Vacuum pump production process

Lleyam technology applied vacuum pump production process Gu Yi Xu (Suqian Jieli Environmental Protection Equipment Manufacturing Co., Ltd., Liyang, Jiangsu 223600) and other failures, mainly due to the vacuum pump design accuracy, parts processing methods and assembly procedures are not correct, In order to solve these problems, the processing methods and installation procedures of some main components of the vacuum pump are systematically described. The main contents are as follows: 1) Overview and production and use background of vacuum pumps; 2) Selection of manufacturing precision of main components of vacuum pumps; 3) Selection and application of process methods for the main components of the vacuum pump; 4) Conclusions and results of use.

1 Introduction and Production and Use of Vacuum Pumps The L240XW Sewage Pump manufactured by our plant has passed the provincial appraisal in March 2008 and has further improved its product quality, product output, and product standardization. And process methods are constantly improving and improving.

The sewage suction trucks produced by our factory are mainly composed of main components such as automobile chassis, sewage suction tank body, automatic fuse, automatic suction and discharge mechanism, oil and gas separator, and vacuum pump.

The vacuum pump that is equipped with the sewage suction truck is in accordance with the state regulations. All vacuum pumps that are equipped with suction equipment must have qualified manufacturers to provide qualified products. At that time, we were the vacuum pump supplied by Nanjing Chenguang Machinery Co., Ltd., and were installed in the process of use. -2.5m3 is used on the sewer truck and the user's reflection effect is very good; but when used in a sewer truck with 3 - 4m3, it causes a series of problems, such as: 1) heat, high temperature far exceeds the national standard The specified temperature rise 2 The selection of vacuum pumps' main components The manufacturing accuracy of vacuum pumps consists mainly of housings, side covers, pump cores, vanes, bearings, oil seal seats, oil seals, paper mats, end caps, cover caps, keys, and pump cores. It consists of a rotor, a spindle, and keys. As shown.

The original materials of the professional manufacturers are still maintained in the parts materials, that is, the HT250 common castings are used for the housing, side cover, end cover, cover, and rotor, and the common medium carbon steel is used for the main shaft and oil seal seat. The bearings are manufactured by Harbin Bearing Co., Ltd. GB standard bearings. In order to reduce the deformation of the blades and the wear resistance of the strong blades, the service life is changed to a compressed version of bakelite with copper reinforcement and nylon reinforcement.

2.2 Selection of main parts manufacturing accuracy According to the vacuum degree of the vacuum pump, the suction and discharge time of different capacity sewage suction vehicles and the thermal viscosity parameters of ordinary 16 diesel, the overall size of the vacuum pump and the space between the rotor and the shell and the side cover are calculated. Volume and clearance and eccentricity, namely: shell bore 舛75: °, length l = 2455, rotor outer diameter 48: °, length to clearance is 0.1 ± 0.03, 3 process selection and application of the pump core from the spindle, rotor , Flat key assembly, this component relates to the overall quality of the vacuum pump, if the spindle or rotor produces uneven or uneven rotor density, resulting in unbalanced phenomena, it will lead to uneven wear caused uneven blade or bearing load is not uniform Damaged parts cause oil leakage and even directly affect the vacuum suction. If the spindle and rotor are assembled incorrectly, over-tightening will generate excessive interference, which will easily cause damage to the rotor's crystalline phase and even cause the rotor to crack. When the shaft is too loose, It will directly affect the working of the vacuum pump because the serial axis will cause failure during the work process. Therefore, how to select the optimal process method to achieve the design technical parameters is Key, we factory according to the conventional production conditions and the pump core part selection for the following processing methods to ensure conformity of the pump core.

3.1.1 Spindle. In the sawing bed, the light end of the ordinary lathe hit the center hole, the car clamping position, turn the head to hit the other end of the center hole; then the roughing machine, in the technical application of C6140 ordinary lathe clamped at the other end with an active thimble tightly, select YT5 cemented carbide 90° primary offset tooling, cutting volume V=60m/min, S=0.2mm/n, t=1.5-3mm, radial size 2mm margin; quenching and processing HRC35-38; The center hole on the lathe is corrected and fixed on the ordinary lathe or on the CNC lathe with a heart-neck chuck, and the other end is tightly closed with an active thimble and is processed to a dimensional accuracy of 999l. 8299919, choose YT30 cemented carbide 90° master knife, cutting speed on the bed 2-8 ± 0.012 keyway. As shown.

3.1.2 Rotor. Check whether the casting has surface defects, material density, and material quality to meet the strength requirements of HT250. In the ordinary C6140, process the face car clamping position, turn the head and clamp the hole to the circle as the principle, and then use the movable thimble to locate the top hole tightly. ,Rough wheel outer circle with YG6 cemented carbide 90 ° positive and negative partial knife, cutting amount to the drawing requirements are reserved 1.5-2mm allowance, processing in the boring machine, broaching on the pull bed keyway 8±0.012. Show.

