CN110450424B - Tool for connecting and sealing plastic tube plates, tube plate connecting method and gas-gas heat exchanger - Google Patents
Tool for connecting and sealing plastic tube plates, tube plate connecting method and gas-gas heat exchanger Download PDFInfo
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- CN110450424B CN110450424B CN201910799341.2A CN201910799341A CN110450424B CN 110450424 B CN110450424 B CN 110450424B CN 201910799341 A CN201910799341 A CN 201910799341A CN 110450424 B CN110450424 B CN 110450424B
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- reaming
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000007789 sealing Methods 0.000 title claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000005553 drilling Methods 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 24
- 238000003825 pressing Methods 0.000 claims description 20
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 4
- 230000004323 axial length Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000008602 contraction Effects 0.000 description 17
- 230000006872 improvement Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/16—Perforating by tool or tools of the drill type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
- B29C66/0222—Mechanical pre-treatments, e.g. reshaping without removal of material, e.g. cleaning by air blowing or using brushes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
- B29C66/0224—Mechanical pre-treatments, e.g. reshaping with removal of material
- B29C66/02241—Cutting, e.g. by using waterjets, or sawing
- B29C66/02242—Perforating or boring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0011—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping plates or sheets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of plastic tube plate connecting tools and methods and gas-gas heat exchangers, and discloses a plastic tube plate connecting and sealing tool, a tube plate connecting method and a gas-gas heat exchanger. The main technical characteristics are as follows: through boring the aperture, then reheat the mode makes the panel that holds the hole periphery turn-ups outward, after the cooling, reamed and inserted the plastic tubing in holding the hole again, after cooling again, the plastic tubing just links together with plastic slab sealedly, can reduce because of the diameter of holding the hole in the expend with heat and contract with cold plastic slab at high temperature, because of the diameter grow of expend with heat and contract with cold plastic tubing, the leakproofness is better. The axial length of the plastic pipe can be prolonged at high temperature, the joint of the plastic plate and the plastic pipe is a round sliding surface due to the flanging at the periphery of the receiving hole, the plastic plate is not damaged due to the fact that the plastic pipe stretches along the axial direction, and the plastic pipe is not scratched when the plastic pipe moves in the plastic plate.
Description
Technical Field
The invention belongs to the technical field of plastic tube plate connection sealing methods and gas-gas heat exchangers, and particularly relates to a tool for plastic tube plate connection sealing and a tube plate connection method using the tool.
Background
Plastic materials are widely used in various fields due to the characteristics of strong corrosion resistance, acid and alkali resistance, aging resistance and the like. The connection and sealing between plastic pipe and plastic plate, the connection and sealing between plastic pipe and plastic pipe, etc. are important core processes for making various heat exchange equipment, liquid storage equipment, etc. The metal plate and the metal pipe are often in the forms of welding, riveting, expansion joint, bonding and the like, and the sufficient mechanical strength completely solves the thermal expansion coefficients of different materials. The plastic pipe and the metal pipe can be connected in a sealing way by riveting, expansion joint or bonding. Sufficient mechanical strength can overcome thermal expansion of the plastic tube or plate. When the plastic pipe is in sealing connection with the plastic plate, especially when the plastic pipe is applied to the condition of extremely large difference of environmental temperature, the thermal expansion coefficient of materials must be considered, and the traditional processes of welding, expansion joint, riveting and the like cannot meet the normal use of equipment, deformation and tearing occur, and various working media leak.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a tool for connecting and sealing the plastic tube plates, which has the advantages of simple structure, good sealing effect and no deformation and tearing.
In order to solve the problems, the plastic tube plate connecting and sealing tool adopts the following technical scheme: the plastic pipe reamer comprises a support frame with a through hole and a plurality of reaming cones, wherein the position of the through hole corresponds to the opening position on a plastic plate, the inner diameter of the through hole is slightly larger than the outer diameter of the plastic pipe, a fastening mechanism is arranged on the periphery of the support frame, each reaming cone comprises a cone head with a circular truncated cone shape, a cylindrical cone body with the outer diameter equal to the outer diameter of the plastic pipe and a cylindrical cone tail with the inner diameter equal to the inner diameter of the plastic pipe, and diameter scale marks are arranged on the outer side face of each cone head.
