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21

2024-05

[Exhibition Review] "Livestock" Development, Henan New Shanghai Perfect Appears at 2024 China Animal Expo!

On the afternoon of May 20, 2024, the 21st (2024) China Animal Husbandry Expo and 2024 China International Animal Husbandry Expo (hereinafter referred to as "Animal Expo"), which lasted for three days, ended perfectly in Nanchang Greenland International Expo Center, Jiangxi Province.

2024-05-21

[Exhibition Review]

14

2024-05

[Exhibition Forecast] Henan Xinhu invites you to participate in 2024 China Animal Expo!

From May 18 to 20, 2024, the 21st (2024) China Animal Husbandry Expo and 2024 China International Animal Husbandry Expo (hereinafter referred to as "Animal Expo") will be held in Nanchang Greenland International Expo Center

2024-05-14

[Exhibition Forecast] Henan Xinhu invites you to participate in 2024 China Animal Expo!

14

2023-08

Reasons for water ring vacuum pump to trip and stop working

In the process of using the water ring vacuum pump, there will be tripping. When this happens, we have to analyze the reasons. Let's talk about this problem. Two water ring vacuum pump units are merged into a pipeline, and there is no valve installed between the two pumps. Only a one-way valve is installed at the inlet. The one-way valve cannot be completely sealed. Since the working mode adopted is one for use and one for standby, the phenomenon of pumping water from the other pump will occur when one of them works, and even the phenomenon of pumping back circulating water and atmosphere from the exhaust pipe will occur, which will also be the cause of the trip. In the process of working, if the suction from the bottom of the tank is used up each time, when the work is stopped, the suction pipe and the water ring vacuum pump unit are unblocked due to the negative pressure formed in the tank. Under the action of negative pressure, the water in the pump will be sucked into the tank. If the equipment stops working and starts the water ring vacuum pump again, a large amount of water is sucked into the pump at the bottom, which will directly cause excessive load and lead to over-current tripping. When this problem occurs, what we need to do is to analyze the cause and then solve the problem.

2023-08-14

Reasons for water ring vacuum pump to trip and stop working

14

2023-08

Causes and Methods of Filling Water Before Starting Centrifugal Pump

Before starting the heart pump, it must first be filled with water to discharge the air in the pump housing. According to the working principle of the centrifugal pump, when the impeller rotates, the water is thrown to the outer edge of the impeller by centrifugal force, a vacuum is formed at the center of the impeller, and the water is sucked in, forming a continuous working process of the water pump. If the pump is not full of water when starting, but full of air, because the density of air is much less than the density of water, the centrifugal force generated by the air will be much less than the centrifugal force of the water when the impeller rotates at the same speed. This will gather in the center of the impeller, so that the center of the impeller can not form enough vacuum, hinder the suction of water, affect the formation of continuous working process of the pump. Therefore, before the centrifugal pump is started, it must first be filled with water to drain the air in the pump body to maintain the normal operation of the pump. The centrifugal pump must fill the water pump and the inlet pipe with water before starting, otherwise the water pump cannot work. After the centrifugal pump is started, no water is often caused by the fact that the air in the pump is not drained and the water is not filled. Before starting the pump, fill the water tank with water for sealing. After the water pump is started, the water pump enters the water from the vacuum box. Due to the drop of the water level of the water tank, a certain vacuum is formed in the water tank. The water in the water inlet will enter the water tank through the water inlet pipe under the action of atmospheric pressure, thus forming a water circulation and making the water pump start to operate normally. This water filling method has the following advantages: small hydraulic loss, high efficiency of the pumping station, low labor intensity of technicians, easy to start, and conducive to the realization of automatic control of the pump unit. There are two main water filling methods before starting: one is to fill water by assembling a bottom valve, which is a one-way valve and is installed at the inlet of the water inlet pipe. The disadvantage of this method is that the head loss of the bottom valve is large, which affects the device efficiency of the water pump. The other is to fill water without a bottom valve. The great advantage of this method is energy saving, which can save 10% ~ 15% compared with a pump station with a bottom valve.

2023-08-14

Causes and Methods of Filling Water Before Starting Centrifugal Pump

14

2023-08

Points for attention to the suction pipe and outlet pipe of the sewage self-priming pump