In the ordinary C620 lathe, the inner surface of the roughing hole and the end face, the flat car face and the roundness of the end face are 0 172, and the YG6 carbide 90° positive and negative offset boring tool and pointed boring tool are used to process the bottom plane and the intake and exhaust holes on the bed. The outer plane is up to the drawing size requirements. The Z50 radial arm drill is positioned with the bottom plane to expand the 046 exhaust port. The 046 hole center and plane are positioned. After adjusting the angle of the drill press and the moving position, the 046 intake holes are expanded to the bottom plane and row. Positioning of the blowholes on CNC lathes with 9199991 and one end plane, ensuring the end face to the center 122 of the exhaust hole, selecting the 90° master knife and 90° boring knife for YG8 or W30, cutting amount: V=60m/min, S= 0.08mm/n,t=0.3mm. To ensure the inner hole to turn around, use the drill hole and vent hole to drill and position all tapped holes, oil holes, positioning holes and tapping holes on the two ends. Position the tapped hole in the intake and exhaust and tap it. As shown.

3.1.3 Pump Assembly. On the workbench, place the rotor on the tooling of the workbench. The upper notch of the keyway is downward, and the key is mounted on the spindle. The spindle is first moved in parallel so that the axle head enters the inner hole of the rotor, and the first key is made. Align the keyway, allow it to pass, continue to advance, when the latter key reaches the keyway quickly, and then further approve the position of the key and the slot, then use the simple tool to push the spindle forward from one end to push it into the slot. Until the installation position is reached.

3.1.4 pump core processing. The pump core is installed on an ordinary lathe or a CNC lathe, one end is clamped with a heart-shaped chuck, and the other end is closed with a movable thimbles. Manually or programmatically controls the processing. Factory 0, private worker, 249=, private 8 2-3, etc. To size requirements, select the cemented carbide 90° positive and negative side of YT30 or W30, the cutting speed of the alloy 90° positive and negative partial cutting, cutting amount: V = 70m/min, S = 0.12mm/n, t = 0.3mm . Machine 6-99964 six vane slots with a CNC milling machine or EDM cutter. As shown.

All tools are machined and clamped for machining of each track size. When roughing, YG6 or W15 cemented carbide 90° main and 90° boring tools are selected. Cutting amount: Alloy 90° primary and 90° bore Knife, cutting amount: V = 75m/min, S = 0.12mm/n, t = 0-2mm, drill hole with a special drill hole positioning processing.

On the power saw, the mold is used for blanking, and the width of the strip is cut to 245±1 with a sheet of 1m×2m, and then cut into 50±1 blanks. The disk saw is used as a cutting tool, and the grinding wheel is taken as 0200X032X53. SiC material. Milling both sides, both ends, and notching on the milling machine, the milling cutter uses W18MnCr4V polygonal edge end mill, lubricates and dusts with 10% emulsion, and grinds the plane of thickness on the surface grinder.

The assembly of the vacuum pump is performed on a special workbench, and the pump core, the housing, the side cover, the blade, the oil seal seat, the oil seal, the bearing, the end cover, the cover, the paper pad, the butter, the bolt, and the tool are prepared. The parts are placed in gasoline and cleaned and blow dried. Then apply mechanical oil on the surface of the blade and inject grease into the bearing. After the preparation is completed, start the assembly. Place the grease-injected bearings on both sides of the cover and apply one of the greased side covers to the surface of the pump according to the rotation direction of the pump. Insert the long end of the pump shaft, add the paper pad hole to tightly press and compact, put the shell upright on the assembly frame, slowly put the pump core with the side cover into the shell to adjust the eccentric position ( After fixing the position with the positioning pin, fix the side cover to the housing with screws, tighten the screws equally and tighten them step by step. Turn the head upright and place it vertically to clamp the position of the oil seal seat of the main shaft to see if the housing rotation is flexible. The oil-coated leaves are placed into the groove of the pump core in an up-and-down motion freely, and the housing is rotated to see the eccentric clearance of the housing. The oil seal seat and the oil seal are fitted in the same way, and the cover and the belt pulley are tightened to tighten the bolt. The mounted vacuum pump is installed on the test bench for pressure test. The requirements are as follows: speed n=1100n/min, working time 0.08Mpa, actual measurement n=1160n/min, sealing the air inlet and operating temperature for 50min continuously. 38C, vacuum pressure value is -0.09Mpa. High-tech industry development VAHEL application, reduce the duration of the attack process, and ensure the safety of the aircraft, the future space-free anti-radiation missile will further increase the attack speed and large range.

