CN208419696U - A kind of high life multisystem plate heat exchanger - Google Patents
A kind of high life multisystem plate heat exchanger Download PDFInfo
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- CN208419696U CN208419696U CN201820612477.9U CN201820612477U CN208419696U CN 208419696 U CN208419696 U CN 208419696U CN 201820612477 U CN201820612477 U CN 201820612477U CN 208419696 U CN208419696 U CN 208419696U
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Abstract
A kind of high life multisystem plate heat exchanger of the utility model includes successively upper cover plate, heat exchanger fin and lower cover plate, and above-mentioned heat exchanger fin includes a variety of patterns, and each pattern heat exchanger fin stacks in a certain order forms multiple independent heat-exchange systems；Above-mentioned multiple independent heat-exchange systems include at least two high pressure chests, at least two high pressure toroidal cavities, at least two high pressure runners, at least one low pressure chamber, at least one low pressure runner, at least two high pressure heat exchange medium dispensing orifices, at least one low pressure heat transferring medium dispensing orifice；The micro-bulge with continuous curvature is respectively set in above-mentioned each high pressure toroidal cavity and high pressure heat exchange medium dispensing orifice, and above-mentioned high pressure heat exchange medium dispensing orifice has certain taper, the pressure difference between each high pressure annular chamber and low pressure runner can be effectively reduced.It is also provided with stiffening ring in above-mentioned each high pressure toroidal cavity, this further improves multisystem plate heat exchanger service lifes.
Description
Technical field
The utility model relates to plate heat exchangers, and in particular to a kind of high life multisystem plate heat exchanger.
Background technique
Plate heat exchanger is that liquid-liquid, liquid-vapour carry out the ideal equipment of heat exchange, high with heat exchanger effectiveness,
The series of advantages such as heat loss is small, advantages of compact and light structure, the small, long service life of occupied area, thus be widely used in metallurgy,
The departments such as mine, petroleum, chemical industry, electric power, medicine, food, chemical fibre, papermaking, light textile, ship, heat supply.Also, it can be used for adding
The various situations such as heat, cooling, evaporation, condensation, sterilizing, waste heat recycling.
Plate heat exchanger can be divided into single system plate heat exchanger and multisystem plate heat exchanger according to heat-exchange system quantity.But
System plate heat exchanger is usually the converting heat between two kinds of heat transferring mediums, and multisystem plate heat exchanger be usually two kinds with
Converting heat between upper heat transferring medium.Comparatively, to have two or more various heat exchange media same for multisystem plate heat exchanger
The function of Shi Huanre is equivalent to while using multiple single system plate heat exchangers, thus multisystem plate heat exchanger has space
It is compact-sized, the advantages that heat exchange efficiency is high.Single system plate heat exchanger generallys use two kinds of mutually conjugate heat exchange of surface detail
Piece stacks gradually, and forms two kinds of heat exchange cavitys, thus its structure is simpler, and fatigue endurance controllability is preferable.It is opposite and
Speech, multisystem plate heat exchanger need to be stacked gradually using the different heat exchanger fin of two or more surface details, form two or more change
Hot cavity, thus its structure is complex, fatigue endurance controllability is poor.To make each heat exchange cavity of multisystem plate heat exchanger
Ordered arrangement, the higher heat transferring medium of pressure change after being usually stored in high pressure toroidal cavity first through the inflow of high-pressure medium dispensing orifice
Hot chamber since existing high pressure annular cavity surface is for plane and without respective support structure, thus works as the lower high pressure heat exchange of flow velocity
Media aggregates make multisystem at this point, high pressure toroidal cavity and the lesser low pressure chamber of heat transferring medium pressure easily form larger pressure difference
Plate heat exchanger is in low-cycle fatigue status, and product reliability is poor.
For big pressure difference existing between high pressure toroidal cavity and low pressure chamber, the solution of the prior art is in high compression ring
Setting is asked using the blocky metal washer of mach annular though can solve multisystem plate heat exchanger fatigue cracking in shape chamber
Topic, but it is with the disadvantages of multisystem heat exchanger total quality weight, metal washer machining cost is high, and it is not fundamentally
Solve big pressure reduction problem.
