CN110314973A - It is used to prepare the mold of heat exchanger pipe fitting - Google Patents
It is used to prepare the mold of heat exchanger pipe fitting Download PDFInfo
- Publication number
- CN110314973A CN110314973A CN201910549218.5A CN201910549218A CN110314973A CN 110314973 A CN110314973 A CN 110314973A CN 201910549218 A CN201910549218 A CN 201910549218A CN 110314973 A CN110314973 A CN 110314973A
- Authority
- CN
- China
- Prior art keywords
- wall
- module
- pipe fitting
- external mold
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention relates to a kind of molds for preparing heat exchanger pipe fitting, belong to heat exchanger pipe fitting manufacturing technology field.It includes the branch hold mode of internal model, external mold and external mold；Forming tank corresponding with the fixed structure on heat exchanger pipe fitting is provided on the inner wall of the external mold；The internal model includes core module, closing module and seal module；Closing module constitutes the main part of the internal model and for installing and fixing the core module；The core module, closing module and seal module form a swelling pressure space, and the seal module liner is in workpiece inner wall；The core mold has a runner communicated with the swelling pressure space；The swelling pressure space is corresponding with the forming tank of the external mold.The present invention dexterously on the side wall of pipe fitting, produces the fixed structure of protrusion, so that pipe fitting is capable of forming stable combination during installation, i.e., certain gap is remained between pipe fitting, and not vibrated impact；To improve the stability and using effect of product.
Description
Technical field
The present invention relates to a kind of molds for preparing heat exchanger pipe fitting, belong to heat exchanger pipe fitting manufacturing technology field.
Background technique
Heat exchanger is also known as heat exchanger, is a kind of special equipment that two kinds of fluids are carried out with heat exchange.In petroleum, change
There is important application in the industrial productions such as work, light industry, pharmacy, the energy.As heat exchanger can be used as heater, cooling in Chemical Manufacture
Device, condenser, evaporator and reboiler etc.；Coal-burning power plant is to reduce exhaust gas temperature progress waste heat recycling to change using polytetrafluoroethylene (PTFE)
Hot device.Using teflon heat exchanger, the sour corrosion of flue gas can be prevented.Tube sheet in teflon heat exchanger limits swollen pressure heating
Welding procedure is the key technology that pipe fitting is connect with tube sheet.
In the prior art, common heat exchanger is divided into board-like, shell-and-tube and coaxial.Above-mentioned heat exchanger respectively has advantage and disadvantage.
Plate heat exchanger is to be pressed into the heat exchange plate with corrugated shape with metal sheet, then closed assembly, with clamping plate, spiral shell
Bolt fastens, and is claimed with heat exchange efficiency brilliant idea, makes also relatively easy.But the separation of its two kinds of fluids relies primarily on sealing strip
And fastening force, therefore and operating pressure no more than 2.5MPa；The ability of renitency vibration and compression shock is poor；Pass through
The fluid of plate heat exchanger, pressure drop is larger, when pressure is run it is high when there is also the hidden danger of leakage.
Coaxial heat exchanger is made of concentric inner tube and outer tube, and cold fluid and hot fluid is respectively in inner tube and outer tube annular space
Flowing, and conduct heat simultaneously.Therefore shell is not needed, it is only necessary to heat preservation be carried out to outer tube and mechanicalness is protected.Usually
Form is that one layer of heat preservation material is wrapped up outside outer tube, further around packet one layer of polymeric material.Since it does not have shell, pipe fitting can be curved
Song distorts, is wound into various shape, is adapted to the needs in different places, is seated in various strange spaces.It is logical
Often it is made into helical form.Coaxial heat exchanger can also be actually considered as to the specific type of shell-and-tube heat exchanger, be considered as shell
Alienation at the shell-and-tube heat exchanger of outer tube special shape.It is much better on heat exchange efficiency, but it is opposite in production
Shell-and-tube is more complicated, and the heat exchange area under unit mass is also smaller, and the ability of compressive resistance vibration and compression shock is also worse
It is some.
Shell-and-tube heat exchanger is a kind of heat exchanger with tube side and shell side；A kind of fluid is in tube side, one other fluid
In shell side.Heat exchanger tube can be fabricated to various structures, such as in-line, U-shaped, S type, M type, pipe dish type, spiral shape.It can also make
At forms such as such as cyclone pipes.The heat exchange efficiency of shell-and-tube heat exchanger is low compared with plate heat exchanger, but runs safer, more stable, fortune
Row pressure can also be bigger.But it usually requires to fix heat exchange pipe fitting by tube sheet.In-line arrangement heat exchanger tube installs tube sheet side
Just, other structures installation tube sheet is extremely difficult, it usually needs special fixed structure, and fixed effect is general, and this is allowed for
The ability of renitency vibration and compression shock is poor.Although in-line arrangement has good renitency after fixed by tube sheet
The ability of vibration and compression shock, but tube sheet plays choked flow to liquid in shell side to a certain extent, so that inside and outside two kinds of fluids
Flow velocity occur compared with high speed difference, significantly impact heat exchange efficiency.
