Technical Data_News_Dalian Xincheng Pump Industry Co., Ltd.

Cryogenic Refrigeration System Circulation Pump Selection Guide

When choosing a circulating pump for a low-temperature refrigeration system, you need to pay attention to the following three points: ①The temperature difference of the circulating pump of the low temperature refrigeration system is 5 degrees (20 degrees down to 15 degrees). The standard flow rate of the low temperature refrigeration system circulating pump is 0.5 cubic meters per hour, then you are using the pump. When using a low temperature refrigeration system circulating pump, you can't just look at the flow low temperature refrigeration system circulating pump, what temperature do you need? If your trial temperature is lowered from 58°C to 7°C, if the temperature difference is large, the hourly chilled water flow will be reduced from 3.5 cubic meters to over 1 cubic meter. If a low temperature refrigeration system circulation pump with a flow rate of 3.5 cubic meters per hour is required, a larger model should be selected. Cryogenic Refrigeration System Circulation Pump Selection Guide ②When trying to use a low temperature refrigeration system circulating pump, it depends on whether you are cooling directly or indirectly. Direct cooling is to put the water directly into the low temperature refrigeration system circulating pump, the chilled water will be directly cooled in the product you need. The effect of direct cooling is significantly better. Indirect cooling is equivalent to putting water in a basin, placing a small basin on top of the basin, and placing the product to be cooled in that basin. In contrast, indirect cooling is less effective. Therefore, this aspect must be considered when choosing a model. ③Some users have the following disadvantages: ⅰ Poor water quality can easily block the water channel of the machine and cause greater losses. ⅱWaste water resources and increase user cost. ⅲWhen the weather is too hot, the water temperature cannot meet the requirements, affecting the product quality and efficiency.

25 2022/04

Cryogenic Refrigeration System Circulation Pump Selection Guide

Product features and uses of pipeline canned pump

The pipeline type canned pump is a machine-pump integrated structure. The whole machine is mainly composed of pump body, impeller, connecting body, sliding bearing, stator, rotor, shielding sleeve, motor shell and other parts. The canned pump is a vertical single-stage single-suction centrifugal type, the inlet and outlet are on the same horizontal axis, and the diameter and specification are the same. It can be directly installed on any part of the pipeline like a valve, which is extremely convenient for loading and unloading and saves floor space. Product features of in-line canned pump: 1. The pump structure is compact, the machine and pump are integrated, and the volume is small. Its vertical structure has the advantages of small installation footprint, balanced operation, and no adjustment required for installation. 2. The inlet and outlet of the pump are designed as flanges with the same specifications and are located on the same center line, which can be directly installed on the pipeline like a valve, and the center is low to facilitate pipeline layout, and the installation is particularly convenient. 3. The pump is coaxial with the motor, and the axial dimension is short, which makes the pump run more smoothly and has low noise. 4. The traditional shaft seal method is cancelled, and the leakage of the conveying medium is avoided, so it has the remarkable feature of being completely leak-free. 5. Replacing conventional motor rolling bearings with sliding bearings makes the pump run particularly smoothly and with extremely low vibration and noise. 6. Easy to install and repair, no need to dismantle the pipeline system, just remove the connector nut, then all the rotor parts can be pulled out for inspection and maintenance. 7. The pump can be operated in series or in parallel according to the requirements of use, that is, the flow and head. The use of pipeline canned pump: 1. SPG ordinary pipeline canned pump is used to transport clean water and other liquids with physical and chemical properties similar to clean water. The use temperature of the medium does not exceed 80 ℃, suitable for industrial and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire pressurization, long-distance transportation, HVAC refrigeration cycle, bathroom and other cold and warm water cycle pressurization and equipment matching. It is especially suitable for occasions with high requirements on vibration and noise, such as underground pump rooms, air conditioning and refrigeration systems, etc. 2. The SPG hot water type pipeline canned pump is mainly used for conveying soft water with a temperature not exceeding 160 ℃ without solid particles. It is suitable for energy, metallurgy, chemical industry, textile, papermaking, and hot water pressurization in hotels, restaurants, bathrooms, and boilers. Circulation conveying and urban heating system circulation and other occasions. 3. The SPG anti-corrosion pipeline canned pump conveys liquids that do not contain solid particles, are corrosive, and have a viscosity similar to water.

