WO2018152973A1

WO2018152973A1 - Phase change insulating paper drying mechanism and drying method thereof

Info

Publication number: WO2018152973A1
Application number: PCT/CN2017/083670
Authority: WO
Inventors: 闾传胪; 李振泉; 王金俊; 闾惠
Original assignee: 南通中菱绝缘材料有限公司
Priority date: 2017-02-21
Filing date: 2017-05-09
Publication date: 2018-08-30

Abstract

Disclosed are a phase change insulating paper drying mechanism and drying method thereof. The drying mechanism comprises a drying box body, wherein the drying box body is connected at the bottom with a wood pulp drying platform. The wood pulp drying platform comprises a board (5) used for laying out a wood pulp layer. The board (5) is provided with a water discharge hole (10) and provided on the bottom face with a water penetration board made of a porous hard material. The drying box body is also connected at the bottom with a dehumidifying plunger mechanism; a top cover (1) is connected with an evaporation plate (7) by means of an annular support frame (16) and the surface of the evaporation plate (7) is provided with several air discharge holes in an array; the top cover (1) is also connected with a heating mechanism, wherein the heating mechanism comprises several heat-exchange air cylinders (17), and the heat-exchange air cylinders (17) are connected with an air input nozzle (19); and a side wall of a connection frame (2) is connected with an air outlet nozzle. The mechanism uses a negative pressure cavity, which can be vacuum-pumped, and uses the principle that the boiling point of water is lower under low air pressure to make the water in the wood pulp generate phase change rapidly and then evaporate by means of vacuum-pumping, which has the advantages of a shorter drying time, does not tend to scorch and a higher drying uniformity.

Description

Phase change type insulating paper drying mechanism and drying method thereof

[0001] The present invention relates to a phase change type insulating paper drying mechanism and a drying method thereof, and belongs to the field of insulating paper manufacturing equipment.

Background technique

[0002] In the production process of insulating paper, the main purpose is to press the wood pulp by forming rolls, and then dry it by the relevant drying mechanism, and finally to make the paperboard, but the process is only suitable for thin cardboard, thick cardboard. It is easy to dry unevenly or partially dry too much, so a special equipment is needed to achieve the drying of thick cardboard.

technical problem

The technical problem to be solved by the present invention is: To overcome the technical problem that the thick insulating paper is not easily uniformly dried in the prior art, a phase change type insulating paper drying mechanism and a drying method thereof are provided.

Problem solution

Technical solution

[0004] The technical solution adopted by the present invention to solve the technical problem thereof is:

[0005] A phase change type insulating paper drying mechanism includes a drying box body, a base located on a bottom wall surface of a drying box body, a top cover located on a top wall surface of the drying box body, and a side of the drying box body a connection frame of a wall; wherein a wood pulp drying platform is connected to the base through a plurality of connecting columns, the wood pulp drying platform comprises a flat plate for spreading a wood pulp layer, and a shaped protrusion is arranged around the flat plate a drain hole is disposed on the flat plate, and a water seepage plate made of a porous hard material is disposed on a bottom surface of the flat plate, and an edge of the water seepage plate is in close contact with an inner wall of the positioning protrusion, and the drying platform is further passed through The hard drain pipe is connected with a dehumidifying piston mechanism, and the dehumidifying piston mechanism is located on the outer side wall of the base corresponding to the drying box; the top cover is connected with an evaporation plate through an annular support frame, and the evaporation plate is adopted Made of a heat conductive metal plate, the array of the surface of the evaporation plate is provided with a plurality of vent holes, the contour of the evaporation plate corresponding to the contour of the water permeable plate; on the top cover Heating means connected to said heating means comprises a plurality of heat exchanger duct, the heat exchanger duct is fixed to the cover, one end of the heat exchanger duct extends into the support frame The other end is connected with an air inlet nozzle, a check valve A is connected to the air inlet nozzle, and a heat generating sleeve is fixed on the inner wall of the heat exchange air cylinder; a one-way valve B is connected to the exhaust nozzle; the dehumidifying piston mechanism includes a cylinder body, and a floating piston is disposed in the cylinder body, and one end of the cylinder body is connected to the hard drainage a pipe is further disposed on one end of the cylinder connected to the hard drain pipe, the drain valve is a one-way valve, and the other end of the cylinder is connected to a vacuum pump, in the hard A check valve C is connected to the drain pipe.

