4. The vacuum brazing furnace according to claim 1, wherein: the primary condensation mechanism is arranged to be an inclined structure and is communicated with the furnace body through a gas inlet assembly, mixed gas circulates to the primary condensation mechanism through the gas inlet assembly, the primary condensation mechanism comprises a primary condensation pipe and a condensation primary gas inlet pipe, the condensation primary gas inlet pipe is communicated with the secondary condensation mechanism, a primary cooling medium inlet and a primary cooling medium outlet of the primary condensation pipe are positioned outside the condensation primary gas inlet pipe, and the primary condensation pipe converts the state of lipid substances in the mixed gas into a liquid state and a solid state through cooling media; second grade condensation mechanism includes second grade condenser pipe and condensation second grade intake pipe, condensation second grade intake pipe and grease collection device intercommunication, condensation one-level intake pipe and condensation second grade intake pipe intercommunication, second grade cooling medium entry and the second grade cooling medium export of second grade condenser pipe are located condensation second grade intake pipe outside, the second grade condenser pipe is liquid and solid-state through the lipid matter state transformation of cooling medium in with the mist, the mist is through further degrease through second grade condensation mechanism after the partial degrease of one-level condensation mechanism.

5. The vacuum brazing furnace according to claim 4, wherein: grease collection device includes condenser pipe degrease box, sets up one-level grease collection piece and second grade grease collection piece in the condenser pipe degrease box, and one-level grease collection piece is located the top that the piece was collected to the second grade grease, and both intercommunications, and the piece is collected to the one-level grease and the condensation second grade intake pipe intercommunication of second grade condensation mechanism, and liquid lipid material and mist and the liquid lipid material of one-level grease collection piece heat exchange condensation are through perforation flow direction second grade grease collection piece.

6. The vacuum brazing furnace according to claim 1, wherein: the furnace body comprises a furnace door, a furnace chamber and a furnace tail, the shells of the furnace door, the furnace chamber and the furnace tail are respectively of a double-layer structure, the shells comprise an outer layer and an inner layer, the outer layer is positioned on the outer side, the inner layer is positioned on the inner side, an interlayer is formed between the outer layer and the inner layer, a cooling medium is introduced into the interlayer, the temperature rise of the outer surface of the furnace body is controlled not to be more than 25 ℃, the inner layer is of a vacuum airtight structure, the leakage rate of the furnace body is controlled not to be more than 1.3x10^-7Pa.L/s, the outer layer and the inner layer are made of steel materials, and a furnace chamber is arranged in the furnace chamber.

7. The vacuum brazing furnace according to claim 1, wherein: the heat insulation sealing cover is fixedly arranged at one end of the heat insulation chamber, the heat insulation mounting cover is detachably arranged at the other end of the heat insulation chamber, the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover form a heat insulation cavity, the heating assembly is arranged in the heat insulation cavity, the shapes of heat shields positioned at the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover are respectively matched with the shapes of the heat insulation sealing cover, the heat insulation chamber and the heat insulation mounting cover, and a plurality of heat shields of the heat insulation chamber are sequentially inwards laminated along the radial direction of the heat insulation chamber; the loading system comprises a lifting structure and a graphite box body, the lifting structure comprises a lifting power mechanism and a top cover, the graphite box body is fixedly provided with an observation hole, a workpiece is installed in the graphite box body, the lifting power mechanism controls the top cover to move and is used for sealing or keeping away from the observation hole, and the observation hole is used for observing the workpiece in the graphite box body.

8. The vacuum brazing furnace according to claim 1, wherein: the wiring terminal system comprises a base, a pressing plate, a limiting sleeve, a fastening sealing mechanism and a fixing sealing mechanism, the fan comprises an electrode, the limiting sleeve and the base are fixedly connected in a sealing mode through the fastening sealing mechanism, and the limiting sleeve and the electrode are fixedly connected in a sealing mode through the fixing sealing mechanism.

9. The vacuum brazing furnace according to claim 8, wherein: the base is provided with a plurality of groups of fastening holes distributed in a rectangular array, the pressing plate is fixedly provided with connecting holes opposite to the fastening holes, the fastening holes correspond to the connecting holes one by one, and the fastening pieces penetrate through the fastening holes and the connecting holes to fixedly connect the base and the pressing plate; the base comprises a furnace cavity side facing the furnace cavity and a furnace tail side facing the furnace tail, the pressing plate is fixedly arranged on the furnace tail side of the base, the base is fixedly provided with a first mounting cavity and a second mounting cavity which are communicated with each other, the first mounting cavity is communicated with the furnace cavity side, the second mounting cavity is communicated with the furnace tail side, and the electrodes are arranged in the first mounting cavity and the second mounting cavity; the limiting sleeve comprises a square end and a round end, the round end of the limiting sleeve penetrates through the second mounting cavity, the square end of the limiting sleeve is mounted in the first mounting cavity, the square end is fixedly provided with an annular cavity, a first O-shaped ring is sleeved in the annular cavity, the fastening and sealing mechanism comprises a flat washer, a spring washer and a thin nut, the flat washer, the spring washer and the thin nut are sequentially mounted on the limiting sleeve, and the limiting sleeve is fixedly connected with the base through the thin nut; the electrode is characterized in that a first through cavity and a second through cavity which are communicated with each other are fixedly arranged in the limiting sleeve, the first through cavity penetrates through the square end of the limiting sleeve, the second through cavity penetrates through the round end of the limiting sleeve, the electrode comprises a flat end used for screwing and a mounting end used for mounting, the flat end is symmetrically fixedly arranged at two ends of the mounting end, the electrode penetrates through the first through cavity and the second through cavity, the mounting end is located in the first through cavity and the second through cavity, the flat end is respectively located on the outer sides of the end faces of the square end and the round end of the limiting sleeve, the fixed sealing mechanism is located in a gap between the second through cavity and the electrode, the fixed sealing mechanism comprises a second O-shaped ring, a spacer sleeve, a third O-shaped ring, a gasket and an adjusting nut, the second O-shaped ring, the spacer sleeve, the third O-shaped ring, the gasket and the adjusting nut are sequentially arranged on the electrode, and the fixed sealing mechanism is fixedly connected with the electrode through the adjusting nut.

10. The vacuum brazing furnace according to claim 1, wherein: the vacuum system also comprises a pressure maintaining mechanism, the pressure maintaining mechanism comprises a maintaining pump, the maintaining pump is respectively communicated with the three-stage secondary valve and the tail box through pipelines, a pressure maintaining passage is formed by the furnace body, the air inlet pipe, the main valve, the main pump, the three-stage secondary valve, the maintaining pump and the tail box, and the maintaining pump maintains the pressure range at 10^-3-10^-4Pa。

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