25 2022/04

Product features and uses of pipeline canned pump

Recommended manufacturers of refrigeration pumps, canned pumps and magnetic pumps, choose Dalian Xincheng Pump Co., Ltd.

Dalian Xincheng Pump Co., Ltd. is a professional manufacturer of non-leakage pumps. The main products are refrigeration pumps, canned pumps and magnetic pumps. Widely used in chemical industry, petrochemical industry, refrigeration, medicine, textile, power station, environmental protection water treatment, papermaking and other industries. It is the preferred partner of well-known chemical and petrochemical enterprises at home and abroad. Xincheng Pump Industry is a technology-leading enterprise that continuously learns and masters the world's advanced zero-leakage pump technology and combines independent innovation. After years of research and development, it has continuously applied new design concepts, new materials, and new processes to non-leakage pump products. In order to better meet the needs of customers for high-quality, high-performance, energy-saving and environmentally friendly products.

25 2022/04

Recommended manufacturers of refrigeration pumps, canned pumps and magnetic pumps, choose Dalian Xincheng Pump Co., Ltd.

Structural principle and daily inspection and maintenance of canned pump

The structural principle of the canned pump is the same as that of the ordinary centrifugal pump, the difference lies in the drive motor. The motor of the canned pump is completely enclosed in the second layer of isolation sleeve or shielding sleeve, and the leakage prevention mainly depends on the internal anti-corrosion shielding sleeve. The shielding sleeve is sealed and welded to ensure that the stator winding and the rotor core are not immersed in the working liquid. The canned pump does not need to be lubricated with oil, and its bearings are lubricated by its own working fluid, which determines that the central shaft is a hollow shaft to facilitate the return of the lubricating working fluid. Inspection and maintenance of canned pump: 1. Daily inspection: ① Whether the pointer of the outlet pressure gauge is abnormal; ② Whether the current value is overloaded and abnormal; ③ Whether there is abnormal sound and vibration; ④ Pay attention to whether the bearing monitoring pointer is within the range of the red indicator; ; ⑥ whether there is liquid leakage. 2. Bearing sleep aid monitor The bearing monitor is mainly used to monitor the corrosion of the shielding sleeve and the wear of the bearing. The pointer of the monitor indicates the red area, indicating that the monitor contact is broken and the high pressure argon gas in the monitor leaks. It is caused by excessive wear of the bearing, and it is necessary to replace the monitor, bushing, thrust plate, bearing and eccentric nut, and the cost is 2600~2850 yuan; The wear of the shielding sleeve and the rotor shielding sleeve causes the motor to burn out. At this time, the maintenance cost is generally 20,000 to 30,000 yuan. 3. After the bearing exceeds the wear limit, it will cause the contact between the rotor shielding sleeve and the stator shielding sleeve, resulting in damage to the stator shielding sleeve, so pay close attention to the spot inspection of the bearing during operation. If the pump vibrates or has abnormal sound during operation, the pump should be disassembled, and the bearing should be checked. If the wear of the bearing and the shaft sleeve is found to be more than 0.3~0.5mm, it should be replaced according to the actual wear condition. From the actual operation situation, the general bearing wear is mainly radial, but the axial wear cannot be ignored. Check the axial wear mainly on the bearing and thrust plate. Even if the pump runs smoothly, regular inspections should be carried out, and the pump should be disassembled for regular inspections, mainly to check the wear of the bearings. The regular inspection period for canned pumps using domestic bearings is 3 months, and the inspection period for canned pumps using imported bearings is 6 months. The main points of canned pump maintenance: 1. Check the pump regularly, pay special attention to the monitor, and stop immediately if any abnormality is found. 2. The canned pump is lubricated by its own circulating flow, and it cannot be operated in shut-off, nor can it operate in reverse for more than 1 minute. 3. The throttling orifice plate is installed between the pump body outlet and the pipe flange, and is a stainless steel plate with a through hole smaller than the outlet pipe. Because the canned pump is lubricated by its own circulation, if there is no throttling effect of the throttling orifice, the pressure of the returning liquid will be very low. The bearing cannot be lubricated completely, resulting in bearing damage. In addition, the orifice plate can further increase the pressure. 4. The jacket is filled with cooling water to reduce the temperature of the equipment. When the temperature of the conveyed liquid is high, the jacket should be set. 5. Pay attention to the following points when assembling: Before installing the bearing into the bearing seat, put the lining into the incision on the periphery of the bearing, insert the bearing into the bearing seat, and screw the stop screw into the lining of the automobile accessories. Do not over-tighten it, otherwise it will easily cause early wear of the bearing; when installing the bearing seat, the recirculation hole of the front bearing seat has both the functions of exhaust and liquid drainage, and the recirculation hole should be aligned up and down, not flipped.

