Gas wall-hung boilers have become the heating choice for more and more homes. Most users who have used wall-hung boilers know that wall-hung boilers need correct use and regular maintenance to better serve our heating and provide us with better heating. Use experience. As one of the core components of the wall-hung boiler, the water pump provides a stable pressure and flow rate for the stored heat carrier of the wall-hung boiler, that is, hot water, so as to achieve the purpose of heating and hot water use in the whole house. Therefore, the maintenance of the water pump is particularly important. Can you understand some of its failure causes and maintenance methods? Causes and analysis of failures Symptom 1: Does not start Failure analysis 1. The exhaust valve of the water pump is not opening and venting during water injection, 2. There is no demand for indoor temperature, 3. The voltage is too low, 4. The internal short circuit of the water pump, 5. The external wiring is loose, 6. The connecting wire is broken or the connector is not connected properly, 7. The water pump is stuck. Symptom 2: There is a "click" sound Failure analysis 1. Idling without water for a long time, 2. Solid impurities enter the water pump, 3. The blade is broken. Pump maintenance method The water pump does not run after power on, it is called "locking", which is a common situation of wall-hung boiler water pump, which often occurs after the wall-hung boiler has not been running for a long time. When this happens, you can try to solve it by yourself using the following methods. 1. Locate a large screw on the top of the water pump, use a large "one" screw to loosen it, and then use a suitable screw to loosen the inner shaft slowly. After the jamming phenomenon disappears, remove the outside. Tighten the big "one" screw. 2. Many wall-hung boiler products have the "locking" function of the waterproof pump that comes with the system. When the water and electricity three links are normal, the water pump will automatically run once every set time to prevent the occurrence of "locking". If you go out for a long time without people at home, you only need to adjust the boiler to operate at low temperature, do not disconnect the water and electricity, to ensure that the water pump in the system runs without hindrance. After a non-heating season, the heating pipes of wall-hung boilers are left unused, which is likely to produce impurities after rust and microbial precipitation. The water pump is an internal component of the wall-hung boiler. These impurities can easily hinder the operation of the water pump, causing it to jam, increase the noise, or even damage it. The ideal solution is to release and clean the water in the heating pipe when starting to use heating in winter, then install a fine-mesh filter at the backwater of the wall-hung boiler, and clean up the dirt in time . Limescale is the "culprit" of many wall-hung boilers. Limescale is the number one "killer" of water pumps. It can penetrate into every water-passing area inside the water pump, wear the water pump during operation, generate noise, and seriously cause the pump Stuck or burned out, making the boiler "paralyzed". Especially for areas with harder water, this problem occurs more frequently, so it is necessary to clean and descaling the boiler regularly.

Gas stove countertops on the market are generally divided into stainless steel countertops, glass countertops, ceramic panels and enamel panels. The glass countertops in gas stoves are common and easy to clean. Splash oil after each use. After washing the dishes, use a scouring pad dipped in the detergent and wipe it off with a clean rag. Pay special attention when cleaning: Never use a steel wire to wipe the glass countertop. The strength of tempered glass is several times that of ordinary glass, mainly because of the protective layer (also called stress layer) on both sides of it, but the protective layer is very thin. Once it hits a harder object or cleans the surface with a steel wire, it is easy to scratch, the protective layer is damaged, the strength decreases, and the countertop is prone to bursting. In fact, in order to better protect the countertops of gas stoves, stainless steel countertops and enamel countertops should not be wiped with steel wire, so as not to affect the smoothness of the surface, just use a scouring pad or soft cloth dipped in washing and scrubbing.