Therefore, the high life multisystem plate heat exchanger for developing a kind of low voltage difference high intensity is those skilled in the art's needs
Thinking.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of high life multisystem plate for the above-mentioned prior art
Formula heat exchanger and its implementation can effectively reduce the pressure difference between high pressure toroidal cavity and low pressure runner, and have simple
Easy reinforcement measure improves existing multisystem plate heat exchanger service life.
The technical scheme in the invention for solving the above technical problem are as follows: a kind of high life multisystem plate heat exchanger,
It is characterized by: including successively upper cover plate, heat exchanger fin and lower cover plate, above-mentioned heat exchanger fin includes a variety of patterns, each pattern heat exchanger fin
It stacks in a certain order and forms multiple independent heat-exchange systems；Above-mentioned multiple independent heat-exchange systems include at least two high pressure chests, extremely
Few two kinds of high pressure toroidal cavities, at least two high pressure runners, at least one low pressure chamber, at least one low pressure runner, at least two
High pressure heat exchange medium dispensing orifice, at least one low pressure heat transferring medium dispensing orifice；The higher heat transferring medium of pressure is respectively through above-mentioned each height
Above-mentioned each high pressure runner, pressure are respectively enterd by each high pressure heat exchange medium dispensing orifice after pressure chamber, above-mentioned each high pressure toroidal cavity
Lower heat transferring medium enters above-mentioned low pressure runner by low pressure heat transferring medium dispensing orifice after above-mentioned low pressure chamber, and pressure is different
Various heat transferring mediums complete heat exchange in respective runner；Above-mentioned each high pressure toroidal cavity and high pressure heat exchange medium dispensing orifice point
She Zhi not be with the micro-bulge of continuous curvature, which raises the flowing velocities of heat transferring medium in each high pressure toroidal cavity, reduce
Pressure difference between each high pressure annular chamber and low pressure runner；Above-mentioned high pressure heat exchange medium dispensing orifice has certain taper, can be into one
Step reduces the pressure difference between each high pressure annular chamber and low pressure runner.
Preferably, above-mentioned high life multisystem plate heat exchanger further includes stiffening ring, and it is board-like to be installed on above-mentioned multisystem
In each high pressure toroidal cavity of heat exchanger, which reduce each high pressure toroidal cavities because of stress caused by pressure difference.
Specifically, above-mentioned stiffening ring is the annular corrugated circle with periodically convex and lower concave plane, thereon convex flat face and
The upper plane that each high pressure toroidal cavity is distinguished in lower concave plane is connect by the way of welding with lower plane；The wave number of above-mentioned stiffening ring
It can be arranged according to the reduction and high pressure heat exchange medium distributing trough inlet opening size for reinforcing loop material.
Further, condition is arranged in above-mentioned stiffening ring wave number are as follows: reinforces reduction≤25% of loop material, stiffening ring and each
The heat transferring medium circulation region minimum area that high pressure toroidal cavity is formed is greater than high pressure heat exchange medium dispensing orifice feed liquor open area, adds
The installation site enclosed by force can guarantee the smooth circulation of high pressure heat exchange medium.
Preferably, above-mentioned each high pressure annular cavity sidewalls have the micro-bulge structure of continual curvature, when the height of same traffic
When pressure heat transferring medium flows through above-mentioned micro-bulge structure, flowing velocity of the high pressure heat exchange medium relative to each high pressure annular cavity sidewalls
Increase, thus the pressure decline of high pressure heat exchange medium, the pressure difference between high pressure toroidal cavity and low pressure runner is subtracted as a result,
It is small.
Preferably, micro-bulge structure of the above-mentioned each high pressure heat exchange medium dispensing orifice inner wall with continual curvature, and each low pressure
Heat transferring medium dispensing orifice inner wall is without micro-bulge structure.Thus the high pressure heat exchange medium of same traffic flows through the distribution of high pressure heat exchange medium
Flowing velocity when hole improves again, and the pressure of high pressure heat exchange medium declines again, as a result, high pressure toroidal cavity and low pressure
Pressure difference between runner reduces again.
