Relatively developed countries, the gear pump industry in China started late, but people pointed out that gear pumps in our country, you can advise construction professionals to connect the basement of high-rise residential .It is possible to use the advantages of backward development to achieve leaps and bounds.
In the water pump industry, there are many examples of products that realize technological leaps and bounds, such as the double-shell high pressure boiler feed pump of Shanghai Pump Factory, the slurry pump of Shijiazhuang Pump Factory, the screw pump of Tianjin Pump Machinery Group Co., Ltd., etc. These Products from the technical level speaking with the international level close to some companies use foreign advanced technology to transform their own products in order to achieve technological leaps.Such as Shenyang Pump Factory to use advanced foreign technology to improve AY-type pump rotor stiffness, anti-bite material Of the application has been leaps and bounds; AY-type pump to replace the Y-pump to occupy most of the domestic pump market.In the field of high-tech industries, as long as technically even a small step ahead, it is possible to occupy this large Part of the market.Therefore, 20 years of reform and opening up, China's pump industry has achieved technological leaps and bounds, but also only by implementing technology by leaps and bounds, in order to continue to narrow the gap with developed countries, to catch up with or exceed the advanced level abroad.
In a multi-building plot, it is uneconomical to invest a large amount of investment in each building with pump rooms, and the maintenance and management of the equipment requires a lot of manpower and material resources. , Generally consider setting centralized pump room, centralized pump room settings can refer to the Shanghai "Civil Building Water Fire Extinguishing System Design Code" (DGJ08-94-2001) Article 6.5.3 of the relevant provisions: gear pump water supply services Radius should not be greater than 150m, pump room water pressure should not normally be greater than 0.45MPa. In the actual design, should be based on the different circumstances of each plots flexible use.
(1) For example, a factory area plots, the red line within the scope of a number of multi-storey plant, multi-storey dormitory, multi-storey office building .In this case the centralized pump room is more economical, to meet the water supply service radius of not more than 150m Under the premise, a centralized pump house can be set up in the proper position of the load center in the plant area, which is more reasonable due to the fact that the plant area generally covers a large area.
(2) For example, a multi-storey or small high-rise residential district may set up one or more centralized pumping houses according to the different development periods of developers and the height of the storey and the size of the storage tanks. Due to the large number of residential quarters , So the water pump room storage pond covers a relatively large area for a residential quarters, the centralized pump room is located in the commercial and residential buildings in the lower or underground garage than in the building outside the single set of gear Oil pump room is more economical.Shanghai "Residential Design Standards" (DGJ08-20-2001) Article 1, Article No. 0.0.19 stipulates: There should be no sewage pipes inside the pump house. "Secondary water supply facilities hygiene specification" (GBl7051- 1997) Article 5.5 stipulates that there shall be no seepage pits and piles of trash and other pollutants within 10m around the reservoir, there shall be no sewage pipelines and pollutants within 2m around the water tank, and the centralized pump room in the basement may be under these conditions The effective area used is quite limited.Generally speaking, it is more reasonable to set centralized pumping station in the underground garage because the garage has large columnar spacing, less shear wall, less sewage pipeline around the pump house and available pump room area Big.
(3) For example, in a high-rise residential area, if the basement of an adjacent building is not connected, it is not suitable to set centralized pumping house because the pressure of outlet water in high-rise residential pumping house is generally greater than 0.45MPa; , The overall impact on the overall pipeline district, but also a wide range of use of trench, but also greatly reduce the quality of the district. Concentrated gear pump pipe buried in the casing, is not conducive to the maintenance and maintenance of the pipeline. Take Shanghai For example, the ownership of water supply pipelines in residential buildings belongs to developers and water supply pipelines outside residential areas. Ownership belongs to the water company. Based on the accumulated experience of many years of operation, the water company has set its own industry standard for the setting of overall pipelines. Therefore, If the basement is not connected, it is not advisable to set up a centralized pump house. If the basement of an adjacent building is connected, a centralized pump house can be set up because the pump pipe is taken inside the house and the internal maintenance and maintenance of the house Much easier, and has no effect on the overall district pipeline integration, so if the high-rise residential areas to be set

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Pvc Injection

During the injection molding process, when the molten plastic meets in the form of multiple strands in the cavity due to the holes in the insert, the areas where the flow rate is discontinuous, and the area where the filling material flow is interrupted, a linear weld seam is produced because it cannot be completely fused. In addition, when the gate injection molding occurs, a weld seam will also be formed, and the strength and other properties of the weld seam are poor. The main reasons are as follows:
Processing:
The injection pressure and speed are too low, and the barrel temperature and mold temperature are too low, resulting in premature cooling of the molten material entering the mold and the appearance of weld seams.
When the injection pressure and speed are too high, injection will occur and weld seams will appear. The speed should be increased, and the back pressure should be increased to reduce the viscosity of the plastic and increase the density. Plastics should be dry well, recycled materials should be used sparingly, and weld seams may occur if the amount of release agent is too much or the quality is not good. Reduce clamping force and facilitate exhaust.
2. Mould:
If there are too many gates in the same cavity, reduce the gate or set it symmetrically, or set it as close as possible to the weld seam. The exhaust at the weld seam is poor, and an exhaust system should be set up. The sprue is too large, the size of the gating system is improper, and the gate is opened to prevent the melt from flowing around the insert hole, or use as few inserts as possible. If the wall thickness changes too much, or the wall thickness is too thin, the wall thickness of the workpiece should be uniform. If necessary, a fusion well should be opened at the fusion seam to separate the fusion seam from the workpiece.
3. Plastic aspects:
Lubricants and stabilizers should be appropriately added to plastics with poor fluidity or heat sensitivity. Plastic contains a lot of impurities, if necessary, replace the plastic with good quality.

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