CN207317569U - A kind of enclosed cooling tower prewarming circulating system - Google Patents
A kind of enclosed cooling tower prewarming circulating system Download PDFInfo
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- CN207317569U CN207317569U CN201721301007.2U CN201721301007U CN207317569U CN 207317569 U CN207317569 U CN 207317569U CN 201721301007 U CN201721301007 U CN 201721301007U CN 207317569 U CN207317569 U CN 207317569U
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- 238000001816 cooling Methods 0.000 title claims abstract description 88
- 238000012802 pre-warming Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 145
- 230000000694 effects Effects 0.000 description 7
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000009746 freeze damage Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model belongs to enclosed cooling tower technical field.Disclose a kind of enclosed cooling tower prewarming circulating system, including enclosed cooling tower, the hot water mouth of system to be cooled and cold water outlet, one end of enclosed cooling tower is connected by hot water line with hot water mouth, the other end is connected by cold water pipeline with cold water outlet, and hot water line and cold water pipeline are connected with prewarming circulating system；Prewarming circulating system includes first circulation pump, the 5th shut-off valve, circulation line and the 4th pipeline for draining, first circulation pumps and the 5th shut-off valve is arranged on circulation line, one end of circulation line is connected on hot water line, the other end is connected on cold water pipeline, and one end of the 4th pipeline is connected with hot water line and circulation line.The utility model can avoid introducing high-power external heat source, to melt the ice cube in enclosed cooling tower pipeline, enabling enclosed cooling tower to work normally.
Description
Technical field
It the utility model is related to enclosed cooling tower technical field, more particularly to a kind of enclosed cooling tower warm-up cycle system
System.
Background technology
Closed cooling tower (being also evaporating air cooler or closed cooling tower) is that pipe heat exchanger is placed in tower, is passed through
The heat exchange of the air of circulation, shower water and recirculated water ensures cooling-down effect.The characteristics of closed cooling tower is maximum is to avoid nature
The cooling water of bound pair high cleanliness requirement pollutes, saves water resource.But closed cooling tower run in the winter time in due to environment
Temperature is very low, is very easy to that freeze injury occurs when water system intermittent duty, in addition using pure water medium, it is easier to freeze, cause
The heat dissipation copper pipe rupture of cooling tower, can not work normally.
A kind of closed cooling tower frost-resisting device in the prior art, increases air purge set, utilizes the impact of gas
The ponding in pipeline, the particularly ponding in heat dissipation copper pipe are removed, prevents closed cooling tower from freeze injury occurs, meets that system interval is transported
Capable requirement.
But existing closed cooling tower heat exchange coil is all parallel to horizontal plane design, it is contemplated that heat transfer effect, is changed
Hot coil is all than relatively thin, it is necessary to which emptying internal liquid reaches antifreezing effect when temperature is less than 0 DEG C, cooler is interior because local water
Power loss is excessive, i.e., is blown using air compressor machine and can not all drained internal liquid repeatedly, can also deposited inside heat exchange coil single cell
It in partially liq, will freeze, when needing cooling again, since there are ice cube in pipe cooling system hot and cold water will be hindered to hand over
Change, so as to influence the normal work of closed cooling tower.
Based on the above problem, there are many producers to be preheated by being introduced into external heat source to pipeline in closed cooling tower at present,
Since the hot removable disk pipe pipeline of cooling tower is longer, when melting to its ice fraction, it is necessary to consume more energy, therefore
Introducing external heat source needs relatively high power, economically less desirable.
In consideration of it, there is an urgent need for designing the prewarming circulating system before a kind of enclosed cooling tower starts, external heat source is not being introduced
In the case of, the ice cube that undischarged water is formed in its pipeline is accumulated in after stopping using enclosed cooling tower before can melting,
Ensure the follow-up work of enclosed cooling tower, reach preferable energy-saving effect, so as to save cost.
Utility model content
One purpose of the utility model is to provide a kind of enclosed cooling tower prewarming circulating system, to solve existing skill
The water accumulated in art in enclosed cooling tower pipeline forms the problem of ice cube influences its normal work, and can also avoid necessary
High-power external heat source is introduced to melt the problem of water accumulated in enclosed cooling tower pipeline forms ice cube.