Further, above-mentioned high pressure heat exchange medium dispensing orifice feed liquor open area is greater than liquid outlet area, i.e., each high pressure heat exchange
Medium dispensing orifice or adjacent plate, which weld the high pressure heat exchange medium distributing trough to form high pressure heat exchange medium dispensing orifice, to be had centainly
Taper, and low pressure heat transferring medium dispensing orifice feed liquor open area is equal to liquid outlet area, i.e. low pressure heat transferring medium dispensing orifice or phase
Adjacent heat exchanger fin welds the low pressure heat transferring medium distributing trough zero draft to form low pressure heat transferring medium dispensing orifice；Work as same traffic as a result,
High-pressure medium heat transferring medium flows through high pressure heat exchange medium dispensing orifice, and constantly flowing velocity further increases, the pressure of high pressure heat exchange medium
Power further declines, and the pressure difference between high pressure toroidal cavity and low pressure runner further decreases as a result,.
Specifically, each high pressure heat exchange medium dispensing orifice or adjacent plate weld the height to form high pressure heat exchange medium dispensing orifice
Pressure heat transferring medium distributing trough range of taper is 1:12~1:11.
Compared with the prior art, the advantages of the utility model are:
(1) each high pressure annular cavity sidewalls of the utility model have continuous curvature micro-bulge, can effectively improve high pressure and change
The flowing velocity of thermal medium reduces the pressure that high pressure heat exchange medium acts on high pressure annular cavity sidewalls, and it is empty to reduce high pressure annular
The pressure difference of chamber and low pressure runner；
(2) each high pressure heat exchange medium dispensing orifice inner wall has continuous curvature micro-bulge in the utility model, can mention again
The flowing velocity of high high pressure heat exchange medium reduces the pressure that high pressure heat exchange medium acts on high pressure heat exchange medium dispensing orifice inner wall,
Reduce the pressure difference of high pressure toroidal cavity and low pressure runner again；
(3) each high pressure heat exchange medium dispensing orifice or adjacent plate weld to form high pressure heat exchange medium point in the utility model
The high pressure heat exchange medium distributing trough of distribution has certain taper, can be further improved high pressure heat exchange media flow speed, into
The pressure difference of one step reduction high pressure toroidal cavity and low pressure runner；
(4) stiffening ring is set in each high pressure toroidal cavity in the utility model, high pressure annular chamber can be reduced because pressure difference draws
The stress risen, further increases multisystem heat exchanger service life.
(5) mode that mould punching can be used in the stiffening ring in the utility model is produced in batches, thus cost is relatively low.
Detailed description of the invention
Fig. 1 is the utility model high life multisystem plate heat exchanger cavity and runner schematic diagram, and wherein a is No.1 high pressure
Chamber, b are No.1 high pressure toroidal cavity, f is No. two high pressure toroidal cavities, g is No. two high pressure chests, h is low pressure runner, and j is No.1
High pressure runner, k are low pressure chamber, m is No. two high pressure runners；
Fig. 2 is the utility model high life multisystem plate heat exchanger structural schematic diagram, wherein 1 being upper cover plate, 2 being heat exchange
Piece, 3 be lower cover plate, 4 be stiffening ring, 1.1 be No.1 high pressure entry/exit fluid apertures, 1.2 be low pressure entry/exit fluid apertures, 1.3 be No. two height
Be pressed into/fluid hole, 2.1 be No.1 heat exchanger fin, 2.2 be No. two heat exchanger fins, 2.3 be No. three heat exchanger fins, 2.4 be No. four heat exchanger fins；
Fig. 3 is one, No. two high pressure annular chamber schematic diagram of the utility model high life multisystem plate heat exchanger；
Fig. 4 is the utility model high life multisystem plate heat exchanger high pressure heat exchange medium dispensing orifice schematic diagram；
Fig. 5 is the utility model high life multisystem plate heat exchanger low pressure heat transferring medium dispensing orifice schematic diagram；
Fig. 6 is the utility model high life multisystem plate heat exchanger low pressure heat transferring medium distributing trough schematic diagram；
Fig. 7 is the utility model high life multisystem plate heat exchanger high pressure heat exchange medium distributing trough schematic diagram；
Fig. 8 is the signal of the utility model high life multisystem plate heat exchanger high pressure heat exchange medium distributing trough partial enlargement
Figure；
Fig. 9 is the utility model high life multisystem plate heat exchanger stiffening ring schematic diagram.
