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Special mechanical seal cooling water pump diesel locomotive Development


Seal. These are limitations of the mechanical seal to follow the performance of floating ring, a strong vibration in locomotive prone to leaks, to make the sealing reliability of the instability, that sail here, kind of mechanical seals used in the structure of the locomotive is not reliable. 3. Special mechanical seal pumps locomotive selected above analysis revealed that the mechanical seal pumps should be improved locomotive design and development. Particular requirements for the locomotive. (Eagle 3) 5EX9R, special mechanical seal design idea is: trying to run the vibration of the pump must circle locomotive strong reliability problems when the brand-shot, no shaft wear and maintenance can only dismantle, low cost, should be mass production. Design points are: from structure to solve the floating ring of Q dolphins follow the above points and design ideas, through a variety of other structural analysis and comparison of mechanical seal and screened to select the two structural forms: one is the DB type (see Figure 4), the other is the ND4 type (see Figure 5), as a reference for the new structure. Both structures are rubber bellows mechanical seal. Their structural characteristics are: ring assembly with rubber bellows overall short form, structure, lightweight, easy to install overhaul, axial positioning is correct. Metal structure with sheet metal forming, low manufacturing cost, should be mass production. Spring with conical springs, bellows to give it and end the pressing force (pressure ratio), in the face wear can promote the ring when the compensation to ensure the face tightly. Activity 'eagle put solid ring, bellows, push the ring, springs, etc. into a whole through the sealing ring seal component, so that compact. Rubber bellows in the structure has three functions, one to face the pressing force to ensure tight fitting face; the second is to transmit torque, so that ring for relative rotation to complete the seal; Third, through the spring seat and shaft Lu from the shaft seal, and no slip at work, is a static seal. Shaft sealing parts (and henchmen drive, hook spring drive ~., ASEX structure compared to the shaft seal parts) away from (ie, backward) sealing surface, which can enhance and improve the floating ring to follow the performance, with good reduction vibration, thus solving the floating of the ring have a big problem. This is where the advantages of bellows seal. Which makes it suitable for 10 'Carbon' should be a strong vibration in locomotive operation vibrations when the shaft is still reliable and sealed to meet on the axis does not wear the special requirements. From a structural point of view, DB type (see Figure 4) of the structure more complex shapes, and three stamping parts stamping die to be 11 sets, two sets of rubber molds to be 2, totaling 13 sets of molds. The ND4 model (see Figure 5) of the structure shape is relatively simple, only three stamping parts stamping die 8 sets, 2 sets required two pieces of rubber molds, totaling 1O sets of molds. Contrast that, ND4 type 3 sets of stamping dies and the structure less simple shape, mold making convenient, low cost, so the priority should use ND4-type structure. However,[link widoczny dla zalogowanych], ND4-type structure is also inadequate. First of all, ND4 stationary ring-type components, and its diameter larger than the largest diameter ring components,[link widoczny dla zalogowanych], not suitable for domestic locomotive water pump assembly, and the second step is the static ring-shaped cross-section,[link widoczny dla zalogowanych], the third is the \\To this end, the stationary ring assembly to DB-type structure, that is to improve the structure of the pump assembly suitable for domestic use in the form of locomotive. Taking into account the structural strength of the pump cover, outer diameter of the stationary ring components to less than the maximum outer diameter of ring components, the step-shaped cross-section to rectangular stationary ring, the \chamfer to facilitate installation. The improved structure of the static ring component is more reasonable. In addition, the rubber bellows spherical to conical, to make the rubber mold making simple,[link widoczny dla zalogowanych], improved bellows does not affect the function, but reduced the purchase price. The improved design of the locomotive water pump dedicated machine 1993 (2) (Fig. 6) ND. (Figure 6) mechanical seal structure shown in Figure 6. 4. The newly developed special mechanical seals pump locomotive effect of the implementation of improvement measures in the next, a water pump for domestic motorcycle use special mechanical seal assembly design already completed. And then carefully design calculations, even if the size of each part determined. If well designed, one can also use the other two stamping parts stamping parts punching the punching more than expected, saving sheet metal, again reducing manufacturing costs. The advanced mechanical seal technology,[link widoczny dla zalogowanych], reasonable structure, excellent performance, improved following the performance of floating ring and has a vibration damping. It is a strong vibration in locomotive that remain stable and reliable sealing, assembly and disassembly easy maintenance and does not wear axis. Locomotive running by using the user authentication, the use of leakage-free, reliable seal, which replaces the domestic motorcycle use other mechanical seal. This not only solves the problem of domestic locomotive water pump seal and reduce the frequency of locomotive temporary repair, improve rail capacity, better social and economic benefits.
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