[0006] As a further innovation of the present invention, the evaporation plate includes a bottom plate and a top plate, wherein the top plate and the bottom plate are both plate-like structures, and vent holes are arranged on the bottom plate and the top plate, the top plate and The bottom plates are fixedly connected by a plurality of connecting columns disposed between the exhaust holes.

[0007] As a further innovation of the present invention, the connecting post is fixedly connected to the bottom plate and the top plate by brazing.

[0008] As a further innovation of the present invention, the top of the edge of the shaped protrusion is provided with a guiding surface of an inclined structure, and the evaporation plate and the supporting frame are connected by an annular fixing frame, and the fixing frame is made of copper. A positioning surface corresponding to the guiding surface is disposed at an outer edge of the fixing frame.

[0009] As a further innovation of the present invention, the porous hard material is made of clay sintered.

[0010] As a further innovation of the present invention, the inner wall of the heat generating sleeve is provided with a spiral heat transfer fin, and a plurality of heat generating resistor wires are embedded in the heat generating sleeve.

[0011] As a further innovation of the present invention, the heat-generating sleeve is inserted into one end of the support frame to fix a dust-proof net cover.

[0012] As a further innovation of the present invention, the drying box is connected to the work surface through a frame, the connecting frame is fixedly connected to the frame, and the base is pressed by a telescopic cylinder fixed to the frame. Go to the connection box.

[0013] A method for drying a phase change type insulating paper drying mechanism,

[0014] 1, the wood pulp is flattened to the water seepage plate, and scraped flat by the scraper, the base and the top cover are returned to the connection frame

, causing the evaporation plate to be pressed onto the wood pulp on the surface of the water seepage plate;

[0015] 2, start the dehumidification piston mechanism, the majority of the water in the wood pulp through the cylinder of the dehumidification piston mechanism sequentially through the micropores of the water seepage plate, the check valve C is drawn into the cylinder, and then reverse drive a floating piston in the cylinder, the shut-off valve C is closed, and the water in the cylinder is discharged through the snoring drain valve;

[0016] 3. Injecting air into the drying box through the one-way valve A, and injecting the air through the heat exchange air cylinder Heating, hot air passes through the wood pulp, water seepage plate, drainage hole in turn, and the same exhaust valve starts to draw the relatively low temperature air from the drying box until the temperature in the drying box reaches 50 ° C to 70 ° C;

[0017] 4, then close the air inlet nozzle, the heat pipe sleeve in the heat exchange air cylinder continues to heat, while the same drive continues to drive the vacuum on the exhaust nozzle, so that the pressure in the drying box is reduced, so that in the drying box The pressure is at least 10% below the standard atmospheric pressure until the temperature in the drying chamber reaches 70 ° C to 95 ° C. This is because the pressure is reduced and the moisture contained in the wood pulp evaporates rapidly from 70 ° C to 95 ° C. ;

[0018] 5, close the check valve B, start the vacuum pump connected to the cylinder, the piston moves along the cylinder, the remaining water vapor and air in the drying tank is discharged into the cylinder through the check valve C, Finally close the vacuum pump, check valve

C is closed and the humid air is discharged into the external environment through the drain valve.

Advantageous effects of the invention

Beneficial effect

[0019] 1. The invention adopts a vacuum chamber capable of vacuuming, and utilizes the principle that the boiling point (evaporation point) of water is relatively low under low pressure, and the water in the wood pulp is rapidly obtained by vacuuming. A phase change occurs, which in turn evaporates. It has the advantages of short drying time, difficulty in occurrence of coke, and high uniformity of drying.

[0020] 2. The evaporation plate adopts a double-layer plate structure with a large hollowness. Compared with the single-layer plate structure, the heat transfer effect of the evaporation plate of the structure is poor, and the coke of the surface of the evaporation plate is not easy to occur. The 吋 structure ensures the boring degree while ensuring the strength of the evaporation plate.

[0021] The fixing method of brazing has good strength and the welding process is relatively simple.

[0022] The cooperation of the guide surface and the positioning surface of the bow I can ensure the parallelism of the bonding between the evaporation plate and the water seepage plate, and prevent the uneven thickness of the insulating paper produced.