Summary of the invention
The invention solves the above problems, so that offer prepares the mold of heat exchanger pipe fitting.It is manufactured with the mold
Pipe fitting is suitable for shell-and-tube heat exchanger or coaxial-type heat exchanger.The pipe fitting is used for shell-and-tube heat exchanger, so that shell-and-tube heat exchanger
The ability for no longer needing tube sheet that can play good renitency vibration and compression shock；The pipe fitting exchanges heat for coaxial-type
Device changes antidetonation between coaxitron in the prior art so that generating good stability between the coaxitron of coaxial-type heat exchanger
The defect of kinetic force difference.
Technical proposal that the invention solves the above-mentioned problems is as follows:
It is used to prepare the mold of heat exchanger pipe fitting, the branch hold mode including internal model, external mold and external mold；It is set on the inner wall of the external mold
It is equipped with forming tank corresponding with the fixed structure on heat exchanger pipe fitting；The internal model includes core module, closing module and close
Seal module；Closing module constitutes the main part of the internal model and for installing and fixing the core module；The core
Module, closing module and seal module form a swelling pressure space, and the seal module liner is in workpiece inner wall；The core mould
Tool has a runner communicated with the swelling pressure space；The swelling pressure space is corresponding with the forming tank of the external mold.
In above-mentioned technical proposal of the present invention, closing module is the component part of internal model, is risen to core module fixed, protection
Effect, and a swelling pressure space is collectively formed with core module and seal module.And seal module, then it is one kind by flexible material
Manufactured tympan mainly plays sealing, and when use needs object and pads in other words to its carrying.In the present invention,
Play liner is the inner wall of workpiece.
As a preferred embodiment of the above technical solution, the core module includes that core ontology and inside have the defeated of the runner
Pipe is sent, core ontology has a radially connected road, by the radially connected road runner and the swelling pressure space is connected
It is logical.
As a preferred embodiment of the above technical solution, the outer wall of the core ontology is cylindrical wall.
As a preferred embodiment of the above technical solution, the external mold includes external mold inner wall and external mold outer wall；It is arranged on external mold inner wall
There is the forming tank；The external mold outer wall includes the first, second slope surface wall and top wall of two radial symmetric settings；It is described
Branch hold mode is one group, and every group two, two branch hold modes with group are symmetrical arranged；The inner wall of each hold mode has and the broken face
The shape that wall matches so that by two branch hold modes to same group apply it is close to each other come power consolidate the external mold.
In above-mentioned technical proposal of the present invention, pipe fitting is the pipe fitting with fixed structure.
The pipe fitting specific structure is as follows:
The section of pipe fitting is positive the side X shape structure, and the pipe fitting is made to have X side wall；The side wall is all positive side wall, or including sun
Side wall and negative side wall；X is positive integer, and X >=4；
When including positive side wall and negative side wall, positive side wall is evenly arranged throughout the circumferential；
The yin side wall is made of side wall ontology；
The sun side wall is made of side wall ontology and fixed structure；
The fixed structure is the structure that side wall ontology evagination is formed, with the side wall ontology integrally connected.
Fixed structure includes the fixation wall that the supporting walls being connected with side wall ontology and side wall ontology are not directly contacted with；It is described
Supporting walls are connected directly with fixation wall or are connected by transition wall.
The supporting walls are slope planar structure, and the fixation wall is flat-top shape structure.
The gradient of the supporting walls is 15 ~ 60 °.
Due to having the fixed structure of evagination on the side wall of pipe fitting.Therefore, when two identical pipe fitting assemblings snugly into each other
When, gap can be generated because of the steric hindrance of fixed structure between pipe fitting.Just it is arranged one group on the pipe fitting of per unit length to consolidate
Structure is determined, to guarantee that the gap between long pipe fitting is firm.Due to the presence of fixed structure, there is no need to tube sheets to come
Make to keep suitable spacing between pipe fitting, can also guarantee the capacity of shell side.And the installation for pipe fitting, it is only necessary to multiple pipes
As soon as group structure banding of part, this group of structure can form stable structure, then be installed in shell, can be formed scientific and reasonable
Shell-and-tube heat exchanger heat exchange foundation structure.