a) Unscrew the slotted copper screw on the end of the water pump, exhaust the air of the water pump, and restart. b) If the heating system distributor is not opened, open the distributor; if the filter is clogged, remove the filter, rinse it, and install it, make up water and exhaust, and restart. c) If there is air in the pipe and it is not exhausted, exhaust the air and restart. d) If the water flow switch fails, use a multimeter to detect whether there is a switch signal output during operation. If there is a signal output, that is, the water flow switch is turned on, it may be that the connector is not well connected or the wire is disconnected, then plug the connector or replace the wire; if the wire and the connector are intact, the controller is faulty, replace the controller . If there is no signal output, it means that the water flow switch is stuck or the waterway is blocked; if the water flow switch is stuck, remove the water flow switch to rinse and reinstall; and replenish water. Exhaust and restart again; waterway blockage is handled according to method b. e) Install a distributor (switch) at the heating water outlet, and turn off the distributor a bit smaller. Fan pressure failure ①Fault phenomenon: if the fan does not run or runs slowly, the controller will give an alarm, and the display will show the fan air pressure fault code. Causes of failure: a) The fan is stuck or burned out; b) The connector is in poor contact; c) The controller is faulty, d) The capacitor is damaged, and e) The mains voltage is too low. Solution: a) Check the fan with a multimeter, replace the fan when the circuit breaks, or replace the fan if it is stuck. b) The connector is in poor contact and reconnect it. c) If the controller fails, replace the controller. d) If the fan impeller can be started by pulling it by hand, the capacitor is damaged. Replace the capacitor. e) Install a voltage regulator to increase the mains voltage to 220V. ②Fault phenomenon: the fan is running normally, the controller does not ignite, the main controller gives an alarm, and the display shows the fault code as fan air pressure failure. The cause of the failure: a) the wind pressure switch is short-circuited, b) the wind pressure switch is not closed. c) Poor contact of the connector. d) The suction and exhaust ports are blocked. e) The controller is faulty. Solution: a) Check with a multimeter. If the wind pressure switch is closed before the fan starts, replace the work or adjust the wind pressure switch. b) If it is normal before the fan is started, but does not close after the fan is started, the air pressure switch can be adjusted. If the problem cannot be solved after the adjustment, replace the air pressure switch. ; Also check whether the venturi tube or the wind pressure tube is blocked. c) If the connector is in poor contact, reconnect it. d) If all the previous faults are eliminated, check whether the suction and exhaust are smooth or blocked; if the suction and exhaust are not smooth, clean the flue; if it is blocked, clean it. e) The faults of a, b, c, d have been eliminated, then check whether the pulse igniter connector is in contact

First of all, for safety and security, at high frequencies, the rotor induced current will be very large to prevent the motor shaft current. If the electrically insulated bearing is not used, current will flow through the bearing to form a circulating current, and the bearing is likely to be damaged due to heat generation or electric water splash. Then when the motor is running, the potential difference between the two ends of the shaft or between the shaft and the bearing is called shaft voltage. If the two ends of the shaft form a loop through the motor frame, the shaft voltage forms the shaft current. The shaft current is generated by the shaft voltage through the motor shaft, bearing, stator frame or auxiliary device forming a closed loop. Under normal conditions, the shaft voltage of the motor is low, and the lubricating oil film in the bearing can play a role in insulation, and no shaft current will be generated. However, when the shaft voltage is high, or the oil film is not formed stably at the moment the motor starts, the shaft voltage will cause the lubricant film to discharge and break down to form a loop to generate shaft current. The high temperature generated by the release of partial discharge energy of shaft current can melt many small areas on the bearing inner ring, outer ring or ball, and form grooves, which will generate noise and vibration. If it is not found and handled in time, it will lead to bearing failure, which will bring damage to production. Great influence. The obvious feature of the electric corrosion of the high-frequency shaft current on the bearing in the frequency conversion speed regulation system is the production of "washboard" dense groove stripes on the inner and outer rings and balls of the motor bearing. The flashover caused by the induced current on the spindle and the bearing can cause defects such as corrosion on the bearing surface, shrinkage on the metal surface, and grooves on the rolling track of the bearing. One of the main characteristics of insulated bearings is that there is a very thin (um level) coating on the surface, which is responsible for electrical insulation and can resist electric flashover generated at a voltage exceeding 500V. A thicker coating can resist high voltage of 1000V. Discharge. Therefore, the motor must use an electrically insulated bearing at one end.

1. The use environment should always be kept tidy, the surface of the fan should be kept clean, and there should be no debris at the inlet and outlet. Eliminate dust and other debris in the fan and pipes on time. 　　2. It can only be operated when the wind turbines are fully political. Tongjin must maintain sufficient power supply capacity, keep the voltage intact, and strictly prohibit phase loss operation. The power supply line must be a dedicated line, and temporary power supply lines should not be used for a long time. 　　3. During the operation of the fan, it is found that the fan has abnormal noise, the motor is severely feverish, the shell is electrified, the switch is tripped, and it cannot be started. It should be shut down immediately for inspection. In order to ensure safety and security, maintenance is not allowed while the fan is running. After the inspection, a test run should be carried out for about five minutes, and the machine should be turned on after confirming that there is no abnormal phenomenon. 4. Do not add or replace the lubricating grease on the bearing according to the conditions of the use environment (the motor block bearing does not need to replace the lubricating grease during the service life). In order to ensure good lubrication of the fan during operation, the number of refueling shall not be less than 1000 hours Second, seal the bearings and motor bearings, and fill 2/3 of the inner and outer rings of the bearing with ZL-3 lithium-based lubricating grease. Running short of oil is strictly prohibited. 　　 5. The fan should be stored in a dry environment to prevent the motor from getting damp. When the fan is stored in the open air, measures should be taken to prevent rain. During storage and handling, the fan should be prevented from bumping to avoid damage to the fan. 　　The choice of the fan shell mainly depends on the thickness of the coating of the cold galvanized sheet. It is thin and easy to rust, so it is not suitable for selection; the fan inlet cover is made of galvanized steel sheet and glass. It is better to choose galvanized steel sheet; the matching motor power is 750 watts and 1100 watts, and the motor power of 1100 watts is selected. Good; there are many types of fans, including stainless steel, galvanized steel, aluminum alloy, and color steel. In terms of performance, stainless steel fan blades should be used. There are various fan blade shapes, and the shape and processing technology with good functions are complex; the rolling assembly has two kinds of die-cast aluminum and cast iron. In comparison, the die-cast aluminum has better performance; the automatic opening device of the shutter has centrifugal hammer type and gravity hammer type Gentle style. From experience, the centrifugal hammer type is less messy, the gravity hammer type is susceptible to dust accumulation, and the opening and closing is easy to fail. The wind blowing type is mainly used for 36-inch fans. The blinds mainly depend on whether their tightness is good. Fan equipment used in a large number of industries such as electric power, steel, cement, papermaking, etc., because the conveyed gas medium contains a large amount of hard dust particles and acid gas, the flow parts of these equipment are subject to strong washing erosion, especially its The impeller, the heart component, runs at a linear speed of 160 meters per second at the end of its blades, and the wear speed is more severe than other parts. According to statistics, impellers made of ordinary carbon steel or general wear-resistant steel 16Mn generally have a service life of only half a year, and the shortest one is only tens of days. Although various surface anti-wear measures such as surfacing, spraying, spray welding, Coating with polymer wear-resistant materials, etc., can hardly improve the service life significantly. Among the more commonly used methods, surfacing welding is used more often, and the effect is acceptable. Generally, it can be used for more than one year without large-scale repairs. The disadvantage is that because of the large amount of heat input by surfacing welding, if the control is not good, the impeller will be deformed, and it cannot be repaired and used repeatedly. Thermal spray spray welding also has the same problem, which greatly limits their applications. 　　 At present, a better method is to paste or inlay wear-resistant ceramics on the surface of the live volute of the impeller, because wear-resistant ceramics have good wear-resistant performance, which can greatly improve the wear-resistant performance of the extension.

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