[0023] 3. Porous hard material of clay sintered material has good surface finish and high temperature tolerance.

[0024] 4. The heat transfer fins effectively improve the heat conduction efficiency.

[0025] 5. The drying box is connected by a movable frame. After the drying is completed, the bottom plate can be conveniently removed from the connection frame of the drying box by the telescopic cylinder to take out the paper.

Brief description of the drawing

DRAWINGS

The invention is further described below in conjunction with the drawings and embodiments.

1 is a schematic structural view of the present invention; [0028] In the figure: 1, the top cover; 2, the connection frame; 3, the base; 4, the connecting column; 5, the plate; 6, the shaped protrusion; 7, the evaporation board; 8, the fixed frame; 9, hard drainage 10; drainage hole; 11, cylinder; 12, floating piston; 13, vacuum machine; 14, drain valve; 15, check valve C; 16, support frame; 17, heat transfer air cylinder; Set; 19, air inlet; 20, dust net cover.

BEST MODE FOR CARRYING OUT THE INVENTION

The invention will now be described in further detail with reference to the drawings. The drawings are simplified schematic diagrams, and only the basic structure of the invention is illustrated in a schematic manner, and thus only the configurations related to the present invention are shown.

[0030] As shown in FIG. 1 , the present invention is a phase change type insulating paper drying mechanism, comprising a drying box body, the drying box body is located on a bottom wall of the drying box body, and is located on the top wall surface of the drying box body. a top cover, and a connecting frame constituting a side wall surface of the drying box; wherein a wood pulp drying platform is connected to the base through a plurality of connecting columns, the wood pulp drying platform comprises a flat plate for spreading the wood pulp layer, A sizing protrusion is arranged around the flat plate, a drainage hole is arranged on the flat plate, and a water permeable plate made of clay is arranged on the bottom surface of the flat plate, and the edge of the water permeable plate is in close contact with the inner wall of the positioning protrusion. The drying platform is further connected with a dehumidifying piston mechanism through a hard drain pipe, and the dehumidifying piston mechanism is located on the outer side wall of the corresponding drying box body; the top cover is connected by an annular support frame and has an evaporation a plate, the evaporation plate and the support frame are connected by an annular fixing frame, the fixing frame is made of copper, and the outer edge of the fixing frame Positioning opposing surface, a top edge of said shaped projection is provided with an inclined face of the positioning structure I should bow guide surface;

[0031] The evaporation plate is made of stainless steel, the evaporation plate includes a bottom plate and a top plate, wherein the top plate and the bottom plate are both plate-like structures, and exhaust holes are arranged on the bottom plate and the top plate. The top plate and the bottom plate are fixedly connected by brazing through a plurality of connecting posts disposed between the exhaust holes, the contour of the evaporation plate corresponding to the contour of the water seepage plate; and a heating mechanism connected to the top cover, The heating mechanism comprises a plurality of heat exchange air cylinders, wherein the heat exchange air cylinder is fixed on the top cover, one end of the heat exchange air cylinder extends into the support frame, and the heat generating sleeve extends into the support frame at one end and is fixed with an anti-proof a dust net cover is connected to the other end with an air inlet nozzle, a check valve A is connected to the air inlet nozzle, and a heat generating sleeve is fixed on the inner wall of the heat exchange air tube, and the inner wall of the heat generating tube sleeve is provided with a spiral a heat-conducting fin having a plurality of heating resistor wires embedded in the heating sleeve; a discharge nozzle is connected to the side wall of the connecting frame, and a single nozzle is connected to the exhaust nozzle a valve B; the dehumidifying piston mechanism includes a cylinder in which a floating piston is disposed, one end of the cylinder is connected to the hard drain pipe, and the cylinder is connected to the hard drain pipe One end of the cylinder is also provided with a drain valve, the drain valve is a one-way valve, and the other end of the cylinder is connected to a vacuum pump, and a check valve C is connected to the hard drain pipe.

[0032] The drying box is connected to the working surface through a frame, and the connecting frame is fixedly connected to the frame, and the base is pressed onto the connecting frame by a telescopic cylinder fixed to the frame.

