CN209892456U

CN209892456U - High-efficient double suction centrifugal pump

Info

Publication number: CN209892456U
Application number: CN201920832333.9U
Authority: CN
Inventors: 王业春; 孟海建
Original assignee: Shanghai Tongke Flow Technology Co Ltd
Current assignee: Shanghai Tongke Flow Technology Co Ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2020-01-03
Anticipated expiration: 2029-06-04

Abstract

The utility model discloses a high-efficient double entry centrifugal pump, including last pump case, lower pump case, impeller, axle sleeve, key, machine seal gland and mechanical seal, go up the pump case and constitute the pump body with lower pump case jointly, the impeller passes through the key to be fixed at the middle part of axle, the both ends of axle all are connected with last pump case and lower pump case rotation through bearing body part and bearing, the both ends of axle sleeve all are fixed with the baffle through the axle sleeve nut, be equipped with the second sealing washer between baffle and the impeller, go up the position department that pump case and lower pump case are close to the impeller and install sealing ring and first sealing washer. The double suction centrifugal pump of this scheme has carried out the improved design in the aspects such as the cooperation of the pump body and impeller, the structure of sealing ring, the structure of bearing body, has improved the efficiency of pump, improves the installation maintenance efficiency of pump, has reduced use cost for the customer.

Description

High-efficient double suction centrifugal pump

Technical Field

The utility model relates to a double entry pump technical field especially relates to a high-efficient double entry centrifugal pump.

Background

The double suction pump has the advantages of large flow, high lift, large parameter range, bearing support at two ends, reasonable and stable structure of the impeller, large application of the double suction pump in important occasions requiring a large amount of water, such as steel plants, power plants, water plants and the like, large motor power, large application amount, upgrading and improving the double suction pump, improvement of the operating efficiency of the water pump, use reliability and convenience of maintenance, reduction of use cost for customers, reduction of maintenance cost and great significance.

In the prior art, the following disadvantages still exist in the practical use process of the double-suction pump: the suction chamber of the pump body is structurally structured, liquid in the suction chamber needs to turn for many times to cause unstable flow, suction of an impeller inlet is influenced, bubbles can be generated, a large amount of prerotation can be generated, and energy is consumed; the double-suction pump is usually connected with the lower pump shell because of the structural characteristics, so that the upper part of the bearing body is not fixed with the pump body, slight shake exists during operation, and particularly for large bearings, the diameter of the bearing body is large, the upper part of the bearing body is not fixed, the shake is obvious, the service life of the bearing is influenced, and the use effect is influenced; the matching part of the sealing ring and the pump shell is in clearance fit, and has a clearance, high-pressure water of the pump shell can flow to the low-pressure side through the clearance, flow and wash for a long time, and can destroy the matching, destroy the pump shell and the mouth ring, increase the maintenance cost, flow at high pressure and low pressure, increase the leakage rate and reduce the lift; improvements are needed to address the above issues.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a high-efficiency double-suction centrifugal pump.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a high-efficiency double-suction centrifugal pump comprises an upper pump shell, a lower pump shell, an impeller, a shaft sleeve, a key, a mechanical seal gland and a mechanical seal, wherein the upper pump shell and the lower pump shell jointly form a pump body, the impeller is fixed in the middle of the shaft through the key, two ends of the shaft are rotatably connected with the upper pump shell and the lower pump shell through a bearing body part and a bearing, two ends of the shaft sleeve are respectively fixed with a baffle through a shaft sleeve nut, a second seal ring is arranged between the baffle and the impeller, and a seal ring and a first seal ring are arranged at the positions, close to the impeller, of the upper pump shell and the lower pump.

Preferably, a gap exists between the impeller and the upper pump shell and between the impeller and the lower pump shell, and the width of the gap is 2-5 mm.

Preferably, a spacer rib is installed in the middle of the suction chamber of the pump body.

Preferably, the bearing body part comprises two bearing bodies which are symmetrical to each other, the two bearing bodies are fixed to each other through a positioning pin and a second fixing bolt, and the two bearing bodies are respectively fixedly installed on the upper pump shell and the lower pump shell through a first fixing bolt and a fixing plate.

