CN204553315U - A kind of horizontal middle open type double-volute multistage centrifugal pump - Google Patents

Abstract

The utility model belongs to fluid conveying machine technical field, is specifically related to horizontal middle open type double-volute multistage centrifugal pump, is applicable to petrochemical plant, coal chemical engineering equipment and pipeline conveying etc.Each impeller of this device and axle are interference fit, and axle is respectively equipped with the impeller snap ring to each impeller axially locating, the internal surface of nockbush is provided with meshed grooves.The utility model structure is simple, and reasonable in design, generalization degree is higher, and the cumulative error of integral rotor is little, long service life, and axial seal is good, operates steadily, bearing long service life.

Description

A horizontal split double volute multistage centrifugal pump

technical field

The utility model belongs to the technical field of fluid conveying machinery, in particular to a horizontal split double volute multistage centrifugal pump.

Background technique

The shaft sleeve positioning is generally used between the impeller and the impeller of the existing split double volute multistage centrifugal pump, so it cannot meet the requirements of the relevant standards; at the same time, due to the increase of the matching surface of the structure, the cumulative error is large, It is not conducive to the adjustment of the tolerance of the rotor shape and position; in addition, the sliding fit of the throttle bushing and the throttle bushing is a smooth surface, and the axial sealing performance is not ideal, which also affects the working efficiency of the pump.

Contents of the invention

The utility model improves on the above-mentioned existing technical problems, and provides an improved horizontal split double volute multistage centrifugal pump, which has a compact structure, beautiful appearance, high efficiency and energy saving, safety and environmental protection, and convenient maintenance.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: each impeller and the shaft are interference fit, and the shaft is respectively provided with an impeller snap ring for axial positioning of each impeller, and each impeller is independently axially positioned, The cumulative error of the whole rotor can be greatly reduced.

The inner surface of the throttling bush of the multi-stage centrifugal pump is provided with mesh grooves, forming evenly distributed bumps, which not only facilitates the lubrication of the sliding fit and improves the service life, but also improves the axial sealing performance and reduces the Axial backflow improves the working efficiency of the pump.

The driving end bearing of the pump adopts one row of cylindrical roller bearings, and the non-driving end bearing adopts two rows of angular contact ball bearings. This arrangement makes the positioning of the pump reliable, the operation stable and free of axial movement. There is a water cooling chamber below the lubricating oil chamber of the bearing body. The inlet and outlet of the water cooling chamber are respectively connected to the cooling water inlet joint and the cooling water outlet joint, which can more effectively reduce the oil temperature in the lubricating oil chamber of the bearing body and improve the bearing capacity. service life.

The impellers on the shaft of the multistage centrifugal pump are arranged back to back, which can balance the axial force generated during work.

1. The impellers are arranged back to back to balance the axial force by themselves.

2. Each impeller and the shaft are interference fit, which adopts shrink fitting and individual axial positioning, and the cumulative error of the overall rotor is small.

3. The throttling bush is provided with mesh grooves to form evenly distributed bumps, which is not only beneficial to the lubrication of the sliding fit and prolongs the service life, but also improves the axial sealing performance, reduces the backflow of the medium along the axial direction, and improves the performance of the pump. work efficiency.

4. The angular contact ball bearings are installed in pairs to bear the axial force evenly, and the cylindrical roller ball bearings are used to bear the radial force, so that the positioning of the pump is reliable, the operation is stable and there is no axial movement.

5. A water cooling chamber is added outside the lubricating oil chamber of the bearing body to effectively reduce the temperature of the lubricating oil and increase the service life of the bearing.

Description of drawings

Below in conjunction with accompanying drawing and implementation the utility model is described further.

Fig. 1 is the structural representation of the utility model.

Figure 2 is the left side view of Figure 1.

Figure 3 is an enlarged view of the position of the impeller fixing snap ring.

Figure 4 is an enlarged view of the position of the throttling bush.

In the figure: 1. Upper pump body, 2. Lower pump body, 3. First stage casing seal ring, 4. Front impeller seal ring, 5. Impeller snap ring, 6. Interstage bushing, 7. Rear impeller seal ring , 8. Intermediate bushing, 9. Intermediate shaft sleeve, 10. Intermediate wear-resistant bushing, 11. Impeller, 12. Throttle bushing, 13. Mechanical seal, 14. Throttle sleeve, 15. Shaft, 16. Drive end bearing body, 17. Non-drive end bearing body, 18. Locating pin shaft, 19. Balance tube.

Detailed ways

The utility model is further described in detail in conjunction with the accompanying drawings.

As shown in Figure 1, the multistage centrifugal pump includes an upper pump body 1, a lower pump body 2, a shaft 15, an impeller 11, a driving end bearing body 16, and a non-driving end bearing body 17. The impeller 11 is placed in the pump body, and the impeller 11 It is an interference fit with the shaft 15, and is axially positioned independently by the impeller snap ring 5 (see Figure 3 for details), which reduces the shape and position tolerance of the entire rotor caused by the shape and position tolerance of the shaft sleeve when other pumps use the shaft sleeve for positioning Very bad. The impeller 11 is equipped with a plurality of series combinations to form a step-by-step booster. The arrangement direction of the left half and the right half of the impeller 11 is opposite (that is, arranged back to back), and the axial force is balanced by itself; the front impeller seal ring 4 of the impeller and the rear impeller The impeller sealing ring 7 is slidingly fitted between the corresponding housing sealing rings, and an intermediate wear-resistant bushing 10 and an intermediate shaft sleeve 9 are provided in the middle of the left and right impellers, and the two are slidingly fitted; in the high pressure area of the pump On the driving end side, there are respectively provided with a throttle bushing 12 and a throttle bushing 14 for sliding fit, and the inner surface of the throttle bushing 12 is provided with reticular grooves, forming evenly distributed bumps (see Figure 4 for details) , The sealing effect is better, and it can prevent leakage more effectively. The two ends of the pump body connected to the shaft 5 are provided with a mechanical seal 13, and the two ends of the shaft 15 protruding from the pump body are respectively installed with a driving end bearing body 16 and a non-driving end bearing body 17, and the shaft end extending out of the driving end bearing body Connected with the output shaft of the motor, the power drives the impeller 11 to rotate through the shaft 15, so as to achieve the purpose of conveying the medium.

As shown in FIG. 3 , each impeller is individually fixed by means of an impeller snap ring 5 .

As shown in FIG. 4 , the throttling bush 12 and the throttling sleeve 14 that are slidingly fitted are characterized in that the inner surface of the throttling bush 12 is provided with reticular grooves to form evenly distributed bumps.

Claims (4)

1. a horizontal middle open type double-volute multistage centrifugal pump, is characterized in that: each impeller and axle are interference fit, axle is respectively equipped with the impeller snap ring to each impeller axially locating.

2., by horizontal middle open type double-volute multistage centrifugal pump according to claim 1, it is characterized in that: the internal surface of nockbush is provided with meshed grooves.

3. by horizontal middle open type double-volute multistage centrifugal pump according to claim 2, it is characterized in that: pump drive end bearing adopts columna roller bearing, non-driven-end bearing adopts two row angular contact ball bearings, be provided with water cooling chamber in the below of bearing support lubricant reservoir, the inlet/outlet in water cooling chamber connects cooling water intake joint and coolant outlet joint respectively.

4., by horizontal middle open type double-volute multistage centrifugal pump according to claim 2, it is characterized in that: the impeller on axle is back-to-back layout.