When pipe fitting applies to coaxitron, inner and outer pipes need to set a reasonable cooperation bore.The internal diameter of usual outer tube
It is more bigger than the outer diameter of inner tube, it is easily installed in this way.After installation is complete, can directly carry out using.The internal diameter ratio of this outer tube
The bigger configuration of the outer diameter of inner tube is needed not worry about and can be shaken, because this kind of product is commonly available to hot environment, and
Inner tube leads to heating agent, and outer tube leads to refrigerant；Therefore inner tube will form certain expansion, and bigger size is filled up, to form stable structure.
In conclusion the invention has the following advantages:
The present invention dexterously on the side wall of pipe fitting, produces the fixed structure of protrusion, so that pipe fitting is capable of forming surely during installation
Fixed combination remains certain gap between pipe fitting, and not vibrated impact；To improve the stability of product
And using effect.
Detailed description of the invention
Fig. 1 is the side view of the embodiment of the present invention one；
Fig. 2 is the AA of Fig. 1 to cross-sectional view；
Fig. 3 is the area the A partial enlarged view of Fig. 2；
Fig. 4 is sectional arrangement drawing of the pipe fitting with external mold；
Fig. 5 is the main view of internal model；
Fig. 6 is the side view half sectional view of internal model；
Fig. 7 is the side view cutaway drawing of external mold；
Fig. 8 is the structural schematic diagram of the embodiment of the present invention two；
Fig. 9 is the assembling schematic diagram of the embodiment of the present invention one.
In figure, W- side wall, Wx- sun side wall, Wy- yin side wall, 10- side wall ontology, 20- fixed structure, 20a- fixation wall,
20b- transition wall, 20c- supporting walls, the α-gradient；
The gap 100-；200- inner tube；
310- internal model, 311- core module, 311-1- core ontology, 311-2- runner, 312- close module, 313- sealed mould
Part, 314- swelling pressure space；
320- external mold, 320-1- forming tank, 321- external mold inner wall, 322- external mold outer wall, 323-1 the first slope surface wall, the top 323-2-
It faces the wall and meditates, 323-3- the second slope surface wall；
330- branch hold mode.
Specific embodiment
Explanation is further explained to the present invention below in conjunction with attached drawing.
Present embodiment is only explanation of the invention, is not limitation of the present invention.Those skilled in the art
Any change for being made after having read specification of the invention of member, as long as within the scope of the claims, it all will be by
The protection of Patent Law.
Embodiment one
The pipe fitting of heat exchanger is suitable for coaxial heat exchanger and shell-and-tube heat exchanger.As shown in Figs. 1-2, the section of pipe fitting is positive eight
Side shape structure, therefore the pipe fitting has 8 side wall W.These side walls W is all positive side wall Wx.Positive side wall Wx is by 10 He of side wall ontology
Fixed structure 20 is constituted.The fixed structure 20 is the structure that 10 evagination of side wall ontology is formed, with 10 one of side wall ontology
Connection.
Fig. 3 is the partial enlarged view of Fig. 2, which clearly illustrates the concrete shape of fixed structure 20.It includes and side
The fixation wall 20a that the connected supporting walls 20c of wall ontology 10 and side wall ontology 10 are not directly contacted with；The supporting walls 20c and fixation
Wall 20a is connected by transition wall 20b.The supporting walls 20c is slope planar structure, and the fixation wall 20a is flat-top shape structure.Institute
The gradient α for stating supporting walls 20c can be 15 ~ 60 °, and in the present embodiment, α is 23.6 °.Why it is referred to as supporting walls, be because
For after it is installed to heat exchanger, two pipes adjacent to each other can supported whereby between each other, and make to keep one between pipe
A stable gap 100, as shown in Figure 9.
The preparation method of pipe fitting in the present embodiment described below.
Preparation method is swelling pressure molding, and it is hydraulic press that swelling pressure molding, which needs the equipment used, it is also necessary to be matched with the hydraulic press
Mold.Mold includes internal model, external mold and branch hold mode.
Specifically, as shown in figure 4, this figure shows the installation relations of pipe fitting and external mold 320 and branch hold mode 330.And it is interior
Mould is sleeved on inside pipe fitting, and since pipe fitting is not broken away, therefore this figure cannot show internal model.
As shown in figure 5, this figure shows the installation relations of pipe fitting and internal model 310.
In this way, the installation relation of pipe fitting and mold can be well understood in we in conjunction with Fig. 4 and Fig. 5.