Specific embodiment
The utility model is described in further detail below in conjunction with figure embodiment.
What it is firstly the need of explanation is that multisystem plate heat exchanger has two or more independent heat-exchange systems, Fig. 1-9
Shown in tool there are two the heat exchangers of independent heat-exchange system to be given for example only the purpose of explanation.Multisystem in the present embodiment is board-like
Heat exchanger specific structure successively includes upper cover plate 1, heat exchanger fin 2 and lower cover plate 3, as shown in Figure 2；Above-mentioned heat exchanger fin 1 can be divided into one
Number heat exchanger fin of heat exchanger fin 2.2, three 2.3, No. four heat exchanger fins, 2.4 4 kinds of forms of heat exchanger fin 2.1, two, each model heat exchanger fin are pressed
One graded stacking is respectively formed No.1 high pressure chest a, No.1 high pressure toroidal cavity b, No. two high pressure annular cavity fs, No. two high pressures
Chamber g, low pressure runner h, No.1 high pressure runner j, low pressure chamber k and No. two high pressure runner m, high pressure heat exchange medium dispensing orifice and low pressure are changed
Thermal medium dispensing orifice, as shown in Figure 2；The higher two kinds of heat transferring mediums A and C of pressure is respectively through No.1 high pressure chest a, No.1 high compression ring
No.1 height is respectively enterd by high pressure heat exchange medium dispensing orifice after shape cavity b and No. two high pressure chest g, No. two high pressure annular cavity fs
Press runner j and No. two high pressure runner m, the lower heat transferring medium B of pressure after low pressure chamber k by low pressure heat transferring medium dispensing orifice into
Enter low pressure runner h, three kinds of different heat transferring mediums of pressure complete heat exchange in respective runner；Above-mentioned No.1 high pressure annular is empty
The micro-bulge with continuous curvature is respectively set in chamber b, No. two high pressure annular cavity fs and high pressure heat exchange medium dispensing orifice, improves
The flowing velocity of heat transferring medium in one, No. two high pressure toroidal cavity, reduce one, No. two high pressure annular chamber and low pressure runner it
Between pressure difference；Above-mentioned high pressure heat exchange medium dispensing orifice have certain taper, can further decrease one, No. two high pressure annular chamber with
Pressure difference between low pressure runner.
Above-mentioned multisystem plate heat exchanger further includes the stiffening ring being arranged in one, No. two high pressure toroidal cavity, such as Fig. 9 institute
Show, one, No. two high pressure toroidal cavity can be reduced because of stress caused by pressure difference, further increase making for multisystem plate heat exchanger
Use the service life.Above-mentioned stiffening ring is the annular corrugated circle with periodically convex and lower concave plane, convex plane and lower concave plane point
It is not connect by the way of welding with the upper plane of one, No. two high pressure toroidal cavity with lower plane；The wave number of above-mentioned stiffening ring can
It is arranged according to the reduction and high pressure heat exchange medium dispensing orifice inlet opening size of reinforcing loop material, reinforces loop material in the present embodiment
Reduction≤25% of material, stiffening ring and the heat transferring medium circulation region minimum area that one, No. two high pressure toroidal cavity is formed are big
In high pressure heat exchange medium distributing trough feed liquor open area, and the installation site of stiffening ring must not influence the smooth stream of high pressure heat exchange medium
It is logical.
Above-mentioned one, No. two high pressure annular cavity sidewalls has the micro-bulge structure of continual curvature, as shown in figure 3, when identical
When the high pressure heat exchange medium of flow flows through above-mentioned micro-bulge structure, high pressure heat exchange medium is relative to one, No. two high pressure toroidal cavity
The flowing velocity of side wall increases, thus the pressure decline of high pressure heat exchange medium, as a result, between high pressure toroidal cavity and low pressure runner
Pressure difference reduced.