The additional technical characteristics are as follows:
the taper of the conical head is 1:3-1:1, a step of;
the ratio of the large head diameter to the small head diameter of the conical head is 1:5-1:4, a step of;
and marking the diameter numerical value of the corresponding position on the diameter scale line.
The second technical problem to be solved by the invention is to provide a method for sealing and connecting the tube plates by using the tool for sealing and connecting the plastic tube plates.
In order to solve the problems, the technical scheme adopted by the method for carrying out tube plate sealing connection by using the tool for plastic tube plate connection sealing is as follows:
first, fixing the plastic plate on the supporting frame
Fixing the plastic plate on the support frame through a fastening mechanism;
second step, drilling
Drilling a receiving hole in the plastic plate, wherein the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:2;
third step, reaming
Heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature;
fourth, the reaming is continued, and the plastic pipe is inserted into the hole on the plastic plate
And heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards to enable the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipe is completely expanded, and naturally cooling to normal temperature.
As a further improvement of the method: the method comprises the following steps:
first, searching the thermal expansion coefficient of the material
According to the material characteristic parameter table, searching and recording the thermal expansion coefficient reference value of the materials of the plastic pipe and the plastic plate;
secondly, fixing the plastic plate on the supporting frame
Fixing the plastic plate on the support frame through a fastening mechanism;
third step, drilling
According to the thermal expansion coefficient reference values of the plastic plate and the plastic pipe, calculating the thermal expansion coefficient reference values of the plastic plate and the plastic pipe, and drilling a receiving hole in the plastic plate, wherein when the thermal expansion coefficient reference values are less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient reference value is less than or equal to 9 and is less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient reference value is smaller than or equal to 11 and is smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2;
fourth step, reaming
Heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature;
fifth step, continuously reaming while inserting the plastic pipe into the hole in the plastic plate
Heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards, enabling the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipes are completely expanded, and naturally cooling to normal temperature;
as a further improvement of the method: the method comprises the following steps: first, searching the thermal expansion coefficient of the material
According to the material characteristic parameter table, searching and recording the thermal expansion coefficient reference value of the materials of the plastic pipe and the plastic plate;
secondly, performing experiments in a muffle furnace according to the environment temperature of equipment to measure the accurate value of the thermal expansion coefficient;
thirdly, fixing the plastic plate on the supporting frame
Fixing the plastic plate on the support frame through a fastening mechanism;
fourth step, drilling
Calculating the sum of the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe according to the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe, and drilling a receiving hole on the plastic plate, wherein when the sum of the thermal expansion coefficient accurate values is less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient precision value is less than or equal to 9 and less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient precision value is smaller than or equal to 11 and smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2;
fifth step, reaming
Heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature;
sixthly, continuously reaming and simultaneously inserting the plastic pipe into the hole on the plastic plate
And heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards to enable the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipe is completely expanded, and naturally cooling to normal temperature.
The third technical problem solved by the invention is to provide the gas-gas heat exchanger prepared by the plastic tube plate sealing connection method.
In order to solve the problems, the gas-gas heat exchanger adopts the following technical scheme: including casing, steam passageway and heat exchange channel, the steam passageway is including first end plate and the second end plate that is located both ends and connect the heat exchange tube between first end plate and the second end plate, first end plate with heat exchange tube tip fixed connection, its characterized in that: the second end plate is provided with a receiving hole with a flanging at the periphery, the heat exchange tube is inserted into the receiving hole, and the end part of the heat exchange tube extends out of the second end plate.
The additional technical characteristics are as follows: the end of the heat exchange tube extends out of the second end plate by 8-15 cm.