The utility model uses following technical scheme：
A kind of enclosed cooling tower prewarming circulating system, including enclosed cooling tower, the hot water mouth of system to be cooled and cold
The mouth of a river, one end of the enclosed cooling tower are connected by hot water line with the hot water mouth, the enclosed cooling tower it is another
One end is connected by cold water pipeline with cold water outlet, and the hot water line and the cold water pipeline are connected with prewarming circulating system；
The prewarming circulating system includes first circulation pump, the 5th shut-off valve, circulation line and the 4th pipe for draining
Road, the first circulation pump and the 5th shut-off valve are arranged on circulation line, and one end of the circulation line is connected in heat
In water lines, the other end is connected on cold water pipeline, and one end and the hot water line and circulation line of the 4th pipeline connect
It is logical；
The first shut-off valve is provided with the hot water line, first shut-off valve is arranged on the hot water mouth and described
Between four pipelines and the tie point of the hot water line；
It is provided with the second shut-off valve on the cold water pipeline, second shut-off valve is arranged on the cold water outlet and described follows
Between the tie point of endless tube road and the cold water pipeline；
The 6th shut-off valve is provided with 4th pipeline.
After this structure, in the case where not quoting high-power external heat source, using needing to cool down in system to be cooled
Hot water as heat source, and be incorporated into prewarming circulating system, it is possible to achieve the water accumulated in enclosed cooling tower pipeline is formed
Ice cube have also achieved energy saving effect while melted.
Specifically, the circulation line includes the second pipeline and the 3rd pipeline, and one end of second pipeline is connected in institute
State on hot water line, one end of the 3rd pipeline is connected on the cold water pipeline, the other end of second pipeline and institute
State the other end connection of the 3rd pipeline；The first circulation pump is provided with second pipeline；Set on 3rd pipeline
There are the 5th shut-off valve and the second check valve, second check valve is used to make the recirculated water in the 3rd pipeline to flow into institute
State the second pipeline.
After this structure, the hot water of introducing is realized and recycle, fully melt and accumulate in enclosed cooling water
The ice cube that the water accumulated in tower tube road is formed, and then ensure the normal use of closed cooling tower water tower.
Specifically, the circulation line further includes the first pipeline, and one end of first pipeline is connected to the hot water mouth
Between first shut-off valve, the company of the other end of the other end and the 3rd pipeline of its other end and second pipeline
Contact is connected；
The 3rd shut-off valve and the first check valve are provided with first pipeline, first check valve is used to make the first pipe
Recirculated water in road flows into second pipeline.
After this structure, the first pipeline introduces hot water, can extend the service life of hot water line.
3rd shut-off valve is positioned close at first pipeline and the tie point of the hot water line, and described first
Check valve is arranged far from first pipeline and the tie point of the hot water line.
After this structure, when hot water need not be introduced into the first pipeline, it is possible to reduce to the first check valve
Compression shock, plays a protective role the first check valve, extends the service life of the first check valve.
Specifically, second circulation pump is additionally provided with the 4th pipeline.
After this structure, it is cold that the ice cube in the enclosed cooling tower and the water after thawing can thoroughly exclude enclosed
But water tower pipeline.
Specifically, one end that the 4th pipeline is not connected with the hot water line is connected with collecting tank.
Specifically, it is additionally provided with the 4th shut-off valve on second pipeline.
After this structure, the flow for being passed through the second pipeline can be controlled.
Specifically, the enclosed cooling tower is provided with the first temperature sensor and the 3rd pipeline is provided with the second temperature
Spend sensor.
After this structure, the ice melting journey in enclosed cooling tower in pipeline can be determined by the temperature measured
Degree, to determine that enclosed cooling tower can work normally, it is desired nonetheless to exhaust recirculated water and be introduced back into hot water, continue to enclosed
The pipeline of cooling tower carries out warm-up cycle.
Specifically, it is additionally provided with flowmeter in the enclosed cooling tower.
After this structure, the flowmeter that can be obtained according to flow measurement calculates the circulation accumulated in enclosed cooling tower
The volume of water, needs to stop the hot water beyond circulation line after certain volume is reached and enters in enclosed cooling tower.
Further, the circulation line is provided with insulating layer.
After this structure, the loss of the recirculated water heat in circulation line can be reduced, reduces hot water as far as possible
Introducing.
The beneficial effects of the utility model：
Enclosed cooling tower prewarming circulating system in the utility model passes through on the basis of original enclosed cooling tower
Circulation line is added, can be realized in the case where not introducing external heat source by using the hot water in system to be cooled to closing
Formula cooling tower is melted using the ice that the water of rear accumulation is formed, so as to ensure the normal use of enclosed cooling tower, is reached
Preferable energy-saving effect.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of enclosed cooling tower prewarming circulating system provided by the utility model.