25 2022/04

Structural principle and daily inspection and maintenance of canned pump

Product features and uses of pipeline canned pump

The pipeline type canned pump is a machine-pump integrated structure. The whole machine is mainly composed of pump body, impeller, connecting body, sliding bearing, stator, rotor, shielding sleeve, motor shell and other parts. The canned pump is a vertical single-stage single-suction centrifugal type, the inlet and outlet are on the same horizontal axis, and the diameter and specification are the same. It can be directly installed on any part of the pipeline like a valve, which is extremely convenient for loading and unloading and saves floor space. Product features of in-line canned pump: 1. The pump structure is compact, the machine and pump are integrated, and the volume is small. Its vertical structure has the advantages of small installation footprint, balanced operation, and no adjustment required for installation. 2. The inlet and outlet of the pump are designed as flanges with the same specifications and are located on the same center line, which can be directly installed on the pipeline like a valve, and the center is low to facilitate pipeline layout, and the installation is particularly convenient. 3. The pump is coaxial with the motor, and the axial dimension is short, which makes the pump run more smoothly and has low noise. 4. The traditional shaft seal method is cancelled, and the leakage of the conveying medium is avoided, so it has the remarkable feature of being completely leak-free. 5. Replacing conventional motor rolling bearings with sliding bearings makes the pump run particularly smoothly and with extremely low vibration and noise. 6. Easy to install and repair, no need to dismantle the pipeline system, just remove the connector nut, then all the rotor parts can be pulled out for inspection and maintenance. 7. The pump can be operated in series or in parallel according to the requirements of use, that is, the flow and head. The use of pipeline canned pump: 1. SPG ordinary pipeline canned pump is used to transport clean water and other liquids with physical and chemical properties similar to clean water. The use temperature of the medium does not exceed 80 ℃, suitable for industrial and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire pressurization, long-distance transportation, HVAC refrigeration cycle, bathroom and other cold and warm water cycle pressurization and equipment matching. It is especially suitable for occasions with high requirements on vibration and noise, such as underground pump rooms, air conditioning and refrigeration systems, etc. 2. The SPG hot water type pipeline canned pump is mainly used for conveying soft water with a temperature not exceeding 160 ℃ without solid particles. It is suitable for energy, metallurgy, chemical industry, textile, papermaking, and hot water pressurization in hotels, restaurants, bathrooms, and boilers. Circulation conveying and urban heating system circulation and other occasions. 3. The SPG anti-corrosion pipeline canned pump conveys liquids that do not contain solid particles, are corrosive, and have a viscosity similar to water.

25 2022/04