Fig. 6 is the side view half sectional view of internal model 310.In figure, 311- core module, 311-1- core ontology, 311-2- stream
Road, 312- close module, 313- seal module, 314- swelling pressure space.In the assembly relation and internal model 310 for understanding pipe fitting and mold
Composition after, then to analyze the forming principle of fixed structure 20.Firstly, high voltage state hydraulic oil is provided by hydraulic press, pass through runner
311-2 is flowed into the swelling pressure space 314 formed by core module 311, closing module 312 and seal module 313.Core module
311 and closing module 312 be all that rigid material is constituted, pressure maintaining can be played the role of, will not because of oil pressure increase and rise
It opens.And seal module 313 is the thin polymer film to seal being made of flexible material, and has good elasticity；?
That is can be to extending out at seal module 313；Being apparent from swelling pressure space 314 is an annular space, therefore the direction extended out is circumferential
And not be to a direction.In conjunction with Fig. 4 and Fig. 5, it will be seen that 314 periphery of swelling pressure space is pipe fitting, outside pipe fitting
Enclosing is external mold 320, and three is tightly by patch.From the point of view of Fig. 7, if 320 inner wall of external mold does not have forming tank 320-1, then this
A fixed structure 20 obviously can not be formed by swelling pressure.Fortunately, forming tank 320-1 is existing, that is to say, that fixed structure
20 be molding because of forming tank 320-1.And it is recognised that the distribution of the fixed structure 20 on pipe fitting side wall, with forming tank
320-1 is synchronous in the distribution of 320 inner wall of external mold.Since Fig. 2 has been disclosed the distribution of fixed structure 20, therefore forming tank
320-1 no longer needs to explain separately in the distribution of 320 inner wall of external mold.
After having understood forming principle, then goes to be operated just and become very simple.Pipe fitting and mold are assembled first；
Then hydraulic press is connected to the runner of internal model.Open hydraulic press arrive preset pressure value, opening fuel path switch, pressure maintaining 30S, so
Molding pipe fitting is finally taken out in pressure release afterwards.
Embodiment two
The pipe fitting of heat exchanger is suitable for coaxial heat exchanger and shell-and-tube heat exchanger.As shown in Figs. 1-2, the section of pipe fitting is positive eight
Side shape structure, therefore the pipe fitting has 8 side wall W.These side walls W includes sun side wall Wx and negative side wall Wy, and positive side wall Wx is whole
It is evenly arranged in a circumferential direction；In the present embodiment, positive side wall Wx and yin side wall Wy are spaced apart.The yin side wall Wy is by side wall ontology
10 are constituted；The sun side wall Wx is made of side wall ontology 10 and fixed structure 20；The fixed structure 20 is outside side wall ontology 10
The structure convexed into, with 10 integrally connected of side wall ontology.
In addition to above-mentioned difference, the present embodiment and remaining structure of embodiment two are all identical.And mold and preparation method are also all several
It is identical.Mold is slightly different, but the distribution of the forming tank of namely outer mold, this is the fixed structure with required pipe fitting
Distribution be synchronous.
Claims (4)
1. preparing the mold of heat exchanger pipe fitting, the branch hold mode (330) including internal model (310), external mold (320) and external mold；It is special
Sign is: being provided with forming tank (320-1) on the inner wall of the external mold (320)；The internal model (310) includes core module
(311), module (312) and seal module (313) are closed；Close the main part that module (312) constitute the internal model (310)
And for installing and fixing the core module (311)；The core module (311), closing module (312) and seal module
(313) a swelling pressure space (314) is formed, seal module (313) liner is in workpiece inner wall；The core mold (311)
The runner (311-2) communicated with one with the swelling pressure space (314)；The swelling pressure space (314) and the external mold (320)
Forming tank (320-1) is corresponding.
2. mold according to claim 1, it is characterised in that: the core module (311) includes core ontology (311-1)
With the internal delivery pipe (311-2) with the runner, core ontology (311-1) has a radially connected road, passes through the diameter
To connection road the runner is connected to the swelling pressure space (314).
3. mold according to claim 1, it is characterised in that: the outer wall of the core ontology (311-1) is cylindrical wall.