At present, the radome of anti-radiation missiles can achieve 20 GHz bandwidth. However, due to the insufficient strength of this material, the speed of the missile was limited. In the future, more desirable composite materials will be explored and studied to meet the bandwidth while improving the structural strength. Therefore, the use of high-performance engines and new composite radome is one of the main ways to achieve the above goals. 3) The strong warheads lethality. The use of a more powerful warhead and a more advanced and reliable war-fighting system will remain a development direction for future air-ground anti-radiation missiles. This can make up for the lack of guidance accuracy, especially when attacking a ground radar target with a large amount of missed shots and a strong missile kill effect. 4) Use stealth technology to improve concealment. Modern advanced air defense radars have adopted anti-radiation missile countermeasures. In the future, space-free anti-radiation missiles will generally adopt stealth technology in order to increase their attack success rate. This includes the use of invisible shapes and microwave absorbing coatings, as well as the use of low smoke or smokeless fuel, low infrared radiation engines, etc., making it difficult for enemy radar to detect and identify. 5) Fuze coordination technology. With the improvement of countermeasures against anti-radiation missiles, the probability of damage to the end of anti-radiation missiles has been challenged. For example, placing a radar antenna on a high platform increases the difficulty of triggering the fuse. In order to better play its role, it is necessary to further improve the technology of warhead cooperation.

3 The development trend of future anti-radiation missiles Along with the rapid development of future weapons systems and the complications of the battlefield confrontation model, such as the United States’ space-space integrated combat mode, the development of space-based or near-orbit-based space-based weapon systems, and the development of future anti-radiation missiles. Mainly reflected in the following aspects.

1) Multipurpose, multitasking. Multi-purpose missiles are the development direction of future weapons. In order to meet operational needs and reduce costs, the development of anti-radiation missiles in the future should be developed in the direction of a multi-purpose joint missile. In other words, the missile not only has good anti-radiation strike capability, but also has the ability to actively seek various targets such as combat aircraft, bombers and ships. Multi-task missiles can adapt to changing conditions on the battlefield, can flexibly fight against various targets, do not need to pre-analyze the types of carrier bombs, not only improve the operational efficiency of the vehicle and the ease of logistics, but also reduce the risk. At present, all major military powers have upgraded their existing anti-radiation missiles and have developed multi-mode composite seekers. For example, the Azerbaijan Research Institute of Russia showed a 9B-1103M-200PS dual-mode seeker with passive/active radar, which is said to be effective against the enemy's early warning aircraft. Its passive antenna allows the seeker to reach distances of several hundred kilometers in passive mode. If the pre-warning agency loses its surveillance radar, the missile relies on active mode to track the target. Russia's newly developed multiple types of air-to-air missiles also have the function of anti-radiation missiles. The multi-mode compound seeker has both the ability to actively seek and passively seek, and it can deal with targets with radiation sources, such as early-warning machines, radar detection equipment, etc. It can also deal with various targets with low radar radiation. In the future, anti-radiation missiles can be developed into multi-purpose weapons systems with anti-ship, anti-tank, and even anti-submarine capabilities. 2) The diversification of launch platforms. Future anti-radiation missiles can not only be launched from carrier platforms, but also can be adapted to other platform launches, from space-based launches to land-based fixed/mobile launches, sea-based launches and even space-based launches. The adaptability of multiple launch platforms widens the application environment of anti-radiation missiles, improves the survivability of weapon systems, and retains the ability to counterattack twice. If an anti-radiation missile can be launched from a spacecraft, it will be unimaginable. For example, it can be used to combat various targets such as satellites and space stations of the enemy. 3) Integration of air, space and land. The integration of space, space and the earth is the development trend of future wars. The air-to-air aircraft project being developed by Boeing of the United States is the breakthrough point for the United States to enter the integrated combat mode of space, air, and earth. It can be imagined that in the future we will face not only the threat of the aircraft below 30,000 meters, but also the three-dimensional precision assault from the outer sky vehicle. In response to this passive situation, China will also develop its own space-to-land integrated strike weapon system. Of course, conventional anti-radiation missiles have been unable to meet the requirements of operational conditions. In the future, anti-radiation missiles should have stronger cruising capabilities and surprise attacks. The speed can be easily shuttled inside and outside the atmosphere, enabling fine detection and pre-positioning. Not only that, the integration of space and space in the future battlefield requires that anti-radiation missiles should have the ability to identify with one another and be able to exchange information and share information with other missiles and weapon platforms.

This paper analyzes the technical characteristics and existing problems of the three generations of anti-radiation missiles, and points out the key technologies that the anti-radiation missiles need to solve, such as overcoming the seeker guidance accuracy, flight speed, strike range, anti-jamming capability, and fuze coordination issues. Then according to the changes of future combat modes, it is proposed that anti-radiation missiles should also develop toward the multi-task capability, the adaptability of multi-emission platforms and the integration of space, space, and earth.

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