Preferably, a baffle is installed in the suction chamber of the pump body, the baffle is fixed with the first sealing ring, and the baffle covers the upper side of the cover plate of the impeller.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the impeller and the pump shell are tightly matched, the pump efficiency is improved, the sealing is increased, the leakage amount is reduced, the pump efficiency is improved, and the centering performance of a flow passage is ensured.

2. The first sealing ring is additionally arranged at the matching position of the sealing ring and the pump shell, so that high-low pressure flow is eliminated, the efficiency of the pump is improved, and the use reliability is improved.

3. A baffle is added near the inlet of the impeller; thus, the high-pressure water leaked from the impeller opening ring returns to the impeller inlet, the pressure at the inlet is improved, the generation of cavitation bubbles is damaged, and the efficiency of the pump is improved.

4. The middle of the suction chamber of the pump body is provided with a spacer rib; the double suction pump has the advantages that due to the structure, liquid in the suction chamber needs to turn for many times to cause unstable flow, suction at the inlet of the impeller is affected, bubbles can be generated, a large amount of prerotation can be generated, energy is consumed, and after the partition ribs are added to the suction chamber, the liquid flows uniformly and stably, so that the efficiency of the pump can be improved.

5. The bearing body part is characterized in that the lower side of the bearing body is connected with the lower pump shell, the upper side of the bearing body is connected with the upper pump shell, the pump runs more reliably and stably due to the structural design, the bearing body is split up from top to bottom, and when the bearing is maintained and replaced, the bearing can be taken out completely and easily only by detaching the positioning pin and the second fixing bolt.

In conclusion, the double-suction centrifugal pump of the scheme has the advantages that the improved design is carried out on the aspects of the matching of the pump body and the impeller, the structure of the sealing ring, the structure of the bearing body and the like, the efficiency of the pump is improved, the installation and maintenance efficiency of the pump is improved, and the use cost is reduced for customers.

Drawings

Fig. 1 is a schematic view of the overall structure of a high-efficiency double-suction centrifugal pump according to the present invention;

FIG. 2 is a side view of a high efficiency double suction centrifugal pump according to the present invention;

fig. 3 is a schematic structural diagram of a bearing body component of the high-efficiency double-suction centrifugal pump provided by the utility model;

FIG. 4 is an enlarged view of the structure of part A of the high-efficiency double-suction centrifugal pump of the present invention;

FIG. 5 is a schematic view of the water flow pattern of a prior art suction chamber;

fig. 6 is a schematic view of the water flow pattern of the suction chamber of the present invention.

In the figure: the mechanical seal structure comprises a bearing body part 1, a mechanical seal gland 2, a mechanical seal 3, an upper pump shell 4, a seal ring 5, a first seal ring 6, an impeller 7, a key 8, a second seal ring 9, a shaft 10, a shaft sleeve 11, a shaft sleeve 12, a shaft sleeve nut 13, a baffle plate 14, a lower pump shell 14, a first fixing bolt 15, a fixing plate 16, a spacing rib 17, a positioning pin 18 and a second fixing bolt 19.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element indicated must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention.

Referring to fig. 1-6, a high-efficient double suction centrifugal pump, including upper pump case 4, lower pump case 14, impeller 7, axle 10, axle sleeve 11, key 8, mechanical seal gland and mechanical seal, characterized in that, upper pump case 4 and lower pump case 14 constitute the pump body jointly, impeller 7 passes through key 8 to be fixed in the middle part of axle 10, the both ends of axle 10 all rotate with upper pump case 4 and lower pump case 14 through bearing body part 1 and bearing and are connected, the both ends of axle sleeve 11 are all fixed with baffle 13 through axle sleeve nut 12, be equipped with second sealing washer 9 between baffle 13 and the impeller 7, upper pump case 4 and lower pump case 14 are close to impeller 7's position department and are installed sealing ring 5 and first sealing washer 6.