In figure：
11st, enclosed cooling tower；12nd, first circulation pumps；13rd, second circulation pumps；14th, collecting tank；15th, system to be cooled；
151st, hot water mouth；152nd, cold water outlet；
21st, the first shut-off valve；22nd, the second shut-off valve；23rd, the 3rd shut-off valve；24th, the 4th shut-off valve；25th, the 5th cut-off
Valve；26th, the 6th shut-off valve；
31st, the first check valve；32nd, the second check valve；
41st, the first pipeline；42nd, the second pipeline；43rd, the 3rd pipeline；44th, the 4th pipeline.
Embodiment
It is clearer for the technical solution and the technique effect that reaches that make technical problem that the utility model solves, use,
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.It is understood that
Specific embodiment described herein is used only for explaining the utility model, rather than the restriction to the utility model.In addition also need
It is noted that for the ease of description, illustrate only in attached drawing with the relevant part of the utility model and it is not all.
Present embodiment discloses a kind of enclosed cooling tower prewarming circulating system, as shown in Figure 1, including enclosed cooling tower
11, one end of enclosed cooling tower 11 is connected by hot water line with the hot water mouth 151 of system 15 to be cooled, and in hot water line
On be connected with the first shut-off valve 21, the other end of enclosed cooling tower 11 passes through cold water pipeline and the cold water outlet of system 15 to be cooled
152 connect, and are also connected with the second shut-off valve 22 on cold water pipeline, hot water line and cold water pipeline are connected with prewarming circulating system.
Above-mentioned enclosed cooling tower prewarming circulating system further includes the first pipeline 41, the second pipeline 42,43 and of the 3rd pipeline
4th pipeline 44.One end of first pipeline 41 is communicated in hot water line, and tie point is located at 151 and first shut-off valve 21 of hot water mouth
Between；One end of second pipeline 42 is communicated in hot water line, and tie point positioned at the first shut-off valve 21 and connects hot water line's
Between enclosed cooling tower 11；One end of 3rd pipeline 43 is communicated in cold water pipeline, and tie point is located at 22 He of the second shut-off valve
Between the enclosed cooling tower 11 for connecting cold water pipeline；The other end and the 3rd of the other end of first pipeline 41, the second pipeline 42
The other end of pipeline 43 is connected together by tee pipe coupling.
Wherein, the first pipeline 41 can replace hot water line to introduce hot water to prewarming circulating system, so as to extend hot-water line
The service life on road.And it is used to control the 3rd shut-off valve 23 of hot water break-make and control hot water by being provided with the first pipeline 41
First check valve 31 of flow direction, the 3rd shut-off valve 23 is positioned close to the first pipeline 41 and at hot water line's tie point, first is single
The first pipeline 41 is arranged far to valve 31 and at hot water line's tie point, the first check valve 31 is used to make in the first pipeline 41
Recirculated water flows into the second pipeline 42.Using this structure, can cause when hot water need not be introduced into the circulatory system, can be with
Play a protective role to the first check valve 31, reduce unnecessary compression shock, so as to extend the use longevity of the first check valve 31
Life.
Second pipeline 42 is provided with first circulation pump 12 and the 4th shut-off valve 24.The 5th cut-off is provided with 3rd pipeline 43
25 and second check valve 32 of valve, the 5th shut-off valve 25 are positioned close at the tie point of the 3rd pipeline 43 and cold water pipeline,
Second check valve 32 is arranged far from the tie point of the 3rd pipeline 43 and cold water pipeline, and the second check valve 32 is used to make the 3rd pipe
Recirculated water in road 43 flows into the second pipeline 42.After this structure, it can cause when the circulatory system is not required, can be right
Second check valve 32 plays a protective role, and reduces unnecessary compression shock, so as to extend the service life of the second check valve 32；
5th shut-off valve 25 is used for the connection and closing for controlling enclosed cooling tower prewarming circulating system.
4th pipeline, 44 one end is communicated in hot water line, and tie point is located at the first shut-off valve 21 and the second pipeline 42 and heat
Hot water line between the tie point of water lines, and the 6th shut-off valve 26 and second circulation pump 13 are provided with it, for following
The discharge of ring water；The other end of 4th pipeline 44 is connected with collecting tank 14, is realized the collection of recirculated water and is made after filtering again
With.
Preferably, the first pipeline 41, the second pipeline 42 and the 3rd pipeline 43 are both provided with insulating layer, for reducing circulation pipe
The loss of recirculated water heat in road, reduces the introducing of hot water as far as possible.
