1, centrifugal water pump is widely used in automobile engines. Its basic economic structure consists of water pump through the shell, connecting disk or pulley, water pump shaft and bearing or connecting shaft bearing, water pump for impeller and water seal technology device and other parts of the important composition, is the main working parts of the car.

2, support system water pump shaft bearings are lubricated with grease, so to prevent due to coolant leakage into the grease caused by the impact of grease as well as emulsification, while preventing grease leakage. Automotive water pump flange to prevent information leakage of sealing technology measures mainly include water seals and gaskets. The dynamic sealing ring of the water seal and the shaft are set between the impeller and the bearing through the interference fit, and the static sealing seat of the water seal is pressed on the pump casing to achieve the purpose of sealing the pump casing. Coolant.

3, automotive electronic water pump shell through a gasket and the engine for connection, support bearings and other moving functional parts. The water pump housing also has a drain hole located between the water seal and the bearing. Once it is found that coolant can leak through the establishment of the water seal, it can leak through the drain hole to prevent coolant from entering the Chinese bearing cavity to disrupt bearing lubrication and cause a part to rust. If the engine stops and coolant is still leaking, the water seal will be damaged.

With the increasing popularity of automobiles, as the entire engine “heart” components - automotive water pump, in the entire engine system plays a very important role, automotive water pump is generally composed of water pump housing, bearings, water seals, impellers, flanges, pulleys and their connectors. Bolts and other components.

From the point of view of market demand, due to China's automotive water pump industry has obvious production cost advantages, and the domestic enterprise market for water pump supporting the larger scale of demand, so the main domestic and foreign automotive water pump enterprises have a certain scale of production bases in the country, and the demand for water seals is also maintained at a high scale. Influenced by the downstream market, 2015-2021, China's automotive water pump industry market demand remained stable overall, 2020 for the lowest point in recent years, 2021 rebounded to 26.658 million units. From the point of view of export data, China's automotive water pump industry exports as a whole showed a fluctuating upward trend, after 2018, by the impact of the trade war between China and the United States, the industry's export volume has dropped significantly. 2021, due to the domestic response to the epidemic properly, the overall stability of automotive water pump supply capacity in a more stable role in the role of global demand favorite, the industry's export volume rebounded sharply, reaching 25.903 million units. Affected by the growth of exports, China's automotive water pump industry production reached 47,007,300 units, close to the highest level in history in 2017.

As the automotive water pump water seal is an important part of the automotive water pump, its value accounts for the proportion of the entire pump is relatively stable, while different types of water pumps on the quality of the water seal, processing fineness, and the requirements of the equipment and technology are also more obvious differences, China's development of the automotive water pump industry due to the relatively late start in the technological strength is not as good as the foreign pump manufacturers, the product is also mainly concentrated in the field of the low and medium-end, the demand for water seals is also mainly in the middle and low-end products. Demand for water seals is also mainly based on low-end products. From the import and export data, China's imports of automotive water pumps are mainly high-end products, and due to the downstream thermal management system demand upgrading, the average price of imports showed a significant upward trend, but the export price is relatively low and generally stable.

From the industry scale, in 2021, China's automotive water pump industry market size reached 5.076 billion yuan, the import amount reached 1.796 billion yuan, the export amount rose to 1.97 billion yuan, the industry's sales revenue of about 5.25 billion yuan, a sharp rise over the previous year.

From the automotive water pumps of various types of average price, the average price of imported products is significantly higher than the average price of exports, the average price of the domestic market as well as the average price of domestic products. From the relevant price can be seen from the domestic automotive water pump products are mainly low-end products, high-end products mainly rely on imports.

International pipe flange standard mainly has two systems, namely, Germany DIN (including the former Soviet Union) as the representative of the European pipe flange system and the United States ANSI pipe flange as the representative of the American pipe flange system. In addition, there is the Japanese JIS pipe flange, but in the petrochemical plant is generally used only for public works, and in the international influence is small. Now the countries pipe flange profile below:

1, Germany and the former Soviet Union as the representative of the European system of pipe flange 2, the American system of pipe flange standards, ANSIB16.5 and ANSIB16.47 as a representative of the 3, the United Kingdom and France pipe flange standards, the two countries have two sets of pipe flange standards.