[0033] A method for drying a phase change type insulating paper drying mechanism,

[0034] 1, the wood pulp is flattened to the water seepage plate, and scraped flat by the scraper, the base and the top cover are loaded back to the connection frame

[0035] 2, start the dehumidification piston mechanism, the majority of the water in the wood pulp through the cylinder of the dehumidification piston mechanism is sequentially drawn into the cylinder through the micropores of the water seepage plate, the check valve C, and then reverse drive a floating piston in the cylinder, the shut-off valve C is closed, and the water in the cylinder is discharged through the snoring drain valve;

[0036] 3. Injecting air into the drying box through the one-way valve A, and heating the injected air through the heat exchange air cylinder, the hot air sequentially passes through the wood pulp, the water seepage plate, the drainage hole, and simultaneously starts the exhaust. The mouth draws relatively low temperature air from the drying box until the temperature in the drying box reaches 50 ° C to 70 ° C;

[0037] 4, then close the air inlet nozzle, the heat pipe sleeve in the heat exchange air cylinder continues to heat, while the same drive continues to drive the vacuum on the exhaust nozzle, so that the pressure in the drying box is reduced, so that in the drying box The pressure is at least 10% below the standard atmospheric pressure until the temperature in the drying chamber reaches 70 ° C to 95 ° C. This is because the pressure is reduced and the moisture contained in the wood pulp evaporates rapidly from 70 ° C to 95 ° C. ;

[0038] 5, close the check valve B, start the vacuum pump connected to the cylinder, the piston moves along the cylinder, the remaining water vapor and air in the drying tank is discharged into the cylinder through the check valve C, Finally close the vacuum pump, check valve

[0039] The beneficial effects of the present invention are:

[0040] 1. The invention adopts a negative pressure cavity which can be vacuumed, and utilizes the principle that the boiling point (evaporation point) of water is relatively low under low pressure, and the water in the wood pulp is quickly obtained by vacuuming. A phase change occurs, which in turn evaporates. It has the advantages of short drying time, difficulty in occurrence of coke, and high uniformity of drying.

[0041] 2. The evaporation plate adopts a double-layer plate structure with a large hollowness. Compared with the single-layer plate structure, the heat transfer effect of the evaporation plate of the structure is poor, and the coke of the surface of the evaporation plate is not easy to occur. The structure of the 吋 is guaranteed The strength of the evaporation plate is the same, ensuring the degree of boring.

[0042] 3. The fixing method of brazing, the strength is good, and the welding process is relatively simple.

[0043] 4. The cooperation of the guiding surface and the positioning surface can ensure the parallelism of the bonding between the evaporation plate and the water-permeable plate, and prevent the thickness of the insulating paper produced from being uneven.

[0044] 5. The porous hard material of the clay sintered material has good surface finish and high temperature tolerance.

[0045] 6. The heat transfer fins effectively improve the heat conduction efficiency.

[0046] 7. The drying box is connected by a movable frame. After the drying is completed, the bottom plate can be conveniently removed from the connection frame of the drying box through the telescopic cylinder to take out the paper.

[0047] The above-described embodiments of the present invention are intended to be variously modified and modified without departing from the scope of the present invention. The technical scope of the present invention is not limited to the contents of the specification, and the technical scope thereof must be determined in accordance with the scope of the claims.

Claims

Claim

[Claim 1] A phase change type insulating paper drying mechanism, comprising: a drying box body, wherein the drying box body is a base located on a bottom wall surface of the drying box body, and a top cover located on a top wall surface of the drying box body, And a connecting frame constituting a side wall surface of the drying box; wherein a wood pulp drying platform is connected to the base through a plurality of connecting columns, the wood pulp drying platform comprises a flat plate for spreading the wood pulp layer, and the flat plate is a sizing protrusion is disposed around the slab, a drainage hole is disposed on the flat plate, and a water permeable plate made of a porous hard material is disposed on a bottom surface of the flat plate, and an edge of the water permeable plate is in close contact with an inner wall of the positioning protrusion, The drying platform is further connected with a dehumidifying piston mechanism through a hard drain pipe, and the dehumidifying piston mechanism is located on the outer side wall of the corresponding drying box body; the top cover is connected with an evaporation plate through an annular support frame The evaporation plate is made of a heat conductive metal plate, and a plurality of vent holes are arranged on the surface of the evaporation plate, and the contour of the evaporation plate and the contour of the water permeable plate A heating mechanism is further connected to the top cover, the heating mechanism includes a plurality of heat exchange air cylinders, and the heat exchange air cylinder is fixed on the top cover, one end of the heat exchange air cylinder extends into the support frame, and the other end Connected to an air inlet nozzle, a check valve A is connected to the air inlet nozzle, a heat generating sleeve is fixed on the inner wall of the heat exchange air cylinder; and a gas exhaust nozzle is connected to the side wall of the connecting frame a one-way valve _{B is} connected to the exhaust nozzle _; the dehumidifying piston mechanism includes a cylinder body, and a floating piston is disposed in the cylinder body, and one end of the cylinder body is connected to the hard drain pipe, A drain valve is further disposed on one end of the cylinder connected to the hard drain pipe, the drain valve is a one-way valve, and the other end of the cylinder is connected to a vacuum pump, and the hard drain pipe is connected There is a check valve 0>

