CN109297347B - Spray system for evaporative condenser - Google Patents
Spray system for evaporative condenser Download PDFInfo
- Publication number
- CN109297347B CN109297347B CN201811234780.0A CN201811234780A CN109297347B CN 109297347 B CN109297347 B CN 109297347B CN 201811234780 A CN201811234780 A CN 201811234780A CN 109297347 B CN109297347 B CN 109297347B
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- China
- Prior art keywords
- spray
- shower
- water
- nozzle
- pipe
- 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.)
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Links
- 239000007921 spray Substances 0.000 title claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 210000001331 nose Anatomy 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 description 17
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The utility model provides an evaporation is spraying system for condenser, including header tank, water pump, spray water tank and shower, wherein the water pump is connected between header tank and spray water tank, and the shower is connected with spray water tank, and its characterized in that, the shower comprises anterior segment shower, middle section shower and back end shower, and wherein the diameter of anterior segment shower, middle section shower and back end shower reduces in proper order, and the bottom parallel and level setting of three sections shower forms the eccentric reducing structure that the central axis reduces in proper order, and every section shower bottom is evenly spaced apart respectively and is equipped with a plurality of trompils that are used for installing the nozzle. The spray system for the evaporative condenser adopts the three-section eccentric reducing spray pipe, and different numbers of nozzles are arranged on the spray pipe to improve the flow velocity in the pipe and improve the uneven difference of the flow of the outlet of the nozzles. In addition, the filter screen can be cleaned at any time without stopping the machine by arranging the two-way filter pipeline.
Description
Technical Field
The present invention relates generally to refrigeration equipment, and more particularly to a spray system for an evaporative condenser.
Background
An evaporative condenser is a device that exchanges heat with refrigerant in a tube by forming a water film from water sprayed onto the surface of a coil. At present, a spray system of a conventional evaporative condenser consists of a plurality of spray pipes with the same diameter, but as the fluid flow rate and the fluid pressure are larger at the inlet of the spray pipes, the flow rate at the nozzle is also larger, and as the pressure is reduced along the inner edge Cheng Xieliu of the pipes and the friction in the pipes is reduced, the flow rate of the nozzle is gradually reduced, when the flow rate in the spray pipes approaches the tail end of the spray pipes, the flow rate in the spray pipes is reduced, the kinetic energy is gradually converted into static pressure, and stagnation pressure higher than the static pressure is formed, so that the flow rate of the nozzle is increased instead.
The evaporative condenser is provided with a filter screen in the water collecting tank, and is generally used for filtering impurities and sludge in the water collecting tank, so that the spray pump is prevented from being blocked, and the spray water quantity and the water quality are influenced. However, when the conventional filter screen is cleaned, the equipment needs to be stopped, so that the working states of other working procedures matched with the equipment can be directly influenced, and certain economic loss is directly caused. There is no special case where the evaporative condenser is not allowed to stop during operation. In areas with poor water quality and perennial sand blasting, high-frequency treatment of the water quality in the water collection tank is required to ensure the heat exchange effect, namely the cleaning frequency of the filter screen is increased. Under the working condition that the equipment runs for a long time, impurities, sludge and the like can be accumulated in the water collection tank, so that the equipment is required to be stopped and the filter screen can be cleaned. That is, there is a need for a filter device that can be cleaned at any time without stopping the apparatus.
Disclosure of Invention
The present invention aims to overcome one or more of the above-mentioned drawbacks of the prior art by providing a spray system (device) for an evaporative condenser.
The spray system for the evaporative condenser comprises a water collecting tank, a water pump, a spray water tank and spray pipes, wherein the water pump is connected between the water collecting tank and the spray water tank, the spray pipes are connected with the spray water tank, each spray pipe consists of a front spray pipe, a middle spray pipe and a rear spray pipe, the diameters of the front spray pipe, the middle spray pipe and the rear spray pipe are sequentially reduced, the bottoms of the three spray pipes are flush, an eccentric reducing structure with sequentially reduced central axis is formed, and a plurality of nozzle joints are respectively and uniformly arranged at intervals at the bottom of each spray pipe.
Preferably, the front section shower has the largest number of nozzle joints at the bottom, the middle section shower has the smallest number of nozzle joints at the bottom, and the rear section shower has the largest number of nozzle joints at the bottom.
Preferably, the spray pipes are arranged in parallel in multiple groups, and the nozzle joints at the bottoms of the adjacent groups of spray pipes are staggered.
Preferably, two paths of filter pipelines are arranged in the water collection tank in parallel, filter screens are respectively arranged at the water inlets of the two paths of filter pipelines, valves are respectively arranged on the two paths of filter pipelines, and water outlets of the two paths of filter pipelines are connected with the water pump through a three-way pipe.
Preferably, the filter screen is arranged at the water inlet of the filter pipeline in a sleeving manner and is fixed by a bolt.
In addition, the spray system for the evaporative condenser can further comprise a movable ball-cock assembly, and the movable ball-cock assembly is arranged in the water collecting tank and is used for conveniently and quickly adjusting water supplementing flow according to different conditions. The movable ball float valve assembly comprises a water replenishing pipe, a supporting rod and a floating ball which are sequentially connected, wherein an adjusting valve is arranged at the joint of the water replenishing pipe and the supporting rod; further comprises:
the adjusting plate is provided with three vertical parallel moving grooves which are divided into a left moving groove, a right moving groove and a middle moving groove;
the clamping plates are sleeved at the middle part of the water supplementing pipe, the adjusting plate is clamped in the middle, and corresponding bolt holes are formed in the clamping plates; a handle is arranged on any one of the pair of clamping plates;
the bolt holes on the clamping plates are opposite to the left moving groove and the right moving groove on the adjusting plate, and the water supplementing pipe passes through the middle moving groove on the adjusting plate;
the pair of clamping plates can be fixed on the adjusting plate through the bolts, when the height of the floating ball needs to be adjusted, the bolts are loosened, and the pair of clamping plates are moved up and down through the handle, so that the water supplementing pipe, the supporting rod and the floating ball are driven to move up and down.
The spray system for the evaporative condenser provided by the invention adjusts the conventional spray pipe into the three-section eccentric reducing spray pipe, and different numbers of nozzles are arranged on the spray pipe to improve the flow velocity in the pipe and improve the uneven difference of the flow of the outlets of the nozzles. In addition, the filter screen can be cleaned at any time without stopping the machine by arranging the two-way filter pipeline. And water supplementing flow in the water collecting tank can be conveniently and rapidly adjusted according to different conditions by arranging the movable ball float valve assembly.
Drawings
Fig. 1 is a schematic front view of a spray system for an evaporative condenser according to the present invention.
Fig. 2 is a schematic plan view of a spray system for an evaporative condenser according to the present invention.
Fig. 3 is a schematic view showing a mounting structure of a filter screen in the spray system for an evaporative condenser of the present invention.
Fig. 4 is a schematic view showing a mounting structure of a nozzle joint in the shower system for an evaporative condenser according to the present invention.
Fig. 5 is a schematic structural view of the nozzle adapter shown in fig. 4.
Fig. 6 is a schematic perspective view of a movable ball-cock assembly in a spray system for an evaporative condenser of the present invention.
Fig. 7 is a schematic side view of a moving float valve assembly in a spray system for an evaporative condenser of the present invention.
Fig. 8 is a schematic view of three operating states of a moving float valve assembly in a spray system for an evaporative condenser of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the spray system for an evaporative condenser according to the present invention includes a water collection tank 10, a water pump 20, a spray water tank 1, and a spray pipe. The water collection tank 10 is arranged below the spray water tank 1, wherein a water inlet of the water pump 20 is connected with the water collection tank 10, a water outlet is connected with a water inlet 21 of the spray water tank 1, and a spray pipe is connected with the spray water tank 1 to form a circulating spray system.
Referring specifically to fig. 1 and 2, the shower pipe is composed of 3 sections of shower pipes, and is divided into a front section of shower pipe 2, a middle section of shower pipe 4 and a rear section of shower pipe 6. The diameters of the three sections of spray pipes are sequentially reduced, but the bottom ends of the three sections of spray pipes are positioned on the same horizontal plane, so that an eccentric reducing structure with sequentially reduced central axes is formed. In a preferred embodiment, the three shower pipes are the same length. The bottom of each section of spray pipe is uniformly provided with a plurality of nozzle joints 8 at intervals for installing nozzles 9. The front section spray pipe 2 has the largest number of the bottom nozzle joints, the middle section spray pipe 4 has the smallest number of the bottom nozzle joints, and the rear section spray pipe 6 has the bottom nozzle joints between the two. Although the figures illustrate embodiments in which the shower is comprised of 3-stage shower pipes. However, in other embodiments, the shower pipe may be composed of 3 or more shower pipes, as long as the requirement of sequentially decreasing diameter is satisfied.
In the specific implementation process, the three sections of spray pipes can be formed by connecting three different-diameter round pipes with the same length, and holes are formed in the bottom side of the three sections of spray pipes for welding the nozzle joints 8, the nozzles 9 are arranged on the spray pipes, and the nozzles 9 are preferably ABS nozzles.
The side plate of the spray water tank 1 is provided with a hole, a layer of groove-shaped gasket is attached, the front-section spray pipe 2 is inserted into the spray water tank 1, and meanwhile, the tail end of the rear-end spray pipe 6 is provided with a pipe cap 7. In addition, the frame 3 can be used for supporting the spray pipe, in particular, the connecting rod 5 is fixed on the inner side of the frame 3 in a bolt connection mode, meanwhile, the spray pipe is sleeved by the U-shaped clamp, and the U-shaped clamp is fixed on the connecting rod 5 in a nut connection mode. In the embodiment shown in fig. 1 and 2, 4 sets of shower pipes are arranged in parallel, and the nozzle joints 8 (i.e., the nozzles 9) at the bottoms of the adjacent sets of shower pipes are staggered.
After the eccentric reducing spray pipe is arranged on the evaporative condenser, the flow velocity in the pipe can be increased through the reducing pipe, and the uniformity of flow distribution at the outlet of the nozzle can be regulated by utilizing the difference of the number of the nozzles on the length of each reducing. The flow and the flow velocity at the inlet of the spray pipe are larger, the flow passing through the outlet of each spray nozzle can be reduced by increasing the number of the spray nozzles, the flow velocity in the pipe is increased by reducing the inner diameter of the spray pipe at the middle part of the spray pipe, the outlet flow of the spray nozzle is increased by reducing the number of the spray nozzles, but the number of the spray nozzles is larger than that of the spray pipes in the middle section at the position of the spray pipe close to the tail section, and the outlet flow of the spray nozzles at the inlet of the spray pipe is far smaller than that of the spray pipes although the outlet flow of the spray nozzles is increased to some extent. Through combining eccentric reducing shower and nozzle of different quantity, can improve the homogeneity of nozzle outlet flow, strengthen the heat transfer effect.
Referring to fig. 2 specifically, two filter pipelines 11 are arranged in parallel in the water collection tank 10, the two filter pipelines 11 have basically the same structure, the water inlets are respectively provided with a filter screen 13, the middle parts are respectively provided with a valve 12, and the water outlets of the two filter pipelines 11 are connected with a water pump 20 through a three-way pipe 15. Referring to fig. 3 specifically, a filter screen 13 is sleeved at the water inlet of the filter pipeline 11 in a sleeve mode and is fixed by a bolt 14. After the filter device is arranged on the evaporative condenser, when the filter screen needs to be cleaned, the valve on the corresponding pipeline is closed, the filter screen sleeve is drawn out, and meanwhile, the valve on the other side of the pipeline is opened. Through adjusting the pipeline valve, the filter screen can be cleaned at any time without stopping operation, the requirement of water quality in the water collecting tank is improved, and meanwhile, the water quantity requirement during the operation without stopping operation is ensured.
The present invention also provides a nozzle switching structure capable of adjusting the spray angle of the nozzle, referring to fig. 4 to 5, which includes a pair of connection noses 51, a steering seat 52, and a hose 56. A pair of connecting noses 51 are welded on both sides of the nozzle joint 8, and a steering seat 52 is provided between the two connecting noses 51 and is screwed with a base 54 of the steering seat 52 by a bolt 55 passing through a hole on either connecting noses 51. The steering seat 52 has a through hole 53, the through hole 53 is opposite to the nozzle joint 8, one end of a hose 56 passes through the through hole 53 in the middle of the steering seat 52 and is sleeved on the nozzle joint 8, and the other end of the hose 56 is used for connecting the nozzle 9. When the spray angle of the nozzle 9 needs to be adjusted, the bolt 55 is unscrewed, so that the steering seat 52 can rotate up and down between the two connecting noses 51, the hose 56 can rotate up and down, the spray angle of the nozzle 9 can be adjusted, and the bolt 55 is screwed after the spray angle is adjusted in the same direction. The spray nozzle with the adjustable spray angle can enable the spray system of the invention to be conveniently adjusted when being applicable to different coil structures.
At present, in the operation process of a conventional evaporative condenser, automatic water supplementing is carried out by means of a float valve in a water collecting tank, but the automatic water supplementing flow is small, so that the float valve is always in a water supplementing state, and excessive water supplementing amount overflows from a water tray when equipment is stopped, so that great waste of water resources is caused.
The present invention provides a movable ball-cock assembly in the header tank 10 of a spray system for an evaporative condenser. Referring to fig. 6-7, the movable ball float valve assembly mainly comprises a water supplementing pipe 30, a supporting rod 38 and a floating ball 41 which are connected in sequence, wherein an adjusting valve (not shown in the figure) is arranged at the joint of the water supplementing pipe 30 and the supporting rod 38; the opening degree of the regulating valve is regulated by the movement of the floating ball 41 on the liquid surface, so as to control the water supplementing liquid level, and the regulating valve is a common component in the prior art, and the specific structure of the regulating valve is not discussed in detail here.
An adjusting plate 36 and a pair of clamping plates 34 are provided in the middle of the water replenishment pipe 30. Wherein, three rectangular moving grooves which are vertically parallel are arranged on the adjusting plate 36 and are divided into a left moving groove 44, a right moving groove 44 and a middle moving groove 45; the width of the left and right moving grooves 44 is the same, and the width of the intermediate moving groove 45 is larger than the width of the left and right moving grooves. A pair of clamping plates 34 are sleeved and fixed (for example, welded) at the middle part of the water supplementing pipe 30, and clamp the adjusting plate 36 in the middle, and corresponding bolt holes are formed on the clamping plates 34; a handle 35 is provided on either of the pair of clamping plates 34.
Wherein the bolt holes on the pair of clamping plates 34 are opposite to the left and right moving grooves 44 on the adjusting plate 36, and the water replenishing pipe 30 passes through the middle moving groove 45 on the adjusting plate 36. The left clamping plate 47 and the right clamping plate 48 can be fixed to the adjusting plate 36 by bolts 46.
In addition, the movable ball float valve assembly further comprises a support rod limiting plate 39, a vertical limiting groove 40 is formed in the support rod limiting plate 39, and the support rod 38 penetrates through the limiting groove 40. So that the support bar 38 moves up and down only along the limit groove 40.
When in installation, the water inlet end of the water supplementing pipe 30 is connected with the water inlet joint 23 of the water inlet 22 of the water collecting tank 10 through the stainless steel corrugated hose 31; both the adjusting plate 36 and the support bar limiting plate 39 are fixed to the inner wall of the header tank 10.
Referring to fig. 8, when the height of the floating ball 41 is required to be adjusted, the bolt 46 is loosened, and the pair of clamping plates 34 is moved up and down by the handle 35, so that the water replenishing pipe 30, the supporting rod 38 and the floating ball 41 are driven to move up and down, and the water replenishing amount is adjusted. When the water supplementing quantity is large, the pair of clamping plates 34 can be moved upwards to drive the supporting rods 38, so that the floating balls 41 can be moved downwards, and the water supplementing quantity is greatly increased. When the water replenishing flow is reduced, the pair of clamping plates 34 can be moved downwards to enable the floating ball to move upwards, the water replenishing flow is reduced until the water replenishing is finished, and water overflow during equipment shutdown is avoided. The requirements of adjusting the water supplementing flow can be met by moving a pair of clamping plates to be combined with the floating ball and the supporting rod.
It will be appreciated by persons skilled in the art that the foregoing description and examples have been provided merely to illustrate the invention and are not intended to be limiting thereof.
Claims (3)
1. The spray system for the evaporative condenser comprises a water collecting tank, a water pump, a spray water tank and a spray pipe, wherein the water pump is connected between the water collecting tank and the spray water tank, and the spray pipe is connected with the spray water tank;
the number of the front-section spray pipe bottom nozzle joints is the largest, the number of the middle-section spray pipe bottom nozzle joints is the smallest, and the number of the rear-section spray pipe bottom nozzle joints is between the two;
wherein the spray pipes are arranged in parallel in a plurality of groups, and the nozzle joints at the bottoms of the adjacent groups of spray pipes are arranged in a staggered manner;
also comprises a nozzle switching structure capable of adjusting the injection angle of the nozzle, the nozzle switching structure comprises a pair of connecting noses, a steering seat and a hose; a pair of connecting noses are welded on two sides of the nozzle joint, the steering seat is arranged between the two connecting noses, and the steering seat is in threaded connection with the base of the steering seat through a hole on any connecting nose by a bolt; the steering seat is provided with a through hole, the through hole is opposite to the nozzle joint, one end of the hose penetrates through the through hole in the middle of the steering seat and is sleeved on the nozzle joint, and the other end of the hose is used for connecting the nozzle.
2. The spray system for an evaporative condenser according to claim 1, wherein two paths of filter pipelines are arranged in parallel in the water collecting tank, the water inlets of the two paths of filter pipelines are respectively provided with a filter screen, the two paths of filter pipelines are respectively provided with a valve, and the water outlets of the two paths of filter pipelines are connected with the water pump through a three-way pipe.
3. The spray system for an evaporative condenser, as recited in claim 2, wherein the filter screen is installed at the water inlet of the filter line by means of a socket joint and is fixed by means of a plug pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811234780.0A CN109297347B (en) | 2018-10-23 | 2018-10-23 | Spray system for evaporative condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811234780.0A CN109297347B (en) | 2018-10-23 | 2018-10-23 | Spray system for evaporative condenser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109297347A CN109297347A (en) | 2019-02-01 |
| CN109297347B true CN109297347B (en) | 2023-11-24 |
Family
ID=65157589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811234780.0A Active CN109297347B (en) | 2018-10-23 | 2018-10-23 | Spray system for evaporative condenser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109297347B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066756A (en) * | 2019-06-10 | 2020-12-11 | 宁夏金圆化工有限公司 | Deep cooling device based on large-pot method for producing flake caustic soda |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202562329U (en) * | 2012-05-22 | 2012-11-28 | 北京京诚科林环保科技有限公司 | Evaporative heat exchanger |
| CN203235407U (en) * | 2013-02-07 | 2013-10-16 | 中国神华能源股份有限公司 | Slurry spraying device and installation structure thereof |
| CN204429081U (en) * | 2015-01-19 | 2015-07-01 | 大连海顺重工环保设备有限公司 | Desulfurization spray equipment |
| CN205146511U (en) * | 2015-11-25 | 2016-04-13 | 涿州市朗博科机械制造有限公司 | Spraying system with external filter |
| CN206185108U (en) * | 2016-08-31 | 2017-05-24 | 中冶赛迪工程技术股份有限公司 | Square billet secondary cooling spray set |
| CN207221679U (en) * | 2017-08-30 | 2018-04-13 | 沈阳怡森环保科技有限公司 | A kind of high-efficiency low-resistance spray equipment |
| CN207935604U (en) * | 2018-03-21 | 2018-10-02 | 邯郸宏大化纤机械有限公司 | Filature exhaust pipeline structure |
-
2018
- 2018-10-23 CN CN201811234780.0A patent/CN109297347B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202562329U (en) * | 2012-05-22 | 2012-11-28 | 北京京诚科林环保科技有限公司 | Evaporative heat exchanger |
| CN203235407U (en) * | 2013-02-07 | 2013-10-16 | 中国神华能源股份有限公司 | Slurry spraying device and installation structure thereof |
| CN204429081U (en) * | 2015-01-19 | 2015-07-01 | 大连海顺重工环保设备有限公司 | Desulfurization spray equipment |
| CN205146511U (en) * | 2015-11-25 | 2016-04-13 | 涿州市朗博科机械制造有限公司 | Spraying system with external filter |
| CN206185108U (en) * | 2016-08-31 | 2017-05-24 | 中冶赛迪工程技术股份有限公司 | Square billet secondary cooling spray set |
| CN207221679U (en) * | 2017-08-30 | 2018-04-13 | 沈阳怡森环保科技有限公司 | A kind of high-efficiency low-resistance spray equipment |
| CN207935604U (en) * | 2018-03-21 | 2018-10-02 | 邯郸宏大化纤机械有限公司 | Filature exhaust pipeline structure |
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| Publication number | Publication date |
|---|---|
| CN109297347A (en) | 2019-02-01 |
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Address after: No.458, Gongye Road, Baoshan District, Shanghai 200444 Applicant after: Shanghai Baofeng Machinery Manufacturing Co.,Ltd. Address before: No.458, Gongye Road, Baoshan District, Shanghai 200444 Applicant before: SHANGHAI BAOFENG MACHINERY MANUFACTURING Co.,Ltd. |
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