Above-mentioned high pressure heat exchange medium dispensing orifice inner wall has the micro-bulge structure of continual curvature, as shown in figure 4, and low pressure is changed
Thermal medium dispensing orifice inner wall is without micro-bulge structure, as described in Figure 5.Thus the high pressure heat exchange medium of same traffic flows through high pressure heat exchange
Flowing velocity when medium dispensing orifice improves again, and the pressure of high pressure heat exchange medium declines again, and high pressure annular is empty as a result,
Pressure difference between chamber and low pressure runner reduces again.
Further, high pressure heat exchange medium dispensing orifice feed liquor open area is greater than liquid outlet area, i.e. high pressure heat exchange medium point
Distribution or adjacent plate, which weld the high pressure heat exchange medium distributing trough to form high pressure heat exchange medium dispensing orifice, has certain taper
As shown in Figure 7 and Figure 8, in the present embodiment, taper value 1:11；Low pressure heat transferring medium dispensing orifice feed liquor open area is equal to liquid outlet
Area, i.e. low pressure heat transferring medium dispensing orifice or adjacent plate weld the low pressure heat transferring medium to form low pressure heat transferring medium dispensing orifice
Distributing trough zero draft, as shown in Figure 6；As a result, when same traffic high-pressure medium heat transferring medium flows through high pressure heat exchange medium dispensing orifice
Constantly flowing velocity further increases, and the pressure of high pressure heat exchange medium further declines, as a result, high pressure toroidal cavity and lowpressure stream
Pressure difference between road further decreases.
The implementation method of above-mentioned high life multisystem plate heat exchanger, specifically includes the following steps:
(1) it stocks up: preparing stainless steel substrates, the copper foil of corresponding size；
(2) corresponding stainless steel substrates punching press heat exchanger fin: are washed into the heat exchanger fin of respective model using press machine；
(3) corresponding stainless steel substrates punching press stiffening ring: are filled into the stiffening ring of respective model using press machine；
(4) one layer of copper film, copper film thickness 0.05mm copper facing: are plated on above-mentioned stiffening ring surface using electroplating technology；
(5) pre-assembled: above-mentioned upper cover plate, each model heat exchanger fin, stiffening ring, copper foil, lower cover plate are pre-installed in certain sequence
Match；
(6) precompressed: using the above-mentioned pre- multisystem plate heat exchanger of press machine precompressed, and precompression is set as 2MPa；
(7) it is brazed: above-mentioned precompressed multisystem plate heat exchanger being put into vacuum drying oven and is brazed, furnace temperature is 1135 DEG C, pricker
Welding the time is 9 hours；
(8) quality inspection quality inspection: is carried out to above-mentioned block fluid distributor by national standard or professional standard or company standard
It looks into.Quality inspection links are interspersed in each manufacturing process；
In addition to the implementation, the utility model further includes having other embodiments, all to use equivalents or equivalent
The technical solution that alternative is formed, should all fall within the protection scope of the utility model claims.
Claims (8)
1. a kind of high life multisystem plate heat exchanger, it is characterised in that: successively include upper cover plate, heat exchanger fin and lower cover plate, institute
It states heat exchanger fin and stacks in a certain order and form multiple independent heat-exchange systems；Above-mentioned multiple independent heat-exchange systems include two kinds of high pressures
Chamber, two kinds of high pressure toroidal cavities, two kinds of high pressure runners, a kind of low pressure chamber, a kind of low pressure runner, two kinds of high pressure heat exchange medium distribution
Hole and a kind of low pressure heat transferring medium dispensing orifice；The higher heat transferring medium of pressure is respectively through above-mentioned each high pressure chest, above-mentioned each high pressure annular
Above-mentioned each high pressure runner is respectively enterd by each high pressure heat exchange medium dispensing orifice after cavity, the lower heat transferring medium of pressure is through above-mentioned
Above-mentioned low pressure runner is entered by low pressure heat transferring medium dispensing orifice after low pressure chamber, the different various heat transferring mediums of pressure are in each gravity flow
Heat exchange is completed in road；
The micro-bulge with continuous curvature is respectively set in above-mentioned each high pressure toroidal cavity and high pressure heat exchange medium dispensing orifice；
Above-mentioned high pressure heat exchange medium dispensing orifice has certain taper, can further decrease each high pressure annular chamber and low pressure runner it
Between pressure difference.