[Claim 2] A phase change type insulating paper drying mechanism according to claim 1, wherein: said evaporation plate comprises a bottom plate and a top plate, wherein the top plate and the bottom plate are both plate-like structures, The bottom plate and the top plate are both arranged with an exhaust hole array, and the top plate and the bottom plate are fixedly connected by a plurality of connecting columns disposed between the exhaust holes.

[Claim 3] A phase change type insulating paper drying mechanism according to claim 2, wherein: the connecting post is fixedly connected to the bottom plate and the top plate by brazing.

[Claim 4] A phase change type insulating paper drying mechanism according to claim 1, wherein: The top of the raised edge is provided with a guiding surface of the inclined structure, and the evaporation plate is connected with the supporting frame by an annular fixing frame, the fixing frame is made of copper, and the outer edge of the fixing frame is provided with a positioning surface corresponding to the guiding surface.

[Claim 5] A phase change type insulating paper drying mechanism according to claim 1, wherein: said porous hard material is made of clay sintered.

[Claim 6] A phase change type insulating paper drying mechanism according to claim 1, wherein: the inner wall of the heat generating sleeve is provided with a spiral heat transfer fin, and a plurality of heat is embedded in the heat generating sleeve Resistance wire.

[Claim 7] A phase change type insulating paper drying mechanism according to claim 1, wherein: the heat generating sleeve extends into an end portion of the support frame to fix a dustproof net cover.

[Claim 8] A phase change type insulating paper drying mechanism according to claim 1, wherein: the drying box is connected to the work surface through a frame, and the connection frame is fixedly connected to the frame The base is pressed onto the connecting frame by a telescopic cylinder fixed to the frame.

[Claim 9] A method for drying a phase change type insulating paper drying mechanism according to claim 1, wherein: 1. flattening the wood pulp onto the water seepage plate, and scraping the flat plate by the scraper, the base is And the top cover is loaded back to the connecting frame, so that the evaporation plate is pressed against the wood pulp on the surface of the water seepage plate; 2. The dehumidifying piston mechanism is activated, and most of the water body in the wood pulp is sequentially passed through the cylinder of the dehumidifying piston mechanism. The micropores of the water permeable plate and the check valve C are drawn into the cylinder body, and then the floating piston in the cylinder body is reversely driven, and the 吋 check valve C is closed, and the water in the cylinder body is discharged through the snoring drain valve; Injecting air into the drying box through the check valve A, and heating the injected air through the heat exchange air cylinder, the hot air sequentially passes through the wood pulp, the water seepage plate, the drainage hole, and the same nozzle starts the exhaust nozzle to be the relative temperature. The lower air is drawn from the drying box until the temperature in the drying box reaches 50 ° C to 70 ° C. 4. Then close the air inlet, the heating sleeve in the heat transfer air tube continues to heat, and the drive continues. Vacuuming machine on the exhaust nozzle, making the drying box The pressure in the lowering is such that the pressure in the drying chamber is at least 10% below the standard atmospheric pressure until the temperature in the drying chamber reaches 70 ° C to 95 ° C. This is because the pressure is lowered, and the wood pulp contains Moisture evaporates rapidly from 70 ° C to 95 ° C; 5. Close the check valve B, start the vacuum pump connected to the cylinder, the piston moves along the cylinder, and the remaining water vapor and air in the drying tank The check valve c is discharged into the cylinder body, and finally the vacuum pump is closed, the check valve C is closed, and the humid air is discharged into the external environment through the drain valve.