Compared with the prior art, the tool for connecting and sealing the plastic tube plates and the method for sealing and connecting the plastic tube plates by using the tool for connecting and sealing the plastic tube plates have the following advantages: firstly, because the plastic tube sealing device comprises a support frame with a through hole and a reaming cone, the position of the through hole corresponds to the opening position on a plastic plate, the inner diameter of the through hole is slightly larger than the outer diameter of the plastic tube, a fastening mechanism is arranged on the periphery of the support frame, the reaming cone comprises a cone head with a round table shape, a cylindrical cone body with the same outer diameter as the plastic tube and a cylindrical cone tail with the same inner diameter as the plastic tube, the outer side surface of the cone head is provided with diameter scale marks, and the plastic tube plate connecting and sealing tool is used for sealing the tube plate, and the method comprises the following steps: fixing the plastic plate on the support frame through a fastening mechanism; drilling a receiving hole in the plastic plate, wherein the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:2; heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature; heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate the plastic plate by the plastic pipe, enabling the reaming cone to separate from the plastic pipe, enabling the end of the plastic pipe to penetrate the plastic plate to continuously push down the plastic pipe, enabling the end of the plastic pipe to extend out of the plastic plate for a certain distance, continuously penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by the same method until all the plastic pipe is expanded, naturally cooling to normal temperature, firstly drilling small holes, then enabling plates around the receiving holes to be turned outwards in a reheating mode, reaming again after cooling, inserting the plastic pipe into the receiving holes again, and after cooling again, enabling the plastic pipe to be connected with the plastic plate in a sealing mode, in a high-temperature working environment, enabling the diameter of the receiving holes in the plastic plate to be reduced due to thermal expansion and contraction of the plastic pipe to the thermal expansion and contraction of the plastic plate to the fact that the diameter of the plastic plate is enlarged due to the thermal expansion and contraction of the plastic pipe is larger, enabling the axial length of the plastic pipe to be longer due to the fact that the receiving holes are turned-over and the side edges are arranged around the receiving holes are turned-over, enabling the plastic plate and the plastic pipe to be connected with the plastic pipe to be large in the temperature change, and the plastic pipe to be not damaged in the axial direction when the plastic plate is not axially moving in the plastic plate is not damaged in the axial direction when the plastic plate is in the plastic direction when the plastic plate is in the high temperature changing temperature;
secondly, as the taper of the conical head is 1:3-1:1, a step of; the ratio of the large head diameter to the small head diameter of the conical head is 1:5-1:4, a step of; the reaming cones with different conicity can be adopted for reaming according to the difference of the thermal expansion coefficients of the materials, so that the application range is wider;
thirdly, because the diameter numerical value of the corresponding position is marked on the diameter scale mark, when the reaming cone is pressed down, the pressing down depth of the reaming cone for the first time can be determined according to the standard diameter numerical value on the diameter scale mark;
fourthly, before drilling, searching and recording the thermal expansion coefficient reference values of the materials of the plastic pipe and the plastic plate according to the material characteristic parameter table; fixing the plastic plate on the support frame through a fastening mechanism; then calculating the sum of the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe according to the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe, and drilling a receiving hole on the plastic plate, wherein when the sum of the thermal expansion coefficient accurate values is less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient precision value is less than or equal to 9 and less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient precision value is smaller than or equal to 11 and smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2; therefore, the diameter of the receiving hole during the first drilling can be determined according to the thermal expansion coefficient of the material, and the edge tearing of the plastic plate at the receiving hole due to thermal expansion and contraction during reaming can be effectively avoided;
fifthly, before drilling, performing experiments in a muffle furnace according to the environment temperature used by equipment, and measuring the accurate value of the thermal expansion coefficient; fixing the plastic plate on the support frame through a fastening mechanism; calculating the sum of the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe according to the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe, and drilling a receiving hole on the plastic plate, wherein when the sum of the thermal expansion coefficient accurate values is less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient precision value is less than or equal to 9 and less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient precision value is smaller than or equal to 11 and smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2; therefore, the diameter of the receiving hole is determined more accurately according to the thermal expansion coefficient of the material, and edge tearing of the plastic plate at the receiving hole due to thermal expansion and contraction during reaming can be effectively avoided.