4. mold according to claim 1, it is characterised in that: the external mold (320) includes external mold inner wall (321) and external mold
Outer wall (322)；The forming tank (320-1) is provided on external mold inner wall (321)；The external mold outer wall (322) includes two
The the first, second slope surface wall (323-1,323-3) and top wall (323-2) of radial symmetric setting；The branch hold mode (330) is one
Group, every group two, two branch hold modes (330) with group are symmetrical arranged；The inner wall of each hold mode has and the slope surface wall
The shape that (323-1,323-3) matches, so that applying power close to each other by two branch hold modes (330) to same group come steady
Gu the external mold (320).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910549218.5A CN110314973B (en) | 2019-06-24 | 2019-06-24 | Die for preparing heat exchanger pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910549218.5A CN110314973B (en) | 2019-06-24 | 2019-06-24 | Die for preparing heat exchanger pipe fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110314973A true CN110314973A (en) | 2019-10-11 |
| CN110314973B CN110314973B (en) | 2021-04-23 |
Family
ID=68120126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910549218.5A Active CN110314973B (en) | 2019-06-24 | 2019-06-24 | Die for preparing heat exchanger pipe fitting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110314973B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6240937A (en) * | 1985-08-20 | 1987-02-21 | Hideo Suzuki | Working device for hydraulic bulge in utilizing rubber film |
| US20020056195A1 (en) * | 1998-01-23 | 2002-05-16 | Daimlerchrysler Ag | System for manufacturing built-up camshafts |
| US20030008171A1 (en) * | 2001-05-31 | 2003-01-09 | Kawasaki Stell Corporation | Welded steel pipe having excellent hydroformability and method for making the same |
| JP2013238379A (en) * | 2012-05-17 | 2013-11-28 | Mitsubishi Electric Corp | Heat exchanger |
| CN108723276A (en) * | 2018-07-24 | 2018-11-02 | 浙江裕泰汽车配件有限公司 | Ball stud Combined mold for processing |
| CN108981425A (en) * | 2017-06-02 | 2018-12-11 | 丰田自动车株式会社 | Heat exchanger and waste heat recovery structure |
-
2019
- 2019-06-24 CN CN201910549218.5A patent/CN110314973B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6240937A (en) * | 1985-08-20 | 1987-02-21 | Hideo Suzuki | Working device for hydraulic bulge in utilizing rubber film |
| US20020056195A1 (en) * | 1998-01-23 | 2002-05-16 | Daimlerchrysler Ag | System for manufacturing built-up camshafts |
| US20030008171A1 (en) * | 2001-05-31 | 2003-01-09 | Kawasaki Stell Corporation | Welded steel pipe having excellent hydroformability and method for making the same |
| JP2013238379A (en) * | 2012-05-17 | 2013-11-28 | Mitsubishi Electric Corp | Heat exchanger |
| CN108981425A (en) * | 2017-06-02 | 2018-12-11 | 丰田自动车株式会社 | Heat exchanger and waste heat recovery structure |
| CN108723276A (en) * | 2018-07-24 | 2018-11-02 | 浙江裕泰汽车配件有限公司 | Ball stud Combined mold for processing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110314973B (en) | 2021-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10358958B2 (en) | Exhaust gas heat exchanger and sealing device for the same | |
| RU2344930C2 (en) | Method for manufacture of heat-insulating pipelines and heat-insulating pipelines for transportation of hot or cold fluids | |
| US9631875B2 (en) | Heat exchanger for cooling a fluid of an internal combustion engine, assembly with at least one heat exchanger and method for manufacturing a heat exchanger | |
| EA001527B1 (en) | A heat exchanger | |
| DE19510847C2 (en) | Plate heat exchanger | |
| CN1094156A (en) | The improvement of plate type heat exchanger | |
| FI109148B (en) | plate heat exchangers | |
| KR20170082433A (en) | Device for heat transfer | |
| CN105928399A (en) | Blowing expansion type plate heat exchanger and manufacturing method thereof | |
| CN110314973A (en) | It is used to prepare the mold of heat exchanger pipe fitting | |
| CN110530188A (en) | The pipe fitting of heat exchanger | |
| RU2262054C2 (en) | Heat exchange apparatus | |
| CN108266568B (en) | A kind of thermal management assemblies | |
| CN1163723C (en) | Counterflow evaporator for refrigerants | |
| CN103480248A (en) | Refrigeration type drying machine | |
| CN203620485U (en) | Freezing dryer | |
| CN104949566B (en) | A kind of helical baffles and its shell-and-tube heat exchanger | |
| CN102564170A (en) | Tube type heat exchanger | |
| CA2364931A1 (en) | Bolted joint for rotor disks and method of reducing thermal gradients therein | |
| US5866056A (en) | Method of forming a gasket with centering collar | |
| CN203893699U (en) | Heat exchange tube group of anti-freezing type closed cooling equipment | |
| CN202470835U (en) | Tubular heat exchanger | |
| ITTO20100533A1 (en) | UNCOUPLING JOINT FOR DISCHARGE PIPES OF ENDOTHERMIC MOTORS | |
| BR0117089A (en) | Method and structure for connecting difficult-to-join pipes for use at elevated temperature | |
| CN207675013U (en) | A kind of dehydration and heat exchange of petroleum gas processing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |