CN108387134A - Tube heat exchanger equipment tube-bundle cleaning device - Google Patents
Tube heat exchanger equipment tube-bundle cleaning device Download PDFInfo
- Publication number
- CN108387134A CN108387134A CN201810142436.2A CN201810142436A CN108387134A CN 108387134 A CN108387134 A CN 108387134A CN 201810142436 A CN201810142436 A CN 201810142436A CN 108387134 A CN108387134 A CN 108387134A
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- Prior art keywords
- cylindrical
- transmission gear
- rotating shaft
- cylindrical disk
- tube
- 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.)
- Pending
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 63
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 230000007423 decrease Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011086 high cleaning Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G3/00—Rotary appliances
- F28G3/16—Rotary appliances using jets of fluid for removing debris
- F28G3/163—Rotary appliances using jets of fluid for removing debris from internal surfaces of heat exchange conduits
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning In General (AREA)
Abstract
The present invention provides a kind of tube heat exchanger equipment tube-bundle cleaning device, includes the driving device of two rotary shafts disposed in parallel and sealing；Cylinder plate group is welded in two rotary shafts, the cylinder plate alternate intervals setting in cylinder plate group, and the diameter of the cylinder plate in cylinder plate group is less than the diameter of tube heat exchanger equipment tube bank, the surface of each cylinder plate in cylinder plate group carries asperities；Driving device includes motor, the first transmission gear and the second transmission gear, the output shaft of motor passes through shaft coupling and the first rotary shaft or the second rotation axis connection, first transmission gear is set in the first rotary shaft, second transmission gear is set in the second rotary shaft, and the first transmission gear is meshed with the second transmission gear.Using the present invention, heat exchange efficiency not only ensure that, can also avoid chemical cleaning or extend the chemical cleaning period, avoid chemical cleaning to leakage detection plugging operation after corrosion of metal and cleaning.
Description
Technical Field
The invention belongs to the technical field of tube bundle cleaning, and particularly relates to a device suitable for physically cleaning a tube bundle of an enhanced tube type heat exchange device.
Background
Tube bundle heat exchange equipment such as a condenser, a heater and the like is important equipment for cogeneration enterprises, thermal power, petroleum, chemical industry and other industrial enterprises, is mainly used for heat exchange among different media, and can generate deposits such as scales, corrosion products, slime and the like in a heater tube (on the side of a cooling medium) due to factors such as high heat load, high quality of the cooling medium, leakage and the like. The sediment not only enables the heat exchange effect to be greatly reduced and the drainage temperature to be increased, so that the economical efficiency is greatly reduced, the operation parameters of the equipment cannot meet the technical requirements of the process, but also can additionally give great stress to the heat exchange tube, aggravate the corrosion of the heat exchange tube bundle, shorten the service life of the equipment and pollute the cooled medium. According to statistics, the heat exchange tube of the condenser of the 300MW unit has the scaling thickness of 0.5mm, the heat efficiency of the unit is reduced by 1.2%, the scaling thickness is 1mm, and the heat efficiency of the unit is reduced by 3.3%. Therefore, it is important to prevent and remove the deposits from the heat exchange devices such as the condenser and the heater.
In the aspect of preventing the deposits, although the guidelines such as (DL/T300-plus 2011) thermal power plant condenser pipe anticorrosion and antiscale guidelines have clear requirements, due to factors such as large water quality difference of a water source and unqualified effluent of treatment process equipment, the phenomena of dirt blockage, perforation and the like of thermal exchange equipment such as a condenser are still common phenomena, and even after the pipe blockage exceeds 10%, the heat exchange effect of system equipment cannot meet the requirements and the heat exchanger is directly replaced, the phenomena occur.
Cleaning of the heat exchanger includes physical cleaning and chemical cleaning. The guiding rule in chemical cleaning, such as (DL T957-: 1) poor operability, long implementation cycle (planning, approval, bidding, implementation, inspection); 2) the tube bundle is corroded to a certain degree, and particularly, the tube bundle with serious pitting corrosion mostly leaks after being cleaned, so the leaked or leaked tube bundle is generally required to be replaced after being cleaned; 3) poor economy, high cost, and the need to treat a large amount of extra waste liquid; 4) the occupational health conditions are poor, and a certain amount of acid gas is generated when hydrochloric acid, nitric acid and the like are cleaned, so that equipment and human bodies are seriously harmed; 5) the cleaning effect of the large sectional area part of the corrugated pipe is ensured, and the corrosion amount of the other small sectional area parts is larger. The physical cleaning mode mainly comprises two modes of flushing by a high-pressure water gun, cleaning by a rubber ball and the high-pressure water gun, and the two cleaning modes have the following defects: 1) hard sediments cannot be effectively removed, and the method is mainly used for removing sludge and soft sediments; 2) the extra additional stress is added to the tube bundle, so that the tube bundle is damaged to a certain extent; 3) the construction period is long, the workload is large, the effect is poor, the efficiency is low, and the environment is severe. 4) The cleaning effect on the corrugated pipe bundle is poor.
The equipment has certain requirements on service life and cleaning times, chemical cleaning can be implemented only after the cleaning requirements are met, the deposition rule of the deposits is that the relationship of unit area deposition quantity along with the time extension is not a linear relationship, but a logarithmic relationship, in addition, the deposits can be gradually changed into hard scales along with the time extension and the reduction of heat exchange efficiency, and the difficulty of physical cleaning can be increased.
Therefore, there is a need for a physical cleaning device to improve the efficiency and effectiveness of physical cleaning.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a tube bundle cleaning device of a tube type heat exchange device, which aims to solve the problems in the prior art.
The invention provides a tube bundle cleaning device of a tube type heat exchange device, which comprises: a first rotating shaft, a second rotating shaft and a sealed driving device; the first rotating shaft is welded with a first cylindrical disc set and a second cylindrical disc set, and each cylindrical disc in the first cylindrical disc set has the same diameter smaller than the tube bundle of the tubular heat exchange equipment; the diameter of each cylindrical plate in the second cylindrical plate group is smaller than that of the tube bundle of the tubular heat exchange equipment, and the diameter of each cylindrical plate is gradually reduced according to the cleaning direction; a third cylindrical disk set and a fourth cylindrical disk set are welded on the second rotating shaft, and each cylindrical disk in the third cylindrical disk set has the same diameter smaller than the tube bundle of the tubular heat exchange equipment; the diameter of each cylindrical plate in the fourth cylindrical plate group is smaller than that of the tube bundle of the tube type heat exchange equipment, and the diameter of each cylindrical plate is gradually reduced according to the cleaning direction; the cylindrical disks in the first cylindrical disk group and the cylindrical disks in the third cylindrical disk group are alternately arranged at intervals, and the cylindrical disks in the second cylindrical disk group and the cylindrical disks in the fourth cylindrical disk group are alternately arranged at intervals; the surface of each cylindrical disk in the first cylindrical disk group, the second cylindrical disk group, the third cylindrical disk group and the fourth cylindrical disk group is provided with concave-convex grains; the driving device comprises a motor, a first transmission gear and a second transmission gear, an output shaft of the motor is connected with a first rotating shaft or a second rotating shaft through a coupler, the first transmission gear is sleeved on the first rotating shaft, the second transmission gear is sleeved on the second rotating shaft, and the first transmission gear is meshed with the second transmission gear.
The tube bundle cleaning device for the tubular heat exchange equipment can achieve the following technical effects:
1. because the concave-convex grains which are densely arranged and the repeated turning rotation of different parts, the device has high cleaning efficiency, and simultaneously greatly reduces the difficulty and the workload of material cleaning, usually, after each pipe is adopted twice at most, the residual scale amount is reduced to below 2 percent of the maximum initial scale amount, the descaling performance is excellent, the quality requirement of conventional pipe bundle cleaning is exceeded, and the conventional descaling means of physical cleaning and chemical cleaning is avoided.
2. The device has good automatic function and high safety factor, a single device can be repeatedly used for more than 1000 times, and no adverse effect and damage are caused to the inner wall of the tube bundle.
3. The device provides a high-efficiency, safe, feasible and economic cleaning way for cleaning hard scales of the tube bundle, not only ensures the heat exchange efficiency, but also can avoid chemical cleaning or prolong the chemical cleaning period, and avoid the corrosion of the chemical cleaning to metals and the work of checking leakage and plugging after cleaning.
Drawings
The invention is further described with reference to the following figures and detailed description:
FIG. 1 is a schematic structural diagram of a tube bundle cleaning device of a tube heat exchange device provided by the invention.
In the figure: the device comprises a first rotating shaft 1, a second rotating shaft 2, a driving device 3, a motor 3-1, a power supply charging port 3-1-1, a first transmission gear 3-2, a second transmission gear 3-3, a first cylindrical disc set 4, a second cylindrical disc set 5, a third cylindrical disc set 6 and a fourth cylindrical disc set 7.
Detailed Description
FIG. 1 shows the structure of a tube bundle cleaning device of a tube heat exchange device provided by the invention.
As shown in FIG. 1, the tube bundle cleaning device of the tube type heat exchange equipment comprises: the device comprises a first rotating shaft 1, a second rotating shaft 2 and a sealed driving device 3, wherein the first rotating shaft 1 and the second rotating shaft 2 are arranged in parallel, the distance between the first rotating shaft 1 and the second rotating shaft 2 is 4mm, a first cylindrical disc group 4 and a second cylindrical disc group 5 are welded on the first rotating shaft 1 along the cleaning direction of a tube bundle, each cylindrical disc in the first cylindrical disc group 4 has the same diameter, and the diameter is smaller than that of the tube bundle of the tubular heat exchange equipment, and specifically, the diameter of each cylindrical disc in the first cylindrical disc group 4 is 0.3mm smaller than that of the tube bundle of the tubular heat exchange equipment; the diameter of each cylindrical disk in the second cylindrical disk group 5 is smaller than that of the tube bundle of the tube type heat exchange equipment, and the diameter of each cylindrical disk gradually decreases according to the cleaning direction of the tube bundle; specifically, the diameter of the first cylindrical disk in the second cylindrical disk group 5 in the cleaning direction is 2mm smaller than that of the cylindrical disk in the first cylindrical disk group 4, the diameter of the second cylindrical disk in the second cylindrical disk group 5 in the cleaning direction is 2mm smaller than that of the first cylindrical disk, and so on, to obtain the diameters of all the cylindrical disks in the second cylindrical disk group 5.
A third cylindrical disk group 6 and a fourth cylindrical disk group 7 are welded on the second rotating shaft 2, each cylindrical disk in the third cylindrical disk group 6 has the same diameter, and the diameter is smaller than that of the tube bundle of the tubular heat exchange equipment, and specifically, the diameter of the cylindrical disk in the third cylindrical disk group 6 is 0.3mm smaller than that of the tube bundle of the tubular heat exchange equipment; the diameter of each cylindrical disk in the fourth cylindrical disk group 7 is smaller than that of the tube bundle of the tubular heat exchange equipment and gradually decreases according to the cleaning direction, specifically, the diameter of a first cylindrical disk in the fourth cylindrical disk group 7 according to the cleaning direction is 2mm smaller than that of a cylindrical disk in the third cylindrical disk group 6, the diameter of a second cylindrical disk in the fourth cylindrical disk group 7 according to the cleaning direction is 2mm smaller than that of the first cylindrical disk, and so on, and the diameters of all the cylindrical disks in the fourth cylindrical disk group 7 are obtained; as can be seen from fig. 1, the overall shape of the fourth cylindrical disc pack 7 resembles a cone.
The cylindrical disks in the first cylindrical disk group 4 and the cylindrical disks in the third cylindrical disk group 6 are alternately arranged at intervals, and the cylindrical disks in the second cylindrical disk group 5 and the cylindrical disks in the fourth cylindrical disk group 7 are alternately arranged at intervals; i.e. there is a distance between two adjacent cylindrical discs, preferably a distance of 1 mm.
The surface of each cylindrical disc in the first cylindrical disc group 4, the second cylindrical disc group 5, the third cylindrical disc group 6 and the fourth cylindrical disc group 7 is provided with at least one concave-convex line, and the distance between the concave-convex lines is 0.2-0.5 mm.
The driving device 3 comprises a motor 3-1, a first transmission gear 3-2 and a second transmission gear 3-3, an output shaft of the motor 3-1 is connected with the first rotating shaft 1 or the second rotating shaft 2 through a coupling, in fig. 1, an output shaft of a motor 3-1 is connected with a first rotating shaft 1, a first transmission gear 3-2 is sleeved on the first rotating shaft 1, a second transmission gear 3-3 is sleeved on the second rotating shaft 2, the first transmission gear 3-2 is meshed with the second transmission gear 3-3, when the motor 3-1 is started, the first rotating shaft 1 is driven to rotate, the first transmission gear 3-2 is meshed with the second transmission gear 3-3 for transmission, the second rotating shaft 2 is driven to rotate, thereby realize the rotation of cylinder dish, through the dirt class of the unsmooth line clearance tube bank that cylinder dish surface set up.
The first transmission gear 3-2 is meshed with the second transmission gear 3-3 for transmission, so that the first rotating shaft 1 is always opposite to the second rotating shaft 2 in rotation direction, the dirt removing capability is ensured, and the cylindrical disc is prevented from being blocked.
In order to realize the charging function of the motor 3-1, the motor 3-1 has a power charging port 3-1-1 for charging the motor 3-1.
The power source of the pipe type heat exchange equipment pipe bundle cleaning device provided by the invention is pressure water, the pipe type heat exchange equipment pipe bundle cleaning device is pushed by the pressure water to move forwards in the pipe bundle, in order to detect the pressure of the pressure water, the pressure sensors are arranged on the periphery of the outer part of the driving device 3, when the detected pressure is as high as 0.25MPa, the motor is powered off, and the pipe type heat exchange equipment pipe bundle cleaning device automatically stops rotating; when the tube type heat exchange equipment tube bundle cleaning device moves to the tail end of the tube bundle, and the pressure sensor cannot detect pressure, the tube type heat exchange equipment tube bundle cleaning device automatically stops rotating and falls into a filter screen arranged at the bottom of the heat exchange equipment along with water flow.
In order to enable the pressure water to better push the tube type heat exchange equipment tube bundle cleaning device to advance and rotate in the tube bundle, a rotating thread is arranged on the outer wall of the end part of the driving device 3.
The first rotating shaft 1, the second rotating shaft 2 and the cylindrical disc in the tube type heat exchange equipment tube bundle cleaning device are all made of light high-strength steel, the rotating speeds of the first rotating shaft 1 and the second rotating shaft 2 can be adjusted (20-40 r/min), the rotating speeds of the first rotating shaft 1 and the second rotating shaft 2 can be the same or different, and the tube type heat exchange equipment tube bundle cleaning device is low in rotating speed and cannot generate scars on a heat exchange tube because the weight of the tube type heat exchange equipment tube bundle cleaning device is only 290 g.
Claims (3)
1. The utility model provides a tubular heat exchange equipment tube bank cleaning device which characterized in that includes: a first rotating shaft (1), a second rotating shaft (2) and a sealed driving device (3), wherein the first rotating shaft (1) and the second rotating shaft (2) are arranged in parallel; wherein,
a first cylindrical disk set (4) and a second cylindrical disk set (5) are welded on the first rotating shaft (1), and each cylindrical disk in the first cylindrical disk set (4) has the same diameter smaller than the tube bundle of the tubular heat exchange equipment; the diameter of each cylindrical plate in the second cylindrical plate group (5) is smaller than that of the tube bundle of the tubular heat exchange equipment, and the diameter of each cylindrical plate gradually decreases along the cleaning direction;
a third cylindrical disk set (6) and a fourth cylindrical disk set (7) are welded on the second rotating shaft (2), and each cylindrical disk in the third cylindrical disk set (6) has the same diameter smaller than the tube bundle of the tubular heat exchange equipment; the diameter of each cylindrical plate in the fourth cylindrical plate group (7) is smaller than that of the tube bundle of the tube type heat exchange equipment, and the diameter of each cylindrical plate gradually decreases along the cleaning direction;
the cylindrical disks in the first cylindrical disk group (4) and the cylindrical disks in the third cylindrical disk group (6) are alternately arranged at intervals, and the cylindrical disks in the second cylindrical disk group (5) and the cylindrical disks in the fourth cylindrical disk group (7) are alternately arranged at intervals;
the surface of each of the first cylindrical disk group (4), the second cylindrical disk group (5), the third cylindrical disk group (6) and the fourth cylindrical disk group (7) is provided with concave-convex grains;
the driving device (3) comprises a motor (3-1), a first transmission gear (3-2) and a second transmission gear (3-3), an output shaft of the motor (3-1) is connected with the first rotating shaft (1) or the second rotating shaft (2) through a coupler, the first transmission gear (3-2) is sleeved on the first rotating shaft (1), the second transmission gear (3-3) is sleeved on the second rotating shaft (2), and the first transmission gear (3-2) is meshed with the second transmission gear (3-3).
2. The tube heat exchanger tube bundle cleaning device according to claim 1, characterized in that a pressure sensor is installed outside the driving device (3).
3. The tube heat exchanger tube bundle cleaning device according to claim 1, characterized in that a rotating thread is provided on the outer wall of the end of the driving device (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810142436.2A CN108387134A (en) | 2018-02-11 | 2018-02-11 | Tube heat exchanger equipment tube-bundle cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810142436.2A CN108387134A (en) | 2018-02-11 | 2018-02-11 | Tube heat exchanger equipment tube-bundle cleaning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108387134A true CN108387134A (en) | 2018-08-10 |
Family
ID=63068827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810142436.2A Pending CN108387134A (en) | 2018-02-11 | 2018-02-11 | Tube heat exchanger equipment tube-bundle cleaning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108387134A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883071A (en) * | 2019-04-23 | 2019-06-14 | 杭州乐守科技有限公司 | A kind of cleaning plant of solar energy vacuum tube |
| CN112304153A (en) * | 2020-11-02 | 2021-02-02 | 南京三方化工设备监理有限公司 | Movable head of device for cleaning, derusting and degreasing inner wall of heat exchange tube in heat exchanger |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4133871A1 (en) * | 1991-10-12 | 1993-04-15 | Diga Die Gasheizung Gmbh | METHOD AND DEVICE FOR REMOVING IMPURITIES FROM THE INTERNAL WALL OF A PIPELINE |
| DE10106847A1 (en) * | 2001-02-14 | 2002-09-05 | Juergen Von Der Ohe | Internal surface cleaning process involves use of rotating device with flexible central axis and shaped surface in cold air flow to clean off layers made brittle by cold |
| CN202204372U (en) * | 2011-07-15 | 2012-04-25 | 北京唯道科技发展有限公司 | Self-cleaning descaling heat exchange device for condenser |
| CN204286208U (en) * | 2014-11-20 | 2015-04-22 | 天门市诚鑫化工有限公司 | A kind of shell and tube reboiler cleaning device |
| CN104729150A (en) * | 2015-04-09 | 2015-06-24 | 哈尔滨工业大学 | Ejection type sewage shell and tube heat exchanger with multi-tube-bundle eddy flow tubes |
| KR101774768B1 (en) * | 2017-04-11 | 2017-09-05 | 한국플랜트서비스주식회사 | Particle removing apparatus to the inner of boiler tube |
-
2018
- 2018-02-11 CN CN201810142436.2A patent/CN108387134A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4133871A1 (en) * | 1991-10-12 | 1993-04-15 | Diga Die Gasheizung Gmbh | METHOD AND DEVICE FOR REMOVING IMPURITIES FROM THE INTERNAL WALL OF A PIPELINE |
| DE10106847A1 (en) * | 2001-02-14 | 2002-09-05 | Juergen Von Der Ohe | Internal surface cleaning process involves use of rotating device with flexible central axis and shaped surface in cold air flow to clean off layers made brittle by cold |
| CN202204372U (en) * | 2011-07-15 | 2012-04-25 | 北京唯道科技发展有限公司 | Self-cleaning descaling heat exchange device for condenser |
| CN204286208U (en) * | 2014-11-20 | 2015-04-22 | 天门市诚鑫化工有限公司 | A kind of shell and tube reboiler cleaning device |
| CN104729150A (en) * | 2015-04-09 | 2015-06-24 | 哈尔滨工业大学 | Ejection type sewage shell and tube heat exchanger with multi-tube-bundle eddy flow tubes |
| KR101774768B1 (en) * | 2017-04-11 | 2017-09-05 | 한국플랜트서비스주식회사 | Particle removing apparatus to the inner of boiler tube |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883071A (en) * | 2019-04-23 | 2019-06-14 | 杭州乐守科技有限公司 | A kind of cleaning plant of solar energy vacuum tube |
| CN109883071B (en) * | 2019-04-23 | 2020-09-08 | 杭州乐守科技有限公司 | Cleaning device for solar vacuum tube |
| CN112304153A (en) * | 2020-11-02 | 2021-02-02 | 南京三方化工设备监理有限公司 | Movable head of device for cleaning, derusting and degreasing inner wall of heat exchange tube in heat exchanger |
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Application publication date: 20180810 |