Compared with the prior art, the gas-gas heat exchanger provided by the invention has the following advantages: the heat exchange tube comprises a shell, a hot gas channel and a heat exchange channel, wherein the hot gas channel comprises a first end plate, a second end plate and a heat exchange tube, the first end plate and the second end plate are positioned at two ends, the heat exchange tube is connected between the first end plate and the second end plate, the first end plate is fixedly connected with the end part of the heat exchange tube, a receiving hole with a flanging is arranged on the periphery of the second end plate, the heat exchange tube is inserted into the receiving hole, the end part of the heat exchange tube extends out of the second end plate, when the temperature of the gas exchange tube is high, the second end plate is increased, the diameter of the receiving hole is reduced due to expansion and contraction of the second end plate, the outer diameter of the heat exchange tube is increased due to expansion and contraction of the heat exchange tube, the sealing effect is better, and when the heat exchange tube is axially elongated due to expansion and contraction of the heat exchange tube, the heat exchange tube fixed at two ends is prevented from being broken or thinned due to expansion and contraction of the heat exchange tube, and leakage or resistance of the heat is increased; and secondly, as the end part of the heat exchange tube extends out of the second end plate by 8-15 cm, the heat exchange tube is prevented from being separated from the bearing tube on the second end plate due to expansion caused by heat and contraction caused by cold of the heat exchange tube.
Drawings
FIG. 1 is a schematic view of a tool for sealing a plastic tube sheet connection;
FIG. 2 is a schematic view of the structure of a reamer;
FIG. 3 is a schematic view of the structure of the plastic tube sheet connection;
FIG. 4 is a schematic diagram of a gas-to-gas heat exchanger;
fig. 5 is a section A-A of fig. 4.
Detailed Description
The structure and the use principle of the tool for connecting and sealing the plastic tube plates, the method for connecting the tube plates by using the tool for connecting and sealing the plastic tube plates, and the structure and the use principle of the gas-gas heat exchanger manufactured by using the tube plate connecting plate are further described in detail below with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1 and 2, the plastic tube plate connecting and sealing tool is schematically structured. FIG. 3 is a schematic view of the structure of the joint of the plastic tube plates; the plastic tube plate connecting and sealing tool comprises a support frame 2 with a through hole 1 and a plurality of reaming cones 3, wherein the position of the through hole 1 corresponds to the opening position on a plastic plate 5, the inner diameter of the through hole 1 is slightly larger than the outer diameter of a plastic tube 6, a fastening mechanism 4 is arranged on the periphery of the support frame 2, the reaming cones 3 comprise a cone head 31 with a circular truncated cone shape, a cone body 32 with the same outer diameter and diameter as the plastic tube 6, and a cylindrical cone tail 33 with the same inner diameter as the plastic tube 6, and diameter scale marks 34 are arranged on the outer side surface of the cone head 31. Firstly, through boring the aperture, then reheat mode makes the panel that holds the hole periphery turn-ups outward, after cooling, reamed and insert the plastic tubing in the hole of holding again, after cooling again, plastic tubing 6 just is in the same place with plastic board 5 sealedly, in high temperature operational environment, because plastic board 5 and plastic tubing 6 all have the thermal expansion shrinkage characteristic, because the diameter of holding the hole in the thermal expansion shrinkage plastic board can reduce under the high temperature, because the diameter grow of thermal expansion shrinkage plastic tubing, the leakproofness is better, and plastic tubing axial length can also lengthen under the high temperature, because the hole week of holding has the turn-ups, plastic board and plastic tubing junction are the slick and sly face, when the temperature variation is great, the plastic tubing can be along plastic tubing axial direction removal in the plastic board, can not be because of the plastic tubing stretches out and draws back along axial direction and cause the plastic board damage, moreover can not scratch to the plastic tubing when the plastic tubing removes in the plastic board.