Also, enclosed cooling tower 11 is provided with the first temperature sensor (not shown), the 3rd pipeline 43 is provided with
Second temperature sensor (not shown), after this structure, enclosed cooling tower can be determined by the temperature measured
Ice melting degree in 11 in pipeline, to determine that enclosed cooling tower 11 can work normally, it is desired nonetheless to recirculated water is exhausted,
Continue to carry out warm-up cycle to the pipeline of enclosed cooling tower 11 again by hot water is introduced；Also set in enclosed cooling tower 11
Flowmeter is equipped with, for calculating the volume of the recirculated water accumulated in enclosed cooling tower 11 by monitoring flow, when reaching one
The hot water for determining to need to stop beyond circulation line after volume enters in enclosed cooling tower 11.
In addition, the first shut-off valve 21, the second shut-off valve 22, the 3rd shut-off valve 23, the 4th shut-off valve 24, the 5th shut-off valve 25
And/or the 6th shut-off valve 26 for pass through electric signal control shut-off valve.After this structure, can more it be accurately controlled each
The action of shut-off valve, so as to ensure that prewarming circulating system effectively works, and can also reduce manual operation, the degree of automation
It is high.
Operation principle：
When the ice cube in 11 pipeline of enclosed cooling tower, which carries out preheating, to be melted, 21, second sections of the first shut-off valve is closed
Only 22 and the 6th shut-off valve 26 of valve, opens first circulation and pumps the 12, the 3rd shut-off valve 23, the 4th shut-off valve 24 and the 5th shut-off valve
25, hot water in system 15 to be cooled sequentially enters hot water line, the first pipeline 41 by hot water mouth 151, the second pipeline 42, closes
Formula cooling tower 11, cold water pipeline, the 3rd pipeline 43 and the second pipeline 42, the second pipeline 42 can pass through the 3rd pipeline 43 at the same time
Recirculated water and the hot water that is introduced from hot water line of the first pipeline 41；When flowmeter monitors to enter in enclosed cooling tower 11
After hot water reaches certain volume, the 3rd shut-off valve 23 is closed, stops hot water and enters prewarming circulating system, when the first temperature sensor
Temperature be less than or equal to zero degree and it is roughly the same with the temperature that second temperature sensor measures when, at this time, the water in circulation line
The ice cube in the pipeline of enclosed cooling tower 11 cannot be melted, therefore open the 6th shut-off valve 26 and second circulation pump
13 discharge recirculated waters；The 6th shut-off valve 26 is then shut off, opens the hot water that the 3rd shut-off valve 23 is introduced into system 15 to be cooled, into
The warm-up cycle of 11 pipeline of row enclosed cooling tower, when the first temperature sensor temperature be more than zero degree and temperature it is on the rise,
Then 11 pipeline medium floe of enclosed cooling tower melts and finishes, and opens 13 discharge recirculated water of the 6th shut-off valve 26 and second circulation pump,
It is then shut off the 3rd shut-off valve 23, the 4th shut-off valve 24, the 5th shut-off valve 25 and the 6th shut-off valve 26 and first circulation pump 12
13 are pumped with second circulation, and opens the first shut-off valve 21 and the second shut-off valve 22 so that enclosed cooling tower 11 starts normally
Work, i.e., the hot water in system 15 to be cooled flows into the enclosed that can be worked normally cooling by hot water mouth 151 and hot water line
In water tower 11, by water after cooling by entering in cold water pipeline and cold water outlet 152 in system 15 to be cooled, so as to fulfill right
System 15 to be cooled is cooled down.
Embodiment of above is to elaborate the basic principle and characteristic of the utility model, and the utility model is from above-mentioned reality
The mode of applying limits, and on the premise of not departing from the spirit and scope of the utility model, the utility model also has various changes,
These changes and modifications are both fallen within claimed the scope of the utility model.The utility model requires protection scope is by appended
Claims and its equivalent thereof.
Claims (10)
1. a kind of enclosed cooling tower prewarming circulating system, including enclosed cooling tower (11), the enclosed cooling tower (11)
One end be connected by hot water line with the hot water mouth (151) of system to be cooled (15), the enclosed cooling tower (11) it is another
One end is connected by cold water pipeline with the cold water outlet (152) of system to be cooled (15), it is characterised in that the hot water line and institute
Cold water pipeline is stated to be connected with prewarming circulating system；
The prewarming circulating system include first circulation pump (12), the 5th shut-off valve (25), circulation line and for draining the
Four pipelines (44), the first circulation pump (12) and the 5th shut-off valve (25) are arranged on the circulation line, described to follow
The one end on endless tube road is connected on the hot water line, and the other end is connected on the cold water pipeline, the 4th pipeline (44)
One end connected with the hot water line and circulation line；
The first shut-off valve (21) is provided with the hot water line, first shut-off valve (21) is arranged on the hot water mouth
(151) between the 4th pipeline (44) and the tie point of the hot water line；
The second shut-off valve (22) is provided with the cold water pipeline, second shut-off valve (22) is arranged on the cold water outlet
(152) between the tie point of the circulation line and the cold water pipeline；
The 6th shut-off valve (26) is provided with 4th pipeline (44).