To sum up, the international common pipe flange standard can be summarized as two different, and can not be interchangeable pipe flange system: a Germany as the representative of the European pipe flange system; the other is the United States as the representative of the American pipe flange system.

IOS7005-1 is the International Organization for Standardization in 1992 promulgated a standard, the standard is actually the United States and Germany two sets of series of pipe flanges merged into the pipe flange standard.

Flanges, also known as flanged flanged disks or flanges. The flange is a component that connects the shaft to the shaft and is used to connect the pipe ends; it is also used in the flange on the inlet and outlet of the equipment and the connection between two devices, such as the speed reducer flange.

Flange design should pay attention to several issues

Workpiece performance requirements

The two flanges of the large flange are vertical, while the table of the vertical lathe is rotating horizontally, so the main function of the workpiece is to use the bolt holes on the large flange to connect the workpiece with the flange.

When the tooling is clamped on the table, the flange surfaces to be machined should be concentric circles, parallel to the vertical lathe table. In order to reduce the number of fixtures, the fixture should be able to change the clamping position to ensure that the flanges at both ends of the elbow can be machined on one fixture. At the same time, the tooling needs to have sufficient rigidity, otherwise it will seriously affect the processing quality of the flange sealing ring groove.

In the case of meeting the requirements of use, the height of the mold should be reduced as much as possible to improve the stiffness and ease of operation. After the tooling is fixed with the large flange, the rotational radius should not exceed the working radius of the vertical lathe, and it can be easily clamped and easily adjusted to facilitate the feed cutting.

Tooling design and manufacture

The big flange consists of 2 pieces of mutual 900 clamping base plate, 2 pieces of flange pallet, vertical plate and 4 pieces of reinforcing plate. In order to ensure the rigidity of the workpiece, the welding of the connecting plate should be through the groove welding, and the welding angle should be between 20~30 mm.

Drill corresponding bolt holes in the flange plate to ensure that the flange can be accurately connected to the bolts used in the flange plate, with a gap between the back of the flange and the support plate, which can be placed on a small manual jack. At the same time, notches are opened in the flange support plate in the direction of the vertical plate to allow the elbow to be fitted into the tooling. The use of a thick steel plate with an approximate groove structure meets the stiffness requirements for cutting.

Turning processing

In the processing of large flanges, the bottom plate is adjusted downward, clamped on the vertical worktable, and the elbow flange is manually installed on the flange. The large end flange is fixed with bolts and support plates to ensure that the flange face is concentric and parallel to the vertical table before cutting.

When processing the small end flange, the tool base plate is clamped to the vertical table, and after the small head flange and the back of the small support plate are fastened, the small end flange and the small support plate are fastened with six small manual jacks in order to process the small flange, and the perpendicularity of the large flange should be ensured when finding the cutting.

Large flange of the tooling structure is simple and reasonable, easy to manufacture, good stiffness, easy to find and adjust the processing, fully meet the requirements of the vertical lathe processing of large elbow flange, the three groups of elbow flange are qualified, in the absence of end processing machine tools under the conditions of the opening up of a vertical lathe processing of similar parts of a new way.

Tooling rigidity calibration

The cantilever beam of slot structure is subjected to bending and torsion when the force model is turned, and should be calibrated for deflection and angle of rotation. Through the above calibration, the maximum deflection is 7.27×Lo-7m and the maximum angle of rotation is 8.969×10-5.

In the relevant part of the increased steel, the stiffness is much higher than the calculated value, the stiffness fully meets the requirements of the cutting force, the maximum turning diameter of the tool and elbow flange is 2.42m ≤ 3.50m (double-column vertical automobile turning diameter), so this tooling is theoretically feasible.

Automotive water pump flange generally has the function of self-priming. Self-priming means that when the water pump of the water pump is filled with air, the negative pressure (vacuum) formed when the pump carries out its work will be lower than the water pressure of other water outlets under the action of atmospheric pressure. Upward, and then discharged from the drain end of the pump. Prior to this process, there is no need to add “priming water (water guide)”. Micro-pumps with this self-priming capability are called “micro self-priming pumps” and are similar in principle to miniature air pumps.

Automotive electronic water pump combines the advantages of self-priming pumps and chemical pumps, using a variety of corrosion-resistant imported materials can be made, with acid, alkali, corrosion and other properties; suction range of up to 5 meters, basically no noise. Superb workmanship, not only has the function of self-priming, but also a large flow rate (up to 25 liters / min), high pressure (up to 2.7 kg), stable performance, easy to install. Therefore, this kind of high flow control water pump is commonly used in the development of new energy vehicles.

The engine can be driven by the pulley to our car electronic water pump as well as bearings and impeller rotation, the coolant in the car control water pump in the impeller driven enterprise together with the rotation, in the role of centrifugal force is thrown to the edge of the car using the water pump shell. The force, at the same time, can be produced with a certain pressure, and then from the outlet or water pipe as well as outflow. Outflow. In the center of the impeller, the coolant is thrown out and the pressure is reduced. The coolant in the water tank in the car electronic water pump carries on the pressure difference between the inlet and the impeller center development, through the use of water pipes sucked into the impeller, to achieve the reciprocal circulation of the system coolant.

The bearings supporting the shaft of the automotive water pump flange are lubricated with grease, so it is important to prevent both the lubricant from penetrating into the grease to cause emulsification of the grease, and to prevent the grease from leaking out. Automotive water pump flange to prevent information leakage of sealing technology measures mainly include water seals and gaskets. The water seal dynamic seal ring and shaft are installed between the impeller and bearing through interference fit, and the water seal static seal seat is pressed on the automotive water pump flange shell to realize seal cooling.

The automotive water pump flange housing can be connected to the engine through the gasket, and support the bearings and other moving functional parts. The automotive water pump flange housing also has a drain hole which is located between the water seal and the bearing. Once it is found that coolant can leak through the establishment of the water seal, it can leak through the drain hole to prevent coolant from entering the Chinese bearing cavity to disrupt bearing lubrication and cause a part to rust. If the engine stops and coolant is still leaking, the water seal will be damaged.

Tensioner pulley parts suppliers said, tensioner pulley parts are divided into accessory tensioner pulley (generator belt tensioner pulley, air conditioner belt tensioner pulley, mechanical supercharger belt tensioner pulley, etc.) and timing belt tensioner pulley. Tensioning wheel according to the tensioning method is mainly divided into mechanical automatic tensioning wheel and hydraulic automatic tensioning wheel. Tensioning wheel is mainly composed of fixed shell, tensioning arm, wheel body, torsion spring, rolling bearing and spring sleeve. According to the different degree of belt tension, automatically adjust the tension force, so that the transmission system is stable, safe and reliable. Tensioning round is a wearing parts such as automobile parts, the belt is easy to wear after a long time, after grinding the belt groove will be elongated, when the tightening round through the hydraulic device or damping springs to automatically adjust the belt's wear and tear, and other have a tightening round of the belt runs more smoothly, low noise, and can prevent slippage.

Tensioning wheel is a routine maintenance project, general tensioning wheel accessories 6 -80,000 km need to be replaced, usually if the front end of the engine has an abnormal noise or tensioning wheel tensioning mark position is too much off-center, it represents the tensioning force is insufficient. It is recommended to replace the generator belt, tensioner pulley, torque pulley and single pulley in 60 -80,000 kilometers (or when there is abnormal noise in the front-end accessory system). The role of the tensioning wheel is to adjust the tension of the belt, to a certain extent, to reduce the vibration of the belt, to prevent the belt from slipping, to ensure the normal and stable operation of the transmission system.

The supplier of tensioning wheel accessories said that the tensioning wheel accessories are generally replaced with the belt, pallet and other accessories together to avoid worries. Tensioning wheel in actual use, in order to maintain proper belt tension, to avoid belt slippage, to compensate for belt wear, aging caused by elongation, a certain torque is required. When the belt tensioner pulley is in operation, the moving belt may cause vibration in the tensioner pulley, resulting in premature wear of the belt and the tensioner pulley. For this reason, a resistance mechanism is added to the tensioner. However, there are many parameters affecting the torque and resistance of the tightening wheel, and the influence of each parameter is not the same, so the relationship between the components of the tightening wheel and the torque and resistance is very complicated. The change of torque directly affects the change of resistance and is the main factor affecting resistance, while the main factor of torque is the parameter of torsion spring. Appropriate reduction of the mid-diameter of the torsion spring can increase the resistance value of the tensioner pulley. The tensioning wheel is a belt drive tensioning device. When the belt center distance cannot be adjusted, the belt can be tensioned with the tension pulley. Tension wheel is pressed on the belt to change the pulley winding angle or control the belt tension of the active wheel, is a belt drive tensioning device; tensioner is a belt, chain drive system commonly used to keep the device, which is characterized by maintaining the belt, chain in the transmission process can have the appropriate tension, so as to avoid belt slippage, or to avoid synchronous belt jumping teeth, tooth and drag out; a car generally have 1 to 2 tensioner wheel, the same size, mainly to play the role of the belt, the main role of the tensioning wheel. Tensioning wheel, the same size, mainly play the role of belt tightening. Timing tensioning wheel and ordinary tensioning wheel is no difference, its working principle is different.

Tensioner wheel fittings suppliers said that the tensioner wheel fittings are generally set on the inside of the loose edge, so that the belt is only one-way bending; at the same time, in order to ensure that the winding angle of the small pulley is not reduced too much, the tensioner wheel should be installed as close as possible to the large pulley.

Function:Tensioning wheel accessories for belt drive tensioning device, when the belt center distance can not be adjusted, you can use the tensioning wheel to tighten the belt.

Composition:Timing tensioning wheel is mainly composed of fixed shell, tensioning arm, wheel body, torsion spring, rolling bearing, spring sleeve and so on. According to the different degree of belt tightness, the tensioning force can be adjusted automatically, so that the transmission system is stable, safe and reliable.

Tensioner wheel fittings are the elasticity of the timing belt. Usually use a timing belt to avoid worrying. Other parts are not needed. Timing tensioning wheel is mainly composed of fixed housing, tensioning arm, wheel body, rolling bearing and sleeve. It can automatically adjust the tensioning force according to the different degree of loosening and tightening, so that the transmission system is stable, safe and reliable.

Tensioning wheel accessories are wearing parts of automobiles and other parts, the use of long time is easy to elongate, some tensioning wheel can be automatically tensioned, in addition to the tensioning wheel runs more smoothly, less noise, and can prevent slipping. Tension wheel accessories are synchronous belt tension, generally used instead of synchronous belt to avoid worries. Other parts do not have to, as long as the regular maintenance can be, but the oil must be often, the general driving distance of four or five thousand kilometers or more should be.

Tensioning wheel accessories is a car and other parts of the wear parts, use long time easy to stretch, some tensioning wheel can be automatic tensioning, in addition to the tensioning wheel run more smoothly, less noise, and can prevent slipping. Tensioning wheel of the synchronous belt is the tightness of the general use of synchronous belt instead, so as to avoid worries. Other parts do not have to, as long as the regular maintenance can be, but the oil must be often, the general driving distance of four or five thousand kilometers or more should be.

Tensioner wheel parts usually use synchronous belt to avoid worries. Other parts are not needed. Just go for regular maintenance. The oil must be often, generally 4000 ~ 5000 kilometers to. The structure and principle of the automobile tensioning wheel and resistance, in the actual use of the tensioning wheel, in order to maintain proper tension, avoid slippage, compensate for wear and aging due to elongation, need a certain. Tightening wheel in operation, the movement may cause vibration in the tightening wheel, causing and tightening wheel premature wear. For this reason, a resistance mechanism is added to the tensioner. But there are many parameters affecting the torque and resistance of the tightening wheel, and the influence of each parameter is not the same, so the relationship between the various components of the automobile tightening wheel and the torque and resistance is very complex. The change of torque directly affects the change of resistance, which is the main factor affecting the resistance, while the main factor of torque is the parameter. Appropriate reduction of the center diameter of the spring can improve the resistance value of the tensioning wheel. The main purpose of the tension wheel bearing is to support the mechanical rotating body, reduce the friction coefficient during its movement, ensure its rotational accuracy, and change the sliding friction to rolling friction.