The taper of the bit 31 is 1:3-1:1, a step of; the ratio of the major diameter to the minor diameter of the cone head 31 is 1:5-1:4, a step of; the reaming cones with different conicity can be adopted for reaming according to the difference of the thermal expansion coefficients of the materials, so that the application range is wider;
and marking the diameter numerical value at the corresponding position on the diameter scale mark, and determining the pressing depth of the reaming cone for the first time according to the standard diameter numerical value on the diameter scale mark when the reaming cone is pressed.
The method for performing tube plate sealing connection by using the plastic tube plate connection sealing tool comprises the following steps:
first, fixing the plastic plate on the supporting frame
The plastic plate 5 is fixed on the support frame 2 through the fastening mechanism 4;
second step, drilling
A receiving hole is drilled on the plastic plate 5, and the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:2;
third step, reaming
Heating the receiving holes on the plastic plate 5 by using a heating mechanism, enabling the temperature to be close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones 3 until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones 3, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the reaming holes are completely expanded, and naturally cooling to normal temperature;
fourth, the reaming is continued, and the plastic pipe is inserted into the hole on the plastic plate
And heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe 6 on the cone tail 33, enabling the front end of the plastic pipe 6 to be propped against the rear of the cone body 32, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards to enable the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipes are completely expanded, and naturally cooling to the normal temperature.
As a further improvement of the method: the method comprises the following steps:
first, searching the thermal expansion coefficient of the material
According to the material characteristic parameter table, searching and recording the thermal expansion coefficient reference value of the materials of the plastic pipe and the plastic plate;
secondly, fixing the plastic plate on the supporting frame
Fixing the plastic plate on the support frame through a fastening mechanism;
third step, drilling
According to the thermal expansion coefficient reference values of the plastic plate and the plastic pipe, calculating the thermal expansion coefficient reference values of the plastic plate and the plastic pipe, and drilling a receiving hole in the plastic plate, wherein when the thermal expansion coefficient reference values are less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient reference value is less than or equal to 9 and is less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient reference value is smaller than or equal to 11 and is smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2;
fourth step, reaming
Heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature;
fifth step, continuously reaming while inserting the plastic pipe into the hole in the plastic plate
And heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards to enable the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipe is completely expanded, and naturally cooling to normal temperature.
If the thermal expansion coefficient of the material is large, the diameter of the drilled hole is larger, and if the thermal expansion coefficient of the material is small, the diameter of the drilled hole is smaller, and the flanging can not be torn during reaming. Therefore, the diameter of the receiving hole during the first drilling can be determined according to the thermal expansion coefficient of the material, and the edge tearing of the plastic plate at the receiving hole due to thermal expansion and contraction during reaming can be effectively avoided.
As a further improvement of the method: the method comprises the following steps:
first, searching the thermal expansion coefficient of the material
According to the material characteristic parameter table, searching and recording the thermal expansion coefficient reference value of the materials of the plastic pipe and the plastic plate;
secondly, performing experiments in a muffle furnace according to the environment temperature of equipment to measure the accurate value of the thermal expansion coefficient;
thirdly, fixing the plastic plate on the supporting frame
Fixing the plastic plate on the support frame through a fastening mechanism;
fourth step, drilling
Calculating the sum of the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe according to the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe, and drilling a receiving hole on the plastic plate, wherein when the sum of the thermal expansion coefficient accurate values is less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient precision value is less than or equal to 9 and less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient precision value is smaller than or equal to 11 and smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2;
fifth step, reaming
Heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature;
sixthly, continuously reaming and simultaneously inserting the plastic pipe into the hole on the plastic plate
And heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards to enable the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipe is completely expanded, and naturally cooling to normal temperature.