Points for attention to the suction pipe and outlet pipe of the sewage self-priming pump: (1) The suction pipe of the sewage pump Each sewage pump should be set up with a separate suction pipe, and strive to be short to improve water conservancy conditions, reduce head loss, and reduce the possibility of impurities blocking the pipeline. The design flow rate of the suction pipe is generally 1.0~1.5 m/s, and the low rate shall not be less than 0.7 m/s to avoid precipitation in the pipe. When the suction pipe is very short, the flow rate can be increased to 2.0~2.5 m/s. In order to facilitate the removal of air stored in the suction pipe, the horizontal part of the suction pipe should be slightly raised along the direction of the water flow, and the pipe slope can be 0.005. When the connection between the suction pipe and the water pump needs to be tapered, the eccentric reducer shall be adopted. The entrance of the suction pipe should be equipped with a bell mouth, the diameter of which is 1.3 to 1.5 times the diameter of the suction pipe. The bell mouth is installed in the water accumulation pit of the water collection tank. For self-filling water pumps, valves shall be installed on their suction pipes for maintenance. If the pump is not self-filling, the vacuum pump or water ejector should be used to start the pump, and the bottom valve is not allowed to be set on the suction pipe, because the bottom valve is easy to be blocked in the sewage, which affects the starting of the pump and increases the head loss and power consumption. (2) The flow rate of the outlet pipe of the sewage pump is generally not less than 1.5 m/s. When two or more pumps share one outlet pipe and only one pump works, the flow rate shall not be less than 0.7 m/s to avoid deposition in the pipe. When the outlet pipe of the pump is connected to the outlet main pipe (connecting pipe), it shall not be connected from the bottom of the main pipe, so as to avoid siltation in the outlet pipe of the pump when the pump stops running. When two or more water pumps share a water outlet pipe, the water outlet pipe of each water pump shall be equipped with a valve, and a check valve shall be set between the valve and the water pump; if the water pump adopts a separate water outlet pipe and is free flow, generally no check valve may be set, and all valves shall be installed in the horizontal section as far as possible to avoid dirt settling on the valve plate. The pipeline laying in the sewage pumping station generally adopts surface installation. The suction pipe is permanently placed on the ground, and the outlet pipe is mostly installed overhead due to the deep pump room, usually on the bracket along the wall. The layout of the pipeline shall not hinder the transportation and maintenance work in the pumping station. It is not allowed to install the pipeline over the electrical equipment. It shall not hinder the transportation, equipment hoisting and maintenance in the station. Attention points for the suction pipe and outlet pipe of the ground sewage pump at the passage. Attention points for the suction pipe and outlet pipe of the sewage pump should not be less than 2.0m from the bottom of the pipe, and the pipeline should be stable. In order to facilitate the installation and disassembly, the pipeline in the pump station generally adopts flange interface. Corresponding anti-corrosion measures shall be taken for pipelines and valves.

2023-08-14

Points for attention to the suction pipe and outlet pipe of the sewage self-priming pump

28

2022-07

Influence of abnormal vibration and temperature rise of multistage pump on bearing and treatment measures

1. Influence of abnormal vibration of multi-stage pump on bearing During the use of multi-stage pump, abnormal vibration damage to the bearing is very obvious, such as peeling, indentation, rust, crack, wear, etc., which can be reflected. The size of abnormal vibration of the water pump can be measured by the bearing vibration measurer, and the abnormal situation of the water pump can be inferred by the vibration frequency distribution. The measured value will be different due to the use conditions of the bearing or the installation position of the sensor, therefore, Changsha Zhonglian Pump Industry needs to analyze and compare the measured values of each machine before determining the judgment standard. 2. The influence of multi-stage pump temperature on bearing Bearings that have been in high temperature for a long time are very unfavorable. Sometimes the overheating of multi-stage pump bearings is due to the lubricant of the bearings. If the multi-stage pump bearings are operated in an environment of 125 ℃ for a long time, the service time of the water pump will be reduced, resulting in insufficient lubrication, excessive lubrication, impurities in the lubricant, excessive load of the water pump, bearing damage, insufficient bearing clearance, high friction caused by the oil seal of the water pump, etc. 3. Post-treatment measures for bearing temperature rise of multi-stage pump Multi-stage pumps are prone to temperature rise during use. When the temperature of the water pump bearing rises, it is first necessary to find out whether the bearing temperature rises due to misoperation. If the bearing temperature does rise, you need to do The following measures are used for cooling: 1. First check whether the water pressure, water flow and pipeline system of the water pump are normal. If the water pressure is too low, the filter of the water pump will be blocked. If it cannot be handled in time, it is recommended to stop the machine as soon as possible, and then start the operation after the fault is confirmed to be eliminated; 2. Check the oil pressure of the water pump governor. If the water pump oil pressure is too low, the water pump cooling water hydraulic valve will be closed; 3. Check the abnormal sound of the water pump bearing and check whether the swing of the water pump bearing is abnormal; 4. Check whether the lubricating oil of the water pump is abnormal, and check whether it has deteriorated. If it is confirmed that it has deteriorated, stop the machine and replace it with new lubricating oil; 5. Check whether the lubricating oil level of the water pump is normal. If it is not normal, check whether the oil drain valve of the oil tank is closed tightly. If the oil drain valve of the oil tank is closed tightly, add lubricating oil. If the sealing rubber pad is leaking oil, stop the machine.

2022-07-28

Influence of abnormal vibration and temperature rise of multistage pump on bearing and treatment measures
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