2. enclosed cooling tower prewarming circulating system according to claim 1, it is characterised in that the circulation line includes
Second pipeline (42) and the 3rd pipeline (43), one end of second pipeline (42) are connected on the hot water line, and described the
One end of three pipelines (43) is connected on the cold water pipeline, the other end and the 3rd pipeline of second pipeline (42)
(43) other end connection；
The first circulation pump (12) is provided with second pipeline (42)；
The 5th shut-off valve (25) and the second check valve (32), second check valve are provided with 3rd pipeline (43)
(32) it is used to the recirculated water in the 3rd pipeline (43) is flowed into second pipeline (42).
3. enclosed cooling tower prewarming circulating system according to claim 2, it is characterised in that the circulation line also wraps
The first pipeline (41) is included, one end of first pipeline (41) is communicated in the hot water line, and tie point is located at the hot water
Between mouth (151) and first shut-off valve (21), the other end of first pipeline (41) and second pipeline (42)
The other end is connected with the tie point of the other end of the 3rd pipeline (43)；
The 3rd shut-off valve (23) and the first check valve (31), first check valve (31) are provided with first pipeline (41)
For making the recirculated water in the first pipeline (41) flow into second pipeline (42).
4. enclosed cooling tower prewarming circulating system according to claim 3, it is characterised in that the 3rd shut-off valve
(23) it is positioned close to first pipeline (41) and at the tie point of the hot water line, first check valve (31) is set
At away from tie point of first pipeline (41) with the hot water line.
5. enclosed cooling tower prewarming circulating system according to claim 1, it is characterised in that the 4th pipeline (44)
On be additionally provided with second circulation pump (13).
A kind of 6. enclosed cooling tower prewarming circulating system according to claim 1, it is characterised in that the 4th pipeline
(44) it is not connected with one end that the hot water line is connected with collecting tank (14).
7. enclosed cooling tower prewarming circulating system according to claim 2, it is characterised in that second pipeline (42)
On be additionally provided with the 4th shut-off valve (24).
8. enclosed cooling tower prewarming circulating system according to claim 2, it is characterised in that the enclosed cooling tower
(11) the first temperature sensor is provided with, the 3rd pipeline (43) is provided with second temperature sensor.
9. enclosed cooling tower prewarming circulating system according to claim 1, it is characterised in that the enclosed cooling tower
(11) flowmeter is additionally provided with.
10. enclosed cooling tower prewarming circulating system according to claim 1, it is characterised in that the circulation line is set
It is equipped with insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721301007.2U CN207317569U (en) | 2017-10-10 | 2017-10-10 | A kind of enclosed cooling tower prewarming circulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721301007.2U CN207317569U (en) | 2017-10-10 | 2017-10-10 | A kind of enclosed cooling tower prewarming circulating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207317569U true CN207317569U (en) | 2018-05-04 |
Family
ID=62429169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721301007.2U Active CN207317569U (en) | 2017-10-10 | 2017-10-10 | A kind of enclosed cooling tower prewarming circulating system |
Country Status (1)
| Country | Link |
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| CN (1) | CN207317569U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109630856A (en) * | 2018-11-14 | 2019-04-16 | 贵州航天特种车有限责任公司 | A kind of oil equipment self-circulation lubricating cooling system |
-
2017
- 2017-10-10 CN CN201721301007.2U patent/CN207317569U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109630856A (en) * | 2018-11-14 | 2019-04-16 | 贵州航天特种车有限责任公司 | A kind of oil equipment self-circulation lubricating cooling system |
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Address after: Building No. 7, No. 289 Taji Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province, China Patentee after: Jinghe System Technology (Suzhou) Co.,Ltd. Address before: Room 3, 1288, Shipai Jinghan Road, Kunshan City, Suzhou City, Jiangsu Province Patentee before: KUNSHAN FLOWTECH ELECTRO-MECHANICAL ENGINEERING CO.,LTD. |