If the thermal expansion coefficient of the material is large, the diameter of the drilled hole is larger, if the thermal expansion coefficient of the material is small, the diameter of the drilled hole is smaller, and the flanging is not torn during reaming, so that the diameter of the receiving hole during the first drilling is more accurately determined according to the thermal expansion coefficient of the material, and the edge tearing of the plastic plate at the receiving hole during reaming due to thermal expansion and cold contraction can be effectively avoided.
As shown in fig. 4 and 5, the structure of the gas-gas heat exchanger is schematically shown; the gas-gas heat exchanger comprises a shell 11, a hot gas channel 12 and a heat exchange channel 13, wherein the hot gas channel 12 comprises a first end plate 14, a second end plate 15 and a heat exchange tube 16 connected between the first end plate 14 and the second end plate 15, the first end plate 14 and the heat exchange tube 16 are fixedly connected through a fastening ring 17, a receiving hole 18 with an outward flange 19 is arranged on the second end plate 15, the heat exchange tube 16 is inserted into the receiving hole 18, the end part of the heat exchange tube 16 extends out of the second end plate 15, when the temperature of the working environment is high, the diameter of the receiving hole 18 is reduced due to expansion and contraction of the second end plate 15 when the temperature rises, the heat exchange tube 16 is increased in outer diameter due to expansion and contraction of the heat exchange tube, the sealing effect is better, and when the heat exchange tube 16 is axially stretched due to expansion and contraction of the heat exchange tube, the heat exchange tube can move in the receiving hole on the second end plate, so that the hot gas leakage or the increase of the hot gas resistance caused by expansion and contraction of the heat exchange tube fixed at the two ends is avoided.
The end of the heat exchange tube 16 extends out of the second end plate by 8-15 cm, so that the heat exchange tube is prevented from being separated from the bearing tube on the second end plate due to expansion caused by heat and contraction caused by cold.
The scope of the present invention is not limited to the above embodiments, and it is within the scope of the present invention as long as the structure is the same as or similar to the structure of the tool for connecting and sealing a plastic tube plate of the present invention, or the method of connecting a tube plate is the same as or similar to the method of connecting a tube plate, or the structure is the same as or similar to the structure of the gas-gas heat exchanger of the present invention.
Claims (7)
1. The method for performing tube plate connection sealing by using the tool for plastic tube plate connection sealing is characterized in that: the tool for connecting and sealing the plastic tube plate comprises a support frame with a through hole and a plurality of reaming cones, wherein the position of the through hole corresponds to the opening position on the plastic plate, the inner diameter of the through hole is slightly larger than the outer diameter of the plastic tube, a fastening mechanism is arranged on the periphery of the support frame, each reaming cone comprises a cone head with a circular truncated cone shape, a cylindrical cone body with the same diameter as the outer diameter of the plastic tube and a cylindrical cone tail with the same diameter as the inner diameter of the plastic tube, diameter scale marks are arranged on the outer side surface of each cone head,
the method comprises the following steps:
first, searching the thermal expansion coefficient of the material
According to the material characteristic parameter table, searching and recording the thermal expansion coefficient reference value of the materials of the plastic pipe and the plastic plate;
secondly, fixing the plastic plate on the supporting frame
Fixing the plastic plate on the support frame through a fastening mechanism;
third step, drilling
According to the thermal expansion coefficient reference values of the plastic plate and the plastic pipe, calculating the thermal expansion coefficient reference values of the plastic plate and the plastic pipe, and drilling a receiving hole in the plastic plate, wherein when the thermal expansion coefficient reference values are less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient reference value is less than or equal to 9 and is less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient reference value is smaller than or equal to 11 and is smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2;
fourth step, reaming
Heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature;
fifth step, continuously reaming while inserting the plastic pipe into the hole in the plastic plate
And heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards to enable the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipe is completely expanded, and naturally cooling to normal temperature.