2. a kind of high life multisystem plate heat exchanger according to claim 1, it is characterised in that: further include:
Stiffening ring is installed in each high pressure toroidal cavity of above-mentioned multisystem plate heat exchanger, and which reduce each high pressure toroidal cavities
Because of stress caused by pressure difference.
3. a kind of high life multisystem plate heat exchanger according to claim 2, it is characterised in that: above-mentioned stiffening ring is tool
There is the annular corrugated circle of periodically convex and lower concave plane, the upper of each high pressure toroidal cavity is distinguished with lower concave plane in convex flat face thereon
Plane is connect by the way of welding with lower plane；The wave number of above-mentioned stiffening ring can be according to the reduction and high pressure for reinforcing loop material
The setting of heat transferring medium distributing trough inlet opening size.
4. a kind of high life multisystem plate heat exchanger according to claim 3, it is characterised in that: above-mentioned stiffening ring wave number
Setting condition are as follows: reinforce the heat transferring medium circulation that reduction≤25%, stiffening ring and each high pressure toroidal cavity of loop material are formed
Region minimum area is greater than high pressure heat exchange medium dispensing orifice feed liquor open area, the installation site of stiffening ring can guarantee that high pressure heat exchange is situated between
The smooth circulation of matter.
5. a kind of high life multisystem plate heat exchanger according to claim 1, it is characterised in that: above-mentioned each high pressure annular
Cavity sidewalls have the micro-bulge structure of continual curvature, and the micro-bulge structure function is to improve the high pressure heat exchange for flowing through its surface
Media flow speed reduces heat transferring medium and acts on each high pressure annular cavity sidewalls pressure.
6. a kind of high life multisystem plate heat exchanger according to claim 1, it is characterised in that: above-mentioned each high pressure heat exchange
Medium dispensing orifice inner wall has the micro-bulge structure of continual curvature, and the micro-bulge structure function is to improve to flow through high pressure again
The flowing velocity of heat transferring medium dispensing orifice inner wall reduces high pressure heat exchange medium and acts on wall pressure in each high pressure heat exchange medium dispensing orifice
Power.
7. a kind of high life multisystem plate heat exchanger according to claim 1, it is characterised in that: above-mentioned each high pressure heat exchange
Medium dispensing orifice feed liquor open area is greater than liquid outlet area, i.e., each high pressure heat exchange medium dispensing orifice or adjacent plate weld to be formed
The high pressure heat exchange medium distributing trough of high pressure heat exchange medium dispensing orifice has certain taper, and effect is to further increase to flow through height
The flowing velocity of heat transferring medium dispensing orifice inner wall is pressed, high pressure heat exchange medium is reduced and acts on each high pressure heat exchange medium dispensing orifice inner wall
Pressure.
8. a kind of high life multisystem plate heat exchanger according to claim 7, it is characterised in that: above-mentioned high pressure heat exchange is situated between
Matter dispensing orifice or above-mentioned high pressure heat exchange medium distributing trough range of taper are 1:12~1:10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820612477.9U CN208419696U (en) | 2018-04-26 | 2018-04-26 | A kind of high life multisystem plate heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820612477.9U CN208419696U (en) | 2018-04-26 | 2018-04-26 | A kind of high life multisystem plate heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208419696U true CN208419696U (en) | 2019-01-22 |
Family
ID=65117160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820612477.9U Withdrawn - After Issue CN208419696U (en) | 2018-04-26 | 2018-04-26 | A kind of high life multisystem plate heat exchanger |
Country Status (1)
| Country | Link |
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| CN (1) | CN208419696U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108332588A (en) * | 2018-04-26 | 2018-07-27 | 江苏宝得换热设备股份有限公司 | A kind of high life multisystem plate heat exchanger and its implementation |
-
2018
- 2018-04-26 CN CN201820612477.9U patent/CN208419696U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108332588A (en) * | 2018-04-26 | 2018-07-27 | 江苏宝得换热设备股份有限公司 | A kind of high life multisystem plate heat exchanger and its implementation |
| CN108332588B (en) * | 2018-04-26 | 2023-09-22 | 江苏宝得换热设备股份有限公司 | Long-service-life multi-system plate heat exchanger and implementation method thereof |
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Granted publication date: 20190122 Effective date of abandoning: 20230922 |