A gap exists between the impeller 7 and the upper pump shell 4 and the lower pump shell 14, and the width of the gap is 2-5 mm.

The middle of the suction chamber of the pump body is provided with a spacer rib 17.

The bearing body part 1 comprises two bearing bodies which are symmetrical to each other, the two bearing bodies are fixed to each other through a positioning pin 18 and a second fixing bolt 19, and the two bearing bodies are fixedly installed on the upper pump shell 4 and the lower pump shell 14 through a first fixing bolt 15 and a fixing plate 16 respectively.

A baffle 13 is arranged in the suction chamber of the pump body, the baffle 13 is fixed with the first sealing ring 6, and the baffle 13 covers the upper side of the cover plate of the impeller 7.

The utility model discloses in, impeller 7 and last pump case 4 and lower pump case 14 cooperation are inseparable, improve pump efficiency, increase sealedly, reduce leakage quantity, improve the efficiency of pump, guarantee the runner centering nature.

The first sealing ring 6 is added at the matching part of the sealing ring 5 and the upper pump shell 4 and the lower pump shell 14, so that the flow of high pressure and low pressure is eliminated, the efficiency of the pump is improved, and the use reliability is improved.

A baffle 13 is added near the inlet of the impeller 7; thus, the high-pressure water leaked from the opening ring of the impeller 7 returns to the inlet of the impeller 7, the pressure at the inlet is improved, the generation of cavitation bubbles is damaged, and the efficiency of the pump is improved.

The middle of the suction chamber of the pump body is added with a spacer rib 17; due to the structure of the double-suction pump, liquid in the suction chamber needs to turn for many times to cause unstable flow, suction at the inlet of the impeller 7 is affected, bubbles can be generated, a large amount of prerotation can be generated, energy is consumed, and after the partition ribs 17 are added in the suction chamber, the liquid flows uniformly and stably, so that the efficiency of the pump can be improved.

The bearing body part 1 is characterized in that the lower side of the bearing body is connected with the lower pump shell 14, the upper side of the bearing body is connected with the upper pump shell 4, the pump runs more reliably and stably, the bearing body is split up from top to bottom, when the bearing is maintained and replaced, only the positioning pin and the second fixing bolt 19 need to be disassembled, and the bearing can be taken out completely and easily.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a high-efficient double entry centrifugal pump, includes upper pump case (4), lower pump case (14), impeller (7), axle (10), axle sleeve (11), key (8), mechanical seal gland and mechanical seal, its characterized in that, upper pump case (4) constitutes the pump body with lower pump case (14) jointly, impeller (7) are fixed in the middle part of axle (10) through key (8), the both ends of axle (10) are all through bearing body part (1) and bearing and upper pump case (4) and lower pump case (14) rotation connection, the both ends of axle sleeve (11) are all fixed with baffle (13) through axle sleeve nut (12), be equipped with second sealing washer (9) between baffle (13) and impeller (7), go up pump case (4) and lower pump case (14) and install sealing ring (5) and first sealing washer (6) near the position department of impeller (7).

2. A high-efficiency double suction centrifugal pump according to claim 1, characterized in that there is a gap between the impeller (7) and the upper (4) and lower (14) pump casings, the width of the gap being between 2-5 mm.

3. A high-efficiency double-suction centrifugal pump according to claim 1, wherein a spacer rib (17) is installed in the middle of the suction chamber of the pump body.

4. A high-efficiency double-suction centrifugal pump according to claim 1, characterized in that the bearing body part (1) comprises two symmetrical bearing bodies, the two bearing bodies are fixed with each other by a positioning pin (18) and a second fixing bolt (19), and the two bearing bodies are respectively fixed with the upper pump shell (4) and the lower pump shell (14) by a first fixing bolt (15) and a fixing plate (16).

5. A high-efficiency double-suction centrifugal pump according to claim 1, wherein a baffle (13) is installed in the suction chamber of the pump body, the baffle (13) is fixed with the first sealing ring (6), and the baffle (13) covers the upper side of the cover plate of the impeller (7).