2. The method of tube sheet connection sealing of claim 1, wherein:
the method comprises the following steps:
first, searching the thermal expansion coefficient of the material
According to the material characteristic parameter table, searching and recording the thermal expansion coefficient reference value of the materials of the plastic pipe and the plastic plate;
secondly, performing experiments in a muffle furnace according to the environment temperature of equipment to measure the accurate value of the thermal expansion coefficient;
thirdly, fixing the plastic plate on the supporting frame
Fixing the plastic plate on the support frame through a fastening mechanism;
fourth step, drilling
Calculating the sum of the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe according to the thermal expansion coefficient accurate values of the plastic plate and the plastic pipe, and drilling a receiving hole on the plastic plate, wherein when the sum of the thermal expansion coefficient accurate values is less than or equal to 7 and less than 9, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:5-1:4, a step of; when the thermal expansion coefficient precision value is less than or equal to 9 and less than 11, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:4-1:3, a step of; when the thermal expansion coefficient precision value is smaller than or equal to 11 and smaller than 14, the ratio of the diameter of the receiving hole to the outer diameter of the plastic pipe is 1:3-1:2;
fifth step, reaming
Heating the receiving holes on the plastic plate by using a heating mechanism, wherein the temperature is close to the softening point, slowly and vertically inserting the reaming cones into the receiving holes, slowly pressing down the reaming cones until the diameter of the reamed receiving holes reaches 1/9-1/8 of the outer diameter of the plastic pipe, stopping pressing down the reaming cones, forming flanging at the periphery of the receiving holes, continuously expanding other receiving holes on the plastic plate by adopting the same method until all the receiving holes are expanded, and naturally cooling to normal temperature;
sixthly, continuously reaming and simultaneously inserting the plastic pipe into the hole on the plastic plate
And heating the receiving holes on the plastic plate to a softening point again, sleeving the plastic pipe on the cone tail, enabling the front end of the plastic pipe to prop against the rear of the cone body, pushing the reaming cone to penetrate through the plastic plate by using the plastic pipe, separating the reaming cone from the plastic pipe, enabling the end part of the plastic pipe to penetrate through the plastic plate, continuing pushing the plastic pipe downwards to enable the end part of the plastic pipe to extend out of the plastic plate for a certain distance, continuing penetrating the plastic pipe into the corresponding receiving holes on the plastic plate by adopting the same method until all the plastic pipe is completely expanded, and naturally cooling to normal temperature.
3. The method of tube sheet connection sealing of claim 1, wherein: the taper of the conical head is 1:3-1:1.
4. the method of tube sheet connection sealing of claim 1, wherein: the ratio of the large head diameter to the small head diameter of the conical head is 1:5-1:4.
5. the method of tube sheet connection sealing of claim 1, wherein: and marking the diameter numerical value of the corresponding position on the diameter scale line.
6. A gas-to-gas heat exchanger prepared using the tube sheet connection sealing method of claim 1 or 2, comprising a housing, a hot gas channel and a heat exchange channel, the hot gas channel comprising a first end plate and a second end plate at both ends and a heat exchange tube connected between the first end plate and the second end plate, the first end plate being fixedly connected to the heat exchange tube end, characterized in that: the second end plate is provided with a receiving hole with a flanging at the periphery, the heat exchange tube is inserted into the receiving hole, and the end part of the heat exchange tube extends out of the second end plate.
7. A gas-to-gas heat exchanger according to claim 6, wherein: the end of the heat exchange tube extends out of the second end plate by 8-15 cm.
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| CN201910799341.2A CN110450424B (en) | 2019-08-28 | 2019-08-28 | Tool for connecting and sealing plastic tube plates, tube plate connecting method and gas-gas heat exchanger |
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| CN201910799341.2A CN110450424B (en) | 2019-08-28 | 2019-08-28 | Tool for connecting and sealing plastic tube plates, tube plate connecting method and gas-gas heat exchanger |
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| CN114523698A (en) * | 2022-01-17 | 2022-05-24 | 酷黑科技（北京）有限公司 | Sealing connection method and sealing connection device |
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